Thermal management system fault diagnosis method and device, electronic equipment and storage medium

Abstract

The invention relates to the technical field of vehicle diagnosis, and provides a thermal management system fault diagnosis method and device, electronic equipment and a storage medium. According to the method, whether the thermal management system has a fault or not in the current operation mode is accurately determined through the heating value of the cooled device and the actual flow of the thermal management system, and the target fault performance of the thermal management system is obtained in the subsequent example to determine the fault diagnosis result, so that the fault diagnosis is more targeted; and the fault source can be more efficiently checked, the possibility of misjudgment and missed judgment is reduced, and the problems of long fault diagnosis time and poor fault diagnosis effect of the thermal management system in related technologies are avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle diagnosis technology, and in particular to a thermal management system fault diagnosis method, device, electronic device and storage medium. Background Art

[0002] With the continuous increase in automobile production and ownership, global warming, air pollution, and fossil energy reduction are becoming increasingly serious. Energy conservation and environmental protection have become one of the issues that need to be urgently addressed in current automobile research. Hybrid vehicles make full use of the working characteristics of engines, batteries, and motors, and can reasonably distribute energy. On the premise of meeting the requirements of vehicle power and driving performance, they can effectively improve fuel economy and clean environmental protection, reduce emissions, and are considered to be one of the effective ways to save energy and reduce emissions.

[0003] In order to improve the endurance of new energy vehicles, the thermal management system of new energy vehicles has also made great progress. Compared with the thermal management principles of traditional vehicles, the thermal management system of new energy vehicles introduces multi-way valves, heat pump air conditioners, water-cooled condensers, etc., forming a more complex thermal management system principle. By controlling the valve body, water pump, and compressor, multiple working modes such as single heat dissipation, single cooling and heating, and cooling + heat dissipation are formed.

[0004] Due to the large number of system components and complex working modes, when encountering problems such as excessive water temperature at the motor inlet causing power degradation, and inability to charge due to excessive charger temperature, it is necessary to start from multiple aspects such as whether the water pump communication power supply and valve body communication power supply are in place, internal blockage in the pipeline, false alarm of temperature sensor, etc., which often leads to a long time for thermal management system fault diagnosis and cannot accurately locate the specific cause of the thermal management system fault. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a thermal management system fault diagnosis method, device, electronic device and storage medium to solve the problems in the prior art that the thermal management system fault diagnosis time is long and the fault diagnosis effect is poor.

[0006] In a first aspect of an embodiment of the present application, a thermal management system fault diagnosis method is provided, the method comprising: during operation of the thermal management system of a vehicle, obtaining the heating value of a cooled object in the vehicle; if the heating value of the cooled object exceeds a preset heating value, obtaining the actual flow of a cooling circuit of the thermal management system in the current working mode; comparing the actual flow of the cooling circuit in the current working mode with a preset theoretical flow, if the comparison result of the actual flow of the cooling circuit and the theoretical flow in the current working mode indicates that there is a fault in the thermal management system, obtaining a target fault manifestation of the thermal management system in the current working mode; and determining a fault diagnosis result of the thermal management system according to the target fault manifestation.

[0007] According to a second aspect of an embodiment of the present application, a thermal management system fault diagnosis device is provided, which includes: an acquisition module, which is used to acquire the heating value of a cooled object in a vehicle during the operation of the thermal management system of the vehicle; if the heating value of the cooled object exceeds a preset heating value, then the actual flow of the cooling circuit of the thermal management system in the current working mode is acquired; a comparison module, which is used to compare the actual flow of the cooling circuit in the current working mode with a preset theoretical flow; if the comparison result of the actual flow of the cooling circuit and the theoretical flow in the current working mode indicates that there is a fault in the thermal management system, then the target fault manifestation of the thermal management system in the current working mode is acquired; and a diagnosis module, which is used to determine the fault diagnosis result of the thermal management system according to the target fault manifestation.

[0008] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0009] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, which stores a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0010] Compared with the prior art, the beneficial effects of the embodiments of the present application are as follows: the method in the embodiments of the present application obtains the heat value of the cooled object in the vehicle during the operation of the thermal management system of the vehicle; if the heat value of the cooled object exceeds the preset heat value, the actual flow of the cooling circuit of the thermal management system in the current working mode is obtained; the actual flow of the cooling circuit in the current working mode is compared with the preset theoretical flow, and if the comparison result of the actual flow of the cooling circuit and the theoretical flow in the current working mode indicates that there is a fault in the thermal management system, the target fault manifestation of the thermal management system in the current working mode is obtained; the fault diagnosis result of the thermal management system is determined according to the target fault manifestation, wherein the heat value of the cooled device and the actual flow of the thermal management system are used to accurately determine whether there is a fault in the thermal management system in the current operating mode, and subsequently this example obtains the target fault manifestation of the thermal management system to determine the fault diagnosis result, so that the fault diagnosis is more targeted, and the root cause of the fault can be more efficiently investigated, reducing the possibility of misjudgment and missed judgment; based on the combination of heat value, actual flow and target fault manifestation, the method can accurately determine the fault condition of the thermal management system in the current operating mode, greatly improving the accuracy and speed of fault diagnosis. This method ensures the reliability of the thermal management system under complex working conditions, provides strong protection for the safety and performance of the vehicle, and avoids the problems of long fault diagnosis time and poor fault diagnosis effect of the thermal management system in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a flow chart of a thermal management system fault diagnosis method provided in an embodiment of the present application;

[0013] Figure 2 It is a basic schematic diagram of a cooling circuit formed by a thermal management system provided in an embodiment of the present application;

[0014] Figure 3 It is a flow chart of another thermal management system fault diagnosis method provided in an embodiment of the present application;

[0015] Figure 4 It is a basic schematic diagram of another thermal management system forming a cooling circuit provided by an embodiment of the present application;

[0016] Figure 5 is a flow chart of another thermal management system fault diagnosis method provided in an embodiment of the present application;

[0017] Figure 6 This is a basic schematic diagram of a cooling circuit formed by another thermal management system provided in an embodiment of the present application;

[0018] Figure 7 It is a basic schematic diagram of another thermal management system forming a cooling circuit provided by an embodiment of the present application;

[0019] Figure 8 It is a flow chart of another thermal management system fault diagnosis method provided in an embodiment of the present application;

