Fault detection method for a thermal management system and vehicle

Abstract

The application provides a fault detection method of a thermal management system and a vehicle. The thermal management system comprises a compressor, and the method comprises the following steps: determining an operation mode of the thermal management system; and determining a fault of the thermal management system according to a pressure value of a sensor in the operation mode, a compressor operation state and a preset self-checking condition. The application controls the thermal management system to operate in the corresponding operation mode by determining the operation mode of the thermal management system, comprehensively determines a fault of a specific electric control valve in the thermal management system according to the pressure value collected by the sensor, the compressor operation state and the preset self-checking condition based on a system loop formed in the operation mode, realizes the fault self-checking function of the electric control valve by fully utilizing the existing sensor of the system, improves the fault troubleshooting efficiency of the thermal management system, and makes the troubleshooting process not dependent on manual operation and the pressure value less affected by environmental factors, so that the reliability and accuracy of fault detection are higher, and the cost of fault detection is lower.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a fault detection method and vehicle for a thermal management system. Background Technology

[0002] In related technologies, the fault detection method for electrically controlled valves in thermal management systems generally involves detecting the compressor casing temperature to determine whether the throttling device (including an electrically controlled valve) is faulty.

[0003] However, for thermal management systems containing multiple electrically controlled valves, the above-mentioned fault detection methods cannot detect faults in a single electrically controlled valve among the multiple valves, and cannot be applied to operating conditions where faults in electrically controlled valves do not cause changes in the compressor housing temperature. Furthermore, the temperature is greatly affected by environmental factors, resulting in low fault detection efficiency, reliability, and accuracy, as well as high costs. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this invention is to provide a fault detection method for a thermal management system that improves fault detection efficiency, reliability, and accuracy while reducing fault detection costs.

[0006] Therefore, a second objective of the present invention is to provide a vehicle.

[0007] To achieve the above objectives, a first aspect of the present invention provides a fault detection method for a thermal management system, the thermal management system including a compressor, the method comprising: determining the operating mode of the thermal management system; and determining a fault in the thermal management system based on the pressure value of a sensor under the operating mode, the operating status of the compressor, and preset self-test conditions.

[0008] According to the fault detection method of the thermal management system of the present invention, the thermal management system is controlled to operate in the corresponding operating mode by determining the operating mode of the thermal management system. Based on the system loop formed under the operating mode, a specific fault of an electrically controlled valve in the thermal management system is determined by comprehensively considering the pressure value collected by the sensor, the compressor operating status, and the preset self-test conditions. This realizes the self-test function of the electrically controlled valve by making full use of the existing sensors of the system, improving the fault diagnosis efficiency of the thermal management system. The diagnosis process does not rely on manual labor and the pressure value is less affected by environmental factors, resulting in higher reliability and accuracy of fault detection and lower cost of fault detection.

[0009] In some embodiments, determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when the first pressure value of the first sensor, the compressor operating status, and the operating status of the electric fan of the thermal management system meet the first preset self-test conditions under the cooling operating mode, determining a first type of electronically controlled valve cooling fault based on the second pressure value of the second sensor before the compressor stops and / or the compressor operating status after sending the first electronically controlled valve command. This achieves full utilization of existing sensors in the thermal management system, using the first electronically controlled valve command combined with the compressor operating status to determine whether other loops of the thermal management system are operating normally, thereby assisting in determining whether a specific electronically controlled valve in the first type of electronically controlled valve has a fault, and realizing the self-test of the first type of electronically controlled valve.

[0010] In some embodiments, determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when at least one of the first pressure value of the first sensor, the compressor operating status, and the operating status of the electric fan of the thermal management system under the cooling operating mode does not meet the first preset self-test conditions, and the second pressure value of the second sensor under the compressor operating status meets the first preset conditions, determining a second type of electronically controlled valve cooling fault based on the third pressure value of the third sensor and / or the opening status of the second electronically controlled valve under the compressor operating status, thereby making full use of the existing sensors in the thermal management system. Based on determining that the operating loop of the thermal management system is open, the fault of a specific electronically controlled valve in the second type of electronically controlled valve is determined by combining the pressure value and / or the opening status of the second electronically controlled valve, thereby realizing the fault self-test of the second type of electronically controlled valve and improving the fault diagnosis efficiency.

[0011] In some embodiments, determining the fault of the thermal management system's electronically controlled valve based on the sensor pressure value in the operating mode, the compressor operating status, and preset self-test conditions includes: when at least one of the first pressure value of the first sensor, the compressor operating status, and the operating status of the electronic fan in the thermal management system does not meet the first preset self-test condition in the cooling operation mode, and the second pressure value of the second sensor does not meet the first preset condition in the compressor operating status, and the actual evaporator outlet superheat, the second electronically controlled valve, and the third electronically controlled valve in the thermal management system meet the second preset self-test condition, a third type of electronically controlled valve cooling fault or a refrigerant fault in the thermal management system is determined based on the third pressure value of the third sensor and / or the third pressure value after sending a command to the third electronically controlled valve. This achieves full utilization of the existing sensors in the thermal management system, and by determining the actual evaporator outlet superheat and combining it with the command to the third electronically controlled valve to open and close the third electronically controlled valve, the thermal management system can operate under different loops. Furthermore, by combining the pressure value, it accurately determines whether a certain electronically controlled valve in the third type of electronically controlled valve has a fault, achieving self-testing of the third type of electronically controlled valve and improving the efficiency of electronically controlled valve fault diagnosis.

[0012] In some embodiments, the step of detecting faults in the thermal management system based on the pressure values ​​of sensors in the operating mode, the compressor operating status, and preset self-test conditions includes: when at least one of the first pressure value of the first sensor, the compressor operating status, and the operating status of the electric fan in the thermal management system does not meet the first preset self-test condition in the cooling operating mode, and the second pressure value of the second sensor in the compressor operating state does not meet the first preset condition, and the actual evaporator outlet superheat, the second solenoid valve, and the fourth solenoid valve in the thermal management system meet the third preset self-test condition, a fourth type of solenoid valve cooling fault or no fault alarm information is determined based on the compressor operating status. This achieves full utilization of existing sensors in the thermal management system. By determining the actual evaporator outlet superheat and combining it with the opening and closing conditions of the second and fourth solenoid valves meeting the third preset self-test condition, the thermal management system operates under different loops. Combined with the compressor operating status, it accurately determines whether a certain solenoid valve in the fourth type of solenoid valve has a fault, thereby achieving fault self-testing of the fourth type of solenoid valve.

[0013] In some embodiments, determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when the first pressure value of the first sensor and the compressor operating status meet the fourth preset self-test conditions under the heating mode, determining a fifth type of electrically controlled valve heating fault based on the first pressure value and compressor operating status after sending a fifth electrically controlled valve command. This achieves full utilization of existing sensors in the thermal management system, adds a heating circuit by sending a fifth electrically controlled valve command, and accurately determines whether a specific electrically controlled valve in the fifth type of electrically controlled valve has a heating fault by combining the pressure value and compressor operating status, thereby realizing the fault self-test of the fifth type of electrically controlled valve and improving the fault diagnosis efficiency of the electrically controlled valve.

[0014] In some embodiments, determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when at least one of the first pressure value of the first sensor and the compressor operating status under the heating mode does not meet the fourth preset self-test condition and the first pressure value meets the second preset condition, determining the heating fault of the sixth type of electrically controlled valve based on the third pressure value of the third sensor. This achieves full utilization of the existing sensors in the thermal management system, and by determining the change state of the pressure value, determines the heating fault of a specific electrically controlled valve in the sixth type of electrically controlled valve, realizes the fault self-test of the sixth type of electrically controlled valve, and improves the fault diagnosis efficiency of the electrically controlled valve.

[0015] In some embodiments, determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when at least one of the first pressure value of the first sensor and the compressor operating status in the heating mode does not meet the fourth preset self-test condition, and the first pressure value does not meet the second preset condition, and the fifth, third, and first electrically controlled valves meet the fifth preset self-test condition and the compressor is stopped, a seventh type of electrically controlled valve heating fault is determined based on the third pressure value. This achieves full utilization of existing sensors in the thermal management system, controls the opening and closing states of the fifth, third, and first electrically controlled valves through the fifth preset self-test condition, and combines the compressor operating status and the change state of the third pressure value to determine the heating fault of a specific electrically controlled valve in the seventh type of electrically controlled valve, realizing fault self-testing of the seventh type of electrically controlled valve and improving the self-testing efficiency of faulty valves.

[0016] In some embodiments, determining the thermal management system fault based on the sensor pressure value, the compressor operating status, and preset self-test conditions under the operating mode includes: when, under heating mode, at least one of the first pressure value of the first sensor and the compressor operating status does not meet the fourth preset self-test condition, and the first pressure value does not meet the second preset condition, and the fifth, third, and first electric control valves meet the fifth preset self-test condition, and the compressor has not stopped, and the sixth, second, fifth, and third electric control valves meet the sixth preset self-test condition, determining the thermal management system fault based on the compressor operating status and / or the fourth preset self-test condition. The second pressure value and / or the operating status of the fourth, sixth, second, and compressor control valves determine the heating faults of the eighth type of electrically controlled valves. This allows for full utilization of existing sensors in the thermal management system. By controlling the opening and closing states of the sixth, second, fifth, and third electrically controlled valves through the sixth preset self-test conditions, different circuits are formed. Combining the compressor operating status and / or the second pressure value and / or the operating status of the fourth, sixth, second, and compressor control valves, the heating faults of specific electrically controlled valves in the eighth type of electrically controlled valves are determined, enabling self-testing of faults in the eighth type of electrically controlled valves and improving the efficiency of fault diagnosis.

