CN110388719B - Central air conditioning unit and control method and device thereof - Google Patents

Abstract

The invention provides a central air conditioning unit and a control method and a control device thereof, wherein the method comprises the following steps: acquiring an operation state parameter of the central air conditioning unit, and judging whether the central air conditioning unit breaks down or not according to the operation state parameter; if the central air conditioning unit is judged to have a fault, generating a fault shutdown mark, and acquiring a corresponding preset automatic reset parameter according to the fault; and carrying out automatic reset control on the central air conditioning unit according to preset automatic reset parameters. Therefore, whether the central air conditioning unit breaks down or not is judged according to the running state parameters of the central air conditioning unit, a fault stop sign is generated when the central air conditioning unit breaks down is judged, and automatic reset control is carried out on the central air conditioning unit according to the fault and the preset automatic reset parameters, so that automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Description

Central air conditioning unit and control method and device thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to a control method of a central air conditioning unit, a control device of the central air conditioning unit and the central air conditioning unit.

Background

Large central air conditioners are generally used in the scenes of subways, airports, large manufacturing plants and commercial buildings, and the primary goal is to operate stably and reliably compared with efficient operation.

However, the problem of the related art is that the central air conditioner may be subjected to short-term operating condition changes during operation, such as voltage fluctuation and jamming of a slide valve inside the compressor, or a failure of a part of the compressors in a multi-compressor unit may cause a shutdown protection of the unit, i.e., stopping or reducing power supply, at which time the central air conditioner must be manually reset by a relevant person before being restarted, and the shutdown or loss of load due to uncertain power supply recovery time may cause a reduction in comfort of the central air conditioner, or even cause economic loss in a manufacturing plant with severe refrigeration requirements.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a method for controlling a central air conditioning unit, which can implement automatic reset and restart of the central air conditioning unit, and improve the stability and comfort of the central air conditioning unit.

The second purpose of the invention is to provide a control device of a central air conditioning unit.

The third purpose of the invention is to provide a central air conditioning unit.

In order to achieve the above object, a method for controlling a central air conditioning unit according to an embodiment of a first aspect of the present invention includes: acquiring an operation state parameter of a central air conditioning unit, and judging whether the central air conditioning unit breaks down or not according to the operation state parameter; if the central air conditioning unit is judged to have a fault, generating a fault shutdown mark, and acquiring a corresponding preset automatic reset parameter according to the fault; and carrying out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters.

According to the control method of the central air conditioning unit provided by the embodiment of the invention, the running state parameters of the central air conditioning unit are obtained, whether the central air conditioning unit breaks down or not is judged according to the running state parameters, a fault stop sign is generated when the central air conditioning unit breaks down is judged, the corresponding preset automatic reset parameters are obtained according to the faults, and further, the central air conditioning unit is subjected to automatic reset control according to the preset automatic reset parameters, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

In addition, the control method of the central air conditioning unit according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention, the central air conditioning unit comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a compressor, a condenser, an evaporator and a throttling device, and the second refrigerant circulation system comprises the evaporator and an indoor heat exchanger.

According to one embodiment of the invention, the operating state parameters include: the system parameters comprise the evaporation pressure of the evaporator, the condensation pressure of the condenser and the chilled water outlet temperature, and the compressor parameters comprise the exhaust pressure of the compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

According to one embodiment of the present invention, the preset automatic reset parameters include: presetting automatic reset enabling, presetting automatic reset times and presetting automatic reset allowable time.

According to an embodiment of the present invention, the determining whether the central air conditioning unit has a fault according to the operation state parameter includes: if any one of the condensing pressure of the condenser and the exhaust pressure of the compressor is larger than a preset high-pressure threshold value; or, any one of the evaporation pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the temperature of the outlet water of the chilled water is less than a preset low-temperature threshold; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

According to an embodiment of the present invention, the performing automatic reset control on the central air conditioning unit according to the preset automatic reset parameter includes: if the preset automatic reset enable is 0, maintaining the fault stop sign, sending fault information and controlling the central air conditioning unit to stop; if the preset automatic reset enable is 1, further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times; if the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, maintaining the fault stop sign, sending fault information and controlling the central air conditioning unit to stop; if the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time; if the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time, controlling the central air conditioning unit to automatically reset and restart; if the automatic reset time of the central air conditioning unit is longer than the preset automatic reset allowable time, the fault stop mark is kept, and fault information is sent out and the central air conditioning unit is controlled to stop.

According to an embodiment of the present invention, the controlling the central air conditioning unit to automatically reset and restart further includes: clearing the fault shutdown flag; and after judging that the central air-conditioning unit meets the automatic restarting condition, controlling the central air-conditioning unit to automatically reset and restart.

