CN111520894A - Output control method and device for air conditioner compressor, air conditioner and storage medium - Google Patents
Output control method and device for air conditioner compressor, air conditioner and storage medium Download PDFInfo
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- CN111520894A CN111520894A CN202010628989.6A CN202010628989A CN111520894A CN 111520894 A CN111520894 A CN 111520894A CN 202010628989 A CN202010628989 A CN 202010628989A CN 111520894 A CN111520894 A CN 111520894A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
Abstract
The invention provides an output control method and device of an air conditioner compressor, an air conditioner and a storage medium, wherein the output control method of the air conditioner compressor comprises the following steps: acquiring high pressure and low pressure of an air conditioner; determining a pressure ratio based on the high pressure and the low pressure; when the pressure ratio is greater than a first preset ratio, reducing the frequency of the compressor; after the frequency of the compressor is reduced, when the pressure ratio is smaller than or equal to a second preset ratio, if the air conditioner is judged to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, the frequency of the compressor is reduced, wherein the second preset ratio is smaller than or equal to the first preset ratio. The invention is based on the coupling control of high pressure, low pressure and pressure ratio, avoids the excessive frequency adjustment of the compressor and improves the operation reliability of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioner control, in particular to an output control method and device of an air conditioner compressor, an air conditioner and a storage medium.
Background
Existing inverter air conditioners can adjust the compressor capacity output as a function of room load demand. When the room load demand is large, the system improves the frequency of the compressor, so that enough heat or cold can enter the room, the comfort of a user is ensured, and when the room load demand is small, the system reduces the frequency of the compressor, so that the comfort of the user is ensured, and meanwhile, the power consumption is saved. The compressor needs a proper pressure range for stable and reliable operation, the high pressure and the low pressure of the air conditioning system change along with the change of the frequency of the compressor, when the frequency of the compressor is continuously increased, the high pressure is continuously increased, and the low pressure is continuously reduced, which possibly exceeds the set safe pressure range of the system. Therefore, a corresponding compressor frequency control is required based on the high and low pressures of the air conditioning system.
However, the prior art compressor frequency control based on high and low pressures has the problems of poor effect, excessive adjustment and repeated fluctuation.
Disclosure of Invention
The invention solves the problems of poor effect, excessive adjustment and repeated fluctuation of the frequency control of the compressor based on high pressure and low pressure in the prior art.
In order to solve the above problems, the present invention provides an output control method for an air conditioner compressor, comprising:
acquiring high pressure and low pressure of an air conditioner;
determining a pressure ratio based on the high pressure and the low pressure;
when the pressure ratio is greater than a first preset ratio, reducing the frequency of the compressor;
after the frequency of the compressor is reduced, when the pressure ratio is smaller than or equal to a second preset ratio, if the air conditioner is judged to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, the frequency of the compressor is reduced, wherein the second preset ratio is smaller than or equal to the first preset ratio.
Through pressure ratio and high pressure, the frequency of low pressure coupling control compressor, can avoid adjusting excessively, the problem of fluctuation repeatedly, make the air conditioner operation more steady, simultaneously, compare with high pressure/low pressure control, pressure ratio control reaches the guard value more easily, the pressure state that enables the air conditioner falls into safety range sooner, consequently, set up pressure ratio control before high pressure/low pressure correction control, can protect the air conditioner more fast, simultaneously, pressure ratio control also can indirectly adjust high pressure/low pressure, reduce the abominable degree of high low pressure state, follow-up solitary high pressure or low pressure correction control can be removed from even, operating resources are saved, the simplified control.
Optionally, if it is determined to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, reducing the frequency of the compressor includes:
when the air conditioner operates in a heating mode, if it is determined to enter low pressure correction control based on the low pressure, reducing the frequency of the compressor based on the low pressure;
when the air conditioner operates in a cooling mode, if it is determined to enter a high pressure correction control based on the high pressure, the frequency of the compressor is reduced based on the high pressure.
Whether the corresponding correction control is carried out or not is judged through the high pressure or the low pressure so as to protect the reliability of the compressor and avoid exceeding the permitted range of the compressor.
Optionally, if it is determined to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, reducing the frequency of the compressor further includes:
when the low-pressure correction control is judged to be started, calculating a first frequency reduction amplitude at intervals of a first preset time length based on the difference value of the low-pressure and a preset target low pressure and a low-pressure correction coefficient, and controlling the compressor to reduce the frequency by the first frequency reduction amplitude;
and when the high-pressure correction control is judged to be started, calculating a second frequency reduction amplitude at intervals of a second preset time based on the difference value between the high-pressure and a preset target high pressure and the high-pressure correction coefficient, and controlling the compressor to reduce the frequency by the second frequency reduction amplitude.
Through the steps, the target low-voltage control and the target high-voltage control are respectively realized, and the effect of the air conditioner is ensured while the reliable operation of the air conditioner is ensured.
