Method and device for pressure anomaly self-recovery of heat pump system

Abstract

A pressure abnormality self-recovery method of a heat pump system comprises the following steps: S01, judging whether a passenger cabin is in a refrigeration state; S02, if the passenger cabin is in the refrigeration state, judging whether an inlet side pressure of a compressor is less than or equal to a first preset pressure; S03, if the inlet side pressure of the compressor is less than or equal to the first preset pressure, judging whether an outlet side pressure of the compressor is greater than a second preset pressure; S04, if the outlet side pressure of the compressor is greater than the second preset pressure, stopping the compressor and opening a second electromagnetic valve after an expansion valve performs an initialization action. The pressure abnormality self-recovery method of the heat pump system can automatically solve the problem of refrigeration failure of the heat pump system caused by pressure abnormality due to problems such as sticking of an electronic expansion valve and a mechanical reversing valve, reduces after-sales maintenance cost, and improves user driving experience. The application also provides a pressure abnormality self-recovery device of a heat pump system.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method and apparatus for self-recovery from pressure anomalies in a heat pump system. Background Technology

[0002] New energy vehicles are a new type of transportation that we are currently developing with all our might, and they are becoming increasingly popular.

[0003] Energy conservation is particularly important for new energy vehicles. These vehicles typically use high-pressure water heaters for winter heating, which come in three types: resistance mode; positive temperature coefficient (PTC) electric heaters; and resistance wire heaters. However, to meet the vehicle's heating needs in winter, these three types of high-pressure water heaters are energy-intensive and inefficient, leading to a sharp decrease in the vehicle's driving range in winter, contradicting energy conservation goals. Therefore, a new heating method is urgently needed to reduce overall vehicle energy consumption and improve efficiency; hence, manufacturers are currently focusing on heat pump systems.

[0004] Currently, vehicles equipped with heat pump systems often experience problems such as poor refrigerant flow, abnormal pressure, and refrigeration failure when the passenger compartment is cooled due to jamming of electronic expansion valves or mechanical reversing valves. These problems are mainly solved by replacing parts, resulting in high after-sales maintenance costs and a large number of market complaints due to refrigeration failure.

[0005] Chinese Patent CN 112519532 B discloses a diagnostic control method and device for a heat pump system. The method includes: acquiring current sensor signals of the heat pump system; diagnosing the heat pump system based on the current sensor signals to obtain a diagnostic result; activating a corresponding preset protection strategy when the diagnostic result is abnormal; and controlling the compressor in the heat pump system according to the preset protection strategy. Through this method, the current state of the heat pump air conditioner is acquired and diagnosed. When an abnormality is detected, a corresponding preset protection strategy is activated, thereby ensuring the reliable operation of the compressor, protecting the system from damage, and ensuring user comfort through timely diagnosis and activation of the preset protection strategy. This solves the technical problem of how to ensure the stable and reliable operation of a heat pump system.

[0006] However, the above-mentioned diagnostic and control methods for heat pump systems cannot solve the problem of self-recovery after the electronic expansion valve or mechanical reversing valve becomes stuck. Summary of the Invention

[0007] In view of this, the present invention provides a method and apparatus for self-recovery of pressure anomalies in a heat pump system. By initializing the expansion valve and opening the heating valve in the passenger compartment management circuit when the compressor is stopped, the pressure on the inlet and outlet sides of the compressor is balanced. Without manual operation, the problem of heat pump system cooling failure caused by pressure anomalies due to problems such as jamming of the expansion valve and mechanical reversing valve can be automatically solved, reducing after-sales maintenance costs and improving the user's driving experience.

