CN116691278A - Control method and control system of air conditioner compressor and vehicle - Google Patents
Control method and control system of air conditioner compressor and vehicle Download PDFInfo
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- CN116691278A CN116691278A CN202310879262.9A CN202310879262A CN116691278A CN 116691278 A CN116691278 A CN 116691278A CN 202310879262 A CN202310879262 A CN 202310879262A CN 116691278 A CN116691278 A CN 116691278A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004378 air conditioning Methods 0.000 claims abstract description 62
- 238000011217 control strategy Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 13
- 230000015654 memory Effects 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 8
- 230000001276 controlling effect Effects 0.000 description 27
- 238000012360 testing method Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3213—Control means therefor for increasing the efficiency in a vehicle heat pump
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a control method and a control system of an air conditioner compressor and a vehicle, and relates to the technical field of vehicle air conditioning systems. According to the invention, the actual pressure value is compared with a plurality of preset pressure values according to the working mode of the air conditioning system, so as to determine which one of the preset pressure values the actual pressure value reaches, and then the rotating speed of the compressor of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value. According to the technical scheme, the rotating speed of the compressor can be regulated in real time according to the actual pressure value of the air conditioning system, so that the pressure of the air conditioning system is regulated, the condition that the pressure of the air conditioning system frequently reaches the protection threshold of the compressor is avoided, the starting and stopping frequency of the compressor can be reduced, meanwhile, the stability of the temperature of an air outlet of the air conditioner can be better ensured, and the comfort of a passenger cabin in summer or winter is improved.
Description
Technical Field
The present invention relates to the field of vehicle air conditioning systems, and in particular, to a control method and a control system for an air conditioning compressor, and a vehicle.
Background
With the rapid development of new energy passenger car markets, the permeability of the electric automobile is also improved. The proportion of the electric automobile carrying the heat pump air conditioner is higher and higher, and how to control the electric compressor to realize the refrigeration and the heating of the passenger cabin not only optimizes the control strategy of the compressor and reduces the probability of frequent start and stop of the compressor, but also improves the comfort of the passenger cabin in summer and winter. In the currently mainstream compressor control method for mounting a heat pump air conditioner, many protection and limitation measures are made for protecting an important energy component system of a compressor. Such as in response to ambient temperature, air conditioning gear, high and low pressure, etc.
In the prior art, main input parameters include ambient temperature, air conditioner gear, high and low pressure of an air conditioner pipeline and the like. If the air quantity gear arranged on the air conditioner panel is increased or the driver opens the window and the like to increase the thermal load of the passenger cabin in the process of refrigerating the passenger cabin in summer, the pipeline pressure of the air conditioner system is also increased. The compressor needs to be shut down when the pressure rises to the load limit of the compressor to protect the important power components of the compressor. The system often determines a threshold value according to the high pressure, when the pressure exceeds the threshold value, the compressor is cut off, and when the pressure of the system is recovered and is lower than a certain threshold value interval and reaches the safe working range of the compressor, the compressor can be requested to start again.
The prior art has the problem that the control of the compressor is simple and rough, and the compressor can be effectively protected, but the starting and stopping times of the compressor can be increased, and the service life and durability of the compressor are also a big test. More importantly, the compressor is stopped frequently, so that the continuous fluctuation of the temperature of the air outlet of the vehicle evaporator is unstable, and the comfort of the passenger cabin is further affected.
Disclosure of Invention
An object of a first aspect of the present invention is to provide a control method for an air conditioner compressor, which solves the technical problem of frequent start and stop of the compressor in the prior art.
An object of a second aspect of the present invention is to provide a control system for an air conditioner compressor.
An object of a third aspect of the present invention is to provide a vehicle having a control system for an air conditioner compressor.
According to an object of a first aspect of the present invention, there is provided a control method of an air conditioner compressor, comprising the steps of:
acquiring a working mode and an actual pressure value of an air conditioning system of a vehicle, wherein the working mode comprises a refrigerating mode and a heating mode;
comparing the actual pressure value with a plurality of preset pressure values according to the working mode of the air conditioning system to determine which of the preset pressure values the actual pressure value reaches;
and controlling the rotating speed of the compressor of the air conditioning system according to a control strategy corresponding to the preset pressure value reached by the actual pressure value.
