Fault detection system and vehicle

Abstract

The invention provides a fault detection system and a vehicle, and relates to the technical field of vehicles, the system is applied to a high-voltage interlocking loop with N detection connectors, the system comprises a controller, a decoder and N switch modules, the N detection connectors are sequentially connected in series, the N switch modules are electrically connected with the N detection connectors in a one-to-one correspondence mode, N is greater than or equal to 2, and N is greater than or equal to 1. The controller inputs a detection signal to each switch module and inputs a control signal to the decoder when determining that a fault detection connector exists in the N detection connectors, and the decoder controls each switch module to be switched on according to the control signal, so that each switch module inputs the detection signal to the detection connector connected with each switch module. And the controller judges whether the detection signal returned by the detection connector connected with each switch module is received or not so as to judge whether the detection connector connected with each switch module fails or not. According to the invention, the specific position of the fault can be accurately positioned under the condition that the high-voltage interlocking loop has the fault.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more particularly, to a fault detection system and a vehicle in the field of vehicle technology. Background Art

[0002] With the development of new energy vehicles, electrification has gradually become a trend. Electric vehicles are usually equipped with high-voltage electrical systems, which are used to power high-power electrical equipment (such as motors) in the vehicle. In order to detect the working status of the high-voltage electrical system in real time, a high-voltage interlock (High Voltage Interlock Loop, HVIL) system is usually installed in the vehicle. The high-voltage interlock system is equipped with multiple high-voltage connectors and corresponding low-voltage detection connectors. Each high-voltage connector usually has an interlocking contact, which is connected to a complete high-voltage interlocking circuit through wires. The high-voltage interlocking system can cut off the high-voltage power supply in time when the high-voltage electrical system is abnormal, thereby preventing electric shock accidents and fire risks.

[0003] The high-voltage interlocking system of the related art is usually also provided with a high-voltage interlocking detection circuit and a control system. Once the high-voltage interlocking detection circuit detects that the high-voltage interlocking circuit is disconnected, it will immediately send a signal to the control system, so that the control system cuts off the high-voltage output of all loads to ensure safety. However, the high-voltage interlocking detection circuit in the related art cannot accurately detect the specific location where the high-voltage interlocking circuit is disconnected, resulting in low efficiency in troubleshooting the high-voltage interlocking system. Summary of the invention

[0004] The present application provides a fault detection system and a vehicle. The embodiments of the present application can accurately locate the specific location of the fault when a fault occurs in a high-voltage interlocking circuit.

[0005] In a first aspect, a fault detection system is provided, which is applied to a high-voltage interlocking circuit having N detection connectors, wherein the N detection connectors are connected in series in sequence, and N≥2. The fault detection system comprises: N switch modules, a decoder and a controller, wherein the N switch modules are electrically connected to the N detection connectors in a one-to-one correspondence, the decoder is electrically connected to the controller, and both the decoder and the controller are electrically connected to the N switch modules; the controller is used to input a first detection signal to each switch module and a first decoder control signal to the decoder when it is determined that there is a faulty detection connector among the N detection connectors; the decoder is used to control the switch module to be turned on according to the first decoder control signal, so that the switch module inputs the first detection signal to a target detection connector; wherein the target detection connector is a detection connector connected to the switch module; and the controller is used to determine whether the target detection connector returns the first detection signal to the controller through the switch module, so as to determine whether the target detection connector is faulty.

[0006] Based on the above technical solution, the multiple switch modules, decoders and controllers in a fault detection system provided by the present application work together to realize real-time fault detection of the high-voltage interlocking circuit. The system adopts a one-by-one detection mechanism and feedback mechanism to ensure that the status of each detection connector in the high-voltage interlocking circuit can be accurately judged, and realizes the accurate positioning of the specific location of the fault when a fault occurs in the high-voltage interlocking circuit, which is conducive to timely reporting of the fault location.

[0007] In a possible implementation, the controller is used to input a second decoder control signal to the decoder and a second detection signal to the first switch module when a fault detection condition is met; the decoder is used to control the first switch module and the Nth switch module to be turned on, and control the second switch module to the N-1th switch module to be turned off according to the second decoder control signal, so that the first switch module inputs the second detection signal to the first detection connector; the controller is used to determine whether the Nth detection connector returns the second detection signal to the controller through the Nth switch module, so as to determine whether there is a faulty detection connector among the N detection connectors; wherein the fault detection condition includes: the controller receives a fault detection instruction and / or the interval duration instructing the controller to perform fault detection on the high-voltage interlocking circuit is reached.

[0008] In a possible implementation, the controller includes a first output port, a first input port, and a control port; the decoder includes a second input port and N second output ports; each second output port of the decoder corresponds to a switch module; for each switch module and each detection connector, the switch module includes a third input port, a third output port, a fourth input port, a fourth output port, a controlled port, and a power port; the detection connector includes a fifth input port and a fifth output port; for any two adjacent detection connectors included in the N detection connectors, the fifth output port of the first detection connector corresponds to the fifth output port of the second detection connector. the first output port of the controller is electrically connected to the third input port of the switch module, the third output port of the switch module is electrically connected to the fifth input port of the detection connector, the fifth output port of the detection connector is electrically connected to the fourth input port of the switch module, the fourth output port of the switch module is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input port of the decoder, the controlled port of the switch module is electrically connected to the second output port corresponding to the switch module, and the power port of the switch module is connected to a power supply.

[0009] In a possible implementation, the decoder includes a first decoder and a second decoder, the switch module includes a first optocoupler and a second optocoupler, and the controlled port of the switch module includes a first controlled port and a second controlled port; the anode of the first optocoupler and the anode of the second optocoupler are both electrically connected to the power port of the switch module; the collector of the first optocoupler is the third input port of the switch module, and the collector of the first optocoupler is electrically connected to the first output port of the controller; the emitter of the first optocoupler is the third output port of the switch module, and the emitter of the first optocoupler is electrically connected to the fifth input port of the detection connector; the cathode of the first optocoupler is the first controlled port of the switch module, and the The cathode of the first optocoupler is electrically connected to the second output port corresponding to the switch module in the first decoder; the collector of the second optocoupler is the fourth input port of the switch module, and the collector of the second optocoupler is electrically connected to the fifth output port of the detection connector; the emitter of the second optocoupler is the fourth output port of the switch module, and the emitter of the second optocoupler is electrically connected to the first input port of the controller; the cathode of the second optocoupler is the second controlled port of the switch module, and the cathode of the second optocoupler is electrically connected to the second output port corresponding to the switch module in the second decoder; the second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller.