[0017] To achieve the above objectives, a second aspect of the present invention provides a vehicle comprising: a thermal management system; a processor, a memory, and a fault detection program for the thermal management system stored in the memory and executable on the processor, wherein the fault detection program for the thermal management system, when executed by the processor, implements a fault detection method for the thermal management system as described in any of the above embodiments.

[0018] According to the vehicle of the present invention, a fault detection program of the thermal management system stored in the memory and run on the processor is used to control the thermal management system to operate in the corresponding mode by determining the operating mode of the thermal management system. Based on the system loop formed in the operating mode, a specific electronically controlled valve fault in the thermal management system is determined by comprehensively considering the pressure value collected by the sensor, the compressor operating status, and the preset self-test conditions. This realizes the self-test function of the electronically controlled valve by making full use of the existing sensors of the system, improving the fault diagnosis efficiency of the thermal management system. The diagnosis process does not rely on manual labor and the pressure value is less affected by environmental factors, making the reliability and accuracy of fault detection higher and the cost of fault detection lower.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural block diagram of a thermal management system according to an embodiment of the present invention; Figure 2 This is a flowchart of a fault detection method for a thermal management system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the cooling mode operation circuit of a thermal management system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the heating mode operation circuit of a thermal management system according to an embodiment of the present invention; Figure 5 This is a detailed flowchart of a fault detection method for a thermal management system according to an embodiment of the present invention; Figure 6 This is a detailed flowchart of a fault detection method for a thermal management system according to another embodiment of the present invention.

[0021] Figure label: 1-Compressor; 2-External condenser; 3-Internal condenser; 4-Battery cooling plate; 5-Internal evaporator; 6-Refrigerator heat exchanger; 7-Gas-liquid separator; 8-Plate heat exchanger; 9-Heating electronic expansion valve; 10-Electronic expansion valve; 11-Battery cooling electronic expansion valve; 12-Large-diameter electronic expansion valve; 13-Evaporator outlet electronic expansion valve; 14-Evaporator inlet electronic expansion valve; 15-Refrigerator inlet electronic expansion valve; 16-First solenoid valve; 17-Second solenoid valve; 18-First check valve; 19-Second check valve; 20-Third check valve; 21-Compressor outlet PT sensor; 22-Battery cooling plate outlet PT sensor; 23-Evaporator outlet PT sensor; 24-Refrigerator outlet PT sensor; 25-Heat exchanger; 26-Electric fan; 27-Three-way water valve; 28-Water pump; 29-Motor; 100 - Crew compartment cooling and battery cooling circuit; 101 - Refrigeration operation circuit; 102 - Heating operation circuit. Detailed Implementation The embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present invention are described in detail below.

[0022] The fault detection method of the thermal management system in this embodiment of the invention is implemented based on the thermal management system, as described below. Figure 1 The thermal management system of this invention will be explained in detail.

[0023] like Figure 1 The diagram shown is a structural block diagram of a thermal management system according to an embodiment of the present invention.

[0024] The thermal management system is a direct cooling and direct heating system. Direct cooling and direct heating means that the refrigerant (i.e., the refrigerant medium) undergoes direct phase change and heat transfer in the heat exchanger to produce a cooling / heating effect. The system contains 7 electronic expansion valves (heating electronic expansion valve 9, electronic expansion valve 10, battery cooling electronic expansion valve 11, large-diameter electronic expansion valve 12, evaporator outlet electronic expansion valve 13, evaporator inlet electronic expansion valve 14, and refrigerator inlet electronic expansion valve 15), 2 solenoid valves (first solenoid valve 16 and second solenoid valve 17), and 3 check valves (first check valve 18, second check valve 19, and...). The third type of valve (20) includes both electronic expansion valves and solenoid valves, which can be called electrically controlled valves. In actual use, they can also be replaced with other electrically controlled valves, which is not limited here. One-way valves are structural components without electronic control devices, so their failure probability is low. Solenoid valves mainly function as on / off control system circuits. Because their function is relatively simple and their flow diameter is large when open, their failure rate is lower than that of electronic expansion valves. In this system, electronic expansion valves not only function as refrigerant on / off valves, but also regulate refrigerant flow by adjusting their opening degree. Because their flow diameter is small, they are more likely to become clogged than solenoid valves. In the thermal management system, each electronic expansion valve and solenoid valve has a fixed function. In a fixed mode, the open / closed state of each valve is fixed. Abnormal feedback from any single valve will manifest as no cooling / no heating (or the battery not heating / cooling, the refrigerator not cooling) at the user's end, and as abnormal pressure or temperature at the system end. Because there are many sensors in this system that can collect system operating parameters in real time, based on the system operating parameters and specific control commands, the software can automatically determine whether the valve body has a fault.

[0025] With the development of vehicle thermal management systems, such as air conditioning, which not only handles the cooling / heating of the passenger compartment but also needs to manage and regulate the temperature of the battery pack, and even... Figure 1 In the thermal management system, the air conditioner also performs the cooling function of the refrigerator. This highly coupled system has significant advantages in terms of heat exchange efficiency and cost reduction. By controlling the switching combinations of different valves (such as electrically controlled valves) in the thermal management system, it is possible to achieve passenger compartment cooling mode only, passenger compartment heating mode only, battery pack cooling mode only, battery pack heating mode only, refrigerator cooling mode only (where the refrigerator heating uses a heating film), and a combination of each independent mode in a dual-mode (such as passenger compartment cooling + battery cooling mode) and a triple-mode (passenger compartment cooling + battery cooling + refrigerator cooling mode). The system contains a total of 5 electronic expansion valves and 2 solenoid valves. The thermal management system undertakes many functions and has the above-mentioned multiple operating modes. The adjustment between different modes is mainly achieved by the regulation of each solenoid valve and electronic expansion valve. As can be seen from the system operating principle, the good working condition of each electrically controlled valve in the system is a prerequisite for ensuring the stable and reliable operation of the system.

[0026] In actual vehicle assembly / repair and system operation, valve malfunctions and thermal management system failures may occur due to internal blockages, valve unit failures, or loose wiring harness connectors. For example, water ingress and corrosion of the coil in the battery cooling electronic expansion valve 11 can cause the regulating function to fail, ultimately leading to the failure of the battery cooling / heating function; damage to the sealing ring of the second solenoid valve 7 can cause the valve's opening / closing function to fail, resulting in the failure of the refrigerator / passenger compartment / battery cooling function.

[0027] Therefore, fault detection of electronically controlled valves is crucial. Related technologies involve detecting the compressor casing temperature to determine if the throttling device (capillary tube or electronic expansion valve) in the air conditioning system is clogged, and then controlling the opening of the throttling device connected in parallel to it to ensure reliable system operation. Alternatively, manual fault detection can be performed by on-site technicians.

[0028] However, the aforementioned existing technology cannot detect a fault in a single electronically controlled valve among multiple electronically controlled valves, and it cannot be applied to operating conditions where a fault in an electronically controlled valve does not cause a change in the compressor housing temperature. For example, in the case of passenger compartment cooling + battery cooling, the corresponding operating circuit of the thermal management system is as follows: Figure 1 As shown in the passenger compartment cooling and battery cooling circuit 100, even if the evaporator outlet electronic expansion valve 13 is blocked, causing the refrigerant to stop flowing and resulting in the air conditioner not cooling, the compressor casing temperature will not change at this time because the refrigerant flowing on the battery cooling side is sufficient to maintain the compressor casing temperature within the normal range. Manual fault detection is limited by the store technicians' understanding of the operating principle of the thermal management system and the impact of abnormalities in various components on the system. Troubleshooting valve body faults usually requires a large cost (such as checking whether the valve body is blocked, which requires releasing refrigerant; if no problem is found, it is necessary to re-vacuum and recharge refrigerant; if the store cannot confirm, it may need to be escalated to R&D engineers through technical departments, and on-site troubleshooting may be required when communication is not smooth).

[0029] Therefore, the fault detection method of the thermal management system according to the embodiments of the present invention is adopted.

[0030] The following is combined with Figure 1-6 This invention describes a fault detection method for a thermal management system according to an embodiment of the present invention. For example... Figure 2 The diagram shows a flowchart of a fault detection method for a thermal management system according to an embodiment of the present invention. The fault detection method for a thermal management system according to this embodiment of the present invention includes at least steps S1 and S2.

[0031] Step S1: Determine the operating mode of the thermal management system.

