Hybrid vehicle obd diagnosis method, device and vehicle

Abstract

The application discloses a hybrid vehicle OBD diagnosis method and device and a vehicle, and relates to the technical field of vehicle OBD diagnosis, and in particular relates to a hybrid vehicle OBD diagnosis method, a hybrid vehicle OBD diagnosis device and a hybrid vehicle. The method comprises the following steps: acquiring real-time operation parameters of OBD related components to identify OBD related faults; confirming and processing the OBD related faults according to preset bits and clearing conditions to obtain a fault processing flag bit, a pending fault flag bit, a confirmed fault flag bit, a permanent fault flag bit and a MIL lamp lighting request flag bit; storing the pending fault flag bit, the confirmed fault flag bit and the permanent fault flag bit; performing fault processing control according to the fault processing flag bit according to preset fault processing requirements; and controlling the MIL lamp according to the MIL lamp lighting request flag bit, so that the hybrid vehicle OBD diagnosis full function is realized, the existing emission requirements are met, and the hybrid vehicle is suitable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a hybrid vehicle OBD diagnosis method and device and vehicle. BACKGROUND

[0002] The pollution of automobile emissions has also attracted more and more attention from the world, and the current emission regulations are becoming more and more stringent. The OBD (On-Bard Diagnostic) system has emerged as the times require. With the continuous improvement of the electrification level of vehicles, compared with traditional vehicles, hybrid vehicles have added high-voltage batteries, motors and other high-voltage components, and the electrical and electronic control systems are more complex. The requirements for OBD diagnosis methods are higher, and in view of the different hybrid power configurations, network architectures and control schemes, the existing traditional OBD diagnosis related technologies cannot be directly used in hybrid vehicles. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a hybrid vehicle OBD diagnosis method, which realizes the full function of hybrid vehicle OBD diagnosis, meets the existing emission requirements and is suitable for hybrid vehicles.

[0004] According to the hybrid vehicle OBD diagnosis method of the first aspect of the embodiment of the present application, the method comprises:

[0005] Obtaining real-time running parameters of OBD related components;

[0006] Comparing the real-time running parameters with preset running parameters to identify OBD related faults;

[0007] According to the preset bit and the clearing condition, the OBD related faults are confirmed to obtain a fault processing flag bit, a pending fault flag bit, a confirmed fault flag bit, a permanent fault flag bit and a MIL lamp lighting request flag bit;

[0008] Storing the pending fault flag bit, the confirmed fault flag bit and the permanent fault flag bit;

[0009] According to the fault processing flag bit, fault processing control is performed according to the preset fault processing requirement;

[0010] According to the MIL lamp lighting request flag bit, the MIL lamp is controlled.

[0011] The hybrid vehicle OBD diagnosis method according to the embodiment of the present application has at least the following beneficial effects:

[0012] The application compares real-time operation parameters of OBD related components with preset operation parameters to identify OBD related faults, confirms the OBD related faults according to preset bits and clearing conditions to obtain fault processing flag bits, pending fault flag bits, confirmed fault flag bits, permanent fault flag bits, MIL lamp lighting request flag bits, stores the pending fault flag bits, the confirmed fault flag bits and the permanent fault flag bits, controls fault processing according to the fault processing flag bits according to preset fault processing requirements, and controls the MIL lamp according to the MIL lamp lighting request flag bits, so as to realize full function of OBD diagnosis of a hybrid vehicle, meet existing emission requirements and be suitable for hybrid electric vehicles.

[0013] According to some embodiments of the application, the confirming the OBD related faults according to preset bits and clearing conditions comprises:

[0014] setting the pending fault flag bit of each fault;

[0015] if the fault is continuously received in the next driving cycle, the pending fault flag bit of the fault is continuously set;

[0016] if the fault is not received in the next driving cycle, the pending fault flag bit of the fault is cleared.

[0017] According to some embodiments of the application, the confirming the OBD related faults according to preset bits and clearing conditions comprises:

[0018] setting the confirmed fault flag bit of the fault which causes the vehicle power system to enter a limp home mode affecting emission or OBD system performance;

[0019] for pump, fan body fault and circuit fault of control pin, the confirmed fault flag bit is not set first, and then the confirmed fault flag bit of the fault is set when the fault is received in the next driving cycle.

