CN113587338A - Compressor exhaust temperature control method and device and air conditioner - Google Patents
Compressor exhaust temperature control method and device and air conditioner Download PDFInfo
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- CN113587338A CN113587338A CN202110720605.8A CN202110720605A CN113587338A CN 113587338 A CN113587338 A CN 113587338A CN 202110720605 A CN202110720605 A CN 202110720605A CN 113587338 A CN113587338 A CN 113587338A
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- 238000004590 computer program Methods 0.000 claims description 11
- 238000004378 air conditioning Methods 0.000 abstract description 34
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- 238000004364 calculation method Methods 0.000 description 10
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- 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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a compressor exhaust temperature control method, a device and an air conditioner, and relates to the technical field of air conditioners, wherein the compressor exhaust temperature control method comprises the following steps: monitoring the discharge temperature of the compressor; when the exhaust temperature is greater than or equal to the preset early warning temperature, acquiring a temperature difference value between the exhaust temperature and the exhaust upper limit temperature, and acquiring the change speed of the exhaust temperature; the preset early warning temperature is lower than the exhaust upper limit temperature; and controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature. The invention can realize advanced control of the exhaust temperature, avoid high-temperature exhaust protection caused by hysteresis of exhaust temperature detection, improve the stability of the operation of the air conditioning unit and improve the user experience.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling the exhaust temperature of a compressor and an air conditioner.
Background
At present, in the operation process of an air conditioner, when load changes, the frequency of a compressor and the opening degree of an electronic expansion valve change along with the change, and then the exhaust temperature of the compressor changes.
The existing exhaust temperature control technology is mainly used for reducing the frequency of the compressor or limiting the frequency of the compressor through identifying the exhaust temperature, so that the compressor cannot be protected due to overhigh exhaust temperature, however, due to the fact that the detection of the temperature sensor has hysteresis, the compressor can not reduce the frequency in time and already leads to exhaust high-temperature protection, and then leads to the stop operation of the air conditioning unit, when the exhaust temperature is reduced to a certain value, the air conditioning unit can be restarted, and the user experience is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for controlling the exhaust temperature of a compressor and an air conditioner, which can realize advanced control on the exhaust temperature, avoid high-temperature exhaust protection caused by hysteresis of exhaust temperature detection, improve the running stability of an air conditioning unit and improve user experience.
According to an embodiment of the present invention, in one aspect, there is provided a compressor discharge temperature control method, including: monitoring the discharge temperature of the compressor; when the exhaust temperature is greater than or equal to a preset early warning temperature, acquiring a temperature difference value between the exhaust temperature and an exhaust upper limit temperature, and acquiring a change speed of the exhaust temperature; the preset early warning temperature is lower than the exhaust upper limit temperature; and controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature.
Through adopting above-mentioned technical scheme, can detect exhaust temperature's trend of change, through controlling the operating frequency and the electronic expansion valve opening of compressor according to exhaust temperature's trend of change, can realize the advanced control to exhaust temperature, avoid detecting because of exhaust temperature and have the hysteresis quality and lead to the protection of exhaust high temperature, promoted air conditioning unit operation's stability, promoted user experience.
Preferably, the step of controlling the operating frequency of the compressor and the opening degree of the electronic expansion valve based on the temperature difference and the change speed of the discharge temperature includes: determining a frequency reduction value of the compressor based on the temperature difference value and the change speed of the exhaust temperature every a first preset interval, and controlling the compressor to reduce the frequency reduction value to operate; and periodically controlling the opening degree of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature.
By adopting the technical scheme, the operation frequency of the compressor and the opening of the electronic expansion valve are periodically controlled based on the temperature difference value and the variation speed of the exhaust temperature, the rising speed of the exhaust temperature can be reduced through the compressor, then the exhaust temperature is further reduced through controlling the electronic expansion valve, the high-temperature protection of exhaust is avoided, and the stability of the operation of the air conditioning unit is improved.
Preferably, the temperature difference is inversely proportional to the frequency decrease value, and the speed of change of the exhaust temperature is proportional to the frequency decrease value.
Through adopting above-mentioned technical scheme, the frequency reduction value of increase compressor when the temperature difference is less can reduce exhaust temperature fast, avoids the protection of exhaust high temperature, and through the frequency reduction value of increase compressor when exhaust temperature's rate of change is great, can reduce exhaust temperature's rising speed, avoids exhaust temperature rising speed too fast to lead to the protection of exhaust high temperature.