Optionally, the low pressure correction coefficient is in a negative correlation with the low pressure, and the high pressure correction coefficient is in a negative correlation with the high pressure. The reliability of the compressor can be ensured, the maximum output of the compressor is kept, and the capacity is improved.
Optionally, after reducing the frequency of the compressor when the pressure ratio is greater than a first preset ratio, the method further includes: when the pressure ratio is smaller than or equal to a second preset ratio, the air conditioner operates in a heating mode, and the low-pressure is smaller than or equal to a first preset low pressure, the low-pressure correction control is judged to be started; and when the pressure ratio is smaller than or equal to a second preset ratio, the air conditioner operates in a refrigeration mode, and the high-pressure is larger than a first preset high pressure, judging to enter high-pressure correction control.
When the low pressure is too low during heating and the high pressure is too high during refrigeration, corresponding low pressure or high pressure correction control is carried out so as to ensure the reliability of the air conditioner and maintain the stable operation of the air conditioner.
Optionally, if it is determined to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, after reducing the frequency of the compressor, the method further includes:
when the air conditioner is in the low pressure correction control, if the low pressure is greater than a second preset low pressure, the low pressure correction control is quitted, and the frequency of the compressor is controlled based on a target high pressure, wherein the second preset low pressure is greater than or equal to the first preset low pressure;
and when the air conditioner is in the high-pressure correction control, if the high-pressure is less than or equal to a second preset high pressure, the high-pressure correction control is quitted, and the frequency of the compressor is controlled based on the target low-pressure, wherein the second preset high pressure is less than or equal to the first preset high pressure.
Whether the reliability of the compressor meets the requirement is judged through low pressure/high pressure, and when the reliability of the compressor meets the requirement, normal pressure control is recovered, the refrigerating capacity/heating capacity is improved, and the effect is guaranteed.
Optionally, when the pressure ratio is greater than a first preset ratio, reducing the frequency of the compressor includes:
and when the pressure ratio is greater than the first preset ratio, controlling the compressor to reduce the frequency at a preset amplitude on the basis of the current compressor frequency at intervals of a third preset time.
The compressor is controlled to reduce the frequency by the preset amplitude based on the current compressor frequency, so that the proper preset amplitude can be conveniently selected, the output of the compressor is ensured to be adjusted in time, the reliable operation of the air conditioner is further ensured in time, and meanwhile, the condition that the air conditioning system has control fluctuation due to overlarge amplitude is also avoided.
Optionally, after determining the pressure ratio according to the high pressure and the low pressure, the method further includes: and when the pressure ratio is smaller than or equal to the first preset ratio, executing the step of reducing the frequency of the compressor if the air conditioner is judged to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure.
When the frequency does not need to be reduced based on the pressure ratio, whether the frequency of the compressor needs to be reduced is further judged based on the high-pressure or the low-pressure, so that the system pressure is better stabilized in a proper pressure range, and the reliability of the compressor is improved.
The present invention also provides an output control device of an air conditioner compressor, comprising:
an acquisition unit for acquiring a high pressure and a low pressure of the air conditioner;
the processing unit is used for determining a pressure ratio according to the high pressure and the low pressure and judging whether the pressure ratio is larger than a first preset ratio or not;
a control unit for reducing the frequency of the compressor when the pressure ratio is greater than the first preset ratio;
the processing unit is further used for judging whether to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure when the pressure ratio is smaller than or equal to a second preset ratio after the frequency of the compressor is reduced;
the control unit is also configured to decrease the frequency of the compressor when it is determined to enter the corresponding pressure correction control.
The advantages of the output control device of the air conditioner compressor over the prior art are similar to the output control method of the air conditioner compressor, and are not repeated here.
The invention also provides an air conditioner, which comprises a processor and a computer readable storage medium storing a computer program, wherein the computer program is read by the processor and runs on the processor to realize the output control method of the air conditioner compressor. The advantages of the air conditioner over the prior art are similar to the output control method of the air conditioner compressor, and are not described herein again.
The present invention also provides a computer-readable storage medium storing a computer program, which when read and executed by a processor, implements the output control method of the air conditioner compressor as described in any one of the above. The advantages of the computer readable storage medium over the prior art are similar to the output control method of the air conditioner compressor, and are not described herein again.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an output control method for an air conditioner compressor according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of step S40 of the output control method for air conditioner compressor according to the present invention;
FIG. 3 is a schematic diagram illustrating an embodiment of an output control method of the compressor of the air conditioner in a heating operation mode;
FIG. 4 is a schematic diagram illustrating another embodiment of an output control method of a compressor of an air conditioner in a cooling operation mode;
FIG. 5 is a schematic view of an embodiment of an output control device for a compressor of an air conditioner according to the present invention;
FIG. 6 is a schematic view of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
1 gas-liquid separator; 2-a compressor; 3-an electromagnetic valve; 4-a capillary tube; 5-a filter; 6-high pressure switch; 7-an oil separator; 8-a high-pressure sensor; 9-an outdoor heat exchanger; 10-a low pressure sensor; 11-a four-way valve; 12-indoor heat exchanger; 13-a gas pipe stop valve; 14-a first electronic expansion valve; 15-liquid pipe stop valve; 16-second electronic expansion valve.