Optionally, the plurality of preset pressure values include a first pressure value set and a second pressure value set, and the actual pressure values include a first actual pressure value at a high pressure end and a second actual pressure value at a low pressure end of the air conditioning system; comparing the actual pressure value with a plurality of preset pressure values according to the working mode of the air conditioning system to determine which of the preset pressure values the actual pressure value reaches, specifically comprising the following steps:
comparing the first actual pressure value of the high-pressure end with preset pressure values in the first pressure value group when the air conditioning system is in a refrigeration mode so as to determine which one of the first pressure value group is reached by the first actual pressure value;
comparing the second actual pressure value of the low pressure end with preset pressure values in the second pressure value group when the air conditioning system is in a heating mode to determine which of the second pressure value groups the second actual pressure value reaches, wherein the preset pressure value in the second pressure value group is larger than the preset pressure value in the first pressure value group.
Optionally, the step of controlling the rotation speed of the compressor of the air conditioning system according to the control strategy corresponding to the preset pressure value reached by the actual pressure value specifically includes the following steps:
controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in a refrigeration mode and the first actual pressure value of the high-pressure end continuously rises;
and controlling the rotation speed of the compressor to rise, keep unchanged or decrease when the air conditioning system is in a heating mode and the second actual pressure value of the low pressure end continuously decreases.
Optionally, the step of controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in the cooling mode and the first actual pressure value of the high-pressure end continuously rises, specifically includes the following steps:
when the first actual pressure value of the high-pressure end is increased to a first preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be increased to the maximum allowable rotating speed of the compressor at a first speed;
when the first actual pressure value of the high-pressure end rises to a second preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be unchanged;
and when the first actual pressure value of the high-pressure end rises to a third preset pressure value in the first pressure value group, controlling the rotation speed of the compressor to drop, wherein the third preset pressure value is larger than the second preset pressure value, and the second preset pressure value is larger than the first preset pressure value.
Optionally, when the first actual pressure value of the high-pressure end rises to a third preset pressure value in the first pressure value group, the step of controlling the rotation speed of the compressor to drop specifically includes the following steps:
when the first actual pressure value of the high-pressure end rises to the third preset pressure value, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a first step length;
and when the first actual pressure value of the high-pressure end is increased to a fourth preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a second step length, wherein the fourth preset pressure value is larger than the third preset pressure value, and the second step length is larger than the first step length.
Optionally, the step of controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in a heating mode and the second actual pressure value of the low pressure end continuously falls, specifically includes the following steps:
when the second actual pressure value of the low pressure end is reduced to a fifth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be increased to the maximum allowable rotating speed of the compressor at a second speed;
when the second actual pressure value of the low pressure end is reduced to a sixth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be unchanged;
and controlling the rotation speed of the compressor to be reduced when the second actual pressure value of the low pressure end is reduced to a seventh preset pressure value in the second pressure value group, wherein the seventh preset pressure value is smaller than the sixth preset pressure value, and the sixth preset pressure value is smaller than the fifth preset pressure value.
Optionally, when the second actual pressure value at the low pressure end drops to a seventh preset pressure value in the second pressure value set, the step of controlling the rotation speed of the compressor to drop specifically includes the following steps:
when the second actual pressure value of the low pressure end is reduced to the seventh preset pressure value, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a third step;
and when the second actual pressure value of the low pressure end is reduced to an eighth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a fourth step length, wherein the eighth preset pressure value is smaller than the seventh preset pressure value, and the fourth step length is larger than the third step length.
Optionally, the required rotation speed is calculated according to the current actual air-out temperature of the passenger cabin of the vehicle and the target air-out temperature of the evaporator in each unit calculation time sequence.
According to an object of the second aspect of the present invention, there is also provided a control system of an air conditioner compressor, comprising:
the control module comprises a memory and a processor, wherein a computing program is stored in the memory, and the computing program is used for realizing the control method when being executed by the processor.