Preferably, the frequency reduction is calculated by the following equation: Δ F ═ a (20- Δ Td) + b ═ Vt; where Δ F is the frequency decrease amount, a and b are both constants, Δ Td is the temperature difference, and Vt is the change speed of the exhaust temperature.
By adopting the technical scheme, the frequency reduction of the compressor is calculated based on the calculation formula, the running frequency of the compressor can be accurately controlled, and the repeated fluctuation of the parameters of the air conditioning unit is avoided while the high-temperature protection of exhaust is avoided.
Preferably, the step of periodically controlling the opening degree of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature includes: determining the opening increment of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature every second preset time interval, and controlling the electronic expansion valve to increase the opening increment for operation; wherein the opening degree increase is inversely proportional to the temperature difference, and the opening degree increase is proportional to a speed of change of the exhaust gas temperature.
By adopting the technical scheme, the opening degree of the electronic expansion valve is controlled according to the temperature difference and the change temperature of the exhaust temperature, the valve opening degree of the electronic expansion valve can be increased when the exhaust temperature is close to the exhaust upper limit temperature or the change speed of the exhaust temperature is high, the pressure of an air conditioning unit is reduced, the rising speed of the exhaust temperature is reduced, and the high-temperature protection of exhaust is avoided.
Preferably, the calculation formula of the opening degree increment is as follows: Δ P ═ c (20- Δ Td) + d ═ Vt; wherein Δ P is the opening degree increment, c and d are both constants, Δ Td is the temperature difference, and Vt is the change speed of the exhaust temperature.
By adopting the technical scheme, the opening increment of the electronic expansion valve is calculated based on the calculation formula, the opening of the electronic expansion valve can be accurately controlled, the indoor refrigeration or heating effect is ensured, meanwhile, the exhaust high-temperature protection is avoided, and the user experience is improved.
Preferably, the compressor discharge temperature control method further includes: and when the operating frequency of the compressor is reduced to the minimum frequency and/or when the exhaust temperature is less than or equal to the preset temperature in a third preset time period, stopping controlling the operating frequency of the compressor and the electronic expansion valve.
By adopting the technical scheme, when the air conditioning unit meets a certain condition, the forced control on the frequency of the compressor and the electronic expansion valve is stopped, so that the refrigerating or heating effect of the air conditioning unit is ensured, and the user experience is improved.
According to an embodiment of the present invention, there is provided a compressor discharge temperature control apparatus including: the monitoring module is used for monitoring the exhaust temperature of the compressor; the acquisition module is used for acquiring a temperature difference value between the exhaust temperature and an exhaust upper limit temperature and acquiring the change speed of the exhaust temperature when the exhaust temperature is greater than or equal to a preset early warning temperature; the preset early warning temperature is lower than the exhaust upper limit temperature; and the control module is used for controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference value and the change speed of the exhaust temperature.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner including a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and when executed, implementing the method according to any one of the first aspect.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: through the temperature difference and the exhaust temperature's the change speed that acquire exhaust temperature and exhaust upper limit temperature, can detect exhaust temperature's trend of change, through controlling the operating frequency and the electronic expansion valve aperture of compressor according to exhaust temperature's trend of change, can realize the advanced control to exhaust temperature, avoid detecting because of exhaust temperature and have the hysteresis quality and lead to exhaust high temperature protection, promoted air conditioning unit operation's stability, promoted user experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a method for controlling the discharge temperature of a compressor according to the present invention;
fig. 2 is a schematic structural diagram of a compressor discharge temperature control device according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
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 present embodiment provides a method for controlling the discharge temperature of a compressor, which can be applied to an air conditioner, and referring to the flowchart of the method for controlling the discharge temperature of a compressor shown in fig. 1, the method mainly includes the following steps S102 to S106:
step S102: the discharge temperature of the compressor is monitored.
In the process of starting and running of the air conditioner, the exhaust temperature of the compressor is detected in real time based on a temperature sensor arranged on an exhaust pipe of the compressor.
Step S104: when the exhaust temperature is larger than or equal to the preset early warning temperature, the temperature difference value between the exhaust temperature and the exhaust upper limit temperature is obtained, and the change speed of the exhaust temperature is obtained.
