Whole vehicle high-voltage loop insulation detection method, equipment, device, medium and vehicle

Abstract

The invention discloses a finished automobile high-voltage loop insulation detection method, equipment and device, a storage medium and a vehicle, and the method comprises the steps: disconnecting a first relay group of any target automobile assembly, and obtaining a first positive electrode ground insulation resistance value of a first sampling point and a first negative electrode ground insulation resistance value of a second sampling point; when the first positive electrode ground insulation resistance value or the first negative electrode ground insulation resistance value is smaller than a preset threshold value, it is determined that the target automobile assembly is in an insulation failure state; when the first positive electrode ground insulation resistance value is greater than or equal to the preset threshold value and the first negative electrode ground insulation resistance value is greater than or equal to the preset threshold value, disconnecting a second relay group of the high-voltage distribution box assembly, and obtaining a second positive electrode ground insulation resistance value of the first sampling point and a second negative electrode ground insulation resistance value of the second sampling point; and when the second positive electrode ground insulation resistance value or the second negative electrode ground insulation resistance value is smaller than a preset threshold value, determining that the high-voltage wire harness is in an insulation failure state. The method can be widely applied to the technical field of automobile control.

Description

Technical Field

[0001] The present invention relates to the field of automobile control technology, and in particular to a whole vehicle high voltage circuit insulation detection method, system, device, storage medium and vehicle. Background Art

[0002] With the rapid development of the new energy vehicle industry, users are paying more and more attention to the safety performance of the vehicle body, among which the most widely concerned point is the insulation performance. New energy vehicles integrate multiple high-voltage assemblies, such as power batteries, drive motors, high-voltage wiring harnesses, etc. After these high-voltage assemblies experience high temperature, vibration or humidity and other working conditions, the insulation materials may face the risk of insulation failure, thereby causing insulation failure. For the location and troubleshooting of insulation failure problems in automobiles, the current main method used is manual segmented troubleshooting and one-by-one measurement, which requires a lot of manpower and material resources for on-site inspection, increasing the corresponding costs. Therefore, there are still technical problems that need to be solved in related technologies. Summary of the invention

[0003] The purpose of the present invention is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] To this end, an object of an embodiment of the present invention is to provide a method, equipment, device, storage medium and vehicle for detecting insulation of a whole vehicle high-voltage circuit, which can reduce the cost of eliminating insulation faults in an automobile.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the present invention includes: a vehicle high-voltage circuit insulation detection method, the vehicle high-voltage circuit includes a high-voltage wiring harness, a high-voltage distribution box assembly and a plurality of target vehicle assemblies, each of the target vehicle assemblies is connected to the high-voltage distribution box assembly through a high-voltage wiring harness, the detection method includes: determining that the vehicle is in a dormant state, disconnecting the first relay group of any one of the target vehicle assemblies, and obtaining the first positive electrode insulation resistance to ground at the first sampling point and the first negative electrode insulation resistance to ground at the second sampling point; when the first positive electrode insulation resistance to ground or the first negative electrode insulation resistance to ground is When the first negative pole-to-ground insulation resistance is less than a preset threshold, it is determined that the target vehicle assembly is in an insulation failure state; when the first positive pole-to-ground insulation resistance is greater than or equal to the preset threshold, and the first negative pole-to-ground insulation resistance is greater than or equal to the preset threshold, the second relay group of the high-voltage distribution box assembly is disconnected, and the second positive pole-to-ground insulation resistance of the first sampling point and the second negative pole-to-ground insulation resistance of the second sampling point are obtained; when the second positive pole-to-ground insulation resistance or the second negative pole-to-ground insulation resistance is less than the preset threshold, it is determined that the high-voltage wiring harness is in an insulation failure state.

[0006] In addition, the method for detecting the insulation of a vehicle high-voltage circuit according to the above embodiment of the present invention may also have the following additional technical features:

[0007] Furthermore, in an embodiment of the present invention, the vehicle high-voltage circuit further includes a power battery assembly, and the method further includes:

[0008] Determine that the vehicle is in a charging condition, close the third relay group of the power battery assembly, and obtain the third positive electrode-to-ground insulation resistance value at the third sampling point and the third negative electrode-to-ground insulation resistance value at the fourth sampling point;

[0009] When the insulation resistance of the third positive electrode to the ground or the insulation resistance of the third negative electrode to the ground is less than the preset threshold, it is determined that the charging circuit is in an insulation failure state.

[0010] Further, in an embodiment of the present invention, the method further includes: when the insulation resistance of the third positive electrode to the ground is greater than or equal to the preset threshold, and the insulation resistance of the third negative electrode to the ground is greater than or equal to the preset threshold, determining that the high-voltage component of the vehicle is in an insulation failure fault state;

[0011] Alternatively, when the third positive electrode-to-ground insulation resistance is greater than or equal to the preset threshold, and the third negative electrode-to-ground insulation resistance is greater than or equal to the preset threshold, it is determined that the insulation failure fault state is caused by an external device.