According to an object of a third aspect of the present invention, the present invention also provides a vehicle comprising the control system described above.
According to the invention, the actual pressure value is compared with a plurality of preset pressure values according to the working mode of the air conditioning system, so as to determine which one of the preset pressure values the actual pressure value reaches, and then the rotating speed of the compressor of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value. According to the technical scheme, the rotating speed of the compressor can be regulated in real time according to the actual pressure value of the air conditioning system, so that the pressure of the air conditioning system is regulated, the condition that the pressure of the air conditioning system frequently reaches the protection threshold of the compressor is avoided, the starting and stopping frequency of the compressor can be reduced, meanwhile, the stability of the temperature of an air outlet of the air conditioner can be better ensured, and the comfort of a passenger cabin in summer or winter is improved.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a schematic flowchart of a control method of an air conditioner compressor according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a control method of an air conditioner compressor according to another embodiment of the present invention;
fig. 3 is a schematic connection block diagram of a control system of an air conditioner compressor according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Fig. 1 is a schematic flowchart of a control method of an air conditioner compressor according to an embodiment of the present invention.
As shown in fig. 1, in a specific embodiment, the control method of the air conditioner compressor includes the steps of:
step S100, acquiring an operating mode and an actual pressure value of an air conditioning system of a vehicle, wherein the operating mode comprises a refrigerating mode and a heating mode;
step S200, comparing the actual pressure value with a plurality of preset pressure values according to the working mode of the air conditioning system to determine which one of the preset pressure values is reached by the actual pressure value;
step S300, controlling the rotating speed of a compressor of the air conditioning system according to a control strategy corresponding to a preset pressure value reached by the actual pressure value. It will be appreciated that there is a control strategy for the rotational speed of the compressor to adjust the rotational speed of the compressor when the actual pressure value reaches each of the preset pressure values.
According to the embodiment, the rotating speed of the compressor can be regulated in real time according to the actual pressure value of the air conditioning system, so that the pressure of the air conditioning system is regulated, the condition that the pressure of the air conditioning system frequently reaches the protection threshold of the compressor is avoided, the starting and stopping frequency of the compressor can be reduced, meanwhile, the stability of the temperature of an air outlet of the air conditioner can be better ensured, and the comfort of a passenger cabin in summer or winter is improved.
Fig. 2 is a schematic flowchart of a control method of an air conditioner compressor according to another embodiment of the present invention. As shown in fig. 2, in this embodiment, the plurality of preset pressure values includes a first pressure value group and a second pressure value group, and the actual pressure values include a first actual pressure value at a high pressure end and a second actual pressure value at a low pressure end of the air conditioning system. It will be appreciated that this embodiment divides the plurality of preset pressure values into two pressure value sets, namely, a first pressure value set and a second pressure value set, and obtains actual pressure values of the high pressure side and the low pressure side of the air conditioning system, namely, a first actual pressure value and a second actual pressure value. And comparing the first actual pressure value of the high-pressure end with a preset pressure value in a first pressure value group or comparing the second actual pressure value of the low-pressure end with a preset pressure value in a second pressure value group according to the working mode of the air conditioning system. The step S200 specifically includes the following steps:
step S210, comparing the first actual pressure value of the high-pressure end with preset pressure values in the first pressure value group when the air conditioning system is in the refrigeration mode so as to determine which one of the first pressure value group is reached by the first actual pressure value;
step S220, comparing the second actual pressure value of the low pressure end with the preset pressure values in the second pressure value set when the air conditioning system is in the heating mode, so as to determine which of the second pressure value sets the second actual pressure value reaches, wherein the preset pressure value in the second pressure value set is greater than the preset pressure value in the first pressure value set.
In this embodiment, the step S300 specifically includes the steps of:
step one: controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in a refrigeration mode and the first actual pressure value of the high-pressure end continuously rises;
step two: the speed of the compressor is controlled to rise, remain unchanged or fall when the air conditioning system is in heating mode and the second actual pressure value at the low pressure end continuously falls.