When the exhaust temperature is greater than or equal to the preset early warning temperature, the risk of high-temperature exhaust protection of the air conditioning unit is high, the temperature difference delta Td between the exhaust temperature Td and the exhaust upper limit temperature Td-m is calculated in real time to be (Td-m) -Td according to the exhaust temperature detected in real time, the variation of the exhaust temperature in unit time (such as per second) is calculated in real time, and the variation speed Vt of the exhaust temperature is obtained.
The preset early warning temperature is smaller than the upper limit exhaust temperature of the compressor, for example, the upper limit exhaust temperature of the compressor is 120 ℃, when the exhaust temperature of the air conditioning unit in the normal operation process is about 95 ℃, the preset early warning temperature can be 100 ℃, and certain reaction time can be reserved for exhaust temperature control by setting the preset early warning temperature to be smaller than the upper limit exhaust temperature, so that high-temperature exhaust protection is avoided.
Step S106: and controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature.
The larger the temperature difference between the exhaust temperature and the exhaust upper limit temperature is, the closer the current exhaust temperature is to the exhaust upper limit temperature, and the operation frequency of the compressor and the opening degree of the electronic expansion valve need to be controlled in time to reduce the exhaust temperature. The larger the change speed of the exhaust temperature is, the higher the rising speed of the current exhaust temperature is, which is easy to cause high-temperature exhaust protection, and the rising speed of the exhaust temperature is reduced by controlling the running frequency of the compressor and the opening of the electronic expansion valve, so that the high-temperature exhaust protection is avoided.
According to the compressor exhaust temperature control method provided by the embodiment, the change trend of the exhaust temperature can be detected by acquiring the temperature difference value between the exhaust temperature and the exhaust upper limit temperature and the change speed of the exhaust temperature, the operation frequency of the compressor and the opening of the electronic expansion valve are controlled according to the change trend of the exhaust temperature, the advanced control of the exhaust temperature can be realized, the exhaust high-temperature protection caused by the hysteresis of the exhaust temperature detection is avoided, the stability of the operation of the air conditioning unit is improved, and the user experience is improved.
In order to stably operate the air conditioning unit, the present embodiment provides an implementation manner of controlling the operating frequency of the compressor and the opening degree of the electronic expansion valve based on the temperature difference and the variation speed of the exhaust temperature, and the implementation manner may be specifically executed by referring to the following steps (1) to (2):
step (1): and determining a frequency reduction value of the compressor based on the temperature difference value and the change speed of the exhaust temperature every a first preset time interval, and controlling the compressor to operate by reducing the frequency reduction value.
The first preset time is as short as possible, exhaust high-temperature protection caused by too high exhaust temperature rising speed of the compressor is avoided, the value range of the first preset time can be 10-15s, and the preferred value is 10 s.
And calculating the frequency reduction value of the compressor once every a first preset time interval, acquiring the current operating frequency of the compressor, calculating the difference value between the current operating frequency and the frequency reduction value to obtain a target frequency, and controlling the compressor to operate at the target frequency.
In one embodiment, the temperature difference is inversely proportional to the frequency reduction value and the rate of change of the exhaust temperature is directly proportional to the frequency reduction value. That is, the smaller the temperature difference between the discharge temperature and the discharge upper limit temperature, the greater the adjustment range of the operating frequency of the compressor is, indicating that the discharge temperature is closer to the discharge upper limit temperature, and the greater the temperature difference, the greater the adjustment range of the operating frequency of the compressor is, indicating that the discharge temperature is farther from the discharge upper limit temperature. The greater the speed of change of the discharge temperature, the greater the tendency of the discharge temperature to rise is indicated, the greater the amplitude of the regulation of the operating frequency of the compressor.
Through the frequency reduction value that increases the compressor when the temperature difference is less, can reduce exhaust temperature fast, avoid the protection of exhaust high temperature, through the frequency reduction value that increases the compressor when exhaust temperature's rate of change is great, can reduce exhaust temperature's rising speed, avoid exhaust temperature rising speed too fast to lead to the protection of exhaust high temperature.
In another embodiment, the frequency reduction is calculated by the following equation: Δ F ═ a (20- Δ Td) + b ═ Vt.