[0020] According to some embodiments of the application, the confirming the OBD related faults according to preset bits and clearing conditions comprises:

[0021] obtaining the warm-up cycle information of the engine, and if the same fault as the previous confirmed fault is not detected in the first preset number of warm-up cycles, the corresponding confirmed fault flag bit is cleared.

[0022] According to some embodiments of the application, the confirming the OBD related faults according to preset bits and clearing conditions comprises:

[0023] When the confirmation fault flag of the fault is set, the permanent fault flag of the fault is set at the end of the driving cycle, and if the fault is not detected for a second preset number of continuous driving cycles, the permanent fault flag of the fault is cleared.

[0024] According to some embodiments of the present application, the confirmation processing of the OBD-related fault according to the preset setting and clearing conditions further comprises:

[0025] When the confirmation fault flag is set, the MIL lamp lighting request flag is set;

[0026] When the confirmation fault flag is not set and the permanent fault flag is not set, the MIL lamp lighting request flag is cleared.

[0027] According to some embodiments of the present application, the storage of the pending fault flag, the confirmation fault flag, and the permanent fault flag comprises:

[0028] When the pending fault flag is set, the pending fault is stored for a preset time, and when the pending fault flag is cleared, the corresponding fault is cleared;

[0029] When the confirmation fault flag is set, the confirmation fault is stored for a preset time, and when the confirmation fault flag is cleared, the corresponding fault is cleared;

[0030] When the permanent fault flag is set, the permanent fault is immediately stored, and when the permanent fault flag is cleared, the corresponding fault is cleared.

[0031] According to a second aspect of an embodiment of the present application, a hybrid vehicle OBD diagnosis device comprises:

[0032] A fault identification module is configured to acquire real-time running parameters of OBD-related components, compare the real-time running parameters with preset running parameters, and identify OBD-related faults;

[0033] A fault confirmation module is configured to confirm the OBD-related faults according to preset setting and clearing conditions, and obtain a fault processing flag, a pending fault flag, a confirmation fault flag, a permanent fault flag, and a MIL lamp lighting request flag;

[0034] A fault processing module is configured to perform fault processing control according to the fault processing flag and preset fault processing requirements.

[0035] A fault storage module is configured to store the pending fault flag, the confirmation fault flag, and the permanent fault flag.

[0036] The MIL lamp lighting module is used for controlling the MIL lamp according to the MIL lamp lighting request flag.

[0037] A vehicle according to a third aspect of the present application comprises the hybrid vehicle OBD diagnosis device.

[0038] A computer readable storage medium according to a fourth aspect of the present application stores computer executable instructions for causing a computer to execute the hybrid vehicle OBD diagnosis method.

[0039] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] The present application is further described below with reference to the accompanying drawings and examples, wherein:

[0041] Figure 1 A schematic diagram of a hybrid electric vehicle power system structure of the present application;

[0042] Figure 2 A schematic diagram of a hybrid electric system control scheme of the present application;

[0043] Figure 3 A schematic diagram of a hybrid electric system OBD architecture of the present application;

[0044] Figure 4 A step flow chart of a hybrid electric vehicle OBD diagnosis method of the present application;

[0045] Figure 5 A schematic diagram of a hybrid electric vehicle OBD diagnosis device of the present application. DETAILED DESCRIPTION

[0046] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary, only for explaining the present application, and cannot be understood as limiting the present application.

[0047] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In the description of the present application, plural means more than two. If there is a description of the first, second, only for the purpose of distinguishing technical features, and can not be understood as indicating or implying the relative importance or implied indicating the number of indicated technical features or implied indicating the order of the indicated technical features.

[0049] In the description of the present application, unless otherwise expressly limited, the words such as set, install, connect, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0050] The technical solutions of the present application will be described below in conjunction with the accompanying drawings. Obviously, the following described embodiments are part of the embodiments of the present application, not all embodiments.

[0051] The existing hybrid OBD diagnosis related technology, either focuses on the design of OBD diagnosis device, does not involve control method; or focuses on maintaining OBD diagnosis working condition on the basis of ensuring vehicle power; or focuses on accurately identifying the effective cycle of hybrid electric vehicle. In view of the different hybrid configurations, network architecture and control scheme, the previous OBD diagnosis device and control method cannot be directly borrowed, and a complete hybrid vehicle OBD diagnosis method and device need to be established.