[0032] In this embodiment, to ensure the safe operation of the thermal management system and the detection of electronically controlled valve faults under both high-temperature and low-temperature conditions, the fault detection logic for high-temperature and low-temperature conditions needs to be distinguished. Specifically, the electronically controlled valve detection logic for high-temperature conditions applies to situations where the ambient temperature is high and the thermal management system malfunctions when the cooling operation mode (including but not limited to passenger compartment cooling, battery cooling, and refrigerator cooling) fails. The electronically controlled valve detection logic for low-temperature conditions applies to situations where the ambient temperature is low and the thermal management system malfunctions when the heating mode (including but not limited to passenger compartment heating and battery heating) fails. The main reason for this distinction is that if the thermal management system is a heat pump system, operating it in a cooling circuit under low-temperature conditions may damage the compressor, a core component of the thermal management system. In specific implementations, electronically controlled valve fault detection can be performed according to the specific architecture of the thermal management system, and may be distinguished into the two types of electronically controlled valve detection logics mentioned above, or no distinction may be made. The above and following distinctions are only examples when the thermal management system is a heat pump system.

[0033] The operating mode of the thermal management system is determined. Specifically, when the temperature condition is high, such as when the ambient temperature is high due to failure of passenger compartment cooling, battery cooling, or refrigerator cooling, the operating mode of the thermal management system is determined to be cooling operation mode. When the temperature condition is low, such as when the ambient temperature is low due to failure of passenger compartment heating or battery heating, the operating mode of the thermal management system is determined to be heating mode to avoid damage to the compressor, the core component of the thermal management system, caused by the operation of the cooling circuit under low temperature conditions. By determining the operating modes of the thermal management system, it can operate in a cooling mode under high-temperature conditions, forming a cooling circuit, and perform fault detection on the electrically controlled valves based on the cooling circuit; under low-temperature conditions, it can operate in a heating mode, forming a heating circuit, and perform fault detection on the electrically controlled valves based on the heating circuit. This achieves an operating mode that matches the temperature conditions for fault detection of the electrically controlled valves, avoiding damage to components such as the compressor. It is understandable that when performing fault detection on the electrically controlled valves, if the matching relationship between the temperature conditions and the operating mode is not affected by the core components of the thermal management system, the operating mode can be left unrestricted, meaning the corresponding matching relationship between the temperature conditions and the operating mode is unconstrained.

[0034] Step S2: Determine the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode.

[0035] In this embodiment, after determining the operating mode as either cooling or heating, a command for a passenger compartment-only cooling or heating mode is first sent, causing the thermal management system (such as an air conditioning system) to operate in either mode, following either the cooling or heating loop. Based on the cooling or heating loop, sensors in the thermal management system collect pressure values. According to the pressure values, compressor operating status, and preset self-test conditions, the specific faulty electronically controlled valve in the thermal management system is determined. This fully utilizes existing sensors in the system. By sending commands to control the thermal management system to operate in the corresponding mode, and combining the pressure values ​​collected by the sensors with the preset self-test conditions, a comprehensive judgment is made on which electronically controlled valve is faulty, achieving a valve fault self-test function. This improves the fault diagnosis efficiency of the thermal management system in new energy vehicles. The diagnosis process is independent of manual labor, and the pressure values ​​are less affected by environmental factors, resulting in higher reliability and accuracy of fault detection, and lower fault detection costs.

[0036] For example, such as Figure 3 The diagram shown is a schematic of the cooling mode operation loop of a thermal management system according to an embodiment of the present invention. The first sensor is, for example, a compressor outlet PT (pressure-temperature sensor) sensor 21; the electric fan is, for example, an electric fan 26; the second sensor is, for example, an evaporator outlet PT sensor 23; and the evaporator outlet electronic expansion valve 13 (abbreviated as valve 13). The compressor operating state includes a protective shutdown state, and the electric fan operating state includes a non-fault state and a fault state. The preset self-test condition is that if the first pressure value of the first pressure sensor is too high, causing the compressor operating state to be in the protective shutdown state and the electric fan operating state to be in the non-fault state.

[0037] After determining the operating mode as the cooling operating mode, first send a command for the passenger compartment-only cooling mode to make the thermal management system (such as the air conditioning system) operate in the cooling operating mode. Then, the cooling operating circuit 101, i.e., the circuit compressor 1-first solenoid valve 16-external condenser 2-third one-way valve 20-evaporator inlet electronic expansion valve 14-internal evaporator 5-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, starts to operate.

[0038] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value, obtains the compressor operating status, and determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21, i.e., the first pressure value, being too high.

[0039] Since the high pressure may also be caused by a malfunction of the condenser-side electric fan 26, it is necessary to rule out the possibility of electric fan failure when performing this step of diagnosing the electric control valve. For example, when the electric fan is working in the cooling mode, it will generate a corresponding current. The operating current of the electric fan can be detected to determine whether the operating status of the electric fan is not faulty. The detection of the operating status of the electric fan is existing technology and will not be elaborated here.

[0040] When both of the above judgment steps are true, that is, when the first pressure value of the first pressure sensor is too high, causing the compressor to operate in a protective shutdown state and the electric fan to operate in a non-fault state, the first preset self-test condition is met. Because under normal circumstances, during compressor operation, the second pressure value collected by the evaporator outlet PT sensor 23 must be decreasing. If it does not decrease, it proves that valve 13 is faulty and valve 13 needs to be checked.

[0041] According to the fault detection method of the thermal management system of the present invention, the thermal management system is controlled to operate in the corresponding operating mode by determining the operating mode of the thermal management system. Based on the system loop formed under the operating mode, a specific fault of an electrically controlled valve in the thermal management system is determined by comprehensively considering the pressure value collected by the sensor, the compressor operating status, and the preset self-test conditions. This realizes the self-test function of the electrically controlled valve by making full use of the existing sensors of the system, improving the fault diagnosis efficiency of the thermal management system. The diagnosis process does not rely on manual labor and the pressure value is less affected by environmental factors, resulting in higher reliability and accuracy of fault detection and lower cost of fault detection.

[0042] In some embodiments, determining a thermal management system fault based on the pressure value of a sensor, the compressor operating status, and preset self-test conditions in the operating mode includes: when the first pressure value of the first sensor, the compressor operating status, and the operating status of the electronic fan of the thermal management system meet the first preset self-test conditions in the cooling operating mode, determining a first type of electronically controlled valve cooling fault based on the second pressure value of the second sensor before the compressor stops and / or the compressor operating status after sending the first electronically controlled valve command.

[0043] In an embodiment, such as Figure 3The diagram shown is a schematic of the cooling mode operation loop of a thermal management system according to an embodiment of the present invention. The first sensor includes, for example, a compressor outlet PT (pressure-temperature sensor) sensor 21; an electric fan includes, for example, an electric fan 26; a second sensor includes, for example, an evaporator outlet PT sensor 23; a first electrically controlled valve includes, for example, a second solenoid valve 17; and a first type of electrically controlled valve includes: an evaporator outlet electronic expansion valve 13 (abbreviated as valve 13), an evaporator inlet electronic expansion valve 14 (abbreviated as valve 14), and a first solenoid valve 16 (abbreviated as valve 16). The compressor operating state includes a protection shutdown state, and the electric fan operating state includes a non-fault state and a fault state. The first electrically controlled valve command is a command to open the first electrically controlled valve. The first preset self-test condition is that the first pressure value of the first pressure sensor is too high, causing the compressor operating state to be in the protection shutdown state and the electric fan operating state to be in the non-fault state.

[0044] After determining the operating mode as the cooling operating mode, first send a command for the passenger compartment-only cooling mode to make the thermal management system (such as the air conditioning system) operate in the cooling operating mode. Then, the cooling operating circuit 101, i.e., the circuit compressor 1-first solenoid valve 16-external condenser 2-third one-way valve 20-evaporator inlet electronic expansion valve 14-internal evaporator 5-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, starts to operate.

[0045] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value, obtains the compressor operating status, and determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21, i.e., the first pressure value, being too high.

[0046] Since the high pressure may also be caused by a malfunction of the condenser-side electric fan 26, it is necessary to rule out the possibility of electric fan failure when performing this step of diagnosing the electric control valve. For example, when the electric fan is working in the cooling mode, it will generate a corresponding current. The operating current of the electric fan can be detected to determine whether the operating status of the electric fan is not faulty. The detection of the operating status of the electric fan is existing technology and will not be elaborated here.

[0047] When both of the above judgment steps are true, that is, when the first pressure value of the first pressure sensor is too high, causing the compressor to operate in a protective shutdown state and the electric fan to operate in a non-fault state, the first preset self-test condition is met. Because under normal circumstances, during compressor operation, the second pressure value collected by the evaporator outlet PT sensor 23 must show a downward trend. If it does not decrease, it proves that valve 13 is faulty and needs to be checked. Therefore, based on the second pressure value collected by the second sensor (i.e., the evaporator outlet PT sensor 23) before the compressor stops, it is determined that the second pressure value has no downward trend and changes synchronously with the first pressure value. This indicates that valve 13 in the first type of electronically controlled valves is faulty. Valve 13 is checked to fully utilize the existing sensors in the thermal management system, accurately determine whether valve 13 is faulty through pressure value and compressor status, and achieve self-testing of valve 13. If the second pressure value collected by the evaporator outlet PT sensor 23 does not show an abnormally high value and has a downward trend, it proves that valve 13 is not faulty, and the valves that may be faulty are valve 14 or valve 16.

