CN113465113A - Control method and device for low-temperature refrigeration of air conditioner and air conditioner - Google Patents

Abstract

Translated fromChinese

本发明提供了一种空调低温制冷的控制方法、装置及空调器，该方法包括：在低温制冷情况下，获取压缩机的实际运行频率；根据实际运行频率及压缩机的目标运行频率，计算频率偏差值；若在连续多个周期内出现频率低且偏差高状态的次数大于次数阈值，则提高目标运行频率。本发明可以根据一定周期内实际运行频率及频率偏差值的大小，确定是否提高目标运行频率，通过提高目标运行频率可以增加空调在过渡季节制冷运行时的运行稳定性，避免出现压缩机与压缩机驱动未联停机保护。

The invention provides a control method, device and air conditioner for low-temperature refrigeration of an air conditioner. The method includes: in the case of low-temperature refrigeration, obtaining the actual operating frequency of the compressor; calculating the frequency according to the actual operating frequency and the target operating frequency of the compressor Deviation value; if the number of low frequency and high deviation states occurs in multiple consecutive cycles is greater than the number of times threshold, the target operating frequency will be increased. The present invention can determine whether to increase the target operating frequency according to the actual operating frequency and the magnitude of the frequency deviation value in a certain period, and by increasing the target operating frequency, the operating stability of the air conditioner during the cooling operation in transitional seasons can be increased, and the occurrence of compressors and compressors can be avoided. Drive is not connected to shutdown protection.

Description

Control method and device for low-temperature refrigeration of air conditioner and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to a control method and device for low-temperature refrigeration of an air conditioner and the air conditioner.

Background

Under the condition of refrigerating operation of the air conditioner in transition seasons (spring and autumn), the compressor operates at low frequency due to the influence of the additional combination of the refrigerant and the external environment, the operating range of the compressor is critical, the rotating speed of the compressor is low, the difficulty of control stability is high, the problem that the compressor and the compressor are not connected due to unstable control is caused, and the system operation stability is poor.

Disclosure of Invention

The invention solves the problem that the prior air conditioner has poor operation stability during the refrigerating operation in the transitional season.

In order to solve the above problems, the present invention provides a method for controlling low-temperature refrigeration of an air conditioner, the method comprising: under the condition of low-temperature refrigeration, acquiring the actual operating frequency of the compressor; calculating a frequency deviation value according to the actual operating frequency and the target operating frequency of the compressor; if the frequency of the low-deviation high state is greater than the frequency threshold value in a plurality of continuous periods, the target running frequency is increased; and under the low-frequency and high-deviation state, the actual running frequency of the compressor is less than or equal to a low-frequency threshold value, and the frequency deviation value is greater than or equal to a deviation threshold value.

The method can determine whether to improve the target operation frequency according to the actual operation frequency in a certain period and the magnitude of the frequency deviation value, can improve the operation stability of the air conditioner during the refrigerating operation in a transition season by improving the target operation frequency, and avoids the phenomenon of compressor and compressor drive non-linked shutdown protection.

Optionally, if the number of times of the low frequency and high deviation state occurring in a plurality of consecutive cycles is greater than a number threshold, increasing the target operating frequency includes: if the frequency which is greater than or equal to the frequency threshold value is low and the deviation is high in more than n/2 cycles in the continuous n cycles, increasing the target running frequency by a first frequency; if the frequency which is greater than or equal to the time threshold value is low and the deviation is high in less than n/2 periods in the continuous n periods, increasing the target operation frequency by a second frequency; the first frequency is greater than the second frequency.

The invention can judge whether more than half of the continuous periods have the states of low frequency and high deviation exceeding the frequency threshold value, if so (the running stability of the compressor is worse), the first frequency is improved on the basis of the target running frequency, and if not (the running stability of the compressor is worse), the second frequency is improved on the basis of the target running frequency, thereby controlling the frequency improvement degree and increasing the running stability of the compressor according to the difference of the running stability of the compressor.