According to an embodiment of the present invention, the determining that the central air conditioning unit satisfies the automatic restart condition includes: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to a first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

According to one embodiment of the present invention, the control method includes: and dynamically adjusting the preset automatic reset parameters according to the operation parameters of the central air-conditioning unit, wherein the operation parameters of the central air-conditioning unit comprise unit operation load.

According to one embodiment of the invention, the compressor comprises a single compressor or a multi-compressor train; the method further comprises the following steps: and if the compressor is the multi-compressor unit and the multi-compressor unit fails to automatically reset and restart, controlling the central air-conditioning unit to stop.

In order to achieve the above object, a control device for a central air conditioning unit according to a second aspect of the present invention includes: the acquisition module is used for acquiring the running state parameters of the central air conditioning unit; the judging module is used for judging whether the central air conditioning unit breaks down or not according to the running state parameters; the generating module is used for generating a fault shutdown mark if the central air conditioning unit is judged to have a fault, and the acquiring module is also used for acquiring corresponding preset automatic reset parameters according to the fault; and the control module is used for carrying out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters.

According to the control device of the central air conditioning unit, the acquisition module is used for acquiring the running state parameters of the central air conditioning unit, the judgment module is used for judging whether the central air conditioning unit fails or not according to the running state parameters, the generation module is used for generating the fault stop sign after the central air conditioning unit is judged to fail, the acquisition module is used for acquiring the preset automatic reset parameters corresponding to the failure, and further the control module is used for carrying out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

In addition, the control device of the central air conditioning unit according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention, the central air conditioning unit comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a compressor, a condenser, an evaporator and a throttling device, and the second refrigerant circulation system comprises the evaporator and an indoor heat exchanger.

According to one embodiment of the invention, the operating state parameters include: the system parameters comprise the evaporation pressure of the evaporator, the condensation pressure of the condenser and the chilled water outlet temperature, and the compressor parameters comprise the exhaust pressure of the compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

According to one embodiment of the present invention, the preset automatic reset parameters include: presetting automatic reset enabling, presetting automatic reset times and presetting automatic reset allowable time.

According to an embodiment of the present invention, the determining module is further configured to determine whether any one of a condensing pressure of the condenser and an exhaust pressure of the compressor is greater than a preset high pressure threshold; or, any one of the evaporation pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the temperature of the outlet water of the chilled water is less than a preset low-temperature threshold; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

According to an embodiment of the invention, when the preset automatic reset enable is 0, the control module is further configured to maintain the fault stop flag, send fault information and control the central air conditioning unit to stop; when the preset automatic reset enable is 1, the judging module is further used for further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times; when the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, the control module is further used for keeping the fault stop mark, sending fault information and controlling the central air conditioning unit to stop; when the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, the judging module is also used for further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time; when the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset permission time, the control module is also used for controlling the automatic reset restart of the central air conditioning unit; and when the automatic reset time of the central air conditioning unit is longer than the preset automatic reset allowable time, the control module is also used for keeping the fault stop mark, sending fault information and controlling the central air conditioning unit to stop.

According to one embodiment of the invention, the control module is further configured to clear the fail-down flag; and after the judging module judges that the central air-conditioning unit meets the automatic restarting condition, controlling the central air-conditioning unit to automatically reset and restart.

According to an embodiment of the present invention, the determining that the central air conditioning unit satisfies the automatic restart condition includes: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to a first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

According to an embodiment of the present invention, the control module is further configured to dynamically adjust the preset automatic reset parameter pair according to an operation parameter of the central air conditioning unit, where the operation parameter of the central air conditioning unit includes a unit operation load.

According to one embodiment of the invention, the compressor comprises a single compressor or a multi-compressor train; the control module is further configured to: and when the compressor is the multi-compressor unit and the multi-compressor unit fails to automatically reset and restart, controlling the central air-conditioning unit to stop.

In order to achieve the above object, a central air conditioning unit according to a third aspect of the present invention includes a control device for the central air conditioning unit.

According to the central air conditioning unit provided by the embodiment of the invention, the control device of the central air conditioning unit is adopted to obtain the preset automatic reset parameters corresponding to the faults and carry out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a block schematic diagram of a central air conditioning unit configuration according to one embodiment of the present invention;

fig. 2 is a flowchart illustrating a control method of a central air conditioning unit according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a control method of a central air conditioning unit according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of a fault relationship for a central air conditioning unit according to one embodiment of the present invention;

fig. 5 is a block schematic diagram of a control device of a central air conditioning unit according to an embodiment of the present invention;

fig. 6 is a block diagram schematically illustrating a central air conditioning unit according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A central air conditioning unit, a control method and an apparatus thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a block diagram illustrating a configuration of a central air conditioning unit according to an embodiment of the present invention.

