A vehicle insulation detection method, device, system, vehicle and storage medium

Abstract

The present application discloses a vehicle-mounted insulation detection method, device, system, vehicle and storage medium, the method comprising: performing insulation detection according to a preset first detection cycle; determining a first insulation resistance value corresponding to the first detection cycle; determining a next detection cycle according to the first insulation resistance value; performing insulation detection according to the next detection cycle. The solution can dynamically adjust the insulation detection cycle to adapt to the accuracy and time requirements of different insulation resistance intervals, and can meet the compatibility of different vehicle models.

Description

Technical Field

[0001] The present invention generally relates to the field of detection technology, and specifically relates to an insulation detection method, device, system, vehicle and storage medium. Background Art

[0002] With the development of technology, new energy vehicles have become the development trend of the automobile industry. The power batteries of new energy vehicles generally use high voltage electricity. If the insulation between the high voltage system and the vehicle body is damaged or destroyed, the insulation performance will be reduced, which will seriously endanger the safety of the people in the car. Therefore, real-time insulation detection of the high voltage system of new energy vehicles is very important for the personal safety of vehicle personnel and the safe operation of the vehicle. Customers have higher and higher requirements for the time and accuracy of automobile insulation detection. For example, when the insulation resistance of the whole vehicle is ≤100KΩ, the detection time is required to be ≤2s, and the detection error is not greater than ±10KΩ. When the insulation resistance of the whole vehicle is 100KΩ<the insulation resistance of the whole vehicle is ≤500KΩ, the detection time is required to be ≤5s, and the detection error is not greater than ±10%.

[0003] Existing on-vehicle insulation detection systems mostly use DC injection method, balanced bridge method and unbalanced bridge method, etc., and their insulation detection cycle is a fixed cycle. When the Y capacitance of the whole vehicle is large, it is impossible to take into account both the rapid detection in the low insulation resistance range and the detection accuracy in the high insulation resistance range, which restricts the compatibility of the detection system in the application of different models. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an insulation detection method, device, system, vehicle and storage medium.

[0005] In a first aspect, the present invention provides a vehicle-mounted insulation detection method, the method comprising:

[0006] Performing insulation testing on the insulation resistance in the vehicle-mounted high voltage system according to a preset first testing cycle;

[0007] Determine a first insulation resistance value corresponding to a first detection cycle;

[0008] Determining a next detection cycle according to the first insulation resistance value;

[0009] Perform insulation test on insulation resistance according to the next test cycle.

[0010] In one embodiment, determining the next detection cycle according to the first insulation resistance value includes:

[0011] If the first insulation resistance value is less than the first upper limit threshold, the first detection cycle is determined to be the next detection cycle.

[0012] In one embodiment, determining the next detection cycle according to the first insulation resistance value includes:

[0013] If the first insulation resistance value is greater than or equal to the first upper limit threshold, determine the second detection period according to the first insulation resistance value, the preset vehicle Y capacitance, and the first interval coefficient;

[0014] The second detection cycle is determined as the next detection cycle.

[0015] In one embodiment, determining the next detection cycle according to the current detection cycle includes:

[0016] Determine the current insulation resistance value corresponding to the current detection cycle;

[0017] If the current insulation resistance value is greater than or equal to the current lower threshold and less than the current upper threshold, the current detection cycle is determined to be the next detection cycle;

[0018] If the current insulation resistance value is less than the current lower threshold or greater than or equal to the current upper threshold, the next detection cycle is determined based on the current insulation resistance value, the preset vehicle Y capacitance, and the second interval coefficient.

[0019] In one embodiment,

[0020] If the current insulation resistance value is less than the first upper limit threshold, the first detection cycle is determined to be the next detection cycle.

[0021] In one embodiment, determining the next detection cycle according to the current insulation resistance value includes:

[0022] According to the current insulation resistance value, based on the periodic classification detection correspondence table, determining the third detection period, the periodic classification detection correspondence table representing the correspondence between the insulation resistance value and the detection period;

[0023] The third detection cycle is determined as the next detection cycle.

[0024] In a second aspect, the present invention provides a vehicle-mounted insulation detection device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of the first aspect when executing the computer program.

