Troubleshooting methods for vehicle thermal management systems

Abstract

The present invention relates to the technical field of thermal management systems, and in particular to a method for troubleshooting a vehicle thermal management system. The method comprises the following steps: real-time monitoring of the operating status of the vehicle thermal management system's passenger compartment temperature control circuit, battery temperature control circuit, and motor temperature control circuit; determining whether any of the passenger compartment temperature control circuit, battery temperature control circuit, or motor temperature control circuit has failed, and if so, proceeding to the next step; and determining whether the vehicle thermal management system's current operating mode has a backup operating mode, and if so, executing the backup operating mode. The present invention can effectively handle thermal management system faults and improve user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management systems, and in particular to a fault handling method for a vehicle thermal management system. Background Art

[0002] Commercial vehicles play a crucial role in logistics and transportation. Existing thermal management systems for new energy commercial vehicles primarily control the temperatures of the passenger compartment, battery, and motor. These systems include a battery temperature control circuit, a passenger compartment temperature control circuit, and a motor temperature control circuit. Adjusting the passenger compartment temperature control circuit ensures a suitable cabin temperature, ensuring a satisfying driving experience for the driver and accompanying passengers. The battery temperature control circuit regulates the battery temperature, while the motor temperature control circuit controls the motor temperature, ensuring that the motor and battery operate at optimal temperatures and guaranteeing overall vehicle performance. Furthermore, the battery, passenger compartment, and motor temperature control circuits can be selectively connected to each other, allowing for the reuse of battery and motor temperatures and improving the vehicle's energy recovery rate. Multiple circuits can also be used to dissipate heat quickly when necessary.

[0003] In existing technologies, thermal management systems may malfunction after a certain period of operation. However, when a component of a thermal management system malfunctions, an alarm is generally issued to alert the user, which can easily reduce the user experience.

[0004] Therefore, a vehicle thermal management system troubleshooting method is needed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a fault handling method for a vehicle thermal management system, which can effectively handle faults that occur in the thermal management system and improve user experience.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The troubleshooting method for the vehicle thermal management system includes the following steps:

[0008] Real-time detection of the operating status of the passenger compartment temperature control circuit, battery temperature control circuit, and motor temperature control circuit of the vehicle thermal management system;

[0009] Determining whether a fault occurs in the passenger compartment temperature control circuit, the battery temperature control circuit, and the motor temperature control circuit; if any of the circuits fails, proceeding to the next step;

[0010] It is determined whether the current operation mode of the vehicle thermal management system has a backup operation mode, and if so, the backup operation mode is executed.

[0011] Furthermore, in mode A, the motor temperature control circuit is connected to the passenger compartment temperature control circuit, and the heat in the motor temperature control circuit is used to heat the passenger compartment; when executing mode A, if the first water pump of the motor temperature control circuit fails, the backup operation mode of mode A is executed, and the backup operation mode of mode A is mode B. When executing mode B, the motor temperature control circuit is disconnected from the passenger compartment temperature control circuit, the passenger compartment air-conditioning system is turned on, and the passenger compartment heater on the passenger compartment temperature control circuit is in a heating working state.

[0012] Furthermore, in mode C, the motor temperature control circuit and the passenger compartment temperature control circuit are connected to cool the motor; when executing mode C, if the first water pump of the motor temperature control circuit fails, the first water pump is turned off and operation continues in the current mode.

[0013] Furthermore, in mode D, the battery air conditioning system and the passenger compartment air conditioning system are in a cooling state, and the motor is cooled through the battery temperature control circuit; when executing mode D, if the third water pump of the battery temperature control circuit fails, the thermal management system reports a fault and reminds you to inspect and repair the third water pump.

[0014] Furthermore, in mode E, the motor temperature control circuit is connected to the passenger compartment temperature control circuit, and the heat in the motor temperature control circuit is used to heat the passenger compartment, and the battery temperature control circuit cools the battery; when executing mode E, if the first water pump of the motor temperature control circuit fails, the backup operating mode of mode E is executed, and the backup operating mode of mode E is mode F. When executing mode F, the motor temperature control circuit is disconnected from the passenger compartment temperature control circuit, the passenger compartment air-conditioning system is turned on, the passenger compartment heater on the passenger compartment temperature control circuit is in a heating working state, and the battery temperature control circuit maintains its current state.