As shown in fig. 1, according to an embodiment of the present invention, a centralair conditioning unit 1000 includes a first refrigerant cycle system 10, a second refrigerant cycle system 20, the first refrigerant cycle system 10 includes a compressor 101, a condenser 102, anevaporator 103 and a throttling device 104, and the second refrigerant cycle system 20 includes theevaporator 103 and an indoor heat exchanger 201.

It should be understood that the central air conditioning unit according to the embodiment of the present invention may transfer the cold or heat generated by the first refrigerant cycle system 10 to the indoor heat exchanger 201 through the heat exchange between the first refrigerant and the second refrigerant in theevaporator 103, so as to realize the heat exchange between the second refrigerant and the heat load of the room for supplying energy. However, when the central air conditioning unit stops in the operation process, the heat exchange process is influenced by the stop phenomenon and the stop duration, so that the comfort of the air conditioner is greatly influenced.

Therefore, the embodiment of the invention provides a control method of a central air conditioning unit, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Fig. 2 is a flowchart illustrating a method for controlling a central air conditioning unit according to an embodiment of the present invention. As shown in fig. 2, the control method of the central air conditioning unit includes:

s101, obtaining the running state parameters of the central air conditioning unit, and judging whether the central air conditioning unit breaks down or not according to the running state parameters.

Specifically, according to one embodiment of the present invention, the operation state parameters include: the system parameters comprise the evaporating pressure of an evaporator, the condensing pressure of a condenser and the outlet water temperature of chilled water, and the compressor parameters comprise the exhaust pressure of a compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

The system comprises an evaporator, a condenser, a compressor power supply, a compressor heat exchanger, a compressor discharge end, a compressor internal oil level, a compressor power supply and a compressor power supply, wherein the evaporation pressure of the evaporator is the refrigerant pressure in the evaporation heat exchanger, the condensation pressure of the condenser is the refrigerant pressure in the condensation heat exchanger, the chilled water outlet temperature is the temperature of the heat exchange water outlet pipe port of.

Further, according to an embodiment of the present invention, determining whether the central air conditioning unit has a fault according to the operation status parameter includes:

if any one of the condensing pressure of the condenser and the exhaust pressure of the compressor is larger than a preset high-pressure threshold value; or, any one of the evaporating pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the outlet water temperature of the chilled water is less than a preset low-temperature threshold value; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

That is, when any one of the condensing pressure of the condenser and the discharge pressure of the compressor is greater than a preset high pressure threshold; or, any one of the evaporating pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the outlet water temperature of the chilled water is less than a preset low-temperature threshold value; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or when the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

Specifically, according to an embodiment of the present invention, the central air conditioning unit failure may include: the fault of the unit protection switch of the central air-conditioning unit and the fault of the detection device of the central air-conditioning unit.

Optionally, in an embodiment of the present invention, the central air conditioning unit may further include a unit protection switch, and the unit protection switch may include: the high-pressure protection switch at the exhaust end of the compressor can be arranged at the exhaust end of the compressor or the joint of the exhaust pipe of the compressor and the condenser, and the high-pressure protection switch at the exhaust end of the compressor is closed when the exhaust pressure of the compressor is greater than a preset high-pressure threshold value; the low-voltage protection switch at the air suction end of the compressor can be arranged at the air suction end of the compressor or the joint of the air suction pipe of the compressor and the evaporator, and the low-voltage protection switch at the air suction end of the compressor is closed when the air suction pressure of the compressor is smaller than a preset low-voltage threshold value; the compressor oil level switch can be arranged inside the compressor, and is closed when the internal oil level of the compressor is smaller than a preset oil level threshold value; the compressor overload protection switch can obtain the switching value output of the motor control module, such as the current of the compressor, and when the current of the compressor is larger than a preset current threshold value, the compressor overload protection switch is closed, so that the central air conditioning unit is protected through the unit protection switch.

Further, in an embodiment of the present invention, the central air conditioning unit may further include a unit detection device, and the unit detection device may include: the compressor air suction section low pressure detection sensor, the compressor exhaust end high pressure detection sensor, the compressor exhaust end temperature detection sensor and the like, wherein the compressor air suction section low pressure detection sensor can be arranged on a compressor air suction pipe and used for detecting the air suction pressure of the compressor, the compressor exhaust end high pressure detection sensor can be arranged on a compressor exhaust pipe and used for detecting the exhaust pressure of the compressor, and the compressor exhaust end temperature detection sensor can be arranged inside the compressor and used for detecting the exhaust temperature of the compressor.