[0010] In a possible implementation, an anode of the first optical coupler and an anode of the second optical coupler are both electrically connected to a power port of the switch module through a resistor.

[0011] In a possible implementation, the resistor includes a first resistor and a second resistor, the anode of the first photocoupler is electrically connected to the power port of the switch module through the first resistor, and the anode of the second photocoupler is electrically connected to the power port of the switch module through the second resistor.

[0012] In a possible implementation, the decoder includes a first decoder and a second decoder, the switch module includes a first relay and a second relay, and the controlled port of the switch module includes a first controlled port and a second controlled port; the first contact pin of the first relay is the third input port of the switch module, and the first contact pin of the first relay is electrically connected to the first output port of the controller; the second contact pin of the first relay is the third output port of the switch module, and the second contact pin of the first relay is electrically connected to the fifth input port of the detection connector; the first contact pin of the second relay is the fourth input port of the switch module, and the first contact pin of the second relay is electrically connected to the fifth output port of the detection connector; The second contact pin of the relay is the fourth output port of the switch module, and the second contact pin of the second relay is electrically connected to the first input port of the controller; the first coil pin of the first relay is the first controlled port of the switch module, and the first coil pin of the first relay is electrically connected to the second output port in the first decoder; the first coil pin of the second relay is the second controlled port of the switch module, and the first coil pin of the second relay is electrically connected to the second output port in the second decoder; the second coil pin of the first relay and the second coil pin of the second relay are both electrically connected to the power port of the switch module; the second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller.

[0013] In a possible implementation, the fault detection system further includes a redundant decoder and a redundant switch module; the redundant decoder is electrically connected to the controller via the redundant switch module, and the redundant decoder is electrically connected to the N switch modules.

[0014] In a possible implementation, the fault detection system further includes a redundant controller; the redundant controller is respectively connected to the controller and the N switch modules, and the redundant controller is electrically connected to the redundant decoder through the redundant switch module.

[0015] In a second aspect, a vehicle is provided, comprising: a high-voltage interlocking circuit and the above-mentioned fault detection system, wherein the high-voltage interlocking circuit is provided with a plurality of detection connectors, and the fault detection system is electrically connected to the plurality of detection connectors.

[0016] Based on the above technical solution, the vehicle can not only detect whether the high-voltage interlocking circuit is faulty, but also accurately locate the fault source when the high-voltage interlocking circuit fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 An exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown;

[0018] Figure 2 Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown;

[0019] Figure 3 Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown;

[0020] Figure 4 An exemplary connection diagram between a controller and a decoder provided in an embodiment of the present application is shown;

[0021] Figure 5 Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown;

[0022] Figure 6 An exemplary schematic diagram of a vehicle provided by the present application is shown. DETAILED DESCRIPTION

[0023] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0025] With the development of new energy vehicles, electrification has gradually become a trend. Electric vehicles are usually equipped with high-voltage electrical systems, which are used to power high-power electrical equipment (such as motors) in the vehicle. In order to detect the working status of the high-voltage electrical system in real time, a high-voltage interlocking system is usually installed in the vehicle. The high-voltage interlocking system is provided with multiple high-voltage connectors and corresponding low-voltage detection connectors. Each high-voltage connector usually has an interlocking contact, which are connected into a complete high-voltage interlocking circuit through wires. The high-voltage interlocking system can cut off the high-voltage power supply in time when the high-voltage electrical system is abnormal, thereby preventing electric shock accidents and fire risks.

[0026] The high-voltage interlocking system of the related art is usually also provided with a high-voltage interlocking detection circuit and a control system. Once the high-voltage interlocking detection circuit detects that the high-voltage interlocking circuit is disconnected, it will immediately send a signal to the control system, so that the control system cuts off the high-voltage output of all loads to ensure safety. However, the high-voltage interlocking detection circuit in the related art cannot accurately detect the specific location where the high-voltage interlocking circuit is disconnected, resulting in low efficiency in troubleshooting the high-voltage interlocking system.

[0027] Based on the above problems, an embodiment of the present application provides a fault detection system and a vehicle. The embodiment of the present application can not only detect whether there is a fault in the high-voltage interlocking circuit, but also accurately locate the specific location of the fault when there is a fault in the high-voltage interlocking circuit.

[0028] The following is an embodiment of a fault detection system provided in the specification of this application.

[0029] Figure 1 An exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown in FIG. Figure 1 As shown, the fault detection system 100 provided in the embodiment of the present application is applied to a high-voltage interlock circuit 200, and the high-voltage interlock circuit 200 includes a plug assembly 140, and the plug assembly 140 includes N detection connectors, that is, detection connector 1-detection connector N, N ≥ 2. The detection connector is specifically a low-voltage detection connector, which is installed on the high-voltage connector and is used to connect the high-voltage component.

[0030] The fault detection system 100 includes: a controller 110, a decoder 120 and a switch assembly 130. The switch assembly 130 includes N switch modules, namely, switch module 1 to switch module N. The decoder 120 is electrically connected to the controller 110, and the decoder 120 and the controller 110 are both electrically connected to the N switch modules. The N detection connectors are sequentially connected in series, and the N switch modules are electrically connected to the N detection connectors in a one-to-one correspondence. For example, switch module 1 is electrically connected to detection connector 1, switch module 2 is electrically connected to detection connector 2, ..., and switch module N is electrically connected to detection connector N.

[0031] based on Figure 1 According to the circuit connection relationship in the fault detection system 100, the hardware in the fault detection system 100 can form a first loop and N second loops. The specific connection of the first loop is: controller 110-switch module 1-detection connector 1-detection connector 2-...detection connector N-switch module N-controller 110. Each second loop in the N second loops is represented as a second loop Li, and the specific connection of the second loop Li is: controller 110-switch module Ki-detection connector Ci-controller 110, switch module Ki represents each switch module in the N switch modules, and detection connector Ci is the detection connector corresponding to the switch module Ki in the N detection connectors. For example, the specific connection of the first second loop is: controller 110-switch module 1-detection connector 1-controller 110.