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.
The invention provides an output control method of an air conditioner compressor. FIG. 1 is a schematic diagram of an embodiment of an output control method for an air conditioner compressor according to the present invention. As shown in fig. 1, the output control method of the air conditioner compressor includes:
step S10, acquiring high pressure and low pressure of the air conditioner;
the high pressure and the low pressure can be obtained by providing a pressure sensor at a corresponding position of a corresponding pipeline of the air conditioner to directly detect the high pressure and the low pressure by the pressure sensor, and optionally, the high pressure sensor is provided at an oil separation outlet and the low pressure sensor is provided after the four-way valve and before the oil enters the gas-liquid separator.
The output control method of the air conditioner compressor can be suitable for an air conditioner without a high pressure sensor or a low pressure sensor, and can be applied to a low-cost air conditioner for corresponding control. Alternatively,
in the refrigeration process, the high-pressure is = [ exp (22.24929-2348.18978/(middle temperature sensing bulb of condenser +271.3034))/100] Mpa,
low pressure = [ exp (22.24929-2348.18978/(evaporator middle bulb +271.3034))/100] Mpa;
in heating, high pressure = [ exp (22.24929-2348.18978/(evaporator middle temperature sensing bulb +271.3034))/100] Mpa,
low-pressure = [ exp (22.24929-2348.18978/(mid-condenser bulb +271.3034))/100] Mpa.
When the output control method of the air conditioner compressor is suitable for a multi-split air conditioner, the temperature sensing bulb in the middle of the evaporator is the average value of the internal machines which are started to run because the number of the internal machines is multiple.
Step S20, determining a pressure ratio according to the high pressure and the low pressure;
when the air conditioner normally operates, the air conditioner operates according to a normal pressure control scheme (when the air conditioner operates in a heating mode, the air conditioner operates according to normal target high pressure control, and when the air conditioner operates in a refrigerating mode, the air conditioner operates according to normal target low pressure control), a pressure ratio is determined in real time based on the high pressure and the low pressure, and whether the pressure ratio is larger than a first preset ratio or not is judged according to the size of the pressure ratio. The compressor has the advantages that the pressure ratio is high-pressure ratio and low-pressure ratio, namely the high-pressure is a numerator and the low-pressure is a denominator, the pressure ratio is relatively large in relation to the reliability of the compressor, the compressor is poor in rotating balance and prone to step failure due to the fact that the pressure ratio is too large, compressors of different models and specifications have different maximum pressure ratio safety thresholds, and the first preset ratio can be equal to the maximum pressure ratio safety threshold of the compressor. The first predetermined ratio may be selected to be 8.
When the pressure ratio is smaller than or equal to the first preset ratio, it is further determined whether the frequency of the compressor needs to be adjusted based on the high pressure or the low pressure alone, optionally, when the pressure ratio is smaller than or equal to the first preset ratio, if it is determined to enter the corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure in step S40, the frequency of the compressor is reduced, and the related explanation is as the explanation of step S40, which is not repeated herein. When the frequency is not required to be reduced based on the pressure ratio, whether the frequency of the compressor is required to be reduced is further judged based on the high-pressure or the low-pressure, so that the system pressure is stabilized in a proper pressure range better, the reliability of the compressor is improved, and the stable operation of the compressor is ensured.
Step S30, when the pressure ratio is larger than a first preset ratio, reducing the frequency of the compressor;
when the pressure ratio is larger than the first preset ratio, the reliability of the air conditioner is not satisfied, and at the moment, the frequency of the compressor needs to be reduced to reduce the pressure ratio.
Optionally, the reducing the frequency of the compressor specifically includes: the compressor frequency is reduced at a preset rate, for example, by 10HZ every 20 seconds.
Optionally, when the pressure ratio is greater than a first preset ratio, reducing the frequency of the compressor includes: and when the pressure ratio is greater than the first preset ratio, controlling the compressor to reduce the frequency at a preset amplitude on the basis of the current compressor frequency at intervals of a third preset time.
Wherein, the third preset time period can be selected to be 10-40 seconds.
The preset amplitude may be a preset percentage of the current compressor frequency, and the preset percentage is a threshold value preset in the air conditioner. For example, if the preset percentage is 5%, the preset amplitude is 5% of the current frequency. In one embodiment, the decrease in frequency is 5% per 30s interval based on the existing frequency, which is formulated as follows:
wherein the content of the first and second substances,
in order to achieve a reduced compressor frequency,
is the current compressor frequency.