[0025] In a third aspect, the present invention provides a vehicle-mounted insulation detection system, the system comprising:

[0026] The vehicle-mounted insulation detection device of the second aspect;

[0027] High-voltage wiring connector, which is connected to the positive and negative busbars of the vehicle;

[0028] A low-voltage power supply connector, which is connected to the power supply module;

[0029] A grounding wire connector, the grounding wire connector is connected to the vehicle body ground;

[0030] A communication connector, the communication connector is connected to a vehicle controller;

[0031] The high voltage wiring connector, the low voltage power supply connector, the ground wire connector, and the communication connector are all connected to the vehicle-mounted insulation detection device.

[0032] In a fourth aspect, the present invention provides a vehicle, the vehicle comprising the on-board insulation detection system of the third aspect.

[0033] In a fifth aspect, the present invention provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method of the first aspect.

[0034] The present invention provides a vehicle-mounted insulation detection method, device, system, vehicle and storage medium. The scheme first uses the fastest detection cycle, the first detection cycle, to perform insulation detection on the insulation resistance to ensure that the low insulation resistance can be detected at the fastest speed, and then determines the first insulation resistance value corresponding to the first detection cycle, and determines the next detection cycle according to the first insulation resistance value, so as to dynamically adjust the insulation detection cycle to adapt to the accuracy and time requirements of different insulation resistance intervals, and can meet the compatibility of different vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0036] Figure 1 A block diagram showing an example of a hardware configuration of a vehicle-mounted insulation detection device that can be used to implement an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the structure of a vehicle-mounted insulation detection system provided by an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the connection between the vehicle insulation detection system provided by the embodiment of the present invention and the whole vehicle Figure 1 ;

[0039] Figure 4 Schematic diagram of the connection between the vehicle insulation detection system provided by the embodiment of the present invention and the whole vehicle Figure 2 ;

[0040] Figure 5 Schematic diagram of the connection between the vehicle insulation detection system provided by the embodiment of the present invention and the whole vehicle Figure 3 ;

[0041] Figure 6 Schematic diagram of the connection between the vehicle insulation detection system provided by the embodiment of the present invention and the whole vehicle Figure 4 ;

[0042] Figure 7 Schematic diagram of the connection between the vehicle insulation detection system provided by the embodiment of the present invention and the whole vehicle Figure 5 ;

[0043] Figure 8 A schematic diagram of a process flow of a vehicle-mounted insulation detection method provided by an embodiment of the present invention;

[0044] Fig. 9 Another schematic diagram of a process of the vehicle insulation detection method provided by an embodiment of the present invention;

[0045] Fig.10 Another schematic diagram of a process of the vehicle insulation detection method provided by an embodiment of the present invention;

[0046] Fig.11 A schematic structural diagram of a vehicle-mounted insulation detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0048] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described can be implemented in an order other than those illustrated or described herein.

[0050] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] In the related art, the insulation detection cycle for the insulation detection of the high-voltage system of new energy vehicles is a fixed cycle. When the Y capacitor of the whole vehicle (the Y capacitor of the whole vehicle is used to improve the electromagnetic compatibility EMC performance of the high-voltage load of the whole vehicle, the property of the power battery itself will have Y capacitor, and Y capacitor is an inherent property of the whole vehicle) is large, it is impossible to take into account the rapid detection of the low insulation resistance interval and the detection accuracy of the high insulation resistance interval, which restricts the compatibility of the detection system in the application of different models. Among them, new energy vehicles can include pure electric vehicles, hybrid electric vehicles, etc. It should be noted that since the voltage below 60V is a safe voltage, the new energy vehicle of this application can be a vehicle with a power battery pack voltage higher than 60V.

[0053] In order to solve the above problems, the present application proposes a vehicle-mounted insulation detection method, which can dynamically adjust the insulation detection cycle to adapt to the accuracy and time requirements of different insulation resistance ranges, and can meet the compatibility of different vehicle models.

[0054] It should be noted that the vehicle insulation detection method provided in the embodiment of the present application may be executed by a vehicle insulation detection device, which may be implemented as part or all of the vehicle through software, hardware, or a combination of software and hardware. Figure 1 The vehicle-mounted insulation detection device shown is taken as an example for explanation.

[0055] Figure 1 is a block diagram showing a hardware configuration of the vehicle-mounted insulation detection device 100 that can implement the embodiment of the present application.

