A method for controlling an air conditioning compressor, a control system, and a vehicle.

Abstract

This invention provides a control method, control system, and vehicle for an air conditioning compressor, relating to the field of vehicle air conditioning system technology. In this invention, the actual pressure value is compared with multiple preset pressure values ​​based on the operating mode of the air conditioning system to determine which of the preset pressure values ​​the actual pressure value reaches. Then, the compressor speed is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value. This technical solution can adjust the compressor speed in real time based on the actual pressure value of the air conditioning system, thereby regulating the pressure of the air conditioning system and preventing the system pressure from frequently reaching the compressor protection threshold. This reduces the frequency of compressor start-stop, and also better ensures the stability of the air conditioning outlet temperature, improving passenger cabin comfort in summer or winter.

Description

Technical Field

[0001] This invention relates to the field of vehicle air conditioning system technology, and in particular to a control method, control system and vehicle for an air conditioning compressor. Background Technology

[0002] With the rapid development of the new energy passenger vehicle market, the penetration rate of electric vehicles is also increasing. The proportion of electric vehicles equipped with heat pump air conditioning is also rising. How to control the electric compressor to achieve cooling and heating of the passenger cabin is crucial. Optimizing the compressor control strategy reduces the probability of frequent compressor start-stop cycles, while also improving passenger cabin comfort in summer and winter. In current mainstream compressor control methods for heat pump air conditioning systems, many protective and limiting measures are implemented to protect this important energy component system. These measures include factors such as ambient temperature, air conditioning setting, and high and low pressure.

[0003] In existing technologies, the main input parameters include ambient temperature, air conditioning setting, and high and low pressure in the air conditioning piping. During summer, if the passenger compartment is cooled, actions such as increasing the fan speed on the air conditioning panel or opening windows by the driver increase the heat load on the passenger compartment, causing the air conditioning system's piping pressure to rise. When the pressure rises to the compressor's load limit, the compressor needs to be shut off to protect this critical power component. The system typically determines a threshold based on the high pressure; when the pressure exceeds this threshold, the compressor is shut off. Once the system pressure recovers and falls below a certain threshold range, reaching the compressor's safe operating range, the compressor can be restarted.

[0004] The problem with existing technology is that the control of the compressor is simplistic and crude. While this can effectively protect the compressor, it increases the number of times the compressor starts and stops, posing a significant challenge to its lifespan and durability. More importantly, frequent compressor shutdowns cause continuous fluctuations in the evaporator outlet temperature, which in turn affects the comfort of the passenger compartment. Summary of the Invention

[0005] The first objective of this invention is to provide a control method for an air conditioning compressor, thereby solving the technical problem of frequent compressor start-stop in the prior art.

[0006] The second aspect of this invention is to provide a control system for an air conditioning compressor.

[0007] The third aspect of this invention aims to provide a vehicle having a control system for an air conditioning compressor.

[0008] According to a first aspect of the present invention, the present invention provides a method for controlling an air conditioning compressor, comprising the following steps:

[0009] The operating mode and actual pressure value of the vehicle's air conditioning system are obtained, including the cooling mode and the heating mode.

[0010] The actual pressure value is compared with multiple preset pressure values ​​according to the working mode of the air conditioning system to determine which of the multiple preset pressure values ​​the actual pressure value reaches.

[0011] The compressor speed of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value.

[0012] Optionally, the plurality of preset pressure values ​​include a first pressure value group and a second pressure value group, and the actual pressure value includes a first actual pressure value at the high-pressure end and a second actual pressure value at the low-pressure end of the air conditioning system; the step of comparing the actual pressure value with the plurality of preset pressure values ​​according to the operating mode of the air conditioning system to determine which of the plurality of preset pressure values ​​the actual pressure value reaches specifically includes the following steps:

[0013] When the air conditioning system is in cooling mode, the first actual pressure value at the high-pressure end is compared with the preset pressure value in the first pressure value group to determine which one of the first pressure value groups the first actual pressure value reaches.

[0014] When the air conditioning system is in heating mode, the second actual pressure value at the low pressure end is compared with the preset pressure value in the second pressure value group to determine which of the second pressure value groups the second actual pressure value reaches. The preset pressure value in the second pressure value group is greater than the preset pressure value in the first pressure value group.

[0015] Optionally, the step of controlling the compressor speed 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:

[0016] When the air conditioning system is in cooling mode and the first actual pressure value at the high-pressure end continues to rise, the compressor speed is controlled to increase, remain unchanged, or decrease.