[0008] A method for self-recovery from pressure anomalies in a heat pump system, the heat pump system including a passenger compartment thermal management circuit, the passenger compartment management circuit including a compressor, a reversing valve, an expansion valve, a dehumidifying valve and a heating valve, when the heat pump system is in cooling mode, the dehumidifying valve and the heating valve are closed, the expansion valve is open, and the refrigerant in the passenger compartment thermal management circuit flows from the compressor, through the reversing valve and the expansion valve in sequence, and back to the compressor, including the following steps: S01, determine whether the passenger compartment is in cooling mode; S02, if the passenger compartment is in cooling mode, determine whether the inlet pressure of the compressor is less than or equal to a first preset pressure; S03, if the inlet pressure of the compressor is less than or equal to the first preset pressure, determine whether the outlet pressure of the compressor is greater than a second preset pressure; S04, if the outlet pressure of the compressor is greater than the second preset pressure, the compressor stops, the expansion valve performs an initialization action and then opens the heating valve to balance the inlet pressure and the outlet pressure of the compressor.

[0009] According to the self-recovery method for pressure anomalies in the heat pump system of the present invention, under the cooling condition in the passenger compartment and other cabins, if a piston is in a compressed state and becomes stuck and cannot be reset, it will cause refrigerant circuit blockage. By initializing the expansion valve and opening the heating valve in the passenger compartment management circuit when the compressor is stopped, the pressure on the inlet and outlet sides of the compressor is balanced. Through the pressure self-recovery method, without manual operation, the problem of refrigerant circuit blockage caused by internal piston sticking in the expansion valve and mechanical reversing valve, which leads to pressure anomalies and failure of the heat pump system's cooling function, can be automatically solved. There is no need to replace parts to solve the cooling failure caused by valve sticking, which reduces after-sales replacement and repair costs and market complaint rates, and improves the user's driving experience.

[0010] In one embodiment, in step S02, it is further determined whether the duration for which the compressor inlet side pressure is less than or equal to the first preset pressure is greater than or equal to the first preset duration. In step S03, if the duration for which the compressor inlet side pressure is less than or equal to the first preset pressure is greater than or equal to the first preset duration, it is determined whether the compressor outlet side pressure is greater than the second preset duration.

[0011] Specifically, after the refrigerant is blocked, the compressor continues to work, and the pressure on the inlet side of the compressor continues to be evacuated, causing the pressure to drop. When the pressure drops to a first preset pressure, for example, below 100 kPa, and remains there for 19 to 11 seconds, the first preset duration is particularly preferably 10 seconds to prevent false triggering. If the pressure value is too low, it will damage the compressor during the evacuation process, and if the pressure value is too high, it will cause false triggering. The principle for determining the duration is the same as the principle for determining the pressure value.

[0012] In one embodiment, in step S03, it is further determined whether the duration for which the outlet pressure of the compressor is greater than the second preset pressure is greater than or equal to the second preset duration. In step S04, if the duration for which the outlet pressure of the compressor is greater than the second preset pressure is greater than or equal to the second preset duration, the compressor stops, and the second expansion valve performs an initialization action and then opens the heating valve.

[0013] Specifically, due to blockage, the pressure on the outlet side of the compressor will not be too low. The determination of the second preset pressure is the same as the determination of the first preset pressure. The determination of the second preset duration is the same as the determination of the first preset duration. It is mainly to prevent false triggering. The second preset pressure is preferably 500 kPa and lasts for 19 to 11 seconds. The second preset duration is especially preferably 10 seconds.

[0014] In one embodiment, in step S04, after the pressure balance between the compressor's inlet side and outlet side continues for a third preset duration, steps S01 to S04 are stopped.

[0015] In one embodiment, the third preset duration is 4 to 6 seconds.