The compressor is controlled to reduce the frequency by the preset amplitude based on the current compressor frequency, so that the proper preset amplitude can be conveniently selected, the output of the compressor is ensured to be adjusted in time, the reliable operation of the air conditioner is further ensured in time, and meanwhile, the condition that the air conditioning system has control fluctuation due to overlarge amplitude is also avoided.
Step S40, after reducing the frequency of the compressor, when the pressure ratio is smaller than or equal to a second preset ratio, if it is determined to enter a corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, the frequency of the compressor is reduced, where the second preset ratio is smaller than or equal to the first preset ratio.
Wherein the second preset ratio is less than or equal to the first preset ratio, optionally, the second preset ratio = the first preset ratio-1.
After the frequency of the compressor is controlled to be reduced based on the pressure ratio, the high pressure is reduced, the low pressure is increased, the pressure ratio is reduced, when the pressure ratio is reduced to a certain value, the pressure ratio control is quitted, and the next step of control is switched to: whether to enter the corresponding pressure correction control is determined based on the high pressure or the low pressure.
The operation mode of the air conditioner includes a cooling operation mode and a heating operation mode.
When the air conditioner operates in a heating mode, whether low-pressure correction control is entered is judged based on low-pressure, namely whether the frequency of the compressor is corrected based on the low pressure, and if so, the frequency of the compressor is reduced based on the low-pressure. Optionally, after the step S30, when the pressure ratio is smaller than or equal to a second preset ratio after reducing the frequency of the compressor, and when the air conditioner operates in the heating mode and the low pressure is smaller than or equal to a first preset low pressure, it is determined to enter the low pressure correction control. During heating, after exiting pressure ratio control, acquiring low-pressure in real time, comparing the low-pressure with a first preset low pressure (the value range of the first preset low pressure can be selected to be the lowest pressure plus (1 bar-2 bar) of the compressor, and if the lowest pressure is 1.8bar, the value range of the first preset low pressure is 2.8 bar-3.8 bar), when the low-pressure is smaller than or equal to the first preset pressure, reducing the frequency of the compressor, namely entering low-pressure correction control, changing the target high-pressure control into low-pressure control, and correcting the frequency of the compressor based on the low-pressure to protect the reliability of the compressor and avoid exceeding the allowable range of the compressor. Optionally, after entering low pressure correction control and reducing the frequency of the compressor based on low pressure is determined, when the air conditioner is in the low pressure correction control, if the low pressure is greater than a second preset low pressure, the low pressure correction control is exited, and the frequency of the compressor is controlled based on a target high pressure, wherein the second preset low pressure is greater than or equal to the first preset low pressure, and when the second preset low pressure is greater than the first preset low pressure, a value range of the second preset low pressure may be selected as the compressor lowest pressure + (3 bar-4 bar), and if the lowest pressure is 1.8bar, a value range of the second preset low pressure is 4.8 bar-5.8 bar, and at this time, the reliability of the surface compressor meets the requirement, normal control can be resumed, the target high pressure control is switched to, the heating amount is improved, and the heating effect is ensured.
When the air conditioner operates in a cooling mode, whether to enter high pressure correction control, that is, whether to correct the frequency of the compressor based on high pressure is judged based on high pressure, and if so, the frequency of the compressor is reduced based on high pressure. Optionally, after the step S30, when the pressure ratio is less than or equal to a second preset ratio after the frequency of the compressor is decreased, and when the air conditioner operates in the cooling mode and the high pressure is greater than a first preset high pressure, it is determined that the high pressure correction control is entered. During refrigeration, after exiting pressure ratio control, acquiring high pressure in real time, comparing the high pressure with a first preset high pressure (the value range of the first preset high pressure can be selected as the maximum operation high pressure of the compressor- (2 bar-4 bar), when the maximum operation high pressure of the compressor is 40bar, the value range of the first preset high pressure is 36 bar-38 bar), and when the high pressure is larger than the first preset high pressure, reducing the frequency of the compressor, namely entering high pressure correction control, changing the target low pressure control into the high pressure control, and correcting the frequency of the compressor based on the high pressure, so that the reliability of the compressor is protected, and the condition that the compressor exceeds the allowable range of the compressor is avoided. Optionally, after it is determined that high-pressure correction control is entered, the frequency of the compressor is reduced based on high-pressure, when the air conditioner is in the high-pressure correction control, if the high-pressure is less than or equal to a second preset high pressure, the high-pressure correction control is exited, the frequency of the compressor is controlled based on target low-pressure, wherein the second preset high pressure is less than or equal to a first preset high pressure, when the second preset high pressure is less than the first preset high pressure, a value range of the second preset high pressure may be a maximum operation high pressure- (9 bar-12 bar) of the compressor, when the maximum operation high pressure of the compressor is 40bar, a value range of the first preset high pressure is 28 bar-31 bar, at this time, the reliability of the compressor can be restored, normal target low-pressure control is achieved, the refrigerating capacity is increased, and the refrigerating effect is ensured.
