Method and device for monitoring a failure of an electrically driven cooling circuit

Abstract

The embodiment of the application provides a kind of electric drive cooling circuit fault monitoring method and device, the method comprises: in the process of vehicle driving, the real-time temperature of cooling liquid under power module is estimated in real time;Then the temperature of cooling liquid of electric drive cooling circuit is detected by temperature sensor;Then according to cooling liquid temperature and real-time temperature, whether electric drive cooling circuit exists abnormality is judged;If yes, control vehicle enters the state of lameness, and output the prompt information that electric drive cooling circuit exists abnormality, can monitor power module temperature in real time, avoid that temperature is too high and can lead to power module overheating damage, it is favorable to improve vehicle driving safety.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and more specifically, to a method and device for monitoring faults in an electric drive cooling circuit. Background Technology

[0002] Currently, new energy motor controllers use water cooling. The coolant flows under the action of the on-board electronic water pump (EWP). If the water pump is blocked or the coolant leaks, the motor control is not cooled. During driving, the power module accumulates heat, and the excessive temperature will cause the power module to overheat and be damaged. Summary of the Invention

[0003] The purpose of this application is to provide a method and device for monitoring faults in an electric drive cooling circuit, which can monitor the temperature of the power module in real time, avoid overheating and damage to the power module due to excessive temperature, and improve vehicle driving safety.

[0004] The first aspect of this application provides a method for monitoring faults in an electric drive cooling circuit, including:

[0005] During vehicle operation, the real-time temperature of the coolant under the power module is estimated.

[0006] The temperature of the coolant in the electric drive cooling circuit is detected by a temperature sensor;

[0007] Based on the coolant temperature and the real-time temperature, determine whether there is an abnormality in the electric drive cooling circuit;

[0008] If so, the vehicle is controlled to enter limp mode, and a prompt message indicating that there is an abnormality in the electric drive cooling circuit is output.

[0009] In the above implementation process, during vehicle operation, the real-time temperature of the coolant under the power module is estimated; then, the coolant temperature of the electric drive cooling circuit is detected by a temperature sensor; next, based on the coolant temperature and the real-time temperature, it is determined whether there is an abnormality in the electric drive cooling circuit; if so, the vehicle is controlled to enter a limp state and an abnormality warning message for the electric drive cooling circuit is output. This allows for real-time monitoring of the power module temperature, preventing overheating and damage to the power module, and improving vehicle driving safety.

[0010] Further, based on the coolant temperature and the real-time temperature, it is determined whether there is an abnormality in the electric drive cooling circuit, including:

[0011] Calculate the current temperature difference between the coolant temperature and the real-time temperature;

[0012] Determine whether the current temperature difference is greater than a pre-stored temperature difference threshold;

[0013] If so, it is determined that there is an abnormality in the electric drive cooling circuit, and the control of the vehicle to enter the limp state is executed.

[0014] If not, then it is determined that there is no abnormality in the electric drive cooling circuit.

[0015] Furthermore, before calculating the current temperature difference between the coolant temperature and the real-time temperature, the method further includes:

[0016] The test temperature difference between the coolant temperature of the power module and the circuit water temperature under full load conditions was measured by bench test.

[0017] Based on the preset temperature difference value and the test temperature difference value, the temperature difference threshold is determined and stored.

[0018] Furthermore, controlling the vehicle to enter a limp state includes:

[0019] The vehicle is controlled to reduce the current output of the motor controller to enter limp mode.

[0020] A second aspect of this application provides an electric drive cooling circuit fault monitoring device, the electric drive cooling circuit fault monitoring device comprising:

[0021] The estimation unit is used to estimate the real-time temperature of the coolant under the power module during vehicle operation.

[0022] The detection unit is used to detect the coolant temperature of the electric drive cooling circuit through a temperature sensor;

[0023] The judgment unit is used to determine whether there is an abnormality in the electric drive cooling circuit based on the coolant temperature and the real-time temperature.

[0024] The control unit is used to control the vehicle to enter a limp state when it is determined that there is an abnormality in the electric drive cooling circuit.

[0025] The output unit is used to output a prompt message indicating that there is an abnormality in the electric drive cooling circuit.