[0056] like Figure 1As shown, a vehicle-mounted insulation detection device 100 may include a processor 110, a memory 120, an interface module 130, a communication module 140, etc. Among them, the processor 110 may be a central processing unit CPU, a microprocessor MCU, etc. The memory 120 includes, for example, ROM (read-only memory), RAM (random access memory), a non-volatile memory such as a hard disk, etc. The interface module 130 includes, for example, a high-voltage wiring interface, a grounding interface, a low-voltage power supply interface, etc. The communication module 140, for example, can perform wired or wireless communication, and specifically may include Wifi communication, Bluetooth communication, 2G / 3G / 4G / 5G communication, CAN (Controller Area Network, controller local area network) communication, SPI (Serial Peripheral Interface, serial peripheral interface) communication, LIN (Local Interconnect Network, local interconnect network) communication, etc.

[0057] Figure 1 The vehicle-mounted insulation detection device shown is merely illustrative and does not in any way limit the present invention, its application or use. In the embodiment of the present invention, the memory 120 of the vehicle-mounted insulation detection device 100 is used to store instructions, and the instructions are used to control the processor 110 to operate to perform any vehicle-mounted insulation detection method provided by the embodiment of the present invention. It should be understood by those skilled in the art that although Figure 1 The on-board insulation detection device 100 shows multiple modules, but the present invention may only involve some of the modules, for example, the on-board insulation detection device 100 only involves the processor 110 and the storage device 120. The technicians can design instructions according to the scheme disclosed in the present invention. How the instructions control the processor to operate is well known in the art, so it will not be described in detail here.

[0058] The present application also provides a vehicle-mounted insulation detection system 200. Figure 2 As shown, the vehicle insulation detection system 200 may include:

[0059] The vehicle-mounted insulation detection device 100 provided in the above embodiment;

[0060] High-voltage wiring connector 210, which is connected to the positive and negative busbars of the vehicle;

[0061] A low voltage power supply connector 220, the low voltage power supply connector 220 is connected to the power supply module;

[0062] A grounding wire connector 230, the grounding wire connector 230 is connected to the vehicle body ground;

[0063] A communication connector 240, the communication connector 240 is connected to the vehicle controller;

[0064] The high voltage wiring connector 210 , the low voltage power supply connector 220 , the ground wire connector 230 , and the communication connector 240 are all connected to the vehicle-mounted insulation detection device 100 .

[0065] Specifically, the vehicle insulation detection system is connected to the positive and negative busbars of the vehicle or to the positive or negative electrode separately through high-voltage wiring connectors and wiring harnesses. Figure 3-Figure 7 Five connection modes of the vehicle-mounted insulation detection system 200 and the positive and negative busbars and loads of the vehicle are shown.

[0066] like Figure 3 As shown, the high-voltage wiring connector is connected to the outside of the switch of the positive and negative busbars of the vehicle (connecting the positive and negative electrodes of the power battery pack respectively). Figure 4 -As shown in 7, the high voltage wiring connector is connected to the inner side of the switch of the positive and negative busbars of the vehicle. Figure 4 As shown, the high-voltage wiring connector connects the positive and negative busbars of the vehicle at the same time. Figure 5 and Figure 6 As shown, the high-voltage wiring connector is connected to the positive busbar of the vehicle (such as Figure 5 ) or separately with the vehicle negative busbar (such as Figure 6 ) connection, such as Figure 7 As shown, the high-voltage wiring connector can also be connected to only any high-voltage node in the power battery pack.

[0067] When the high-voltage wiring connector is connected to the outside of the switch of the positive and negative busbars of the vehicle, when the switch is closed, the on-board insulation detection system is used to detect the parallel insulation resistance of the high-voltage loads directly or indirectly connected to the positive and negative busbars of the vehicle, such as the power battery pack and DC / DC (Direct current-Direct current, high-voltage direct current to low-voltage direct current) converter, charger, motor controller, etc., that is, the entire high-voltage system loop.

[0068] When the high-voltage wiring connector is connected to the inner side of the switch of the positive and negative busbars of the vehicle, when the switch is disconnected, it is used by the on-board insulation detection system to detect the insulation resistance of the power battery pack and the high-voltage system circuit inside the switch. When the switch is closed, it is used by the on-board insulation detection system to detect the parallel insulation resistance of the high-voltage loads directly or indirectly connected to the positive and negative busbars of the vehicle, such as the power battery of the vehicle, the DC / DC converter, the charger, the motor controller, etc.