[0020] Fig. 9 It is a basic schematic diagram of a cooling circuit formed by another thermal management system provided in an embodiment of the present application;

[0021] Fig.10 is a flow chart of another thermal management system fault diagnosis method provided in an embodiment of the present application;

[0022] Fig.11 is a flow chart of another optional thermal management system fault diagnosis method provided in an embodiment of the present application;

[0023] Fig.12 is a flow chart of another optional thermal management system fault diagnosis method provided in an embodiment of the present application;

[0024] Fig.13 It is a structural schematic diagram of a thermal management system fault diagnosis device provided in an embodiment of the present application;

[0025] Fig.14 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0027] A thermal management system fault diagnosis method and device according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0028] Figure 1 A thermal management system fault diagnosis method provided by an embodiment of the present application is as follows: Figure 1 As shown, the method includes:

[0029] S101, during operation of the thermal management system of the vehicle, obtaining the heat generated by a cooled object in the vehicle;

[0030] S102, if the heat value of the object to be cooled exceeds the preset heat value, obtaining the actual flow rate of the cooling circuit of the thermal management system in the current working mode;

[0031] S103, comparing the actual flow of the cooling circuit in the current working mode with the preset theoretical flow, if the comparison result of the actual flow of the cooling circuit in the current working mode and the theoretical flow indicates that there is a fault in the thermal management system, then obtaining the target fault manifestation of the thermal management system in the current working mode;

[0032] S104: Determine a fault diagnosis result of the thermal management system according to the target fault manifestation.

[0033] It can be understood that the above method provided in this example is applied to vehicles, and the above vehicles include vehicles with automatic driving or intelligent driving (including vehicles with passenger functions (such as cars, buses, large buses, minibuses, etc.), vehicles with cargo functions (such as ordinary trucks, vans, trailers, closed trucks, tank trucks, flatbed trucks, container trucks, dump trucks, trucks with special structures), special vehicles (such as logistics distribution vehicles, automatic guided transport vehicles AGV, patrol cars, cranes, cranes, excavators, bulldozers, forklifts, rollers, loaders, off-road engineering vehicles, armored engineering vehicles, sewage treatment vehicles, sanitation vehicles, vacuum trucks, floor washing vehicles, sprinkler trucks, sweeping robots, food delivery robots, shopping guide robots, lawn mowers, golf carts, etc.), vehicles with entertainment functions (such as entertainment vehicles, amusement park automatic driving devices, balance cars, etc.), rescue vehicles (such as fire trucks, ambulances, power repair vehicles, engineering rescue vehicles, etc.)), etc.

[0034] The above-mentioned vehicle is provided with a thermal management system, which includes but is not limited to: multi-way valve, water pump, radiator, water-cooled condenser, water pump, drive motor and other thermal management devices; wherein, by modifying the valve connection method of the multi-way valve and / or the working state of each thermal management device in the thermal management system, different cooling circuits (thermal management circuits) can be formed, and different cooling circuits in the thermal management system correspond to different working modes.

[0035] For example, Figure 2 As shown, the thermal management system includes a multi-way valve, a water storage pot, a radiator, a water pump 1, a water pump 2, a water pump 3, a drive motor (the drive motor includes a front motor and a rear motor), a water-cooled condenser, a warm air core, a PTC, a battery, and a refrigerator. This example will illustrate the cooling circuit corresponding to some working modes in the cooling circuit; for example, taking the working mode of the thermal management system as the front motor cooling mode as an example, the multi-way valve connects valve 1 and valve 2, and the other valves are not connected, and the front motor is controlled to work, and the rear motor is not working. At this time, the multi-way valve, radiator, water storage pot, water pump 1, and the front motor in the thermal management system are connected in sequence to form the cooling circuit corresponding to the working mode. For another example, taking the working mode of the thermal management system as the motor preheating utilization mode as an example, the multi-way valve connects valve 1 and valve 4, and connects valve 3 and valve 5, and the other valves are not connected. At this time, the multi-way valve, water pump 1, the drive motor, the refrigerator, water pump 2, and the battery in the thermal management system are connected in sequence to form the cooling circuit corresponding to the working mode.

[0036] It can be understood that the cooling circuit corresponding to the working mode of the above-mentioned thermal management system is only used as an example, and the working mode corresponding to the thermal management system and the cooling circuit corresponding to the working mode can be flexibly set by relevant personnel according to actual needs.

[0037] It is understood that the thermal management system of a vehicle is used to cool down the components on the vehicle, including but not limited to: one or more of the engine, motor, battery pack, onboard electronic equipment, transmission, turbocharger, exhaust system, and brake system. Different operating modes of the thermal management system are used to cool down different components on the vehicle, and the cooling component corresponding to the current operating mode of the thermal management system is used as the cooling object.

[0038] It can be understood that when the vehicle's thermal management system is operating normally, the cooled object will continue to be cooled. Therefore, the heating value of the cooled object should be lower than the preset heating value, which is a heating value that does not affect the normal use of the cooled object (if the heating value of the cooled object is too large, it may easily cause damage or cause the working efficiency of the cooled object to decrease, affecting the normal use of the cooled object). If the heating value of the cooled object is higher than the preset heating value, it indicates that there may be an abnormality in the thermal management system.

[0039] Based on the above principle, this example will obtain the heat value of the cooled object in the vehicle. If the heat value of the cooled object exceeds the preset heat value, in order to further determine whether the thermal management system is faulty, this example will further obtain the actual flow of the cooling circuit of the thermal management system in the current working mode. The actual flow is the flow of the coolant when the drive motor in the thermal management system drives the coolant to cool the cooled object. If the heat value of the cooled object does not exceed the preset heat value, it indicates that there is no abnormality in the thermal management system and no subsequent actions will be performed.

[0040] After obtaining the above-mentioned actual flow, this example will compare the actual flow with the preset theoretical flow. The preset theoretical flow is the flow of the coolant when the thermal management system drives the motor to drive the coolant to cool the cooled object when it operates normally in the current working mode.