And S102, if the central air conditioning unit is judged to have a fault, generating a fault stop sign, and acquiring a corresponding preset automatic reset parameter according to the fault.

Specifically, according to an embodiment of the present invention, the presetting of the auto-reset parameter may include: presetting automatic reset enabling, presetting automatic reset times and presetting automatic reset allowable time.

It should be noted that in the control method of the central air conditioning unit in the embodiment of the present invention, whether the current fault allows the central air conditioning unit to be automatically reset may be determined according to a preset automatic reset enable, and if the preset automatic reset enable is 1, the central air conditioning unit is allowed to be automatically reset; if the preset automatic reset enable is 0, the central air conditioning unit is not allowed to be automatically reset, in other words, the current fault relates to a unit safe operation fault.

In addition, in the control method of the central air conditioning unit according to the embodiment of the present invention, the preset automatic reset times are times for which the current fault allows the automatic reset to be performed, if the current fault performs the automatic reset times are greater than the preset automatic reset times, the central air conditioning unit is not allowed to be automatically reset, and the automatic reset permission time is time for which the current fault allows the automatic reset to be performed, and if the current fault performs the automatic reset time is greater than the preset automatic reset permission time, the central air conditioning unit is not allowed to be automatically reset.

Specifically, according to an embodiment of the present invention, when the central air conditioning unit triggers anti-freezing protection, such as when the temperature of the chilled water is less than a safe temperature threshold, or triggers chilled water flow fault protection, such as when the water flow of the central air conditioning unit system is insufficient or water is cut off, the central air conditioning unit is controlled to be forcibly stopped.

It should be understood that the anti-freeze protection and the chilled water flow fault protection are safety operation protection of the central air conditioning unit, in other words, when the central air conditioning unit triggers the anti-freeze protection or the chilled water flow protection, it may be considered that the central air conditioning unit does not allow the automatic reset restart operation, i.e., the preset automatic reset enable in the corresponding preset automatic reset parameter is 0.

Further, according to an embodiment of the present invention, when the central air conditioning unit triggers compressor suction temperature low temperature protection, for example, when the suction temperature of the compressor is less than a preset temperature threshold, the central air conditioning unit is controlled to be forcibly stopped.

It should be understood that the compressor suction temperature low-temperature protection is the safe operation boundary protection of the central air conditioning unit, in other words, when the central air conditioning unit triggers the compressor suction temperature low-temperature protection, it may be considered that the central air conditioning unit allows the automatic reset restart operation once, that is, the preset automatic reset enable preset in the corresponding preset automatic reset parameter is 1, and the preset automatic reset number is 1.

Furthermore, according to an embodiment of the present invention, when the suction pressure of the compressor is lower than the safe low pressure threshold, or the discharge pressure of the compressor is higher than the preset high pressure threshold, the central air conditioning unit is controlled to be forcibly stopped.

It should be noted that, in the embodiment of the present invention, the suction pressure protection of the compressor may include: the low suction pressure first stage protection, the low suction pressure second stage protection and the low suction pressure third stage protection, the discharge pressure protection of the compressor may include: high-exhaust-pressure first-stage protection, high-exhaust-pressure second-stage protection and high-exhaust-pressure third-stage protection, wherein, the low suction pressure first-stage protection and the high discharge pressure first-stage protection are the safe operation protection of the central air conditioning unit, the suction pressure second-stage protection, the low suction pressure third-stage protection, the high discharge pressure second-stage protection and the high discharge pressure third-stage protection are the safe operation boundary protection of the central air conditioning unit, the low suction pressure in the low suction pressure first-stage protection is smaller than the low suction pressure in the low suction pressure second-stage protection, the low suction pressure in the low suction pressure second-stage protection is smaller than the low suction pressure in the low suction pressure third-stage protection, the high exhaust pressure in the high exhaust pressure first-stage protection is larger than the high exhaust pressure in the high exhaust pressure second-stage protection, and the high exhaust pressure in the high exhaust pressure second-stage protection is larger than the high exhaust pressure in the high exhaust pressure third-stage protection.

In other words, when the low suction pressure first-stage protection or the high discharge pressure first-stage protection is triggered, it may be considered that the central air conditioning unit does not allow the automatic reset restart operation, i.e., the preset automatic reset enable in the corresponding preset automatic reset parameter is 0, and when the suction pressure second-stage protection or the low suction pressure third-stage protection or the high discharge pressure second-stage protection or the high discharge pressure third-stage protection is triggered, it may be considered that the central air conditioning unit allows the automatic reset restart operation, i.e., the preset automatic reset enable in the corresponding preset automatic reset parameter is 1.