[0048] Based on the above, a command is sent to open the first electrically controlled valve, namely valve 17. If the compressor's operating status is no longer in the protection shutdown state after opening valve 17, it indicates that the thermal management system loop is open, proving that valve 16 is normal and valve 14 is faulty, thus confirming that valve 14 in the first type of electrically controlled valve has a refrigeration fault. If the fault still exists after opening valve 17, it indicates that valve 16 is faulty, thus confirming that valve 16 in the first type of electrically controlled valve has a refrigeration fault. This fully utilizes the existing sensors in the thermal management system, and by opening valve 17 in combination with the compressor's operating status, it determines whether other loops in the thermal management system are operating normally, thereby assisting in determining whether valve 14 or valve 16 is faulty, and realizing the self-test of valve 14 or valve 16.

[0049] In some embodiments, determining a thermal management system fault based on the pressure value of a sensor in the operating mode, the compressor operating status, and a preset self-test condition includes: when at least one of the first pressure value of a first sensor, the compressor operating status, and the operating status of the electric fan of the thermal management system in the cooling operating mode does not meet the first preset self-test condition, and the second pressure value of a second sensor in the compressor operating state meets the first preset condition, determining a second type of electronically controlled valve cooling fault based on the third pressure value of a third sensor and / or the opening state of a second electronically controlled valve in the compressor operating state.

[0050] In an embodiment, such as Figure 3The diagram shown is a schematic of the cooling mode operation loop of a thermal management system according to an embodiment of the present invention. The first sensor includes, for example, a compressor outlet PT (pressure-temperature sensor) sensor 21; an electric fan includes, for example, an electric fan 26; the second sensor includes, for example, an evaporator outlet PT sensor 23; the third sensor includes, for example, a battery cold plate cooling outlet PT sensor 22; the second type of electronically controlled valve includes, for example, an evaporator inlet electronic expansion valve 14 (abbreviated as valve 14); the second type of electronically controlled valve includes: a second solenoid valve 17 (abbreviated as valve 17), a heating electronic expansion valve 9 (abbreviated as valve 9), and an electronic expansion valve 10 (abbreviated as valve 10). The compressor operating state includes a protection shutdown state; the electric fan operating state includes a non-fault state and a fault state; the first preset self-test condition is that the first pressure value collected by the first pressure sensor is too high, causing the compressor operating state to be in the protection shutdown state and the electric fan operating state to be in the non-fault state; the first preset condition is that the first pressure value collected by the second pressure sensor is continuously greater than the upper limit of the pressure threshold for 3 minutes, where 3 minutes is only an example and can be determined according to requirements and experimental calibration in specific implementation.

[0051] After determining the operating mode as the cooling operating mode, first send a command for the passenger compartment-only cooling mode to make the thermal management system (such as the air conditioning system) operate in the cooling operating mode. Then, the cooling operating circuit 101, i.e., the circuit compressor 1-first solenoid valve 16-external condenser 2-third one-way valve 20-evaporator inlet electronic expansion valve 14-internal evaporator 5-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, starts to operate.

[0052] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value, obtains the compressor operating status, and determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21, i.e., the first pressure value, being too high.

[0053] Since the high pressure may also be caused by a malfunction of the condenser-side electric fan 26, it is necessary to rule out the possibility of electric fan failure when performing this step of diagnosing the electric control valve. For example, when the electric fan is working in the cooling mode, it will generate a corresponding current. The operating current of the electric fan can be detected to determine whether the operating status of the electric fan is not faulty. The detection of the operating status of the electric fan is existing technology and will not be elaborated here.

[0054] If the judgments in the above two steps are both negative, it indicates that the operating loop of the thermal management system is open. At this time, the second pressure value is collected by the PT sensor 23 at the evaporator outlet for judgment. If the collected second pressure value is continuously greater than the upper limit of the pressure threshold for 3 minutes, it proves that although the thermal management system loop is open, the cooling function of the thermal management system is still ineffective (no cooling effect when the evaporation pressure is high). It is necessary to further judge whether the third pressure value collected by the PT sensor 22 at the battery cold plate cooling outlet is consistent with the trend of the first pressure value collected by the PT sensor 21 at the compressor outlet. If it is, valve 10 is determined to be faulty. The reason is that the possible reason for the continuous abnormal second pressure value collected by the PT sensor 23 at the evaporator outlet is that the high temperature and high pressure refrigerant at the outlet of compressor 1 forms a loop through valve 10, large-diameter electronic expansion valve 12 (abbreviated as valve 12) and gas-liquid separator 7 (i.e., loop compressor 1-valve 10-valve 12-gas-liquid separator 7-compressor 1). This is to make full use of the existing sensors of the thermal management system. Based on the determination that the operating loop of the thermal management system is open, the pressure value is combined to determine that valve 10 in the second type of electronic control valve has a cooling failure, realize the self-check of valve 10, and improve the efficiency of fault diagnosis.

[0055] Because valve 10 is closed under normal refrigeration conditions, when the high-pressure refrigerant at the compressor outlet passes through valve 10, it causes the third pressure value collected by the PT sensor 22 at the battery cold plate cooling outlet to rise. If the third pressure value is not determined to be rising, it is necessary to further determine whether the opening state of valve 14 is continuously widened and reaches the maximum opening. This is because when valve 17 is open, the high-temperature refrigerant directly passes through valve 17 (the circuit is: compressor 1 - first solenoid valve 16 - external condenser 2 - third one-way valve 20 - second solenoid valve 17 - gas-liquid separator 7 - compressor 1), causing the pressure at PT22 to remain high. Due to the high pressure, the superheat at PT23 will not be too large, and valve 14 will not continue to open wide (valve 14 is adjusted according to the superheat at PT23; when the superheat determined by the actual collected pressure and temperature values ​​is greater than the target value, it will...). (Continuously open); However, when valve 9 malfunctions (the circuit is: compressor 1 - vehicle condenser 3 - heating electronic expansion valve 9 - plate heat exchanger 8 - evaporator inlet electronic expansion valve 14 - vehicle evaporator 5 - evaporator outlet electronic expansion valve 13 - gas-liquid separator 7 - compressor 1), the high temperature and high pressure of the refrigerant will cause the refrigerant before valve 14 to have no subcooling, resulting in insufficient refrigerant flow through valve 14, causing the superheat at the outlet of PT23 to be too large. At this time, valve 14 will continue to open until the maximum opening. Therefore, if it is determined that the opening state of valve 14 is continuously open and reaches the maximum opening, it proves that valve 9 is malfunctioning; otherwise, valve 17 is malfunctioning. This is to make full use of the existing sensors in the thermal management system, and accurately determine the specific electronic control valve malfunction in the second type of electronic control valve by determining the pressure value and the opening state of the second electronic control valve.

[0056] In some embodiments, determining a thermal management system electronic valve fault based on the pressure value of a sensor in the operating mode, the compressor operating status, and preset self-test conditions includes: when at least one of the first pressure value of the first sensor, the compressor operating status, and the operating status of the electronic fan in the thermal management system in the cooling operating mode does not meet the first preset self-test condition, and the second pressure value of the second sensor in the compressor operating state does not meet the first preset condition, and the actual evaporator outlet superheat, the second electronic valve, and the third electronic valve in the thermal management system meet the second preset self-test condition, a third type of electronic valve cooling fault or a thermal management system refrigerant fault is determined based on the third pressure value of the third sensor and / or the third pressure value after sending a command to the third electronic valve.

[0057] In an embodiment, such as Figure 3 The diagram shown is a schematic of the cooling mode operation loop of a thermal management system according to an embodiment of the present invention. The first sensor is, for example, a compressor outlet PT (pressure-temperature sensor) sensor 21; the electric fan is, for example, an electric fan 26; the second sensor is, for example, an evaporator outlet PT sensor 23; the third sensor is, for example, a battery cold plate cooling outlet PT sensor 22; the second electronically controlled valve is, for example, an evaporator inlet electronic expansion valve 14 (abbreviated as valve 14); the third electronically controlled valve is, for example, a large-diameter electronic expansion valve 12 (abbreviated as valve 12); the third type of electronically controlled valve includes: a battery cooling electronic expansion valve 11 (abbreviated as valve 11) and a large-diameter electronic expansion valve 12. The compressor's operating status includes a protection shutdown state and a normal operating state; the electric fan's operating status includes a non-fault state and a fault state; the first preset self-test condition is that the compressor's operating status is in the protection shutdown state and the electric fan's operating status is in the non-fault state when the first pressure value of the first pressure sensor is too high; the first preset condition is that the first pressure value collected by the second pressure sensor is continuously greater than the upper limit of the pressure threshold for 3 minutes, where 3 minutes is only an example and can be determined according to requirements and experimental calibration in specific implementation; the second preset self-test condition is: after the actual evaporator outlet superheat is greater than the target value and the second solenoid valve sends the maximum opening command, a command to open the third solenoid valve to the full opening is sent; the third solenoid valve command is the third solenoid valve closing command.

[0058] After determining the operating mode as the cooling operating mode, first send a command for the passenger compartment-only cooling mode to make the thermal management system (such as the air conditioning system) operate in the cooling operating mode. Then, the cooling operating circuit 101, i.e., the circuit compressor 1-first solenoid valve 16-external condenser 2-third one-way valve 20-evaporator inlet electronic expansion valve 14-internal evaporator 5-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, starts to operate.

