Insulation detection method and system of vehicle, vehicle and equipment
By using automated insulation detection methods, disconnecting the power battery or fuel cell system, and measuring the insulation resistance individually, combined with multi-source information fusion and a dynamic weighted confidence model, the problem of accurately locating insulation faults in the high-voltage system of hydrogen fuel cell vehicles is solved, improving fault diagnosis efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies cannot automatically identify the specific components with insulation faults in the high-voltage system of hydrogen fuel cell vehicles, resulting in time-consuming and dangerous repair processes. Furthermore, it is difficult to distinguish between hard insulation failure and soft insulation degradation, which can easily lead to misjudgments.
By using automated insulation detection methods, the power battery or fuel cell system is disconnected, the insulation resistance is measured individually, and by combining multi-source information fusion and dynamic weighted confidence models, the faulty component is accurately located and the corresponding safety handling strategy is executed.
It enables precise automatic location of vehicle insulation faults, improves fault diagnosis efficiency, reduces manual intervention and risks, and provides accurate maintenance guidance and predictive maintenance.
Smart Images
Figure CN121822148A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a method, system, vehicle, and equipment for detecting insulation in vehicles. Background Technology
[0002] Hydrogen fuel cell vehicles have highly integrated and complex high-voltage systems. Existing insulation detection technologies (such as the unbalanced bridge method) can typically only monitor the overall insulation resistance of the vehicle's high-voltage bus to ground. When an insulation fault occurs, the system can only issue an alarm but cannot automatically identify the specific component where the fault originates. Maintenance personnel must manually disconnect each high-voltage component one by one for troubleshooting, a time-consuming, dangerous process that is highly dependent on experience. Furthermore, it is usually impossible to effectively distinguish between "hard insulation failure" (such as breakage) in the high-voltage circuit and "soft insulation degradation" caused by increased conductivity of the fuel cell coolant, which can easily lead to misdiagnosis. Summary of the Invention
[0003] Therefore, it is necessary to provide a vehicle insulation detection method, system, vehicle, and equipment to address the aforementioned technical problems. This method and equipment can automatically and accurately locate vehicle insulation faults, thereby effectively improving fault diagnosis efficiency and facilitating vehicle repair and maintenance.
[0004] In a first aspect, an insulation testing method for a vehicle is provided, the vehicle including a high-voltage system, the high-voltage system including a power battery system and a fuel cell system, the method comprising: Obtain the insulation resistance of the high-voltage system; When the insulation resistance is abnormal, the first battery system is disconnected and the insulation resistance of the second battery system is obtained separately, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; Based on the insulation resistance of the second battery system, the battery system that has an insulation failure is determined from the first battery system and the second battery system; Obtain the insulation resistance of the battery in the battery system that has experienced an insulation failure; The insulation fault is located based on the insulation resistance of the battery in the battery system where the insulation fault occurred.
[0005] In some examples, locating the insulation fault based on the insulation resistance of the battery in the battery system where the insulation fault occurred includes: If the insulation resistance of the battery in the battery system that has experienced an insulation failure is abnormal, then it is determined that the battery in the battery system that has experienced an insulation failure has experienced an insulation failure; otherwise, it is determined that the load area of the battery system that has experienced an insulation failure has experienced an insulation failure.
[0006] In some examples, the following are also included when locating an insulation fault fails: Each high-voltage component of the battery system that has experienced an insulation failure is connected separately; Obtain the insulation resistance of each high-voltage component; Insulation faults are located based on the insulation resistance of each high-voltage component.
[0007] In some examples, it also includes: After locating the insulation fault, relevant data on the high-voltage component where the insulation fault occurred are obtained; Based on the relevant data of the high-voltage component that experienced the insulation failure, the fault type of the high-voltage component that experienced the insulation failure is determined.
[0008] In some examples, it also includes: The fault level is determined based on the fault type of the high-voltage component with insulation failure and the type of the high-voltage component. Execute the corresponding control strategy according to the fault level.