[0012] Furthermore, in an embodiment of the present invention, the method further includes: when the insulation resistance of the first positive electrode to the ground is greater than or equal to the preset threshold, and the insulation resistance of the first negative electrode to the ground is greater than or equal to the preset threshold, determining that the target vehicle assembly is in an effective insulation state.

[0013] Furthermore, in an embodiment of the present invention, the method further includes: when the insulation resistance of the second positive pole to the ground is greater than or equal to the preset threshold, or the insulation resistance of the second negative pole to the ground is greater than or equal to the preset threshold, determining that the high-voltage wiring harness is in an effective insulation state.

[0014] Furthermore, in an embodiment of the present invention, the first relay group and the second relay group each include two relays; and the relays are in a normally closed state after the entire vehicle enters the dormant state.

[0015] On the other hand, an embodiment of the present invention further provides a vehicle high-voltage circuit insulation detection device, wherein the vehicle high-voltage circuit includes a high-voltage wire harness, a high-voltage distribution box assembly, and a plurality of target vehicle assemblies, each of the target vehicle assemblies is connected to the high-voltage distribution box assembly via a high-voltage wire harness, and the detection device includes:

[0016] A first processing unit is used to determine that the whole vehicle is in a dormant state, disconnect the first relay group of any one of the target vehicle assemblies, and obtain the first positive electrode-to-ground insulation resistance value of the first sampling point and the first negative electrode-to-ground insulation resistance value of the second sampling point;

[0017] The second processing unit is used to determine that the target vehicle assembly is in an insulation failure state when the first positive electrode-to-ground insulation resistance or the first negative electrode-to-ground insulation resistance is less than a preset threshold value; or, when the first positive electrode-to-ground insulation resistance is greater than or equal to the preset threshold value, and the first negative electrode-to-ground insulation resistance is greater than or equal to the preset threshold value, disconnect the second relay group of the high-voltage distribution box assembly, and obtain the second positive electrode-to-ground insulation resistance of the first sampling point and the second negative electrode-to-ground insulation resistance of the second sampling point; when the second positive electrode-to-ground insulation resistance or the second negative electrode-to-ground insulation resistance is less than the preset threshold value, determine that the high-voltage wiring harness is in an insulation failure state.

[0018] On the other hand, the present invention also provides a vehicle high-voltage circuit insulation detection device, comprising:

[0019] at least one processor;

[0020] at least one memory for storing at least one program;

[0021] When the at least one program is executed by the at least one processor, the at least one processor implements the vehicle high-voltage circuit insulation detection method as described above.

[0022] In addition, the present invention also provides a storage medium, in which processor-executable instructions are stored. When the processor-executable instructions are executed by the processor, they are used to execute the vehicle high-voltage circuit insulation detection method as described above.

[0023] In addition, the present invention also provides a vehicle, comprising the vehicle high-voltage circuit insulation detection equipment as described above or the vehicle high-voltage circuit insulation detection device as described above.

[0024] The advantages and beneficial effects of the present invention will be partly given in the following description, partly become apparent from the following description, or be understood through the practice of the present invention:

[0025] The whole vehicle high-voltage circuit of the present invention includes a high-voltage wiring harness, a high-voltage distribution box assembly and a plurality of target automobile assemblies, each target automobile assembly is connected to the high-voltage distribution box assembly through the high-voltage wiring harness, and the detection method is that when the whole vehicle is in a dormant state, the processor collects the first positive electrode-to-ground insulation resistance of the first sampling point and the first negative electrode-to-ground insulation resistance of the second sampling point by closing the relay group. When the first positive electrode-to-ground insulation resistance is less than a preset threshold or the first negative electrode-to-ground insulation resistance is less than the preset threshold, it is determined that the target automobile assembly is in an insulation failure state. After determining that the first positive electrode-to-ground insulation resistance is greater than or equal to the preset threshold, and the first negative electrode-to-ground insulation resistance is greater than or equal to the preset threshold, the processor can disconnect the second relay group of the high-voltage distribution box assembly, and obtain the second positive electrode-to-ground insulation resistance of the first sampling point and the second negative electrode-to-ground insulation resistance of the second sampling point; when the second positive electrode-to-ground insulation resistance or the second negative electrode-to-ground insulation resistance is less than the preset threshold, it is determined that the high-voltage wiring harness is in an insulation failure state. The present invention can detect insulation faults and insulation failures and locate faulty components by detecting the insulation resistance of the positive electrode to the ground and the insulation resistance of the negative electrode to the ground. The present invention can improve the efficiency of insulation fault troubleshooting and reduce the cost of insulation fault troubleshooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a high-voltage circuit of a whole vehicle in a specific embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in a specific embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in another specific embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in another specific embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in another specific embodiment of the present invention;

[0031] Figure 6 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in another specific embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the steps of a vehicle high-voltage circuit insulation detection method in another specific embodiment of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a high-voltage circuit of a whole vehicle in another specific embodiment of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of a vehicle high-voltage circuit insulation detection device in a specific embodiment of the present invention;

[0035] Fig.10 It is a schematic structural diagram of a vehicle high-voltage circuit insulation detection device in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings to explain the principles and processes of the vehicle high-voltage circuit insulation detection method, system, device, storage medium and vehicle in the embodiments of the present invention.