[0032] When there is a faulty detection connector among the N detection connectors, the controller can perform relevant control to locate which detection connector among the N detection connectors the fault occurs. The process of the controller locating the faulty detection connector is as follows:

[0033] When the controller determines that there is a faulty detection connector among the N detection connectors, for each switch module Ki, the controller inputs a first detection signal to the switch module Ki and a first decoder control signal to the decoder; after receiving the first decoder control signal, the decoder controls the switch module Ki to conduct according to the first decoder control signal, so that the switch module Ki inputs the first detection signal to the target detection connector; the controller determines whether the target detection connector returns the first detection signal to the controller through the switch module Ki, so as to determine whether the target detection connector is faulty. The first detection signal is, for example, a PWM signal, and when the controller detects that the first circuit is not conducting, the controller determines that there is a faulty detection connector among the N detection connectors; the target detection connector is the detection connector connected to the switch module, that is, the detection connector Ci.

[0034] Specifically, after the switch module Ki is turned on, if the detection connector Ci has no fault, the first detection signal will be returned to the controller through the switch module Ki, indicating that the second circuit Li is turned on, and the controller will determine that the detection connector Ci has returned the first detection signal to the controller through the switch module Ki, and the controller determines that the detection connector Ci has no fault; if the detection connector Ci has a fault, the first detection signal will not be returned to the controller through the switch module Ki, indicating that the second circuit Li is not turned on, and the controller will determine that the detection connector Ci has not returned the first detection signal to the controller through the switch module Ki, and the controller determines that the detection connector Ci has a fault, that is, the detection connector Ci with a fault is located among the N detection connectors. Among them, a preset time length can be set, and the controller receives the first detection signal within the preset time length, indicating that the detection connector Ci has no fault; the controller does not receive the first detection signal within the preset time length, indicating that the detection connector Ci has a fault.

[0035] For example, to determine whether the detection connector 1 fails, the controller inputs a first detection signal to the switch module 1 and a first decoder control signal to the decoder when determining that there is a faulty detection connector among the N detection connectors; after receiving the first decoder control signal, the decoder controls the switch module 1 to be turned on according to the first decoder control signal, so that the switch module 1 inputs the first detection signal to the detection connector 1, and the controller determines whether the detection connector 1 returns the first detection signal to the controller through the switch module 1. If the controller determines that the detection connector 1 returns the first detection signal to the controller through the switch module 1, it indicates that the first second circuit is turned on and the detection connector 1 is not faulty; if the controller determines that the detection connector 1 does not return the first detection signal to the controller through the switch module 1, it indicates that the first second circuit is turned on and the detection connector 1 is faulty, and the faulty detection connector among the N detection connectors is located as the detection connector.

[0036] The process of determining whether each of the detection connectors 2 to N fails is the same as the process of determining whether the detection connector 1 fails, and will not be described in detail in the embodiment of the present application.

[0037] The multiple switch modules, decoders and controllers in a fault detection system provided by the present application work together to realize real-time fault detection of the high-voltage interlocking circuit. The system adopts a one-by-one detection mechanism and feedback mechanism to ensure that the status of each detection connector in the high-voltage interlocking circuit can be accurately judged, and realizes accurate positioning of the specific location of the fault when a fault occurs in the high-voltage interlocking circuit, which is conducive to timely reporting of the fault location.

[0038] In a possible implementation, the process of the fault detection system determining whether the first circuit is conductive is as follows:

[0039] When the controller determines that the fault detection condition is met, the controller inputs a second decoder control signal to the decoder and a second detection signal to the first switch module, the second detection signal being, for example, a PWM signal; after receiving the second decoder control signal, the decoder controls the first switch module and the Nth switch module to be turned on according to the second decoder control signal, and controls the second switch module to the N-1th switch module to be turned off, so that the first switch module inputs the second detection signal to the first detection connector; the controller further determines whether the Nth detection connector returns the second detection signal to the controller through the Nth switch module, so as to determine whether there is a faulty detection connector among the N detection connectors. The fault detection condition includes the controller receiving a fault detection instruction and / or the arrival of the interval time for instructing the controller to perform fault detection on the high-voltage interlocking circuit.

[0040] Specifically, if none of the N detection connectors fails, when the first switch module and the Nth switch module are turned on, the first loop is turned on, and the second detection signal will be returned to the controller through the first switch module, the second detection connector, ..., the Nth detection connector, and the Nth switch module in sequence, that is, the controller will determine that the Nth detection connector returns the second detection signal to the controller through the Nth switch module, indicating that the controller receives the returned second detection signal, thereby determining that there is no faulty detection connector among the N detection connectors, that is, none of the N detection connectors fails. If there is a faulty detection connector among the N detection connectors, when the first switch module and the Nth switch module are turned on, the first loop will not be turned on, and the controller will determine that the Nth detection connector does not return the second detection signal to the controller through the Nth switch module, indicating that the controller does not receive the returned second detection signal, thereby determining that there is no faulty detection connector among the N detection connectors.

[0041] The fault detection system provided in the embodiment of the present application can not only detect whether a high-voltage interlocking circuit is faulty, but also accurately locate the fault source when a fault occurs in the high-voltage interlocking circuit.

[0042] In one possible implementation, Figure 2 Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown in FIG. Figure 2As shown, the controller 110 includes a first output port, a first input port and a control port, the decoder 120 includes a second input port and N second output ports, and each second output port of the decoder 120 corresponds to a switch module. For each switch module Ki and each detection connector Ci, the switch module Ki includes a third input port, a third output port, a fourth input port, a fourth output port, a controlled port and a power port, and the detection connector Ci includes a fifth input port and a fifth output port.

[0043] Figure 2 Among them, M1 represents the first output port of the controller, M2 represents the first input port of the controller, M3 represents the control port of the controller, Xi represents the second input port of the decoder, Y1-YN represent the N second output ports of the decoder, G11 represents the third input port of the control module, G12 represents the third output port of the control module, G21 represents the fourth input port of the control module, G22 represents the fourth output port of the control module, G30 represents the controlled port of the control module, G40 represents the power port of the control module, J1 represents the fifth input port of the detection connector, J2 represents the fifth output port of the detection connector, and VCC represents the power supply.