[0052] As Figure 1As shown, the hybrid power system structure to which the embodiment of the application is directed includes an engine 100, a generator 200, a drive motor 300, a power battery 400, a clutch 500, a reduction device 600, the drive motor 300 is connected with the power battery 400 through a drive motor inverter 320, the generator 200 is connected with the power battery 400 through a generator inverter 220, the engine 100 is connected with the generator 200 through a gear pair, the engine 100 can be started through the generator 200, when the clutch 500 is disconnected, the engine 100 does not participate in directly driving the vehicle, but drives the generator 200 to generate electricity to provide energy for the battery or the drive motor 300 to drive the vehicle to run by the drive motor 300, when the clutch 500 is engaged, the engine 100 torque is transmitted to the wheel end 700 through the clutch 500 and the reduction device 600, the engine 100 can drive the hybrid vehicle together with the drive motor 300. In addition, each assembly of the dual-motor hybrid power is monitored and adjusted by a special controller, for example, the drive motor 300 is controlled by a drive motor control unit 310, the generator 200 is controlled by a generator control unit 210, the power battery 400 is controlled by a battery management system 410, the engine 100 is controlled by an engine management system 110, each assembly controller monitors and identifies the fault state of itself in real time, and sends the vehicle control unit 800 through the CAN line. The vehicle control unit 800 identifies the driver's operation, receives the relevant component information and fault information sent by the engine 100, drive motor 300, generator 200, battery and other controllers, identifies the state and fault of the clutch 500 and itself, sends control instructions to the related controllers, coordinates the control of all components to run in order, realizes the functions of hybrid power driving and brake energy recovery, and ensures the safe and reliable operation of the vehicle according to the driver's demand in the case of fault

[0053] The hybrid working modes of the hybrid power system structure of the hybrid electric vehicle mainly include: (1) parking stop, the hybrid electric vehicle is in a parking state, the engine 100 is in a stop state, the clutch 500 is in a separated state, and the vehicle control unit 800 stops sending an oil injection instruction and a related torque instruction; (2) pure electric mode, when the battery capacity is sufficient and the vehicle speed and the driver demand torque are small, the engine 100 is stopped, and the vehicle is driven by the driving motor 300 to travel and regenerate brake; (3) series mode, when the vehicle speed is increased or the driver demand torque is large, the engine 100 generates electricity through the generator 200 and the power battery 400 together as the energy source of the driving motor 300, or provides the driving motor 300 with electricity while charging the power battery 400; (4) parallel mode, when the vehicle speed continues to increase and the driver demand torque decreases, the clutch 500 is engaged, the engine 100 directly drives to participate in driving, the generator 200 generates electricity according to the power battery 400 and the engine 100 load, and when the driver demand torque is greater than the upper limit of the economic zone of the engine 100 or the engine 100 responds slowly, the driving motor 300 assists.

[0054] As Figure 2 The hybrid power system control scheme to which the embodiment of the application is directed, the vehicle control unit 800 is the brain of the hybrid electric vehicle, which recognizes the accelerator pedal, the brake pedal, the gear, the clutch and the like, receives the related component information and the vehicle speed signal sent by the engine management system 110, the driving motor control unit 310, the generator control unit 210, the battery management system 410 and the like through the CAN line, calculates the driver demand torque, and sends the control instruction to the related controller through the CAN line to coordinate the control of all power components (engine, clutch, driving motor, generator, power battery) to realize the functions of hybrid power driving and brake energy recovery. In addition, the vehicle control unit is responsible for the control of the thermal management system of the hybrid electric vehicle, recognizes the water temperature according to the water temperature sensor, and controls the fan and the water pump according to the established strategy to ensure the reasonable working temperature of the engine, the driving motor, the generator and the power battery.

[0055] As Figure 3The hybrid power system OBD architecture to which the embodiment of the application shown is directed, since the engine management system 110 monitors more engine emission related indicators than hybrid power specific components, in order to save network resources, the engine management system 110 is selected as the main OBD controller, the vehicle control unit 800 and the vehicle body electronic stability control system are selected as the first level OBD controller, and the drive motor control unit 310, the generator control unit 210 and the battery management system 410 are selected as the second level OBD controller. The engine management system 110, the vehicle control unit 800 and the vehicle body electronic stability control system can all communicate with the diagnostic tool, the vehicle control unit 800 and the vehicle body electronic stability control system support part of the diagnostic service according to the data interaction needs, and the engine management system 110 is responsible for implementing all diagnostic services and arbitration of the MIL state. The drive motor control unit 310, the generator control unit 210 and the battery management system 410 as the second level OBD controller of the vehicle control unit 800 do not need to directly interact with the diagnostic tool, do not need to support the OBD diagnostic service, only need to have the OBD fault identification function, and send the related information to the vehicle control unit 800 through the CAN bus, and the vehicle control unit 800 implements the hybrid power related OBD fault management and the diagnostic tool communication function. The hybrid power system OBD architecture scheme decomposes the vehicle OBD function into each first level controller for implementation, the second level controller does not need to support the OBD diagnostic service, reduces the requirements on each controller, and greatly reduces the development cost.

