Control method and device for automobile insulation detection circuit

Abstract

The present application provides a method and device for controlling an automotive insulation detection circuit. The method includes: obtaining a first voltage value and a second voltage value when a first switching device and a second switching device are closed, wherein the first voltage value is the voltage value of the second end of a first detection resistor, and the second voltage value is the voltage value of the second end of a second detection resistor; controlling the first switching device or the second switching device to be disconnected, and obtaining a third voltage value, wherein the third voltage value is the voltage value of the second end of the second detection resistor when the first switching device is disconnected, and the third voltage value is the voltage value of the second end of the first detection resistor when the second switching device is disconnected; and determining the insulation resistance value based on the first voltage value, the second voltage value, and the third voltage value. The present application solves the problem of the complex and high cost of testing automotive insulation detection circuits in the prior art.

Description

Technical Field

[0001] The present application relates to the field of automotive insulation circuit detection, and more specifically, to a control method, device, computer-readable storage medium, processor, and control system for an automotive insulation detection circuit. Background Art

[0002] In the prior art, the testing process of an automobile insulation detection circuit is relatively complex and costly.

[0003] The above information disclosed in the background technology section is only used to enhance the understanding of the background technology of the technology described in this article. Therefore, the background technology may contain certain information that does not form the prior art known in this country to those skilled in the art. Summary of the Invention

[0004] The main purpose of this application is to provide a control method, device, computer-readable storage medium, processor and control system for an automobile insulation detection circuit to solve the problem that the automobile insulation detection circuit testing process in the prior art is relatively complicated and costly.

[0005] According to one aspect of an embodiment of the present invention, a method for controlling an automobile insulation detection circuit is provided. The automobile insulation detection circuit includes a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device. The first end of the first detection resistor is electrically connected to the first end of the first switching device, the second end of the first detection resistor is electrically connected to the first end of the first sampling resistor, the first end of the second detection resistor is electrically connected to the first end of the second switching device, the second end of the second detection resistor is electrically connected to the first end of the second sampling resistor, the second end of the first sampling resistor and the second end of the second sampling resistor are respectively electrically connected to the body of the automobile, the second end of the first switching device is electrically connected to one end of the battery of the automobile, and the second end of the second switching device is electrically connected to the first end of the second switching device. The second end is used to electrically connect to the other end of the battery, and the method includes: when the first switching device and the second switching device are closed, obtaining a first voltage value and a second voltage value, the first voltage value is the voltage value of the second end of the first detection resistor, and the second voltage value is the voltage value of the second end of the second detection resistor; controlling the first switching device or the second switching device to be disconnected, and obtaining a third voltage value, when the first switching device is disconnected, the third voltage value is the voltage value of the second end of the second detection resistor, and when the second switching device is disconnected, the third voltage value is the voltage value of the second end of the first detection resistor; according to the first voltage value, the second voltage value and the third voltage value, determining the insulation resistance value, the insulation resistance being the resistance of the vehicle connected to the two ends of the battery.

[0006] Optionally, the resistance of the first sampling resistor and the second sampling resistor are both less than a predetermined value, the first sampling resistor, the first detection resistor, and the first switching device constitute a first branch, and the second sampling resistor, the second detection resistor, and the second switching device constitute a second branch. Determining the insulation resistance of the vehicle according to the first voltage value, the second voltage value, and the third voltage value includes: when the first voltage value and the second voltage value are both greater than a first predetermined voltage, determining that the insulation resistance includes a first equivalent resistor and a second equivalent resistor connected in series, and the first equivalent resistor is connected in parallel at both ends of the first branch, and the second equivalent resistor is connected in parallel at both ends of the second branch; obtaining a fourth voltage value by subtracting the sum of the first voltage value and the second voltage value from the third voltage value; and when the first switching device is disconnected, determining the insulation resistance according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R n / / R2) / (R p ) and R=R p +R n , calculate the insulation resistance, where V1 is the first voltage value, V2 is the second voltage value, V3 is the third voltage value, V4 is the fourth voltage value, R1 is the resistance value of the first detection resistor, R2 is the resistance value of the second detection resistor, R p is the resistance of the first equivalent resistor, R n is the resistance of the second equivalent resistor, R is the resistance of the insulation resistor; when the second switch device is disconnected, according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R1 / / R p ) / (R n ) and R=R p +R n , calculate the insulation resistance.

[0007] Optionally, the resistances of the first sampling resistor and the second sampling resistor are both less than a predetermined value, the first sampling resistor, the first detection resistor, and the first switching device form a branch, and the second sampling resistor, the second detection resistor, and the second switching device form another branch. Determining the insulation resistance of the vehicle based on the first voltage value, the second voltage value, and the third voltage value includes: when the first voltage value or the second voltage value is less than or equal to a first predetermined voltage, determining that the insulation resistor is connected in parallel across the branch corresponding to a target voltage, wherein the target voltage is a voltage value between the first voltage value and the second voltage value that is greater than the first predetermined voltage; and calculating the insulation resistance according to V1 / V2=R / / R', wherein R is the insulation resistance, R' is the first detection resistance when the target voltage is the first voltage value, and R' is the second detection resistance when the target voltage is the second voltage value.

[0008] Optionally, after obtaining the third voltage value, the method further includes: obtaining a fourth voltage value by subtracting the third voltage value from the sum of the first voltage value and the second voltage value; obtaining a first difference and a second difference, wherein the first difference is the difference between the first voltage value and the third voltage value, and the second difference is the difference between the second voltage value and the fourth voltage value; determining whether the first difference or the second difference is less than or equal to a second predetermined voltage; and determining that a short circuit fault has occurred in the battery if the first difference or the second difference is less than or equal to the second predetermined voltage.

[0009] Optionally, after obtaining the third voltage value, the method further includes: when the third voltage value is 0, determining that the insulation resistor is not connected to both ends of the battery.

[0010] Optionally, controlling the first switching device or the second switching device to be disconnected includes: controlling the second switching device to be disconnected when the first voltage value is greater than or equal to the second voltage value; and controlling the first switching device to be disconnected when the first voltage value is less than the second voltage value.

