Vehicle water pump fault diagnosis method, device, computer equipment and storage medium

Abstract

The present application relates to a vehicle water pump fault diagnosis method, apparatus, computer equipment, and storage medium. The method comprises: collecting water pump speed information and obtaining a water pump fault prompt based on the speed information; collecting the engine coolant temperature and the rate of change of the coolant temperature within a first time period based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; determining whether a water pump stall fault has occurred based on the first and second comparison results to obtain a determination result; and controlling the range extender based on the determination result. This method can improve the accuracy of determining a water pump stall fault.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle water pump fault diagnosis method, device, computer equipment and storage medium. Background Art

[0002] A range extender generally refers to an electric vehicle component that can provide additional electrical energy, thereby increasing the mileage of an electric vehicle. Traditionally, a range extender refers to a combination of an engine and a generator. When the range extender is operating, the temperature of the range extender will gradually increase. The vehicle's water pump can be controlled accordingly based on the temperature of the range extender, allowing the range extender to operate within the optimal temperature range, thereby effectively reducing energy consumption and increasing the range extender's power generation efficiency. However, when the vehicle's water pump fails, the engine coolant in the range extender will not circulate, making it difficult to promptly remove the heat generated by the engine, which can easily cause engine damage. Therefore, it is necessary to promptly diagnose the water pump failure and take appropriate protective measures. Currently, the water pump stall failure is only diagnosed based on the water pump's speed, which is prone to misdiagnosis. Summary of the Invention

[0003] Based on this, a vehicle water pump fault diagnosis method, device, computer equipment and storage medium are provided to improve the problem of easy misjudgment of vehicle water pump jam fault in the prior art.

[0004] On the one hand, a vehicle water pump fault diagnosis method is provided, the method comprising: collecting water pump speed information, and obtaining a water pump fault prompt based on the speed information; collecting the coolant temperature and the rate of change of the coolant temperature within a first period of time of the engine based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; judging whether a water pump stall fault occurs based on the first comparison result and the second comparison result to obtain a judgment result; and controlling the range extender based on the judgment result.

[0005] In one embodiment, whether a water pump stall failure occurs is determined based on the first comparison result and the second comparison result, and a judgment result is obtained, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm.

[0006] In one embodiment, if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm, and the method further includes: obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump jam fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output.

[0007] In one embodiment, after obtaining a request to limit the water pump signal output, the water pump signal output is limited according to the request, and the water pump jam fault is cleared within a second time period, wherein the second time period is after the time period for limiting the water pump signal output, and further includes: if the water pump fault prompt is obtained again, then the water pump has a jam fault.

[0008] In one embodiment, the range extender is controlled based on the judgment result, including: if a water pump stalls, the range extender is protected, engine performance is reduced, and the vehicle is placed in an idle state.

[0009] In one embodiment, the temperature change rate threshold is determined based on engine speed information and load.

[0010] On the other hand, a vehicle water pump fault diagnosis device is provided, which includes: a fault prompt module, which is used to collect water pump speed information and obtain a water pump fault prompt based on the speed information; a temperature collection module, which is used to collect the coolant temperature and the rate of change of the coolant temperature within a first time period of the engine according to the fault prompt; a first comparison module, which is used to compare the coolant temperature with a temperature threshold to obtain a first comparison result; a second comparison module, which is used to compare the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; a result judgment module, which is used to judge whether the water pump has a stall fault based on the first comparison result and the second comparison result to obtain a judgment result; and a range extender protection module, which is used to control the range extender based on the judgment result.

[0011] On the other hand, a computer 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 following steps when executing the computer program: collecting speed information of a water pump, and obtaining a water pump fault prompt based on the speed information; collecting the coolant temperature and the rate of change of the coolant temperature within a first time period of the engine based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; judging whether a water pump stall fault occurs based on the first comparison result and the second comparison result to obtain a judgment result; and controlling the range extender based on the judgment result.

[0012] On the other hand, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented: collecting speed information of a water pump, and obtaining a fault prompt of the water pump based on the speed information; collecting the coolant temperature and the rate of change of the coolant temperature within a first time period of the engine based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; judging whether a water pump stall fault occurs based on the first comparison result and the second comparison result to obtain a judgment result; and controlling the range extender based on the judgment result.