[0041] It can be understood that when the thermal management system is operating normally, the difference between the actual flow and the theoretical flow of the cooling circuit in the thermal management system should be within a certain range. If the difference between the actual flow and the theoretical flow exceeds a certain range, it indicates that the actual flow in the thermal management system has increased too much or decreased too much, and there is an abnormality. Based on the above principle, the actual flow will be compared with the theoretical flow in this example, where the actual flow is compared with the theoretical flow, including: obtaining the flow difference between the actual flow and the theoretical flow, if the absolute value of the flow difference is lower than the preset flow fluctuation value, then the comparison result of the actual flow and the theoretical flow indicates that there is no fault in the thermal management system; if the absolute value of the flow difference is higher than or equal to the preset flow fluctuation value, then the comparison result of the actual flow and the theoretical flow indicates that there is a fault in the thermal management system.

[0042] In some examples, if the comparison result between the actual flow rate and the theoretical flow rate indicates that there is a fault in the thermal management system, the target fault manifestation of the thermal management system in the current operating mode is obtained, and the fault diagnosis result of the thermal management system is determined based on the target fault manifestation. The target fault manifestation is used to characterize the abnormality of the thermal management system in the current operating mode. Determining the fault diagnosis result based on the target fault manifestation realizes fault diagnosis of the thermal management system based on the abnormality, making the fault diagnosis more targeted, and can more efficiently identify the root cause of the fault, reducing the possibility of misjudgment and missed judgment.

[0043] According to the technical solution provided in the embodiment of the present application, during the operation of the thermal management system of the vehicle, the heat value of the cooled object in the vehicle is obtained; if the heat value of the cooled object exceeds the preset heat value, the actual flow rate of the cooling circuit of the thermal management system in the current working mode is obtained; the actual flow rate of the cooling circuit in the current working mode is compared with the preset theoretical flow rate, and if the comparison result of the actual flow rate of the cooling circuit and the theoretical flow rate in the current working mode indicates that there is a fault in the thermal management system, the target fault manifestation of the thermal management system in the current working mode is obtained; the fault diagnosis result of the thermal management system is determined according to the target fault manifestation, wherein the heat value of the cooled device and the actual flow rate of the thermal management system are used to accurately determine whether there is a fault in the thermal management system in the current operating mode, and subsequently this example obtains the target fault manifestation of the thermal management system to determine the fault diagnosis result, so that the fault diagnosis is more targeted, and the root cause of the fault can be more efficiently investigated, reducing the possibility of misjudgment and missed judgment; based on the combination of heat value, actual flow rate and target fault manifestation, this method can accurately determine the fault condition of the thermal management system in the current operating mode, greatly improving the accuracy and speed of fault diagnosis. This method ensures the reliability of the thermal management system under complex working conditions, provides strong protection for the safety and performance of the vehicle, and avoids the problems of long fault diagnosis time and poor fault diagnosis effect of the thermal management system in related technologies.

[0044] In some embodiments, Figure 3 As shown, the target fault manifestation of the thermal management system in the current working mode is obtained, including:

[0045] S301, obtaining a target thermal management device of the thermal management system in a current working mode;

[0046] S302: Obtain a cooling temperature corresponding to each target thermal management component, and determine a target fault manifestation according to the cooling temperature and an actual flow rate of a cooling circuit in a current working mode.

[0047] Specifically, the cooling circuits composed of the thermal management system in different working modes contain different thermal management devices. In order to avoid adding temperature sensors at the inlet and outlet of each thermal management device, which leads to a waste of resources, this example will set temperature sensors at the inlet and outlet of some thermal management devices, and use the thermal management devices with temperature sensors as target thermal management devices. It can be understood that this example does not limit the number of target thermal management devices, which can be flexibly set by relevant personnel according to actual needs. Preferably, this example uses the drive motor and the radiator as the target thermal management devices.

[0048] This example also obtains the cooling temperature corresponding to each target thermal management device in the current operating mode of the thermal management system. The cooling temperature includes the inlet temperature and outlet temperature of the coolant when passing through the thermal management device, and determines the target fault manifestation based on the cooling temperature and the actual flow of the cooling circuit under the current operation.

[0049] Exemplarily, the current working mode of the thermal management system is the front motor cooling mode. At this time, the multi-way valve connects valve 1 and valve 2, and the other valves are not connected, and the front motor is controlled to work, while the rear motor is not working. At this time, the multi-way valve, radiator, water storage pot, water pump 1, and front motor in the thermal management system are connected in sequence to form a cooling circuit corresponding to the working mode, such as Figure 4 shown.

[0050] This example uses the drive motor and radiator as the target thermal management devices. This example will obtain the inlet temperature of the coolant when it passes through the front motor (denoted as T 11 ) and outlet temperature (T 12 ), the inlet temperature of the coolant passing through the front motor (denoted as T 01 ) and outlet temperature (T 02 ), the inlet temperature of the coolant after passing through the rear motor (denoted as T 21 ) and outlet temperature (T 22 ), the actual flow rate of the coolant passing through the target thermal management device can be determined according to the inlet temperature and outlet temperature of the target thermal management device. In this example, the actual flow rate of the coolant passing through the front motor is recorded as L 1实 , the actual flow rate of the coolant passing through the rear motor is recorded as L 2实 .

[0051] This example will convert the above T 11 、T 12 , L 1实 , L 2实 The parameters are compared with the preset corresponding thresholds to determine the target fault manifestation; specifically, if the comparison result is T 11 Above the preset temperature threshold, L 1实 <L 1理 And |L1实 -L 1理 |>Preset L 1实 and L 1理 The corresponding threshold, L 2实 >L 2理 And |L 2实 -L 2理 |>Preset L 2实 and L 2理 The corresponding threshold is 0 <L 1实 +L 2实 <L 1理 +L 2理 , the above abnormal parameters are used as the target fault manifestation. That is, the target fault manifestation is as follows:

[0052] T 11 Above a preset temperature threshold.

[0053] L 1实 <L 1理 And |L 1实 -L 1理 |>Preset L 1实 and L 1理 The corresponding threshold value indicates that the flow rate of the front motor branch is significantly low, and the water temperature passing through the front motor exceeds the standard due to the reduced flow rate.

[0054] L 2实 >L 2理 And |L 2实 -L 2理 |>Preset L 2实 and L 2理 The corresponding threshold value indicates that the flow rate of the rear motor branch increases, which may be caused by the blockage of the front motor branch.

[0055] 0 <L 1实 +L 2实 <L 1理 +L 2理 , it indicates that a branch may be blocked. Since one of the branches is blocked, the resistance of the entire system increases, so the main flow is less than the theoretical flow. However, since another branch is not blocked, the actual flow exists and is greater than 0.