[0056] The OBD diagnostic functions of the engine management system 110 and the vehicle body electronic stability control system are the same as those of the conventional vehicle, and are not the focus of the application. The hybrid power vehicle OBD diagnostic device of the application is mainly arranged in the vehicle control unit 800, and the OBD diagnostic method provided is also for the vehicle control unit 800.

[0057] As shown in the figure, Figure 4 The hybrid power vehicle OBD diagnostic method of the embodiment of the application includes but is not limited to the following steps:

[0058] Step S100: acquiring real-time running parameters of OBD related components;

[0059] Step S200: comparing the real-time running parameters with preset running parameters to identify OBD related faults;

[0060] Step S300: confirming the OBD related faults according to preset bits and clearing conditions to obtain a fault processing flag bit, a pending fault flag bit, a confirmed fault flag bit, a permanent fault flag bit and a MIL lamp lighting request flag bit;

[0061] Step S400: storing the pending fault flag bit, the confirmed fault flag bit and the permanent fault flag bit.

[0062] Step S500: according to the fault handling flag, the preset fault handling requirement is handled.

[0063] Step S600: according to the MIL lamp lighting request flag, the MIL lamp is controlled.

[0064] The real-time running parameters of the OBD related components are compared with the preset running parameters to identify the OBD related faults, the OBD related faults are confirmed and handled according to the preset bits and the clearing conditions, the fault handling flag, the pending fault flag, the confirmed fault flag, the permanent fault flag and the MIL lamp lighting request flag are obtained, the pending fault flag, the confirmed fault flag and the permanent fault flag are stored, the fault handling control is performed according to the fault handling flag and the preset fault handling requirement, and the MIL lamp is controlled according to the MIL lamp lighting request flag, so that the OBD diagnosis full function of the hybrid vehicle is realized, the existing emission requirements are met, and the hybrid vehicle is suitable.

[0065] In step S100, according to the hybrid power system control scheme, the real-time running parameters of the OBD related components include but are not limited to the running parameters of the accelerator pedal, the running parameters of the brake pedal, the running parameters of the proportional pressure valve, the running parameters of the vehicle control unit 800, the communication parameters of the drive motor control unit 310, the generator control unit 210 and the battery management system 410, the running parameters of the water pump, the running parameters of the fan, the running parameters of the control pin, etc.

[0066] Further in step S200, the OBD related faults include but are not limited to the accelerator pedal faults (sensor supply voltage exceeds the upper limit, sensor supply voltage exceeds the lower limit, sensor voltage exceeds the upper limit, sensor voltage exceeds the lower limit), brake pedal faults (brake pedal difference fault, brake failure fault), proportional pressure valve faults (proportional pressure valve control pin short circuit to the power supply, short circuit to the ground, open circuit), vehicle control unit 800 itself faults (over temperature, power supply fault), communication faults of the drive motor control unit 310, the generator control unit 210 and the battery management system 410, water pump body faults, fan body faults and control pin circuit faults, etc. In addition, the OBD faults related to the motor system and the battery system are also included.

[0067] It can be understood that by detecting the real-time running parameters of the OBD related components and comparing them with the preset running parameters, the OBD related faults are determined, and the setting of the preset running parameters is determined according to different working conditions and vehicle models, wherein the OBD related faults cause the hybrid vehicle to perform limp control or affect the cooling system function.

[0068] Since the identified OBD-related faults will cause the hybrid vehicle to perform limp-home control or affect the cooling system function, in step S300, for the confirmation of the fault handling flag, no setting is made for the pre-set flag and the clearing condition. It can be understood that, after the OBD-related fault is identified, the fault handling flag is directly generated.