[0013] The above-mentioned vehicle water pump fault diagnosis method, device, computer equipment and storage medium collect the speed information of the water pump and obtain the water pump fault prompt based on the speed information;

[0014] The coolant temperature and the rate of change of the coolant temperature within a first period of time of the engine are collected according to the fault prompt; the coolant temperature is compared with a temperature threshold to obtain a first comparison result; the rate of change of the coolant temperature is compared with a temperature change rate threshold to obtain a second comparison result; based on the first comparison result and the second comparison result, it is determined whether a water pump jam occurs to obtain a determination result; based on the determination result, the range extender is controlled to improve the accuracy of determining a vehicle water pump jam fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a flow chart of a vehicle water pump fault diagnosis method according to an embodiment;

[0016] Figure 2 is a structural block diagram of a vehicle water pump fault diagnosis device in one embodiment;

[0017] Figure 3 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0019] The vehicle water pump fault diagnosis method provided in this application can be applied to electric vehicles, wherein the electric vehicle at least includes a battery management system (Electronic Battery Sensor, referred to as EBS), a power battery pack management system (Battery Management System, referred to as BMS), a DC converter (DC / DC), a vehicle control unit (VCU), a central control panel (ICU), a motor controller (MCU), a body control module (BCM) and a telematics box (T-BOX), wherein each module device is connected via a CAN bus or hard wire. The settings of the various module devices on the electric vehicle and the specific connection methods therebetween are set with reference to the existing technology or according to the actual production needs of the manufacturer, and are not specifically limited here.

[0020] Among them, the Internet of Vehicles module is mainly used to realize the communication connection between the electric vehicle and the outside world. For example, the Internet of Vehicles module can communicate with the user terminal corresponding to the user (such as a mobile phone APP) or the server side corresponding to the after-sales personnel (such as a backend server), so that the user can read the status information of the electric vehicle through the mobile phone APP and the after-sales personnel can read the status or fault information of the electric vehicle through the backend server.

[0021] It should be noted that the above does not constitute a limitation on the electric vehicle. In other embodiments, the electric vehicle may include fewer or more components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0022] In one embodiment, Figure 2 As shown, a vehicle water pump fault diagnosis method is provided, comprising the following steps:

[0023] Step 101: collecting the rotational speed information of the water pump and obtaining a fault prompt of the water pump according to the rotational speed information;

[0024] Step 102, collecting the engine coolant temperature and the rate of change of the coolant temperature within a first period of time according to the fault prompt;

[0025] Step 103: Compare the coolant temperature with the temperature threshold to obtain a first comparison result;

[0026] Step 104, comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result;

[0027] Step 105, determining whether a water pump stall fault occurs based on the first comparison result and the second comparison result, and obtaining a determination result;

[0028] Step 106: Control the range extender based on the judgment result.

[0029] In step 101, it is exemplified that the speed information of the water pump is collected, and a fault prompt of the water pump is obtained based on the speed information. For example, an electric vehicle includes a vehicle controller and a water pump connected to the vehicle controller via a hard line. The vehicle controller outputs a pulse width modulation (PWM) control signal to the water pump via a hard line to control the working state of the water pump. Generally, the vehicle water pump has its own independent controller, and fault diagnosis is also completed independently by it, and fault information, such as a flag or code, is sent to the electronic control unit (ECU) for fault diagnosis. In some implementation processes, the fault prompt is used to prompt that the water pump has a stall fault. First, the speed information of the water pump is collected and compared with a preset speed. When the speed information is less than the preset speed, the water pump sends a fault prompt to the ECU.

[0030] In step 102, the engine coolant temperature and the rate of change of the coolant temperature are collected over a first period of time based on the fault indication. For example, the water pump, a key engine component, can fail to circulate the engine coolant and dissipate the heat generated by the engine, leading to engine overheating or even damage. Therefore, upon receiving a water pump stall fault, the ECU will take actions such as reducing the load, limiting the torque, or even shutting down the engine to protect the engine. However, implementing these measures can create a negative user experience, so it is necessary to confirm that the stall fault is genuine and accurate. Therefore, after the water pump itself performs a fault diagnosis, the ECU reconfirms the fault to ensure the accuracy of the stall fault. In some implementations, within a driving cycle (i.e., the process from vehicle power-up to power-off), after the water pump first issues a fault indication, to ensure that the fault indication is not a false alarm, the ECU determines whether the water pump is truly stalled based on the current change in the engine coolant temperature.

[0031] In steps 103 to 104, it is exemplarily explained that the coolant temperature is compared with the temperature threshold to obtain a first comparison result, and the rate of change of the coolant temperature is compared with the temperature change rate threshold to obtain a second comparison result. For example, the rate of change of the coolant temperature can be determined by the change in the coolant temperature within a unit time range, and the temperature change rate threshold can be determined by the engine speed and load.

[0032] In step 105, it is exemplarily explained that whether the water pump has a stall fault is determined based on the first comparison result and the second comparison result, and a judgment result is obtained. For example, when the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, it can be considered that the water pump fault prompt is a false alarm; when the rate of change of the coolant temperature is less than the temperature change rate threshold, it can be considered that the water pump has a stall fault, thereby triggering the range extender protection.