In this embodiment, the first step specifically includes the following steps:
step S310, when the first actual pressure value of the high-pressure end rises to a first preset pressure value in the first pressure value group, controlling the rotation speed of the compressor to rise to the maximum allowable rotation speed of the compressor at a first speed, wherein the first speed needs to be set by combining a real vehicle, an annular die cabin and a road test;
step S320, when the first actual pressure value of the high-pressure end rises to a second preset pressure value in the first pressure value group, controlling the rotation speed of the compressor to be unchanged;
in step S330, when the first actual pressure value at the high pressure end increases to a third preset pressure value in the first pressure value set, the rotation speed of the compressor is controlled to decrease, wherein the third preset pressure value is greater than the second preset pressure value, and the second preset pressure value is greater than the first preset pressure value.
In this embodiment, step S330 specifically includes the steps of:
step S331, when a first actual pressure value of a high-pressure end rises to a third preset pressure value, controlling the rotating speed of a compressor to be reduced to a current required rotating speed in a first step;
in step S332, when the first actual pressure value at the high pressure end increases to a fourth preset pressure value in the first pressure value set, the rotation speed of the compressor is controlled to decrease to the current required rotation speed in a second step size, wherein the fourth preset pressure value is greater than the third preset pressure value, and the second step size is greater than the first step size.
In this embodiment, the first preset pressure value is any value ranging from 18Pa to 22Pa, and may be, for example, 18Pa, 19Pa, 20Pa, 21Pa, or 22Pa. The second preset pressure value is any value ranging from 23Pa to 25Pa, for example, may be 23Pa, 24Pa, or 25Pa. The third preset pressure value is any value ranging from 26Pa to 27Pa, and may be, for example, 26Pa or 27Pa. The fourth preset pressure value is any value ranging from 28Pa to 30Pa, for example, 28Pa, 29Pa, or 30Pa. In a preferred embodiment, the first preset pressure value is 20Pa, the second preset pressure value is 25Pa, the third preset pressure value is 27Pa, and the fourth preset pressure value is 28Pa. In this embodiment, the first step refers to a speed of 0.01s down by 100r to reduce the rotational speed, and the second step refers to a speed of 0.01s down by 150r to reduce the rotational speed.
In this embodiment, step two includes the steps of:
step S340, when the second actual pressure value at the low pressure end is reduced to a fifth preset pressure value in the second pressure value set, controlling the rotation speed of the compressor to rise to the maximum allowable rotation speed of the compressor at a second speed, wherein the second speed needs to be set in combination with the real vehicle, the annular mold cabin and the road test, and the second speed is different from the first speed under the general condition;
step S350, when the second actual pressure value of the low pressure end is reduced to a sixth preset pressure value in the second pressure value group, controlling the rotation speed of the compressor to be unchanged;
and step S360, controlling the rotation speed of the compressor to be reduced when the second actual pressure value at the low pressure end is reduced to a seventh preset pressure value in the second pressure value group, wherein the seventh preset pressure value is smaller than a sixth preset pressure value, and the sixth preset pressure value is smaller than the fifth preset pressure value. Here, step S340 and step S310 have no precedence relationship.
In this embodiment, step S360 specifically includes the steps of:
step S361, when the second actual pressure value of the low pressure end is reduced to a seventh preset pressure value, controlling the rotation speed of the compressor to be reduced to the current required rotation speed in a third step;
in step S362, when the second actual pressure value at the low pressure end decreases to an eighth preset pressure value in the second pressure value set, the rotation speed of the compressor is controlled to decrease to the current required rotation speed in a fourth step size, where the eighth preset pressure value is smaller than the seventh preset pressure value, and the fourth step size is larger than the third step size. Here, the required rotation speed is calculated from the current actual outlet air temperature of the passenger compartment of the vehicle and the target outlet air temperature of the evaporator in each unit calculation timing. It will be appreciated that the required rotational speed is varied in real time.