[0016] Specifically, after the compressor stops and its speed drops to 0, when performing subsequent actions, the heating valve is opened, and the compressor is in working condition. A pressure difference will always exist between the compressor's inlet and outlet sides, making it impossible to determine if the pressure is balanced. After the compressor's actual speed reaches 0, an initialization action is performed on the electronic expansion valve, opening the heating valve for 4-6 seconds, preferably 5 seconds, to balance the pressure between the compressor's inlet and outlet sides, release the stuck piston, and ensure the compressor can start and the heat pump system operates normally. Too short an opening time for the heating valve is detrimental to pressure balance, while too long an opening time will affect passenger experience. When there is a pressure difference between the compressor's inlet and outlet sides, opening the heating valve will allow the inlet and outlet pressures to balance quickly. A long opening time has little impact on pressure recovery, while a short opening time may result in excessively long pressure recovery times. If the system pressure remains balanced between the compressor inlet and outlet pressures for 5 seconds with the heating valve open, the system pressure is considered normal, the piston jamming is resolved, and system misjudgment is avoided, preventing the fault from remaining unresolved.

[0017] In one embodiment, in step S04, if the inlet pressure and outlet pressure of the compressor do not reach equilibrium after the heating valve is opened, then steps S01 to S04 are repeated.

[0018] By repeatedly executing the self-recovery strategy a reasonable number of times, the effectiveness of self-recovery can be greatly improved and misjudgment can be avoided. Each time the self-recovery action is executed, the action count i = i + 1 is incremented.

[0019] In one embodiment, if the number of times steps S01 to S04 are repeated is greater than a preset number, then the execution of steps S01 to S04 is stopped.

[0020] If the number of actions performed exceeds 5 within the same ignition cycle, the self-recovery strategy is exited. In this case, the directional valve and / or expansion valve are completely blocked or damaged, and self-recovery will no longer be performed. After exiting the self-recovery strategy, each actuator maintains its original requested state.

[0021] In one embodiment, in step S04, if the inlet pressure and outlet pressure of the compressor are still not balanced when the heating valve remains open for a fourth preset time, then steps S01 to S04 are stopped.

[0022] In one embodiment, the fourth preset duration is 14 to 16 seconds, and is particularly preferably 15 seconds.

[0023] If the system pressure is not balanced within 15 seconds and the piston jamming is not reset, and the system pressure still cannot be balanced after waiting for a longer period of time, the action will be terminated based on the user's subjective experience, and the self-recovery strategy will end. After the self-recovery strategy is terminated, each actuator will maintain its original request state.

[0024] The second aspect of the present invention provides a pressure anomaly self-recovery device for a heat pump system, used to execute the aforementioned pressure anomaly self-recovery method for a heat pump system, comprising: a judgment module, used to determine whether the passenger compartment is in a cooling state, whether the low-pressure side pressure of the compressor is less than or equal to a first preset pressure, and whether the high-pressure side pressure of the compressor is greater than a second preset pressure; and a control module, used to control the compressor to stop and the expansion valve to perform initialization actions before opening the heating valve when the low-pressure side pressure of the compressor is less than or equal to the first preset pressure and the high-pressure side pressure of the compressor is greater than the second preset pressure.

[0025] According to the self-recovery device for pressure anomalies of the heat pump system of the present invention, by executing the above-described self-recovery method for pressure anomalies of the heat pump system, the problem of heat pump system cooling failure caused by pressure anomalies due to problems such as jamming of electronic expansion valve and mechanical reversing valve can be automatically solved, thereby reducing after-sales maintenance costs and improving the user's driving experience.

[0026] The self-recovery method and device for pressure anomalies in a heat pump system provided by this invention initializes the expansion valve and opens the heating valve in the passenger compartment management circuit when the compressor is stopped, thereby balancing the pressure on the inlet and outlet sides of the compressor. Without manual operation, it can automatically solve the problem of heat pump system cooling failure caused by pressure anomalies due to problems such as jamming of the expansion valve and mechanical reversing valve, reduce after-sales maintenance costs, and improve the user's driving experience. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This diagram illustrates the basic principle of a heat pump system.

[0029] Figure 2 The schematic diagram illustrates the control principle of the pressure anomaly self-recovery method for a heat pump system according to an embodiment of the present invention.