[0009] In some examples, it also includes: Based on the fault type of the high-voltage component that has experienced an insulation failure, safety handling measures are obtained from a preset safety strategy mapping table; Control the vehicle to perform the safety procedures.
[0010] In some examples, the fault type of the high-voltage component that experienced the insulation failure, as well as related data of the high-voltage component that experienced the insulation failure, are uploaded to the cloud so that the cloud can analyze the insulation health trend of the vehicle and send predictive maintenance warning messages to other vehicles.
[0011] Secondly, an insulation detection system for a vehicle is provided, the vehicle including a high-voltage system, the high-voltage system including a power battery system and a fuel cell system, the insulation detection system for the vehicle including: The acquisition module is used to obtain the insulation resistance of the high-voltage system; An isolation detection module is used to disconnect the first battery system and obtain the insulation resistance of the second battery system separately when the insulation resistance is abnormal, and to determine the battery system with insulation failure from the first battery system and the second battery system based on the insulation resistance of the second battery system, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system. The fault location module is used to obtain the insulation resistance of the battery in the battery system where the insulation fault has occurred, and to locate the insulation fault based on the insulation resistance of the battery in the battery system where the insulation fault has occurred.
[0012] Thirdly, a vehicle is provided, comprising: an insulation detection system for the vehicle according to the second aspect described above.
[0013] Fourthly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the steps of the insulation detection method for a vehicle according to the first aspect and any possible implementation thereof.
[0014] Fifthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the vehicle insulation detection method of the first aspect and any possible implementation thereof.
[0015] In a sixth aspect, a computer program product is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the vehicle insulation detection method of the first aspect and any possible implementation thereof.
[0016] Using the embodiments of this application, the insulation resistance of a high-voltage system is obtained. When the insulation resistance is abnormal, the first battery system is disconnected, and the insulation resistance of the second battery system is obtained separately. Then, based on the insulation resistance of the second battery system, the battery system with the insulation fault is determined from the first and second battery systems. Finally, the insulation resistance of the battery in the battery system with the insulation fault is obtained, and the insulation fault is located based on the insulation resistance of the battery in the battery system with the insulation fault. This method can automatically and accurately locate vehicle insulation faults, thereby effectively improving fault diagnosis efficiency and bringing convenience to vehicle repair or maintenance. Attached Figure Description
[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A flowchart illustrating the vehicle insulation testing method provided in this application embodiment; Figure 2 A schematic diagram of the high-voltage system in the vehicle insulation testing method provided in this application embodiment; Figure 3 A schematic diagram of a vehicle insulation detection system provided in an embodiment of this application; Figure 4A flowchart of a vehicle insulation testing method provided in another embodiment of this application; Figure 5 A flowchart of a vehicle insulation testing method provided in another embodiment of this application; Figure 6 A structural block diagram of a vehicle insulation detection system provided in an embodiment of this application; Figure 7 This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation
[0018] The present application will now be described in further detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.
[0019] It should be noted that, unless otherwise specified, the embodiments and features of the embodiments in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0020] The following describes in detail, with reference to the accompanying drawings, an insulation testing method, system, vehicle, and equipment for vehicles according to embodiments of this application.
[0021] The vehicle includes a high-voltage system, such as Figure 2 As shown, the high-voltage system includes a power battery system and a fuel cell system. The power battery system includes a power battery and each of the following: main positive relay 1, main negative relay 1, pre-charge relay 1, fuse, manual maintenance switch 1, each load relay, and each load (MCU, OBC & DC-DC, DC-DC, DC / AC, APTC, etc.). The fuel cell system includes a fuel cell and each of the following: main positive relay 2, main negative relay 2, pre-charge relay 2, fuse, manual maintenance switch 2, each load relay, and each load (air compressor, water pump, PTC and FC DC-DC, etc.).
[0022] Figure 1 This is a flowchart of a vehicle insulation testing method according to one embodiment of this application. Figure 1 As shown, the insulation testing method for a vehicle according to an embodiment of this application includes the following steps: S101: Obtain the insulation resistance of the high-voltage system.