It should be understood that if the current fault does not allow automatic reset, the operator may manually confirm that the fault is cleared and then start the central air conditioning unit again.

And S103, carrying out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters.

Therefore, whether the central air conditioning unit breaks down or not is judged according to the running state parameters of the central air conditioning unit, a fault stop sign is generated when the central air conditioning unit breaks down is judged, and automatic reset control is carried out on the central air conditioning unit according to the fault and the preset automatic reset parameters, so that automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Specifically, according to an embodiment of the present invention, as shown in fig. 3, the automatic reset control of the central air conditioning unit according to the preset automatic reset parameter includes:

s201, if the preset automatic reset enable is 0, maintaining a fault stop sign, sending fault information and controlling the central air conditioning unit to stop.

That is, when the preset automatic reset enable is 0, the malfunction stop flag is maintained, and malfunction information is issued and the central air conditioning unit is controlled to stop.

And S202, if the preset automatic reset enable is 1, further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times.

That is, when the preset automatic reset enable is 1, it is further determined whether the number of times of automatic reset is less than or equal to the preset number of times of reset, thereby determining whether the central air conditioning unit allows automatic reset restart.

And S203, if the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, keeping a fault stop sign, sending fault information and controlling the central air conditioning unit to stop.

That is, when the number of automatic resets of the central air conditioning unit is greater than the preset number of automatic resets, the malfunction stop flag is maintained, and malfunction information is sent and the central air conditioning unit is controlled to stop.

And S204, if the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset permission time.

That is, when the number of times of automatic reset of the central air conditioning unit is less than or equal to the preset number of times of automatic reset, it is further determined whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowing time, thereby determining whether the automatic reset restart of the central air conditioning unit is allowed.

And S205, if the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset permission time, controlling the automatic reset of the central air conditioning unit to restart.

That is, when the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset permission time, the central air conditioning unit is controlled to automatically reset and restart.

And S206, if the automatic reset time of the central air-conditioning unit is greater than the preset automatic reset allowable time, maintaining the fault stop mark, sending fault information and controlling the central air-conditioning unit to stop.

That is, when the automatic reset time of the central air conditioning unit is greater than the preset automatic reset allowable time, the fault stop flag is maintained, and fault information is sent and the central air conditioning unit is controlled to stop

Specifically, according to a specific embodiment of the present invention, in the operation process of the central air conditioning unit, an operation state parameter of the central air conditioning unit is obtained, and further, whether the central air conditioning unit has a fault is judged according to the operation state parameter of the central air conditioning unit, and when the central air conditioning unit has a fault, a fault shutdown flag is generated, and a corresponding preset automatic reset parameter is obtained according to the fault, wherein if the preset automatic reset enable is 1, the fault shutdown flag is maintained, and fault information is sent and the central air conditioning unit is controlled to be shutdown; if the preset automatic reset enable is 0, controlling a timer to start timing the automatic reset time of the central air conditioning unit, further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, if the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, keeping a fault stop sign, sending fault information and controlling the central air conditioning unit to stop, and if the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowed time.

That is, in the embodiment of the present invention, if the automatic reset enable is preset to 0, the automatic reset time and the automatic reset permission are not continuously determined, and if the automatic reset enable is preset to 1 and the automatic reset time is greater than the preset reset time, the automatic reset permission time is not continuously determined.

Further, according to an embodiment of the present invention, as shown in fig. 3, the controlling the central air conditioning unit to automatically reset and restart further includes:

and S207, clearing the fault stop sign, and controlling the central air-conditioning unit to automatically reset and restart after judging that the central air-conditioning unit meets the automatic restart condition.

Specifically, according to an embodiment of the present invention, the determining that the central air conditioning unit satisfies the automatic restart condition includes: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to the first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

For example, when the difference between two start times of the central air conditioning unit is greater than or equal to a preset start interval, the central air conditioning unit is judged to satisfy the automatic restart condition and is controlled to automatically reset and restart, or when the current chilled water outlet temperature of the central air conditioning unit is greater than or equal to a first preset start water temperature in a cooling mode, the central air conditioning unit is judged to satisfy the automatic restart condition and is controlled to automatically reset and restart, or when the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset start water temperature in a heating mode, the central air conditioning unit is judged to satisfy the automatic restart condition and is controlled to automatically reset and restart, or when the current compressor lubricating oil temperature of the central air conditioning unit is greater than or equal to a preset start oil temperature, the central air conditioning unit is judged to satisfy the automatic restart condition, and controlling the central air conditioning unit to automatically reset and restart.