[0056] According to the technical solution provided in the embodiment of the present application, the target thermal management device of the thermal management system in the current working mode is obtained; the cooling temperature corresponding to each target thermal management device is obtained, and the target fault manifestation is determined according to the cooling temperature and the actual flow rate of the cooling circuit in the current working mode, wherein, by obtaining the cooling temperature corresponding to the target thermal management device, the inlet temperature and outlet temperature of the target thermal manager can be accurately obtained, and then it can be determined whether the coolant received by the target thermal management device is normal and whether the coolant output by the target thermal management device is normal, thereby achieving accurate determination of the target fault manifestation of the thermal management system in the current working mode.

[0057] In some embodiments, Figure 5 As shown, the fault diagnosis result of the thermal management system is determined according to the target fault manifestation, including:

[0058] S501, obtaining a correspondence relationship between a preset fault manifestation and a fault cause, and querying the correspondence relationship between the preset fault manifestation and the fault cause through a target fault manifestation to obtain an initial fault cause corresponding to the target fault manifestation;

[0059] S502: If the number of the determined initial fault cause is one, the determined initial fault cause is used as the fault diagnosis result.

[0060] Specifically, in this example, a correspondence between fault manifestations and fault causes is pre-set in advance. Exemplarily, the correspondence between fault manifestations and fault causes is as follows:

[0061] For example, when the working mode of the thermal management system is single motor drive, fault manifestation 1 is:

[0062] T 11 Above a preset temperature threshold.

[0063] L 1实 <L 1理 And |L 1实 -L 1理 |>Preset L 1实 and L 1理 The corresponding threshold value indicates that the flow rate of the front motor branch is significantly low, and the water temperature passing through the front motor exceeds the standard due to the reduced flow rate.

[0064] L 2实 >L 2理 And |L 2实 -L 2理 |>Preset L 2实 and L 2理 The corresponding threshold value indicates that the flow rate of the rear motor branch increases, which may be caused by the blockage of the front motor branch.

[0065] 0 <L1实 +L 2实 <L 1理 +L 2理 , it indicates that a branch may be blocked. Since one of the branches is blocked, the resistance of the entire system increases, so the main flow is less than the theoretical flow. However, since another branch is not blocked, the actual flow exists and is greater than 0.

[0066] The cause of the fault corresponding to the above fault manifestation 1 is: the front motor branch is blocked due to pipe distortion or impurities.

[0067] For example, when the working mode of the thermal management system is single motor drive, fault manifestation 2 is:

[0068] T 11 Above a preset temperature threshold.

[0069] At the moment before the failure, |L 1实 -L 1理 | Smaller than the preset L 1实 and L 1理 The corresponding threshold value indicates that the flow of the front motor branch is normal.

[0070] At the moment before the failure, |L 2实 -L 2理 |<Preset L 2实 and L 2理 The corresponding threshold value indicates that the flow rate of the rear motor branch is normal.

[0071] The moment before the failure, |T 11 -T 12 |<The preset temperature threshold, T11 does not exceed the inlet limit temperature, indicating that the cooling circuit is cooling normally.

[0072] The fault cause corresponding to the above fault manifestation 2 is: T 12 Temperature sensor false alarm.

[0073] When the thermal management system works in the mode of front and rear motors driving together, fault manifestation 3:

[0074] T 11 Higher than the preset temperature threshold, T 12 Above a preset temperature threshold.

[0075] 0 <L 1实 <L 1理 (Theoretical flow rate of large circulation) & T 11 Exceeding the inlet limit temperature &0<|T 11 -T 12|; This indicates that there is flow in the front motor branch, but since the resistance of the small cycle is greater than that of the large cycle, L 1实 Lower than theoretical flow rate.

[0076] 0 <L 2实 <L 2理 (Theoretical flow rate of large cycle) & T21 exceeds the inlet limit temperature & 0 < | T 21 -T 22 |; This indicates that there is flow in the rear motor branch, but since the resistance of the small cycle is greater than that of the large cycle, L 2实 Lower than theoretical flow rate.

[0077] T 01 < <T 02 &T 02 ≈T 11 ≈T 22 , it means that the radiator is not dissipating heat at all, and T02 rises due to temperature radiation.

[0078] The cause of the fault corresponding to the above fault manifestation 3 is: the circulation of the thermal management system is actually in a small circulation loop, the multi-way valve does not move, or the multi-way valve does not move properly. Figure 6 As shown, the multi-way valve is not activated and the thermal management system is actually in a small cycle, resulting in no coolant passing through the radiator for heat dissipation.

[0079] For example, when the front motor and the rear motor are driven together, the fault manifestation 4 is:

[0080] 0 <L 1实 <L 2理 (Theoretical flow rate of large circulation) & T 11 Exceeding the inlet limit temperature &0<|T 11 -T 12 |; This indicates that there is flow in the front motor branch, but since the resistance of the small cycle is greater than that of the large cycle, L 1实 Lower than theoretical flow rate.

[0081] 0 <L 2实 <L 2理 (Theoretical flow rate of large cycle) & T21 exceeds the inlet limit temperature & 0 < | T 21 -T 22 |; This indicates that there is flow in the rear motor branch, but since the resistance of the small cycle is greater than that of the large cycle, L 2实 Lower than theoretical flow rate.

[0082] T 01 >T 02 &,|T 01 -T 02 |>The corresponding threshold value set in advance indicates that the coolant flow through the radiator is small, resulting in a large temperature difference between the inlet and outlet of the radiator.

[0083] T 02 <T 11 ≈T 21 , indicating that the water flowing through the radiator is mixed with hot water, causing the water temperature to rise significantly.

[0084] The cause of the fault corresponding to the above fault manifestation 4 is: the water valve is not in place, and is actually between the small and large cycles (that is, the small cycle is not completely closed and the large cycle is not completely opened), resulting in only part of the coolant flowing through the radiator for heat dissipation, and the radiator's heat dissipation capacity is not fully utilized. The specific manifestations are as follows: Figure 7 shown.

[0085] In some examples, the current working mode of the thermal management system is a single motor cooling-large circulation mode as an example, such as Figure 4 As shown, at this time, fault manifestation 5 is:

[0086] L 1实 =0&T 11 ≈T 12 ; There is no flow in the motor branch in front of the surface.