[0044] For any two adjacent detection connectors included in the N detection connectors, the fifth output port of the previous detection connector is connected to the fifth input port of the next detection connector. For example, the fifth output port of the first detection connector is connected to the fifth input port of the second detection connector, the fifth output port of the second detection connector is connected to the fifth input port of the third detection connector, and so on.

[0045] For each switch module Ki and each detection connector Ci, the first output port of the controller is electrically connected to the third input port of the switch module Ki, the third output port of the switch module Ki is electrically connected to the fifth input port of the detection connector Ci, the fifth output port of the detection connector Ci is electrically connected to the fourth input port of the switch module Ki, the fourth output port of the switch module Ki is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input port of the decoder, the controlled port of the switch module Ki is electrically connected to the second output port corresponding to the switch module Ki, and the power port of the switch module Ki is connected to the power supply.

[0046] For example, the first output port of the controller is electrically connected to the third input port of the switch module 1, the third output port of the switch module 1 is electrically connected to the fifth input port of the detection connector 1, the fifth output port of the detection connector 1 is electrically connected to the fourth input port of the switch module 1, the fourth output port of the switch module 1 is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input port of the decoder, the controlled port of the switch module 1 is electrically connected to the second output port Y1 corresponding to the switch module 1, and the power port of the switch module 1 is connected to the power supply; the first output port of the controller is electrically connected to the third input port of the switch module 2, the third output port of the switch module 2 is electrically connected to the fifth input port of the detection connector 2, the fifth output port of the detection connector 2 is electrically connected to the fourth input port of the switch module 2, the fourth output port of the switch module 2 is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input port of the decoder, the controlled port of the switch module 2 is electrically connected to the second output port Y2 corresponding to the switch module 2, and the power port of the switch module 2 is connected to the power supply; and so on, it can be obtained Figure 2 The connection relationship shown in .

[0047] based on Figure 2 In the connection relationship, the specific connection of the first loop is: the first output port of the controller-the third input port of the switch module 1-the third output port of the switch module 1-the fifth input port of the detection connector 1-the fifth output port of the detection connector 1-the fifth input port of the detection connector 2-the fifth output port of the detection connector 2-...-the fifth output port of the detection connector N--the fourth input port of the switch module N-the fourth input port of the switch module N-the first input port of the controller. Among the N second loops, the specific connection of the first second loop is: the first output port of the controller-the third input port of the switch module 1-the third output port of the switch module 1-the fifth input port of the detection connector 1-the fifth output port of the detection connector 1-the fourth input port of the switch module 1-the fourth input port of the switch module 1-the first input port of the controller. The specific connections of the second second loop to the Nth second loop are the same as the specific connections of the first second loop, and the embodiments of the present application will not be repeated.

[0048] based on Figure 2 The process of the controller judging whether there is a faulty detection connector among the N detection connectors is as follows:

[0049] When the controller determines that the fault detection condition is met, the controller inputs a second decoder control signal to the second input port of the decoder through the control port of the controller, and inputs a second detection signal to the third input port of the first switch module through the first output port of the controller; after receiving the second decoder control signal, the decoder outputs a switch conduction signal through the second output port Y1 corresponding to the first switch module in the decoder, and outputs a switch conduction signal through the second output port YN corresponding to the Nth switch module in the decoder, so as to control the first switch module and the Nth switch module to be turned on, that is, the switch module 1 and the switch module N are both turned on, and the switch module 2 is turned on through the second output port Y1 corresponding to the second switch module in the decoder. The second output port corresponding to the switch module to the N-1th switch module outputs a switch disconnection signal, that is, Y2-Y(N-1) all output switch disconnection signals to control the second switch module to the N-1th switch module to be disconnected, that is, switch module 2-switch module N-1 are all disconnected, so that the second detection signal is input to the fifth input port of the first detection connector through the third output port of the first switch module, that is, the second detection signal is input to the fifth input port of the detection connector 1 through the third output port of switch module 1; the controller determines whether the first input port of the controller receives the second detection signal to determine whether there is a faulty detection connector among the N detection connectors. If the controller determines that the first input port of the controller receives the second detection signal, indicating that the first circuit is connected, then it is determined that none of the N detection connectors has a fault; if the controller determines that the first input port of the controller does not receive the second detection signal, indicating that the first circuit is not connected, then it is determined that there is a faulty detection connector among the N detection connectors.

[0050] based on Figure 2 The process of the controller locating the faulty detection connector among N detection connectors is as follows:

[0051] For each second loop Li, when the controller determines that there is a faulty detection connector among the N detection connectors, the controller inputs a first detection signal to the third input port of the switch module Ki through the first output port of the controller, and inputs a first decoder control signal to the second input port of the decoder through the control port of the controller; after the decoder receives the first decoder control signal, it outputs a switch conduction signal through the second output port corresponding to the switch module Ki in the decoder to control the switch module Ki to conduct; when the switch module Ki is conducted, the first detection signal is input to the fifth input port of the detection connector Ci through the third output port of the switch module Ki; the controller determines whether the first input port of the controller receives the first detection signal to determine whether the detection connector Ci is faulty. If the controller determines that the first input port of the controller receives the first detection signal, it indicates that the second loop Li is conducted and the detection connector Ci is not faulty; if the controller determines that the first input port of the controller does not receive the first detection signal, it indicates that the second loop Li is not conducted, and the faulty detection connector located among the N detection connectors is the detection connector Ci.

[0052] For example, for the first second loop, when the controller determines that there is a faulty detection connector among the N detection connectors, the controller inputs a first detection signal to the third input port of the switch module 1 through the first output port of the controller, and inputs a first decoder control signal to the second input port of the decoder through the control port of the controller; after receiving the first decoder control signal, the decoder outputs a switch conduction signal through the second output port Y1 corresponding to the switch module 1 in the decoder to control the switch module 1 to be turned on; when the switch module 1 is turned on, the first detection signal is input to the fifth input port of the detection connector 1 through the third output port of the switch module 1; the controller determines whether the first input port of the controller receives the first detection signal to determine whether the detection connector 1 is faulty. If the controller determines that the first input port of the controller receives the first detection signal, it means that the first second loop is turned on and the detection connector 1 is not faulty; if the controller determines that the first input port of the controller does not receive the first detection signal, it means that the first second loop is not turned on and the faulty detection connector located among the N detection connectors is the detection connector 1.

