Air conditioner control methodTechnical Field
The invention relates to the field of air conditioner operation control, in particular to an air conditioner control method.
Background
Along with the improvement of living standard of people, people rely on the air conditioner more and more, and a plurality of families or office places use the air conditioner to heat in winter or refrigerate in summer. Generally, in the prior art, most air conditioners use collected parameters such as temperature to control the operation frequency of a compressor, the opening degree of an expansion valve, a four-way valve component and the rotating speeds of an internal machine and an external machine, so that the functions of cooling and heating are realized, and whether the comfort level of the indoor environment is stable or not is realized by controlling the response speed of logic.
In the prior art, when an air conditioner operates, a fuzzy control method and a PID control method are mostly adopted when the operation frequency of a compressor, the opening degree of an expansion valve, a four-way valve component and the rotating speeds of an internal machine and an external machine are controlled. However, when the fuzzy control method and the PID control method are adopted for control, the system response time is longer when the whole machine runs. Today when people pursue high-comfort life, the control method cannot be accurately controlled, long time is needed when stability is achieved, and a large number of experiments or experience values are needed for the whole machine when control parameters are formulated.
Based on the above description, a new air conditioner control method is urgently needed to solve the problems that in the prior art, when the whole air conditioner runs, the system response time is long, accurate control cannot be performed, the stability time of an external fan and an expansion valve opening linkage control system is long and easy to fluctuate, the indoor temperature fluctuation caused by rapid change of air conditioner control frequency along with indoor working conditions is poor in comfort, and when control parameters are formulated, a large number of experiments or experience values are needed for the whole air conditioner.
Disclosure of Invention
In view of this, an object of the present invention is to provide an air conditioner control method, which enables a system response time to be short when a complete machine operates, and can quickly enter a stable operation stage, and realize accurate control, so that a few early-stage matching experiments are performed.
The invention also aims to provide an air conditioner control method, which enables the air conditioner to achieve the optimal operation point by self-operation and the whole machine to have higher operation energy efficiency.
The invention further aims to provide an air conditioner control method, which enables an external fan and an expansion valve opening linkage control system to be short in stabilization time and not easy to fluctuate, can realize stable operation of the whole machine by processing interference information, and is small in whole machine oscillation.
The embodiment of the invention adopts the following technical scheme:
an air conditioner control method includes the steps:
s1, detecting the temperature T of the outer pipe of the outdoor unit in real timeOuter tubeOutdoor ambient temperature TOuter ringAnd the discharge temperature T of the compressor during the operation of the air conditionerRow boardSubstituting the detected value into an operation rotating speed function of the outdoor fan to obtain the real-time operation rotating speed of the outdoor fan;
s2, detecting indoor environment temperature T in real timeInner partAnd detecting the indoor ambient temperature TInner partThe outdoor ambient temperature T detected in step S1Outer ringAnd for a predetermined indoor temperature TSetting upTaking the running frequency function of the compressor to obtain the real-time running frequency of the compressor;
s3, detecting the temperature T of the inner pipe of the indoor unit in real timeInner pipeAnd compressor suction temperature TSuction deviceAnd detecting the temperature T of the inner tubeInner pipeCompressor suction temperature TSuction deviceAnd the outdoor ambient temperature T detected in step S1Outer ringAnd compressor discharge temperature TRow boardAnd taking the opening function of the expansion valve to obtain the real-time opening of the expansion valve.
Preferably, in step S1, a function of the operating speed l _ F of the outdoor fan is obtained as;
l_F＝a1(Touter tube-TOuter ring)+b1*TRow board；
Wherein,
parameter a1The main influence factor is the running speed of the outdoor fan;
parameter b1Is a secondary influence factor of the running speed of the outdoor fan.
Preferably, the parameter a1And parameter b1Are obtained by fitting according to experimental data.
Preferably, in step S2, the function of the compressor operating frequency λ _ f is found as:
wherein,
Tsetting upPresetting indoor temperature;
eta is a main influence factor of the running frequency of the compressor;
fcorrectionIs the compressor operating frequency sub-factor.
Preferably, the parameter η and the parameter fCorrectionAre obtained by fitting according to experimental data.
Preferably, in step S3, the expansion valve opening degree λ _ P is obtained as a function of:
wherein,
q is the actual flow of the expansion valve body;
qmthe maximum flow rate of the opening degree of the valve body of the expansion valve.
Preferably, the initial opening degree of the expansion valve is obtained by fitting experimental data.
Preferably, when the operating speed of the outdoor fan is stable, the outdoor unit records the operating speed of the outdoor fan at that time, and the recorded operating speed is used as an initial value of the operating speed of the outdoor fan when the outdoor fan is started in the next similar environment.