[0026] In the above implementation process, the estimation unit estimates the real-time temperature of the coolant under the power module during vehicle operation; the detection unit then detects the coolant temperature of the electric drive cooling circuit through a temperature sensor; next, the judgment unit determines whether there is an abnormality in the electric drive cooling circuit based on the coolant temperature and the real-time temperature; if so, the control unit controls the vehicle to enter a limp state, and finally the output unit outputs a prompt message indicating that there is an abnormality in the electric drive cooling circuit. This real-time monitoring of the power module temperature can prevent overheating and damage to the power module, thus improving vehicle driving safety.

[0027] Furthermore, the determination unit includes:

[0028] A calculation subunit is used to calculate the current temperature difference between the coolant temperature and the real-time temperature;

[0029] The judgment subunit is used to determine whether the current temperature difference is greater than a pre-stored temperature difference threshold.

[0030] The determination subunit is used to determine that there is an abnormality in the electric drive cooling circuit when the current temperature difference is greater than the temperature difference threshold, and to determine that there is no abnormality in the electric drive cooling circuit when the current temperature difference is not greater than the temperature difference threshold.

[0031] Furthermore, the determination unit also includes:

[0032] The test subunit is used to test the temperature difference between the coolant temperature and the loop water temperature of the power module under full load conditions through bench testing before calculating the current temperature difference between the coolant temperature and the real-time temperature.

[0033] The determining subunit is further configured to determine and store a temperature difference threshold based on a preset temperature difference value and the test temperature difference value.

[0034] Furthermore, the control unit is specifically used to control the vehicle to reduce the current output of the motor controller to enter a limp state when it is determined that there is an abnormality in the electric drive cooling circuit.

[0035] A third aspect of this application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to cause the electronic device to perform the electric drive cooling circuit fault monitoring method described in any one of the first aspects of this application.

[0036] A fourth aspect of this application provides a computer-readable storage medium storing computer program instructions, which, when read and executed by a processor, perform the electric drive cooling circuit fault monitoring method described in any one of the first aspects of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1A flowchart illustrating a fault monitoring method for an electric drive cooling circuit provided in this application embodiment;

[0039] Figure 2 This is a schematic diagram of the structure of an electric drive cooling circuit fault monitoring device provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of an electric drive cooling circuit provided in an embodiment of this application.

[0041] Attached diagram descriptions: M - Vehicle drive motor; EOP - Oil pump; EWP - On-board electronic water pump; DCU - Electric drive control unit; IPS - On-board charger. Detailed Implementation

[0042] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0043] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Example 1

[0045] Please refer to Figure 1 , Figure 1 This application provides a flowchart illustrating a method for monitoring faults in an electric drive cooling circuit. This method is applicable to scenarios where power modules require cooling, and includes:

[0046] S101. During vehicle operation, estimate the real-time temperature of the coolant under the power module.

[0047] S102. The temperature of the coolant in the electric drive cooling circuit is detected by a temperature sensor.

[0048] In this embodiment, the real-time temperature T1 of the coolant under the power module is estimated in real time during driving, and the coolant temperature T2 detected by the coolant temperature sensor in the cooling circuit is received by the VCU (Vehicle Control Unit) via CAN message.

[0049] In this embodiment of the application, the power module can specifically be an IGBT (Insulated Gate Bipolar Transistor), which is a composite fully controllable voltage-driven power semiconductor device composed of a BJT (Bipolar Junction Transistor) and a MOS (Insulated Gate Field Effect Transistor).

[0050] In this embodiment of the application, a CAN message refers to a hexadecimal message received by the electronic control unit and CAN card on the CAN line (internal CAN, vehicle CAN, charging CAN).

[0051] S103. Calculate the current temperature difference between the coolant temperature and the real-time temperature.

[0052] In this embodiment of the application, the formula for calculating the current temperature difference is:

[0053] Current temperature difference = Real-time temperature - Coolant temperature = T1 - T2.

[0054] As an optional implementation, the method further includes, before calculating the current temperature difference between the coolant temperature and the real-time temperature:

[0055] The test temperature difference between the coolant temperature of the power module and the circuit water temperature under full load conditions was measured by bench test.

[0056] Based on the preset temperature difference value and the test temperature difference value, determine the temperature difference threshold and store it.

[0057] In the above implementation, the temperature difference T0 between the coolant temperature and the circuit water temperature of the IGBT under full load conditions can be tested by bench test.

[0058] In the above implementation method, the formula for calculating the temperature difference threshold is:

[0059] Temperature difference threshold = Temperature difference value + Test temperature difference value;

[0060] The temperature difference value is preset, and can be 10, but this embodiment of the application does not limit it.