[0017] When the air conditioning system is in heating mode and the second actual pressure value at the low-pressure end continues to decrease, the compressor speed is controlled to increase, remain unchanged, or decrease.

[0018] Optionally, the step of controlling the compressor speed to increase, remain constant, or decrease when the air conditioning system is in cooling mode and the first actual pressure value at the high-pressure end continues to rise specifically includes the following steps:

[0019] When the first actual pressure value at the high-pressure end rises to the first preset pressure value in the first pressure value group, the speed of the compressor is controlled to rise at a first rate to the maximum permissible speed of the compressor.

[0020] When the first actual pressure value at the high-pressure end rises to the second preset pressure value in the first pressure value group, the speed of the compressor is controlled to remain unchanged;

[0021] When the first actual pressure value at the high-pressure end rises to the third preset pressure value in the first pressure value group, the 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.

[0022] Optionally, the step of controlling the compressor speed to decrease when the first actual pressure value at the high-pressure end rises to the third preset pressure value in the first pressure value group specifically includes the following steps:

[0023] When the first actual pressure value at the high-pressure end rises to the third preset pressure value, the speed of the compressor is controlled to decrease to the current required speed in a step-by-step manner.

[0024] When the first actual pressure value at the high-pressure end rises to the fourth preset pressure value in the first pressure value group, the speed of the compressor is controlled to decrease to the current required speed in a second step, wherein the fourth preset pressure value is greater than the third preset pressure value, and the second step is greater than the first step.

[0025] Optionally, the step of controlling the compressor speed to increase, remain constant, or decrease when the air conditioning system is in heating mode and the second actual pressure value at the low-pressure end continues to decrease specifically includes the following steps:

[0026] When the second actual pressure value at the low pressure end drops to the fifth preset pressure value in the second pressure value group, the speed of the compressor is controlled to increase at a second rate to the maximum permissible speed of the compressor.

[0027] When the second actual pressure value at the low pressure end drops to the sixth preset pressure value in the second pressure value group, the speed of the compressor is controlled to remain unchanged;

[0028] When the second actual pressure value at the low-pressure end drops to the seventh preset pressure value in the second pressure value group, the speed of the compressor is controlled to decrease, wherein the seventh preset pressure value is less than the sixth preset pressure value, and the sixth preset pressure value is less than the fifth preset pressure value.

[0029] Optionally, the step of controlling the compressor speed to decrease when the second actual pressure value at the low-pressure end drops to the seventh preset pressure value in the second pressure value group specifically includes the following steps:

[0030] When the second actual pressure value at the low-pressure end drops to the seventh preset pressure value, the speed of the compressor is controlled to decrease in a third step to the current required speed.

[0031] When the second actual pressure value at the low-pressure end drops to the eighth preset pressure value in the second pressure value group, the speed of the compressor is controlled to decrease to the current required speed in a fourth step, wherein the eighth preset pressure value is less than the seventh preset pressure value, and the fourth step is greater than the third step.

[0032] Optionally, the required rotational speed is calculated based on the current actual air outlet temperature of the vehicle's passenger compartment and the target air outlet temperature of the evaporator within each unit calculation time period.

[0033] According to a second aspect of the present invention, the present invention also provides a control system for an air conditioning compressor, comprising:

[0034] The control module includes a memory and a processor. The memory stores a calculation program, which is executed by the processor to implement the control method described above.

[0035] According to a third aspect of the present invention, the present invention also provides a vehicle including the control system described above.

[0036] In this invention, the actual pressure value is compared with multiple preset pressure values ​​based on the operating mode of the air conditioning system to determine which of the preset pressure values ​​the actual pressure value reaches. Then, the compressor speed of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value. This technical solution can adjust the compressor speed in real time based on the actual pressure value of the air conditioning system, thereby regulating the pressure of the air conditioning system and preventing the system pressure from frequently reaching the compressor protection threshold. This reduces the frequency of compressor start-stop and also better ensures the stability of the air outlet temperature, improving the comfort of the passenger cabin in summer or winter.

[0037] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0038] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0039] Figure 1 This is a schematic flowchart of a control method for an air conditioning compressor according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic flowchart of a control method for an air conditioning compressor according to another embodiment of the present invention;

[0041] Figure 3 This is a schematic connection block diagram of the control system of an air conditioning compressor according to an embodiment of the present invention. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] Figure 1 This is a schematic flowchart of a control method for an air conditioning compressor according to an embodiment of the present invention.