[0011] According to another aspect of an embodiment of the present invention, a control device for an automobile insulation detection circuit is further provided. The automobile insulation detection circuit includes a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device, wherein a first end of the first detection resistor is electrically connected to a first end of the first switching device, a second end of the first detection resistor is electrically connected to a first end of the first sampling resistor, a first end of the second detection resistor is electrically connected to a first end of the second switching device, a second end of the second detection resistor is electrically connected to a first end of the second sampling resistor, the second end of the first sampling resistor and the second end of the second sampling resistor are respectively configured to be electrically connected to a vehicle body, a second end of the first switching device is configured to be electrically connected to one end of a battery of the vehicle, and a second end of the second switching device is configured to be electrically connected to the battery. The other end of the battery is electrically connected, and the device includes: a first acquisition unit, which acquires a first voltage value and a second voltage value when the first switching device and the second switching device are closed, the first voltage value is the voltage value of the second end of the first detection resistor, and the second voltage value is the voltage value of the second end of the second detection resistor; a control unit, which controls the first switching device or the second switching device to be disconnected, and acquires a third voltage value, when the first switching device is disconnected, the third voltage value is the voltage value of the second end of the second detection resistor, when the second switching device is disconnected, the third voltage value is the voltage value of the second end of the first detection resistor; a first determination unit, which determines the value of the insulation resistance according to the first voltage value, the second voltage value and the third voltage value, and the insulation resistance is the resistance of the vehicle connected to the two ends of the battery.

[0012] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the methods described above.

[0013] According to yet another aspect of an embodiment of the present invention, a processor is provided, wherein the processor is configured to run a program, wherein any one of the methods is executed when the program is run.

[0014] According to another aspect of an embodiment of the present invention, a control system is provided, including an automobile insulation detection circuit and a control device for the automobile insulation detection circuit. The automobile insulation detection circuit includes a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device. The first end of the first detection resistor is electrically connected to the first end of the first switching device, the second end of the first detection resistor is electrically connected to the first end of the first sampling resistor, the first end of the second detection resistor is electrically connected to the first end of the second switching device, and the second end of the second detection resistor is electrically connected to the first end of the second sampling resistor. The second end of the first sampling resistor and the second end of the second sampling resistor are respectively configured to be electrically connected to a vehicle body. The second end of the first switching device is configured to be electrically connected to one end of a battery of the vehicle, and the second end of the second switching device is configured to be electrically connected to the other end of the battery. The control device for the automobile insulation detection circuit includes one or more processors, a memory, and one or more programs. The one or more programs are stored in the memory and configured to be executed by the one or more processors. The one or more programs include a program for executing any one of the methods described.

[0015] In an embodiment of the present invention, a control method for an automotive insulation detection circuit of the present application first obtains a first voltage value and a second voltage value when a first switching device and a second switching device are closed. Then, the first switching device or the second switching device is controlled to be open to obtain a third voltage value. Finally, the insulation resistance of the vehicle is determined based on the first, second, and third voltage values. Compared to conventional automotive insulation detection circuits, which have a complex testing process and high costs, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower testing costs. Furthermore, the control process of the detection circuit is relatively simple, ensuring the practicality of the detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0017] Figure 1 Shows a schematic diagram of the structure of an existing automobile insulation detection circuit;

[0018] Figure 2 A schematic diagram of a control method for an automobile insulation detection circuit according to an embodiment of the present application is shown;

[0019] Figure 3 A schematic structural diagram of an automobile insulation detection circuit according to an embodiment of the present application is shown;

[0020] Figure 4 A schematic diagram of a control device of an automobile insulation detection circuit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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.

[0022] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element or intervening elements may be present. Moreover, in the specification and claims, when it is described that an element is "connected to" another element, the element may be "directly connected to" the other element or "connected to" the other element through a third element.

[0025] The original automobile insulation detection circuit is as follows Figure 1 As shown, where R p and R n The insulation resistance of the car to be tested, R7, R8, K1, K2, R1, R2, R3 and R4 constitute the detection circuit, and their connection relationship is as follows Figure 1 The detection process is as follows: separately pull in K1 or K2: respectively collect the voltage V1 of PACK+ to ground and the voltage V2 of PACK- to ground, then the following equation can be listed:

[0026] When K1 is energized, equation 1: V1 / V2=(R p / / R7 / / R1) / (R n / / R8);

[0027] When K2 is energized, equation 2: V1 / V2=(R p / / R7) / (R n / / R8 / / R2);

[0028] Among them, R3 and R4 are voltage collection resistors, and their resistance values ​​are small and can be ignored. Using equations 1 and 2, the insulation resistance R can be solved. p and R n The above insulation detection circuit requires many resistors and the detection process is relatively complicated.

[0029] As mentioned in the background technology, the testing process of the automobile insulation detection circuit in the prior art is relatively complicated and costly. In order to solve the above problems, a typical embodiment of the present application provides a control method, device, computer-readable storage medium, processor and control system for an automobile insulation detection circuit.

[0030] According to an embodiment of the present application, a control method for an automobile insulation detection circuit is provided.

[0031] Figure 2 FIG. 1 is a flow chart of a method for controlling an automobile insulation detection circuit according to an embodiment of the present application. Figure 3 As shown, the automobile insulation detection circuit includes a first detection resistor R1, a second detection resistor R2, a first sampling resistor R3, a second sampling resistor R4, a first switch device K1, and a second switch device K2, wherein a first end of the first detection resistor R1 is electrically connected to a first end of the first switch device K1, a second end of the first detection resistor R1 is electrically connected to a first end of the first sampling resistor R3, a first end of the second detection resistor R2 is electrically connected to a first end of the second switch device K2, a second end of the second detection resistor R2 is electrically connected to a first end of the second sampling resistor R4, a second end of the first sampling resistor R3 and a second end of the second sampling resistor R4 are respectively electrically connected to a vehicle body, a second end of the first switch device K1 is electrically connected to one end of a battery of the vehicle, and a second end of the second switch device K2 is electrically connected to the other end of the battery. Figure 2 As shown, the method includes the following steps:

[0032] Step S101, obtaining a first voltage value and a second voltage value when the first switching device and the second switching device are closed, wherein the first voltage value is a voltage value at the second end of the first detection resistor, and the second voltage value is a voltage value at the second end of the second detection resistor;

[0033] Step S102: Control the first switching device or the second switching device to be turned off, and obtain a third voltage value. When the first switching device is turned off, the third voltage value is the voltage value of the second end of the second detection resistor. When the second switching device is turned off, the third voltage value is the voltage value of the second end of the first detection resistor.