Where Δ F is a frequency reduction amount (Δ F is an integer), a and b are constant, Δ Td is a temperature difference, and Vt is a change speed of the exhaust temperature. The value range of the a can be 1-3, the preferred value is 1, and the preferred value is designed for reasons: when the exhaust temperature is ensured to be too high, the frequency reduction quantity of the compressor can effectively reduce the high-pressure, and the indoor effect cannot be greatly influenced. The value range of the b can be 5-10, the preferred value is 5, and the preferred value is designed for reasons: the frequency reduction quantity of the compressor is ensured to be associated with the variation trend of the exhaust temperature, and the repeated fluctuation of parameters caused by overlarge or undersize variation is avoided.
The frequency reduction amount of the compressor is calculated based on the calculation formula, so that the running frequency of the compressor can be accurately controlled, and the repeated fluctuation of the parameters of the air conditioning unit is avoided while the high-temperature exhaust protection is avoided.
Step (2): the opening degree of the electronic expansion valve is periodically controlled based on the temperature difference and the variation speed of the exhaust temperature.
Through the operating frequency and the electronic expansion valve opening degree of periodic control compressor based on the temperature difference and the variation speed of exhaust temperature, the operating frequency and the electronic expansion valve opening degree of compressor can be associated with the variation trend of exhaust temperature, accurate control to exhaust temperature is realized, exhaust temperature is prevented from generating great fluctuation, and the stability of air conditioning unit operation is improved.
In one embodiment, the opening increment of the electronic expansion valve is determined at intervals of a second preset time length based on the temperature difference value and the change speed of the exhaust temperature, and the electronic expansion valve is controlled to increase the opening increment to operate; wherein the opening degree increment is inversely proportional to the temperature difference value, and the opening degree increment is directly proportional to the change speed of the exhaust temperature.
The value range of the second preset duration can be 30-60s, and the preferred value is 30 s. And calculating the opening increment of the electronic expansion valve once every second preset time interval based on the currently acquired temperature difference and the change speed of the exhaust temperature, acquiring the current opening of the electronic expansion valve, calculating the sum of the current opening and the opening increment to obtain a target opening, and controlling the electronic expansion valve to operate at the target opening.
The smaller the temperature difference between the exhaust gas temperature and the exhaust gas upper limit temperature, the closer the exhaust gas temperature is to the exhaust gas upper limit temperature, the larger the adjustment range of the electronic expansion valve is for rapidly reducing the exhaust gas temperature, and the larger the temperature difference is, the farther the exhaust gas temperature is from the exhaust gas upper limit temperature, the smaller the adjustment range of the electronic expansion valve is. When the change speed of the exhaust temperature is larger, it is indicated that the rising tendency of the exhaust temperature is larger, and the adjustment amplitude of the electronic expansion valve is larger.
By controlling the opening degree of the electronic expansion valve according to the temperature difference and the change temperature of the exhaust temperature, the valve opening degree of the electronic expansion valve can be increased when the exhaust temperature is close to the exhaust upper limit temperature or the change speed of the exhaust temperature is high, the pressure of an air conditioning unit is reduced, the rising speed of the exhaust temperature is reduced, and the exhaust high-temperature protection is avoided.
In another embodiment, the calculation formula of the opening degree increment is: Δ P ═ c (20- Δ Td) + d ═ Vt.
Where Δ P is the opening increment, c and d are both constants, Δ Td is the temperature difference, and Vt is the variation speed of the exhaust temperature. The value range of the constant c can be 1-2, the preferred value is 1, and the preferred value is designed for reasons: at the moment, the action of the indoor valve participates in adjusting the exhaust temperature, in order to ensure the indoor effect and avoid liquid return, the opening degree of the electronic expansion valve corresponding to the indoor valve is not required to be overlarge, and the opening degree increment delta P of the electronic expansion valve corresponding to the indoor valve is required to be controlled within a certain range every time. The value range of the constant d can be 2-5, the preferred value is 3, and the preferred value is designed for the reason: the opening variation of the electronic expansion valve corresponding to the indoor unit is ensured to be associated with the variation trend of the exhaust temperature, the exhaust temperature is accurately controlled, and the repeated fluctuation of parameters caused by too large or too small variation is avoided.
By calculating the opening increment of the electronic expansion valve based on the calculation formula, the opening of the electronic expansion valve can be accurately controlled, the indoor refrigeration or heating effect is guaranteed, meanwhile, the exhaust high-temperature protection is avoided, and the user experience is improved.