[0044] like Figure 1 As shown, in one specific embodiment, the control method for the air conditioning compressor includes the following steps:

[0045] Step S100: Obtain the operating mode and actual pressure value of the vehicle's air conditioning system. The operating mode includes cooling mode and heating mode.

[0046] Step S200: Compare the actual pressure value with multiple preset pressure values ​​according to the working mode of the air conditioning system to determine which of the multiple preset pressure values ​​the actual pressure value reaches;

[0047] Step S300: The compressor speed of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value. This can be understood as follows: for each preset pressure value reached by the actual pressure value, there is a control strategy for the compressor speed to adjust the compressor speed.

[0048] This embodiment can adjust the compressor speed in real time according to the actual pressure value of the air conditioning system, thereby regulating the pressure of the air conditioning system and avoiding the air conditioning system pressure from frequently reaching the compressor protection threshold. This can reduce the frequency of compressor start-stop and also better ensure the stability of the air conditioning outlet temperature, improving the comfort of the passenger cabin in summer or winter.

[0049] Figure 2 This is a schematic flowchart of a control method for an air conditioning compressor according to another embodiment of the present invention. Figure 2 As shown, in this embodiment, the multiple preset pressure values ​​include a first pressure value group and a second pressure value group, and the actual pressure values ​​include the first actual pressure value at the high-pressure end and the second actual pressure value at the low-pressure end of the air conditioning system. It can be understood that this embodiment divides the multiple preset pressure values ​​into two pressure value groups, namely the first pressure value group and the second pressure value group, and obtains the actual pressure values ​​at the high-pressure end and the low-pressure end of the air conditioning system, namely the first actual pressure value and the second actual pressure value. Specifically, depending on the operating mode of the air conditioning system, the first actual pressure value at the high-pressure end is compared with the preset pressure value in the first pressure value group, or the second actual pressure value at the low-pressure end is compared with the preset pressure value in the second pressure value group. Step S200 specifically includes the following steps:

[0050] Step S210: When the air conditioning system is in cooling mode, compare the first actual pressure value at the high pressure end with the preset pressure value in the first pressure value group to determine which one of the first pressure value groups the first actual pressure value reaches.

[0051] Step S220: When the air conditioning system is in heating mode, the second actual pressure value at the low pressure end is compared with the preset pressure value in the second pressure value group to determine which one in the second pressure value group the second actual pressure value reaches. The preset pressure value in the second pressure value group is greater than the preset pressure value in the first pressure value group.

[0052] In this embodiment, step S300 specifically includes the following steps:

[0053] Step 1: When the air conditioning system is in cooling mode and the first actual pressure value at the high-pressure end continues to rise, control the compressor speed to increase, remain constant, or decrease.

[0054] Step 2: When the air conditioning system is in heating mode and the second actual pressure value at the low-pressure end continues to decrease, control the compressor speed to increase, remain unchanged, or decrease.

[0055] In this embodiment, step one specifically includes the following steps:

[0056] Step S310: When the first actual pressure value at the high pressure end rises to the first preset pressure value in the first pressure value group, control the compressor speed to rise to the compressor's maximum permissible speed at a first rate. Here, the first rate needs to be set in conjunction with actual vehicle, environmental test chamber and road test.

[0057] Step S320: When the first actual pressure value at the high pressure end rises to the second preset pressure value in the first pressure value group, the speed of the compressor is controlled to remain unchanged.

[0058] Step S330: When the first actual pressure value at the high-pressure end rises to the third preset pressure value in the first pressure value group, the 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.

[0059] In this embodiment, step S330 specifically includes the following steps:

[0060] Step S331: When the first actual pressure value at the high-pressure end rises to the third preset pressure value, control the compressor speed to decrease to the current required speed by the first step length.

[0061] Step S332: When the first actual pressure value at the high-pressure end rises to the fourth preset pressure value in the first pressure value group, the speed of the compressor is controlled to decrease to the current required speed in a second step, wherein the fourth preset pressure value is greater than the third preset pressure value, and the second step is greater than the first step.

[0062] In this embodiment, the first preset pressure value is any value between 18 Pa and 22 Pa, for example, 18 Pa, 19 Pa, 20 Pa, 21 Pa, or 22 Pa. The second preset pressure value is any value between 23 Pa and 25 Pa, for example, 23 Pa, 24 Pa, or 25 Pa. The third preset pressure value is any value between 26 Pa and 27 Pa, for example, 26 Pa or 27 Pa. The fourth preset pressure value is any value between 28 Pa and 30 Pa, for example, 28 Pa, 29 Pa, or 30 Pa. In a preferred embodiment, the first preset pressure value is 20 Pa, the second preset pressure value is 25 Pa, the third preset pressure value is 27 Pa, and the fourth preset pressure value is 28 Pa. In this embodiment, the first step refers to a decrease in rotation speed of 100 r / s every 0.01 s, and the second step refers to a decrease in rotation speed of 150 r / s every 0.01 s.