[0034] Step S103 , determining the insulation resistance value according to the first voltage value, the second voltage value, and the third voltage value, where the insulation resistance is the resistance between the two ends of the battery of the vehicle.

[0035] In the control method for an automotive insulation detection circuit of the present application, first, a first voltage value and a second voltage value are obtained when a first switching device and a second switching device are closed. Then, the first switching device or the second switching device is controlled to be open to obtain a third voltage value. Finally, the insulation resistance of the vehicle is determined based on the first, second, and third voltage values. Compared to the complex and costly testing process of conventional automotive insulation detection circuits, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower detection costs. Furthermore, the control process of the detection circuit is relatively simple, ensuring the practicality of the detection circuit.

[0036] It should be noted that the interval time between closing the first switching device and the second switching device to obtain the first voltage value and the second voltage value, and controlling the first switching device or the second switching device to disconnect to obtain the third voltage value is relatively short, which can ensure that the current values ​​corresponding to the two acquisition processes remain basically unchanged.

[0037] In one embodiment of the present application, controlling the first switching device or the second switching device to be turned off and obtaining the third voltage value may include: after controlling both the first switching device and the second switching device to be turned off, controlling the first switching device or the second switching device to be turned on and obtaining the third voltage value. Of course, the process of controlling the first switching device or the second switching device to be turned off is not limited to the above process. In other embodiments, controlling the first switching device or the second switching device to be turned off may include: after obtaining the first voltage value and the second voltage value, controlling the first switching device or the second switching device to be turned off.

[0038] According to an embodiment of the present application, Figure 3As shown, the resistance values ​​of the first sampling resistor R3 and the second sampling resistor R4 are both less than a predetermined value, the first sampling resistor R3, the first detection resistor R1, and the first switch device K1 constitute a first branch, and the second sampling resistor R4, the second detection resistor R2, and the second switch device K1 constitute a second branch. The insulation resistance value of the vehicle is determined according to the first voltage value, the second voltage value, and the third voltage value, including: when the first voltage value and the second voltage value are both greater than a first predetermined voltage, determining that the insulation resistance includes a first equivalent resistor R in series. p And the second equivalent resistance R n , and the first equivalent resistance R p Connected in parallel at both ends of the first branch, the second equivalent resistor R n connected in parallel at both ends of the second branch; a fourth voltage value is obtained by subtracting the sum of the first voltage value and the second voltage value from the third voltage value; when the first switch device is disconnected, according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R n / / R2) / (R p ) and R=R p +R n , calculate the insulation resistance, where V1 is the first voltage, V2 is the second voltage, V3 is the third voltage, V4 is the fourth voltage, R1 is the resistance of the first detection resistor, R2 is the resistance of the second detection resistor, and R p is the resistance of the first equivalent resistor, R n is the resistance value of the second equivalent resistor, R is the resistance value of the insulation resistor; when the second switch device is disconnected, according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R1 / / R p ) / (R n ) and R=R p +R n, calculate the resistance value of the above insulation resistance. Since the resistance values ​​of the first sampling resistor and the second sampling resistor of the present application are both less than the predetermined value, both are small and can be ignored, that is, the influence of the resistance values ​​of the above first sampling resistor and the above second sampling resistor on the calculation results is not considered in the subsequent calculation process, further ensuring that the test process of the vehicle insulation resistance is relatively simple and easy; in addition, when the first voltage value and the second voltage value are both greater than the first predetermined voltage, it is determined that the vehicle has two insulation resistances, and the first branch and the second branch are respectively connected in parallel with these two equivalent resistances, indicating that the above detection method of the present application is applicable to the case where the insulation resistance of the vehicle is equivalent to two. According to the sum of the obtained first voltage value and the second voltage value, the fourth voltage value is obtained by subtracting it from the third voltage value, and then according to the above two formulas, the resistance value of the insulation resistance is solved. In the absence of the resistance interference of other auxiliary resistors, not only the detection algorithm is simplified, but also the accuracy of the obtained insulation resistance is further guaranteed to be high.

[0039] It should be noted that the second end of the first switching device is the first end of the first branch, the second end of the first sampling resistor is the second end of the first branch, and the first equivalent resistor is connected in parallel across the first branch, indicating that the first end of the first equivalent resistor is connected to the second end of the first switching device, and the second end of the first equivalent resistor is electrically connected to the second end of the first sampling resistor. Similarly, the second end of the second switching device is the first end of the second branch, the second end of the second sampling resistor is the second end of the second branch, and the second equivalent resistor is connected in parallel across the second branch, indicating that the first end of the second equivalent resistor is electrically connected to the second end of the second switching device, and the second end of the second equivalent resistor is electrically connected to the second end of the second sampling resistor.

[0040] In order to further ensure that the resistance value of the above-mentioned insulation resistance is obtained relatively simply and quickly, and further ensure that the testing cost is low, according to another embodiment of the present application, the resistance values ​​of the above-mentioned first sampling resistor and the above-mentioned second sampling resistor are both less than a predetermined value, the above-mentioned first sampling resistor, the above-mentioned first detection resistor and the above-mentioned first switching device constitute a branch, and the above-mentioned second sampling resistor, the above-mentioned second detection resistor and the above-mentioned second switching device constitute another branch. The resistance value of the above-mentioned insulation resistance of the above-mentioned vehicle is determined according to the above-mentioned first voltage value, the above-mentioned second voltage value and the above-mentioned third voltage value, including: when the above-mentioned first voltage value or the above-mentioned second voltage value is less than or equal to the first predetermined voltage, determining that the above-mentioned insulation resistance is connected in parallel at both ends of the above-mentioned branch corresponding to the target voltage, that is, the above-mentioned insulation resistance is only equivalent to an equivalent resistor, and the equivalent resistor is only connected in parallel at both ends of one branch, while there is no equivalent resistor at both ends of the other branch, which is equivalent to Figure 3 R in n and R pThere is only one, wherein the target voltage is the voltage value greater than the first predetermined voltage between the first voltage value and the second voltage value; the insulation resistance value is calculated according to V1 / V2=R / / R', wherein R is the insulation resistance, when the target voltage is the first voltage value, R' is the first detection resistance, and when the target voltage is the second voltage value, R' is the second detection resistance. Since the resistance values ​​of the first sampling resistor and the second sampling resistor of the present application are both less than the predetermined value, both are small and can be ignored, that is, the influence of the resistance values ​​of the first sampling resistor and the second sampling resistor on the calculation results is not considered in the subsequent calculation process, further ensuring that the test process of the vehicle insulation resistance is relatively simple and easy; in addition, the detection method of the present application can also more accurately determine the resistance value of the vehicle insulation resistance when the vehicle insulation resistance is equivalent to only one, further ensuring that the applicability of the detection method of the present application is strong.