In the above high-pressure or low-pressure correction control, the air conditioner has a priority on reliability as a control target, and when the reliability is satisfactory during cooling operation, the air conditioner has a low pressure as a control target to ensure a cooling effect, and when the high pressure is too high and the reliability is not satisfactory, the air conditioner is switched to have a high pressure as a control target to ensure that the air conditioner satisfies the reliability requirement, and when the reliability is satisfactory during heating operation, the air conditioner has a high pressure as a control target to ensure a heating effect, and when the low pressure is too low, the air conditioner is switched to have a low pressure as a control target to ensure that the air conditioner satisfies the reliability requirement. Through the control, the air conditioner can be effectively prevented from being shut down under the protection of overhigh high voltage or excessively low voltage, and can also be operated towards the target low voltage or the target high voltage in a short time after the air conditioner is started, so that the quick refrigeration or heating is realized, and the reliability of the system is ensured while the performance of the system is improved.
The pressure ratio, the high pressure and the low pressure are reliability factors of the compressor, any one of the pressure ratio, the high pressure and the low pressure exceeds an allowable range, the rotating balance of the compressor can be affected, step-out risks or abrasion risks occur, in conventional control, the high pressure protection control, the low pressure protection control and the pressure ratio protection control are independent, and actually, the pressure ratio is related to the high pressure and the low pressure, so that the same parameter (the frequency of the compressor) is controlled by multiple targets, and the problems of excessive regulation, repeated fluctuation and the like exist.
The invention controls the frequency of the compressor by coupling the pressure ratio with high pressure and low pressure, can avoid the problems of excessive adjustment and repeated fluctuation, and enables the air conditioner to operate more stably, meanwhile, compared with high pressure/low pressure control, the pressure ratio control can reach a protection value more easily, and the pressure state of the air conditioner can fall into a safety range more quickly, therefore, the pressure ratio control is arranged before the high pressure/low pressure correction control, the air conditioner can be protected more quickly, meanwhile, the pressure ratio control can also adjust the high pressure/low pressure indirectly, the severity of the high pressure and low pressure state is reduced, even the subsequent independent high pressure or low pressure correction control can be omitted, the operation resources are saved, and the control is simplified.
Alternatively, as shown in fig. 2, if it is determined in step S40 that the corresponding pressure correction control is to be entered according to the current operation mode of the air conditioner, the high pressure and the low pressure, the reducing the frequency of the compressor includes:
step S41, when the low pressure correction control is judged to be started, calculating a first frequency reduction amplitude at intervals of a first preset time based on the difference value between the low pressure and a preset target low pressure and a low pressure correction coefficient, and controlling the compressor to reduce the frequency by the first frequency reduction amplitude;
optionally, the first down-conversion amplitude is calculated based on a first preset formula, where the first preset formula is:
wherein the content of the first and second substances,
for the purpose of this compressor frequency at the moment,
is the frequency of the compressor at the previous moment,
to correct the compressor frequency based on the low pressure calculation,
in order to correct the coefficient for the frequency of the compressor,
time and
the time intervals are a first preset time length.
The first preset time can be 20 seconds, and the preset target low pressure can be 6-7 bar.
Optionally, the low pressure correction factor is a fixed preset value.
Optionally, the low pressure correction factor is inversely related to the low pressure. The low pressure here refers to the currently actually measured low pressure, in one embodiment, the lower the measured low pressure is, the larger the low pressure correction coefficient is, in another embodiment, the lower the measured low pressure is, the larger the corresponding low pressure correction coefficient is, for example, when Ps1 < PsMeasured in factWhen the pressure is less than or equal to Ps2, the value range of the low-pressure correction coefficient is 2-3, and when the pressure is PsMeasured in factAnd when the pressure is less than or equal to Ps1, the value range of the low-pressure correction coefficient is 3-5.
And step S42, when the high-pressure correction control is judged to be started, calculating a second frequency reduction amplitude at intervals of a second preset time based on the difference value between the high-pressure and a preset target high pressure and the high-pressure correction coefficient, and controlling the compressor to reduce the frequency at the second frequency reduction amplitude.
Optionally, the second down-conversion amplitude is calculated based on a second preset formula, where the second preset formula is:
Optionally, when the normal operating pressure of the compressor is 31bar (at this time, the energy efficiency/capacity reaches the optimal balance), the preset target high pressure value range is 30 bar-33 bar.
Optionally, the high-pressure correction factor is a fixed preset value.