In this embodiment, the fifth preset pressure value is any value ranging between 1.5Pa and 1.35Pa, and may be, for example, 1.5Pa, 1.4Pa, or 1.35Pa. The sixth preset pressure value is any value ranging from 1.34Pa to 1.15Pa, and may be, for example, 1.34Pa, 1.3Pa, 1.2Pa, or 1.15Pa. The seventh preset pressure value is any value ranging from 1.14Pa to 1.06Pa, and may be, for example, 1.14Pa, 1.1Pa, or 1.06Pa. The fourth preset pressure value is any value ranging from 1.06Pa to 1Pa, for example, may be 1.06Pa, 1.05Pa, or 1Pa. In a preferred embodiment, the fifth preset pressure value is 1.4Pa, the sixth preset pressure value is 1.2Pa, the seventh preset pressure value is 1.1Pa, and the eighth preset pressure value is 1.05Pa. In this embodiment, the first step refers to a speed of 0.01s down by 100r to reduce the rotational speed, and the second step refers to a speed of 0.01s down by 200r to reduce the rotational speed.
In this embodiment, when the passenger compartment is in the cooling state, the control system may determine that the air conditioning system is in the cooling mode, and then may learn the allowable high and low pressure range of the air conditioning system and the maximum allowable rotation speed of the compressor. When the first actual pressure value of the high-pressure end is larger than the first preset pressure value, if the load of the passenger cabin is larger or the heat dissipation capacity of the front-end heat dissipation module reaches the limit, the required rotation speed of the compressor is likely to be further increased, so that the pipeline pressure of the air conditioning system is increased accordingly, and the stability of the control of the air conditioning system is affected to a certain extent. Therefore, when the first actual pressure value of the high-pressure end reaches above the first preset pressure value, the rotation speed of the compressor is controlled to rise to the maximum allowable rotation speed of the compressor at a first speed. If the first actual pressure value continues to rise to the second preset pressure value, the required rotating speed is maintained unchanged, and the required rotating speed is output through the LIN bus. If the first actual pressure value continues to rise to the third preset pressure value, the first step is decremented in each unit calculation time sequence based on the currently calculated required rotational speed. If the third actual pressure value is not reduced and continuously rises to the fourth actual pressure value, the third actual pressure value is reduced by a second step length based on the currently calculated required rotation speed in each unit calculation time sequence. The preset pressure value and the step length are all required to be continuously tested in the environment of the heat pump air conditioner rack or the whole vehicle annular module test in advance and finally determined through verification.
When the passenger cabin is in a heat pump heating state, the control system can judge that the air conditioning system is in a heating mode, and the range of a high-low pressure interval allowed by the air conditioning system and the maximum allowable rotating speed of the compressor can be known. In order to avoid that the suction pressure of the compressor is lower than a limiting threshold value, so that the compressor is idle and is damaged due to high load, the control system makes a judgment that when the second actual pressure value of the low pressure end is lower than a fifth preset pressure value, if the air outlet temperature of the passenger cabin does not reach a control target, the demand rotation speed of the compressor is further increased to meet the comfort of the passenger cabin, the suction effect of the compressor is enhanced, the pressure of the low pressure end is continuously reduced, and the durability and the service life of the components of the compressor are ensured, and at the moment, the control system controls the demand rotation speed of the compressor to be increased to the maximum allowable rotation speed of the compressor at a second speed when the second actual pressure value is lower than the fifth preset pressure value. If the second actual pressure value continues to be reduced to a sixth preset pressure value, the control system maintains the required rotating speed unchanged and outputs the required rotating speed through the LIN bus. If the second actual pressure value continues to decrease to the seventh preset pressure value, the second actual pressure value is decreased by a third step length in each unit calculation time sequence based on the currently calculated required rotation speed. If the second actual pressure value is not increased to continuously decrease to the eighth preset pressure value, the second actual pressure value is decreased by a fourth step length in each unit calculation time sequence based on the current calculated required rotation speed. The preset pressure value and the step length are all required to be continuously tested in the environment of the heat pump air conditioner rack or the whole vehicle annular module test in advance and finally determined through verification.
According to the embodiment, different compressor control is performed according to the working modes of the refrigerant loop of the air conditioning system, and the control methods of the compressors are different in different working modes, so that the compressors can be stably and safely operated while being protected, the start and stop times of the compressors can be reduced, and the comfort of a passenger cabin is not affected.