[0037] First, the terms used in the present invention are explained.

[0038] Insulation failure refers to a problem with the insulation performance in a circuit system, which causes current to flow in a path where it should not flow, which may cause safety hazards such as leakage and short circuit. Insulation failures in new energy vehicles can be divided into leakage or reduced resistance, single-point and multi-point failures. Leakage or reduced resistance: There is leakage or reduced resistance in the line between the positive and negative poles of the high-voltage battery and the electric chassis, usually due to leakage of electrolyte inside the battery. Single-point and multi-point failures: Single-point insulation failure will not have a significant impact on the system for the time being, but multi-point insulation failure may cause a fire.

[0039] The causes of insulation failure can be divided into leakage of electrolyte inside the battery, dampness or manufacturing defects of the transformer, aging of insulating materials, and voltage increase. Leakage of electrolyte inside the battery: In new energy vehicles, leakage of electrolyte inside the battery will corrode the insulation layer and form a conductive loop, thereby causing insulation failure. Dampness or manufacturing defects of the transformer: Dampness of the transformer will cause the insulation performance to deteriorate, while manufacturing quality defects or overvoltage shocks during operation may cause insulation breakdown. Aging of insulating materials: Insulating materials in contact with the heating components of electrical conductors or magnetic conductors fail due to overheating and aging, resulting in reduced insulation performance. Voltage increase: In power cables, when the voltage rises to a certain range, it may instantly break through the insulator, causing a flashover failure.

[0040] Next, necessary description is given to the prior art related to the present invention.

[0041] With the rapid development of the new energy vehicle industry, users are paying more and more attention to the safety performance of the vehicle body, among which the most widely concerned point is the insulation performance. New energy vehicles integrate multiple high-voltage assemblies, such as power batteries, drive motors, and high-voltage wiring harnesses. After experiencing high temperature, vibration, humidity and other working conditions, the insulation materials of these assemblies may face the risk of insulation failure, thereby causing insulation failure. For the location and troubleshooting of insulation failure problems in automobiles, the current main method used is manual segmented troubleshooting and one-by-one measurement, which requires a lot of manpower and material resources for on-site inspection, increasing the corresponding costs. Therefore, there are still technical problems that need to be solved in related technologies.

[0042] In view of the above technical problems, the present invention can provide a vehicle high voltage circuit insulation detection method. The detection method can be used to troubleshoot the insulation fault of the vehicle high voltage circuit. Figure 1 , the vehicle high-voltage circuit may include a power battery assembly 1, an insulation detection system 2, a high-voltage distribution box assembly 3, a domain control system 4 and several target vehicle assemblies 5. The target vehicle assembly 5 may be any vehicle assembly that requires high-voltage drive in a car. The vehicle assembly may be assembled from a number of parts, components, assemblies or accessories, and may be a component of a car with independent functions. Generally, a car has five major assemblies, namely, a steering gear assembly, an engine assembly, a transmission assembly, front and rear axles and a frame. The steering gear assembly is a very important component in the vehicle steering system. Its function is to increase the force transmitted from the steering wheel to the steering transmission mechanism, and at the same time, it can change the direction of force transmission. The engine assembly is an assembly that can convert electrical energy into mechanical energy. The transmission assembly is actually a gearbox, and its main function is to change the engine speed and torque mechanism. The transmission assembly can generally be composed of two parts: an operating mechanism and a speed transmission mechanism. Nowadays, some vehicles also have a power output mechanism. The front and rear axle assemblies can represent the front and rear axles of the vehicle; the frame assembly is a frame structure that spans the front and rear axles of the vehicle, and it belongs to the base of the vehicle.

[0043] exist Figure 1 In the embodiment, the insulation detection system 2 can be integrated inside the battery pack, that is, it can be integrated into a subsystem with the power battery assembly 1. The power battery assembly 1 can be connected to the high-voltage distribution box assembly 3. The high-voltage distribution box assembly 3 can be connected to several target assemblies at the same time. The high-voltage distribution box assembly 3 can include multiple second relay groups. The specific number of the second relay groups can be the same as the number of the target vehicle assembly 5. Each second relay group can be composed of two relays, such as Figure 1 Relay K7 and relay K8, or relay K9 and relay K10. One of the two relays can be set on the positive line of the high-voltage distribution box, such as Figure 1 Relay K8, another relay can be set in the negative line of the high voltage distribution box, such as Figure 1 Any target vehicle assembly 5 may also be provided with a first relay group. Similarly, the first relay group may also be composed of two relays, such as Figure 1 Relay K11 and relay K12, or relay K13 and relay K14. Any relay group set in the high-voltage distribution box assembly 3 is electrically connected to the relay group of the target vehicle assembly 5 through a high-voltage wiring harness. Specifically, Figure 1 In the embodiment, the high-voltage distribution box assembly 3 is connected to a target vehicle assembly 5 through the relay K8, the high-voltage positive line, the relay K12, the relay K7, the high-voltage negative line and the relay K11.