[0053] based on Figure 2 The connection relationship in the embodiment, the fault judgment process of detecting the respective connectors 2-N is the same as the fault judgment process of detecting the connector 1, and will not be repeated in the embodiment of the present application.

[0054] In one possible implementation, Figure 3 Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown. Figure 3As shown, A represents the first decoder, B represents the second decoder, UA represents the first optocoupler, and UB represents the second optocoupler.

[0055] The decoder includes a first decoder and a second decoder. For each switch module Ki, the switch module Ki includes a first optocoupler and a second optocoupler. For example, switch module 1 includes a first optocoupler UA1 and a second optocoupler UB1, switch module 2 includes a first optocoupler UA2 and a second optocoupler UB2, and so on. The controlled port of the switch module Ki includes a first controlled port and a second controlled port. In the switch module Ki, the anode of the first optocoupler and the anode of the second optocoupler are both electrically connected to the power port of the switch module Ki, and the power port of the switch module Ki is connected to the power supply; the collector of the first optocoupler is the third input port of the switch module Ki, and the collector of the first optocoupler is electrically connected to the first output port of the controller; the emitter of the first optocoupler is the third output port of the switch module Ki, and the emitter of the first optocoupler is electrically connected to the fifth input port of the detection connector Ci; the cathode of the first optocoupler is the first controlled port of the switch module Ki, and the cathode ... The second output port corresponding to the switch module Ki in the first decoder is electrically connected; the collector of the second optocoupler is the fourth input port of the switch module Ki, and the collector of the second optocoupler is electrically connected to the fifth output port of the detection connector Ci; the emitter of the second optocoupler is the fourth output port of the switch module Ki, and the emitter of the second optocoupler is electrically connected to the first input port of the controller; the cathode of the second optocoupler is the second controlled port of the switch module Ki, and the cathode of the second optocoupler is electrically connected to the second output port corresponding to the switch module Ki in the second decoder; the second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller. Among them, the power pins of the first decoder and the second decoder are connected to the power supply VCC, and the ground pins are connected to the ground GND.

[0056] like Figure 3 As shown, taking N=4 as an example, the process of the controller judging whether there is a faulty detection connector among the N detection connectors and the process of the controller judging the fault of each of the detection connectors 1-N are sequentially described.

[0057] The truth table of the decoder is used to illustrate the principle that the controller controls the decoder so that the decoder is turned on or off. The truth table is shown in Table 1:

[0058] Table 1

[0059]

[0060] In Table 1, "1" indicates a high-level signal and "0" indicates a low-level signal. If any second output port of Y1-Y4 is 1, the corresponding optocoupler is turned on. If any second output port of Y1-Y4 is 0, the corresponding optocoupler is turned off. Figure 4An exemplary connection diagram of the controller and the decoder provided in the embodiment of the present application is shown in FIG. Figure 3 and Figure 4 As shown, the second input ports of the first decoder and the second decoder include two, namely the second sub-input port X1 and the second sub-input port X2, the control ports of the controller include the first control port M31-the fifth control port M35, the first control port M31 of the controller is electrically connected to the second sub-input port X1 of the first decoder, the second control port M32 of the controller is electrically connected to the second sub-input port X2 of the first decoder, the third control port M33 of the controller is electrically connected to the second sub-input port X1 of the second decoder, the fourth control port M34 of the controller is electrically connected to the second sub-input port X2 of the second decoder, and the fifth control port M35 of the controller is electrically connected to the enable ports EN of the first decoder and the second decoder.

[0061] When the fifth control port of the controller outputs a high level signal, the first decoder and the second decoder work; when the fifth control port of the controller outputs a low level signal, the first decoder and the second decoder do not work.

[0062] When N=4, the specific connection of the first loop is: the first output port of the controller - the collector of the first optocoupler UA1 - the emitter of the first optocoupler UA1 - the fifth input port of the detection connector 1 - the fifth output port of the detection connector 1 - the fifth input port of the detection connector 2 - the fifth output port of the detection connector 2 - the fifth output port of the detection connector 4 - the collector of the first optocoupler UB4 - the emitter of the first optocoupler UB4 - the first input port of the controller.

[0063] based on Figure 3 and Figure 4 The connection relationship in the first second loop is as follows: the first output port of the controller - the collector of the first optical coupler UA1 - the emitter of the first optical coupler UA1 - the fifth input port of the detection connector 1 - the fifth output port of the detection connector 1 - the collector of the second optical coupler UB1 - the emitter of the second optical coupler UB1 - the first input port of the controller. The specific connections of the second second loop to the fourth second loop are the same as the specific connections of the first second loop, and will not be repeated in the embodiments of the present application.

[0064] like Figure 3 , Figure 4 As shown in Table 1, the process of the controller determining whether there is a faulty detection connector among the N detection connectors includes:

[0065] When the controller determines that the fault detection conditions are met, the controller outputs an enable signal, i.e., "1", through the fifth control port M35 of the controller, inputs the second detection signal to the collector of the first optocoupler UA1 through the first output port of the controller, inputs the first second decoder control signal, i.e., "0", to the second input port X1 of the first decoder through the first control port M31 of the controller, inputs the second second decoder control signal, i.e., "0", to the second input port X2 of the first decoder through the second control port M32 of the controller, the second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the first optocoupler UA1 to be turned on and the first optocouplers UA2-UA4 to be turned off. Similarly, the third second decoder control signal, i.e., "1", is input to the second input port X1 of the second decoder through the third control port M33 of the controller, and the fourth second decoder control signal, i.e., "1", is input to the second input port X2 of the second decoder through the fourth control port M34 of the controller. The second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the second optocoupler UB4 to be turned on and the first optocouplers UB1-UB3 to be turned off.

[0066] When the first optocoupler UA1 and the second optocoupler UB4 are both turned on and the first optocouplers UA2-UA4 and the second optocouplers UB1-UB3 are all turned off, the controller determines whether the first input port of the controller receives the second detection signal to determine whether there is a faulty detection connector among the N detection connectors.