[0015] Furthermore, in mode G, the battery heater of the battery temperature control circuit is in a heating working state to heat the battery; when executing mode G, if the third water pump of the battery temperature control circuit fails, the backup operation mode of mode G is executed, and the backup operation mode of mode G is mode H. When executing mode H, the motor temperature control circuit is connected to the battery temperature control circuit, and the heat of the medium in the motor temperature control circuit is used to heat the battery.

[0016] Furthermore, in mode I, the battery temperature control circuit performs heat exchange with the passenger compartment air-conditioning system to heat the passenger compartment; when executing mode I, if the first compressor of the passenger compartment air-conditioning system fails, the backup operation mode of mode I is executed, and the backup operation mode of mode I is mode J. When executing mode J, the first compressor is shut down, and the passenger compartment heater on the passenger compartment temperature control circuit is in a heating working state.

[0017] Furthermore, in mode K, the battery temperature control circuit performs heat exchange with the passenger compartment air conditioning system and the battery air conditioning system to cool the battery; when executing mode K, if the first compressor of the passenger compartment air conditioning system fails, the first compressor is shut down, and the battery temperature control circuit and the battery air conditioning system both operate according to their current status.

[0018] Furthermore, in mode L, the passenger compartment air conditioning system is turned on to cool the passenger compartment, and at the same time, the battery temperature control circuit performs heat exchange with the passenger compartment air conditioning system and the battery air conditioning system to cool the battery; when executing mode L, if the second compressor of the battery air conditioning system fails, the second compressor is turned off, and the battery temperature control circuit and the passenger compartment air conditioning system both operate according to their current status.

[0019] Furthermore, in mode M, the passenger compartment heater of the passenger compartment temperature control circuit is in a heating working state, the passenger compartment air-conditioning system is turned on, and the battery heater of the battery temperature control circuit is in a heating working state to heat the battery; when executing mode M, if the first compressor of the passenger compartment air-conditioning system fails, the first compressor is turned off, and the passenger compartment temperature control circuit and the battery temperature control circuit operate according to the current state.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a vehicle thermal management system fault handling method that monitors the operating status of the vehicle's passenger compartment temperature control circuit, battery temperature control circuit, and motor temperature control circuit in real time. It also determines whether any of these circuits are faulty, and if so, proceeds to the next step. It also determines whether the vehicle's thermal management system's current operating mode has a backup mode, and if so, executes the backup mode. This method effectively handles thermal management system faults, reduces alarm frequency, and improves user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0023] Figure 1 It is a schematic diagram of a vehicle thermal management system of the present invention;

[0024] Figure 2 The present invention is a flowchart of a method for troubleshooting a vehicle thermal management system.

[0025] In the picture:

[0026] 1. Motor temperature control circuit; 11. First water pump; 12. Radiator; 13. Motor; 14. First evaporator; 15. First three-way control valve; 16. Second three-way control valve; 2. Passenger compartment temperature control circuit; 21. Second water pump; 22. Passenger compartment water mixer; 23. Passenger compartment heater; 24. Heater core; 25. Third three-way control valve; 3. Passenger compartment air conditioning system; 31. First compressor; 32. R / D module; 33. First condenser; 34. Cabin heater; 35. Cabin radiator; 4. Battery temperature control circuit; 41. Third water pump; 42. Battery heater; 43. Battery; 44. Fourth three-way control valve; 5. Battery air conditioning system; 51. Second compressor; 52. Second condenser; 53. Second evaporator; 6. First four-way control valve; 7. Second four-way control valve. DETAILED DESCRIPTION

[0027] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0028] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0029] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0030] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0031] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0032] like Figure 1 As shown, the vehicle thermal management system includes a passenger compartment temperature control loop 2, a battery temperature control loop 4, a motor temperature control loop 1, a battery air conditioning system 5, and a passenger compartment air conditioning system 3. The motor temperature control loop 1 includes a first water pump 11, a radiator 12, a motor 13, and a first evaporator 14, all connected in series. The first water pump 11 circulates coolant, thereby controlling the temperature of the motor 13. The passenger compartment temperature control loop 2 includes a second water pump 21, a passenger compartment water mixer 22, a passenger compartment heater 23, and a heater core 24, all connected in series. The second water pump 21 circulates coolant, and by controlling the activation of the passenger compartment heater 23, the coolant is heated, thereby controlling the temperature of the passenger compartment. The battery temperature control loop 4 includes a third water pump 41, a battery 43, and a battery heater 42, all connected in series. The third water pump 41 circulates coolant, dissipating heat from the battery 43. By controlling the activation of the battery heater 42, the coolant is heated, thereby heating the battery 43.