[0044] The domain control system 4 can receive the detection signal of the insulation detection system 2, and control the vehicle instrument to send different fault alarm information through the detection signal. The domain control system 4 can also send control signals to the high-voltage distribution box assembly 3 and all target vehicle assemblies 5 to control the opening and closing of the relay groups of the high-voltage distribution box assembly 3 and the target vehicle assembly 5. In some embodiments of the present application, the relays of the first relay group and the second relay group are normally closed relays, which are in a normally closed state after the vehicle enters a dormant state. Figure 1 In the embodiment, the power battery assembly 1 may include at least four relays K1-K4, and the relay K1 and the relay K2 constitute the third relay group of the present application. Among them, the relays K1 and K2 can control the connection and disconnection of the positive and negative lines of the power battery assembly 1 during charging. And the relays K3 and K4 can control the connection and disconnection of the positive and negative lines of the power battery assembly 1 during output. The first sampling point can be any point on the high-voltage positive line between the target vehicle assembly 5 and the high-voltage distribution box assembly 3, such as Figure 1 The second sampling point can be any point on the high-voltage negative line between the target vehicle assembly 5 and the high-voltage distribution box assembly 3, such as Figure 1 The third sampling point can be any point on the positive line connecting the power battery assembly 1 and the external charging device, such as Figure 1 The fourth sampling point may be any point on the negative electrode line connecting the power battery assembly 1 and the external charging device; Figure 1 The sampling point D1 in .

[0045] Reference Figure 2 , Figure 2 Schematic diagram of the steps of the vehicle high voltage circuit insulation detection method in the present invention. Figure 2 In the present invention, the vehicle high-voltage circuit insulation detection method may include but is not limited to step S101 and step S102, or step S101 and step S103.

[0046] S101, determining that the entire vehicle is in a dormant state, disconnecting a first relay group of any target vehicle assembly, and obtaining a first positive electrode-to-ground insulation resistance value at a first sampling point and a first negative electrode-to-ground insulation resistance value at a second sampling point.

[0047] S102: When the insulation resistance of the first positive electrode to the ground or the insulation resistance of the first negative electrode to the ground is less than a preset threshold, it is determined that the target vehicle assembly is in an insulation failure state.

[0048] S103. When the first positive pole-to-ground insulation resistance is greater than or equal to a preset threshold value, and the first negative pole-to-ground insulation resistance is greater than or equal to a preset threshold value, disconnect the second relay group of the high-voltage distribution box assembly, and obtain the second positive pole-to-ground insulation resistance of the first sampling point and the second negative pole-to-ground insulation resistance of the second sampling point; when the second positive pole-to-ground insulation resistance or the second negative pole-to-ground insulation resistance is less than the preset threshold value, determine that the high-voltage wiring harness is in an insulation failure state.

[0049] In some feasible embodiments of the present invention, the processor or domain control system may first determine that the entire vehicle is in a dormant state. After determining that the vehicle enters the dormant state, the processor or domain control system may disconnect the first relay group of any target vehicle assembly, and simultaneously start to obtain the first positive pole-to-ground insulation resistance of the first sampling point and the first negative pole-to-ground insulation resistance of the second sampling point. When the first positive pole-to-ground insulation resistance or the first negative pole-to-ground insulation resistance is less than a preset threshold, the processor or domain control system may determine that the target vehicle assembly is in an insulation failure state. When the first positive pole-to-ground insulation resistance is greater than or equal to the preset threshold, and the first negative pole-to-ground insulation resistance is greater than or equal to the preset threshold, the second relay group of the high-voltage distribution box assembly is disconnected, and the second positive pole-to-ground insulation resistance of the first sampling point and the second negative pole-to-ground insulation resistance of the second sampling point are obtained; when the second positive pole-to-ground insulation resistance or the second negative pole-to-ground insulation resistance is less than the preset threshold, it is determined that the high-voltage wiring harness is in an insulation failure state.

[0050] It can be understood that the first positive electrode insulation resistance to ground and the second positive electrode insulation resistance to ground are two resistance values ​​of the same sampling point before and after the second relay group of the high-voltage distribution box assembly is disconnected. The first negative electrode insulation resistance to ground and the second negative electrode insulation resistance to ground are two resistance values ​​of the same sampling point before and after the second relay group of the high-voltage distribution box assembly is disconnected. The first positive electrode insulation resistance to ground, the first negative electrode insulation resistance to ground, the second positive electrode insulation resistance to ground and the second negative electrode insulation resistance to ground can all be detected by the resistance detection device or the insulation detection system. The resistance detection device can also be a sub-device of the insulation detection system, and the resistance detection device or the insulation detection system can also be connected to the processor by wire or wireless communication. Or the resistance detection device or the insulation detection system can also be connected to the domain control system by wire or wireless communication. The two faults of the target automobile assembly being in an insulation failure state or the high-voltage wiring harness being in an insulation failure state can be displayed on the vehicle instrument to remind the user. The preset threshold value can be any resistance value, and its specific resistance value can be determined by the designer as needed.