Further, according to an embodiment of the present invention, the control method includes: and dynamically adjusting the preset automatic reset parameters according to the operation parameters of the central air-conditioning unit, wherein the operation parameters of the central air-conditioning unit comprise unit operation load.

For example, in some embodiments of the present invention, the preset automatic reset enable, the preset automatic reset times and the preset automatic reset permission time may be adjusted according to the unit operation load, for example, when the central air conditioning unit operation load is 50%, the preset automatic reset enable is adjusted to 1, the preset automatic reset times are adjusted to 2, the preset automatic reset operation time is adjusted to 5, and when the central air conditioning unit operation load is increased to 100%, the automatic reset enable is dynamically adjusted to 1, the preset automatic reset times are dynamically adjusted to 1, and the preset automatic reset operation time is dynamically adjusted to 3.

It should be understood that, in the embodiment of the present invention, the higher the unit operation load is, the more times the central air conditioning unit triggers the exhaust pressure protection are, and therefore, according to the unit operation load, the preset automatic reset enable, the preset automatic reset times and the preset automatic reset permission time are adjusted accordingly, so that the central air conditioning unit operates safely and stably.

Further, according to an embodiment of the present invention, the compressor includes a single compressor or a multi-compressor train; the method further comprises the following steps:

and if the compressor is a multi-compressor unit and the multi-compressor unit fails to reset and restart automatically, controlling the central air-conditioning unit to stop.

Specifically, as shown in fig. 4, the overall control and the compressor control of the central air conditioning unit have the following relationship: the compressor control is part of the overall control, which may further include: the system comprises a water pump control unit, a fan control unit, an electronic expansion valve control unit, a four-way valve control unit and the like, wherein when the compressors are multiple compressor units, only the compressors triggering fault protection are controlled to stop, fault prompt information is sent, the rest compressors keep normal operation, and after all the compressors fail to automatically reset, the central air conditioning unit is controlled to stop.

It should be noted that, in an embodiment of the present invention, when the compressor fails, it is considered that the central air conditioning unit allows automatic reset restart operation, that is, the preset automatic reset enable in the corresponding preset automatic reset parameter is 1, and the automatic reset times and the automatic reset allowed time may be calibrated correspondingly according to the model of the compressor.

In summary, according to the control method of the central air conditioning unit provided by the embodiment of the present invention, the operation state parameter of the central air conditioning unit is obtained, and whether the central air conditioning unit has a fault is determined according to the operation state parameter, and when it is determined that the central air conditioning unit has a fault, the fault stop flag is generated, and the corresponding preset automatic reset parameter is obtained according to the fault, and further, the central air conditioning unit is subjected to automatic reset control according to the preset automatic reset parameter, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Fig. 5 is a block diagram illustrating a control apparatus of a central air conditioning unit according to an embodiment of the present invention.

As shown in fig. 5, thecontrol device 100 for a central air conditioning unit includes: the device comprises an acquisition module 1, a judgment module 2, a generation module 3 and a control module 4.

The acquisition module 1 is used for acquiring the running state parameters of the central air conditioning unit; the judging module 2 is used for judging whether the central air-conditioning unit breaks down or not according to the running state parameters; the generating module 3 is used for generating a fault shutdown mark when judging that the central air conditioning unit has a fault, and the acquiring module 1 is also used for acquiring corresponding preset automatic reset parameters according to the fault; the control module 4 is used for carrying out automatic reset control on the central air conditioning unit according to preset automatic reset parameters.

Further, according to an embodiment of the present invention, the central air conditioning unit includes a first refrigerant circulation system including a compressor, a condenser, an evaporator, and a throttle device, and a second refrigerant circulation system including an evaporator and an indoor heat exchanger.

Further, according to an embodiment of the present invention, the operation state parameters include: the system parameters comprise the evaporating pressure of an evaporator, the condensing pressure of a condenser and the outlet water temperature of chilled water, and the compressor parameters comprise the exhaust pressure of a compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

Further, according to an embodiment of the present invention, the presetting of the auto-reset parameter includes: presetting automatic reset enabling, presetting automatic reset times and presetting automatic reset allowing time.

Further, according to an embodiment of the present invention, the determining module 2 is further configured to, if any one of the condensing pressure of the condenser and the discharge pressure of the compressor is greater than a preset high-pressure threshold; or, any one of the evaporating pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the outlet water temperature of the chilled water is less than a preset low-temperature threshold value; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

Further, according to an embodiment of the present invention, when the preset automatic reset enable is 0, the control module 4 is further configured to maintain a fault stop flag, send fault information, and control the central air conditioning unit to stop; when the preset automatic reset enable is 1, the judging module 2 is also used for further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times; when the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, the control module 4 is also used for keeping a fault stop sign, sending fault information and controlling the central air conditioning unit to stop; when the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, the judgment module 2 is also used for further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time; when the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time, the control module 4 is also used for controlling the automatic reset restart of the central air conditioning unit; when the automatic reset time of the central air conditioning unit is longer than the preset automatic reset allowing time, the control module 4 is also used for keeping a fault stop sign, sending out fault information and controlling the central air conditioning unit to stop.