[0023] like Figure 3As shown, the vehicle includes a high-voltage system and an insulation detection system. The insulation detection system comprises an insulation detection module and a main controller. The main controller executes algorithms, including diagnostic algorithms and a knowledge base. The insulation detection module includes a main detection unit and a high-voltage injection insulation detection module, which monitor the main line and branch lines respectively, calculating the insulation resistance value through voltage and current feedback; it internally contains various switch matrices. The switch matrix module executes the main controller's instructions to switch detection paths. The high-voltage distribution unit (PDU) contains not only the insulation detection module but also various component relays, fuses, manual maintenance switches (MSDs), copper busbars, and wiring harnesses; each relay is used for area isolation. The data acquisition system includes voltage / current sensors, coolant conductivity sensors, hydrogen concentration sensors, humidity sensors, aerosol sensors, pressure sensors, and temperature sensors. The onboard network (CAN / FD) is used for data communication between modules. The human-machine interface (HMI) displays fault information and handling suggestions. The high-voltage system is also known as the high-voltage energy system.
[0024] The core insulation testing of this application has passed... Figure 3 As can be seen, the connection relationships and data flow of each hardware unit are clearly displayed. For example... Figure 3 As shown, the switch matrix module is the core actuator of the entire system. It acts as a bridge connecting the insulation detection module and each high-voltage component branch, and is precisely controlled by the main controller.
[0025] S102: When the insulation resistance is abnormal, disconnect the first battery system and obtain the insulation resistance of the second battery system separately, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system.
[0026] S103: Based on the insulation resistance of the second battery system, determine the battery system that has experienced an insulation failure from the first battery system and the second battery system.
[0027] S104: Obtain the insulation resistance of the battery in the battery system that has experienced an insulation failure.
[0028] S105: Locate the insulation fault based on the insulation resistance of the battery in the battery system where the insulation fault occurred.
[0029] In one embodiment of this application, the insulation fault is located based on the insulation resistance of the battery in the battery system that has experienced an insulation fault, including: if the insulation resistance of the battery in the battery system that has experienced an insulation fault is abnormal, then it is determined that the battery in the battery system that has experienced an insulation fault has experienced an insulation fault; otherwise, it is determined that the load area of the battery system that has experienced an insulation fault has experienced an insulation fault.
[0030] In the event that the location of the insulation fault fails, the method further includes: individually connecting each high-voltage component of the battery system where the insulation fault occurred; obtaining the insulation resistance of each high-voltage component; and locating the insulation fault based on the insulation resistance of each high-voltage component.
[0031] The vehicle insulation detection method of this application embodiment further includes: after locating the insulation fault, obtaining relevant data of the high-voltage component where the insulation fault occurred; and determining the fault type of the high-voltage component where the insulation fault occurred based on the relevant data of the high-voltage component where the insulation fault occurred.
[0032] Furthermore, it also includes: determining the fault level based on the fault type of the high-voltage component that has the insulation fault and the type of the high-voltage component; and executing a corresponding control strategy based on the fault level.
[0033] The vehicle insulation detection method of this application embodiment further includes: obtaining safety handling measures from a preset safety strategy mapping table according to the fault type of the high-voltage component that has experienced an insulation fault; and controlling the vehicle to execute the safety handling measures.
[0034] Furthermore, the fault type of the high-voltage component that has experienced an insulation failure, as well as related data of the high-voltage component that has experienced an insulation failure, can be uploaded to the cloud so that the cloud can analyze the insulation health trend of the vehicle and send predictive maintenance warning messages to other vehicles.