In order to ensure the stable operation of the air conditioning unit, the method for controlling the discharge temperature of the compressor provided by this embodiment further includes: and when the operating frequency of the compressor is reduced to the minimum frequency and/or when the exhaust temperature is less than or equal to the preset temperature in a third preset time period, stopping controlling the operating frequency of the compressor and the electronic expansion valve.
When the air conditioning unit is in the refrigeration mode operation process, after the operation frequency of the compressor is reduced to the minimum frequency and the compressor is operated for 1 minute, the operation frequency of the compressor and the electronic expansion valve are stopped to be controlled, namely, the execution of the control method of the exhaust temperature of the compressor is quitted, so that the air conditioning unit recovers the automatic control of the exhaust temperature.
Or when the exhaust temperature of the compressor is higher than the preset temperature in a plurality of continuous periods, in order to ensure the indoor cooling or heating effect, the control on the running frequency of the compressor and the electronic expansion valve is stopped, namely the execution of the control method for the exhaust temperature of the compressor is quitted, so that the air conditioning unit resumes the automatic control of the exhaust temperature. The preset temperature may be determined according to an upper exhaust temperature limit of the air conditioning unit, such as 105 ℃ when the upper exhaust temperature limit is 120 ℃.
When the air conditioning unit meets a certain condition, the forced control on the frequency of the compressor and the electronic expansion valve is stopped, so that the refrigerating or heating effect of the air conditioning unit is ensured, and the user experience is improved.
According to the compressor exhaust temperature control method provided by the embodiment, the compressor operation frequency and the opening degree of the electronic expansion valve are adjusted according to the change trend of the exhaust temperature by detecting the change trend of the exhaust temperature, so that the excessive protection of the exhaust temperature of the compressor can be effectively avoided, and the operation reliability of the air conditioning unit is improved.
Corresponding to the method for controlling the discharge temperature of the compressor provided by the above embodiment, the embodiment of the present invention provides an example of performing the discharge prevention protection control on the air conditioner by applying the method for controlling the discharge temperature of the compressor, which can be specifically executed by referring to the following steps 1 to 5:
step 1: during the air-conditioning operation, the actual discharge temperature Td of the compressor is detected.
Step 2: when the exhaust temperature Td is larger than or equal to the preset early warning temperature Td-s, calculating the difference between the actual exhaust temperature Td and the exhaust upper limit temperature Td-m in real time (every second), wherein delta Td is (Td-m) -Td, and calculating the variation Vt of the actual exhaust temperature Td in unit time (every second).
According to the reliability of the air conditioner compressor and considering the indoor effect, an exhaust upper limit temperature Td-m is set, namely the maximum exhaust temperature of the compressor required by the system is usually 120 ℃, a preset early warning temperature value Td-s is set, namely the exhaust temperature of the compressor is higher than that in normal operation and is usually 100 ℃, and a margin is reserved.
And step 3: a frequency reduction value (may also be referred to as a frequency reduction amount) af of the compressor is periodically calculated, and the operation frequency reduction of the compressor is controlled based on the frequency reduction value af.
Frequency reduction Δ F is a function of Δ Td, Vt: Δ F ═ F ([ delta ] Td, Vt), [ delta ] F ═ a [ ([ 20- ] Δ Td) + [ b ] Vt.
When the Td is larger, the larger the distance between the exhaust temperature and the upper limit value of the exhaust temperature is, the smaller the adjustment amplitude of the compressor frequency can be, and when the Vt is larger, the larger the exhaust temperature rising trend is, and the larger the adjustment amplitude of the compressor frequency is.
The calculation period of the delta F can be 10-15s (averaging in the period), preferably 10, and the time is as short as possible, so that the protection caused by the excessively high rising speed of the exhaust temperature of the compressor is avoided; Δ F is an integer number.
a is preferably 1, the range is (1-3), and the design reason of the preferred value is as follows: the exhaust temperature is not overhigh, the high-pressure can be effectively reduced by reducing the frequency of the compressor, and the indoor effect cannot be greatly influenced.
b is preferably 5, the range is (5-10), and the design reason of the preferred value is as follows: the frequency variation of the press is ensured to be associated with the variation trend of the exhaust temperature, and the repeated fluctuation of parameters caused by overlarge or undersize variation of the exhaust temperature is avoided.
And 4, step 4: periodically calculating the opening increment delta P of the electronic expansion valve, and controlling the opening of the electronic expansion valve based on the opening increment delta P.