[0069] For the confirmation of the pending fault flag, after the OBD-related fault is identified, the pending fault flag of each fault is first set. If the fault is continuously received in the next driving cycle, the pending fault flag of the fault is continuously set. If the fault is not received in the next driving cycle, the pending fault flag of the fault is cleared.

[0070] For the confirmation of the confirmed fault flag, for the accelerator pedal, the brake pedal, the proportional pressure valve, the vehicle control unit 800 itself fault, the motor system fault, the battery system fault, and the communication fault with the drive motor control unit 310, the generator control unit 210, and the battery management system 410, it will cause the power system to enter a limp-home mode that can affect the emission or OBD system performance. Therefore, after the OBD-related fault is identified, the confirmed fault flag of the fault that causes the vehicle power system to enter the limp-home mode that affects the emission or OBD system performance is also set, which is synchronized with the pending fault flag of the fault.

[0071] For the water pump, the fan body fault, and the circuit fault of the control pin, the confirmed fault flag is not set first. The confirmed fault flag of the fault is set again when the fault is received in the next driving cycle.

[0072] In the process of confirming the confirmed fault flag, the warm-up cycle information of the engine is obtained. If the same fault as the previously confirmed fault is not detected in the first pre-set number of warm-up cycles, the corresponding confirmed fault flag is cleared. It can be understood that, if the same fault as the previously confirmed fault is not detected in 40 warm-up cycles, the corresponding confirmed fault flag is cleared at the end of the 41st warm-up cycle.

[0073] For the confirmation of the permanent fault flag, when the confirmed fault flag of the fault is set, the permanent fault flag of the fault is set at the end of the driving cycle. If the fault is not monitored in the second pre-set number of continuous driving cycles, the permanent fault flag of the fault is cleared.

[0074] For the confirmation of the MIL lamp lighting request flag, when the confirmed fault flag is set, the MIL lamp lighting request flag is set. When the confirmed fault flag is not set and the permanent fault flag is not set, the MIL lamp lighting request flag is cleared.

[0075] In step S400, when the pending fault flag bit is set, the pending fault is stored for a preset time, and when the pending fault flag bit is cleared, the corresponding fault is cleared; when the confirmed fault flag bit is set, the confirmed fault is stored for a preset time, and when the confirmed fault flag bit is cleared, the corresponding fault is cleared; when the permanent fault flag bit is set, the permanent fault is immediately stored, and when the permanent fault flag bit is cleared, the corresponding fault is cleared.

[0076] The preset time is set to 10s, and other times can be set in other embodiments.

[0077] In step S500, limp control or cooling system redundancy control is performed according to the fault handling flag bit and predetermined fault handling requirements.

[0078] As shown in Figure 5 The application also provides a hybrid vehicle OBD diagnosis device, which comprises a fault identification module, a fault confirmation module, a fault handling module, a fault storage module and a MIL lamp lighting module. The fault identification module is used to obtain real-time operation parameters of OBD related components, compare the real-time operation parameters with preset operation parameters, and identify OBD related faults. The fault confirmation module is used to confirm OBD related faults according to preset setting and clearing conditions, and obtain a fault handling flag bit, a pending fault flag bit, a confirmed fault flag bit, a permanent fault flag bit and a MIL lamp lighting request flag bit. The fault handling module is used to perform fault handling control according to the fault handling flag bit and predetermined fault handling requirements. The fault storage module is used to store the pending fault flag bit, the confirmed fault flag bit and the permanent fault flag bit. The MIL lamp lighting module is used to control the MIL lamp according to the MIL lamp lighting request flag bit.

[0079] The fault confirmation module is mainly responsible for confirming faults, and then giving the fault handling module, the fault storage module and the MIL lamp lighting module. The MIL lamp lighting module completes the lighting and extinguishing of the MIL lamp according to the MIL lamp lighting request signal.

[0080] The application can effectively link fault handling, fault storage and fault reminding through the setting of the fault confirmation module, solves the problem of asynchronous functions, and thus realizes the full function of hybrid vehicle OBD diagnosis.

[0081] The application also provides a vehicle comprising the hybrid vehicle OBD diagnosis device. It can be understood that the contents in the above hybrid vehicle OBD diagnosis device embodiment are applicable to the vehicle embodiment. The vehicle embodiment specifically realizes the same functions as the hybrid vehicle OBD diagnosis device embodiment, and achieves the same beneficial effects as the above hybrid vehicle OBD diagnosis device embodiment.