[0041] To further ensure a wide range of applicability of the control method of the present application, according to another embodiment of the present application, after obtaining the third voltage value, the method further includes: obtaining a fourth voltage value by subtracting the third voltage value from the sum of the first voltage value and the second voltage value; obtaining a first difference value and a second difference value, wherein the first difference value is the difference between the first voltage value and the third voltage value, and the second difference value is the difference between the second voltage value and the fourth voltage value; determining whether the first difference value or the second difference value is less than or equal to a second predetermined voltage; and determining that a short circuit fault has occurred in the battery if the first difference value or the second difference value is less than or equal to the second predetermined voltage. Calculating a fourth voltage value by subtracting the sum of the first voltage value and the second voltage value from the third voltage value, and determining that a short circuit fault has occurred in the vehicle battery if the difference between the first voltage value and the third voltage value, or the difference between the second voltage value and the fourth voltage value, is less than the second predetermined voltage. In other words, the detection process of the present application can detect not only the insulation resistance value of the vehicle but also other circuit faults and system faults of the vehicle.

[0042] To further determine whether the vehicle's insulation circuit has failed, according to another embodiment of the present application, after obtaining the third voltage value, the method further includes: if the third voltage value is 0, determining that the insulation resistor is not connected to the battery terminals. If the third voltage value is 0, this indicates that if the first or second branch is broken, the circuit formed by the vehicle's battery and the insulation resistor is also disconnected, meaning that the insulation resistor is not connected to the battery terminals, and the battery current flows directly into the vehicle body.

[0043] According to another embodiment of the present application, controlling the first switching device or the second switching device to disconnect includes: controlling the second switching device to disconnect when the first voltage value is greater than or equal to the second voltage value; and controlling the first switching device to disconnect when the first voltage value is less than the second voltage value. The opening or closing of the first switching device or the second switching device is determined based on the magnitude of the first voltage value and the second voltage value. This application further ensures that the third voltage obtained in this process is relatively accurate by disconnecting the branch with a lower voltage, maintaining the passage of the branch with a higher voltage, and then obtaining a third voltage value for the branch with a higher voltage, thereby providing relatively accurate data support for subsequently obtaining a relatively accurate insulation resistance value.

[0044] In one embodiment, after obtaining the first and second voltage values, the method further includes: obtaining the sum of the first and second voltage values; and determining whether the difference between the sum and the total voltage value is within a preset range. If the difference is not within the preset range, determining that a voltage acquisition failure has occurred. This process, used to determine whether a voltage acquisition failure has occurred in an automotive insulation circuit, further ensures the strong applicability and wide range of applications of the control method of the present application.

[0045] In addition, with Figure 1 In comparison, the above control method of the present application can disconnect the automobile insulation detection circuit from the automobile battery by controlling the first switch device and the second switch device to close, thus solving the problem of Figure 1 The problem of medium and high voltage being directly connected to low voltage and unable to be disconnected ensures the safety of the detection process.

[0046] In one embodiment, 10-20 resistors are required in the insulation circuit of the prior art solution for auxiliary insulation detection. The production cost of these 10-20 resistors is about 5-10 yuan. After removing these auxiliary resistors in this application, it can save 250,000 to 500,000 yuan based on 50,000 sets per year. In addition, according to a large number of experiments, the insulation resistance calculated by the above-mentioned insulation circuit of this application is improved by 0.5% compared with the prior art, and most circuit faults and system fault problems can also be detected.

[0047] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0048] The present application also provides a control device for an automotive insulation detection circuit. It should be noted that the control device for an automotive insulation detection circuit according to the present application can be used to execute the control method for an automotive insulation detection circuit according to the present application. The following describes the control device for an automotive insulation detection circuit according to the present application.

[0049] Figure 4 Schematic diagram of a control device for an automotive insulation detection circuit according to an embodiment of the present application. Figure 3 As shown, the automobile insulation detection circuit includes a first detection resistor R1, a second detection resistor R2, a first sampling resistor R3, a second sampling resistor R4, a first switch device K1, and a second switch device K2, wherein a first end of the first detection resistor R1 is electrically connected to a first end of the first switch device K1, a second end of the first detection resistor R1 is electrically connected to a first end of the first sampling resistor R3, a first end of the second detection resistor R2 is electrically connected to a first end of the second switch device K2, a second end of the second detection resistor R2 is electrically connected to a first end of the second sampling resistor R4, a second end of the first sampling resistor R3 and a second end of the second sampling resistor R4 are respectively electrically connected to a vehicle body, a second end of the first switch device K1 is electrically connected to one end of a battery of the vehicle, and a second end of the second switch device K2 is electrically connected to the other end of the battery. Figure 4 As shown, the apparatus includes a first acquisition unit 10, a control unit 20, and a first determination unit 30, wherein the first acquisition unit 10 is used to acquire a first voltage value and a second voltage value when the first switching device and the second switching device are closed, the first voltage value being the voltage value of the second end of the first detection resistor, and the second voltage value being the voltage value of the second end of the second detection resistor; the control unit 20 is used to control the first switching device or the second switching device to be disconnected, and acquire a third voltage value, when the first switching device is disconnected, the third voltage value is the voltage value of the second end of the second detection resistor, and when the second switching device is disconnected, the third voltage value is the voltage value of the second end of the first detection resistor; the first determination unit 30 is used to determine the insulation resistance value according to the first voltage value, the second voltage value, and the third voltage value, the insulation resistance being the resistance of the vehicle connected to the battery at both ends.