[0067] like Figure 3 , Figure 4 As shown in Table 1, the controller determines the fault judgment process of each of the detection connectors 1-N as follows:

[0068] When the controller determines that there is a faulty detection connector among the N detection connectors, the controller inputs a first detection signal to the collector of the first optocoupler UA1 through the first output port of the controller, inputs the first first decoder control signal, i.e., "0", to the second input port X1 of the first decoder through the first control port M31 of the controller, inputs the second first decoder control signal, i.e., "0", to the second input port X2 of the first decoder through the second control port M32 of the controller, the second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the first optocoupler UA1 to be turned on and the first optocouplers UA2-UA4 to be turned off. Similarly, the third first decoder control signal, i.e., "0", is input to the second input port X1 of the second decoder through the third control port M33 of the controller, and the fourth first decoder control signal, i.e., "0", is input to the second input port X2 of the second decoder through the fourth control port M34 of the controller. The second output port Y1 of the second decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the second decoder output switch-off signals, i.e., "1", thereby controlling the second optical coupler UB1 to be turned on and the first optical couplers UB2-UB4 to be turned off. The controller determines whether the first input port of the controller receives the first detection signal to determine whether the detection connector 1 is faulty.

[0069] based on Figure 3 and Figure 4 The connection relationship in the embodiment of the present application is not repeated herein, and the process of determining whether the detection connectors 2-4 are faulty is the same as the process of determining whether the detection connector 1 is faulty.

[0070] In one possible implementation, for each switch module Ki, the anode of the first optocoupler and the anode of the second optocoupler in the switch module Ki are electrically connected to the power port of the switch module through a resistor. By connecting a resistor between the anode of the first optocoupler and the anode of the second optocoupler and the power supply, the current in the circuit can be limited and all optocouplers in the protection circuit can be protected.

[0071] In a possible implementation, the resistor includes a first resistor R1 and a second resistor R2. For each switch module Ki, the anode of the first optocoupler in the switch module Ki is electrically connected to the power port of the switch module through the first resistor R1, and the anode of the second optocoupler is electrically connected to the power port of the switch module through the second resistor R2. By connecting the first resistor R1 between the first optocoupler and the power supply and connecting the second resistor R2 between the second optocoupler and the power supply, independent current and voltage distribution can be performed for the first optocoupler and the second optocoupler, which is conducive to providing circuit stability.

[0072] In one possible implementation, Figure 5Another exemplary system block diagram of a fault detection system provided by an embodiment of the present application is shown. Figure 5 As shown, DA represents the first relay, DB represents the second relay, A represents the first decoder, B represents the second decoder, M1 represents the first output port of the controller, M2 represents the first input port of the controller, M3 represents the control port of the controller, the N second output ports of the decoder correspond to the second output ports Y1-YN respectively, Q1 represents the first coil pin of the relay, Q2 represents the second coil pin of the relay, Q3 represents the first contact pin of the relay, Q4 represents the second contact pin of the relay, J1 represents the fifth input port of the detection connector, and J2 represents the fifth output port of the detection connector.

[0073] The decoder includes a first decoder and a second decoder. For each switch module Ki, the switch module Ki includes a first relay and a second relay. For example, the switch module 1 includes a first relay DA1 and a second relay DB1, the switch module 2 includes a first relay DA2 and a second relay DB2, and so on. The controlled port of the switch module Ki includes a first controlled port and a second controlled port. In the switch module Ki, the first contact pin of the first relay is the third input port of the switch module Ki, and the first contact pin of the first relay is electrically connected to the first output port of the controller; the second contact pin of the first relay is the third output port of the switch module Ki, and the second contact pin of the first relay is electrically connected to the fifth input port of the detection connector Ci; the first contact pin of the second relay is the fourth input port of the switch module, and the first contact pin of the second relay is electrically connected to the fifth output port of the detection connector Ci; the second contact pin of the second relay is the fourth output port of the switch module Ki, and the second contact pin of the second relay is electrically connected to the first input port of the controller; the first coil of the first relay The pin is the first controlled port of the switch module Ki, and the first coil pin of the first relay is electrically connected to the second output port corresponding to the switch module Ki in the first decoder; the first coil pin of the second relay is the second controlled port of the switch module Ki, and the first coil pin of the second relay is electrically connected to the second output port corresponding to the switch module Ki in the second decoder; the second coil pin of the first relay and the second coil pin of the second relay are both electrically connected to the power port of the switch module Ki, and the power port of the switch module Ki is connected to the power supply; the second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller, the power pins of the first decoder and the second decoder are connected to the power supply VCC, and the ground pin is connected to the ground GND.

[0074] For any two adjacent detection connectors included in the N detection connectors, the fifth output port of the previous detection connector is connected to the fifth input port of the next detection connector. For example, the fifth output port of the first detection connector is connected to the fifth input port of the second detection connector, the fifth output port of the second detection connector is connected to the fifth input port of the third detection connector, and so on.

[0075] For example, with respect to the connection relationship between the switch module 1 and the detection connector 1 and the controller and the two decoders, the first output port of the controller is electrically connected to the first contact pin of the first relay DA1, the second contact pin of the first relay DA1 is electrically connected to the fifth input port of the detection connector 1, the fifth output port of the detection connector 1 is electrically connected to the first contact pin of the second relay DB1, the second contact pin of the second relay DB1 is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input ports of the first decoder and the second decoder respectively, the second output port Y1 of the first decoder corresponding to the first relay DA1 is electrically connected to the first coil pin of the first relay DA1, the second output port Y1 of the second decoder corresponding to the second relay DB1 is electrically connected to the first coil pin of the second relay DB1, and the second coil pins of the first relay DA1 and the second relay DB1 are connected to the power supply.

[0076] The connection relationship between the switch module 2 and the detection connector 2, ..., the switch module N and the detection connector and the controller and the two decoders respectively is the same as the connection relationship between the switch module 1 and the detection connector 1 and the controller and the two decoders, and will not be repeated in the embodiments of the present application.

[0077] The second input ports of the first decoder and the second decoder include two, namely the second sub-input port X1 and the second sub-input port X2. The control port M3 of the controller includes the first control port M31-the fifth control port M35. The first control port M31 of the controller is electrically connected to the second sub-input port X1 of the first decoder, the second control port M32 of the controller is electrically connected to the second sub-input port X2 of the first decoder, the third control port M33 of the controller is electrically connected to the second sub-input port X1 of the second decoder, the fourth control port M34 of the controller is electrically connected to the second sub-input port X2 of the second decoder, and the fifth control port M35 of the controller is electrically connected to the enable ports EN of the first decoder and the second decoder.