[0082] A computer readable storage medium according to an embodiment of the present application has a computer program stored thereon, which, when executed by a processor, implements the hybrid vehicle OBD diagnosis method described above.

[0083] The computer readable storage medium according to an embodiment of the present application can adopt any combination of one or more computer readable media. The computer readable medium can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In an embodiment of the present application, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0084] The computer readable signal medium can include a computer readable program code carried in a baseband or as a part of a carrier wave, in which the computer readable program code is borne. Such a propagated data signal can take a variety of forms, including but not limited to electro-magnetic, optical, or any suitable combination of the above. The computer readable signal medium can also be any computer readable medium that is not a computer readable storage medium and that can be used to carry or store a program for use by or in connection with an instruction execution system, apparatus, or device.

[0085] The program code contained in the computer readable medium can be transmitted by any suitable medium, including but not limited to wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0086] It should be understood that various parts of the present application can be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and as in another embodiment, it can be implemented by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gates for implementing logical functions of data signals, application specific integrated circuit with suitable combination of logic gates, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0087] In the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0088] The embodiments of the application are described in detail above in connection with the accompanying drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A method for OBD diagnosis of a hybrid vehicle, characterized in that, include: Step S100: Obtain the real-time operating parameters of OBD-related components; Step S200: Compare the real-time operating parameters with the preset operating parameters to identify OBD-related faults; Step S300: Confirm the OBD-related faults according to the preset bits and clearing conditions to obtain the fault handling flag bit, unresolved fault flag bit, confirmed fault flag bit, permanent fault flag bit, and MIL light illumination request flag bit. Step S400: Store the pending fault flag, the confirmed fault flag, and the permanent fault flag; Step S5 00: Perform fault handling control according to the preset fault handling requirements based on the fault handling flag bit; Step S6 00: Control the MIL lamp according to the MIL lamp lighting request flag; Step S300 includes: Set the pending fault flag for each fault; If the fault is received again in the next driving cycle, the pending fault flag will remain set. If the fault is not received in the next driving cycle, clear the pending fault flag for that fault. The setting of the fault flag indicates a confirmed fault that causes the vehicle's powertrain to enter a limp-mode operation that affects emissions or the performance of the OBD system. For water pump, fan body failures and control pin circuit failures, do not set the confirmation fault flag bit first. Set the confirmation fault flag bit when the failure is received in the next driving cycle. Obtain engine warm-up cycle information. If no fault identical to the previously confirmed fault is detected in the first preset number of warm-up cycles, clear the corresponding confirmed fault flag bit. When the aforementioned fault confirmation flag is in position, the MIL light illuminates the request flag position. When neither the confirmed fault flag nor the permanent fault flag is set, the MIL light illumination request flag is cleared.

2. The OBD diagnostic method for hybrid vehicles according to claim 1, characterized in that: The storage of the pending fault flag, the confirmed fault flag, and the permanent fault flag includes: When the pending fault flag is set, the pending fault is stored for a preset time, and when the pending fault flag is cleared, the corresponding fault is cleared. When the confirmed fault flag is set, the confirmed fault is stored for a preset time; when the confirmed fault flag is cleared, the corresponding fault is cleared. When the permanent fault flag is set, the permanent fault is stored immediately; when the permanent fault flag is cleared, the corresponding fault is cleared.

3. An OBD diagnostic device for hybrid vehicles, characterized in that, The hybrid vehicle OBD diagnostic device, applicable to the hybrid vehicle OBD diagnostic method as described in any one of claims 1 and 2, comprises: The fault identification module is used to acquire real-time operating parameters of OBD-related components; compare the real-time operating parameters with preset operating parameters to identify OBD-related faults; The fault confirmation module is used to confirm and process the OBD-related faults according to preset bits and clearing conditions, and obtain fault processing flag bit, unresolved fault flag bit, confirmed fault flag bit, permanent fault flag bit, and MIL light lighting request flag bit. The fault handling module is used to perform fault handling control according to the preset fault handling requirements based on the fault handling flag bit. The fault storage module is used to store the pending fault flag, the confirmed fault flag, and the permanent fault flag. The MIL lamp lighting module is used to control the MIL lamp according to the MIL lamp lighting request flag.

4. A vehicle, characterized in that, It includes the OBD diagnostic device for hybrid vehicles as described in claim 3.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the OBD diagnostic method for a hybrid vehicle as described in any one of claims 1 and 2.

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