[0035] Specifically, combined Figure 3 and Figure 4 As shown, the decision chain from anomaly detection to final handling involves an insulation detection module that monitors not only the overall vehicle insulation resistance but also the insulation of individual high-voltage components. Before the vehicle is connected to low voltage and not high voltage, the insulation detection module powers on independently to perform periodic insulation checks on the high-voltage system, detecting the overall vehicle insulation resistance IR_toal. If the IR_toal value is within the normal range, the high-voltage insulation detection module immediately lowers the voltage, and the vehicle operates normally under high voltage. If the IR_toal value falls below a threshold, an alarm is triggered, and the main controller initiates diagnostic and automatic location procedures for Phase One processing. In a segmented isolation testing process, the main controller sends commands via the CAN bus to disconnect main positive relay 3 and main negative relay 3, thus cutting off the insulation interference from the fuel cell system to the vehicle's insulation resistance IR_toal. Only the power battery system is connected for vehicle insulation resistance testing. If IR_toal returns to normal, the insulation fault is located in the fuel cell system area; then it is further determined whether the problem is with the fuel cell insulation or the fuel cell system load insulation. If IR_toal does not return to normal, the insulation fault is located in the power battery system area; then it is further determined whether the problem is with the power battery insulation or the power battery system load insulation.
[0036] After the vehicle alarm is triggered, the main controller sends a command via the CAN bus to disconnect the main positive relay 3 and main negative relay 3 inside the PDU. It is found that the insulation resistance IR_toal has not yet recovered; therefore, the fuel cell system is disconnected, leaving only the power battery system. Since the insulation fault persists, the fault is locked within the power battery area. If the insulation resistance IR_toal can recover, the fault can be locked within the fuel cell area.
[0037] If the situation remains undetermined after regional isolation, a second phase of processing is required, such as... Figure 5 As shown: The control switch matrix connects the insulation tester to each component branch within the suspected area one by one. The matrix sequentially switches the test signal from the insulation testing module to the positive and negative output terminals of each high-voltage component. Specifically, the main controller sends commands via the CAN bus to control the relays within the PDU, sequentially connecting key high-voltage loads (such as PTC, MCU, and water pump) to directly measure the insulation resistance IR_part of each component, identifying faulty components with IR_part below the threshold.
[0038] When the switching matrix switches the detection circuit to the "fuel cell" branch, and detects that the insulation resistance of this branch is 5kΩ (e.g., far below the safe value), while other branches are normal, it can accurately determine that there is an insulation fault in the dedicated wiring harness or copper busbar inside the fuel cell stack, or a coolant leak.
[0039] In the secondary positioning process, the main controller commands the switch matrix to sequentially connect the branches for "fuel cell", "air compressor", "water pump", "PTC", and "hydrogen circulation pump". When the insulation resistance of the "air compressor" branch is detected to be 0.5kΩ, the air compressor insulation is immediately determined to have failed.
[0040] Multi-source information fusion is used to determine insulation problems in various electrical components: Relevant data from faulty components is read, such as: coolant conductivity exceeding limits, temperature, humidity, pressure, hydrogen concentration trend analysis, voltage and current feedback values, and insulation resistance reduction rate for each system. A dynamic weighted confidence model is used for time-series correlation analysis to locate and diagnose the root cause of the fault: Type A: Hardware insulation failure, such as water or coolant ingress into components, shielding failure due to wiring harness damage, and internal short circuits leading to insulation failure. Type B: High coolant conductivity (fuel cell system). Type C: Transient interference / humid environment, such as condensation on high-voltage components due to high humidity.
[0041] The dynamic weighted confidence model involves an algorithm that not only performs binary judgments but also calculates a confidence level for each decision. For example, when the insulation resistance is extremely low, the conductivity is severely excessive, and the temperature is high, the confidence level for determining "coolant contamination" can reach over 95%. This confidence level is used to determine the aggressiveness of the safety strategy.
[0042] Time-series correlation analysis: The algorithm analyzes the changing trends of data, not just instantaneous values. For example, if the insulation resistance decreases slowly while the conductivity increases slowly, it strongly indicates a gradual deterioration of coolant performance (predictive maintenance). If the insulation resistance drops sharply and suddenly, while the conductivity and hydrogen concentration remain unchanged, it is very likely an insulation failure caused by a sudden hard breakdown.