[0061] In the above implementation, when the temperature difference value = 10, the temperature difference threshold value = T0 + 10.

[0062] Following step S103, the following steps are also included:

[0063] S104. Determine whether the current temperature difference is greater than the pre-stored temperature difference threshold. If not, proceed to step S105; if yes, proceed to step S106.

[0064] In this embodiment, during normal driving, if the electric drive cooling circuit is working properly, the temperature difference between the coolant temperature under the IGBT controlled by the motor and the inlet temperature does not exceed the temperature difference threshold (which can be tested on a bench). Only when the cooling circuit malfunctions and heat accumulates continuously in the IGBT will the coolant temperature under the IGBT be much higher than the inlet temperature.

[0065] S105. Confirm that there is no abnormality in the electric drive cooling circuit and proceed with step S101.

[0066] S106. It was determined that there was an abnormality in the electric drive cooling circuit.

[0067] S107. Control the vehicle to reduce the current output of the motor controller to enter limp state.

[0068] In this embodiment of the application, during normal driving, the temperature of the coolant inlet is directly compared with the junction temperature of the IGBT. If the current temperature difference is less than the temperature difference threshold, it indicates that the cooling system is working normally. Otherwise, the vehicle enters a limp state, reducing the current output to prevent the IGBT in the motor controller from overheating and being damaged.

[0069] In this embodiment of the application, if the current temperature difference is greater than the temperature difference threshold, that is, the coolant temperature under the IGBT is abnormal (the temperature difference is too large compared to the inlet), the electric drive cooling circuit is determined to be abnormal, and the vehicle is controlled to enter limp mode.

[0070] S108, an error message indicating an abnormality in the output electric drive cooling circuit.

[0071] In this embodiment of the application, a prompt message indicating an abnormality in the electric drive cooling circuit can be output through the screen instrument.

[0072] In this embodiment, the execution subject of the method can be a computing device such as a vehicle controller, and no limitation is made in this embodiment.

[0073] In this embodiment, the method compares the estimated water temperature with the temperature sensor value of the cooling circuit through the DCU (electric drive control unit) to determine whether the water pump is operating normally. It identifies faults in the electric drive cooling system from the perspective of the motor controller, making the diagnosis more direct and effective, and can solve the problem of power system damage caused by cooling system water pump failure.

[0074] Please refer to the following: Figure 3 , Figure 3 This is a schematic diagram of an electric drive cooling circuit provided in an embodiment of this application. Figure 3 As shown, M represents the vehicle drive motor, EOP represents the oil pump, EWP represents the on-board electronic water pump, DCU represents the electric drive control unit, and IPS represents the on-board charger.

[0075] As can be seen, implementing the electric drive cooling circuit fault monitoring method described in this embodiment can monitor the power module temperature in real time, avoid overheating and damage to the power module due to excessive temperature, and improve vehicle driving safety.

[0076] Example 2

[0077] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a fault monitoring device for an electric drive cooling circuit provided in an embodiment of this application. Figure 2 As shown, the electric drive cooling circuit fault monitoring device includes:

[0078] The estimation unit 210 is used to estimate the real-time temperature of the coolant under the power module during vehicle operation.

[0079] The detection unit 220 is used to detect the coolant temperature of the electric drive cooling circuit through a temperature sensor;

[0080] The judgment unit 230 is used to determine whether there is an abnormality in the electric drive cooling circuit based on the coolant temperature and the real-time temperature.

[0081] The control unit 240 is used to control the vehicle to enter a limp state when it is determined that there is an abnormality in the electric drive cooling circuit.

[0082] Output unit 250 is used to output a prompt message indicating that there is an abnormality in the electric drive cooling circuit.

[0083] As an optional implementation, the determination unit 230 includes:

[0084] The calculation subunit 231 is used to calculate the current temperature difference between the coolant temperature and the real-time temperature;

[0085] Judgment subunit 232 is used to determine whether the current temperature difference is greater than the pre-stored temperature difference threshold.

[0086] Subunit 233 is used to determine that there is an abnormality in the electric drive cooling circuit when the current temperature difference is greater than the temperature difference threshold; and to determine that there is no abnormality in the electric drive cooling circuit when the current temperature difference is not greater than the temperature difference threshold.

[0087] As an optional implementation, the determination unit 230 further includes:

[0088] Test subunit 234 is used to test the temperature difference between the coolant temperature and the loop water temperature of the power module under full load conditions through bench testing before calculating the current temperature difference between the coolant temperature and the real-time temperature.