[0069] In this embodiment, the insulation detection system is connected to the positive and negative busbars of the vehicle through a high-voltage wiring connector, and is connected to the ground of the vehicle body through a grounding wire connector. When the vehicle supplies power to the insulation detection system through a low-voltage power supply connector, the insulation detection system completes initialization and can perform insulation detection on the insulation resistance. The insulation detection system calculates the insulation resistance value of the vehicle (i.e., the insulation resistance value of the insulation resistance in the high-voltage system of the vehicle), and then determines the next detection cycle for insulation detection of the insulation resistance according to the relationship between the insulation resistance value and the critical value of each insulation resistance interval or the insulation resistance value and the period classification detection correspondence table, so that the detection cycle can be dynamically switched with the change of the insulation resistance value, and the shortest detection cycle is used in the corresponding insulation resistance interval, with a short detection cycle, high accuracy and strong compatibility.

[0070] An embodiment of the present application also provides a vehicle, which may include the on-board insulation detection system provided in the above embodiment.

[0071] Reference Figure 8 , which shows a flow chart of a vehicle-mounted insulation detection method described according to an embodiment of the present application.

[0072] like Figure 8 As shown, a vehicle insulation detection method may include:

[0073] S810, performing insulation testing on the insulation resistance in the vehicle-mounted high voltage system according to a preset first testing cycle;

[0074] S820, determining a first insulation resistance value corresponding to a first detection cycle;

[0075] S830, determining a next detection cycle according to the first insulation resistance value;

[0076] S840, perform insulation testing on the insulation resistance according to the next testing cycle.

[0077] Specifically, the preset first detection period T 1 It can be set according to actual needs, for example, it can be set according to the specific vehicle Y capacitor size, insulation resistance range, and accuracy requirements. The first detection cycle is the fastest detection cycle (i.e., the shortest detection cycle) that can meet the vehicle Y capacitor size, insulation resistance range, and accuracy requirements.

[0078] After the vehicle insulation detection system is initialized, the insulation resistance is detected by default at the fastest detection cycle with low insulation resistance value, that is, at the first detection cycle T 1 Perform insulation testing on the insulation resistance.

[0079] When the vehicle high voltage sampling information is obtained, the first insulation resistance value R_T in the first detection cycle is calculated. 1. Specifically, the first insulation resistance value refers to the resistance value of the insulation resistance in the high-voltage circuit of the whole vehicle. It should be noted that the above embodiments have explained that the connection method between the on-board insulation detection system and the positive and negative bus switches of the whole vehicle is different, and the components involved in calculating the insulation resistance value are different, which will not be repeated here. When calculating the insulation resistance, it can be calculated based on the voltage sampling information corresponding to the two circuit states included in each detection cycle. This calculation method is a prior art and will not be repeated here.

[0080] The next detection cycle is determined according to the first insulation resistance value calculated above, and the insulation detection of the insulation resistance can be switched to the corresponding detection cycle according to the relationship between the first insulation resistance value and the detection threshold or the detection cycle correspondence table, etc. The next detection cycle refers to the cycle of the next insulation detection of the insulation resistance after the current insulation detection of the insulation resistance.

[0081] In this embodiment, the insulation resistance is first tested using the first test cycle, which is the fastest test cycle, to ensure that low insulation resistance can be tested at the fastest speed. Then, the first insulation resistance value corresponding to the first test cycle is determined, and the next test cycle is determined by the first insulation resistance value. The insulation test cycle is dynamically adjusted to adapt to the accuracy and time requirements of different insulation resistance intervals, thereby meeting the compatibility of different vehicle models.

[0082] In one embodiment, determining the next detection cycle according to the first insulation resistance value includes:

[0083] If the first insulation resistance value is less than the first upper limit threshold, the first detection cycle is determined to be the next detection cycle.

[0084] Specifically, the first upper threshold R_T 1 _high is a critical value for determining whether to continue to use the first detection cycle or other detection cycles in the next detection cycle. The first upper limit threshold is set according to actual needs.

[0085] If R_T 1 <R_T 1 _high, the insulation resistance will continue to be tested with the first test cycle as the test cycle.

[0086] In one embodiment, if the first insulation resistance value is greater than or equal to the first upper limit threshold, the second detection period is determined according to the first insulation resistance value, the preset vehicle Y capacitance, and the first interval coefficient;

[0087] According to the second detection cycle, a next detection cycle is determined. Optionally, the second detection cycle is determined as the next detection cycle.