[0033] In step 106, it is exemplified that the range extender is controlled according to the judgment result. For example, when it is confirmed that the water pump is blocked, the protection of the range extender is triggered, which specifically includes sequentially executing operations such as reducing engine performance, returning the vehicle to idle state, and shutting down the vehicle.

[0034] In the above-mentioned vehicle water pump fault diagnosis method, the water pump fault prompt is obtained by collecting the water pump speed information, which triggers the collection of the engine coolant temperature and the coolant temperature change rate, so as to make a secondary judgment on the water pump jam fault based on the coolant temperature and the coolant temperature change, thereby improving the accuracy of the jam fault judgment.

[0035] As a specific implementation method of the above embodiment, whether the water pump has a stall fault is determined based on the first comparison result and the second comparison result, and a judgment result is obtained, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm.

[0036] As a specific implementation method of the above embodiment, if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm, it also includes: obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump jam fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output.

[0037] It should be noted that to further improve the accuracy of stall fault diagnosis, after the coolant temperature and the coolant temperature change rate determine that the fault prompt is a false alarm, the stall fault can be cleared and the stall fault diagnosis can be repeated. In some implementations, the ECU can send a 0 duty cycle request to limit the water pump signal output. After a second delay, the water pump's normal duty cycle control is restored. The second delay is obtained by default and can be set to 25 seconds. At the same time, during the second delay, the water pump controller clears the fault and re-diagnoses the stall fault. When the ECU receives relevant information about the second fault prompt within a driving cycle, it determines that the water pump has a stall fault and triggers protection for the range extender.

[0038] As a specific implementation method of the above embodiment, after obtaining a request to limit the water pump signal output, the water pump signal output is limited according to the request, and the water pump jam fault is cleared within a second time period, wherein the second time period is after the time period for limiting the water pump signal output, and also includes: if the water pump fault prompt is obtained again, the water pump has a jam fault.

[0039] As a specific implementation of the above embodiment, whether the water pump has a stall fault is determined based on the first comparison result and the second comparison result, and a judgment result is obtained, including: if the coolant temperature change rate is less than the temperature change rate threshold, the water pump has a stall fault.

[0040] As a specific implementation of the above embodiment, the range extender is controlled according to the judgment result, including: if the water pump is blocked, the range extender is protected, the engine performance is reduced, and the vehicle is put into an idle state.

[0041] As a specific implementation of the above embodiment, the temperature change rate threshold is determined according to the speed information and load of the engine.

[0042] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0043] In one embodiment, Figure 2 As shown, a vehicle water pump fault diagnosis device is provided, comprising: a fault prompt module, a temperature sampling module, a first comparison module, a second comparison module, a result judgment module and a range extender protection module, wherein:

[0044] A fault prompt module is used to collect the speed information of the water pump and obtain a fault prompt of the water pump based on the speed information;

[0045] A temperature collection module is used to collect the coolant temperature and the rate of change of the coolant temperature within a first period of time of the engine according to the fault prompt;

[0046] a first comparison module, configured to compare the coolant temperature with a temperature threshold to obtain a first comparison result;

[0047] a second comparison module, configured to compare the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result;

[0048] A result judgment module is used to judge whether a water pump stall fault occurs according to the first comparison result and the second comparison result, and obtain a judgment result;

[0049] The range extender protection module is used to control the range extender based on the judgment result.

[0050] The specific definitions of the vehicle water pump fault diagnostic device can be found in the definitions of the vehicle water pump fault diagnostic method described above and will not be further elaborated here. Each module in the aforementioned vehicle water pump fault diagnostic device can be implemented in whole or in part through software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor within a computer device in hardware form, or stored in a computer device memory in software form, allowing the processor to call and execute the corresponding operations of each module.

[0051] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a vehicle water pump fault diagnosis method is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad provided on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0052] Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0053] In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented: collecting speed information of a water pump and obtaining a water pump fault prompt based on the speed information; collecting a coolant temperature and a rate of change of the coolant temperature within a first time period of the engine based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; determining whether a water pump stall fault occurs based on the first comparison result and the second comparison result to obtain a determination result; and controlling the range extender based on the determination result.

[0054] In one embodiment, when the processor executes the computer program, it also implements the following steps: judging whether the water pump has a stall fault based on the first comparison result and the second comparison result, and obtaining a judgment result, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm.

[0055] In one embodiment, when the processor executes the computer program, it also implements the following steps: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm, it also includes: obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump jam fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output.

[0056] In one embodiment, when the processor executes the computer program, it also implements the following steps: after obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump stall fault within a second time period, wherein the second time period is after the time period for limiting the water pump signal output, it also includes: if the water pump fault prompt is obtained again, then the water pump stall fault occurs.