Optionally, the method further comprises: acquiring the outdoor environment temperature; and if the outdoor environment temperature is less than the temperature threshold value and the system operates in the refrigeration mode, determining the low-temperature refrigeration condition.

The invention also provides a specific mode for determining whether to operate under the condition of low-temperature refrigeration, so that the low-temperature refrigeration control process can be accurately entered, and the control accuracy is improved.

Optionally, the method further comprises: acquiring the suction superheat degree and the exhaust superheat degree of the compressor; if the suction superheat degree is less than or equal to a first superheat degree threshold value and the exhaust superheat degree is greater than or equal to a second superheat degree threshold value in n continuous periods, controlling to reduce the number of expansion valve steps; and if the suction superheat degree is less than or equal to the first superheat degree threshold value and the exhaust superheat degree is less than the second superheat degree threshold value in n continuous periods, outputting a compressor driving fault prompt and controlling the compressor to stop.

The invention provides a mechanism for controlling the expansion valve and driving fault early warning according to the suction superheat degree and the exhaust superheat degree, and corresponding adjustment control is carried out in time when liquid return possibly occurs, so that the risk of system operation is reduced, and the reliability of the air conditioner is ensured.

Optionally, the suction superheat is the difference between the suction temperature of the compressor and the saturation temperature corresponding to the low pressure; the exhaust superheat degree is the difference value between the exhaust temperature of the compressor and the saturation temperature corresponding to the high-pressure.

The invention defines the suction superheat degree and the exhaust superheat degree, and can control the expansion valve based on the suction superheat degree and the exhaust superheat degree, thereby carrying out corresponding adjustment control in time when liquid return possibly occurs, reducing the risk of system operation and ensuring the reliability of the air conditioner.

Optionally, a value range of the low frequency threshold is greater than or equal to 1, and a value range of the deviation threshold is greater than or equal to 20 and less than or equal to 30.

The invention provides the value ranges of the low-frequency threshold and the deviation threshold, thereby accurately judging the running stability state of the system.

Optionally, a value range of the first frequency is greater than or equal to 4 and less than or equal to 8, and a value range of the second frequency is greater than or equal to 1 and less than or equal to 3.

The invention provides the value ranges of the first frequency and the second frequency, thereby accurately controlling the target operation frequency of the compressor and improving the operation stability of the system.

The invention provides a control device for low-temperature refrigeration of an air conditioner, which comprises: the frequency acquisition module is used for acquiring the actual operating frequency of the compressor under the condition of low-temperature refrigeration; the frequency deviation calculation module is used for calculating a frequency deviation value according to the actual operating frequency and the target operating frequency of the compressor; the frequency adjusting module is used for increasing the target operation frequency if the frequency of the low-deviation high state is greater than a frequency threshold value in a plurality of continuous periods; and under the low-frequency and high-deviation state, the actual running frequency of the compressor is less than or equal to a low-frequency threshold value, and the frequency deviation value is greater than or equal to a deviation threshold value.

The invention provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the method.

The present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the method.

The control device for the low-temperature refrigeration of the air conditioner, the air conditioner and the computer readable storage medium can achieve the same technical effect as the control method for the low-temperature refrigeration of the air conditioner.

Drawings

Fig. 1 is a schematic flow chart of a control method for low-temperature refrigeration of an air conditioner in an embodiment of the invention;

FIG. 2 is a schematic flow chart of a control method for low-temperature refrigeration preventive drive protection of an air conditioner in an embodiment of the invention;

fig. 3 is a schematic structural diagram of a control device for low-temperature refrigeration of an air conditioner in an embodiment of the invention.