When the air conditioning unit operates in a refrigeration mode, the opening increment delta Pn of the electronic expansion valve is periodically calculated, the calculation period of the delta Pn can be 30-60s (average value in the period), preferably 30s, the frequency of the compressor is reduced to reduce or slow down the rise of the exhaust temperature, then the exhaust temperature is further reduced through the increase of the opening of the internal machine valve, and the delta Pn is an integer number.
When the air conditioning unit is operated in the heating mode, the opening increment Δ Pw of the electronic expansion valve is periodically calculated, where Δ Pw is c × (20- Δ Td) + d × Vt, and the calculation period of Δ Pw is preferably 30, and Δ Pw is an integer number when the air conditioning unit is operated in the heating mode, in the same manner as the Δ Pn control.
c preferably takes a value of 1, a range (1-2), and preferably takes a value of design reason: at this time, the electronic expansion valve operates to adjust the exhaust temperature, and the electronic expansion valve should not be opened too much to ensure the indoor effect and avoid liquid return, so the change amount Δ Pn of the opening degree of the electronic expansion valve per time is controlled to be within a certain range (preferably 15 pls).
d is preferably 3, the range is (2-5), and the design reason of the preferred value is as follows: the opening increment of the electronic expansion valve is ensured to be associated with the exhaust temperature variation trend, accurate control is carried out, and repeated fluctuation of parameters caused by overlarge or undersize variation is avoided.
And 5: and controlling the air conditioning unit to exit the exhaust prevention protection control.
When the air conditioning unit refrigerates, after the frequency of a compressor is reduced to the lowest frequency for 1 minute, the exhaust prevention protection control is quitted, and the step is stopped;
and secondly, the compressor continuously performs 60 cycles (10 minutes) when the exhaust temperature is not higher than 105 ℃, and the exhaust protection control is quitted (in order to ensure the indoor effect, when the exhaust temperature of the compressor can be stably not higher than 105 ℃, the compressor is allowed to operate at the current frequency).
Corresponding to the method for controlling the discharge temperature of the compressor provided by the above embodiment, the embodiment of the invention provides a discharge temperature control device of the compressor, which can be applied to an air conditioner, referring to the structural schematic diagram of the discharge temperature control device of the compressor shown in fig. 2, and the device comprises the following modules:
and a monitoring module 21 for monitoring the discharge temperature of the compressor.
The obtaining module 22 is configured to obtain a temperature difference between the exhaust temperature and the exhaust upper limit temperature and obtain a variation speed of the exhaust temperature when the exhaust temperature is greater than or equal to a preset early warning temperature; and the preset early warning temperature is less than the upper limit exhaust temperature.
And the control module 23 is configured to control the operating frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference and the variation speed of the exhaust temperature.
The above-mentioned compressor exhaust temperature controlling means that this embodiment provided, through the change speed who acquires exhaust temperature and exhaust upper limit temperature's temperature difference and exhaust temperature, can detect exhaust temperature's trend of change, through controlling the operating frequency and the electronic expansion valve aperture of compressor according to exhaust temperature's trend of change, can realize the advanced control to exhaust temperature, avoid detecting because of exhaust temperature and have the hysteresis quality and lead to exhaust high temperature protection, the stability of air conditioning unit operation has been promoted, user experience has been promoted.
In an embodiment, the control module 23 is further configured to determine a frequency reduction value of the compressor based on the temperature difference and a variation speed of the discharge temperature every a first preset time interval, and control the compressor to operate by reducing the frequency reduction value; the opening degree of the electronic expansion valve is periodically controlled based on the temperature difference and the variation speed of the exhaust temperature.
In one embodiment, the temperature difference is inversely proportional to the frequency reduction value and the rate of change of the exhaust temperature is directly proportional to the frequency reduction value.
In one embodiment, the frequency reduction is calculated by the following equation: Δ F ═ a (20- Δ Td) + b ═ Vt; where Δ F is the frequency reduction, a and b are both constants, Δ Td is the temperature difference, and Vt is the speed of change of the exhaust temperature.
In an embodiment, the control module 23 is further configured to determine an opening increment of the electronic expansion valve every second preset time period based on the temperature difference and a change speed of the exhaust temperature, and control the electronic expansion valve to increase the opening increment; wherein the opening degree increment is inversely proportional to the temperature difference value, and the opening degree increment is directly proportional to the change speed of the exhaust temperature.