[0030] The following is supplementary explanation of the attached figures:

[0031] 101-Compressor; 102-Reversing valve; 103-Expansion valve; 104-Dehumidifier valve; 105-Heating valve; 106-In-vehicle condenser; 107-In-vehicle evaporator; 108-Integrated radiator; 109-Gas-liquid separator. Detailed Implementation

[0032] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" and the like should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0034] The terms “first,” “second,” “third,” “fourth,” etc., are merely used to distinguish elements with similar attributes, and do not indicate or imply relative importance or a specific order. Descriptions such as “S01,” “S02,” “S03,” “S04,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying their relative importance or indicating the order of execution of methods.

[0035] The term “include” or any other variation thereof is intended to cover non-exclusive inclusion, which includes not only the elements listed, but also other elements not expressly listed.

[0036] First Embodiment

[0037] like Figure 1 As shown, the heat pump system in this embodiment includes a passenger compartment thermal management circuit for cooling or heating to regulate the temperature of the passenger compartment. The passenger compartment thermal management circuit includes a compressor 101, an in-vehicle condenser 106, an in-vehicle evaporator 107, a reversing valve 102, and an integrated radiator 108. The reversing valve 102 is used to adjust the flow direction of the refrigerant in the passenger compartment thermal management circuit. The passenger compartment thermal management circuit also includes a gas-liquid separator 109, used to separate the refrigerant entering the compressor 101 into gas and liquid phases and to discharge the separated gaseous refrigerant to the compressor 101 to protect the compressor 101. The passenger compartment thermal management circuit also includes an expansion valve 103 for changing the pressure and temperature of the refrigerant, located between the gas-liquid separator 109 and the reversing valve 102.

[0038] When the heat pump system is in cooling mode, the dehumidification valve 104 is closed, the heating valve 105 is closed, and the expansion valve 103 is open. The refrigerant flow in the passenger compartment thermal management circuit is as follows: after flowing out of the compressor 101, it enters the vehicle condenser 106, flows into the reversing valve 102 and then flows out, then passes through the integrated radiator 108, then enters the gas-liquid separator 109 and then flows out, then passes through the expansion valve 103, flows into the reversing valve 102 and then flows out, then passes through the vehicle evaporator 107, then enters the gas-liquid separator 109 and then flows out, finally returning to the compressor 101.

[0039] like Figure 2 As shown, the pressure anomaly self-recovery method of the heat pump system of the present invention includes the following steps: S01, determining whether the passenger compartment is in a cooling state; S02, if the passenger compartment is in a cooling state, determining whether the inlet side pressure of the compressor 101 is less than or equal to a first preset pressure; S03, if the inlet side pressure of the compressor 101 is less than or equal to the first preset pressure, determining whether the outlet side pressure of the compressor 101 is greater than a second preset pressure; S04, if the outlet side pressure of the compressor 101 is greater than the second preset pressure, the compressor 101 stops, and after the expansion valve 103 performs an initialization action, the heating valve 105 is opened to balance the inlet side pressure and the outlet side pressure of the compressor 101.

[0040] According to the self-recovery method for pressure anomalies in a heat pump system according to an embodiment of the present invention, under cooling conditions in the passenger compartment or other cabins, if a piston is in a compressed state and becomes stuck and cannot be reset, it will cause refrigerant circuit blockage. By initializing the expansion valve 103 and opening the heating valve 105 in the passenger compartment thermal management circuit when the compressor 101 is stopped, the pressure on the inlet and outlet sides of the compressor 101 is balanced. Through the pressure self-recovery method, without manual operation, the problem of refrigerant circuit blockage caused by internal piston sticking of the expansion valve 103 and the mechanical reversing valve 102, which leads to pressure anomalies and failure of the heat pump system's cooling function, can be automatically solved. There is no need to replace parts to solve the cooling failure caused by valve sticking, which reduces after-sales replacement and repair costs and market complaint rates, and improves the user's driving experience.