[0050] In the control device for the automotive insulation detection circuit of the present application, a first acquisition unit acquires a first voltage value and a second voltage value when the first and second switching devices are closed. A control unit controls the first or second switching device to be opened to acquire a third voltage value. A first determination unit determines the insulation resistance of the vehicle based on the first, second, and third voltage values. Compared to conventional automotive insulation detection circuits, which often have complex testing processes and high costs, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower testing costs. Furthermore, the control process for the detection circuit is relatively simple, ensuring the practicality of the detection circuit.

[0051] It should be noted that the interval time between closing the first switching device and the second switching device to obtain the first voltage value and the second voltage value, and controlling the first switching device or the second switching device to disconnect to obtain the third voltage value is relatively short, which can ensure that the current values ​​corresponding to the two acquisition processes remain basically unchanged.

[0052] In one embodiment of the present application, the control unit includes a first control module, and the first control module is configured to control the first switching device and the second switching device to be turned off, and then control the first switching device or the second switching device to be turned on, and obtain a third voltage value. Of course, the process of controlling the first switching device or the second switching device to be turned off is not limited to the above process. In other embodiments, controlling the first switching device or the second switching device to be turned off may include: after obtaining the first voltage value and the second voltage value, controlling the first switching device or the second switching device to be turned off.

[0053] According to an embodiment of the present application, Figure 3 As shown, the resistance values ​​of the first sampling resistor R3 and the second sampling resistor R4 are both less than a predetermined value, the first sampling resistor R3, the first detection resistor R1 and the first switch device K1 constitute a first branch, the second sampling resistor R4, the second detection resistor R2 and the second switch device K1 constitute a second branch, and the first determination unit includes a first determination module, a second determination module, a first calculation module and a second calculation module, wherein the first determination module is used to determine that the insulation resistance includes a first equivalent resistance R in series when the first voltage value and the second voltage value are both greater than a first predetermined voltage. p And the second equivalent resistance R n , and the first equivalent resistance R p Connected in parallel at both ends of the first branch, the second equivalent resistor R nconnected in parallel at both ends of the second branch; the second determining module is used to obtain a fourth voltage value by subtracting the sum of the first voltage value and the second voltage value from the third voltage value; the first calculating module is used to obtain a fourth voltage value according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R n / / R2) / (R p ) and R=R p +R n , calculate the insulation resistance, where V1 is the first voltage, V2 is the second voltage, V3 is the third voltage, V4 is the fourth voltage, R1 is the resistance of the first detection resistor, R2 is the resistance of the second detection resistor, and R p is the resistance of the first equivalent resistor, R n is the resistance value of the second equivalent resistor, R is the resistance value of the insulation resistor; the second calculation module is used to calculate the value of the insulation resistor according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R1 / / R p ) / (R n ) and R=R p +R n , calculate the resistance value of the above insulation resistance. Since the resistance values ​​of the first sampling resistor and the second sampling resistor of the present application are both less than the predetermined value, both are small and can be ignored, that is, the influence of the resistance values ​​of the above first sampling resistor and the above second sampling resistor on the calculation results is not considered in the subsequent calculation process, further ensuring that the test process of the vehicle insulation resistance is relatively simple and easy; in addition, when the first voltage value and the second voltage value are both greater than the first predetermined voltage, it is determined that the vehicle has two insulation resistances, and the first branch and the second branch are respectively connected in parallel with these two equivalent resistances, indicating that the above detection method of the present application is applicable to the case where the insulation resistance of the vehicle is equivalent to two. According to the sum of the obtained first voltage value and the second voltage value, the fourth voltage value is obtained by subtracting it from the third voltage value, and then according to the above two formulas, the resistance value of the insulation resistance is solved. In the absence of the resistance interference of other auxiliary resistors, not only the detection algorithm is simplified, but also the accuracy of the obtained insulation resistance is further guaranteed to be high.

[0054] It should be noted that the second end of the first switching device is the first end of the first branch, the second end of the first sampling resistor is the second end of the first branch, and the first equivalent resistor is connected in parallel across the first branch, indicating that the first end of the first equivalent resistor is connected to the second end of the first switching device, and the second end of the first equivalent resistor is electrically connected to the second end of the first sampling resistor. Similarly, the second end of the second switching device is the first end of the second branch, the second end of the second sampling resistor is the second end of the second branch, and the second equivalent resistor is connected in parallel across the second branch, indicating that the first end of the second equivalent resistor is electrically connected to the second end of the second switching device, and the second end of the second equivalent resistor is electrically connected to the second end of the second sampling resistor.

[0055] In order to further ensure that the resistance value of the above-mentioned insulation resistance is obtained relatively simply and quickly, and further ensure that the testing cost is low, according to another embodiment of the present application, the resistance values ​​of the above-mentioned first sampling resistor and the above-mentioned second sampling resistor are both less than a predetermined value, the above-mentioned first sampling resistor, the above-mentioned first detection resistor and the above-mentioned first switching device constitute a branch, and the above-mentioned second sampling resistor, the above-mentioned second detection resistor and the above-mentioned second switching device constitute another branch. The above-mentioned first determination unit includes a third determination module and a third calculation module, wherein the above-mentioned third determination module is used to determine that the above-mentioned insulation resistance is connected in parallel at both ends of the above-mentioned branch corresponding to the target voltage when the above-mentioned first voltage value or the above-mentioned second voltage value is less than or equal to the first predetermined voltage. That is to say, the above-mentioned insulation resistance is only equivalent to an equivalent resistor, and the equivalent resistor is only connected in parallel at both ends of one branch, while there is no equivalent resistor at both ends of the other branch, which is equivalent to Figure 3 R in n and R p There is only one, wherein the target voltage is the voltage value greater than the first predetermined voltage between the first voltage value and the second voltage value; the third calculation module is used to calculate the resistance value of the insulation resistance according to V1 / V2=R / / R', wherein R is the insulation resistance, when the target voltage is the first voltage value, R' is the first detection resistance, and when the target voltage is the second voltage value, R' is the second detection resistance. Since the resistance values ​​of the first sampling resistor and the second sampling resistor of the present application are both less than the predetermined value, both are small and can be ignored, that is, the influence of the resistance values ​​of the first sampling resistor and the second sampling resistor on the calculation results is not considered in the subsequent calculation process, further ensuring that the test process of the vehicle insulation resistance is relatively simple and easy; in addition, the detection method of the present application can also more accurately determine the resistance value of the vehicle insulation resistance when the vehicle insulation resistance is equivalent to only one, further ensuring that the applicability of the detection method of the present application is strong.