[0087] L 2实 =0&T 21 ≈T 22 ; There is no flow in the motor branch behind the surface.

[0088] At this time, since the front and rear motors have abnormally high temperatures at the same time, it means that there is no flow in the entire cooling circuit of the thermal management system. The fault causes at this time include: a. The water pump 1 is not actually working (the possibility of fault is high); b. The multi-way valve body 1-2 passage is blocked (the possibility of fault is high); c. The radiator is blocked (because the radiator has a multi-channel water channel structure inside, the possibility of complete blockage is low); d. There is a blockage in the main pipeline (the possibility of fault is low); f. The two branches of the front and rear motors are blocked at the same time (the possibility of fault is extremely low).

[0089] It can be understood that the above-mentioned correspondence between fault manifestations and fault causes is only for illustration, and does not include all fault manifestations, nor all fault causes corresponding to each fault manifestation. Relevant personnel can flexibly set the correspondence between fault manifestations and fault causes according to actual needs.

[0090] After obtaining the above preset correspondence relationship between the fault manifestation and the fault cause, this example queries the preset correspondence relationship between the fault manifestation and the fault cause through the target fault manifestation to obtain the initial fault cause corresponding to the target fault manifestation.

[0091] It can be understood that if the number of the determined initial fault cause is one, the initial fault cause can be directly used as the fault diagnosis result and output.

[0092] For example, when the working mode of the thermal management system is single motor drive, the target fault is manifested as:

[0093] T 11 Above a preset temperature threshold.

[0094] L 1实 <L 1理 And |L 1实 -L 1理 |>Preset L 1实 and L 1理 The corresponding threshold value indicates that the flow rate of the front motor branch is significantly low, and the water temperature passing through the front motor exceeds the standard due to the reduced flow rate.

[0095] L 2实 >L 2理 And |L 2实 -L 2理 |>Preset L 2实 and L 2理 The corresponding threshold value indicates that the flow rate of the rear motor branch increases, which may be caused by the blockage of the front motor branch.

[0096] 0 <L 1实 +L 2实 <L 1理 +L 2理 , it indicates that a branch may be blocked. Since one of the branches is blocked, the resistance of the entire system increases, so the main flow is less than the theoretical flow. However, since another branch is not blocked, the actual flow exists and is greater than 0.

[0097] The initial fault cause obtained is: the front motor branch is blocked due to pipeline distortion or impurities.

[0098] Since the number of initial fault causes obtained is 1, the initial fault cause can be directly output as the fault diagnosis result.

[0099] According to the technical solution provided in the embodiment of the present application, the correspondence between the preset fault manifestation and the fault cause is obtained, and the correspondence between the preset fault manifestation and the fault cause is queried through the target fault manifestation to obtain the initial fault cause corresponding to the target fault manifestation; if the number of determined initial fault causes is one, the determined initial fault cause is used as the fault diagnosis result, thereby achieving accurate determination of the fault diagnosis result corresponding to the fault manifestation.

[0100] In some embodiments, Figure 8 As shown, determining the fault diagnosis result of the thermal management system according to the target fault manifestation also includes:

[0101] S801: If the number of determined initial fault causes is multiple, obtain at least one verification working mode, where the verification working mode is used to verify the at least one initial fault cause;

[0102] S802: operate the thermal management system according to the verification working mode, verify at least one initial fault cause, obtain a target fault cause, and use the target fault cause as a fault diagnosis result.

[0103] Specifically, if there are multiple initial fault causes, it is necessary to determine the accuracy of each initial fault cause. In this example, at least one verification working mode is obtained, and at least one initial fault cause is verified through the working mode. If the verification result indicates that the initial fault cause really exists, or the initial fault cause cannot be verified, the initial fault cause is used as the target fault cause; if the verification result indicates that the initial fault cause does not exist, the initial fault cause will not be used as the target fault cause.

[0104] For example, when the thermal management system is in working mode A, there may be three fault causes through the thermal management model fault diagnosis. The faulty parts corresponding to each fault cause are a, b, and c respectively. Then this example obtains multiple verification modes such as B, C...N.

[0105] If the thermal management system is in working mode B, parts a and c are involved in the work. By judging whether the thermal management system is normal in working mode B, whether parts a, c or b are normal can be judged.

[0106] If the thermal management system is in working mode C, parts a and b are involved in the work. By judging whether the thermal management system is normal in working mode C, whether parts a, b or c are normal can be judged.

[0107] By executing multiple working modes respectively through B, C...N, different thermal management components are involved in the work (including different working states of the same part, mainly referring to different passages of the valve body participating in the circulation and whether the water pump is running), and they are iterated with each other to determine the faulty thermal management component and the target fault cause.

[0108] In order to better understand the above method, this embodiment provides a more specific example for illustration.

[0109] Taking the current working mode of the thermal management system as the single motor cooling mode as an example, the fault manifestation 5 is:

[0110] L 1实 =0&T 11 ≈T 12 ; There is no flow in the motor branch in front of the surface.

[0111] L 2实 =0&T21 ≈T 22 ; There is no flow in the motor branch behind the surface.

[0112] At this time, since the front and rear motors have abnormally high temperatures at the same time, it means that there is no flow in the entire cooling circuit of the thermal management system. The fault causes at this time include: a. The water pump 1 is not actually working (the possibility of fault is high); b. The multi-way valve body 1-2 passage is blocked (the possibility of fault is high); c. The radiator is blocked (because the radiator has a multi-channel water channel structure inside, the possibility of complete blockage is low); d. There is a blockage in the main pipeline (the possibility of fault is low); f. The two branches of the front and rear motors are blocked at the same time (the possibility of fault is extremely low).

[0113] At this time, the single motor cooling-small circulation mode is obtained, and the cooling circuit of the thermal management system is switched to the single motor cooling-small circulation mode, such as Figure 6 shown.

[0114] If at this time L 1实 =L 1理 (Small cycle theoretical flow) & T 11 >T 12 , it indicates that the front motor branch circulation is normal after switching to the small circulation.

[0115] L 2实 =L 2理 (Small cycle theoretical flow) & T 21 >T 22 ; It indicates that the rear motor branch circulation is normal after switching to the small circulation.

[0116] According to the above analysis, the two branches of the front and rear motors are not blocked, the main pipeline is not blocked, and the water pump 1 is actually working. The possible target fault causes are: b. The multi-way valve body 1-2 passage is blocked; c. The radiator is blocked.