[0063] In this embodiment, step two includes the following steps:

[0064] In step S340, when the second actual pressure value at the low pressure end drops to the fifth preset pressure value in the second pressure value group, the compressor speed is controlled to rise at the second rate to the compressor's maximum permissible speed. Here, the second rate needs to be set in conjunction with actual vehicle, environmental test chamber and road test. Under normal circumstances, the second rate is different from the first rate.

[0065] Step S350: When the second actual pressure value at the low pressure end drops to the sixth preset pressure value in the second pressure value group, the speed of the compressor is controlled to remain unchanged.

[0066] In step S360, when the second actual pressure value at the low-pressure end drops to the seventh preset pressure value in the second pressure value group, the compressor speed is controlled to decrease. The seventh preset pressure value is less than the sixth preset pressure value, and the sixth preset pressure value is less than the fifth preset pressure value. It should be noted that steps S340 and S310 are not sequential.

[0067] In this embodiment, step S360 specifically includes the following steps:

[0068] Step S361: When the second actual pressure value at the low pressure end drops to the seventh preset pressure value, control the compressor speed to decrease to the current required speed in a third step.

[0069] In step S362, when the second actual pressure value at the low-pressure end drops to the eighth preset pressure value in the second pressure value group, the compressor speed is controlled to decrease by a fourth step to the current required speed. Here, the eighth preset pressure value is less than the seventh preset pressure value, and the fourth step is greater than the third step. The required speed is calculated based on the current actual air outlet temperature of the vehicle's passenger compartment and the target air outlet temperature of the evaporator within each unit calculation time sequence. This can be understood as the required speed changing in real time.

[0070] In this embodiment, the fifth preset pressure value is any value between 1.5 Pa and 1.35 Pa, for example, 1.5 Pa, 1.4 Pa, or 1.35 Pa. The sixth preset pressure value is any value between 1.34 Pa and 1.15 Pa, for example, 1.34 Pa, 1.3 Pa, 1.2 Pa, or 1.15 Pa. The seventh preset pressure value is any value between 1.14 Pa and 1.06 Pa, for example, 1.14 Pa, 1.1 Pa, or 1.06 Pa. The fourth preset pressure value is any value between 1.06 Pa and 1 Pa, for example, 1.06 Pa, 1.05 Pa, or 1 Pa. In a preferred embodiment, the fifth preset pressure value is 1.4 Pa, the sixth preset pressure value is 1.2 Pa, the seventh preset pressure value is 1.1 Pa, and the eighth preset pressure value is 1.05 Pa. In this embodiment, the first step refers to reducing the rotation speed by decreasing the speed by 100r in 0.01s, and the second step refers to reducing the rotation speed by decreasing the speed by 200r in 0.01s.

[0071] In this embodiment, when the passenger compartment is in cooling mode, the control system determines that the air conditioning system is in cooling mode. At this time, it can determine the allowable high and low pressure ranges of the air conditioning system and the maximum permissible speed of the compressor. When the first actual pressure value at the high-pressure end is greater than the first preset pressure value, if the load on the passenger compartment is still relatively large or the heat dissipation capacity of the front-end heat dissipation module has reached its limit, the required speed of the compressor is likely to increase further. This will cause the air conditioning system pipeline pressure to rise accordingly, thereby affecting the stability of the air conditioning system control. Therefore, when the first actual pressure value at the high-pressure end reaches or exceeds the first preset pressure value, the compressor speed is controlled to increase at a first rate to the compressor's maximum permissible speed. If the first actual pressure value continues to rise to the second preset pressure value, the required speed is maintained unchanged and output through the LIN bus. If the first actual pressure value continues to rise to the third preset pressure value, the required speed is decreased by the first step size within each unit calculation time sequence based on the currently calculated required speed. If the third actual pressure value still cannot be reduced and continues to rise to the fourth actual pressure value, the required speed is decreased by the second step size within each unit calculation time sequence based on the currently calculated required speed. The preset pressure values ​​and step sizes mentioned above need to be tested and verified in advance in the environment of heat pump air conditioning test bench or whole vehicle ring mold chamber test to be finally determined.