[0056] In order to further ensure that the application scope of the control method of the present application is large, according to another embodiment of the present application, the above-mentioned device also includes a processing unit, a second acquisition unit, a second determination unit and a third determination unit, wherein the above-mentioned processing unit is used to obtain the fourth voltage value by subtracting the sum of the above-mentioned first voltage value and the above-mentioned second voltage value from the above-mentioned third voltage value after obtaining the third voltage value; the above-mentioned second acquisition unit is used to obtain the first difference and the second difference, wherein the above-mentioned first difference is the difference between the above-mentioned first voltage value and the above-mentioned third voltage value, and the above-mentioned second difference is the difference between the above-mentioned second voltage value and the above-mentioned fourth voltage value; the above-mentioned second determination unit is used to determine whether the above-mentioned first difference or the above-mentioned second difference is less than or equal to the second predetermined voltage; the above-mentioned third determination unit is used to determine that the above-mentioned battery has a short circuit fault when the above-mentioned first difference or the above-mentioned second difference is less than or equal to the above-mentioned second predetermined voltage. The fourth voltage value is calculated by subtracting the sum of the first voltage value and the second voltage value from the third voltage value. When the difference between the first voltage value and the third voltage value, or the difference between the second voltage value and the fourth voltage value, is less than the second predetermined voltage, it is determined that a short circuit fault has occurred in the battery of the vehicle. That is, in addition to detecting the insulation resistance value of the vehicle, the detection process of the present application can also detect other circuit faults and system faults of the vehicle.

[0057] To further determine whether the vehicle's insulation circuit has failed, according to another embodiment of the present application, the apparatus further includes a fourth determining unit configured to, after obtaining the third voltage value, determine that the insulation resistor is not connected to both ends of the battery if the third voltage value is 0. If the third voltage value is determined to be 0, this indicates that if the first or second branch is broken, the circuit formed by the vehicle's battery and the insulation resistor is also disconnected, meaning that the insulation resistor is not connected to both ends of the battery, and the battery current flows directly into the vehicle body.

[0058] According to another embodiment of the present application, the control unit includes a second control module and a third control module, wherein the second control module is used to control the second switch device to be disconnected when the first voltage value is greater than or equal to the second voltage value; and the third control module is used to control the first switch device to be disconnected when the first voltage value is less than the second voltage value. Based on the magnitude of the first voltage value and the second voltage value, the opening and closing of the first switch device or the second switch device is determined. The present application further ensures that the third voltage obtained in this process is relatively accurate by disconnecting the branch with a smaller voltage, maintaining the passage of the branch with a larger voltage, and then obtaining the third voltage value of the branch with a larger voltage, thereby providing relatively accurate data support for subsequently obtaining a relatively accurate insulation resistance value.

[0059] In one embodiment, the apparatus further includes a third acquisition unit and a fourth determination unit. The third acquisition unit is configured to, after acquiring the first and second voltage values, acquire the sum of the first and second voltage values. The fourth determination unit is configured to determine whether the difference between the sum and the total voltage value is within a preset range. If the difference is not within the preset range, a voltage acquisition failure is determined. Determining whether a voltage acquisition failure has occurred in an automotive insulation circuit through the above process further ensures the strong applicability and wide range of applications of the control method of the present application.

[0060] In addition, with Figure 1 In comparison, the control device of the present application can disconnect the automobile insulation detection circuit from the automobile battery by controlling the first switch device and the second switch device to close, thus solving the problem of Figure 1 The problem of medium and high voltage being directly connected to low voltage and unable to be disconnected ensures the safety of the detection process.

[0061] In one embodiment, 10-20 resistors are required in the insulation circuit of the prior art solution for auxiliary insulation detection. The production cost of these 10-20 resistors is about 5-10 yuan. After removing these auxiliary resistors in this application, it can save 250,000 to 500,000 yuan based on 50,000 sets per year. In addition, according to a large number of experiments, the insulation resistance calculated by the above-mentioned insulation circuit of this application is improved by 0.5% compared with the prior art, and most circuit faults and system fault problems can also be detected.

[0062] The control device of the above-mentioned automobile insulation detection circuit includes a processor and a memory. The above-mentioned first acquisition unit, the above-mentioned control unit unit and the above-mentioned first determination unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions.

[0063] The processor includes a core, which retrieves the corresponding program unit from the memory. One or more cores can be provided, and the core parameters can be adjusted to solve the problem of the complex and high cost of the existing automotive insulation detection circuit testing process.

[0064] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0065] An embodiment of the present invention provides a computer-readable storage medium having a program stored thereon. When the program is executed by a processor, the control method of the automobile insulation detection circuit is implemented.

[0066] An embodiment of the present invention provides a processor, which is used to run a program, wherein the control method of the automobile insulation detection circuit is executed when the program is run.

[0067] An embodiment of the present invention provides a device, comprising a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, at least the following steps are performed:

[0068] Step S101, obtaining a first voltage value and a second voltage value when the first switching device and the second switching device are closed, wherein the first voltage value is a voltage value at the second end of the first detection resistor, and the second voltage value is a voltage value at the second end of the second detection resistor;

[0069] Step S102: Control the first switching device or the second switching device to be turned off, and obtain a third voltage value. When the first switching device is turned off, the third voltage value is the voltage value of the second end of the second detection resistor. When the second switching device is turned off, the third voltage value is the voltage value of the second end of the first detection resistor.

[0070] Step S103 , determining the insulation resistance value according to the first voltage value, the second voltage value, and the third voltage value, where the insulation resistance is the resistance between the two ends of the battery of the vehicle.