[0057] In one embodiment, when the processor executes the computer program, it also implements the following steps: judging whether the water pump has a stall fault based on the first comparison result and the second comparison result, and obtaining a judgment result, including: if the coolant temperature change rate is less than the temperature change rate threshold, then the water pump has a stall fault.

[0058] In one embodiment, when the processor executes the computer program, the processor further implements the following steps: controlling the range extender according to the judgment result, including: if a water pump stalls, protecting the range extender, reducing engine performance and idling the vehicle.

[0059] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the temperature change rate threshold is determined according to the speed information and load of the engine.

[0060] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: collecting speed information of a water pump and obtaining a water pump fault prompt based on the speed information; collecting the coolant temperature and the rate of change of the coolant temperature within a first time period of the engine based on the fault prompt; comparing the coolant temperature with a temperature threshold to obtain a first comparison result; comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; judging whether a water pump stall fault occurs based on the first comparison result and the second comparison result to obtain a judgment result; and controlling the range extender based on the judgment result.

[0061] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: judging whether the water pump has a stall fault based on the first comparison result and the second comparison result, and obtaining a judgment result, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm.

[0062] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm, it also includes: obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump jam fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output.

[0063] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: after obtaining a request to limit the water pump signal output, the signal output of the water pump is limited according to the request, and the water pump stall fault is cleared within a second time period, wherein the second time period is after the time period for limiting the water pump signal output, and further includes: if a water pump fault prompt is obtained again, a water pump stall fault occurs.

[0064] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: judging whether the water pump has a stall fault based on the first comparison result and the second comparison result, and obtaining a judgment result, including: if the coolant temperature change rate is less than the temperature change rate threshold, then the water pump has a stall fault.

[0065] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: controlling the range extender according to the judgment result, including: if a water pump stalls, protecting the range extender, reducing engine performance and placing the vehicle in an idle state.

[0066] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: the temperature change rate threshold is determined according to the speed information and load of the engine.

[0067] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0068] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A vehicle water pump fault diagnosis method, characterized in that: include: Collecting the rotation speed information of the water pump, and obtaining a fault prompt of the water pump stall fault according to the rotation speed information; collecting the coolant temperature of the engine within a first period of time and the rate of change of the coolant temperature according to the fault prompt; Comparing the coolant temperature with a temperature threshold to obtain a first comparison result; Comparing the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; Determining whether a stall fault occurs in the water pump based on the first comparison result and the second comparison result, and obtaining a determination result, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the fault prompt of the stall fault of the water pump is a false alarm; The range extender is controlled according to the judgment result.

2. The vehicle water pump fault diagnosis method according to claim 1, characterized in that: If the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the water pump fault prompt is a false alarm, the method further includes: Obtain a request to limit the water pump signal output, limit the water pump signal output according to the request, and clear the water pump jam fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output.

3. The vehicle water pump fault diagnosis method according to claim 2, characterized in that: After obtaining a request to limit the water pump signal output, limiting the water pump signal output according to the request, and clearing the water pump stall fault within a second time period, wherein the second time period is the time period for limiting the water pump signal output, the method further includes: If the water pump fault prompt is obtained again, the water pump has a stall fault.

4. The vehicle water pump fault diagnosis method according to claim 1, characterized in that: Determining whether a stall fault occurs in the water pump according to the first comparison result and the second comparison result, and obtaining a determination result, including: If the coolant temperature change rate is less than the temperature change rate threshold, the water pump is blocked.

5. The vehicle water pump fault diagnosis method according to any one of claims 1 to 4, characterized in that: According to the judgment result, the range extender is controlled, including: If the water pump is blocked, the range extender is protected, the engine performance is reduced and the vehicle is placed in an idling state.

6. The vehicle water pump fault diagnosis method according to claim 1, characterized in that: The temperature change rate threshold is determined according to the engine speed information and load.

7. A vehicle water pump fault diagnosis device, characterized in that: include: A fault prompt module is used to collect the rotation speed information of the water pump and obtain a fault prompt of a stall fault of the water pump according to the rotation speed information; a temperature collection module, configured to collect the coolant temperature of the engine within a first period of time and a rate of change of the coolant temperature according to the fault prompt; a first comparison module, configured to compare the coolant temperature with a temperature threshold to obtain a first comparison result; a second comparison module, configured to compare the rate of change of the coolant temperature with a temperature change rate threshold to obtain a second comparison result; a result judgment module, configured to judge whether the water pump has a stall fault based on the first comparison result and the second comparison result, and obtain a judgment result, including: if the coolant temperature is less than or equal to the temperature threshold, and the rate of change of the coolant temperature is greater than the temperature change rate threshold, then the fault prompt of the water pump is a false alarm; The range extender protection module is used to control the range extender according to the judgment result.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, 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 6 are implemented.

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