[0043] In the three-level positioning process, if the air compressor insulation is determined to be faulty, the data from the air compressor cooling pipe conductivity sensor is read and found to be normal. Therefore, the final judgment is "a hard short circuit has occurred between the air compressor motor winding or wire and the housing".
[0044] In Level 3 positioning, if fuel cell insulation failure is determined, i.e., a problem with the fuel cell stack insulation, the coolant conductivity sensor data is immediately and simultaneously read after positioning. If the conductivity is normal, the problem is determined to be damage to the rigid insulation of the fuel cell stack itself, the membrane electrode assembly, or the high-voltage wiring harness. Simultaneously check if the hydrogen concentration sensor is alarming. If it is, shut down immediately. This is because if hydrogen leaks and accumulates inside the fuel cell stack, a "hydrogen atmosphere zone" with significantly reduced insulation strength will form inside these high-voltage components. Under high voltage, the normally safe electrical clearance (creepage distance) may be insufficient to withstand the voltage in a hydrogen environment, causing high-voltage electricity to arc through ionized hydrogen to the component housing (ground), resulting in insulation breakdown. Handling methods: For hydrogen leaks, shut down immediately; for non-hydrogen leaks, reduce power and shut down safely at the nearest location, requesting assistance.
[0045] If the conductivity exceeds the standard, it is judged as a "virtual" decrease in insulation, caused by excessively high ion concentration in the coolant. Solution: The system can display a message "Coolant performance deteriorates, please schedule maintenance," and can automatically start the fuel cell system's cooling circulation pump, allowing the coolant to flow through the deionizer. Observe whether the insulation resistance gradually recovers, as a self-recovery function.
[0046] In Level 3 positioning, if the power battery insulation failure is determined, read the internal temperature and aerosol sensor data of the battery pack. If the data is normal, the problem may be due to water ingress caused by a failed enclosure seal or aging of internal components. The solution is to immediately request a shutdown and display the message "High-voltage battery system insulation failure, immediate repair required."
[0047] Insulation issues with high-voltage components (such as DC-DC converters and OBCs): After locating the problem, read the fault code and temperature data for the component. The issue may be caused by internal water ingress or component breakdown. Solution: Do not use the component (if the DC-DC converter is faulty, do not use low-voltage 12V electrical equipment), restrict the vehicle's driving mode, and drive to a repair shop.
[0048] Tiered processing: Not all insulation faults require immediate shutdown. This application categorizes faulty components and types as follows: Emergency power failure (Level 3): such as severe insulation failure of the power battery or motor controller MCU or hydrogen leakage.
[0049] Level 2 (Power Limit / Function Limit) Operation: If the fault is not a critical load failure, the vehicle can be driven to a repair shop after disconnecting the faulty component.
[0050] Warning and Record (Level 1): If the coolant conductivity is slightly exceeded, it will prompt you to address the issue during the next maintenance.
[0051] Cloud-based collaboration and predictive maintenance: All insulation fault events and their data (such as faulty components, types, environmental data, and processing results) are uploaded to a cloud-based big data platform. The platform can analyze fleet-level insulation health trends and issue predictive maintenance alerts to other vehicles or service centers before a component experiences a substantial failure.
[0052] The vehicle encountered an insulation problem alarm while driving, Level 1 / Level 2 alarm (warning): displaying "low insulation resistance" or "degraded insulation performance," etc. This indicates that the system detected an anomaly, but it has not yet reached an immediately dangerous level. This provides the possibility of safely driving to a service area.
[0053] Level 3 alarm (fault): Displays "Insulation Fault," "High Voltage System Fault," "Please Stop Safely Immediately," etc. This usually means that the insulation resistance has fallen below the safe threshold, posing a high risk. Immediate stopping is necessary; continued driving is not permitted. However, if stopping is not possible immediately on a highway or in other special circumstances, the vehicle system must actively stop the fuel cell system. This means the insulation detection unit actively controls the main positive relay 3 and main negative relay 3 to disconnect, thus cutting off the fuel cell system's insulation interference to the vehicle's insulation resistance IR_toal, prompting safe braking, and driving in pure electric mode to the nearest emergency road or safe area.
[0054] Safety Policy Mapping Library: This library integrates a policy mapping system that dynamically associates the identified fault types with preset safety response measures. For "Hard Faults" (Type A): Hardware insulation failure, if an abnormally high hydrogen concentration is detected, or insulation degradation is caused by hydrogen leakage, the system alarms, immediately cuts off the hydrogen source, activates forced ventilation, and de-energizes the high-voltage system, executing an emergency high-voltage reduction. If there is no hydrogen leakage, the system executes emergency policies. 1. Record fault codes, component IDs, and environmental data.
[0055] 2. The instrument clearly indicates "Insulation failure of XX component, immediate repair required. Please drive to a safe area for repair as soon as possible. High voltage will be disconnected in 5 minutes" (except for the power battery and MCU).
[0056] 3. The insulation detection module will disconnect the components that report insulation faults (except for the power battery and MCU).
[0057] 4. If the power battery or MCU experiences an insulation failure, the instrument will display "Immediately reduce high voltage".
[0058] For "soft faults" (Type B - such as high conductivity of fuel cell coolant): a predictive maintenance strategy is implemented. The dashboard prompts: "Coolant performance has deteriorated; please schedule maintenance." In some embodiments, the system can actively control the coolant flow through the deionizer for purification and monitor in real time whether the insulation resistance recovers, achieving a certain degree of "self-recovery."
[0059] For "transient interference" (Type C): record event logs, increase monitoring frequency, ensure normal vehicle operation, and avoid unnecessary user panic.
[0060] The vehicle insulation detection method in this application does not only monitor the insulation resistance of the entire vehicle, but also dynamically divides the entire high-voltage system into different logically isolated areas (such as the power battery area, fuel cell area, and load area) by controlling the contactors within the PDU through a program. Insulation scanning is performed level by level and area by area, narrowing down the fault point from the system level to the component level. A dynamically reconfigurable detection branch path is constructed, allowing one insulation detection module to cyclically detect the input terminals of all key high-voltage components. Based on a multi-channel switching matrix detection network, a multiplexed switching matrix module is integrated within the PDU. This module is controlled by the main controller and can sequentially and accurately switch the test signal from a single insulation detection module to the positive and negative input terminals of each high-voltage component, thereby directly measuring the insulation resistance of that component's branch and achieving precise location. Signals such as the rate of change of insulation resistance, coolant conductivity, hydrogen concentration, and ambient humidity are fused and analyzed. For example, when an insulation abnormality is detected in the fuel cell area, if the coolant conductivity is also found to be excessive, it is judged as a "virtual insulation degradation," prompting maintenance of the cooling system; if the conductivity is normal, it is judged as a "hard insulation fault" in the fuel cell stack or wiring harness. This makes a final judgment on the nature of the fault (whether it is hardware damage or media contamination). A built-in fault handling knowledge base is included. Once the faulty component and type are located, the system can automatically execute preset, tiered safety strategies (from "early warning" to "power limiting" to "emergency power-off"), and supports OTA updates to the knowledge base, providing precise maintenance guidance through a human-machine interface (HMI). Before the fuel cell stack is started and connected to the main high-voltage system, it undergoes an independent "pre-inspection," and only those that pass are allowed to connect, preventing "operation with defects" from the outset.
[0061] The vehicle insulation detection method according to embodiments of this application obtains the insulation resistance of the high-voltage system. When the insulation resistance is abnormal, the first battery system is disconnected, and the insulation resistance of the second battery system is obtained separately. Then, based on the insulation resistance of the second battery system, the battery system with the insulation fault is determined from the first and second battery systems. Finally, the insulation resistance of the battery in the battery system with the insulation fault is obtained, and the insulation fault is located based on the insulation resistance of the battery in the battery system with the insulation fault. This method can automatically and accurately locate vehicle insulation faults, thereby effectively improving fault diagnosis efficiency and facilitating vehicle repair or maintenance.
[0062] Figure 6 This is a structural block diagram of a vehicle insulation detection system according to one embodiment of this application. Figure 3 As shown, the vehicle insulation detection system according to an embodiment of this application includes: an acquisition module 610, an isolation detection module 620, and a fault location module 630, wherein: The acquisition module 610 is used to obtain the insulation resistance of the high-voltage system; The isolation detection module 620 is used to disconnect the first battery system and obtain the insulation resistance of the second battery system separately when the insulation resistance is abnormal, and to determine the battery system that has an insulation fault from the first battery system and the second battery system based on the insulation resistance of the second battery system, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system. The fault location module 630 is used to obtain the insulation resistance of the battery in the battery system where the insulation fault has occurred, and to locate the insulation fault based on the insulation resistance of the battery in the battery system where the insulation fault has occurred.
[0063] The vehicle insulation detection system according to an embodiment of this application obtains the insulation resistance of the high-voltage system. When the insulation resistance is abnormal, the first battery system is disconnected, and the insulation resistance of the second battery system is obtained separately. Then, based on the insulation resistance of the second battery system, the battery system with the insulation fault is determined from the first and second battery systems. Finally, the insulation resistance of the battery in the battery system with the insulation fault is obtained, and the insulation fault is located based on the insulation resistance of the battery in the battery system with the insulation fault. This system can automatically and accurately locate vehicle insulation faults, thereby effectively improving fault diagnosis efficiency and facilitating vehicle repair and maintenance.
[0064] Specific limitations regarding the vehicle insulation testing system can be found in the above-described limitations of the vehicle insulation testing method, and will not be repeated here. Each module of the aforementioned vehicle insulation testing system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the computer device's memory in software form, so that the processor can call and execute the corresponding operations of each module.
[0065] In one embodiment, a vehicle is provided, comprising: an insulation detection system for a vehicle according to any of the above embodiments. The vehicle can obtain the insulation resistance of a high-voltage system; when the insulation resistance is abnormal, disconnect a first battery system and obtain the insulation resistance of a second battery system separately; then, based on the insulation resistance of the second battery system, determine the battery system with the insulation fault from the first and second battery systems; finally, obtain the insulation resistance of the battery in the battery system with the insulation fault; and locate the insulation fault based on the insulation resistance of the battery in the battery system with the insulation fault. This system can automatically and accurately locate vehicle insulation faults, thereby effectively improving fault diagnosis efficiency and facilitating vehicle repair or maintenance.
[0066] Furthermore, other components and functions of the vehicle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.
[0067] In one embodiment, a computer device is provided. Figure 7 This is a structural block diagram of the computer device provided in the embodiments of this application, with reference to... Figure 7 The computer device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned embodiment of the vehicle insulation detection method. For example, it executes: obtaining the insulation resistance of the high-voltage system; When the insulation resistance is abnormal, the first battery system is disconnected and the insulation resistance of the second battery system is obtained separately, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; Based on the insulation resistance of the second battery system, the battery system that has an insulation failure is determined from the first battery system and the second battery system; Obtain the insulation resistance of the battery in the battery system that has experienced an insulation failure; The insulation fault is located based on the insulation resistance of the battery in the battery system where the insulation fault occurred.
[0068] This application also provides a computer-readable storage medium storing a computer program. When a processor executes the computer program, it implements the aforementioned vehicle insulation detection method embodiment. For example, it executes: obtaining the insulation resistance of the high-voltage system; When the insulation resistance is abnormal, the first battery system is disconnected and the insulation resistance of the second battery system is obtained separately, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; Based on the insulation resistance of the second battery system, the battery system that has an insulation failure is determined from the first battery system and the second battery system; Obtain the insulation resistance of the battery in the battery system that has experienced an insulation failure; The insulation fault is located based on the insulation resistance of the battery in the battery system where the insulation fault occurred.
[0069] This application provides a computer program product including instructions that, when executed, cause the method described in this application embodiment to be performed. For example, it can execute... Figure 1The steps of the insulation testing method for the vehicle shown are performed, for example: Obtain the insulation resistance of the high-voltage system; When the insulation resistance is abnormal, the first battery system is disconnected and the insulation resistance of the second battery system is obtained separately, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; Based on the insulation resistance of the second battery system, the battery system that has an insulation failure is determined from the first battery system and the second battery system; Obtain the insulation resistance of the battery in the battery system that has experienced an insulation failure; The insulation fault is located based on the insulation resistance of the battery in the battery system where the insulation fault occurred.
[0070] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.
[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.
[0072] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An insulation detection method of a vehicle, characterized by, The vehicle comprises a high-voltage system including a power battery system and a fuel cell system, and the method comprises: obtaining insulation resistance of the high-voltage system; when the insulation resistance is abnormal, disconnecting a first battery system and separately obtaining insulation resistance of a second battery system, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; determining a battery system with insulation failure from the first battery system and the second battery system according to the insulation resistance of the second battery system; obtaining insulation resistance of a battery of the battery system with insulation failure; locating insulation failure according to the insulation resistance of the battery of the battery system with insulation failure.
2. The insulation detection method of a vehicle according to claim 1, characterized by, The locating insulation failure according to the insulation resistance of the battery of the battery system with insulation failure comprises: if the insulation resistance of the battery of the battery system with insulation failure is abnormal, determining that the battery of the battery system with insulation failure has insulation failure, otherwise, determining that a load area of the battery system with insulation failure has insulation failure.
3. The insulation detection method of a vehicle according to claim 1 or 2, characterized by, In the case of failure to locate insulation failure, further comprising: respectively and separately connecting each high-voltage component of the battery system with insulation failure; obtaining insulation resistance of each high-voltage component; locating insulation failure according to the insulation resistance of each high-voltage component.
4. The insulation detection method of a vehicle according to claim 3, characterized by, Further comprising: after locating insulation failure, obtaining relevant data of the high-voltage component with insulation failure; determining a fault type of the high-voltage component with insulation failure according to the relevant data of the high-voltage component with insulation failure.
5. The insulation detection method of a vehicle according to claim 4, characterized by, Further comprising: determining a fault level according to the fault type of the high-voltage component with insulation failure and the type of high-voltage component; performing a corresponding control strategy according to the fault level.
6. The insulation detection method of a vehicle according to claim 4, characterized by Further comprising: obtaining a safety handling measure from a preset safety strategy mapping table according to the fault type of the high-voltage component with insulation failure; controlling the vehicle to perform the safety handling measure.
7. The insulation detection method of a vehicle according to claim 4, characterized by, uploading the fault type of the high-voltage component with insulation failure and the relevant data of the high-voltage component with insulation failure to the cloud, so that the cloud analyzes insulation health trend of the vehicle and issues a predictive maintenance warning message to other vehicles.
8. An insulation detection system of a vehicle, characterized by comprising: The vehicle comprises a high-voltage system including a power battery system and a fuel cell system, and an insulation detection system of the vehicle comprises: an acquisition module for obtaining insulation resistance of the high-voltage system; an isolation detection module for disconnecting a first battery system when the insulation resistance is abnormal, separately obtaining insulation resistance of a second battery system, and determining a battery system with insulation failure from the first battery system and the second battery system according to the insulation resistance of the second battery system, wherein the first battery system is one of the power battery system and the fuel cell system, and the second battery system is the other of the power battery system and the fuel cell system; A fault location module is configured to obtain insulation resistances of the batteries of the battery system in which insulation faults occur, and locate the insulation faults according to the insulation resistances of the batteries of the battery system in which insulation faults occur.
9. A vehicle characterized by comprising: The application comprises: The insulation detection system of the vehicle according to claim 8.
10. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the insulation detection method of the vehicle according to any one of claims 1-7 when executing the program. The processor implements the insulation detection method of the vehicle according to any one of claims 1-7 when executing the program.