[0033] The passenger compartment air conditioning system 3 includes a first compressor 31, a first condenser 33, a cabin heater 34, an R / D module 32, and a cabin radiator 35. The first compressor 31, the R / D module 32, and the first condenser 33 are connected in series to form a circulation loop. When the cabin heater 34 is connected in series to the circulation loop, the first condenser 33 absorbs ambient temperature, thereby heating the passenger compartment through the compressor and cabin heater 34. When the cabin radiator 35 is connected in series to the circulation loop, the first condenser 33 performs cooling, thereby cooling the passenger compartment. The battery air conditioning system 5 includes a second compressor 51, a second evaporator 53, and a second condenser 52, which are connected in series in sequence. Cooling or heating can be achieved by controlling the second compressor 51.

[0034] A first three-way control valve 15 and a second three-way control valve 16 are connected in series in the motor temperature control circuit 1. The first port of the first three-way control valve 15 is connected to the motor 13, the second port of the first three-way control valve 15 is connected to the water inlet of the passenger compartment water mixer 22, and the third port of the first three-way valve is connected to the water outlet of the passenger compartment water mixer 22 and the radiator 12. The first port of the second three-way control valve 16 is connected to the first water pump 11, the second port of the second three-way control valve 16 is connected to the third port of the first three-way control valve 15, and the third port of the second three-way control valve 16 is connected to the radiator 12.

[0035] A third three-way control valve 25 is installed in series with the passenger compartment temperature control circuit 2. Its first port is connected to the battery 43, its second port is connected to the heater core 24, and its third port is connected to the second water pump 21. A fourth three-way control valve 44 is installed between the second evaporator 53 and the battery temperature control circuit 4. A first four-way control valve 6 and a second four-way control valve 7 are installed between the battery temperature control circuit 4, the first evaporator 14, and the motor temperature control circuit 1. A first port of the fourth three-way control valve 44 is connected to the battery 43 and the passenger compartment heater 23, a second port of the fourth three-way control valve 44 is connected to the second evaporator 53, a third port of the fourth three-way control valve 44 is connected to the third port of the first four-way control valve 6, a first port of the first four-way control valve 6 is connected to the first evaporator 14, a second port of the first four-way control valve 6 is connected to the motor 13, a fourth port of the first four-way control valve 6 is connected to the third port of the second four-way control valve 7, a first port of the second four-way control valve 7 is connected to the first water pump 11, a second port of the second four-way control valve 7 is connected to the first evaporator 14, and a fourth port of the second four-way control valve 7 is connected to the battery heater 42.

[0036] By controlling the first three-way control valve 15 , the second three-way control valve 16 , the third three-way control valve 25 , the fourth three-way control valve 44 , the first four-way control valve 6 , and the second four-way control valve 7 , in conjunction with the battery temperature control circuit 4 , the motor temperature control circuit 1 , the passenger compartment temperature control circuit 2 , the passenger compartment air conditioning system 3 , and the battery air conditioning system 5 , various heating and cooling modes can be achieved. The following provides some examples.

[0037] When the passenger compartment and the battery 43 are heated respectively, the passenger compartment air-conditioning system 3 is turned on, and the first condenser 33 absorbs ambient heat to heat the passenger compartment; the second water pump 21 and the battery heater 42 are turned on, the third port of the first four-way control valve 6 is connected to the fourth port, and the third port of the second four-way control valve 7 is connected to the fourth port, thereby increasing the temperature of the battery 43.

[0038] When the residual heat of the battery 43 is used to heat the passenger compartment, the third port of the first four-way control valve 6 is connected to the first port, and the second port of the second four-way control valve 7 is connected to the fourth port. The heat of the battery 43 is exchanged in the first evaporator 14, the first condenser 33 is closed, and the passenger compartment air-conditioning system 3 uses the heat of the battery 43 in the first evaporator 14 to heat the passenger compartment.