The technical scheme provided by the embodiment of the invention has the beneficial technical effects that:
the air conditioner control method provided by the application introduces a neural control method, and the control method controls three parameters, namely the rotating speed of an outdoor fan, the opening of an expansion valve and the running frequency of a compressor, of a household air conditioner in a partitioning manner, but the three parameters are related to each other. Therefore, the method can shorten the system response time when the whole machine operates, can quickly enter a stable operation stage, realizes accurate control and reduces early-stage matching experiments. And the method enables the air conditioner to automatically run to reach the optimal running point, and the running energy efficiency of the whole machine is high. When the working condition fluctuates, the system can react, so that the stability time of the external fan and the expansion valve opening linkage control system is short and the fluctuation is not easy. Because the independent control can not be linked, the stable operation of the whole machine can be realized by processing the interference information, and the vibration is small when the whole machine operates.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a flow chart of air conditioning control provided by the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides an air conditioner control method, which comprises the following steps:
s1, detecting the temperature T of the outer pipe of the outdoor unit in real timeOuter tubeOutdoor ambient temperature TOuter ringAnd the discharge temperature T of the compressor during the operation of the air conditionerRow boardAnd substituting the detected value into the running speed function of the outdoor fan to obtain the real-time running speed of the outdoor fan.
S2, detecting indoor environment temperature T in real timeInner partAnd detecting the indoor ambient temperature TInner partThe outdoor ambient temperature T detected in step S1Outer ringAnd for a predetermined indoor temperature TSetting upAnd substituting the function of the running frequency of the compressor to obtain the real-time running frequency of the compressor.
S3, detecting the temperature T of the inner pipe of the indoor unit in real timeInner pipeAnd compressor suction temperature TSuction deviceAnd detecting the temperature T of the inner tubeInner pipeCompressor suction temperature TSuction deviceAnd the outdoor ambient temperature T detected in step S1Outer ringAnd compressor discharge temperature TRow boardAnd taking the opening function of the expansion valve to obtain the real-time opening of the expansion valve.
Specifically, as shown in fig. 1, the operation speed of the outdoor fan is mainly controlled by the temperature T of the outer pipe of the outdoor unitOuter tubeWith outdoor ambient temperature TOuter ringAnd (5) controlling. And, the outdoor fan will also receive the compressor discharge temperature T when the air conditioner runsRow boardInfluence of so when the compressor discharge temperature is detectedTRow boardWhen the temperature is too high, the outdoor fan can be driven at high speed to reduce the exhaust temperature T of the compressorRow boardTo achieve reliability of the system. Wherein, the function of the running rotating speed l _ F of the outdoor fan is obtained as follows;
l_F＝a1(Touter tube-TOuter ring)+b1*TRow board；
Wherein,
parameter a1The main influence factor is the running speed of the outdoor fan;
parameter b1Is a secondary influence factor of the running speed of the outdoor fan.
Preferably, the parameter a1And parameter b1Are obtained by fitting according to experimental data.
When the outdoor fan starts to work, the detection data, namely the temperature T of the outer pipe of the outdoor unitOuter tubeOutdoor ambient temperature TOuter ringAnd compressor discharge temperature TRow boardAnd (4) carrying in an operation rotating speed function of the outdoor fan, and calculating the operation rotating speed l _ F of the outdoor fan.
In this embodiment, as a preferred scheme, when the operating speed of the outdoor fan reaches the system stability, the outdoor unit may automatically record the operating speed of the outdoor fan at this time, and use the recorded operating speed as an initial value of the operating speed of the outdoor fan when starting up in the next similar environment.
In this embodiment, the temperature T of the outer tube of the outdoor unit is preferably setOuter tubeDetected by a tube temperature sensing bulb arranged on an outdoor side condenser, and the outdoor environment temperature TOuter ringThe detection is carried out by a ring temperature sensing bulb arranged outside the chamber. Compressor discharge temperature TRow boardDetected by a bulb disposed at the compressor discharge pipe. Of course, the outer tube temperature T of the outdoor unitOuter tubeOutdoor ambient temperature TOuter ringAnd compressor discharge temperature TRow boardThe detection device and the detection method of (2) are not limited to these, and detection may be performed by other methods or devicesAnd (6) measuring.