Optionally, the high pressure correction factor is associated with the high pressureThe forces are inversely related. The high pressure here refers to the currently actually measured high pressure, and for the positive correlation between the high pressure correction coefficient and the actually measured high pressure, in one embodiment, the higher the actually measured high pressure is, the larger the high pressure correction coefficient is, and in another embodiment, the higher the value range of the actually measured high pressure is, the larger the corresponding high pressure correction coefficient is, for example, when Pd2 is not more than Pd, the higher the corresponding high pressure correction coefficient is, for example, when Pd2 is not more than PdMeasured in factWhen the pressure is less than Pd1, the value range of the high-pressure correction coefficient is 2-3, and when Pd is less than Pd1Measured in factAnd when the pressure is not less than Pd1, the value range of the high-pressure correction coefficient is 4-5.
The low-pressure correction coefficient and the low-pressure correction coefficient are in a negative correlation relationship, and the high-pressure correction coefficient are in a negative correlation relationship, so that the reliability of the compressor can be ensured, the maximum output of the compressor is kept, and the capacity is improved.
And calculating a first frequency reduction amplitude based on the difference value between the actually measured low-pressure and the preset target low pressure and the low-pressure correction coefficient, and controlling the compressor to reduce the frequency by the first frequency reduction amplitude, so that the target low-pressure control can be realized, the frequency output of the compressor is reduced to the maximum output in a safe low-pressure range, and the effect of the air conditioner is ensured while the reliable operation of the air conditioner is ensured.
And calculating a second frequency reduction amplitude based on the difference value between the actually measured high-pressure and the preset target high pressure and the high-pressure correction coefficient, and controlling the compressor to reduce the frequency by the second frequency reduction amplitude, so that target high-pressure control can be realized, the frequency output of the compressor is reduced to the maximum output within a safe high-pressure range, and the effect of the air conditioner is ensured while the reliable operation of the air conditioner is ensured.
Alternatively, to facilitate understanding of the present invention, an embodiment as shown in fig. 3 and 4 is given. Fig. 3 is a schematic view illustrating an embodiment of an output control method of the air conditioner compressor in a heating operation mode, and fig. 4 is a schematic view illustrating another embodiment of the output control method of the air conditioner compressor in a cooling operation mode.
As shown in fig. 3, during heating operation, according to normal target high-pressure control, and real-time judging whether the measured high-low pressure ratio value Pd/Ps > a preset high-low pressure ratio a, if yes, entering compressor frequency-pressure ratio regulation control, decreasing the compressor frequency by 5% on the basis of the existing frequency every period (e.g. 30 s), until the measured high-low pressure ratio value Pd/Ps is less than or equal to the preset high-low pressure ratio a-1, exiting pressure ratio control, entering next step control, if not, directly entering next step control; the next control comprises the following steps: judging whether the actually measured low pressure Ps is less than or equal to a first preset low pressure Ps1, if the Ps is less than or equal to a second preset low pressure Ps1, entering the low pressure correction control of the compressor frequency, calculating and adjusting the compressor frequency according to the low pressure until the actually measured low pressure Ps is greater than the second preset low pressure Ps2, exiting the correction control of the compressor, and recovering to the normal target high pressure control, and if the Ps is less than or equal to a third preset low pressure Ps1, directly recovering to the normal target high pressure control.
As shown in fig. 4, during the cooling operation, according to the normal target low-pressure control, and determining whether the measured high-low pressure ratio value Pd/Ps > the preset high-low pressure ratio a in real time, if yes, entering the compressor frequency pressure ratio regulation control, calculating and regulating the compressor frequency according to the low pressure, wherein the compressor frequency decreases by 5% on the basis of the existing frequency in each period until the measured high-low pressure ratio value Pd/Ps is less than or equal to the preset high-low pressure ratio a-1, exiting the pressure ratio control, entering the next step of control, and if not, directly entering the next step of control; the next control comprises the following steps: judging whether the actually measured high pressure Pd is larger than the first preset high pressure Pd1, if the Pd is larger than the Pd1, entering the compressor frequency high pressure correction control, calculating and adjusting the compressor frequency according to the high pressure until the actually measured high pressure Pd is smaller than the second preset high pressure Pd2, exiting the compressor correction control, and recovering to the normal target low pressure control, and if the Pd is not larger than the Pd1, directly recovering to the normal target low pressure control.
The invention also provides an output control device of the air conditioner compressor. Fig. 5 is a schematic view of an embodiment of an output control device of an air conditioner compressor according to the present invention, and as shown in fig. 5, the output control device of the air conditioner compressor includes:
an acquisition unit 101 for acquiring a high pressure and a low pressure of the air conditioner;
a processing unit 102 for determining a pressure ratio from the high pressure and the low pressure;
a control unit 103 for reducing the frequency of the compressor when the pressure ratio is greater than a first preset ratio;
the control unit 103 is further configured to, after reducing the frequency of the compressor, when the pressure ratio is smaller than or equal to a second preset ratio, if it is determined to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, reduce the frequency of the compressor, where the second preset ratio is smaller than or equal to the first preset ratio.