[0051] It should be noted that the above-mentioned wired connection method may include a connection between a mobile device and a processing module, and may also include a connection between a processing module and a hardware device, as well as a wired connection between other devices currently known or to be developed in the future and the processing module; and the above-mentioned wireless connection method may include but is not limited to 3G / 4G / 5G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (Ultra Wide Band) connection, and other wireless connection methods currently known or to be developed in the future.

[0052] The vehicle high-voltage circuit of the present invention includes a high-voltage wiring harness, a high-voltage distribution box assembly and a plurality of target vehicle assemblies. Each target vehicle assembly is connected to the high-voltage distribution box assembly through a high-voltage wiring harness. The detection method is that when the vehicle is in a dormant state, the processor collects the insulation resistance of the first positive electrode to the ground at the first sampling point and the insulation resistance of the first negative electrode to the ground at the second sampling point by closing the relay group. When the insulation resistance of the first positive electrode to the ground is less than a preset threshold or the insulation resistance of the first negative electrode to the ground is less than a preset threshold, it is determined that the target vehicle assembly is in an insulation failure state. After determining that the insulation resistance of the first positive electrode to the ground is greater than or equal to the preset threshold, and the insulation resistance of the first negative electrode to the ground is greater than or equal to the preset threshold, the processor can disconnect the second relay group of the high-voltage distribution box assembly, and obtain the insulation resistance of the second positive electrode to the ground at the first sampling point and the insulation resistance of the second negative electrode to the ground at the second sampling point; when the insulation resistance of the second positive electrode to the ground or the insulation resistance of the second negative electrode to the ground is less than the preset threshold, it is determined that the high-voltage wiring harness is in an insulation failure state. The present invention can detect insulation faults and insulation failures and locate faulty components by detecting the insulation resistance of the positive electrode to the ground and the insulation resistance of the negative electrode to the ground. The present invention can improve the efficiency of insulation fault troubleshooting and reduce the cost of insulation fault troubleshooting.

[0053] Further, refer to Figure 3 The testing method may further include step S104 and step S105.

[0054] S104, determining that the vehicle is in a charging condition, closing the third relay group of the power battery assembly, and obtaining the insulation resistance value of the third positive electrode to the ground at the third sampling point and the insulation resistance value of the third negative electrode to the ground at the fourth sampling point.

[0055] S105: When the insulation resistance of the third positive electrode to the ground or the insulation resistance of the third negative electrode to the ground is less than a preset threshold, it is determined that the charging circuit is in an insulation failure state.

[0056] In some feasible embodiments of the present invention, the processor or domain control system may first determine that the vehicle is in a charging condition. After determining that the vehicle is in a charging condition, the processor or domain control system may close the third relay group of the power battery assembly, and at the same time, the processor or domain control system may obtain the third positive electrode-to-ground insulation resistance of the third sampling point and the third negative electrode-to-ground insulation resistance of the fourth sampling point. When the third positive electrode-to-ground insulation resistance or the third negative electrode-to-ground insulation resistance is less than a preset threshold, it is determined that the charging circuit is in an insulation failure state.

[0057] Further, refer to Figure 4 and Figure 5 The testing method may further include step S106 or step S107.

[0058] S106. When the insulation resistance of the third positive electrode to the ground is greater than or equal to a preset threshold, and the insulation resistance of the third negative electrode to the ground is greater than or equal to a preset threshold, it is determined that the high-voltage component of the vehicle is in an insulation failure fault state.

[0059] or,

[0060] S107: When the insulation resistance of the third positive electrode to the ground is greater than or equal to a preset threshold, and the insulation resistance of the third negative electrode to the ground is greater than or equal to a preset threshold, it is determined that the insulation failure fault state is caused by an external device.

[0061] In some feasible embodiments of the present invention, when the insulation resistance of the third positive pole to the ground is greater than or equal to a preset threshold, and the insulation resistance of the third negative pole to the ground is greater than or equal to a preset threshold, the processor or domain control system can determine that the high-voltage component of the vehicle is in an insulation failure fault state. Alternatively, when the insulation resistance of the third positive pole to the ground is greater than or equal to a preset threshold, and the insulation resistance of the third negative pole to the ground is greater than or equal to a preset threshold, the processor or domain control system can determine that the insulation failure fault state is caused by an external device. Two different situations require further interpretation and confirmation.

[0062] Further, refer to Figure 6 The testing method may further include step S108.

[0063] S108. When the insulation resistance of the first positive electrode to the ground is greater than or equal to a preset threshold, and the insulation resistance of the first negative electrode to the ground is greater than or equal to a preset threshold, it is determined that the target vehicle assembly is in an effective insulation state.

[0064] In some feasible embodiments of the present invention, when the insulation resistance of the first positive pole to the ground is greater than or equal to a preset threshold, and the insulation resistance of the first negative pole to the ground is greater than or equal to a preset threshold, the processor or domain control system can determine that the target vehicle assembly is in an effective insulation state.