[0039] When utilizing heat from the motor 13 to heat the passenger compartment through the first evaporator 14 and simultaneously heat the battery 43, the first and third ports of the first three-way control valve 15 are connected, the first and second ports of the second three-way control valve 16 are connected, the first and second ports of the first four-way control valve 6 are connected, the first and second ports of the first four-way control valve 6 are connected, the third and fourth ports of the first four-way control valve 6 are connected, the first and second ports of the second four-way control valve 7 are connected, and the third and fourth ports of the second four-way control valve 7 are connected. Heat from the motor 13 is exchanged through the first heat exchanger. The passenger compartment air conditioning system 3 utilizes heat from the first evaporator 14 to heat the passenger compartment. The battery temperature control circuit 4 heats the battery 43. Alternatively, the first evaporator 14 can be connected in series to the battery temperature control circuit 4 by controlling the first and second four-way control valves 6 and 7, similarly utilizing heat from the motor 13 to heat the battery 43.

[0040] When the vehicle is running, in order to effectively handle the failure of the thermal management system and improve the user experience, such as Figure 1 and Figure 2 As shown, the present invention provides a method for troubleshooting a vehicle thermal management system. The method for troubleshooting a vehicle thermal management system comprises the following steps:

[0041] Real-time detection of the operating status of the passenger compartment temperature control loop 2, battery temperature control loop 4, and motor temperature control loop 1 of the vehicle thermal management system;

[0042] Determine whether the passenger compartment temperature control circuit 2, the battery temperature control circuit 4, and the motor temperature control circuit 1 are faulty. If any of them is faulty, proceed to the next step.

[0043] It is determined whether the current operation mode of the vehicle thermal management system has a backup operation mode, and if so, the backup operation mode is executed.

[0044] When a vehicle's thermal management system fails, it determines whether a backup operating mode is available. If so, it executes the backup mode. By switching to the backup mode, the vehicle's thermal management system can operate normally. This effectively addresses thermal management system failures, reduces alarm frequency, and improves the user experience.

[0045] Furthermore, in Mode A, the motor temperature control circuit 1 is connected to the passenger compartment temperature control circuit 2, utilizing heat from the motor temperature control circuit 1 to heat the passenger compartment. If the first water pump 11 of the motor temperature control circuit 1 fails during Mode A, the backup mode of Mode A is implemented. This backup mode is Mode B. In Mode B, the motor temperature control circuit 1 is disconnected from the passenger compartment temperature control circuit 2, the passenger compartment air conditioning system 3 is activated, and the passenger compartment heater 23 of the passenger compartment temperature control circuit 2 is in heating operation. Specifically, in Mode A, the first and second ports of the first three-way control valve 15 are connected, the first and second ports of the second three-way control valve 16 are connected, the second and third ports of the third three-way control valve 25 are connected, the second and fourth ports of the first four-way control valve 6 are connected, and the first and third ports of the second four-way control valve 7 are connected. If the first water pump 11 fails, heat from the motor 13 cannot be utilized to heat the passenger compartment. In this case, Mode B is implemented. In mode B, the motor temperature control circuit 1 no longer exchanges heat with the passenger compartment water mixer 22. Instead, the passenger compartment air conditioning system 3 is used, and the first condenser 33 absorbs ambient heat, and the passenger compartment is heated by the cabin heater 34 to ensure that the passenger compartment is at a suitable temperature.

[0046] Furthermore, in Mode C, the motor temperature control circuit 1 and the passenger compartment temperature control circuit 2 are connected to cool the motor 13. When executing Mode C, if the first water pump 11 of the motor temperature control circuit 1 fails, the first water pump 11 is shut down and operation continues in the current mode. In Mode C, the passenger compartment is heated by the heat of the motor 13, and the motor 13 is cooled. At this time, the first port of the first three-way control valve 15 is connected to the second port, the first port of the second three-way control valve 16 is connected to the third port, the second port of the third three-way control valve 25 is connected to the third port, the second port of the first four-way control valve 6 is connected to the fourth port, and the first port of the second four-way control valve 7 is connected to the third port. When the first water pump 11 fails, the motor temperature control circuit 1 cannot circulate independently, but the second water pump 21 can still drive the water circuit for circulation, so it can continue to operate in the current mode, but the heat dissipation effect of the motor 13 is reduced.