[0059] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value, obtains the compressor operating status, and determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21, i.e., the first pressure value, being too high.

[0060] Since the high pressure may also be caused by a malfunction of the condenser-side electric fan 26, it is necessary to rule out the possibility of electric fan failure when performing this step of diagnosing the electric control valve. For example, when the electric fan is working in the cooling mode, it will generate a corresponding current. The operating current of the electric fan can be detected to determine whether the operating status of the electric fan is not faulty. The detection of the operating status of the electric fan is existing technology and will not be elaborated here.

[0061] If both of the above steps are negative, it indicates that the thermal management system's operating loop is open. At this point, the second pressure value collected by the evaporator outlet PT sensor 23 is used for judgment. If the collected second pressure value is continuously greater than the upper limit of the pressure threshold for 3 minutes, it is necessary to determine whether the actual superheat at the evaporator outlet is greater than the target value and whether valve 14 sends a command to the maximum opening. If the judgment is positive, because if valve 11 is abnormally open and valve 12 is closed, the system refrigerant will continuously be stored in the battery cold plate. The loop is compressor 1 - first solenoid valve 16 - external condenser 2 - third one-way valve 20 - second one-way valve 19 - battery cooling electronic expansion valve 11 - battery cold plate 4, resulting in insufficient refrigerant on the evaporator side. The superheat at the evaporator outlet PT sensor 23 is continuously high, and valve 14 gradually opens to its maximum state, thus sending a command to fully open valve 12. At this point, it is determined whether the deviation between the third pressure value collected by the battery cold plate cooling outlet PT sensor 22 and the second pressure value collected by the evaporator outlet PT sensor 23 is within ±0.05M. Pa (Under normal conditions, both sensors are in a conducting state, and the collected pressure values ​​should be basically consistent; ±0.05MPa is only an example here, and can be determined by requirements and experimental calibration in specific implementation). If this judgment is negative, it proves that valve 12 is not open and is judged to be a fault of valve 12. If the deviation between the collected third pressure value and the second pressure value is ±0.05MPa, a valve 12 closing command is sent again. If the third pressure value continues to rise, it proves that valve 11 is faulty and needs to be checked. If the third pressure value does not continue to rise, it proves that valve 11 and valve 12 are not the problem. At this time, it is necessary to further judge whether the system is faulty due to lack of refrigerant, etc., so as to make full use of the existing sensors of the thermal management system. By determining the actual evaporator outlet superheat and combining the third electric control valve command, the third electric control valve is opened and closed. This allows the thermal management system to operate under different loops. In addition, by combining the pressure value, it is possible to accurately judge whether a certain electric control valve in the third type of electric control valve is faulty, realize the self-test of the third type of electric control valve, and improve the efficiency of electric control valve fault diagnosis.

[0062] In some embodiments, detecting thermal management system faults based on sensor pressure values, compressor operating status, and preset self-test conditions under operating modes includes: when at least one of the first pressure value of the first sensor, compressor operating status, and operating status of the electric fan in the thermal management system fails to meet the first preset self-test condition under cooling operating mode, and the second pressure value of the second sensor fails to meet the first preset condition under compressor operating status, and the actual evaporator outlet superheat, the second solenoid valve, and the fourth solenoid valve in the thermal management system meet the third preset self-test condition, determining a fourth type of solenoid valve cooling fault or no fault alarm information based on the compressor operating status.

[0063] In an embodiment, such as Figure 3 The diagram shown is a schematic of the cooling mode operation loop of a thermal management system according to an embodiment of the present invention. The first sensor is, for example, a compressor outlet PT (pressure-temperature sensor) sensor 21; the electric fan is, for example, an electric fan 26; the second sensor is, for example, an evaporator outlet PT sensor 23; the second electronically controlled valve is, for example, an evaporator inlet electronic expansion valve 14 (abbreviated as valve 14); the fourth electronically controlled valve is, for example, a refrigerator inlet electronic expansion valve 15 (abbreviated as valve 15); the fourth type of electronically controlled valve includes: valve 15. The compressor operating status includes a protection shutdown state and a normal operating state; the electric fan operating status includes a non-fault state and a fault state; the first preset self-test condition is that the first pressure value of the first pressure sensor is too high, causing the compressor operating status to be in the protection shutdown state and the electric fan operating status to be in the non-fault state; the first preset condition is that the first pressure value collected by the second pressure sensor is continuously greater than the upper limit of the pressure threshold for 3 minutes, where 3 minutes is only an example and can be determined according to the requirements and experimental calibration in specific implementation; the third preset self-test condition is: after the actual evaporator outlet superheat is greater than the target value and the second electronic control valve sends the maximum opening command, it first sends the valve 15 opening command and then sends the valve 14 closing command.

[0064] After determining the operating mode as the cooling operating mode, first send a command for the passenger compartment-only cooling mode to make the thermal management system (such as the air conditioning system) operate in the cooling operating mode. Then, the cooling operating circuit 101, i.e., the circuit compressor 1-first solenoid valve 16-external condenser 2-third one-way valve 20-evaporator inlet electronic expansion valve 14-internal evaporator 5-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, starts to operate.

[0065] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value, obtains the compressor operating status, and determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21, i.e., the first pressure value, being too high.

[0066] Since the high pressure may also be caused by a malfunction of the condenser-side electric fan 26, it is necessary to rule out the possibility of electric fan failure when performing this step of diagnosing the electric control valve. For example, when the electric fan is working in the cooling mode, it will generate a corresponding current. The operating current of the electric fan can be detected to determine whether the operating status of the electric fan is not faulty. The detection of the operating status of the electric fan is existing technology and will not be elaborated here.

[0067] If the judgments in the above two steps are both negative, it indicates that the operating loop of the thermal management system is open. At this time, the second pressure value is collected by the PT sensor 23 at the evaporator outlet for judgment. If the collected second pressure value is not greater than the upper limit of the pressure threshold for 3 minutes, it is determined that the actual evaporator outlet superheat in the thermal management system, valve 14 and valve 15 meet the requirement that the actual evaporator outlet superheat is greater than the target value and valve 14 sends the maximum opening command. Then, the valve 15 opening command is sent first, and then the valve 14 closing command is sent to enable the system to execute the refrigerator cooling command to determine whether valve 15 is faulty. The corresponding loop is: compressor 1 - first solenoid valve 16 - external condenser 2 - third one-way valve 20 - refrigerator inlet electronic expansion valve 15 - refrigerator heat exchanger 6 - gas-liquid separator 7 - compressor 1. If the compressor stops under protective conditions (e.g., high-pressure protection and low-pressure protection) at this time, it indicates that valve 15 is faulty and needs to be checked. If the compressor is operating normally, there will be no fault alarm. This allows full use of the existing sensors in the thermal management system. By determining the actual evaporator outlet superheat and combining the opening and closing conditions of the second and fourth solenoid valves in the third preset self-test condition, the thermal management system can operate under different circuits. Combined with the compressor's operating status, it can accurately determine whether a certain solenoid valve in the fourth type of solenoid valve is faulty, thus achieving fault self-testing of the fourth type of solenoid valve.

[0068] In some embodiments, a thermal management system fault is determined based on the pressure value of the sensor in the operating mode, the compressor operating status, and preset self-test conditions, including: when the first pressure value of the first sensor and the compressor operating status in the heating mode meet the fourth preset self-test conditions, a fifth type of electric control valve heating fault is determined based on the first pressure value and the compressor operating status after sending the fifth electric control valve command.

[0069] In an embodiment, such as Figure 4The diagram shown is a schematic of the heating mode operation circuit of a thermal management system according to an embodiment of the present invention. The first sensor is, for example, the compressor outlet PT (Pressure-Temperature Sensor) sensor 21; the fifth electrically controlled valve is, for example, the first solenoid valve 16 (abbreviated as 16); the fifth type of electrically controlled valve includes: a second solenoid valve 17 (abbreviated as valve 17) and a heating electronic expansion valve 9 (abbreviated as valve 9). The compressor operating state includes a protection shutdown state and a normal operating state; the fourth preset self-test condition is that if the first pressure value of the first pressure sensor is too high, the compressor operating state will be in the protection shutdown state; the fifth electrically controlled valve command is the command to open valve 16.

[0070] After determining the operating mode as heating mode, first send a command for passenger cabin heating mode (such as heating mode) to start the heating mode, so that the thermal management system (such as the air conditioning system) operates in heating mode. Then, the heating operation circuit 102, i.e., the circuit compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-second solenoid valve 17-gas-liquid separator 7-compressor 1, starts to operate.

[0071] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value and obtains the compressor's operating status. It then determines whether the compressor is in a protective shutdown state due to an excessively high pressure signal (i.e., the first pressure value) collected by the compressor outlet PT sensor 21. If the determination is satisfied, a command to open valve 16 is sent, adding a circuit to the heating operation circuit 102: compressor 1 - first solenoid valve 16 - external condenser 2 - third one-way valve 20 - second solenoid valve 17 - gas-liquid separator 7 - compressor 1. Based on this, the compressor operating status is repeatedly determined to ensure that the compressor is in a protective shutdown state due to an excessively high pressure signal (i.e., the first pressure value) collected by the compressor outlet PT sensor 21. If satisfied, valve 17 is faulty and needs to be checked; if not satisfied, valve 9 is faulty and needs to be checked. This fully utilizes the existing sensors in the thermal management system, adds a heating circuit by sending a command to the fifth electrically controlled valve, and accurately determines whether a specific electrically controlled valve in the fifth category has a heating fault by combining the pressure value and the compressor's operating status. This achieves self-diagnosis of faults in the fifth category of electrically controlled valves and improves the efficiency of fault diagnosis for electrically controlled valves.