[0117] In some examples, the present example can also switch the working mode of the thermal management system to the motor waste heat utilization mode. The cooling circuit corresponding to the motor waste heat utilization mode is as follows: Fig. 9 shown.

[0118] At this time, water pump 2 does not run. If: T 01 >T 02 , indicating that the water circulation in the circuit begins to flow after adjustment, and the heat dissipation function of the radiator begins to play a role;

[0119] L 1实 =L 1理 (Flow rate of pump 1 operating independently), L 2实 =L 2理 (Flow rate of water pump 1 running independently), indicating that the circulation is normal at this time.

[0120] In summary, it means that the radiator blockage abnormality does not exist, so the target fault cause is determined to be: Fault b multi-way valve body 1-2 channel is blocked.

[0121] In some examples, if there is still no change after the working mode of the thermal management system is switched to the waste heat utilization mode, then the water pump 2 is operated, and if:

[0122] T 01 >T 02 , indicating that the water circulation in the cooling circuit of the adjusted thermal management system begins to flow, and the heat dissipation function of the radiator begins to play a role;

[0123] L 1实 =L 1理 (Flow rate of pump 2 running independently), L 2实 =L 2理 (Flow rate of pump 2 running independently), indicating that the circulation is normal at this time.

[0124] In summary, it means that the radiator blockage abnormality does not exist, so the target fault cause is determined to be: Fault b multi-way valve body 1-2 channel is blocked.

[0125] In some examples, if the working mode of the thermal management system is switched to the waste heat utilization mode and there is no obvious change after the water pump 2 is operated at the same time, then the target fault cause is d, the main road is blocked or f, the front and rear motor branches are blocked at the same time; the target fault causes d and f are subsequently output as diagnostic results.

[0126] In addition, in order to further speed up the troubleshooting of relevant personnel, this example can also output the target fault cause f, the possibility of two circuits being blocked at the same time is extremely low, and the target fault cause d, the possibility of the main pipeline being blocked is high, so that relevant personnel can first eliminate the target fault cause with a high fault possibility.

[0127] According to the technical solution provided by the embodiment of the present application, if the number of determined initial fault causes is multiple, at least one verification working mode is obtained, and the verification working mode is used to verify at least one initial fault cause; the thermal management system is operated according to the verification working mode, at least one initial fault cause is verified, and the target fault cause is obtained, and the target fault cause is used as the fault diagnosis result, wherein, by switching the working mode of the thermal management system, the initial fault cause is verified and checked, so that the determined target fault cause narrows the investigation scope, improves the accuracy of the fault diagnosis result, and thus improves the fault diagnosis efficiency of the thermal management system. Among them, the fault diagnosis method of the thermal management system provided in this example first obtains the corresponding relationship between the fault manifestation and the fault cause through simulation and calibration and stores it. Then use the inlet and outlet temperature sensors of the thermal management device or the layout temperature sensors to calculate the inlet and outlet temperature difference, collect the working status (current and voltage) of the cooled object through the vehicle communication network, calculate the heat generation of each working device according to the efficiency map of each device, and calculate the actual flow of the coolant in the thermal cooling system in real time according to the heat generation and temperature difference. When the cooled object has a temperature exceeding the standard fault, compare the calculated actual flow with the pre-set theoretical flow, and at the same time, the target fault performance of the thermal management system in the current working mode to determine the fault diagnosis result; when there are multiple initial fault causes, this example controls the thermal management system to check the working mode changes, which is based on connecting several circuits independently or in series and parallel through multi-way valves or combination valves to form multiple working modes. In each mode, there are intersections and differences in the components involved in the work. The mutual iteration of different sets is used to determine the cause of the target fault or narrow the scope.

[0128] In some embodiments, Fig.10 As shown, the actual flow of the cooling circuit of the thermal management system in the current working mode is obtained, including:

[0129] S1001, obtaining a drive motor of the thermal management system in a current working mode, and determining an inlet temperature and an outlet temperature of a drive coolant of the drive motor;

[0130] S1002. Calculate the coolant temperature difference according to the inlet temperature and the outlet temperature, and calculate the actual flow rate according to the coolant temperature difference and the calorific value of the cooled object.

[0131] Specifically, through the vehicle network, the inlet temperature Tin and outlet temperature Tout of each device are collected in real time, and the temperature difference △T=Tout-Tin is calculated. According to Q=C*M*△T, the real-time flow rate is calculated, where C is the specific heat capacity, M is the mass flow rate of the coolant per unit time, and Q is the calorific value.

[0132] For example, taking the drive motor including the front motor as an example, the inlet temperature T corresponding to the front motor is obtained. 11and outlet temperature T 12 , then calculate the temperature difference △T=T 11 -T 12 .

[0133] Finally, the actual flow rate can be determined based on the corresponding relationship between the above-mentioned calorific value, temperature difference △T and the actual flow rate.

[0134] It can be understood that if in some examples, the drive motor includes multiple motors, the actual flow corresponding to each motor is obtained separately, and then the actual flow corresponding to each motor is added together to obtain the actual flow corresponding to the cooling circuit of the thermal management system.

[0135] According to the technical solution provided in the embodiment of the present application, the drive motor of the thermal management system in the current working mode is obtained, and the inlet temperature and outlet temperature of the coolant driven by the drive motor are determined; the coolant temperature difference is calculated based on the inlet temperature and the outlet temperature, and the actual flow rate is calculated based on the coolant temperature difference and the heat generated by the cooled object, thereby achieving accurate determination.

[0136] In some embodiments, Fig.11 As shown, the actual flow rate is calculated based on the coolant temperature difference and the heat generated by the object being cooled, including:

[0137] S1101, obtaining the specific heat capacity and fluid density of the coolant, and obtaining the product of the specific heat capacity, the fluid density and the coolant temperature difference;

[0138] S1102. The ratio of the calorific value to the product of the specific heat capacity, the fluid density and the coolant temperature difference is taken as the actual flow rate.

[0139] It can be understood that the calorific value formula is: Q = C*M*△T, where Q is the calorific value, C is the specific heat capacity, and M is the mass flow rate of the coolant per unit time.

[0140] M is the mass flow rate of the coolant per unit time, which can be calculated by M=ρ*L, where ρ is the density of the coolant.