[0047] Furthermore, in Mode D, the battery air conditioning system 5 and the passenger compartment air conditioning system 3 are in a cooling state, cooling the motor 13 via the battery temperature control circuit 4. If the third water pump 41 of the battery temperature control circuit 4 fails during Mode D, the thermal management system will indicate a fault and prompt the vehicle to inspect and repair the third water pump 41. In Mode D, the first condenser 33 is connected in series with the first compressor 31 and the first evaporator 14. The first, second, and third ports of the fourth three-way control valve 44 are all connected. The first and third ports of the first four-way control valve 6 are connected, and the second and fourth ports of the second four-way control valve 7 are connected. Coolant in the battery temperature control circuit 4 is cooled via the first and second evaporators 14 and 53. If the third water pump 41 fails to operate, the battery 43 cannot be cooled, requiring the vehicle to be parked for cooling and inspection.

[0048] Furthermore, in Mode E, the motor temperature control circuit 1 is connected to the passenger compartment temperature control circuit 2, utilizing heat from the motor temperature control circuit 1 to heat the passenger compartment, while the battery temperature control circuit 4 cools the battery 43. If the first water pump 11 of the motor temperature control circuit 1 fails during Mode E, the backup mode of Mode E is implemented, which is Mode F. In Mode F, the motor temperature control circuit 1 is disconnected from the passenger compartment temperature control circuit 2, the passenger compartment air conditioning system 3 is activated, the passenger compartment heater 23 on the passenger compartment temperature control circuit 2 is in the heating state, and the battery temperature control circuit 4 remains in its current state. Specifically, in Mode E, the first and second ports of the first three-way control valve 15 are connected, the first and second ports of the second three-way control valve 16 are connected, the second and third ports of the third three-way control valve 25 are connected, the second and fourth ports of the first four-way control valve 6 are connected, and the first and third ports are connected. The first and third ports of the second four-way control valve 7 are connected, and the second and fourth ports are connected. When the first water pump 11 fails, the passenger compartment cannot be heated by the heat of the motor 13. In this case, mode F is executed to heat the passenger compartment by the passenger compartment air conditioning system 3 to ensure that the passenger compartment is at a suitable temperature.

[0049] Furthermore, in Mode G, the battery heater 42 of the battery temperature control circuit 4 is in a heating state, heating the battery 43. If the third water pump 41 of the battery temperature control circuit 4 fails during Mode G, the backup mode of Mode G is implemented. The backup mode of Mode G is Mode H. During Mode H, the motor temperature control circuit 1 is connected to the battery temperature control circuit 4, utilizing the heat of the medium in the motor temperature control circuit 1 to heat the battery 43. During Mode G, the first and third ports of the fourth three-way control valve 44 are connected, the third and fourth ports of the first four-way control valve 6 are connected, and the third and fourth ports of the second four-way control valve 7 are connected, utilizing the battery heater 42 to heat the battery 43. If the third water pump 41 fails at this point, heating of the battery 43 is impossible. At this time, mode H is executed, the first port of the first three-way control valve 15 is connected to the third port, the first port of the second three-way control valve 16 is connected to the second port, the first port of the first four-way control valve 6 is connected to the third port, and the second port is connected to the fourth port, the first port of the second four-way control valve 7 is connected to the second port, and the third port is connected to the fourth port, the heat of the motor 13 is used to heat the battery 43, and the first water pump 11 drives the coolant to circulate to ensure that the battery 43 can be heated.

[0050] Furthermore, in Mode I, the battery temperature control circuit 4 exchanges heat with the passenger compartment air conditioning system 3 to heat the passenger compartment. If the first compressor 31 of the passenger compartment air conditioning system 3 fails during Mode I, the backup mode of Mode I is implemented. This backup mode is Mode J. In Mode J, the first compressor 31 is shut down, and the passenger compartment heater 23 in the passenger compartment temperature control circuit 2 is in a heating state. In Mode I, the first compressor 31, the cabin heater 34, and the first evaporator 14 are connected in series. The first and third ports of the fourth three-way control valve 44 are connected, the first and third ports of the first four-way control valve 6 are connected, and the second and fourth ports of the second four-way control valve 7 are connected. Heat from the battery 43 is used to heat the passenger compartment. If the first compressor 31 fails, the passenger compartment temperature cannot be adjusted. Therefore, it is necessary to execute mode J. When executing mode J, the battery temperature control circuit 4 is disconnected from the first heat exchanger, the second port of the third three-way control valve 25 is connected to the third port, and the passenger compartment is heated by the passenger compartment heater 23 on the passenger compartment temperature control circuit 2.