[0071] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0072] The present application also provides a computer program product, which, when executed on a data processing device, is adapted to execute a program for initializing at least the following method steps:

[0073] Step S101, obtaining a first voltage value and a second voltage value when the first switching device and the second switching device are closed, wherein the first voltage value is a voltage value at the second end of the first detection resistor, and the second voltage value is a voltage value at the second end of the second detection resistor;

[0074] Step S102: Control the first switching device or the second switching device to be turned off, and obtain a third voltage value. When the first switching device is turned off, the third voltage value is the voltage value of the second end of the second detection resistor. When the second switching device is turned off, the third voltage value is the voltage value of the second end of the first detection resistor.

[0075] Step S103 , determining the insulation resistance value according to the first voltage value, the second voltage value, and the third voltage value, where the insulation resistance is the resistance between the two ends of the battery of the vehicle.

[0076] An embodiment of the present application further provides a control system, comprising an automobile insulation detection circuit and a control device for the automobile insulation detection circuit, wherein the automobile insulation detection circuit comprises a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device, wherein a first end of the first detection resistor is electrically connected to a first end of the first switching device, a second end of the first detection resistor is electrically connected to a first end of the first sampling resistor, a first end of the second detection resistor is electrically connected to a first end of the second switching device, a second end of the second detection resistor is electrically connected to a first end of the second sampling resistor, the second end of the first sampling resistor and the second end of the second sampling resistor are respectively configured to be electrically connected to a vehicle body, the second end of the first switching device is configured to be electrically connected to one end of a battery of the vehicle, and the second end of the second switching device is configured to be electrically connected to the other end of the battery; the control device for the automobile insulation detection circuit comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any one of the above-mentioned methods.

[0077] In the control system of the present application, the control device for the automotive insulation detection circuit includes one or more processors, memory, and one or more programs. The one or more programs include a method for executing any of the aforementioned control methods, first obtaining a first voltage value and a second voltage value when the first and second switching devices are closed; then controlling the first or second switching device to be open to obtain a third voltage value; and finally, determining the insulation resistance of the vehicle based on the first, second, and third voltage values. Compared to conventional automotive insulation detection circuits, which often have complex testing processes and high costs, the automotive insulation detection circuit of the present application utilizes fewer detection devices, resulting in lower testing costs. Furthermore, the control process for the detection circuit is simpler, ensuring the practicality of the detection circuit.

[0078] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the above-mentioned units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0080] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0081] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0082] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it 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 all or 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 and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0083] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0084] 1) In the control method of the automotive insulation detection circuit of the present application, first, a first voltage value and a second voltage value are obtained when the first and second switching devices are closed. Then, the first or second switching device is controlled to be open to obtain a third voltage value. Finally, the insulation resistance of the vehicle is determined based on the first, second, and third voltage values. Compared to the complex and costly testing process of automotive insulation detection circuits in the prior art, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower detection costs. Furthermore, the control process of the detection circuit is relatively simple, ensuring the practicality of the detection circuit.

[0085] 2) In the control device for the automotive insulation detection circuit of the present application, a first acquisition unit acquires a first voltage value and a second voltage value when the first and second switching devices are closed. A control unit controls the first or second switching device to be opened to acquire a third voltage value. A first determination unit determines the insulation resistance of the vehicle based on the first, second, and third voltage values. Compared to the complex and costly testing process of automotive insulation detection circuits in the prior art, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower detection costs and a simpler control process for the detection circuit, ensuring the greater practicality of the detection circuit.

[0086] 3) In the control system of the present application, the control device for the automotive insulation detection circuit includes one or more processors, memory, and one or more programs, wherein the one or more programs include means for executing any of the aforementioned control methods, first obtaining a first voltage value and a second voltage value when the first and second switching devices are closed; then controlling the first or second switching device to be open to obtain a third voltage value; and finally, determining the insulation resistance of the vehicle based on the first, second, and third voltage values. Compared to conventional automotive insulation detection circuits, which suffer from complex testing processes and high costs, the automotive insulation detection circuit of the present application uses fewer detection devices, resulting in lower testing costs. Furthermore, the control process for the detection circuit is simpler, ensuring the practicality of the detection circuit.

[0087] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A control method for an automotive insulation detection circuit, wherein the automotive insulation detection circuit comprises a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device, wherein: A first end of the first detection resistor is electrically connected to a first end of the first switching device, a second end of the first detection resistor is electrically connected to a first end of the first sampling resistor, a first end of the second detection resistor is electrically connected to a first end of the second switching device, a second end of the second detection resistor is electrically connected to a first end of the second sampling resistor, a second end of the first sampling resistor and a second end of the second sampling resistor are respectively electrically connected to a vehicle body, a second end of the first switching device is electrically connected to one end of a battery of the vehicle, and a second end of the second switching device is electrically connected to the other end of the battery. The method includes: When the first switch device and the second switch device are closed, obtaining a first voltage value and a second voltage value, wherein the first voltage value is a voltage value of the second end of the first detection resistor, and the second voltage value is a voltage value of the second end of the second detection resistor; controlling the first switching device or the second switching device to be turned off, and obtaining a third voltage value, where when the first switching device is turned off, the third voltage value is the voltage value of the second end of the second detection resistor; and when the second switching device is turned off, the third voltage value is the voltage value of the second end of the first detection resistor; The resistance values ​​of the first sampling resistor and the second sampling resistor are both smaller than a predetermined value. The first sampling resistor, the first detection resistor, and the first switch device constitute a first branch. The second sampling resistor, the second detection resistor, and the second switch device constitute a second branch. When both the first voltage value and the second voltage value are greater than a first predetermined voltage, determining that the insulation resistance includes a first equivalent resistance and a second equivalent resistance connected in series, wherein the first equivalent resistance is connected in parallel across the first branch, and the second equivalent resistance is connected in parallel across the second branch, and the insulation resistance is the resistance of the vehicle connected across the battery; Obtaining a fourth voltage value by subtracting the third voltage value from the sum of the first voltage value and the second voltage value; When the first switching device is turned off, according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R n / / R2) / (R p ) and R=R p +R n , calculate the insulation resistance, where V1 is the first voltage value, V2 is the second voltage value, V3 is the third voltage value, V4 is the fourth voltage value, R1 is the resistance value of the first detection resistor, R2 is the resistance value of the second detection resistor, R p is the resistance of the first equivalent resistor, R n is the resistance of the second equivalent resistor, and R is the resistance of the insulation resistor; When the second switching device is turned off, according to V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R1 / / R p ) / (R n ) and R=R p +R n , calculate the insulation resistance value, When the first voltage value or the second voltage value is less than or equal to a first predetermined voltage, determining that the insulation resistance is connected in parallel across the branch corresponding to a target voltage, wherein the target voltage is a voltage value between the first voltage value and the second voltage value that is greater than the first predetermined voltage; The insulation resistance is calculated according to V1 / V2=R / / R', where R is the insulation resistance, R' is the first detection resistance when the target voltage is the first voltage value, and R' is the second detection resistance when the target voltage is the second voltage value.