[0088] Specifically, the preset vehicle Y capacitor C is set when the vehicle is designed.

[0089] The first interval coefficient K_T 1 It is a coefficient calibrated on the whole vehicle according to the preset vehicle Y capacitance, insulation resistance range and accuracy requirements.

[0090] If R_T 1 ≥R_T 1 _high, the second detection period T 2 The insulation resistance is tested for the detection period. The second detection period can be based on the first insulation resistance value R_T 1 , preset vehicle Y capacitance C, first interval coefficient K_T 1 Determine, the second detection period T 2 Can be:

[0091] T 2 =R_T 1 ×C×K_T 1 .

[0092] In one embodiment, determining the next detection cycle according to the current detection cycle may include:

[0093] Determine the current insulation resistance value corresponding to the current detection cycle;

[0094] If the current insulation resistance value is greater than or equal to the current lower threshold and less than the current upper threshold, the current detection cycle is determined to be the next detection cycle;

[0095] If the current insulation resistance value is less than the current lower threshold or greater than or equal to the current upper threshold, the next detection cycle is determined based on the current insulation resistance value, the preset vehicle Y capacitance, and the second interval coefficient.

[0096] Specifically, the current detection cycle refers to the cycle when the insulation resistance is currently being tested, for example, the first detection cycle and the second detection cycle in the above embodiment. The current detection cycle may also be other detection cycles.

[0097] Determine the current detection period T x Corresponding current insulation resistance value R_T x The first insulation resistance value R_T in the first detection cycle can be determined according to 1 The method is determined by , which will not be described here.

[0098] Current upper threshold R_T x _high and the current lower threshold R_T x_low is the critical value (critical upper limit value and critical lower limit value) for judging whether the next detection cycle continues to use the current detection cycle or uses other detection cycles. The current upper limit threshold and the current lower limit threshold are set according to actual needs. It should be noted that the critical values ​​of adjacent insulation resistance intervals can be set crosswise or overlapping, that is, for example, the first insulation resistance interval and the second insulation resistance interval are adjacent, and the resistance value of the first insulation resistance interval is less than the resistance value of the second insulation resistance interval, and the critical values ​​of the first insulation resistance interval are R_T_high and R_T_low, respectively. 一 _low, the critical values ​​of the second insulation resistance interval are R_T 二 _high and R_T 二 _low, the critical value cross setting of adjacent insulation resistance intervals refers to R_T 一 _high>R_T 二 _low, the overlapping setting of the critical values ​​of adjacent insulation resistance intervals refers to R_T 一 _high=R_T 二 _low, so that when the next detection cycle is determined according to the insulation resistance value, all insulation resistance values ​​can fall into the insulation resistance interval without missing any part. It should be noted that the division of the insulation resistance interval can be divided according to actual needs.

[0099] If R_T x _low≤R_T x <R_T x When _high, the insulation resistance is continuously tested with the current test cycle as the test cycle.

[0100] If R_T x ≥R_T x _high or R_T x <R_T x _low, then the next detection cycle T x The insulation resistance is tested for the test cycle. The next test cycle can be based on the current insulation resistance value R_T x-1 , preset vehicle Y capacitance C, first interval coefficient K_T x-1 To determine, the next detection cycle T x Can be:

[0101] T x =R_T x-1 ×C×K_T x-1 .

[0102] In this embodiment, the insulation resistance intervals are divided into multiple levels. The next detection cycle is determined based on the comparison between the current insulation detection resistance and the critical value of each interval, and the detection cycle is dynamically switched across intervals. When the insulation resistance is tested, the detection cycle used continuously adapts to the shortest detection time corresponding to each interval, and the detection cycle is short, the accuracy is high, and the compatibility is strong.

[0103] In one embodiment, the vehicle insulation detection method further includes:

[0104] If the current insulation resistance value is less than the first upper limit threshold, the preset first detection cycle is determined as the next detection cycle.

[0105] Specifically, when R_T is detected x <R_T 1 When the first detection period T 1 The insulation test is performed for the insulation resistance during the test period.

[0106] In one embodiment, determining the next detection cycle according to the current insulation resistance value may include:

[0107] According to the current insulation resistance value, based on the periodic classification detection correspondence table, determining the third detection period, the periodic classification detection correspondence table representing the correspondence between the insulation resistance value and the detection period;

[0108] The third detection cycle is determined as the next detection cycle.