[0072] When the passenger compartment is in heat pump heating mode, the control system determines that the air conditioning system is in heating mode. At this time, it can determine the allowable high and low pressure ranges of the air conditioning system and the maximum permissible speed of the compressor. To prevent the compressor's suction pressure from falling below the limit threshold, causing it to run idling and be damaged by high load, the control system makes the following judgment: When the second actual pressure value at the low pressure end is lower than the fifth preset pressure value, if the passenger compartment's outlet air temperature has not yet reached the control target, the compressor will further increase the required speed to meet the passenger compartment's comfort. This increased suction action of the compressor leads to a continuous decrease in low pressure. To ensure the durability and lifespan of the compressor components, the control system will control the compressor's required speed to increase at a second rate to the compressor's maximum permissible speed when the second actual pressure value is lower than the fifth preset pressure value. If the second actual pressure value continues to decrease to the sixth preset pressure value, the control system maintains the required speed unchanged and outputs it through the LIN bus. If the second actual pressure value continues to decrease to the seventh preset pressure value, it decreases by a third step based on the currently calculated required speed within each unit calculation sequence. If the second actual pressure value still fails to rise and continues to decrease to the eighth preset pressure value, then within each unit calculation time, the pressure will decrease by a fourth step based on the currently calculated required speed. The preset pressure value and step size mentioned above need to be continuously tested and verified in advance in the environment of heat pump air conditioning test bench or whole vehicle ring mold test chamber to finally determine the final value.

[0073] This embodiment controls the compressor differently depending on the working mode of the refrigerant circuit of the air conditioning system. The control method of the compressor is somewhat different in different working modes. It can protect the compressor while ensuring its stable and safe operation, and at the same time reduce the number of compressor start-stop cycles without affecting the comfort of the passenger cabin.

[0074] This embodiment addresses compressors whose power is just sufficient to meet the pressure requirements of the air conditioning system. Therefore, frequent start-stop cycles can easily occur when the air conditioning system pressure is continuously rising or falling. For example, if the compressor's high-pressure protection threshold is 31 Pa, it may need to stop at 30 Pa and restart when the pressure drops below 30 Pa. Therefore, if no adjustment is made before the pressure reaches 30 Pa, the compressor will frequently reach 30 Pa, leading to frequent start-stop cycles. This embodiment regulates the air conditioning system pressure by adjusting the compressor speed before the pressure reaches 30 Pa, reducing the number of times the pressure reaches 30 Pa and thus avoiding frequent compressor start-stop cycles. If the compressor's power is too high, far exceeding the air conditioning system pressure, frequent compressor start-stop cycles will not occur, but this would be very costly.

[0075] Figure 3This is a schematic connection block diagram of an air conditioning compressor control system according to an embodiment of the present invention. Figure 3 As shown, in this embodiment, the air conditioning compressor control system 100 includes a control module 10. The control module 10 includes a memory 11 and a processor 12. The memory 11 stores a calculation program, which is executed by the processor to implement the control method described above. The processor 12 can be a central processing unit (CPU) or a digital processing unit, etc. The processor 12 sends and receives data through a communication interface. The memory 11 is used to store the program executed by the processor 12. The memory 11 can be any medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, or it can be a combination of multiple memories 11. The calculation program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or external storage 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 can be a vehicle body controller.

[0076] For the purposes of this embodiment, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples of computer-readable media (a non-exhaustive list) include: an electrical connection (electronic device) having one or more wires, a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, a computer-readable medium can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory 11.

[0077] This embodiment also provides a vehicle, which includes the control system 100 described above. Details regarding the control system 100 will not be provided here.

[0078] In this embodiment, the compressor speed can be controlled according to protection requirements based on different refrigerant operating modes, i.e., when the passenger compartment is cooling or heating. Simultaneously, preset pressure values ​​for different operating modes can be set separately according to the scenario and operating conditions to avoid a one-size-fits-all, crude control strategy. This reduces the frequency of compressor start-stop operations and better controls the temperature stability of the air conditioning outlet, improving passenger compartment comfort in summer or winter.

[0079] Compared with the prior art, the most important feature of this embodiment is that the control strategy does not conflict with the protection of the compressor and the comfort control of the passenger compartment. Moreover, the protection of the compressor is made into a dynamic and real-time adjustment process, avoiding the NVH noise, air conditioning outlet temperature and continuous oscillation of the entire system that cannot be converged caused by frequent compressor cut-off.