Optionally, the control unit 103 is further configured to, when the air conditioner operates in a heating mode, decrease the frequency of the compressor based on the low pressure if it is determined to enter low pressure correction control based on the low pressure; when the air conditioner operates in a cooling mode, if it is determined to enter a high pressure correction control based on the high pressure, the frequency of the compressor is reduced based on the high pressure.
Optionally, the control unit 103 is further configured to calculate a first frequency reduction amplitude at intervals of a first preset time based on a difference between the low-pressure and a preset target low pressure and a low-pressure correction coefficient, and control the compressor to reduce the frequency by the first frequency reduction amplitude when it is determined that the low-pressure correction control is entered; and when the high-pressure correction control is judged to be started, calculating a second frequency reduction amplitude at intervals of a second preset time based on the difference value between the high-pressure and a preset target high pressure and the high-pressure correction coefficient, and controlling the compressor to reduce the frequency by the second frequency reduction amplitude.
Optionally, the low pressure correction coefficient is in a negative correlation with the low pressure, and the high pressure correction coefficient is in a negative correlation with the high pressure.
Optionally, the processing unit 102 is further configured to determine to enter a low pressure correction control when the pressure ratio is smaller than or equal to a second preset ratio and the air conditioner operates in a heating mode after reducing the frequency of the compressor, and the low pressure is smaller than or equal to a first preset low pressure; and when the pressure ratio is smaller than or equal to a second preset ratio, the air conditioner operates in a refrigeration mode, and the high-pressure is larger than a first preset high pressure, judging to enter high-pressure correction control.
Optionally, the processing unit 102 is further configured to, when the air conditioner is in the low pressure correction control, exit the low pressure correction control if the low pressure is greater than a second preset low pressure, and control the frequency of the compressor based on a target high pressure, where the second preset low pressure is greater than or equal to the first preset low pressure; and when the air conditioner is in the high-pressure correction control, if the high-pressure is less than or equal to a second preset high pressure, the high-pressure correction control is quitted, and the frequency of the compressor is controlled based on a target low-pressure, wherein the second preset high pressure is less than or equal to the first preset high pressure.
Optionally, the control unit 103 is further configured to control the compressor to reduce the frequency by a preset amplitude on the basis that the current compressor frequency is maintained at a third preset time interval when the pressure ratio is greater than the first preset ratio.
Optionally, the control unit 103 is further configured to, after determining a pressure ratio according to the high pressure and the low pressure, execute the step of reducing the frequency of the compressor if it is determined to enter the corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure when the pressure ratio is smaller than or equal to the first preset ratio.
The advantages of the output control device of the air conditioner compressor over the prior art are similar to the output control method of the air conditioner compressor, and are not repeated here.
The invention also provides an air conditioner. Fig. 6 is a schematic diagram of an embodiment of an air conditioner according to the present invention, which includes a processor 202 and a computer-readable storage medium 201 storing a computer program, wherein the computer program is read by the processor 202 and executed to implement the output control method of the air conditioner compressor according to any one of the above aspects.
The advantages of the air conditioner over the prior art are similar to the output control method of the air conditioner compressor, and are not described herein again.
Alternatively, fig. 7 is a schematic diagram of an embodiment of the air conditioner structure of the present invention, and as shown in fig. 7, the air conditioner includes a gas-liquid separator 1, a compressor 2, a solenoid valve 3, a capillary tube 4, a filter 5, a high pressure switch 6, an oil separator 7, a high pressure sensor 8, an outdoor heat exchanger 9, a low pressure sensor 10, a four-way valve 11, an indoor heat exchanger 12, a gas tube cut-off valve 13, a first electronic expansion valve 14, a liquid tube cut-off valve 15, and a second electronic expansion valve 16, wherein the high pressure sensor 8 is disposed at an oil outlet, and the low pressure sensor 10 is disposed after the four-way valve 11 and before. Fig. 7 is a schematic diagram of an air conditioning system to which the method for controlling the output of the air conditioner compressor 2 according to the present invention is applicable, and those skilled in the art will appreciate that the method for controlling the output of the air conditioner compressor 2 according to the present invention can also be applied to other air conditioning systems.
The invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the computer program realizes the output control method of the air conditioner compressor. The advantages of the computer readable storage medium over the prior art are similar to the output control method of the air conditioner compressor, and are not described herein again.