[0089] The determination subunit 233 is also used to determine and store the temperature difference threshold based on the preset temperature difference value and the test temperature difference value.

[0090] As an optional implementation, the control unit 240 is specifically used to control the vehicle to reduce the current output of the motor controller to enter a limp state when an abnormality is detected in the electric drive cooling circuit.

[0091] In this embodiment, the explanation of the electric drive cooling circuit fault monitoring device can be referred to the description in Embodiment 1, and will not be repeated here.

[0092] As can be seen, implementing the electric drive cooling circuit fault monitoring device described in this embodiment can monitor the power module temperature in real time, avoid overheating and damage to the power module due to excessive temperature, and improve vehicle driving safety.

[0093] This application provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the electric drive cooling circuit fault monitoring method in embodiment 1 of this application.

[0094] This application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the electric drive cooling circuit fault monitoring method in embodiment 1 of this application is performed.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0096] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0097] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0099] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0100] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for monitoring faults in an electric drive cooling circuit, characterized in that, include: During vehicle operation, the real-time temperature of the coolant under the power module is estimated. The temperature of the coolant at the inlet of the electric drive cooling circuit is detected by a temperature sensor. Based on the coolant temperature and the real-time temperature, determine whether there is an abnormality in the electric drive cooling circuit; If so, the vehicle is controlled to enter limp state, and a prompt message indicating that there is an abnormality in the electric drive cooling circuit is output. The determination of whether there is an abnormality in the electric drive cooling circuit based on the coolant temperature and the real-time temperature includes: Calculate the current temperature difference between the coolant temperature and the real-time temperature; Determine whether the current temperature difference is greater than a pre-stored temperature difference threshold; If so, it is determined that there is an abnormality in the electric drive cooling circuit, and the control of the vehicle to enter the limp state is executed. If not, then it is determined that there is no abnormality in the electric drive cooling circuit; The step of controlling the vehicle to enter a limp state includes: The vehicle is controlled to reduce the current output of the motor controller to enter limp mode.

2. The method for monitoring faults in an electric drive cooling circuit according to claim 1, characterized in that, Before calculating the current temperature difference between the coolant temperature and the real-time temperature, the method further includes: The test temperature difference between the coolant temperature of the power module and the circuit water temperature under full load conditions was measured by bench test. Based on the preset temperature difference value and the test temperature difference value, the temperature difference threshold is determined and stored.

3. A fault monitoring device for an electric drive cooling circuit, characterized in that, The electric drive cooling circuit fault monitoring device includes: The estimation unit is used to estimate the real-time temperature of the coolant under the power module during vehicle operation. The detection unit is used to detect the coolant temperature at the inlet of the electric drive cooling circuit via a temperature sensor. The judgment unit is used to determine whether there is an abnormality in the electric drive cooling circuit based on the coolant temperature and the real-time temperature. The control unit is used to control the vehicle to enter a limp state when it is determined that there is an abnormality in the electric drive cooling circuit. The output unit is used to output a prompt message indicating that there is an abnormality in the electric drive cooling circuit; The determination unit includes: A calculation subunit is used to calculate the current temperature difference between the coolant temperature and the real-time temperature; The judgment subunit is used to determine whether the current temperature difference is greater than a pre-stored temperature difference threshold. The determination subunit is used to determine that there is an abnormality in the electric drive cooling circuit when the current temperature difference is greater than the temperature difference threshold; and to determine that there is no abnormality in the electric drive cooling circuit when the current temperature difference is not greater than the temperature difference threshold. Specifically, the control unit is used to control the vehicle to reduce the current output of the motor controller in order to enter a limp state when it is determined that there is an abnormality in the electric drive cooling circuit.

4. The electric drive cooling circuit fault monitoring device according to claim 3, characterized in that, The judgment unit further includes: The test subunit is used to test the temperature difference between the coolant temperature and the loop water temperature of the power module under full load conditions through bench testing before calculating the current temperature difference between the coolant temperature and the real-time temperature. The determining subunit is further configured to determine and store a temperature difference threshold based on a preset temperature difference value and the test temperature difference value.

5. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the electric drive cooling circuit fault monitoring method according to any one of claims 1 to 2.

6. A readable storage medium, characterized in that, The readable storage medium stores computer program instructions, which are read and executed by a processor to perform the electric drive cooling circuit fault monitoring method according to any one of claims 1 to 2.

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