Whole vehicle part insulation confirmation device based on insulation detection unit

Abstract

The invention relates to the technical field of insulation confirmation, in particular to a whole vehicle part insulation confirmation device based on an insulation detection unit, which comprises the following steps: when a whole vehicle detects an insulation fault, when a preset safety condition is met, disconnecting a battery main loop relay, and storing initial fault information; the method has the advantages that the relay is controlled to be switched off / switched on gradually through software, real-time feedback of the insulation detection unit is combined, the insulation fault can be positioned to a specific loop instead of being checked in the whole vehicle range, wire harness or part detection can be directly carried out on stored fault branches during maintenance, and the fault detection efficiency is improved. Blind inspection is avoided, the maintenance time is shortened, and the labor cost is reduced; after an insulation fault of a non-key high-voltage loop is isolated instead of stopping the whole vehicle and a fault loop relay is disconnected, the READY lamp of the whole vehicle is kept on, the vehicle is allowed to continue running, the situation that the vehicle lies down due to a non-key function fault is avoided, and the utilization rate of the vehicle is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation confirmation, in particular to a device for confirming the insulation of vehicle parts based on an insulation detection unit. Background Art

[0002] Currently, the market share of new energy vehicles is increasing, expanding from passenger cars to commercial vehicles and even mining trucks. During operation, if a new energy vehicle experiences damage to high-voltage components, water ingress, or damage to the high-voltage wiring harness, the vehicle's insulation module will detect low insulation values. In this case, the vehicle will shut down, issue a fault alarm through the instrument panel, and then disconnect the high voltage after a set delay below the safe stopping speed, ultimately causing the vehicle to cease operation.

[0003] Currently, high-voltage power distribution solutions primarily utilize an independent pre-charge circuit to power the main drive, while the remaining auxiliary drives and high-voltage distribution utilize a single pre-charge circuit to power the vehicle's auxiliary drives and the remaining high-voltage load circuits. After all relays are energized, the positive and negative high-voltage poles each form a single main circuit. When an insulation fault occurs at any high-voltage node and is detected by the vehicle, the common solution is to stop the vehicle and prohibit operation. The vehicle status changes from READY to STOP, and high voltage is not allowed. This can cause the vehicle to become stranded, requiring it to be transported to a 4S dealership or repair station by a tow truck for repair. Normal operation can only resume after the insulation fault is completely resolved. This approach not only causes significant inconvenience to users, increases repair costs and time, but also affects vehicle efficiency. Summary of the Invention

[0004] In response to the problems in the prior art, the present invention provides an insulation confirmation device for vehicle parts based on an insulation detection unit.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for confirming the insulation of a vehicle high-voltage circuit based on an insulation detection unit, comprising: when the vehicle detects an insulation fault, the vehicle insulation detection unit monitors the insulation resistance values ​​of the positive and negative electrodes of the high-voltage system in real time, and when it is determined that the insulation resistance is lower than a preset threshold, the battery main circuit relay is disconnected and the initial fault information is stored under preset safety conditions; Determine the type of insulation fault through the insulation detection unit and isolate each high-voltage circuit one by one based on the fault type, including: if the positive insulation is abnormal, disconnect the positive relay of each high-voltage circuit one by one to detect whether the fault disappears to locate the fault circuit; If the negative pole insulation is abnormal, disconnect the negative pole relays of each high-voltage circuit one by one to check whether the fault disappears to locate the fault circuit; If both the positive and negative insulation are abnormal, perform the positive and negative insulation abnormality troubleshooting process in sequence; Isolate the faulty circuit found and store the fault information. If the faulty circuit is a non-critical high-voltage circuit, keep the vehicle's power system activated and allow the vehicle to continue driving. If the faulty circuit is a critical high-voltage circuit, the vehicle safety shutdown process is triggered; Key high-voltage circuits include: Power drive circuit: the circuit that drives the vehicle, such as the main motor and DC / AC module; Brake circuit: high-pressure components of the brake system; Steering circuit: high-voltage components of the steering system; If the vehicle continues to run, the system monitors the status of the fault circuit in real time; when the vehicle is restarted after a shutdown, the fault circuit is automatically isolated based on the stored fault information, and the corresponding function restrictions are prompted through the human-computer interaction interface; When the vehicle is restarted, the fault circuit is automatically isolated based on the stored fault information, and the corresponding function restrictions are prompted through the human-computer interaction interface; Supports reading and clearing stored fault information through external devices to guide fault troubleshooting and repair.

[0006] Specifically, the preset safety conditions include: the vehicle speed is lower than a preset safety threshold; The vehicle is in a non-charging state; The insulation fault did not trigger the emergency stop signal.