[0080] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control method for an air conditioning compressor, characterized in that, Includes the following steps: The operating mode and actual pressure value of the vehicle's air conditioning system are obtained, including the cooling mode and the heating mode. The actual pressure value is compared with multiple preset pressure values ​​according to the operating mode of the air conditioning system to determine which of the multiple preset pressure values ​​the actual pressure value reaches; the multiple preset pressure values ​​include a first pressure value group and a second pressure value group, and the actual pressure value includes a first actual pressure value at the high-pressure end and a second actual pressure value at the low-pressure end of the air conditioning system; this step specifically includes the following steps: when the air conditioning system is in cooling mode, the first actual pressure value at the high-pressure end is compared with the preset pressure value in the first pressure value group to determine which of the first actual pressure values ​​in the first pressure value group the first pressure value reaches; When the air conditioning system is in heating mode, the second actual pressure value at the low pressure end is compared with the preset pressure value in the second pressure value group to determine which of the second pressure value groups the second actual pressure value reaches. The preset pressure value in the second pressure value group is greater than the preset pressure value in the first pressure value group. The compressor speed of the air conditioning system is controlled according to the control strategy corresponding to the preset pressure value reached by the actual pressure value; this step specifically includes the following steps: when the air conditioning system is in cooling mode and the first actual pressure value at the high pressure end continues to rise, the compressor speed is controlled to increase, remain unchanged, or decrease. When the air conditioning system is in heating mode and the second actual pressure value at the low-pressure end continues to decrease, the compressor speed is controlled to increase, remain constant, or decrease. In this step: when the second actual pressure value at the low-pressure end decreases to the fifth preset pressure value in the second pressure value group, the compressor speed is controlled to increase at a second rate to the compressor's maximum permissible speed; when the second actual pressure value at the low-pressure end decreases to the sixth preset pressure value in the second pressure value group, the compressor speed is controlled to remain constant; when the second actual pressure value at the low-pressure end decreases to the seventh preset pressure value in the second pressure value group, the compressor speed is controlled to decrease, wherein the seventh preset pressure value is less than the sixth preset pressure value, and the sixth preset pressure value is less than the fifth preset pressure value.

2. The control method according to claim 1, characterized in that, The step of controlling the compressor speed to increase, remain constant, or decrease when the air conditioning system is in cooling mode and the first actual pressure value at the high-pressure end continues to rise specifically includes the following steps: When the first actual pressure value at the high-pressure end rises to the first preset pressure value in the first pressure value group, the speed of the compressor is controlled to rise at a first rate to the maximum permissible speed of the compressor. When the first actual pressure value at the high-pressure end rises to the second preset pressure value in the first pressure value group, the speed of the compressor is controlled to remain unchanged; When the first actual pressure value at the high-pressure end rises to the third preset pressure value in the first pressure value group, the 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.

3. The control method according to claim 2, characterized in that, The step of controlling the compressor speed to decrease when the first actual pressure value at the high-pressure end rises to the third preset pressure value in the first pressure value group specifically includes the following steps: When the first actual pressure value at the high-pressure end rises to the third preset pressure value, the speed of the compressor is controlled to decrease to the current required speed in a step-by-step manner. When the first actual pressure value at the high-pressure end rises to the fourth preset pressure value in the first pressure value group, the speed of the compressor is controlled to decrease to the current required speed in a second step, wherein the fourth preset pressure value is greater than the third preset pressure value, and the second step is greater than the first step.

4. The control method according to claim 1, characterized in that, The step of controlling the compressor speed to decrease when the second actual pressure value at the low-pressure end drops to the seventh preset pressure value in the second pressure value group specifically includes the following steps: When the second actual pressure value at the low-pressure end drops to the seventh preset pressure value, the speed of the compressor is controlled to decrease in a third step to the current required speed. When the second actual pressure value at the low-pressure end drops to the eighth preset pressure value in the second pressure value group, the speed of the compressor is controlled to decrease to the current required speed in a fourth step, wherein the eighth preset pressure value is less than the seventh preset pressure value, and the fourth step is greater than the third step.

5. The control method according to claim 4, characterized in that, The required rotational speed is calculated based on the current actual air outlet temperature of the vehicle's passenger compartment and the target air outlet temperature of the evaporator within each unit calculation time period.

6. A control system for an air conditioning compressor, characterized in that, include: A control module, comprising a memory and a processor, wherein the memory stores a calculation program, which, when executed by the processor, is used to implement the control method according to any one of claims 1-5.

7. A vehicle, characterized in that, Includes the control system as described in claim 6.

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