2. The method according to claim 1, characterized in that After obtaining the third voltage value, the method further includes: Obtaining a fourth voltage value by subtracting the third voltage value from the sum of the first voltage value and the second voltage value; Obtaining a first difference and a second difference, wherein the first difference is a difference between the first voltage value and the third voltage value, and the second difference is a difference between the second voltage value and the fourth voltage value; determining whether the first difference or the second difference is less than or equal to a second predetermined voltage; When the first difference or the second difference is less than or equal to the second predetermined voltage, it is determined that a short circuit fault occurs in the battery.

3. The method according to claim 1, characterized in that After obtaining the third voltage value, the method further includes: When the third voltage value is 0, it is determined that the insulation resistor is not connected to both ends of the battery.

4. The method according to claim 1, wherein Controlling the first switching device or the second switching device to be turned off includes: When the first voltage value is greater than or equal to the second voltage value, controlling the second switching device to be turned off; When the first voltage value is less than the second voltage value, the first switching device is controlled to be turned off.

5. A control device for an automobile insulation detection circuit, the automobile insulation detection circuit comprising a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device, wherein: The first end of the first detection resistor is electrically connected to the first end of the first switching device, the second end of the first detection resistor is electrically connected to the first end of the first sampling resistor, the first end of the second detection resistor is electrically connected to the first end of the second switching device, the second end of the second detection resistor is electrically connected to the first end of the second sampling resistor, the second end of the first sampling resistor and the second end of the second sampling resistor are respectively electrically connected to the body of the vehicle, the second end of the first switching device is electrically connected to one end of the battery of the vehicle, and the second end of the second switching device is electrically connected to the other end of the battery. The device includes: a first acquiring unit, configured to acquire a first voltage value and a second voltage value when the first switching device and the second switching device are closed, wherein the first voltage value is a voltage value of the second end of the first detection resistor, and the second voltage value is a voltage value of the second end of the second detection resistor; a control unit, controlling the first switching device or the second switching device to be turned off, and obtaining a third voltage value, where when the first switching device is turned off, the third voltage value is the voltage value of the second end of the second detection resistor; and when the second switching device is turned off, the third voltage value is the voltage value of the second end of the first detection resistor; A first determining unit determines an insulation resistance value according to the first voltage value, the second voltage value, and the third voltage value, wherein the insulation resistance is a resistance between two terminals of the vehicle connected to the battery. The resistance values ​​of the first sampling resistor and the second sampling resistor are both smaller than a predetermined value. The first sampling resistor, the first detection resistor, and the first switch device constitute a first branch. The second sampling resistor, the second detection resistor, and the second switch device constitute a second branch. The first determining unit includes: a first determining module, configured to, when both the first voltage value and the second voltage value are greater than a first predetermined voltage, determine that the insulation resistance includes a first equivalent resistance and a second equivalent resistance connected in series, wherein the first equivalent resistance is connected in parallel across the first branch, and the second equivalent resistance is connected in parallel across the second branch; a second determining module, configured to obtain a fourth voltage value by subtracting the third voltage value from the sum of the first voltage value and the second voltage value; The first calculation module is used to calculate the value of V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R n / / R2) / (R p ) and R=R p +R n , calculate the insulation resistance, where V1 is the first voltage value, V2 is the second voltage value, V3 is the third voltage value, V4 is the fourth voltage value, R1 is the resistance value of the first detection resistor, R2 is the resistance value of the second detection resistor, R p is the resistance of the first equivalent resistor, R n is the resistance of the second equivalent resistor, and R is the resistance of the insulation resistor; The second calculation module is used for calculating the value of V1 / V2=(R1 / / R p ) / (R2 / / R n )、V3 / V4=(R1 / / R p ) / (R n ) and R=R p +R n , calculate the insulation resistance value, a third determining module, configured to determine, when the first voltage value or the second voltage value is less than or equal to a first predetermined voltage, that the insulation resistor is connected in parallel across a branch corresponding to a target voltage, wherein the target voltage is a voltage value between the first voltage value and the second voltage value that is greater than the first predetermined voltage; a third calculation module, configured to calculate the insulation resistance according to V1 / V2=R / / R', where R is the insulation resistance, when the target voltage is the first voltage value, R' is the first detection resistance, and when the target voltage is the second voltage value, R' is the second detection resistance.

6. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 4.

7. A processor, characterized in that: The processor is configured to run a program, wherein the program executes the method according to any one of claims 1 to 4 when running.

8. A control system, characterized in that: include: An automobile insulation detection circuit includes a first detection resistor, a second detection resistor, a first sampling resistor, a second sampling resistor, a first switching device, and a second switching device, wherein a first end of the first detection resistor is electrically connected to a first end of the first switching device, a second end of the first detection resistor is electrically connected to a first end of the first sampling resistor, a first end of the second detection resistor is electrically connected to a first end of the second switching device, a second end of the second detection resistor is electrically connected to a first end of the second sampling resistor, the second end of the first sampling resistor and the second end of the second sampling resistor are respectively electrically connected to a vehicle body, a second end of the first switching device is electrically connected to one end of a battery of the vehicle, and a second end of the second switching device is electrically connected to the other end of the battery; The control device of the automobile insulation detection circuit includes one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the method according to any one of claims 1 to 4.

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