In one embodiment, the calculation formula of the opening degree increment is: Δ P ═ c (20- Δ Td) + d ═ Vt; where Δ P is the opening increment, c and d are both constants, Δ Td is the temperature difference, and Vt is the variation speed of the exhaust temperature.
In one embodiment, the above apparatus further comprises:
and the exit module is used for stopping controlling the operating frequency of the compressor and the electronic expansion valve when the operating frequency of the compressor is reduced to the minimum frequency and/or when the exhaust temperature is less than or equal to the preset temperature in a third preset time period.
The above-mentioned compressor exhaust temperature control device that this embodiment provided is through the trend of change that detects exhaust temperature to adjust compressor operating frequency and electronic expansion valve's aperture according to exhaust temperature's trend of change, can effectively avoid the too high protection of compressor exhaust temperature, promoted air conditioning unit operation's reliability.
Corresponding to the method for controlling the discharge air temperature of the compressor provided by the above embodiment, the present embodiment provides an air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein when the computer program is read and executed by the processor, the method for controlling the discharge air temperature of the compressor provided by the above embodiment is implemented.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the above-mentioned method for controlling the exhaust temperature of a compressor, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. 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 compressor discharge air temperature control device and the air conditioner disclosed by the embodiment correspond to the compressor discharge air temperature control method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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)
1. A method of controlling compressor discharge temperature, comprising:
monitoring the discharge temperature of the compressor;
when the exhaust temperature is greater than or equal to a preset early warning temperature, acquiring a temperature difference value between the exhaust temperature and an exhaust upper limit temperature, and acquiring a change speed of the exhaust temperature; the preset early warning temperature is lower than the exhaust upper limit temperature;
and controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature.
2. The compressor discharge temperature control method as claimed in claim 1, wherein the step of controlling the operation frequency of the compressor and the opening degree of the electronic expansion valve based on the temperature difference value and the change speed of the discharge temperature comprises:
determining a frequency reduction value of the compressor based on the temperature difference value and the change speed of the exhaust temperature every a first preset interval, and controlling the compressor to reduce the frequency reduction value to operate;
and periodically controlling the opening degree of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature.
3. The compressor discharge temperature control method as claimed in claim 2, wherein the temperature difference value is inversely proportional to the frequency decrease value, and the discharge temperature change speed is proportional to the frequency decrease value.
4. The compressor discharge temperature control method as claimed in claim 2, wherein the frequency decrease amount is calculated by the equation: Δ F ═ a (20- Δ Td) + b ═ Vt;
where Δ F is the frequency decrease amount, a and b are both constants, Δ Td is the temperature difference, and Vt is the change speed of the exhaust temperature.
5. The compressor discharge temperature control method as claimed in claim 2, wherein the step of periodically controlling the opening degree of the electronic expansion valve based on the temperature difference and the variation speed of the discharge temperature comprises:
determining the opening increment of the electronic expansion valve based on the temperature difference and the change speed of the exhaust temperature every second preset time interval, and controlling the electronic expansion valve to increase the opening increment for operation; wherein the opening degree increase is inversely proportional to the temperature difference, and the opening degree increase is proportional to a speed of change of the exhaust gas temperature.
6. The compressor discharge temperature control method as claimed in claim 5, wherein the opening degree increment is calculated by the equation: Δ P ═ c (20- Δ Td) + d ═ Vt;
wherein Δ P is the opening degree increment, c and d are both constants, Δ Td is the temperature difference, and Vt is the change speed of the exhaust temperature.
7. The compressor discharge air temperature control method as claimed in any one of claims 1 to 6, further comprising:
and when the operating frequency of the compressor is reduced to the minimum frequency and/or when the exhaust temperature is less than or equal to the preset temperature in a third preset time period, stopping controlling the operating frequency of the compressor and the electronic expansion valve.
8. A compressor discharge temperature control apparatus, comprising:
the monitoring module is used for monitoring the exhaust temperature of the compressor;
the acquisition module is used for acquiring a temperature difference value between the exhaust temperature and an exhaust upper limit temperature and acquiring the change speed of the exhaust temperature when the exhaust temperature is greater than or equal to a preset early warning temperature; the preset early warning temperature is lower than the exhaust upper limit temperature;
and the control module is used for controlling the running frequency of the compressor and the opening of the electronic expansion valve based on the temperature difference value and the change speed of the exhaust temperature.
9. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
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Effective date of registration: 20221017 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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