Description of reference numerals:

301-frequency acquisition module; 302-a frequency deviation calculation module; 303-frequency adjustment module.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the low-temperature refrigeration operation process of the existing air conditioner, the target frequency of the compressor is not related to the driving operation stability, the suction superheat degree and the exhaust superheat degree within a fixed outer ring temperature range. During compressor drive control, low-frequency operation usually easily reaches the critical operable range of the compressor, and the rotational speed is low, and the control stability degree of difficulty is big, and the unstable control easily appears and leads to compressor and compressor drive not to ally oneself with the shutdown protection.

The air conditioner control method provided by the embodiment of the invention combines low frequency, driving control stability and air suction and exhaust temperature to control when the air conditioner operates at low temperature for refrigeration, thereby ensuring the operation stability of the air conditioner.

Fig. 1 is a schematic flow chart of a control method for low-temperature refrigeration of an air conditioner in one embodiment of the invention, and the method comprises the following steps:

and S102, acquiring the actual operating frequency of the compressor under the condition of low-temperature refrigeration.

The air conditioner is operated in a refrigeration mode, at least one internal machine is started, the air conditioner can be operated for a1 minutes after being started, and then all the steps of the air conditioner low-temperature refrigeration method of the embodiment are executed, because the frequency of a compressor in the starting stage is usually far higher than the lowest frequency, the air conditioner low-temperature refrigeration method can not be included in the control range of the method. Wherein 3 is less than or equal to a1 is less than or equal to 7, for example, a1 is 5.

Alternatively, by comparing the outdoor ambient temperature with a preset ambient temperature threshold, it can be determined whether or not the operation is being performed in the low temperature cooling condition. Firstly, acquiring outdoor environment temperature; and then, if the outdoor environment temperature is less than the temperature threshold value and the outdoor environment temperature is operated in the refrigeration mode, determining that the outdoor environment temperature is the low-temperature refrigeration condition.

Each parameter acquired in this embodiment may be acquired periodically according to a preset time interval, for example, k seconds is 1 cycle, specifically, k may be a value range of 20 ≦ k ≦ 40, for example, k is 30. The period can be flexibly determined according to empirical values, abnormal protection can be caused when the control response is not timely due to overlong period, and overshoot and poor stability can be caused when the control action is too frequent due to overlong period.

And S104, calculating a frequency deviation value according to the actual operating frequency and the target operating frequency of the compressor.

The target compressor frequency F1 and the actual operating frequency F2 have frequency deviation values Δ F | F1-F2 |, where Δ F is an absolute value. If the absolute value is not zero, the compressor control is unstable at the moment, namely the actual operation frequency of the compressor is fluctuated up and down in a jumping manner around the normal frequency of the compressor.

And S106, if the frequency of the low-deviation high state is more than the frequency threshold value in a plurality of continuous periods, increasing the target operation frequency.

In this embodiment, how to adjust the target operating frequency can be determined by the magnitude of the frequency deviation value in a plurality of consecutive periods and the magnitude of the actual operating frequency. In the low and high frequency deviation state, the actual operating frequency of the compressor is less than or equal to the low frequency threshold, and the frequency deviation value is greater than or equal to the deviation threshold.

If the actual operating frequency is less than or equal to the low frequency threshold, the compressor operates in a risky low frequency band, the control is easy to be unstable, and the requirement for the control is higher below the low frequency threshold. If the frequency deviation value is greater than or equal to the deviation threshold value, the running frequency of the compressor fluctuates repeatedly, and the running is unstable.

Optionally, if a state with a low frequency greater than or equal to the number threshold and a high deviation occurs in more than n/2 cycles of the n consecutive cycles, increasing the target operating frequency by a first frequency; and if the low-frequency and high-deviation state which is greater than or equal to the time threshold value occurs in less than n/2 cycles in the n continuous cycles, increasing the target operation frequency by a second frequency. The first frequency is greater than the second frequency.

In the above-mentioned more than n/2 cycles, the above-mentioned low frequency and high deviation state greater than or equal to the number threshold value occurs in each cycle, which indicates that the compressor operation stability is poor and a higher target frequency needs to be raised. In the less than n/2 periods, the low frequency and high deviation state greater than or equal to the frequency threshold value occurs in each period, which indicates that the compressor operation stability is poor and a higher target frequency needs to be increased.