[0007] Specifically, the process of isolating each high-voltage circuit one by one includes: disconnecting the relays of each high-voltage circuit in sequence according to a preset order, and performing insulation value detection at a preset time interval after each disconnection; Verify the disconnected circuit relays by closing and closing them one by one to eliminate misjudgment and accurately locate the fault point; When it is detected that the insulation fault disappears, the currently disconnected circuit is locked as a suspected fault circuit.

[0008] Specifically, it is used to monitor the insulation value of the positive and negative poles of the vehicle's high-voltage system in real time and generate insulation fault type signals; Circuit control unit: connected to the battery main circuit relay and each high-voltage circuit relay, according to the insulation fault type signal, it controls the relay on and off in sequence according to the preset logic to achieve isolation and verification of the high-voltage circuit; Fault management unit: stores insulation fault information and troubleshooting results; Output power system activation signal or safety shutdown signal according to the critical / non-critical type of the fault circuit; Human-computer interaction unit: used to display the function limitation information and maintenance instructions corresponding to the fault circuit; Communication interface unit: supports communication with external diagnostic equipment to read and clear fault information.

[0009] Specifically, the preset logic includes: Prioritize checking non-critical high-voltage circuits, and then check critical high-voltage circuits; Verify the insulation fault detection results of the same circuit multiple times; Adjust the relay on-off time interval according to the circuit load characteristics.

[0010] Specifically, the insulation confirmation device; A high-voltage power distribution system, including a battery main circuit relay and at least one high-voltage load circuit relay; Onboard controller that executes insulation troubleshooting logic and communicates with the insulation verification device.

[0011] Specifically, at least one of a power drive circuit, an auxiliary power supply circuit, a thermal management circuit, and a body equipment circuit.

[0012] Specifically, the storage medium stores a computer program, and when the program is executed by a processor, any one of the insulation confirmation methods is implemented.

[0013] Beneficial effects of the present invention: (1) The present invention controls the relay to disconnect / close successively through software, and combines it with the real-time feedback of the insulation detection unit to locate the insulation fault to a specific circuit instead of checking the entire vehicle. During maintenance, the wiring harness or component can be directly inspected on the stored fault branch, avoiding blind disassembly and inspection, shortening maintenance time, and reducing labor costs.

[0014] (2) The present invention implements fault isolation instead of vehicle shutdown for insulation faults in non-critical high-voltage circuits. After disconnecting the fault circuit relay, the READY light of the vehicle remains on, allowing the vehicle to continue driving, thus avoiding vehicle breakdown due to non-critical functional failures and improving vehicle utilization.

[0015] (3) The fault circuit information is stored in the EE memory area. When the vehicle is restarted, the stored fault circuit relay is automatically disconnected, and the instrument prompt function is limited to prevent the secondary insulation risk caused by the power supply of the fault circuit during restart. At the same time, the human-computer interaction interface guides users to prioritize the handling of key faults to improve operational safety.

[0016] (4) Clearly distinguish between critical high-voltage circuits and non-critical circuits, implement safe shutdown for the former, and allow the latter to continue driving. Under the premise of ensuring driving safety, the basic functions of the vehicle are retained to the maximum extent possible to achieve a balance between safety and practicality. Main circuit relay BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1This is the electrical principle diagram provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figure 1 As shown, the present invention provides the following technical solutions: Figure 1 As shown, the battery output positive relay is MC0+, and the motor negative output relay is MC0-; the insulation tester monitoring point is located at the rear end of MC0+ and MC0- for insulation detection; MC1+ is the main circuit relay, MC2+ is the main drive circuit pre-charge contactor, MC3+ is the secondary circuit main contactor, and MC4+ is the secondary circuit pre-charge contactor; MC5+ is the auxiliary drive brake circuit positive relay, used for insulation fault confirmation, and the normal state is normally closed. MC5- is the auxiliary drive brake circuit negative relay, used for insulation fault confirmation, and the normal state is normally closed. MC6+ is the auxiliary drive steering circuit positive relay, used for insulation fault confirmation, and the normal state is normally closed. MC6- is the auxiliary drive steering circuit negative relay. The relay is used to confirm insulation faults and is normally closed. MC7+ is the positive relay for the DCDC circuit and is used to confirm insulation faults. It is normally closed. MC7- is the negative relay for the DCDC circuit and is used to confirm insulation faults. It is normally closed. MC8+ is the positive relay for the electric heating circuit and is used to confirm insulation faults. It is normally closed. MC8- is the negative relay for the electric heating circuit and is used to confirm insulation faults. It is normally closed. MC9+ is the positive relay for the air conditioning circuit and is used to confirm insulation faults. It is normally closed. MC9- is the negative relay for the air conditioning circuit and is used to confirm insulation faults. It is normally closed. After an insulation fault occurs, the working logic of the self-detection device is as follows: (1) The insulation detection module confirms the insulation fault; (2) Report low positive insulation or low negative insulation or positive or negative insulation faults; (3) According to the reported fault software, the circuit device is controlled, the circuit relay is disconnected and the insulation is checked to see if it is normal; (4) Obtain the real-time relay status and store the insulation fault of the circuit; (5) Determine whether it is a critical high-voltage circuit insulation fault; (6) Insulation fault protection.