[0041] like Figure 2As shown, specifically, in this embodiment, in step S02, it is further determined whether the duration for which the inlet side pressure of compressor 101 is less than or equal to the first preset pressure is greater than or equal to the first preset duration. In step S03, if the duration for which the inlet side pressure of compressor 101 is less than or equal to the first preset pressure is greater than or equal to the first preset duration, it is determined whether the outlet side pressure of compressor 101 is greater than the second preset duration. Specifically, after refrigerant blockage, compressor 101 continues to work, and the inlet side pressure of compressor 101 continues to be evacuated, resulting in a pressure drop. When the pressure drops to the first preset pressure, for example, below 100 kPa, and lasts for 19 to 11 seconds, the first preset duration is particularly preferably 10 seconds to prevent false triggering. If the pressure value is too low, it will damage compressor 101 during evacuation; if the pressure value is too high, it will cause false triggering. The principle for determining the duration is the same as the principle for determining the pressure value.

[0042] like Figure 2 As shown, specifically in this embodiment, in step S03, it is further determined whether the duration for which the outlet pressure of compressor 101 is greater than the second preset pressure is greater than or equal to the second preset duration. In step S04, if the duration for which the outlet pressure of compressor 101 is greater than the second preset pressure is greater than or equal to the second preset duration, then compressor 101 stops, and expansion valve 103 performs initialization and then opens heating valve 105. Specifically, due to blockage, the outlet pressure of compressor 101 will not be too low. The determination of the second preset pressure is the same as the determination of the first preset pressure, and the determination of the second preset duration is the same as the determination of the first preset duration. It is mainly to prevent false triggering. The second preset pressure is preferably 500 kPa and lasts for 19 to 11 seconds, and the second preset duration is particularly preferably 10 seconds.

[0043] like Figure 2As shown, specifically, in this embodiment, in step S04, after the pressure balance between the inlet side and outlet side of compressor 101 continues for a third preset time, steps S01 to S04 are stopped. In one embodiment, the third preset time is 4 to 6 seconds. Specifically, after compressor 101 stops and its speed drops to 0, when performing subsequent actions, heating valve 105 is opened, and compressor 101 is in working condition. There will always be a pressure difference between the inlet side and outlet side of compressor 101, making it impossible to determine whether the pressure is balanced. After the actual speed of compressor 101 reaches 0, an initialization action is performed on expansion valve 103, and heating valve 105 is opened for 4 to 6 seconds, preferably 5 seconds, to balance the pressure between the inlet side and outlet side of compressor 101, restore the stuck piston, and ensure that compressor 101 can start and the heat pump system operates normally. A short opening time for heating valve 105 is not conducive to pressure balance, while a long opening time will affect the passenger experience. When there is a pressure difference between the inlet and outlet sides of compressor 101, opening the heating valve 105 will cause the inlet and outlet pressures of compressor 101 to balance within a short time. If the heating valve 105 is open for too long, the impact on pressure recovery will be minimal; if it is open for too short a time, the pressure recovery time may be excessively long. If the system pressure remains balanced between the inlet and outlet pressures of compressor 101 for 5 seconds after opening the heating valve 105, the system pressure is considered normal, the piston jamming is resolved, and system misjudgment is avoided, preventing the fault from remaining unresolved.

[0044] Second Embodiment

[0045] like Figure 2 As shown, specifically, the only difference between the pressure anomaly self-recovery method of the heat pump system in this embodiment and the first embodiment described above is that, in step S04, if the inlet pressure and outlet pressure of the compressor 101 are still not balanced when the heating valve 105 remains open for a fourth preset time, then steps S01 to S04 are stopped. Specifically, in this embodiment, the fourth preset time is 14 to 16 seconds, and is particularly preferably 15 seconds.

[0046] Specifically, according to the self-recovery method for pressure anomalies in a heat pump system according to an embodiment of the present invention, if the system pressure has not been balanced within 15 seconds, the piston jamming has not been reset, and the system pressure still cannot be balanced after waiting for a longer period of time, the action is also exited based on the user's subjective experience, and the self-recovery strategy is terminated. After exiting the self-recovery strategy, each actuator maintains its original request state.