The running frequency of the whole machine is changed along with the change of the load of the indoor unit, but the indoor environment temperature is changed gradually in actual running, so the control method directly adopts the preset indoor temperature TSetting upFor controlling the parameters of the compressor operating frequency, as shown in FIG. 1, from the outdoor ambient temperature TOuter ringAnd presetting the indoor temperature TSetting upDetermining the initial value of the compressor running frequency, and then using the indoor environment temperature TInner partAnd a preset indoor temperature TSetting upAs a correction value for the operating frequency of the compressor, so that the preset indoor temperature T can be quickly achievedSetting upReach the set value and cannot be caused by the indoor environment temperature TInner partThe change of the compressor generates oscillation, so that the energy consumption caused by frequent frequency increase and decrease of the frequency of the compressor is higher, and further, the fluctuation of the indoor temperature is larger, so that the human body is uncomfortable. The function of the compressor operating frequency λ _ f is found as:
wherein,
Tsetting upPresetting indoor temperature;
eta is a main influence factor of the running frequency of the compressor;
fcorrectionIs the compressor operating frequency sub-factor.
The parameter η and the parameter fCorrectionAre obtained by fitting according to experimental data.
In this embodiment, as a preferable scheme, the preset indoor temperature TSetting upThe remote controller directly sets the value.
In summary, the control process of the compressor operation frequency is as follows: after the outdoor fan is started, the outdoor environment temperature T is measuredOuter ringAnd presetting the indoor temperature TSetting upCalculating the initial optimum of the compressor by taking the function of the running frequency lambda _ f of the compressorFrequency according to ambient temperature T in the roomInner partAnd presetting the indoor temperature TSetting upThe frequency is finely adjusted according to the change rate of the difference value, so that the fluctuation of the indoor temperature caused by quick rise and quick fall is prevented.
The opening degree of the expansion valve is controlled from the start of the operation of the compressor, and the initial control opening degree of the expansion valve is obtained by fitting according to experimental data. As shown in fig. 1, the operation opening degree of the expansion valve is based on the suction temperature T of the compressorSuction deviceAnd inner tube temperature TInner pipeAnd the outdoor ambient temperature T detected in step S1Outer ringAnd compressor discharge temperature TRow boardAnd (4) determining. Detecting the outdoor ambient temperature TOuter ringCompressor discharge temperature TRow boardCompressor suction temperature TSuction deviceAnd inner tube temperature TInner pipeCalculating by taking into a function of the opening lambda _ P of the expansion valveSuction deviceAnd inner tube temperature TInner pipeRate of change of (1), compressor discharge temperature TRow boardWith outdoor ambient temperature TOuter ringThe change rate of the expansion valve is linked to control the operation curve of the expansion valve to be adjusted in real time, so that the system automatically reaches the optimal operation state. The function of the expansion valve opening degree lambda _ P is obtained as follows:
wherein,
q is the actual flow of the expansion valve body;
qmthe maximum flow rate of the opening degree of the valve body of the expansion valve.
The control method controls the real-time running frequency of the compressor, the real-time running rotating speed of the outdoor fan and the real-time opening degree of the expansion valve in an algorithm mode, but the exhaust temperature T of the compressorRow boardThe indoor ambient temperature T is a little related to the real-time running rotating speed of the outdoor fan and the real-time running frequency of the compressorInner partHas close relation with the real-time running rotating speed of the outdoor fan and the real-time running frequency of the compressorThus, the whole control system adjusts the operation of the related components by taking the constant or relatively stable parameters as the dominant determination factors (the real-time running frequency of the compressor is adjusted by the outdoor ambient temperature TOuter ringAnd presetting the indoor temperature TSetting upControlling the real-time running speed of the outdoor fan to be controlled by the temperature T of the outer pipe of the outdoor unitOuter tubeWith outdoor ambient temperature TOuter ringThe difference value is controlled, and the real-time opening degree of the expansion valve is controlled by the exhaust temperature T of the compressorRow boardWith outdoor ambient temperature TOuter ringDifference control). Therefore, the system can stably and quickly reach the target set temperature in the early stage to realize the functions of refrigeration and heating, the whole machine can stably run due to the addition of the revision coefficient, the parameters are revised according to the reference of the result of the upper section algorithm in the calculation of the neural control method to achieve the optimal running combination, and the intelligent adjustment of the air conditioner can be realized only by finding the value of the correlation coefficient in the whole early-stage test.
In the embodiment, the parameters of the optimal operation point are memorized every time when the three are in linkage control and are used as the adjustment of the next operation, so that the previous memorized data is used as the reference to carry out quick adjustment every time the temperature of the thermal bulb changes, and the whole machine quickly reaches a stable state.
According to the scheme, a neural control method is introduced, and three parameters of real-time operation frequency of a compressor, real-time operation rotating speed of an outdoor fan and real-time opening degree of an expansion valve related to the household air conditioner are controlled in a blocking mode, but are related to each other. Therefore, the whole machine can quickly enter stable operation, can react when the working condition fluctuates, and can not be linked due to independent control so that the whole machine has small vibration during operation.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.