Further, according to an embodiment of the present invention, after the determining module 2 determines that the central air conditioning unit meets the automatic restart condition, the control module 4 is further configured to clear the fault stop flag and control the central air conditioning unit to automatically reset and restart.

Further, according to an embodiment of the present invention, the determining that the central air conditioning unit satisfies the automatic restart condition includes: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to the first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

Further, according to an embodiment of the present invention, the control module 4 is further configured to preset an automatic reset parameter pair for dynamic adjustment according to an operation parameter of the central air conditioning unit, where the operation parameter of the central air conditioning unit includes a unit operation load.

Further, according to an embodiment of the present invention, the compressor includes a single compressor or a multi-compressor train; the control module 4 is further configured to: and when the compressor is a multi-compressor unit and the multi-compressor unit fails to reset and restart automatically, the central air-conditioning unit is controlled to stop.

In summary, according to the control device of the central air conditioning unit in the embodiment of the present invention, the obtaining module obtains the operating state parameter of the central air conditioning unit, the determining module determines whether the central air conditioning unit has a fault according to the operating state parameter, the generating module generates the fault stop flag after determining that the central air conditioning unit has the fault, the obtaining module obtains the preset automatic reset parameter corresponding to the fault, and the control module performs automatic reset control on the central air conditioning unit according to the preset automatic reset parameter, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

Further, as shown in fig. 6, an embodiment of the present invention provides a centralair conditioning unit 1000, which includes thecontrol device 100 of the central air conditioning unit.

According to the central air conditioning unit provided by the embodiment of the invention, the control device of the central air conditioning unit is adopted to obtain the preset automatic reset parameters corresponding to the faults and carry out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters, so that the automatic reset restart of the central air conditioning unit is realized, and the stability and the use comfort of the central air conditioning unit are improved.

It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (17)

1. A control method of a central air conditioning unit is characterized by comprising the following steps:

acquiring an operation state parameter of the central air conditioning unit, and judging whether the central air conditioning unit breaks down or not according to the operation state parameter;

if the central air conditioning unit is judged to have a fault, generating a fault shutdown mark, and acquiring corresponding preset automatic reset parameters according to the fault, wherein the preset automatic reset parameters comprise: presetting automatic reset enabling, automatic reset times and automatic reset allowing time;

according to the preset automatic reset parameter, the automatic reset control is carried out on the central air conditioning unit, and the method comprises the following steps:

if the preset automatic reset enable is 0, maintaining the fault stop sign, sending fault information and controlling the central air conditioning unit to stop;

if the preset automatic reset enable is 1, further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times;

if the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, maintaining the fault stop sign, sending fault information and controlling the central air conditioning unit to stop;

if the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time;

if the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time, controlling the central air conditioning unit to automatically reset and restart;

if the automatic reset time of the central air conditioning unit is longer than the preset automatic reset allowable time, the fault stop mark is kept, and fault information is sent out and the central air conditioning unit is controlled to stop.

2. The control method according to claim 1, wherein the central air conditioning unit includes a first refrigerant circulation system including a compressor, a condenser, an evaporator and a throttle device, a second refrigerant circulation system including the evaporator and an indoor heat exchanger.

3. The control method of claim 2, wherein the operating state parameters include: the system parameters comprise the evaporation pressure of the evaporator, the condensation pressure of the condenser and the chilled water outlet temperature, and the compressor parameters comprise the exhaust pressure of the compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

4. The method as claimed in claim 3, wherein said determining whether the central air conditioning unit is out of order according to the operation status parameter comprises:

if any one of the condensing pressure of the condenser and the exhaust pressure of the compressor is larger than a preset high-pressure threshold value; or, any one of the evaporation pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the temperature of the outlet water of the chilled water is less than a preset low-temperature threshold; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

5. The control method according to claim 3, wherein the controlling the central air conditioning unit to automatically reset and restart further comprises:

and clearing the fault shutdown mark, and controlling the central air conditioning unit to automatically reset and restart after judging that the central air conditioning unit meets the automatic restart condition.

6. The control method according to claim 5, wherein said determining that the central air conditioning unit satisfies an automatic restart condition comprises: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to a first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

7. The control method according to claim 1, characterized in that the method comprises: and dynamically adjusting the preset automatic reset parameters according to the operation parameters of the central air-conditioning unit, wherein the operation parameters of the central air-conditioning unit comprise unit operation load.