This embodiment is directed to a compressor whose power just meets the air conditioning system pressure, so frequent start-up and shut-down are likely to occur when the air conditioning system pressure continues to rise or fall. For example, if the high pressure protection threshold of the compressor is 31Pa, the compressor may need to be controlled to stop at 30Pa, and the compressor is restarted at a pressure lower than 30Pa, so if no adjustment is made before the pressure reaches 30Pa, the compressor will frequently reach 30Pa, so frequent start-up and stop are easy. In the embodiment, the pressure of the air conditioning system is regulated by regulating the rotating speed of the compressor before the pressure reaches 30Pa, so that the frequency of the pressure reaching 30Pa is reduced, and the frequent start and stop of the compressor are avoided. If the power of the compressor is too high, the pressure of the air conditioning system is far satisfied, so that the condition that the compressor is frequently started and stopped does not occur, but the cost is high.
Fig. 3 is a schematic connection block diagram of a control system of an air conditioner compressor according to an embodiment of the present invention. As shown in fig. 3, in this embodiment, the control system 100 of the air conditioner compressor includes a control module 10, the control module 10 includes a memory 11 and a processor 12, and a computer program is stored in the memory 11, and the computer program is used to implement the control method when executed by the processor. The processor 12 may be a central processing unit (central processing unit, CPU for short), or a digital processing unit or the like. The processor 12 transmits and receives data through a communication interface. The memory 11 is used to store programs executed by the processor 12. The memory 11 is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, and may be a combination of multiple memories 11. The above-described computer program may be downloaded from a computer readable storage medium to a corresponding computing/processing device or downloaded to a computer or an external memory device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network). Here, the control module 10 may be a vehicle body controller.
For the purposes of this description of the embodiments, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in the computer memory 11.
This embodiment also provides a vehicle including the control system 100 described above. For the control system 100, a detailed description is omitted here.
In this embodiment, the required rotation speed can be controlled according to the protection requirement of the compressor for different refrigerant operation modes, namely, when the passenger cabin is refrigerating or heating. Meanwhile, the preset pressure values in different working modes can be set separately according to scenes and working conditions to avoid rough control strategies of one cut, so that the temperature stability of an air outlet of an air conditioner can be better controlled while the occurrence frequency of starting and stopping of a compressor is reduced, and the comfort of a passenger cabin in summer or winter is improved.
Compared with the prior art, the embodiment has the most important that the control strategy does not conflict with the comfort control of the protection compressor and the passenger cabin, and the protection compressor is made into a dynamic real-time adjusting process, so that NVH noise caused by frequently cutting off the compressor, the air conditioner air outlet temperature and the result that the whole system continuously oscillates and cannot be converged are avoided.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
Claims (10)
1. A control method of an air conditioner compressor, comprising the steps of:
acquiring a working mode and an actual pressure value of an air conditioning system of a vehicle, wherein the working mode comprises a refrigerating mode and a heating mode;
comparing the actual pressure value with a plurality of preset pressure values according to the working mode of the air conditioning system to determine which of the preset pressure values the actual pressure value reaches;
and controlling the rotating speed of the compressor of the air conditioning system according to a control strategy corresponding to the preset pressure value reached by the actual pressure value.
2. The control method according to claim 1, wherein the plurality of preset pressure values includes a first pressure value group and a second pressure value group, and the actual pressure values include a first actual pressure value at a high pressure end and a second actual pressure value at a low pressure end of the air conditioning system; comparing the actual pressure value with a plurality of preset pressure values according to the working mode of the air conditioning system to determine which of the preset pressure values the actual pressure value reaches, specifically comprising the following steps:
comparing the first actual pressure value of the high-pressure end with preset pressure values in the first pressure value group when the air conditioning system is in a refrigeration mode so as to determine which one of the first pressure value group is reached by the first actual pressure value;
comparing the second actual pressure value of the low pressure end with preset pressure values in the second pressure value group when the air conditioning system is in a heating mode to determine which of the second pressure value groups the second actual pressure value reaches, wherein the preset pressure value in the second pressure value group is larger than the preset pressure value in the first pressure value group.
3. The control method according to claim 2, characterized by comprising the step of controlling the rotational speed of a compressor of the air conditioning system according to a control strategy corresponding to the preset pressure value reached by the actual pressure value, specifically comprising the steps of:
controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in a refrigeration mode and the first actual pressure value of the high-pressure end continuously rises;
and controlling the rotation speed of the compressor to rise, keep unchanged or decrease when the air conditioning system is in a heating mode and the second actual pressure value of the low pressure end continuously decreases.
4. A control method according to claim 3, characterized by the step of controlling the rotation speed of the compressor to rise, remain unchanged or drop when the air conditioning system is in cooling mode and the first actual pressure value of the high pressure side is continuously rising, comprising in particular the steps of:
when the first actual pressure value of the high-pressure end is increased to a first preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be increased to the maximum allowable rotating speed of the compressor at a first speed;
when the first actual pressure value of the high-pressure end rises to a second preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be unchanged;
and when the first actual pressure value of the high-pressure end rises to a third preset pressure value in the first pressure value group, controlling the rotation speed of the compressor to drop, wherein the third preset pressure value is larger than the second preset pressure value, and the second preset pressure value is larger than the first preset pressure value.
5. The control method according to claim 4, characterized by the step of controlling the rotation speed of the compressor to decrease when the first actual pressure value of the high pressure side rises to a third preset pressure value in the first pressure value group, comprising the steps of:
when the first actual pressure value of the high-pressure end rises to the third preset pressure value, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a first step length;
and when the first actual pressure value of the high-pressure end is increased to a fourth preset pressure value in the first pressure value group, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a second step length, wherein the fourth preset pressure value is larger than the third preset pressure value, and the second step length is larger than the first step length.
6. The control method according to claim 5, characterized by the step of controlling the rotation speed of the compressor to rise, remain unchanged or fall when the air conditioning system is in heating mode and the second actual pressure value of the low pressure side continuously falls, comprising in particular the steps of:
when the second actual pressure value of the low pressure end is reduced to a fifth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be increased to the maximum allowable rotating speed of the compressor at a second speed;
when the second actual pressure value of the low pressure end is reduced to a sixth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be unchanged;
and controlling the rotation speed of the compressor to be reduced when the second actual pressure value of the low pressure end is reduced to a seventh preset pressure value in the second pressure value group, wherein the seventh preset pressure value is smaller than the sixth preset pressure value, and the sixth preset pressure value is smaller than the fifth preset pressure value.
7. The control method according to claim 6, characterized by the step of controlling the rotation speed of the compressor to decrease when the second actual pressure value of the low pressure side decreases to a seventh preset pressure value in the second pressure value group, comprising the steps of:
when the second actual pressure value of the low pressure end is reduced to the seventh preset pressure value, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a third step;
and when the second actual pressure value of the low pressure end is reduced to an eighth preset pressure value in the second pressure value group, controlling the rotating speed of the compressor to be reduced to the current required rotating speed in a fourth step length, wherein the eighth preset pressure value is smaller than the seventh preset pressure value, and the fourth step length is larger than the third step length.
8. The control method according to claim 7, wherein,
the required rotating speed is calculated according to the current actual air-out temperature of the passenger cabin of the vehicle and the target air-out temperature of the evaporator in each unit calculation time sequence.
9. A control system of an air conditioner compressor, comprising:
a control module comprising a memory and a processor, the memory having stored therein a computing program which when executed by the processor is adapted to carry out the control method according to any one of claims 1-8.
10. A vehicle comprising the control system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879262.9A CN116691278A (en) | 2023-07-17 | 2023-07-17 | Control method and control system of air conditioner compressor and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310879262.9A CN116691278A (en) | 2023-07-17 | 2023-07-17 | Control method and control system of air conditioner compressor and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN116691278A true CN116691278A (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310879262.9A Pending CN116691278A (en) | 2023-07-17 | 2023-07-17 | Control method and control system of air conditioner compressor and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116691278A (en) |
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2023
- 2023-07-17 CN CN202310879262.9A patent/CN116691278A/en active Pending
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