[0078] When the fifth control port of the controller outputs a high level signal, the first decoder and the second decoder work; when the fifth control port of the controller outputs a low level signal, the first decoder and the second decoder do not work.

[0079] based on Figure 5 , when N=4, the specific connection of the first loop is: the first output port of the controller-the first contact pin of the first relay DA1-the second contact pin of the first relay DA1-the fifth input port of the detection connector 1--the fifth output port of the detection connector 1--the fifth input port of the detection connector 2--the fifth output port of the detection connector 2--the fifth output port of the detection connector 4--the first contact pin of the second relay DB4--the second contact pin of the second relay DB4--the first input port of the controller.

[0080] The specific connection of the first second loop is: the first output port of the controller - the first contact pin of the first relay DA1 - the second contact pin of the first relay DA1 - the fifth input port of the detection connector 1 - the fifth output port of the detection connector 1 - the first contact pin of the second relay DB1 - the second contact pin of the second relay DB1 - the first input port of the controller. The specific connection of the second second loop to the fourth second loop is the same as the specific connection of the first second loop, and the embodiments of the present application will not be repeated.

[0081] like Figure 5 As shown in Table 1, the process of the controller determining whether there is a faulty detection connector among the N detection connectors includes:

[0082] When the controller determines that the fault detection conditions are met, the controller outputs an enable signal, i.e., "1", through the fifth control port M35 of the controller, inputs the second detection signal to the first contact pin of the first relay DA1 through the first output port of the controller, inputs the first second decoder control signal, i.e., "0", to the second input port X1 of the first decoder through the first control port M31 of the controller, inputs the second second decoder control signal, i.e., "0", to the second input port X2 of the first decoder through the second control port M32 of the controller, the second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the first relay DA1 to be turned on and the first relays DA2-DA4 to be turned off. Similarly, the third second decoder control signal, i.e., "1", is input to the second input port X1 of the second decoder through the third control port M33 of the controller, and the fourth second decoder control signal, i.e., "1", is input to the second input port X2 of the second decoder through the fourth control port M34 of the controller. The second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the second relay DB4 to be turned on and the second relays DB1-DB3 to be turned off.

[0083] When the first relay DA1 and the second relay DB4 are both turned on and the first relays DA2-DA4 and the second relays DB1-DB3 are all turned off, the controller determines whether the first input port of the controller receives the second detection signal to determine whether there is a faulty detection connector among the N detection connectors.

[0084] like Figure 5 As shown in Table 1, the controller determines the fault judgment process of each of the detection connectors 1-N as follows:

[0085] When the controller determines that there is a faulty detection connector among the N detection connectors, the controller inputs a first detection signal to the first contact pin of the first relay DA1 through the first output port of the controller, inputs the first first decoder control signal, i.e., "0", to the second input port X1 of the first decoder through the first control port M31 of the controller, inputs the second first decoder control signal, i.e., "0", to the second input port X2 of the first decoder through the second control port M32 of the controller, the second output port Y1 of the first decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the first decoder output switch-off signals, i.e., "1", thereby controlling the first relay DA1 to be turned on and the first relays DA2-DA4 to be turned off. Similarly, the third first decoder control signal, i.e., "0", is input to the second input port X1 of the second decoder through the third control port M33 of the controller, and the fourth first decoder control signal, i.e., "0", is input to the second input port X2 of the second decoder through the fourth control port M34 of the controller. The second output port Y1 of the second decoder outputs a switch-on signal, i.e., "0", and the second output ports Y2-Y4 of the second decoder output switch-off signals, i.e., "1", thereby controlling the second relay DB1 to be turned on and the second relays DB2-DB4 to be turned off. The controller determines whether the first input port of the controller receives the first detection signal to determine whether the detection connector 1 is faulty.

[0086] Based on the connection relationship in 5, the process of determining whether each of the detection connectors 2-4 is faulty is the same as the process of determining whether the detection connector 1 is faulty, and the embodiments of the present application will not be repeated.

[0087] In one possible implementation, based on Figure 1 In the connection relationship, the fault detection system 100 also includes a redundant decoder and a redundant switch module ( Figure 1 (not shown in the figure), the redundant decoder is electrically connected to the controller through a redundant switch module, and the redundant decoder is electrically connected to N switch modules.

[0088] Among them, the redundant decoder is a backup of the decoder 120. When the decoder 120 is not faulty, the redundant switch module disconnects the connection between the controller 110 and the redundant decoder, and the redundant decoder will not be connected to the circuit; when the decoder 120 fails, the redundant switch module connects the controller 110 to the redundant decoder, and the redundant decoder is connected to the circuit. The controller 110 controls the N switch modules by controlling the redundant decoder to perform fault detection, which is beneficial to improving the reliability of the system.

[0089] In one possible implementation, based on Figure 1 In the case where the fault detection system 100 includes a redundant decoder and a redundant switch module, the fault detection system 100 also includes a redundant controller ( Figure 1 The redundant controllers are respectively connected to the controller and N switch modules, and the redundant controllers are electrically connected to the redundant decoders through the redundant switch modules.

[0090] Among them, the redundant controller is a backup of the controller 110. When the controller 110 is not faulty, the redundant controller does not participate in the control. When the controller 110 fails, the redundant controller takes over the work of the controller 110 and participates in the control. The redundant controller controls the N switch modules through the control decoder or the redundant decoder to perform fault detection, which is beneficial to improving the reliability of the system.

[0091] The following is an exemplary embodiment of a vehicle provided by the present application.

[0092] Figure 6 An exemplary schematic diagram of a vehicle provided by the present application is shown, such as Figure 6 As shown, a vehicle 300 provided in the present application includes a high-voltage interlocking circuit 200 and the above-mentioned fault detection system 100, the high-voltage interlocking circuit is provided with N detection connectors, and the fault detection system 100 is electrically connected to the N detection connectors, N≥2.