[0109] Specifically, the periodic graded detection correspondence table may be pre-stored in the memory of the vehicle-mounted insulation detection device, or may be stored in other servers, or may be stored in other storage devices, which is not limited here.

[0110] According to the above embodiment, the current insulation resistance value can be determined. When the current insulation resistance value is obtained, the periodic classification detection correspondence table is searched according to the current insulation resistance value to obtain the third detection cycle, and the third detection cycle is used as the detection cycle for the next insulation detection.

[0111] In the embodiment of the present application, the detection cycle of insulation detection is continuously and dynamically switched according to the insulation resistance value, so that the insulation resistance value can be detected at the fastest detection speed in the corresponding insulation resistance range while ensuring the detection accuracy, that is, the detection speed is improved.

[0112] Combine the following Fig. 9 Explain the above-mentioned vehicle insulation detection method:

[0113] S910, insulation monitoring system initialization completed;

[0114] S920, insulation monitoring system defaults to the fastest detection cycle T 1Insulation testing of insulation resistance to quickly detect low insulation resistance values;

[0115] S930, insulation monitoring system calculates the fastest detection cycle T 1 Corresponding insulation resistance value R_T 1 ;

[0116] S940, determine R_T 1 Is < R_T 1 _high, if the insulation resistance value R_T 1 <R_T 1 _high, then go to step S920, if the insulation resistance value R_T 1 ≥R_T1_high, go to step S950;

[0117] S950, insulation monitoring system according to R_T 1 Calculate the detection period T 2 :T 2 =R_T 1 ×C×K_T 1 , where T 2 To perform the detection cycle, R_T 1 is the fastest detection cycle T 1 The calculated insulation resistance value, C is the vehicle Y capacitance, K_T 1 It is the coefficient calibrated on the vehicle according to the vehicle Y capacitance, insulation resistance range and accuracy requirements;

[0118] S960, insulation monitoring system with detection period T 2 Conduct insulation testing on insulation resistance;

[0119] S970, insulation monitoring system calculation detection cycle T 2 Corresponding insulation resistance value R_T 2 ;

[0120] S980, determine R_T 2 Is <R_T 2 _high if R_T 2 <R_T 2 _high, then enter S990; if R_T 2 ≥R_T 2 _high, then enter S9100;

[0121] S990, judge R_T 2 <R_T 2 _high and R_T 2 _low≤R_T 2 , if R_T 2 _low≤R_T 2<R_T 2 _high, then go to step S960; if R_T 2 <R_T 2 _low, go to step S9100;

[0122] S9100, insulation monitoring system calculation detection cycle T x ; Among them, the detection period T x Can include in addition to the above T 1 and T 2 External testing cycle;

[0123] S9110, insulation monitoring system with detection period T x Conduct insulation testing on insulation resistance;

[0124] S9120, insulation monitoring system calculation detection cycle T x Corresponding insulation resistance value R_T x ;

[0125] S9130, judge R_T x Is <R_T x _high, if R_T x <R_T x _high, then enter S9140; if R_T x ≥R_T x _high, then enter S9150;

[0126] S9140, judge R_T x <R_T 2 _high and R_T x _low≤R_T x , if R_T x _low≤R_T x <R_T x _high, then enter S9110, if R_T x <R_T x _low, then enter S9150;

[0127] S9150, perform insulation test on insulation resistance with a new test cycle, and make dynamic judgment. When the insulation resistance is less than R_T 1 _high returns to the default detection period T 1 , and so on in a dynamic cycle.

[0128] Combine the following Fig.10 Explain the above-mentioned vehicle insulation detection method:

[0129] S1010, insulation monitoring system initialization completed;

[0130] S1020, insulation monitoring system defaults to the fastest detection cycle T 1 Conduct insulation testing on insulation resistance;

[0131] S1030, insulation monitoring system calculates detection cycle T 1 Corresponding insulation resistance R n ;

[0132] S1040, based on the calculated resistance value R n Check the period classification detection correspondence table to determine the corresponding detection period T n ;

[0133] S1050, with a detection period T n Perform insulation testing on the insulation resistance.

[0134] Reference Fig.11 , which shows a schematic structural diagram of a vehicle-mounted insulation detection device described according to an embodiment of the present application.