[0072] In some embodiments, determining a thermal management system fault based on the pressure value of a sensor in the operating mode, the compressor operating status, and preset self-test conditions includes: when at least one of the first pressure value of the first sensor and the compressor operating status in the heating mode does not meet the fourth preset self-test condition and the first pressure value meets the second preset condition, determining a sixth type of electronically controlled valve heating fault based on the third pressure value of the third sensor.

[0073] In an embodiment, such as Figure 4 As shown, the first sensor is, for example, the compressor outlet PT (Pressure-Temperature Sensor) sensor 21; the third sensor is, for example, the battery cold plate cooling outlet PT sensor 22; and the sixth type of electronically controlled valve includes: electronic expansion valve 10 (abbreviated as valve 10), large-diameter electronic expansion valve 12 (abbreviated as valve 12), and first solenoid valve 16 (abbreviated as valve 16). The compressor operating status includes a protection shutdown state and a normal operating state; the fourth preset self-test condition is that the compressor operating status is in the protection shutdown state when the first pressure value of the first pressure sensor is too high; the second preset condition is that the first pressure value collected by the first sensor does not exceed the minimum threshold for 5 minutes (where 5 minutes is an example, and the specific implementation can be determined according to requirements and experimental calibration, etc.).

[0074] After determining the operating mode as heating mode, first send a command for passenger cabin heating mode (such as heating mode) to start the heating mode, so that the thermal management system (such as the air conditioning system) operates in heating mode. Then, the heating operation circuit 102, i.e., the circuit compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-second solenoid valve 17-gas-liquid separator 7-compressor 1, starts to operate.

[0075] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value and obtains the compressor's operating status. It determines whether the compressor is in a protective shutdown state due to an excessively high pressure signal (i.e., the first pressure value) collected by the compressor outlet PT sensor 21. There are two reasons why the pressure at the compressor outlet PT sensor 21 may not increase. First, both valves 10 and 12 may be faulty and in the open state, forming a refrigerant "short circuit" loop from compressor 1 to electronic expansion valve 10, large-diameter electronic expansion valve 12, gas-liquid separator 7, and compressor 1, preventing the system pressure from increasing normally. Second, when valve 16 is faultily open, the compressor outlet pressure passes through valve 16 into the external condenser for heat exchange, forming a loop from compressor 1 to first solenoid valve 16, external condenser 2, third one-way valve 20, second solenoid valve 17, gas-liquid separator 7, and compressor 1. In low-temperature environments, the compressor outlet pressure cannot increase, and since the loop only has two solenoid valves without a throttling element, the pressure value collected by the compressor outlet PT sensor 21 also cannot increase normally. Therefore, if the condition is not met, the system will determine whether the first pressure value collected has not exceeded the minimum threshold for 5 minutes. If the condition is met, the system will further determine whether the third pressure value collected by the battery cold plate cooling outlet PT sensor 22 deviates from the first pressure value collected by the compressor outlet PT sensor 21 by ±0.02 MPa (which can be determined by experimental calibration and requirements, and is only an example here; it can also be ±0.05 MPa) and whether the trend of change is consistent. If the condition is met, it proves that valves 10 and 12 are faulty; if the condition is not met, it proves that valve 16 is faulty. This is to make full use of the existing sensors in the thermal management system, determine the heating fault of the specific electric control valve in the sixth category of electric control valves by determining the change state of the pressure value, realize the fault self-check of the sixth category of electric control valves, and improve the fault diagnosis efficiency of electric control valves.

[0076] In some embodiments, a thermal management system fault is determined based on the pressure value of the sensor, the compressor operating status, and preset self-test conditions under the operating mode, including: when at least one of the first pressure value of the first sensor and the compressor operating status under the heating mode does not meet the fourth preset self-test condition and the first pressure value does not meet the second preset condition, and the fifth, third, and first electric control valves meet the fifth preset self-test conditions and the compressor stops, a seventh type of electric control valve heating fault is determined based on the third pressure value.

[0077] In an embodiment, such as Figure 4As shown, the first sensor is, for example, the compressor outlet PT sensor 21; the third sensor is, for example, the battery cold plate cooling outlet PT sensor 22; and the seventh type of electronically controlled valve includes: battery cooling electronic expansion valve 11 (abbreviated as valve 11) and large-diameter electronic expansion valve 12 (abbreviated as valve 12). The compressor operating status includes a protection shutdown state and a normal operating state; the fourth preset self-test condition is that the compressor operating status is in the protection shutdown state when the first pressure value of the first pressure sensor is too high; the second preset condition is that the first pressure value collected by the first sensor does not exceed the minimum threshold for 5 minutes (where 5 minutes is an example, and can be determined according to requirements and experimental calibration in specific implementation); the fifth preset self-test condition is to first send the command to open valve 11 and valve 12, and then send the command to close valve 17.

[0078] After determining the operating mode as heating mode, first send a command for passenger cabin heating mode (such as heating mode) to start the heating mode, so that the thermal management system (such as the air conditioning system) operates in heating mode. Then, the heating operation circuit 102, i.e., the circuit compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-second solenoid valve 17-gas-liquid separator 7-compressor 1, starts to operate.

[0079] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value and obtains the compressor's operating status. It determines whether the compressor is in a protective shutdown state due to an excessively high pressure signal (i.e., the first pressure value) collected by the compressor outlet PT sensor 21. There are two reasons why the pressure at the compressor outlet PT sensor 21 may not increase. First, both valves 10 and 12 may be faulty and in the open state, forming a refrigerant "short circuit" loop from compressor 1 to electronic expansion valve 10, large-diameter electronic expansion valve 12, gas-liquid separator 7, and compressor 1, preventing the system pressure from increasing normally. Second, when valve 16 is faultily open, the compressor outlet pressure passes through valve 16 into the external condenser for heat exchange, forming a loop from compressor 1 to first solenoid valve 16, external condenser 2, third one-way valve 20, second solenoid valve 17, gas-liquid separator 7, and compressor 1. In low-temperature environments, the compressor outlet pressure cannot increase, and since the loop only has two solenoid valves without a throttling element, the pressure value collected by the compressor outlet PT sensor 21 also cannot increase normally. Therefore, if the condition is not met, the system checks whether the first pressure value collected has not exceeded the minimum threshold for 5 minutes. If the condition is not met, the system first sends a command to open valves 11 and 12, and then sends a command to close valve 17, forming a circuit from compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-battery cooling electronic expansion valve 11-large-diameter electronic expansion valve 12-gas-liquid separator 7-compressor 1. At this point, the system checks whether the compressor has stopped due to high pressure / low pressure protection. If so, the system further checks whether the third pressure value collected by the battery cold plate cooling outlet PT sensor 22 is consistently equal to that of the compressor outlet PT sensor 21. The system collects a first pressure value of ±0.1MPa (where ±0.1MPa is an example and can be determined according to requirements and experimental calibration in actual implementation) and the trend of change is consistent. If the judgment is yes, it proves that valve 12 is faulty and valve 12 needs to be checked. If the judgment is no, it proves that valve 11 is faulty and valve 11 needs to be checked. This is to make full use of the existing sensors in the thermal management system. By controlling the opening and closing status of the fifth, third, and first solenoid valves through the fifth preset self-test condition, and combining the compressor operating status and the change status of the third pressure value, the system can determine the heating fault of the specific solenoid valve in the seventh category of solenoid valves, realize the fault self-test of the seventh category of solenoid valves, and improve the self-test efficiency of faulty valves.

[0080] In some embodiments, determining a thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: when, under the heating mode, at least one of the first pressure value of the first sensor and the compressor operating status does not meet the fourth preset self-test condition and the first pressure value does not meet the second preset condition, and the fifth, third, and first electric control valves meet the fifth preset self-test condition and the compressor has not stopped, and the sixth, second, fifth, and third electric control valves meet the sixth preset self-test condition, an eighth type of electric control valve heating fault is determined based on the compressor operating status and / or the second pressure value and / or the fourth, sixth, second, and compressor operating status.

[0081] In an embodiment, such as Figure 4 As shown, the first sensor is, for example, compressor outlet PT sensor 21; the third sensor is, for example, battery cold plate cooling outlet PT sensor 22; the fifth electronically controlled valve is, for example, battery cooling electronic expansion valve 11 (abbreviated as valve 11); the third electronically controlled valve is, for example, large-diameter electronic expansion valve 12 (abbreviated as valve 12); the first electronically controlled valve is, for example, second solenoid valve 17 (abbreviated as valve 17); and the eighth type of electronically controlled valve includes: evaporator inlet electronic expansion valve 14 (abbreviated as valve 14), evaporator outlet electronic expansion valve 13 (abbreviated as valve 13), and refrigerator inlet electronic expansion valve 15 (abbreviated as valve 15). The compressor operating status includes a protection shutdown state and a normal operating state; the fourth preset self-test condition is that the compressor operating status is in the protection shutdown state when the first pressure value of the first pressure sensor is too high; the second preset condition is that the first pressure value collected by the first sensor does not exceed the minimum threshold for 5 minutes (where 5 minutes is an example, and can be determined according to requirements and experimental calibration, etc. in actual implementation); the fifth preset self-test condition is to first send the command to open valve 11 and valve 12, and then send the command to close valve 17; the sixth preset self-test condition is to first send the command to open valve 13 and valve 14, and then send the command to close valve 11 and valve 12.