[0051] Furthermore, in Mode K, the battery temperature control loop 4 exchanges heat with the passenger compartment air conditioning system 3 and the battery air conditioning system 5 to cool the battery 43. If the first compressor 31 of the passenger compartment air conditioning system 3 fails during Mode K, the first compressor 31 is shut down, and the battery temperature control loop 4 and the battery air conditioning system 5 operate according to their current state. In Mode K, the first condenser 33 is connected in series with the first compressor 31 and the first evaporator 14. The first, second, and third ports of the fourth three-way control valve 44 are all connected. The first and third ports of the first four-way control valve 6 are connected, and the second and fourth ports of the second four-way control valve 7 are connected. The coolant in the battery temperature control loop 4 is cooled by the first evaporator 14 and the second evaporator 53. If the first compressor 31 fails and cannot operate, the second compressor 51 can still operate to cool the battery 43.

[0052] Furthermore, in Mode L, the passenger compartment air conditioning system 3 is activated to cool the passenger compartment, while the battery temperature control circuit 4 exchanges heat with the passenger compartment air conditioning system 3 and the battery air conditioning system 5 to cool the battery 43. If the second compressor 51 of the battery air conditioning system 5 fails during Mode L, the second compressor 51 is shut down, and both the battery temperature control circuit 4 and the passenger compartment air conditioning system 3 operate according to their current state. In Mode L, the first condenser 33, the first compressor 31, the first evaporator 14, and the cabin radiator 35 are connected in series. The first, second, and third ports of the fourth three-way control valve 44 are all connected. The first and third ports of the first four-way control valve 6 are connected, and the second and fourth ports of the second four-way control valve 7 are connected. If the second compressor 51 fails, the first compressor 31 can still operate normally, thereby cooling the battery 43.

[0053] Furthermore, in mode M, the passenger compartment heater 23 of the passenger compartment temperature control circuit 2 is in the heating state, the passenger compartment air conditioning system 3 is turned on, and the battery heater 42 of the battery temperature control circuit 4 is in the heating state, heating the battery 43. If the first compressor 31 of the passenger compartment air conditioning system 3 fails during mode M, the first compressor 31 is shut down, and the passenger compartment temperature control circuit 2 and the battery temperature control circuit 4 continue to operate according to their current state. In mode M, the first condenser 33 absorbs ambient heat to heat the passenger compartment through the cabin heater 34. The second and third ports of the third three-way control valve 25 are connected, the third and fourth ports of the first four-way control valve 6 are connected, and the third and fourth ports of the second four-way control valve 7 are connected. If the first compressor 31 fails, the heating effect of the passenger compartment will be reduced, but it will not affect vehicle operation.

[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for troubleshooting a vehicle thermal management system, characterized in that: The steps include: Real-time detection of the operating states of a passenger compartment temperature control circuit (2), a battery temperature control circuit (4), and a motor temperature control circuit (1) of a vehicle thermal management system; Determining whether the passenger compartment temperature control circuit (2), the battery temperature control circuit (4), and the motor temperature control circuit (1) are faulty, and if any of them are faulty, proceeding to the next step; determining whether a current operating mode of the vehicle thermal management system includes a backup operating mode, and if so, executing the backup operating mode; The motor temperature control circuit (1) includes a first water pump (11), a radiator (12), a motor (13), and a first evaporator (14) connected in series in sequence; the passenger compartment temperature control circuit (2) includes a second water pump (21), a passenger compartment water mixer (22), a passenger compartment heater (23), and a heater core (24) connected in series in sequence; the battery temperature control circuit (4) includes a third water pump (41), a battery (43), and a battery heater (42) connected in series in sequence; The vehicle thermal management system further includes a passenger compartment air conditioning system (3) and a battery air conditioning system (5), wherein the passenger compartment air conditioning system (3) includes a first compressor (31), a first condenser (33), a cabin heater (34), an R / D module (32), and a cabin radiator (35); and the battery air conditioning system (5) includes a second compressor (51), a second evaporator (53), and a second condenser (52) connected in series. In mode A, the motor temperature control circuit (1) is connected to the passenger compartment temperature control circuit (2), and the heat in the motor temperature control circuit (1) is used to heat the passenger compartment; when executing mode A, if the first water pump (11) of the motor temperature control circuit (1) fails, the backup operation mode of mode A is executed, and the backup operation mode of mode A is mode B. When executing mode B, the motor temperature control circuit (1) is disconnected from the passenger compartment temperature control circuit (2), the passenger compartment air conditioning system (3) is turned on, and the passenger compartment heater (23) on the passenger compartment temperature control circuit (2) is in a heating working state; In mode E, the motor temperature control circuit (1) is connected to the passenger compartment temperature control circuit (2), and the heat in the motor temperature control circuit (1) is used to heat the passenger compartment, and the battery temperature control circuit (4) cools the battery (43); when executing mode E, if the first water pump (11) of the motor temperature control circuit (1) fails, the backup operation mode of mode E is executed, and the backup operation mode of mode E is mode F. When executing mode F, the motor temperature control circuit (1) is disconnected from the passenger compartment temperature control circuit (2), the passenger compartment air conditioning system (3) is turned on, the passenger compartment heater (23) on the passenger compartment temperature control circuit (2) is in a heating working state, and the battery temperature control circuit (4) maintains the current state; In mode G, the battery heater (42) of the battery temperature control circuit (4) is in a heating working state to heat the battery (43); when executing mode G, if the third water pump (41) of the battery temperature control circuit (4) fails, the backup operation mode of mode G is executed, and the backup operation mode of mode G is mode H. When executing mode H, the motor temperature control circuit (1) is connected to the battery temperature control circuit (4), and the heat of the medium in the motor temperature control circuit (1) is used to heat the battery (43); In mode I, the battery temperature control circuit (4) performs heat exchange with the passenger compartment air conditioning system (3) to heat the passenger compartment; when executing mode I, if the first compressor (31) of the passenger compartment air conditioning system (3) fails, the backup operation mode of mode I is executed, and the backup operation mode of mode I is mode J. When executing mode J, the first compressor (31) is shut down, and the passenger compartment heater (23) on the passenger compartment temperature control circuit (2) is in a heating working state.

2. The method for troubleshooting a vehicle thermal management system according to claim 1, characterized in that: In mode C, the motor temperature control circuit (1) and the passenger compartment temperature control circuit (2) are connected to cool the motor (13); when executing mode C, if the first water pump (11) of the motor temperature control circuit (1) fails, the first water pump (11) is turned off and operation continues in the current mode.

3. The method for troubleshooting a vehicle thermal management system according to claim 1, characterized in that: In mode D, the battery air conditioning system (5) and the passenger compartment air conditioning system (3) are in a cooling state, and the motor (13) is cooled through the battery temperature control circuit (4); when executing mode D, if the third water pump (41) of the battery temperature control circuit (4) fails, the thermal management system reports a fault and prompts the user to inspect and repair the third water pump (41).

4. The method for troubleshooting a vehicle thermal management system according to claim 1, characterized in that: In mode K, the battery temperature control circuit (4) performs heat exchange with the passenger compartment air conditioning system (3) and the battery air conditioning system (5) to cool the battery (43); when executing mode K, if the first compressor (31) of the passenger compartment air conditioning system (3) fails, the first compressor (31) is turned off, and the battery temperature control circuit (4) and the battery air conditioning system (5) both operate according to their current states.

5. The method for troubleshooting a vehicle thermal management system according to claim 1, characterized in that: In mode L, the passenger compartment air conditioning system (3) is turned on to cool the passenger compartment, and at the same time, the battery temperature control circuit (4) performs heat exchange with the passenger compartment air conditioning system (3) and the battery air conditioning system (5) to cool the battery (43); when executing mode L, if the second compressor (51) of the battery air conditioning system (5) fails, the second compressor (51) is turned off, and the battery temperature control circuit (4) and the passenger compartment air conditioning system (3) both operate according to the current state.

6. The method for troubleshooting a vehicle thermal management system according to claim 1, characterized in that: In mode M, the passenger compartment heater (23) of the passenger compartment temperature control circuit (2) is in a heating working state, the passenger compartment air conditioning system (3) is turned on, and the battery heater (42) of the battery temperature control circuit (4) is in a heating working state to heat the battery (43); when executing mode M, if the first compressor (31) of the passenger compartment air conditioning system (3) fails, the first compressor (31) is turned off, and the passenger compartment temperature control circuit (2) and the battery temperature control circuit (4) operate according to the current state.

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