[0065] Further, refer to Figure 7 , the testing method may further include step S109.

[0066] S109: When the insulation resistance of the second positive electrode to the ground is greater than or equal to a preset threshold, or the insulation resistance of the second negative electrode to the ground is greater than or equal to a preset threshold, it is determined that the high-voltage wiring harness is in an effective insulation state.

[0067] In some feasible embodiments of the present invention, when the insulation resistance of the second positive pole to the ground is greater than or equal to a preset threshold, or the insulation resistance of the second negative pole to the ground is greater than or equal to a preset threshold, the processor or domain control system can determine that the high-voltage wiring harness is in an effective insulation state.

[0068] The specific implementation principle of the present invention is described below in conjunction with the accompanying drawings:

[0069] Reference Figure 8 When an insulation fault occurs in a car, the instrument panel of the whole vehicle can prompt the user "the whole vehicle insulation fault, please go to the 4S shop for processing". The 4S shop staff will flash the corresponding insulation detection program to the domain controller to put the whole vehicle into a power-off dormant state. At the same time, the domain controller will input the disconnection command of the normally closed relays K14 and K13 to one of the assemblies. At this time, the insulation detection system will take a new positive electrode to ground insulation resistance R at the sampling point D3. D3 , take a new positive electrode to ground insulation resistance R at sampling point D4 D4 The insulation resistance value taken is calculated to obtain the new resistance value R D3 , R D4 Compare with the threshold and report to the domain controller. D3 , R D4 If any resistance value in is less than the preset threshold, the reporting signal = 1. D3 , R D4 If it is greater than or equal to the preset threshold, the reporting signal = 0, and the domain controller displays the instrument alarm according to 0 or 1. If the reporting signal = 0, the instrument does not display the insulation fault problem at this time, then it is determined that the corresponding assembly is in an insulation failure state. If the reporting signal = 1, the instrument still reports the insulation problem, then the domain controller continues to input the normally closed relay K10, K9 disconnect command, and the insulation detection system will take the new positive electrode to ground insulation resistance R at sampling points 3 and 4. D31 And the insulation resistance of the negative pole to the ground R D41 , the insulation resistance value taken is calculated to get the new resistance value R D31 , R D41 Compare with the preset threshold, and convert the comparison result into different signals and report them to the domain controller. D31 , R D41 If both are greater than or equal to the preset threshold, the reporting signal = 0. The instrument does not report an insulation problem at this time, then it is determined that the high-voltage wiring harness insulation between assembly 2 and the high-voltage distribution box assembly has failed; if the instrument still reports an insulation problem at this time, repeat the above operation until the specific assembly is found and located.

[0070] When the vehicle is in the charging state and an insulation fault occurs, the instrument prompts the user to go to the 4S shop for processing. The 4S electrician will flash the corresponding insulation detection program to the domain control system, so that the high-voltage assemblies of the vehicle are in a dormant state, which can ensure the accuracy of the insulation resistance detection of the detection system. At the same time, the charging relays K1 and K2 are energized one by one through the domain control system, and new insulation resistance values ​​are taken at the sampling points one by one and calculated for troubleshooting and positioning.

[0071] When an insulation fault occurs, the instrument prompts the user "Insulation fault of the whole vehicle, please go to the 4S shop for processing". The 4S shop staff flashes the corresponding insulation detection program to the domain controller to make the whole vehicle power off and sleep. At the same time, the domain controller inputs the pull-in command of relays K1 and K2 to the power battery assembly respectively. The insulation detection system takes a new insulation resistance value R of the positive electrode to the ground of the charging circuit at sampling points 1 and 2. D1 , Negative pole to ground insulation resistance R D2 , the insulation resistance value taken is calculated to get the new resistance value R D1 , R D2 Compare with the threshold and report to the domain controller. D1 Less than the preset threshold or R D2 If R is less than the preset threshold, the reporting signal = 1. D1 and D R2 If both are greater than or equal to the preset threshold, the reporting signal = 0, and the domain controller displays the instrument alarm according to the relevant signal. If the reporting signal = 1, the instrument reports an insulation fault at this time, which means that the insulation of the charging circuit has failed. If the reporting signal = 0, the instrument has no insulation fault, and the insulation of the charging circuit is successful. The fault may be caused by the external conditions of the vehicle or the high-voltage components of the vehicle. The subsequent troubleshooting and locating of the insulation of the high-voltage components of the vehicle is the same as the insulation fault when the vehicle is powered on and not in the charging condition, which will not be elaborated here.

[0072] In summary, the present invention has the following advantages:

[0073] 1) When an insulation fault occurs, the insulation detection program is flashed to the controller to put all high-voltage buses in the vehicle into sleep mode, control the on and off of related relays, and perform sampling and calculation of the insulation detection system to effectively locate the relevant insulation components.

[0074] 2) Under charging conditions, it can accurately identify whether the insulation fault is caused by external conditions, which can reduce the manpower and material costs of troubleshooting.