8. The control method of claim 2, wherein the compressor comprises a single compressor or a multi-compressor train; the method further comprises the following steps:

and if the compressor is the multi-compressor unit and the multi-compressor unit fails to automatically reset and restart, controlling the central air-conditioning unit to stop.

9. A control device for a central air conditioning unit, characterized in that it comprises:

the acquisition module is used for acquiring the running state parameters of the central air conditioning unit;

the judging module is used for judging whether the central air conditioning unit breaks down or not according to the running state parameters;

the generating module is used for generating a fault shutdown mark when the central air conditioning unit is judged to have a fault, and the acquiring module is further used for acquiring corresponding preset automatic reset parameters according to the fault, wherein the preset automatic reset parameters comprise: presetting automatic reset enabling, automatic reset times and automatic reset allowing time;

the control module is used for carrying out automatic reset control on the central air conditioning unit according to the preset automatic reset parameters;

when the preset automatic reset enable is 0, the control module is also used for keeping the fault stop mark, sending fault information and controlling the central air conditioning unit to stop;

when the preset automatic reset enable is 1, the judging module is further used for further judging whether the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times;

when the automatic reset times of the central air conditioning unit are greater than the preset automatic reset times, the control module is further used for keeping the fault stop mark, sending fault information and controlling the central air conditioning unit to stop;

when the automatic reset times of the central air conditioning unit are less than or equal to the preset automatic reset times, the judging module is also used for further judging whether the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset allowable time;

when the automatic reset time of the central air conditioning unit is less than or equal to the preset automatic reset permission time, the control module is also used for controlling the automatic reset restart of the central air conditioning unit;

and when the automatic reset time of the central air conditioning unit is longer than the preset automatic reset allowable time, the control module is also used for keeping the fault stop mark, sending fault information and controlling the central air conditioning unit to stop.

10. The control apparatus according to claim 9, wherein the central air conditioning unit includes a first refrigerant circulation system including a compressor, a condenser, an evaporator and a throttle device, a second refrigerant circulation system including the evaporator and an indoor heat exchanger.

11. The control apparatus of claim 10, wherein the operating condition parameters include: the system parameters comprise the evaporation pressure of the evaporator, the condensation pressure of the condenser and the chilled water outlet temperature, and the compressor parameters comprise the exhaust pressure of the compressor, the suction pressure of the compressor, the exhaust temperature of the compressor, the internal oil level of the compressor and the current of the compressor.

12. The apparatus of claim 11, wherein the determining module is further configured to determine whether any one of a condensing pressure of the condenser and a discharge pressure of the compressor is greater than a preset high pressure threshold; or, any one of the evaporation pressure of the evaporator and the suction pressure of the compressor is less than a preset low-pressure threshold; or the temperature of the outlet water of the chilled water is less than a preset low-temperature threshold; or the exhaust temperature of the compressor is greater than a preset high-temperature threshold value; or the internal oil level of the compressor is smaller than a preset oil level threshold value; or, if the current of the compressor is larger than a preset current threshold value, determining that the central air conditioning unit has a fault.

13. The control device according to claim 11, wherein after the determining module determines that the central air conditioning unit satisfies the automatic restart condition, the control module is further configured to clear the malfunction stop flag and control the central air conditioning unit to automatically reset and restart.

14. The control apparatus of claim 13, wherein said determining that the central air conditioning unit satisfies an automatic restart condition comprises: the difference between the two starting times of the central air conditioning unit is greater than or equal to a preset starting interval; or in the refrigeration mode, the current outlet water temperature of the chilled water of the central air conditioning unit is greater than or equal to a first preset starting water temperature; or in the heating mode, the current cooling water outlet temperature of the central air conditioning unit is less than or equal to a second preset starting water temperature; or the current temperature of the compressor lubricating oil of the central air-conditioning unit is greater than or equal to the preset starting oil temperature.

15. The control device of claim 9, wherein the control module is further configured to dynamically adjust the preset automatic reset parameter pair according to an operating parameter of the central air conditioning unit, wherein the operating parameter of the central air conditioning unit comprises a unit operating load.

16. The control apparatus of claim 10, wherein the compressor comprises a single compressor or a multiple compressor train; the control module is further configured to: and when the compressor is the multi-compressor unit and the multi-compressor unit fails to automatically reset and restart, controlling the central air-conditioning unit to stop.

17. Central air conditioning assembly, characterized in that it comprises control means of a central air conditioning assembly according to any of claims 9 to 16.

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