[0082] After determining the operating mode as heating mode, first send a command for passenger cabin heating mode (such as heating mode) to start the heating mode, so that the thermal management system (such as the air conditioning system) operates in heating mode. Then, the heating operation circuit 102, i.e., the circuit compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-second solenoid valve 17-gas-liquid separator 7-compressor 1, starts to operate.

[0083] The first sensor, namely the compressor outlet PT sensor 21, collects the first pressure value and obtains the compressor's operating status. It then determines whether the compressor is in a protective shutdown state due to the pressure signal collected by the compressor outlet PT sensor 21 (i.e., the first pressure value) being too high. If the determination is not met, it then checks whether the collected first pressure value has not exceeded the minimum threshold for 5 minutes. If the determination is negative, first send the command to open valves 11 and 12, then send the command to close valve 17, forming the compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-battery cooling electronic expansion valve 11-large-diameter electronic expansion valve 12-gas-liquid separator 7-compressor 1 circuit. At this time, determine whether the compressor operation status has experienced a shutdown due to high pressure / low pressure protection. If not, first send the command to open valves 13 and 14, forming the compressor 1-in-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-evaporator inlet electronic expansion valve 14-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1 circuit. At this time, determine whether the compressor operation status has experienced a shutdown due to high pressure / low pressure protection. If yes, further determine whether the second pressure value collected by the evaporator outlet PT sensor 23 is consistently equal to the first pressure value collected by the compressor outlet PT sensor 21 ± 0.1 MPa (where ± 0.1 MPa is an example, and can be determined according to requirements and experimental calibration in actual implementation) and whether the trend of change is consistent. If the determination is yes, it proves that valve 13 is faulty and valve 13 needs to be checked; if the determination is no, it proves that valve 14 is faulty and valve 14 needs to be checked.

[0084] If the command to open valves 13 and 14 is sent first, forming a circuit of compressor 1-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-evaporator inlet electronic expansion valve 14-evaporator outlet electronic expansion valve 13-gas-liquid separator 7-compressor 1, and the result of judging whether the compressor operation status has stopped due to high pressure / low pressure protection is no, then the command to open valve 15 is sent first, forming a circuit of compressor 1-vehicle condenser 3-heating electronic expansion valve 9-plate heat exchanger 8-refrigerator inlet electronic expansion valve 15-refrigerator heat exchanger 6-gas-liquid separator 7-compressor 1, and the result of judging whether the compressor operation status has stopped due to high pressure / low pressure protection is no. If the judgment result is yes, then valve 15 is faulty and needs to be checked; if it is no, then it is judged to be fault-free and the entire judgment logic ends. This is to make full use of the existing sensors in the thermal management system, and to control the opening and closing states of the sixth, second, fifth and third solenoid valves through the sixth preset self-test conditions to form different loops. Combined with the compressor working status and / or the second pressure value and / or the fourth, sixth and second solenoid valves and the compressor working status, the heating fault of the specific solenoid valve in the eighth category of solenoid valves is determined, so as to realize the fault self-test of the eighth category of solenoid valves and improve the fault diagnosis efficiency of solenoid valves.

[0085] Furthermore, the thermal management system of the above embodiments is mainly responsible for battery cooling / heating, passenger compartment cooling / heating, and refrigerator cooling functions. When the system changes to other application scenarios, the cooling / heating objects undertaken by the heat exchanger will change, but the method of the above embodiments can still be applied. In addition, when the number of cooling / heating objects to be undertaken by the system increases (such as when there are other parallel systems outside the passenger compartment, battery pack, and refrigerator), the method of the above embodiments can also be applied.

[0086] The above embodiments refer to a system sensor PT, but the same applies when the system sensor uses an independent P or T.

[0087] The above describes the fault detection of the electronically controlled valve in this embodiment. It is a self-testing logic. The self-testing process does not require manual intervention and can be performed as a standalone logic test or combined with the fault self-testing of other components in the air conditioning thermal management system. The fault logic self-test can be started from professional equipment such as VDS (Vehicle Diagnostic System) or by the customer through a mobile APP (Application) or vehicle PAD (Tablet computer) panel.

[0088] The following is for reference. Figure 5 and Figure 6 The fault detection method of the thermal management system according to an embodiment of the present invention will be described in detail.

[0089] like Figure 5 The diagram shown is a detailed flowchart of a fault detection method for a thermal management system according to an embodiment of the present invention. Figure 6 The diagram shown is a detailed flowchart of a fault detection method for a thermal management system according to another embodiment of the present invention. When the operating mode is cooling mode, the fault detection method for the thermal management system of this embodiment includes steps S10-S37. When the operating mode is heating mode, the fault detection method for the thermal management system of this embodiment includes steps S50-S77.

[0090] The following is a fault detection method for the thermal management system of this invention when the operating mode is cooling operation mode.

[0091] Step S10, Begin.

[0092] Step S11: Send the crew cabin-only cooling mode command to start the cooling operation mode.

[0093] Step S12: Determine whether the compressor's operating state is in a protective shutdown state due to an excessively high first pressure value of the first sensor, and whether the electric fan is working normally. If yes, proceed to step S13; otherwise, proceed to step S19.

[0094] In step S13, during the operation of the compressor, the second pressure value collected by the second sensor does not show a decreasing trend and changes synchronously with the first pressure value collected by the first sensor.

[0095] Step S14, first type of electronic control valve (valve 13) refrigeration failure, check valve 13.

[0096] Step S15: Send the first electronically controlled valve command to open valve 17.

[0097] Step S16: Determine if the compressor is not in a protective shutdown state. If yes, proceed to step S17; otherwise, proceed to step S18.

[0098] Step S17, first type of electronically controlled valve (valve 16) refrigeration failure, check valve 16.

[0099] Step S18, first type of electronically controlled valve (valve 14) refrigeration failure, check valve 14.

[0100] Step S19: Determine if the second pressure value collected by the second pressure sensor remains greater than the upper limit of the pressure threshold for 3 minutes. If yes, proceed to step S20; otherwise, proceed to step S25.

[0101] Step S20: Determine whether the trend of the third pressure value collected by the third sensor is consistent with the trend of the first pressure value collected by the first sensor when the compressor is running. If yes, proceed to step S24; otherwise, proceed to step S21.

[0102] Step S21: Determine whether the opening state of the second solenoid valve (valve 14) is continuously increasing to the maximum opening. If yes, proceed to step S23; otherwise, proceed to step S22.

[0103] Step S22, the second type of electronically controlled valve (valve 17) has a refrigeration failure. Check valve 17.

[0104] Step S23, the second type of electronically controlled valve (valve 9) has a refrigeration failure. Check valve 9.

[0105] Step S24, the second type of electronically controlled valve (valve 10) has a refrigeration failure. Check valve 10.

[0106] Step S25: Determine if the actual evaporator outlet superheat in the thermal management system is greater than the target value and the second electrically controlled valve sends a command to the maximum opening degree. If yes, proceed to step S26; otherwise, proceed to step S33.

[0107] Step S26: Send a command to fully open the third electrically controlled valve.

[0108] Step S27: Determine if the third pressure value collected by the third sensor is equal to the second pressure value collected by the second sensor, with the collected pressure value ±0.05 MPa. If yes, proceed to step S28; otherwise, proceed to step S32.

[0109] Step S28: Send a command to close the third electrically controlled valve.

[0110] Step S29: Determine if the third pressure value collected by the third sensor continues to rise. If yes, proceed to step S31; otherwise, proceed to step S30.

[0111] Step S30: Check for refrigerant malfunction.

[0112] Step S31, the third type of electronically controlled valve (valve 11) refrigeration failure.

[0113] Step S32, the third type of electronically controlled valve (valve 12) has a refrigeration failure. Check valve 12.

[0114] Step S33: Send a command to open the fourth electrically controlled valve (valve 15).

[0115] Step S34: Send a command to close the second electrically controlled valve (valve 12).

[0116] Step S35: Determine the compressor's status as a protective shutdown. If yes, proceed to step S36; otherwise, proceed to step S37.

[0117] Step S36, fourth type of electronically controlled valve (valve 15) refrigeration failure, check valve 15.

[0118] Step S37, Valveless fault alarm information.

[0119] The following is a fault detection method for the thermal management system of this invention when the operating mode is heating mode.

[0120] Step S50, Begin.

[0121] Step S51: Send a command to activate the crew cabin heating mode only and start the heating mode.

[0122] Step S52: Determine whether the compressor's operating state is set to protective shutdown due to an excessively high first pressure value from the first sensor. If yes, proceed to step S53; otherwise, proceed to step S57.