[0141] Substituting the mass flow rate M into the calorific value formula, we can obtain Q = C*(ρ*Lreal)*△T, then Lreal = Q / C*ρ*△T.

[0142] In summary, this example obtains the specific heat capacity and fluid density of the coolant, and obtains the product of the specific heat capacity, fluid density and coolant temperature difference; then obtains the ratio of the calorific value to the product of the specific heat capacity, fluid density and coolant temperature difference to obtain the actual flow rate.

[0143] It can be understood that this example does not limit the material of the coolant. Relevant technicians can flexibly set the material of the coolant. Relevant personnel can obtain parameters such as the fluid density and specific heat capacity of the coolant through the material of the coolant. In some examples, water is used as the coolant.

[0144] According to the technical solution provided in the embodiment of the present application, the specific heat capacity and fluid density of the coolant are obtained, and the product of the specific heat capacity, fluid density and the coolant temperature difference is obtained; the ratio of the calorific value to the product of the specific heat capacity, fluid density and the coolant temperature difference is used as the actual flow rate, thereby achieving accurate determination of the actual flow rate based on parameters such as the coolant fluid density, coolant temperature difference, and specific heat capacity.

[0145] In some embodiments, Fig.12 As shown, after determining the fault diagnosis result of the thermal management system according to the target fault manifestation, the method further includes:

[0146] S1201, determining the safety impact value of the fault diagnosis result on the vehicle;

[0147] S1202: If the safety impact value of the fault diagnosis result on the vehicle exceeds a set safety impact threshold, a parking warning is issued.

[0148] Specifically, different fault diagnosis results have different impacts on the safety of the vehicle. For example, the fault diagnosis result indicates that there is a minor fault in the front motor branch and the flow rate is small, but the rear motor branch is not faulty. At this time, the thermal management system can still cool down the vehicle's components. Therefore, the fault diagnosis result has a small impact on the safety of the vehicle and will not exceed the pre-set safety impact threshold.

[0149] If the fault diagnosis results indicate that the front motor branch is blocked and the rear motor branch is blocked, the thermal management system will be unable to cool the vehicle's components, causing the vehicle's engine, braking system, etc. to overheat, posing a major safety hazard. At this time, the fault diagnosis results have a greater impact on the vehicle's safety and will exceed the set safety impact threshold.

[0150] It can be understood that the safety impact value and safety impact threshold corresponding to the specific fault diagnosis result can be flexibly set by relevant personnel according to actual needs.

[0151] In some examples, if the safety impact value of the fault diagnosis result on the vehicle exceeds the set safety impact threshold, the vehicle will issue a stop warning due to the large safety hazard of the vehicle, so that relevant personnel can be informed of the safety hazard of the vehicle in a timely manner, thereby improving driving safety.

[0152] According to the technical solution provided in the embodiment of the present application, the safety impact value of the fault diagnosis result on the vehicle is determined; if the safety impact value of the fault diagnosis result on the vehicle exceeds the set safety impact threshold, a stop warning is issued. Since the vehicle has a large safety hazard, the vehicle issues a stop warning, so that relevant personnel can be informed of the safety hazards of the vehicle in a timely manner, thereby improving driving safety.

[0153] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0154] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0155] This embodiment also provides a thermal management system fault diagnosis device, such as Fig.13 As shown, the device comprises:

[0156] The acquisition module 1301 is used to acquire the heat value of the object to be cooled in the vehicle during the operation of the thermal management system of the vehicle; if the heat value of the object to be cooled exceeds the preset heat value, the actual flow rate of the cooling circuit of the thermal management system in the current working mode is acquired;

[0157] A comparison module 1302 is used to compare the actual flow rate of the cooling circuit in the current working mode with the preset theoretical flow rate. If the comparison result of the actual flow rate of the cooling circuit in the current working mode and the theoretical flow rate indicates that there is a fault in the thermal management system, then a target fault manifestation of the thermal management system in the current working mode is obtained;

[0158] The diagnosis module 1303 is used to determine the fault diagnosis result of the thermal management system according to the target fault manifestation.

[0159] In some examples, obtaining a target fault manifestation of the thermal management system in the current operating mode includes: obtaining a target thermal management device of the thermal management system in the current operating mode; obtaining a cooling temperature corresponding to each target thermal management device, and determining the target fault manifestation based on the cooling temperature and the actual flow of the cooling circuit in the current operating mode.

[0160] In some examples, a fault diagnosis result of a thermal management system is determined based on a target fault manifestation, including: obtaining a correspondence between a preset fault manifestation and a fault cause, and querying the correspondence between the preset fault manifestation and the fault cause through the target fault manifestation to obtain an initial fault cause corresponding to the target fault manifestation; if the number of determined initial fault causes is one, the determined initial fault cause is used as the fault diagnosis result.

[0161] In some examples, determining a fault diagnosis result of a thermal management system based on a target fault manifestation also includes: if a plurality of initial fault causes are determined, obtaining at least one verification working mode, the verification working mode being used to verify at least one initial fault cause; operating the thermal management system according to the verification working mode, verifying at least one initial fault cause, obtaining a target fault cause, and using the target fault cause as the fault diagnosis result.

[0162] In some examples, obtaining the actual flow of the cooling circuit of the thermal management system in the current operating mode includes: obtaining the drive motor of the thermal management system in the current operating mode, and determining the inlet temperature and outlet temperature of the coolant driven by the drive motor; calculating the coolant temperature difference according to the inlet temperature and the outlet temperature, and calculating the actual flow according to the coolant temperature difference and the heat generated by the cooled object.

[0163] In some examples, the actual flow rate is calculated based on the coolant temperature difference and the calorific value of the cooled object, including: obtaining the specific heat capacity and fluid density of the coolant, and obtaining the product of the specific heat capacity, fluid density and the coolant temperature difference; and taking the ratio of the calorific value to the product of the specific heat capacity, fluid density and the coolant temperature difference as the actual flow rate.

[0164] In some examples, after determining the fault diagnosis result of the thermal management system according to the target fault manifestation, the method also includes: determining the safety impact value of the fault diagnosis result on the vehicle; if the safety impact value of the fault diagnosis result on the vehicle exceeds a set safety impact threshold, a parking warning is issued.