[0021] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for confirming the insulation of a vehicle high-voltage circuit based on an insulation detection unit, characterized in that: include: When the vehicle detects an insulation fault, the vehicle insulation detection unit monitors the insulation resistance of the positive and negative electrodes of the high-voltage system in real time. When it determines that the insulation resistance is lower than the preset threshold, it disconnects the battery main circuit relay and stores the initial fault information under the preset safety conditions. Determine the type of insulation fault through the insulation detection unit and isolate each high-voltage circuit one by one based on the fault type, including: if the positive insulation is abnormal, disconnect the positive relay of each high-voltage circuit one by one to detect whether the fault disappears to locate the fault circuit; If the negative pole insulation is abnormal, disconnect the negative pole relays of each high-voltage circuit one by one to check whether the fault disappears to locate the fault circuit; If both the positive and negative insulation are abnormal, perform the positive and negative insulation abnormality troubleshooting process in sequence; Isolate the faulty circuit found and store the fault information. If the faulty circuit is a non-critical high-voltage circuit, keep the vehicle's power system activated and allow the vehicle to continue driving. If the faulty circuit is a critical high-voltage circuit, the vehicle safety shutdown process is triggered; If the vehicle continues to run, the system monitors the status of the fault circuit in real time; when the vehicle is restarted after a shutdown, the fault circuit is automatically isolated based on the stored fault information, and the corresponding function restrictions are prompted through the human-computer interaction interface; When the vehicle is restarted, the fault circuit is automatically isolated based on the stored fault information, and the corresponding function restrictions are prompted through the human-computer interaction interface; Read and clear stored fault information to guide fault detection and repair.

2. The method according to claim 1, wherein The preset safety conditions include: the vehicle speed is lower than a preset safety threshold; The vehicle is in a non-charging state; The insulation fault did not trigger the emergency stop signal.

3. The method according to claim 1, wherein The process of isolating each high-voltage circuit one by one includes: disconnecting the relays of each high-voltage circuit in sequence according to a preset order, and performing insulation value detection at a preset interval after each disconnection; Verify the disconnected circuit relays by closing and closing them one by one to eliminate misjudgment and accurately locate the fault point; When it is detected that the insulation fault disappears, the currently disconnected circuit is locked as a suspected fault circuit.

4. A vehicle insulation confirmation device, characterized in that: include: Insulation detection unit: used to monitor the positive and negative insulation values ​​of the vehicle's high-voltage system in real time and generate insulation fault type signals; Circuit control unit: connected to the battery main circuit relay and each high-voltage circuit relay, according to the insulation fault type signal, it controls the relay on and off in sequence according to the preset logic to achieve isolation and verification of the high-voltage circuit; Fault management unit: stores insulation fault information and troubleshooting results; Output power system activation signal or safety shutdown signal according to the critical / non-critical type of the fault circuit; Human-computer interaction unit: used to display the function limitation information and maintenance instructions corresponding to the fault circuit; Communication interface unit: supports communication with external diagnostic equipment to read and clear fault information.

5. The device according to claim 4, characterized in that The preset logic includes: Prioritize checking non-critical high-voltage circuits, and then check critical high-voltage circuits; Verify the insulation fault detection results of the same circuit multiple times; Adjust the relay on-off time interval according to the circuit load characteristics.

6. A new energy vehicle insulation confirmation device, characterized in that: include: The insulation confirmation device according to any one of claims 4 to 5; A high-voltage power distribution system, including a battery main circuit relay and at least one high-voltage load circuit relay; Onboard controller that executes insulation troubleshooting logic and communicates with the insulation verification device.

7. The device according to claim 6, characterized in that The high-voltage load circuit includes at least one of a power drive circuit, an auxiliary power supply circuit, a thermal management circuit, and a body equipment circuit.

8. A computer-readable storage medium, characterized in that The storage medium stores a computer program. When the program is executed by the processor, the insulation confirmation method according to any one of claims 1 to 3 is implemented, that is, if the positive pole insulation is abnormal, the positive pole relays of each high-voltage circuit are disconnected one by one, and it is detected whether the fault disappears to locate the fault circuit; if the negative pole insulation is abnormal, the negative pole relays of each high-voltage circuit are disconnected one by one, and it is detected whether the fault disappears to locate the fault circuit.

Images