[0123] Step S53: Send a command to the fifth electrically controlled valve (valve 16) to open valve 16.

[0124] Step S54: Determine whether the compressor's operating state has been shut down due to an excessively high first pressure value from the first sensor. If yes, proceed to step S55; otherwise, proceed to step S56.

[0125] Step S55, fifth type of electric control valve (valve 17) heating failure, check valve 17.

[0126] Step S56, fifth type of electric control valve (valve 9) heating failure, check valve 9.

[0127] Step S57: Determine if the first pressure value collected by the first pressure sensor has not exceeded the minimum threshold for 5 minutes. If yes, proceed to step S58; otherwise, proceed to step S61.

[0128] Step S58: Determine if the third pressure value collected by the third sensor is equal to the first pressure value collected by the first sensor ±0.05MPa and the trend of change is consistent. If yes, proceed to step S60; otherwise, proceed to step S59.

[0129] Step S59, heating failure of the sixth type of electrically controlled valve (valve 10 and valve 12), check valve 10 and valve 12.

[0130] Step S60, heating failure of the sixth type of electric control valve (valve 16), check valve 16.

[0131] Step S61: Send a command to open the fifth solenoid valve (valve 11) and the third solenoid valve (valve 12).

[0132] Step S62: Send a command to close the first electrically controlled valve (valve 17).

[0133] Step S63: Determine if the compressor has stopped due to high / low pressure protection, etc. If yes, proceed to step S64; otherwise, proceed to step S67.

[0134] Step S64: Determine if the third pressure value collected by the third sensor is equal to the first pressure value collected by the first sensor ±0.1 MPa and the trend of change is consistent. If yes, proceed to step S66; otherwise, proceed to step S65.

[0135] Step S65, heating failure of the seventh type of electric control valve (valve 11), check valve 11.

[0136] Step S66, heating failure of the seventh type of electric control valve (valve 12), check valve 12.

[0137] Step S67: Send a command to open the sixth solenoid valve (valve 13) and the second solenoid valve (valve 14).

[0138] Step S68: Send a command to close the fifth solenoid valve (valve 11) and the third solenoid valve (valve 12).

[0139] Step S69: Determine if the compressor has stopped due to high / low pressure protection, etc. If yes, proceed to step S70; otherwise, proceed to step S73.

[0140] Step S70: Determine if the second pressure value collected by the second sensor is consistently equal to the first pressure value collected by the first sensor ± 0.1 MPa. If yes, proceed to step S72; otherwise, proceed to step S71.

[0141] Step S71, heating failure of the eighth type of electrically controlled valve (valve 14), check valve 14.

[0142] Step S72, heating failure of the eighth type of electric control valve (valve 13), check valve 13.

[0143] Step S73: Send the command to open the fourth electrically controlled valve (valve 15).

[0144] Step S74: Send a command to open the sixth solenoid valve (valve 13) and the second solenoid valve (valve 14).

[0145] Step S75: Determine if the system is abnormal (compressor high / low pressure protection shutdown). If yes, proceed to step S76; otherwise, proceed to step S77.

[0146] Step S76, heating failure of the eighth type of electrically controlled valve (valve 15), check valve 15.

[0147] Step S77, no fault.

[0148] According to the fault detection method of the thermal management system of the present invention, the thermal management system is controlled to operate in the corresponding operating mode by determining the operating mode of the thermal management system. Based on the system loop formed under the operating mode, a specific fault of an electrically controlled valve in the thermal management system is determined by comprehensively considering the pressure value collected by the sensor, the compressor operating status, and the preset self-test conditions. This realizes the self-test function of the electrically controlled valve by making full use of the existing sensors of the system, improving the fault diagnosis efficiency of the thermal management system. The diagnosis process does not rely on manual labor and the pressure value is less affected by environmental factors, resulting in higher reliability and accuracy of fault detection and lower cost of fault detection.

[0149] The vehicle according to an embodiment of the present invention is described below.

[0150] The vehicle of this invention includes: a thermal management system; a processor, a memory, and a fault detection program for the thermal management system stored in the memory and executable on the processor. When the fault detection program for the thermal management system is executed by the processor, it implements a fault detection method for the thermal management system as described in any of the above embodiments.

[0151] According to the vehicle of the present invention, a fault detection program of the thermal management system stored in the memory and run on the processor is used to control the thermal management system to operate in the corresponding mode by determining the operating mode of the thermal management system. Based on the system loop formed in the operating mode, a specific electronically controlled valve fault in the thermal management system is determined by comprehensively considering the pressure value collected by the sensor, the compressor operating status, and the preset self-test conditions. This realizes the self-test function of the electronically controlled valve by making full use of the existing sensors of the system, improving the fault diagnosis efficiency of the thermal management system. The diagnosis process does not rely on manual labor and the pressure value is less affected by environmental factors, making the reliability and accuracy of fault detection higher and the cost of fault detection lower.

[0152] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0153] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fault detection method for a thermal management system, characterized in that, The thermal management system includes a compressor, and the method includes: Determine the operating mode of the thermal management system; The fault in the thermal management system is determined based on the pressure value of the sensor in the operating mode, the operating status of the compressor, and the preset self-test conditions.

2. The fault detection method for the thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: When the first pressure value of the first sensor, the operating status of the compressor, and the operating status of the electronic fan of the thermal management system meet the first preset self-test conditions in the cooling operation mode, the first type of electronic control valve cooling fault is determined based on the second pressure value of the second sensor before the compressor stops and / or the operating status of the compressor after sending the first electronic control valve command.

3. The fault detection method for the thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: If, during the cooling operation mode, at least one of the first pressure value of the first sensor, the operating status of the compressor, and the operating status of the electronic fan of the thermal management system fails to meet the first preset self-test condition, and the second pressure value of the second sensor meets the first preset condition during the compressor's operation, a second type of electronic control valve cooling fault is determined based on the third pressure value of the third sensor and / or the opening status of the second electronic control valve during the compressor's operation.

4. The fault detection method for the thermal management system according to claim 1, characterized in that, The step of determining the fault of the thermal management system's electronically controlled valve based on the sensor pressure value under the operating mode, the compressor's operating status, and preset self-test conditions includes: If, during the cooling operation mode, at least one of the following conditions is not met: the first pressure value of the first sensor, the operating status of the compressor, and the operating status of the electric fan of the thermal management system, and the second pressure value of the second sensor during the compressor operation mode is not met, and the actual evaporator outlet superheat, the second solenoid valve, and the third solenoid valve in the thermal management system meet the second preset self-test conditions, then a third type of solenoid valve cooling failure or a refrigerant failure in the thermal management system is determined based on the third pressure value of the third sensor 22 and / or the third pressure value after sending a command to the third solenoid valve.

5. The fault detection method for a thermal management system according to claim 1, characterized in that, The step of detecting faults in the thermal management system based on sensor pressure values, compressor operating status, and preset self-test conditions under the operating mode includes: If, during the cooling operation mode, at least one of the following conditions is not met: the first pressure value of the first sensor, the operating status of the compressor, and the operating status of the electronic fan of the thermal management system; and the second pressure value of the second sensor is not met during the compressor operation mode; and the actual evaporator outlet superheat, the second electronic control valve, and the fourth electronic control valve in the thermal management system meet the third preset self-test conditions, then a fourth type of electronic control valve cooling fault or no fault alarm information is determined based on the compressor operating status.

6. The fault detection method for a thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: When the first pressure value of the first sensor and the operating status of the compressor meet the fourth preset self-test conditions in the heating mode, the fifth type of heating fault of the electronic control valve is determined based on the first pressure value and the operating status of the compressor after sending the fifth electronic control valve command.

7. The fault detection method for a thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: If, in heating mode, at least one of the first pressure value of the first sensor and the compressor operating status does not meet the fourth preset self-test condition, and the first pressure value meets the second preset condition, a sixth type of electronic control valve heating fault is determined based on the third pressure value of the third sensor.

8. The fault detection method for a thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: If, in heating mode, at least one of the first pressure value of the first sensor and the compressor operating status does not meet the fourth preset self-test condition, and the first pressure value does not meet the second preset condition, and the fifth, third, and first electric control valves meet the fifth preset self-test condition, and the compressor stops, a seventh type of electric control valve heating fault is determined based on the third pressure value.

9. The fault detection method for a thermal management system according to claim 1, characterized in that, The step of determining the thermal management system fault based on the sensor pressure value, compressor operating status, and preset self-test conditions under the operating mode includes: If, in heating mode, at least one of the first pressure value of the first sensor and the compressor operating status does not meet the fourth preset self-test condition, and the first pressure value does not meet the second preset condition, and the fifth, third, and first electric control valves meet the fifth preset self-test condition, and the compressor is not stopped, and the sixth, second, fifth, and third electric control valves meet the sixth preset self-test condition, then an eighth type of electric control valve heating fault is determined based on the compressor operating status and / or the second pressure value and / or the fourth, sixth, second, and compressor operating status.

10. A vehicle, characterized in that, include: Thermal management system; A processor, a memory, and a fault detection program for a thermal management system stored in the memory and executable on the processor, wherein the fault detection program for the thermal management system, when executed by the processor, implements the fault detection method for the thermal management system as described in any one of claims 1-9.

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