[0075] 3) Normally closed relays are designed in each vehicle assembly to improve the effective duration of the power-on process and insulation monitoring cycle.

[0076] In addition, refer to Fig. 9 ,and Figure 2Corresponding to the method, an embodiment of the present invention also provides a vehicle high-voltage circuit insulation detection device. The device may include a first processing unit 1001 and a second processing unit 1002. The first processing unit 1001 can be used to determine that the vehicle is in a dormant state, disconnect the first relay group of any target vehicle assembly, and obtain the first positive pole-to-ground insulation resistance of the first sampling point and the first negative pole-to-ground insulation resistance of the second sampling point. The second processing unit 1002 can be used to determine that the target vehicle assembly is in an insulation failure state when the first positive pole-to-ground insulation resistance or the first negative pole-to-ground insulation resistance is less than a preset threshold; or, when the first positive pole-to-ground insulation resistance is greater than or equal to the preset threshold, and the first negative pole-to-ground insulation resistance is greater than or equal to the preset threshold, disconnect the second relay group of the high-voltage distribution box assembly, and obtain the second positive pole-to-ground insulation resistance of the first sampling point and the second negative pole-to-ground insulation resistance of the second sampling point; when the second positive pole-to-ground insulation resistance or the second negative pole-to-ground insulation resistance is less than the preset threshold, determine that the high-voltage wiring harness is in an insulation failure state.

[0077] It should be noted that the first processing unit can be any integrated circuit unit or microprocessor unit obtained by integrating a chip with processing functions and its peripheral circuits through existing integration technology. The second processing unit can also be any integrated circuit module or microprocessor module obtained by integrating a chip with processing functions and its peripheral circuits through existing integration technology. The second processing unit can also include one or more memories. One or more memories can be used to store the specific algorithm for vehicle high-voltage circuit insulation detection in the present invention.

[0078] In some embodiments of the present invention, the acquisition unit 1001 and the first processing unit 1002 may be disposed in the same device having a processor, wherein the specific device connection mode and device configuration between the acquisition unit 1001 and the first processing unit 1002 are not limited.

[0079] It should be noted that the contents of the above-mentioned embodiment of the vehicle high-voltage circuit insulation detection method are all applicable to the embodiment of the vehicle high-voltage circuit insulation detection equipment. The functions specifically implemented by the embodiment of the vehicle high-voltage circuit insulation detection equipment are the same as those in the above-mentioned embodiment of the vehicle high-voltage circuit insulation detection method, and the beneficial effects achieved are also the same as the beneficial effects achieved by the above-mentioned embodiment of the vehicle high-voltage circuit insulation detection method.

[0080] and Figure 2 Corresponding to the method, the embodiment of the present invention also provides a vehicle high-voltage circuit insulation detection device, the specific structure of which can be referred to Fig.10 , which may include:

[0081] at least one processor 1011;

[0082] At least one memory 1012, used to store at least one program;

[0083] When the at least one program is executed by the at least one processor, the at least one processor implements the vehicle high-voltage circuit insulation detection method.

[0084] The contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0085] and Figure 2 Corresponding to the method, an embodiment of the present invention further provides a computer-readable storage medium, which stores instructions executable by a processor, and the instructions executable by the processor are used to execute the vehicle high-voltage circuit insulation detection method when executed by the processor.

[0086] The contents of the above-mentioned vehicle high-voltage circuit insulation detection method embodiment are all applicable to the present storage medium embodiment. The functions specifically implemented by the present storage medium embodiment are the same as those of the above-mentioned vehicle high-voltage circuit insulation detection method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned vehicle high-voltage circuit insulation detection method embodiment.

[0087] In addition, the present invention also provides a vehicle, which may include the above-mentioned whole vehicle high-voltage circuit insulation detection device or the above-mentioned whole vehicle high-voltage circuit insulation detection equipment. Specifically, the vehicle may be a private car, such as a sedan, SUV, MPV or pickup truck. The vehicle may also be an operating vehicle, such as a van, bus, small truck or large trailer. The vehicle may be a gasoline vehicle or a new energy vehicle. When the vehicle is a new energy vehicle, it may be a hybrid vehicle or a pure electric vehicle.

[0088] The contents of the above-mentioned vehicle high-voltage circuit insulation detection device or system embodiments are all applicable to the embodiments of this vehicle. The functions specifically implemented by the embodiments of this vehicle are the same as those of the above-mentioned vehicle high-voltage circuit insulation detection device or system embodiments, and the beneficial effects achieved are also the same as the beneficial effects achieved by the above-mentioned vehicle high-voltage circuit insulation detection device or system embodiments.