Alternatively, if the above condition is not satisfied, the control is normal.

Illustratively, the value range of the low frequency threshold is greater than or equal to 1, the value range of the deviation threshold is greater than or equal to 20 and less than or equal to 30, the value range of the first frequency is greater than or equal to 4 and less than or equal to 8, and the value range of the second frequency is greater than or equal to 1 and less than or equal to 3.

The control method for low-temperature refrigeration of the air conditioner provided by this embodiment can determine whether to increase the target operating frequency according to the actual operating frequency and the magnitude of the frequency deviation value in a certain period, and can increase the operating stability of the air conditioner during the refrigeration operation in a transitional season by increasing the target operating frequency, thereby avoiding the occurrence of the protection that the compressor and the compressor are not driven to be in a shutdown state.

On the basis of improving the low-temperature refrigeration operation stability by improving the target operation frequency, the opening degree of the expansion valve can be controlled by the suction superheat degree and the exhaust superheat degree, so that the low-temperature refrigeration operation stability is further improved. Based on this, the above method may further include the steps of:

first, the suction superheat and the discharge superheat of the compressor are acquired. The suction superheat degree is the difference value of the suction temperature of the compressor and the saturation temperature corresponding to the low-pressure; the exhaust superheat degree is the difference between the exhaust temperature of the compressor and the saturation temperature corresponding to the high pressure.

Secondly, if the suction superheat degree is less than or equal to a first superheat degree threshold value and the exhaust superheat degree is greater than or equal to a second superheat degree threshold value in n continuous periods, controlling to reduce the number of expansion valve steps; and if the suction superheat degree is less than or equal to the first superheat degree threshold value and the exhaust superheat degree is less than the second superheat degree threshold value in the continuous n periods, outputting a compressor driving fault prompt and controlling the compressor to stop.

The control index of the expansion valve is the superheat degree of the inner machine, and if the superheat degree of an outlet-inlet of the inner machine is less than or equal to 0 ℃, the liquid returns to the machine set. The expansion valve control is shown on the whole machine, the liquid return of the compressor is actually controlled, the suction superheat degree is low, the state of the refrigerant sucked by the compressor is a supercooled state (namely liquid state), the exhaust superheat degree is similar, the state of the refrigerant discharged by the compressor is a supercooled state, and the compressor is also in the liquid return state at the moment. The two return liquids at the same time indicate that the reliability risk is large at the moment.

Fig. 2 is a schematic flow chart of a control method for preventing driving protection of air conditioner low temperature refrigeration in an embodiment of the invention, wherein the method comprises the following steps:

and S201, operating the air conditioner for a1 minutes in a cooling mode.

S202, detecting whether the outer ring temperature Tao is greater than or equal to T0. If yes, go to S203; if not, go to S204.

If Tao is less than T0, the system enters a low-temperature refrigeration low-frequency control mode; if Tao is more than or equal to T0, the system operates according to normal control logic.

And S203, normally controlling to run.

And S204, calculating a frequency deviation value delta F of the actual running frequency.

S205, if the frequency is greater than or equal to m times of F2 and less than or equal to F2' and delta F is greater than or equal to b in n continuous cycles and greater than n/2 cycles, increasing the frequency of the compressor by F1 Hz on the basis of the current target frequency F1.

S206, if the frequency of the compressor is greater than or equal to m times F2 and less than or equal to F2' and delta F and more than or equal to b in n continuous cycles and less than or equal to n/2 cycles, increasing the frequency of the compressor by F2 Hz on the basis of the current target frequency F1.

Wherein n, m and b are constant empirical values; n is more than 1 and less than or equal to 5, and n/2 is rounded; m is more than or equal to 3 and less than or equal to 7; b is more than or equal to 1; f2' is more than or equal to 20 and less than or equal to 30; f1 is more than or equal to 4 and less than or equal to 8; f2 is more than or equal to 1 and less than or equal to 3. For example, n is 3, m is 5, b is 1, F2' is 25, F1 is 5, and F2 is 2.

And S207, otherwise, normally controlling to run.

S208, the intake superheat degree delta Ts and the exhaust superheat degree delta Td are calculated.

Wherein, the delta Ts is Ts-Tps, and Tps is the saturation temperature corresponding to the low pressure Ps; Δ Td is Td — Tpd, and Tpd is the saturation temperature corresponding to the high pressure Pd.

S209, if the delta Ts is less than or equal to c and the delta Td is greater than or equal to d continuously for n periods, closing the electronic expansion valve Pw by g steps.

S210, if the conditions that the delta Ts is less than or equal to c and the delta Td is less than or equal to d are continuously monitored for n periods, reporting the compressor driving fault to shut down by the unit.

And S211, otherwise, normally controlling to run.

Wherein c, d and g are constant empirical values, c is more than or equal to-1 and less than or equal to 3, d is more than or equal to 3 and less than or equal to 10, and g is more than or equal to 10 and less than or equal to 20. For example, c is 0, d is 5, and g is 15.

The method provided by the embodiment can be used for carrying out prejudgment, optimization and alarm on the drive protection risk which possibly occurs when the compressor operates at the low frequency in advance by combining the stability of the actual operating frequency of the compressor.

Fig. 3 is a schematic structural diagram of a control device for low-temperature refrigeration of an air conditioner in an embodiment of the invention, the device comprises:

thefrequency acquisition module 301 is used for acquiring the actual operating frequency of the compressor under the condition of low-temperature refrigeration;

a frequencydeviation calculating module 302, configured to calculate a frequency deviation value according to the actual operating frequency and a target operating frequency of the compressor;

afrequency adjustment module 303, configured to increase the target operating frequency if the number of times that a low-frequency and high-deviation state occurs in a plurality of consecutive periods is greater than a number threshold; and under the low-frequency and high-deviation state, the actual running frequency of the compressor is less than or equal to a low-frequency threshold value, and the frequency deviation value is greater than or equal to a deviation threshold value.

The control device for low-temperature refrigeration of the air conditioner provided by the embodiment can determine whether to improve the target operation frequency according to the actual operation frequency and the frequency deviation value in a certain period, can increase the operation stability of the air conditioner during the refrigeration operation in a transition season by improving the target operation frequency, and avoids the phenomenon of compressor and compressor drive non-linked shutdown protection.

Optionally, as an embodiment, thefrequency adjustment module 303 is specifically configured to: if the frequency which is greater than or equal to the frequency threshold value is low and the deviation is high in more than n/2 cycles in the continuous n cycles, increasing the target running frequency by a first frequency; if the frequency which is greater than or equal to the time threshold value is low and the deviation is high in less than n/2 periods in the continuous n periods, increasing the target operation frequency by a second frequency; the first frequency is greater than the second frequency.

Optionally, as an embodiment, the apparatus further includes a low temperature refrigeration determination module, configured to: acquiring the outdoor environment temperature; and if the outdoor environment temperature is less than the temperature threshold value and the system operates in the refrigeration mode, determining the low-temperature refrigeration condition.

Optionally, as an embodiment, the apparatus further comprises an expansion valve control module for: acquiring the suction superheat degree and the exhaust superheat degree of the compressor; if the suction superheat degree is less than or equal to a first superheat degree threshold value and the exhaust superheat degree is greater than or equal to a second superheat degree threshold value in n continuous periods, controlling to reduce the number of expansion valve steps; and if the suction superheat degree is less than or equal to the first superheat degree threshold value and the exhaust superheat degree is less than the second superheat degree threshold value in n continuous periods, outputting a compressor driving fault prompt and controlling the compressor to stop.

Optionally, as an embodiment, the suction superheat is a difference between a suction temperature of the compressor and a saturation temperature corresponding to a low-pressure; the exhaust superheat degree is the difference value between the exhaust temperature of the compressor and the saturation temperature corresponding to the high-pressure.

Optionally, as an embodiment, a value range of the low frequency threshold is greater than or equal to 1, and a value range of the deviation threshold is greater than or equal to 20 and less than or equal to 30.

Optionally, as an embodiment, a value range of the first frequency is greater than or equal to 4 and less than or equal to 8, and a value range of the second frequency is greater than or equal to 1 and less than or equal to 3.

The embodiment of the invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the control method for the low-temperature refrigeration of the air conditioner.

The embodiment of the invention also provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is read and executed by a processor, the control method for low-temperature refrigeration of an air conditioner provided by the embodiment is realized, the same technical effects can be achieved, and the details are not repeated here to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The control device for the low-temperature refrigeration of the air conditioner and the air conditioner disclosed by the embodiment correspond to the control method for the low-temperature refrigeration of the air conditioner disclosed by the embodiment, so that the description is relatively simple, and relevant points can be referred to the description of the method part.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

Translated fromChinese

1.一种空调低温制冷的控制方法，其特征在于，所述方法包括：1. a control method of air-conditioning low temperature refrigeration, it is characterized in that, described method comprises:在低温制冷情况下，获取压缩机的实际运行频率；In the case of low temperature refrigeration, obtain the actual operating frequency of the compressor;根据所述实际运行频率及所述压缩机的目标运行频率，计算频率偏差值；Calculate a frequency deviation value according to the actual operating frequency and the target operating frequency of the compressor;若在连续多个周期内出现频率低且偏差高状态的次数大于次数阈值，则提高所述目标运行频率；所述频率低且偏差高状态下，所述压缩机的实际运行频率小于或等于低频阈值，且所述频率偏差值大于或等于偏差阈值。If the number of occurrences of the low frequency and high deviation state in multiple consecutive cycles is greater than the number threshold, the target operating frequency is increased; in the low frequency and high deviation state, the actual operating frequency of the compressor is less than or equal to the low frequency threshold, and the frequency deviation value is greater than or equal to the deviation threshold.2.如权利要求1所述的方法，其特征在于，所述若在连续多个周期内出现频率低且偏差高状态的次数大于次数阈值，则提高所述目标运行频率，包括：2 . The method according to claim 1 , wherein if the number of occurrences of low frequency and high deviation states in multiple consecutive cycles is greater than the number of times threshold, increasing the target operating frequency, comprising: 2 .若连续n个周期中的多于n/2个周期中，均出现大于或等于次数阈值的频率低且偏差高状态，则将所述目标运行频率增加第一频率；If the frequency greater than or equal to the number of times threshold is low and the deviation is high in more than n/2 cycles in consecutive n cycles, the target operating frequency is increased by the first frequency;若连续n个周期中的少于n/2个周期中，均出现大于或等于所述次数阈值的频率低且偏差高状态，则将所述目标运行频率增加第二频率；If the frequency greater than or equal to the number of times threshold is low and the deviation is high in less than n/2 cycles in consecutive n cycles, the target operating frequency is increased by a second frequency;所述第一频率大于所述第二频率。The first frequency is greater than the second frequency.3.如权利要求1所述的方法，其特征在于，所述方法还包括：3. The method of claim 1, wherein the method further comprises:获取室外环境温度；Get the outdoor ambient temperature;若所述室外环境温度小于温度阈值且运行于制冷模式，则确定为所述低温制冷情况。