[0047] Third Embodiment

[0048] like Figure 2As shown, specifically, the only difference between the pressure anomaly self-recovery method of the heat pump system in this embodiment of the invention and the first embodiment described above is that, in step S04, if the inlet pressure and outlet pressure of the compressor 101 do not reach equilibrium after the heating valve 105 is opened, then steps S01 to S04 are repeated. Specifically, in this embodiment, if the number of times steps S01 to S04 are repeated is greater than a preset number, then steps S01 to S04 are stopped. The preset number is preferably 4 to 6 times, and more preferably 5 times.

[0049] Specifically, the pressure anomaly self-recovery method for a heat pump system according to an embodiment of the present invention can greatly improve the self-recovery effect and avoid misjudgment by repeatedly executing the self-recovery strategy a reasonable number of times. Each time the self-recovery execution action is entered, the execution action count i = i + 1. If the execution action count is greater than 5 times within the same ignition cycle, the self-recovery strategy is exited. In this case, the reversing valve 102 and / or the expansion valve 103 are completely blocked or damaged, and self-recovery execution ceases. After exiting the self-recovery strategy, each actuator maintains its original requested state.

[0050] Fourth embodiment

[0051] The pressure anomaly self-recovery device for a heat pump system according to an embodiment of the present invention is used to execute the pressure anomaly self-recovery method for a heat pump system described above, comprising: a judgment module, used to judge whether the passenger compartment is in a cooling state, whether the low-pressure side pressure of the compressor 101 is less than or equal to a first preset pressure, and whether the high-pressure side pressure of the compressor 101 is greater than a second preset pressure; and a control module, used to control the compressor 101 to stop and the expansion valve 103 to perform initialization actions and then open the heating valve 105 when the low-pressure side pressure of the compressor 101 is less than or equal to the first preset pressure and the high-pressure side pressure of the compressor 101 is greater than the second preset pressure.

[0052] According to the self-recovery device for pressure abnormality of the heat pump system of the present invention, by implementing the self-recovery method for pressure abnormality of the heat pump system in the above embodiment, the problem of heat pump system refrigeration failure caused by pressure abnormality due to problems such as jamming of expansion valve 103 and reversing valve 102 can be automatically solved, reducing after-sales maintenance costs and improving the user's driving experience.

[0053] As can be seen from the above embodiments, the self-recovery method and device for pressure anomalies in the heat pump system involved in this invention initializes the expansion valve and opens the heating valve in the passenger compartment management circuit when the compressor stops, thereby balancing the pressure on the inlet and outlet sides of the compressor. Without manual operation, it can automatically solve the problem of heat pump system cooling failure caused by pressure anomalies due to problems such as jamming of electronic expansion valve and mechanical reversing valve, reduce after-sales maintenance costs, and improve the user's driving experience.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for self-recovery from pressure anomalies in a heat pump system, the heat pump system comprising a passenger compartment thermal management circuit, the passenger compartment thermal management circuit comprising a compressor (101), a reversing valve (102), an expansion valve (103), a dehumidifying valve (104), and a heating valve (105), wherein when the heat pump system is in cooling mode, the dehumidifying valve (104) and the heating valve (105) are closed, the expansion valve (103) is open, and the refrigerant in the passenger compartment thermal management circuit flows from the compressor (101) through the reversing valve (102) and the expansion valve (103) before returning to the compressor (101), characterized in that, The passenger compartment thermal management circuit also includes: an integrated radiator (108), a gas-liquid separator (109), and an in-vehicle evaporator (107); The refrigerant in the passenger compartment thermal management circuit flows out of the compressor (101) and passes sequentially through the reversing valve (102), the integrated radiator (108), the gas-liquid separator (109), the expansion valve (103), the reversing valve (102), the in-vehicle evaporator (107), and the gas-liquid separator (109) before returning to the compressor (101). One end of the heating valve (105) is connected between the reversing valve (102) and the integrated radiator (108), and the other end is connected between the gas-liquid separator (109) and the vehicle evaporator (107); The method includes the following steps: S01. Determine whether the passenger compartment is in a cooling state; S02. If the passenger compartment is in a cooling state, determine whether the inlet side pressure of the compressor (101) is less than or equal to the first preset pressure. S03. If the inlet pressure of the compressor (101) is less than or equal to the first preset pressure, then determine whether the outlet pressure of the compressor (101) is greater than the second preset pressure. S04. If the outlet pressure of the compressor (101) is greater than the second preset pressure, the compressor (101) stops, and the expansion valve (103) performs an initialization action and then opens the heating valve (105) to balance the inlet pressure of the compressor (101) and the outlet pressure of the compressor (101).