[0089] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0090] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0091] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0092] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may be embodied in any computer-readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0093] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0094] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0095] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0097] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A vehicle high voltage circuit insulation detection method, characterized in that: The vehicle high-voltage circuit includes a high-voltage wiring harness, a high-voltage distribution box assembly, and a plurality of target vehicle assemblies, each of the target vehicle assemblies is connected to the high-voltage distribution box assembly via a high-voltage wiring harness, and the detection method includes: Determine that the entire vehicle is in a dormant state, disconnect the first relay group of any one of the target vehicle assemblies, and obtain the first positive electrode-to-ground insulation resistance value of the first sampling point and the first negative electrode-to-ground insulation resistance value of the second sampling point; When the insulation resistance of the first positive electrode to the ground or the insulation resistance of the first negative electrode to the ground is less than a preset threshold, determining that the target vehicle assembly is in an insulation failure state; When the first positive pole-to-ground insulation resistance is greater than or equal to the preset threshold, and the first negative pole-to-ground insulation resistance is greater than or equal to the preset threshold, the second relay group of the high-voltage distribution box assembly is disconnected, and the second positive pole-to-ground insulation resistance of the first sampling point and the second negative pole-to-ground insulation resistance of the second sampling point are obtained; when the second positive pole-to-ground insulation resistance or the second negative pole-to-ground insulation resistance is less than the preset threshold, it is determined that the high-voltage wiring harness is in an insulation failure state.

2. The vehicle high voltage circuit insulation detection method according to claim 1 is characterized in that: The vehicle high-voltage circuit also includes a power battery assembly, and the method further includes: Determine that the vehicle is in a charging condition, close the third relay group of the power battery assembly, and obtain the third positive electrode-to-ground insulation resistance value at the third sampling point and the third negative electrode-to-ground insulation resistance value at the fourth sampling point; When the insulation resistance of the third positive electrode to the ground or the insulation resistance of the third negative electrode to the ground is less than the preset threshold, it is determined that the charging circuit is in an insulation failure state.

3. The vehicle high voltage circuit insulation detection method according to claim 2 is characterized in that: The method further comprises: When the insulation resistance of the third positive electrode to the ground is greater than or equal to the preset threshold, and the insulation resistance of the third negative electrode to the ground is greater than or equal to the preset threshold, it is determined that the high-voltage component of the vehicle is in an insulation failure fault state; Alternatively, when the third positive electrode-to-ground insulation resistance is greater than or equal to the preset threshold, and the third negative electrode-to-ground insulation resistance is greater than or equal to the preset threshold, it is determined that the insulation failure fault state is caused by an external device.

4. The vehicle high-voltage circuit insulation detection method according to claim 1 is characterized in that: The method further comprises: When the insulation resistance of the first positive electrode to the ground is greater than or equal to the preset threshold, and the insulation resistance of the first negative electrode to the ground is greater than or equal to the preset threshold, it is determined that the target vehicle assembly is in an effective insulation state.

5. The vehicle high voltage circuit insulation detection method according to claim 1, characterized in that: The method further comprises: When the insulation resistance of the second positive electrode to the ground is greater than or equal to the preset threshold, or the insulation resistance of the second negative electrode to the ground is greater than or equal to the preset threshold, it is determined that the high-voltage wire harness is in an effective insulation state.

6. The vehicle high voltage circuit insulation detection method according to claim 1, characterized in that: The first relay group and the second relay group each include two relays; the relays are in a normally closed state after the entire vehicle enters the dormant state.

7. A vehicle high voltage circuit insulation detection device, characterized in that: The vehicle high-voltage circuit includes a high-voltage wiring harness, a high-voltage distribution box assembly, and a plurality of target vehicle assemblies. Each of the target vehicle assemblies is connected to the high-voltage distribution box assembly via a high-voltage wiring harness. The detection equipment includes: A first processing unit is used to determine that the whole vehicle is in a dormant state, disconnect the first relay group of any one of the target vehicle assemblies, and obtain the first positive electrode-to-ground insulation resistance value of the first sampling point and the first negative electrode-to-ground insulation resistance value of the second sampling point; The second processing unit is used to determine that the target vehicle assembly is in an insulation failure state when the first positive electrode-to-ground insulation resistance or the first negative electrode-to-ground insulation resistance is less than a preset threshold value; or, when the first positive electrode-to-ground insulation resistance is greater than or equal to the preset threshold value, and the first negative electrode-to-ground insulation resistance is greater than or equal to the preset threshold value, disconnect the second relay group of the high-voltage distribution box assembly, and obtain the second positive electrode-to-ground insulation resistance of the first sampling point and the second negative electrode-to-ground insulation resistance of the second sampling point; when the second positive electrode-to-ground insulation resistance or the second negative electrode-to-ground insulation resistance is less than the preset threshold value, determine that the high-voltage wiring harness is in an insulation failure state.

8. A vehicle high voltage circuit insulation detection device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the vehicle high-voltage circuit insulation detection method as described in any one of claims 1-6.

9. A computer-readable storage medium storing instructions executable by a processor, characterized in that: The processor executable instructions are used to execute the vehicle high-voltage circuit insulation detection method as described in any one of claims 1-6 when executed by the processor.

10. A vehicle, characterized in that: It includes the whole vehicle high-voltage circuit insulation detection equipment as described in claim 7 or the whole vehicle high-voltage circuit insulation detection device as described in claim 8.

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