[0135] like Fig.11 As shown, a vehicle-mounted insulation detection device 1100 may include:

[0136] The memory 1110, the processor 1120 and a computer program stored in the memory and executable on the processor. When the processor 1120 executes the computer program, the vehicle-mounted insulation detection method of any of the above embodiments is implemented.

[0137] In this embodiment, the vehicle-mounted insulation detection device 1100 may be any device that can implement the vehicle-mounted insulation detection method. The vehicle-mounted insulation detection device 1100 may also include other hardware devices, such as Figure 1 The vehicle-mounted insulation detection device 100 is shown.

[0138] The present application may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium. The storage medium may be the storage medium included in the aforementioned device in the above-mentioned embodiment; or it may be a storage medium that exists independently and is not assembled into the device. The storage medium stores one or more computer-readable program instructions for enabling the processor to implement various aspects of the present application, and the aforementioned instructions are used by one or more processors to execute the vehicle-mounted insulation detection method described in the present application.

[0139] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0140] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0141] The computer program instructions for performing the operation of the present application can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions can be executed completely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer, partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of computer-readable program instructions to personalize electronic circuits, such as programmable logic circuits, field programmable gate arrays (FPGAs) or programmable logic arrays (PLAs), the electronic circuits can execute computer-readable program instructions, thereby realizing various aspects of the present application.

[0142] Various aspects of the present application are described herein with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer-readable program instructions.

[0143] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0144] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0145] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a part of a module, program segment or instruction, and the part of the module, program segment or instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0146] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A vehicle-mounted insulation detection method, characterized in that: The method comprises: Performing insulation testing on the insulation resistance in the vehicle-mounted high voltage system according to a preset first testing cycle; Determining a first insulation resistance value corresponding to the first detection cycle; Determining the next detection cycle according to the first insulation resistance value includes: determining the next detection cycle for performing insulation detection on the insulation resistance according to the relationship between the first insulation resistance value and the critical value of each insulation resistance interval or the first insulation resistance value and the period classification detection correspondence table, specifically as follows: If the first insulation resistance value is greater than or equal to the first upper limit threshold, determine the second detection cycle according to the first insulation resistance value, the preset vehicle Y capacitor, and the first interval coefficient; determine the second detection cycle as the next detection cycle; wherein the preset vehicle Y capacitor C is set when designing the vehicle; The insulation resistance is tested according to the next test cycle.

2. The method according to claim 1, characterized in that The step of determining a next detection cycle according to the first insulation resistance value includes: If the first insulation resistance value is less than a first upper limit threshold, the first detection cycle is determined to be the next detection cycle.

3. The method according to claim 1, characterized in that The method further includes: determining the next detection cycle according to the current detection cycle, including: Determine a current insulation resistance value corresponding to the current detection cycle; If the current insulation resistance value is greater than or equal to the current lower threshold value and less than the current upper threshold value, determining that the current detection cycle is the next detection cycle; If the current insulation resistance value is less than the current lower limit threshold or greater than or equal to the current upper limit threshold, the next detection cycle is determined according to the current insulation resistance value, the preset vehicle Y capacitance, and the second interval coefficient.

4. The method according to claim 3, characterized in that The method further comprises: If the current insulation resistance value is less than the first upper limit threshold, the first detection cycle is determined to be the next detection cycle.

5. The method according to claim 1, characterized in that The method further includes: determining a next detection cycle according to the current insulation resistance value, including: According to the current insulation resistance value, based on a period-grading detection correspondence table, determining a third detection period, wherein the period-grading detection correspondence table represents a correspondence between insulation resistance values ​​and detection periods; The third detection cycle is determined as the next detection cycle.

6. A vehicle-mounted insulation detection device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 5 is implemented.

7. A vehicle-mounted insulation detection system, characterized in that: The system comprises: The vehicle-mounted insulation detection device according to claim 6; A high-voltage wiring connector, which is connected to the positive and negative busbars of the vehicle; A low-voltage power supply connector, which is connected to the power supply module; A grounding wire connector, the grounding wire connector is connected to the vehicle body ground; A communication connector, the communication connector is connected to a vehicle controller; The high-voltage wiring connector, the low-voltage power supply connector, the grounding wire connector, and the communication connector are all connected to the vehicle-mounted insulation detection device.

8. A vehicle, characterized in that: The vehicle comprises the on-vehicle insulation detection system according to claim 7.

9. A readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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