[0093] Since the fault detection system of the above-mentioned vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, that is, the vehicle can not only detect whether the high-voltage interlocking circuit is faulty, but also can accurately locate the fault source when a fault occurs in the high-voltage interlocking circuit.

[0094] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A fault detection system, characterized in that: Applicable to a high-voltage interlocking circuit having N detection connectors, the N detection connectors are sequentially connected in series, N≥2, the fault detection system comprises: N switch modules, a decoder and a controller, the N switch modules are electrically connected to the N detection connectors in a one-to-one correspondence, the decoder is electrically connected to the controller, and the decoder and the controller are both electrically connected to the N switch modules; The controller is used for inputting a first detection signal to each switch module and a first decoder control signal to the decoder when it is determined that there is a faulty detection connector among the N detection connectors; The decoder is used to control the switch module to conduct according to the first decoder control signal, so that the switch module inputs the first detection signal to the target detection connector; wherein the target detection connector is the detection connector connected to the switch module; The controller is used to determine whether the target detection connector returns the first detection signal to the controller through the switch module, so as to determine whether the target detection connector is faulty.

2. The fault detection system according to claim 1, characterized in that: The controller is used to input a second decoder control signal to the decoder and a second detection signal to the first switch module when a fault detection condition is met; wherein the fault detection condition includes: the controller receives a fault detection instruction and / or instructs the controller to perform a fault detection on the high-voltage interlocking circuit. The interval duration has arrived; The decoder is used to control the first switch module and the Nth switch module to be turned on according to the second decoder control signal, and control the second switch module to the N-1th switch module to be turned off, so that the first switch module inputs the second detection signal to the first detection connector; The controller is used to determine whether the Nth detection connector returns the second detection signal to the controller through the Nth switch module, so as to determine whether there is a faulty detection connector among the N detection connectors.

3. The fault detection system according to claim 2, characterized in that: The controller includes a first output port, a first input port and a control port, the decoder includes a second input port and N second output ports, and each second output port of the decoder corresponds to a switch module; For each switch module and each detection connector, the switch module includes a third input port, a third output port, a fourth input port, a fourth output port, a controlled port and a power port, and the detection connector includes a fifth input port and a fifth output port; For any two adjacent detection connectors included in the N detection connectors, the fifth output port of the first detection connector is connected to the fifth input port of the second detection connector; The first output port of the controller is electrically connected to the third input port of the switch module, the third output port of the switch module is electrically connected to the fifth input port of the detection connector, the fifth output port of the detection connector is electrically connected to the fourth input port of the switch module, the fourth output port of the switch module is electrically connected to the first input port of the controller, the control port of the controller is electrically connected to the second input port of the decoder, the controlled port of the switch module is electrically connected to the second output port corresponding to the switch module, and the power port of the switch module is connected to a power supply.

4. The fault detection system according to claim 3, characterized in that: The decoder includes a first decoder and a second decoder, the switch module includes a first optical coupler and a second optical coupler, and the controlled port of the switch module includes a first controlled port and a second controlled port; The anode of the first optical coupler and the anode of the second optical coupler are both electrically connected to the power port of the switch module; The collector of the first optical coupler is the third input port of the switch module, and the collector of the first optical coupler is electrically connected to the first output port of the controller; The emitter of the first optical coupler is the third output port of the switch module, and the emitter of the first optical coupler is electrically connected to the fifth input port of the detection connector; The cathode of the first optical coupler is the first controlled port of the switch module, and the cathode of the first optical coupler is electrically connected to the second output port of the first decoder corresponding to the switch module; The collector of the second optical coupler is the fourth input port of the switch module, and the collector of the second optical coupler is electrically connected to the fifth output port of the detection connector; The emitter of the second optical coupler is the fourth output port of the switch module, and the emitter of the second optical coupler is electrically connected to the first input port of the controller; The cathode of the second optical coupler is the second controlled port of the switch module, and the cathode of the second optical coupler is electrically connected to the second output port of the second decoder corresponding to the switch module; The second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller.

5. The fault detection system according to claim 4, characterized in that: The anode of the first optical coupler and the anode of the second optical coupler are both electrically connected to the power port of the switch module through resistors.

6. The fault detection system according to claim 5, characterized in that: The resistor includes a first resistor and a second resistor, the anode of the first optical coupler is electrically connected to the power port of the switch module through the first resistor, and the anode of the second optical coupler is electrically connected to the power port of the switch module through the second resistor.

7. The fault detection system according to claim 3, characterized in that: The decoder includes a first decoder and a second decoder, the switch module includes a first relay and a second relay, and the controlled port of the switch module includes a first controlled port and a second controlled port; The first contact pin of the first relay is the third input port of the switch module, and the first contact pin of the first relay is electrically connected to the first output port of the controller; The second contact pin of the first relay is the third output port of the switch module, and the second contact pin of the first relay is electrically connected to the fifth input port of the detection connector; The first contact pin of the second relay is the fourth input port of the switch module, and the first contact pin of the second relay is electrically connected to the fifth output port of the detection connector; The second contact pin of the second relay is the fourth output port of the switch module, and the second contact pin of the second relay is electrically connected to the first input port of the controller; The first coil pin of the first relay is the first controlled port of the switch module, and the first coil pin of the first relay is electrically connected to the second output port in the first decoder; The first coil pin of the second relay is the second controlled port of the switch module, and the first coil pin of the second relay is electrically connected to the second output port of the second decoder; The second coil pin of the first relay and the second coil pin of the second relay are both electrically connected to the power port of the switch module; The second input ports of the first decoder and the second decoder are both electrically connected to the control port of the controller.

8. The fault detection system according to claim 2, characterized in that: The fault detection system also includes a redundant decoder and a redundant switch module; The redundant decoder is electrically connected to the controller through the redundant switch module, and the redundant decoder is electrically connected to the N switch modules.

9. The fault detection system according to claim 8, characterized in that: The fault detection system also includes a redundant controller; The redundant controller is connected to the controller and the N switch modules respectively, and the redundant controller is electrically connected to the redundant decoder through the redundant switch module.

10. A vehicle, characterized in that: The vehicle comprises: A high-voltage interlocking circuit, wherein the high-voltage interlocking circuit is provided with a plurality of detection connectors; The fault detection system according to any one of claims 1 to 9, wherein the fault detection system is electrically connected to the plurality of detection connectors.

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