2. The self-recovery method for pressure anomalies in a heat pump system as described in claim 1, characterized in that, In step S02, it is also determined whether the duration for which the inlet side pressure of the compressor (101) is less than or equal to the first preset pressure is greater than or equal to the first preset duration. In step S03, if the duration of the inlet side pressure of the compressor (101) being less than or equal to the first preset pressure is greater than or equal to the first preset duration, then it is determined whether the outlet side pressure of the compressor (101) is greater than the second preset duration.

3. The self-recovery method for pressure anomalies in a heat pump system as described in claim 1 or 2, characterized in that, In step S03, it is also determined whether the duration for which the outlet pressure of the compressor (101) is greater than the second preset pressure is greater than or equal to the second preset duration. In step S04, if the duration of the outlet pressure of the compressor (101) being greater than the second preset pressure is greater than or equal to the second preset duration, the compressor (101) stops, and the expansion valve (103) opens the heating valve (105) after performing an initialization action.

4. The self-recovery method for pressure anomalies in a heat pump system as described in claim 1 or 2, characterized in that, In step S04, after the inlet pressure and outlet pressure of the compressor (101) remain in a balanced state for a third preset time, steps S01 to S04 are stopped.

5. The self-recovery method for pressure anomalies in a heat pump system as described in claim 4, characterized in that, The third preset duration is 4 to 6 seconds.

6. The self-recovery method for pressure anomalies in a heat pump system as described in claim 1 or 2, characterized in that, In step S04, if the inlet pressure and outlet pressure of the compressor (101) do not reach equilibrium after the heating valve (105) is opened, then steps S01 to S04 are repeated.

7. The self-recovery method for pressure anomalies in a heat pump system as described in claim 6, characterized in that, If the number of times steps S01 to S04 are repeated exceeds the preset number, then the execution of steps S01 to S04 will be stopped.

8. The self-recovery method for pressure anomalies in a heat pump system as described in claim 1 or 2, characterized in that, In step S04, if the inlet pressure and outlet pressure of the compressor (101) are still not balanced when the heating valve (105) remains open for a fourth preset time, then steps S01 to S04 are stopped.

9. The self-recovery method for pressure anomalies in a heat pump system as described in claim 8, characterized in that, The fourth preset duration is 14 to 16 seconds.

10. A pressure anomaly self-recovery device for a heat pump system, used to execute the pressure anomaly self-recovery method for a heat pump system according to any one of claims 1 to 9, characterized in that, include: The judgment module is used to determine whether the passenger compartment is in a cooling state, whether the low-pressure side pressure of the compressor (101) is less than or equal to the first preset pressure, and whether the high-pressure side pressure of the compressor (101) is greater than the second preset pressure. The control module is used to control the compressor (101) to stop and the expansion valve (103) to perform initialization actions and then open the heating valve (105) when the low-pressure side pressure of the compressor (101) is less than or equal to a first preset pressure and the high-pressure side pressure of the compressor (101) is greater than a second preset pressure.

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