If the outdoor ambient temperature is less than the temperature threshold and the cooling mode is operated, the low temperature cooling condition is determined.4.如权利要求1所述的方法，其特征在于，所述方法还包括：4. The method of claim 1, wherein the method further comprises:获取所述压缩机的吸气过热度及排气过热度；Obtain the suction superheat degree and the exhaust superheat degree of the compressor;若在连续n个周期中，所述吸气过热度小于或等于第一过热度阈值且所述排气过热度大于或等于第二过热度阈值，则控制减小膨胀阀步数；If in n consecutive cycles, the intake superheat degree is less than or equal to the first superheat degree threshold and the exhaust superheat degree is greater than or equal to the second superheat degree threshold, controlling the step count of the expansion valve to decrease;若在连续n个周期中，所述吸气过热度小于或等于所述第一过热度阈值且所述排气过热度小于所述第二过热度阈值，则输出压缩机驱动故障提示及控制压缩机停机。If in n consecutive cycles, the suction superheat is less than or equal to the first superheat threshold and the exhaust superheat is less than the second superheat threshold, output a compressor drive failure prompt and control compression Machine stops.5.如权利要求4所述的方法，其特征在于，所述吸气过热度为所述压缩机的吸气温度与低压压力对应饱和温度的差值；5. The method of claim 4, wherein the suction superheat is the difference between the suction temperature of the compressor and the corresponding saturation temperature of the low pressure pressure;所述排气过热度为所述压缩机的排气温度与高压压力对应饱和温度的差值。The degree of superheat of the exhaust gas is the difference between the exhaust gas temperature of the compressor and the saturation temperature corresponding to the high pressure pressure.6.如权利要求1所述的方法，其特征在于，所述低频阈值的取值范围为大于或等于1，所述偏差阈值的取值范围为大于等于20且小于或等于30。6 . The method of claim 1 , wherein the value range of the low frequency threshold is greater than or equal to 1, and the value range of the deviation threshold is greater than or equal to 20 and less than or equal to 30. 7 .7.如权利要求2所述的方法，其特征在于，所述第一频率的取值范围为大于等于4且小于或等于8，所述第二频率的取值范围为大于等于1且小于或等于3。7 . The method according to claim 2 , wherein the value range of the first frequency is greater than or equal to 4 and less than or equal to 8, and the value range of the second frequency is greater than or equal to 1 and less than or equal to 8. 8 . equals 3.8.一种空调低温制冷的控制装置，其特征在于，所述装置包括：8. A control device for low-temperature refrigeration of an air conditioner, wherein the device comprises:频率获取模块，用于在低温制冷情况下，获取压缩机的实际运行频率；The frequency acquisition module is used to acquire the actual operating frequency of the compressor in the case of low temperature refrigeration;频率偏差计算模块，用于根据所述实际运行频率及所述压缩机的目标运行频率，计算频率偏差值；a frequency deviation calculation module, configured to calculate a frequency deviation value according to the actual operating frequency and the target operating frequency of the compressor;频率调整模块，用于若在连续多个周期内出现频率低且偏差高状态的次数大于次数阈值，则提高所述目标运行频率；所述频率低且偏差高状态下，所述压缩机的实际运行频率小于或等于低频阈值，且所述频率偏差值大于或等于偏差阈值。A frequency adjustment module, configured to increase the target operating frequency if the number of occurrences of the low frequency and high deviation state in multiple consecutive cycles is greater than the number threshold; under the low frequency and high deviation state, the actual operating frequency of the compressor The operating frequency is less than or equal to the low frequency threshold, and the frequency deviation value is greater than or equal to the deviation threshold.9.一种空调器，其特征在于，包括存储有计算机程序的计算机可读存储介质和处理器，所述计算机程序被所述处理器读取并运行时，实现如权利要求1-7任一项所述的方法。9. An air conditioner, characterized in that it comprises a computer-readable storage medium and a processor stored with a computer program, and when the computer program is read and run by the processor, it realizes any one of claims 1-7. method described in item.10.一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序被处理器读取并运行时，实现如权利要求1-7任一项所述的方法。10. A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the computer program as claimed in any one of claims 1-7 is implemented. method described.

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