[0165] According to the technical solution provided in the embodiment of the present application, during the operation of the thermal management system of the vehicle, the heat value of the cooled object in the vehicle is obtained; if the heat value of the cooled object exceeds the preset heat value, the actual flow rate of the cooling circuit of the thermal management system in the current working mode is obtained; the actual flow rate of the cooling circuit in the current working mode is compared with the preset theoretical flow rate, and if the comparison result of the actual flow rate of the cooling circuit and the theoretical flow rate in the current working mode indicates that there is a fault in the thermal management system, the target fault manifestation of the thermal management system in the current working mode is obtained; the fault diagnosis result of the thermal management system is determined according to the target fault manifestation, wherein the heat value of the cooled device and the actual flow rate of the thermal management system are used to accurately determine whether there is a fault in the thermal management system in the current operating mode, and subsequently this example obtains the target fault manifestation of the thermal management system to determine the fault diagnosis result, so that the fault diagnosis is more targeted, and the root cause of the fault can be more efficiently investigated, reducing the possibility of misjudgment and missed judgment; based on the combination of heat value, actual flow rate and target fault manifestation, this method can accurately determine the fault condition of the thermal management system in the current operating mode, greatly improving the accuracy and speed of fault diagnosis. This method ensures the reliability of the thermal management system under complex working conditions, provides strong protection for the safety and performance of the vehicle, and avoids the problems of long fault diagnosis time and poor fault diagnosis effect of the thermal management system in related technologies.

[0166] Fig.14 Schematic diagram of an electronic device 14 provided in an embodiment of the present application. Fig.14 As shown, the electronic device 14 of this embodiment includes: a processor 1401, a memory 1402, and a computer program 1403 stored in the memory 1402 and executable on the processor 1401. When the processor 1401 executes the computer program 1403, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor 1401 executes the computer program 1403, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0167] The electronic device 14 may be a desktop computer, a notebook, a PDA, a cloud server, or other electronic device. The electronic device 14 may include, but is not limited to, a processor 1401 and a memory 1402. Those skilled in the art will appreciate that Fig.14 The electronic device 14 is merely an example and does not limit the electronic device 14 , and may include more or less components than those shown in the figure, or different components.

[0168] The processor 1401 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0169] The memory 1402 may be an internal storage unit of the electronic device 14, for example, a hard disk or memory of the electronic device 14. The memory 1402 may also be an external storage device of the electronic device 14, for example, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device 14. The memory 1402 may also include both an internal storage unit of the electronic device 14 and an external storage device. The memory 1402 is used to store computer programs and other programs and data required by the electronic device.

[0170] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0171] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. The computer program may include computer program code, and the computer program code may be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of regional requirements and patent practice. For example, in some areas, according to regional requirements and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0172] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A thermal management system fault diagnosis method, characterized in that: The method comprises: During operation of the thermal management system of the vehicle, obtaining the heat generated by a cooled object in the vehicle; If the calorific value of the cooled object exceeds the preset calorific value, obtaining the actual flow rate of the cooling circuit of the thermal management system in the current working mode; Compare the actual flow of the cooling circuit under the current working mode with the preset theoretical flow, and if the comparison result of the actual flow of the cooling circuit under the current working mode and the theoretical flow indicates that there is a fault in the thermal management system, obtain the target fault performance of the thermal management system under the current working mode; A fault diagnosis result of the thermal management system is determined according to the target fault manifestation.

2. The method according to claim 1, characterized in that Obtaining a target fault manifestation of the thermal management system in the current working mode includes: Acquire a target thermal management device of the thermal management system in the current working mode; A cooling temperature corresponding to each of the target thermal management components is obtained, and the target fault manifestation is determined according to the cooling temperature and an actual flow rate of a cooling circuit in the current working mode.

3. The method according to claim 1, characterized in that Determining a fault diagnosis result of the thermal management system according to the target fault manifestation includes: Obtaining a correspondence between a preset fault manifestation and a fault cause, and querying the correspondence between a preset fault manifestation and a fault cause through the target fault manifestation to obtain an initial fault cause corresponding to the target fault manifestation; If the number of the determined initial fault causes is one, the determined initial fault cause is used as the fault diagnosis result.

4. The method according to claim 3, characterized in that Determining a fault diagnosis result of the thermal management system according to the target fault manifestation further includes: If the number of the determined initial fault causes is multiple, obtaining at least one verification working mode, the verification working mode being used to verify at least one of the initial fault causes; The thermal management system is operated according to the verification working mode, at least one of the initial fault causes is verified, a target fault cause is obtained, and the target fault cause is used as the fault diagnosis result.

5. The method according to claim 1, characterized in that Obtaining the actual flow of the cooling circuit of the thermal management system in the current working mode includes: Acquire the drive motor of the thermal management system in the current working mode, and determine the inlet temperature and outlet temperature of the drive coolant of the drive motor; The coolant temperature difference is calculated according to the inlet temperature and the outlet temperature, and the actual flow rate is calculated according to the coolant temperature difference and the calorific value of the cooled object.

6. The method according to claim 5, characterized in that Calculating the actual flow rate according to the coolant temperature difference and the calorific value of the cooled object includes: Obtaining the specific heat capacity and fluid density of the coolant, and obtaining the product of the specific heat capacity, the fluid density and the coolant temperature difference; The ratio of the calorific value to the product of the specific heat capacity, the fluid density and the coolant temperature difference is taken as the actual flow rate.

7. The method according to claim 1, characterized in that After determining the fault diagnosis result of the thermal management system according to the target fault manifestation, the method further includes: Determining the safety impact value of the fault diagnosis result on the vehicle; If the safety impact value of the fault diagnosis result on the vehicle exceeds a set safety impact threshold, a parking warning is issued.

8. A thermal management system fault diagnosis device, characterized in that: The device comprises: An acquisition module is used to acquire the heat value of a cooled object in the vehicle during operation of the thermal management system of the vehicle; if the heat value of the cooled object exceeds a preset heat value, an actual flow rate of a cooling circuit of the thermal management system in a current working mode is acquired; A comparison module, configured to compare an actual flow rate of the cooling circuit in the current working mode with a preset theoretical flow rate, and if the comparison result of the actual flow rate of the cooling circuit in the current working mode with the theoretical flow rate indicates that the thermal management system has a fault, then obtain a target fault manifestation of the thermal management system in the current working mode; A diagnosis module is used to determine a fault diagnosis result of the thermal management system according to the target fault manifestation.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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