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 (11)
1. An output control method of an air conditioner compressor is characterized by comprising the following steps:
acquiring high pressure and low pressure of an air conditioner;
determining a pressure ratio based on the high pressure and the low pressure;
when the pressure ratio is greater than a first preset ratio, reducing the frequency of the compressor;
after the frequency of the compressor is reduced, when the pressure ratio is smaller than or equal to a second preset ratio, if the air conditioner is judged to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, the frequency of the compressor is reduced, wherein the second preset ratio is smaller than or equal to the first preset ratio.
2. The output control method of an air conditioner compressor as claimed in claim 1, wherein the reducing the frequency of the compressor if entering the corresponding pressure correction control is determined according to the current operation mode of the air conditioner and the high pressure and the low pressure comprises:
when the air conditioner operates in a heating mode, if it is determined to enter low pressure correction control based on the low pressure, reducing the frequency of the compressor based on the low pressure;
when the air conditioner operates in a cooling mode, if it is determined to enter a high pressure correction control based on the high pressure, the frequency of the compressor is reduced based on the high pressure.
3. The output control method of an air conditioner compressor according to claim 1 or 2, wherein if it is determined to enter the corresponding pressure correction control according to the current operation mode of the air conditioner and the high pressure and the low pressure, the reducing the frequency of the compressor further comprises:
when the low-pressure correction control is judged to be started, calculating a first frequency reduction amplitude at intervals of a first preset time length based on the difference value of the low-pressure and a preset target low pressure and a low-pressure correction coefficient, and controlling the compressor to reduce the frequency by the first frequency reduction amplitude;
and when the high-pressure correction control is judged to be started, calculating a second frequency reduction amplitude at intervals of a second preset time based on the difference value between the high-pressure and a preset target high pressure and the high-pressure correction coefficient, and controlling the compressor to reduce the frequency by the second frequency reduction amplitude.
4. The output control method of an air conditioner compressor as set forth in claim 3, wherein said low pressure correction coefficient is in a negative correlation with said low pressure and said high pressure correction coefficient is in a negative correlation with said high pressure.
5. The output control method of an air conditioner compressor as claimed in any one of claims 1, 2 and 4, wherein after reducing the frequency of the compressor when the pressure ratio is greater than a first preset ratio, further comprising:
when the pressure ratio is smaller than or equal to a second preset ratio, the air conditioner operates in a heating mode, and the low-pressure is smaller than or equal to a first preset low pressure, the low-pressure correction control is judged to be started;
and when the pressure ratio is smaller than or equal to a second preset ratio, the air conditioner operates in a refrigeration mode, and the high-pressure is larger than a first preset high pressure, judging to enter high-pressure correction control.
6. The output control method of an air conditioner compressor according to claim 5, wherein if it is determined to enter the corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, after reducing the frequency of the compressor, further comprising:
when the air conditioner is in the low pressure correction control, if the low pressure is greater than a second preset low pressure, the low pressure correction control is quitted, and the frequency of the compressor is controlled based on a target high pressure, wherein the second preset low pressure is greater than or equal to the first preset low pressure;
and when the air conditioner is in the high-pressure correction control, if the high-pressure is less than or equal to a second preset high pressure, the high-pressure correction control is quitted, and the frequency of the compressor is controlled based on a target low-pressure, wherein the second preset high pressure is less than or equal to the first preset high pressure.
7. The output control method of an air conditioner compressor as claimed in any one of claims 1, 2, 4, 6, wherein said decreasing the frequency of the compressor when the pressure ratio is greater than a first preset ratio comprises:
and when the pressure ratio is greater than the first preset ratio, controlling the compressor to reduce the frequency at a preset amplitude on the basis of the current compressor frequency at intervals of a third preset time.
8. The output control method of an air conditioner compressor as claimed in any one of claims 1, 2, 4, 6, further comprising, after determining a pressure ratio according to the high pressure and the low pressure:
and when the pressure ratio is smaller than or equal to the first preset ratio, executing the step of reducing the frequency of the compressor if the air conditioner is judged to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure.
9. An output control device of an air conditioner compressor, comprising:
an acquisition unit for acquiring a high pressure and a low pressure of the air conditioner;
a processing unit for determining a pressure ratio from the high pressure and the low pressure;
a control unit for reducing the frequency of the compressor when the pressure ratio is greater than a first preset ratio;
the control unit is further configured to, after reducing the frequency of the compressor, when the pressure ratio is smaller than or equal to a second preset ratio, reduce the frequency of the compressor if it is determined to enter corresponding pressure correction control according to the current operation mode of the air conditioner, the high pressure and the low pressure, where the second preset ratio is smaller than or equal to the first preset ratio.
10. An air conditioner comprising a processor and a computer-readable storage medium storing a computer program which, when read and executed by the processor, implements the output control method of an air conditioner compressor according to any one of claims 1 to 8.
11. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the output control method of an air conditioner compressor according to any one of claims 1 to 8.
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Effective date of registration: 20221009 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |