Fault detection system and vehicle

Abstract

The present application provides a fault detection system and vehicle, relating to the field of vehicle technology. The system is applied to a high-voltage interlock circuit having N detection connectors, and includes: a controller, a decoder, and N switch modules. The N detection connectors are connected in series, and the N switch modules are electrically connected to the N detection connectors in a one-to-one correspondence, where N ≥ 2. When the controller determines that a faulty detection connector is present among the N detection connectors, it inputs a detection signal to each switch module and a control signal to the decoder. The decoder controls each switch module to conduct according to the control signal, so that each switch module inputs a detection signal to the detection connector connected to each switch module. The controller determines whether it has received a detection signal returned by the detection connector connected to each switch module to determine whether the detection connector connected to each switch module is faulty. The present application can accurately locate the specific location of the fault when a fault occurs in the high-voltage interlock circuit.

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. The high-voltage electrical system is 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 (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 interlock circuit through wires. The high-voltage interlock 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] Related art high-voltage interlock systems typically include a high-voltage interlock detection circuit and a control system. Once the high-voltage interlock detection circuit detects a disconnection in the high-voltage interlock circuit, it immediately sends a signal to the control system, causing it to cut off the high-voltage output of all loads to ensure safety. However, the high-voltage interlock detection circuit in related art cannot accurately detect the specific location of the disconnection in the high-voltage interlock circuit, resulting in low efficiency in troubleshooting the high-voltage interlock 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 for a high-voltage interlock circuit having N detection connectors, the N detection connectors being connected in series, where 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 configured to, upon determining that a faulty detection connector is present among the N detection connectors, input a first detection signal to each switch module and a first decoder control signal to the decoder; the decoder is configured 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 a target detection connector; wherein the target detection connector is the detection connector connected to the switch module; and the controller is configured to determine whether the target detection connector returns the first detection signal to the controller via the switch module, thereby determining 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 this 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 there is a fault in the high-voltage interlocking circuit, which is conducive to timely reporting of the fault location.

[0007] In one possible implementation, the controller is configured 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 configured to control the first switch module and the Nth switch module to be turned on, and to control the second to N-1th switch modules to be turned off, based on the second decoder control signal, so that the first switch module inputs the second detection signal to the first detection connector; the controller is configured to determine whether the Nth detection connector returns the second detection signal to the controller via 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 receiving a fault detection instruction and / or the expiration of an interval instructing the controller to perform fault detection on the high-voltage interlock circuit.

[0008] In one 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 preceding detection connector corresponds to the fifth output port of the succeeding 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 corresponding second output port of 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, 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, 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 through resistors.

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

[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 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.

[0015] In a second aspect, a vehicle is provided, comprising: a high-voltage interlock circuit and the above-mentioned fault detection system, wherein the high-voltage interlock 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 a fault occurs in the high-voltage interlocking circuit. 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 of 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 following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this 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 this application, "multiple" means two or more than two.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, 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. The high-voltage electrical system is used to power high-power electrical equipment (such as motors) in the vehicle. In order to perform real-time detection of the working status of the high-voltage electrical system, a high-voltage interlocking system is usually installed in the vehicle. The high-voltage interlocking 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.

[0026] Related art high-voltage interlock systems typically include a high-voltage interlock detection circuit and a control system. Once the high-voltage interlock detection circuit detects a disconnection in the high-voltage interlock circuit, it immediately sends a signal to the control system, causing it to cut off the high-voltage output of all loads to ensure safety. However, the high-voltage interlock detection circuit in related art cannot accurately detect the specific location of the disconnection in the high-voltage interlock circuit, resulting in low efficiency in troubleshooting the high-voltage interlock 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 this application specification.

[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. The high-voltage interlock circuit 200 includes a plug assembly 140, which includes N detection connectors, i.e., detection connector 1 - detection connector N, where N ≥ 2. The detection connector is specifically a low-voltage detection connector, which is installed on the high-voltage connector for connecting to the high-voltage component.

[0030] Fault detection system 100 includes a controller 110, a decoder 120, and a switch assembly 130. Switch assembly 130 includes N switch modules, namely, switch module 1 through switch module N. Decoder 120 is electrically connected to controller 110, and both decoder 120 and controller 110 are electrically connected to the N switch modules. The N detection connectors are connected in series, with each switch module corresponding to the other. For example, switch module 1 is electrically connected to detection connector 1, switch module 2 is electrically connected to detection connector 2, and so on. Finally, switch module N is electrically connected to detection connector N.

[0031] based on Figure 1 The hardware in fault detection system 100 can form a first loop and N second loops, based on the circuit connection relationship in FIG. 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 of the N second loops is represented as a second loop Li. The specific connection of the second loop Li is: controller 110 - switch module Ki - detection connector Ci - controller 110, where switch module Ki represents each of the N switch modules, and detection connector Ci represents the detection connector corresponding to switch module Ki among 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 a faulty detection connector exists among N detection connectors, the controller can perform relevant control to locate which detection connector among the N detection connectors has the fault. The process of the controller locating the faulty detection connector is as follows:

[0033] When the controller determines that a faulty detection connector exists among the N detection connectors, it inputs a first detection signal to each 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, causing the switch module Ki to input the first detection signal to the target detection connector. The controller then determines whether the target detection connector returns the first detection signal to the controller via the switch module Ki to determine whether the target detection connector is faulty. The first detection signal may be, for example, a PWM signal. When the controller detects that the first circuit is not conducting, it determines that a faulty detection connector exists among the N detection connectors. The target detection connector is the detection connector connected to the switch module, i.e., the detection connector Ci.

[0034] Specifically, after the switch module Ki is turned on, if the detection connector Ci is not faulty, the first detection signal will be returned to the controller through the switch module Ki, indicating that the second circuit Li is conductive. 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 will determine that the detection connector Ci has not failed. If the detection connector Ci fails, the first detection signal will not be returned to the controller through the switch module Ki, indicating that the second circuit Li is not conductive. 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 will determine that the detection connector Ci has failed, that is, the faulty detection connector among the N detection connectors is located as the detection connector Ci. A preset time period can be set. If the controller receives the first detection signal within the preset time period, it indicates that the detection connector Ci has not failed. If the controller does not receive the first detection signal within the preset time period, it indicates that the detection connector Ci has failed.

[0035] For example, to determine whether detection connector 1 is faulty, if the controller determines that a faulty detection connector is present among N detection connectors, the controller inputs a first detection signal to switch module 1 and a first decoder control signal to the decoder. After receiving the first decoder control signal, the decoder controls switch module 1 to conduct according to the first decoder control signal, so that switch module 1 inputs the first detection signal to detection connector 1. The controller then determines whether detection connector 1 returns the first detection signal to the controller via switch module 1. If the controller determines that detection connector 1 returns the first detection signal to the controller via switch module 1, it indicates that the first second circuit is conductive and detection connector 1 is not faulty. If the controller determines that detection connector 1 does not return the first detection signal to the controller via switch module 1, it indicates that the first second circuit is conductive and detection connector 1 is faulty. The faulty detection connector among the N detection connectors is thus located.

[0036] The process of determining whether each of the detection connectors 2 to N is faulty is similar to the process of determining whether the detection connector 1 is faulty, and will not be described in detail in this 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 the accurate positioning of the specific location of the fault when there is a fault in the high-voltage interlocking circuit, which is conducive to timely reporting of the fault location.

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

[0039] If the controller determines that a fault detection condition is met, it inputs a second decoder control signal to the decoder and a second detection signal to the first switch module, where the second detection signal is, for example, a PWM signal. After receiving the second decoder control signal, the decoder controls the first and Nth switch modules to be turned on, and controls the second through N-1th switch modules to be turned off, so that the first switch module inputs the second detection signal to the first detection connector. The controller then determines whether the Nth detection connector returns the second detection signal to the controller via the Nth switch module, thereby determining whether a faulty detection connector exists among the N detection connectors. The fault detection condition includes the controller receiving a fault detection instruction and / or the expiration of an interval instructing the controller to perform fault detection on the high-voltage interlock circuit.

[0040] Specifically, if none of the N detection connectors are faulty, when the first switch module and the Nth switch module are conductive, the first circuit is conductive, and the second detection signal will sequentially pass through the first switch module, the second detection connector, ..., the Nth detection connector, and the Nth switch module and return to the controller. That is, the controller will determine that the Nth detection connector has returned the second detection signal to the controller via the Nth switch module, indicating that the controller has received the returned second detection signal, and thus determine that none of the N detection connectors is faulty, that is, none of the N detection connectors is faulty. If one of the N detection connectors is faulty, when the first switch module and the Nth switch module are conductive, the first circuit will not be conductive, and the controller will determine that the Nth detection connector has not returned the second detection signal to the controller via the Nth switch module, indicating that the controller has not received the returned second detection signal, and thus determine that none of the N detection connectors is faulty.

[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 source of the fault 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. 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. The detection connector Ci includes a fifth input port and a fifth output port.

[0043] Figure 2 Wherein, 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 among the N detection connectors, the fifth output port of the preceding detection connector is connected to the fifth input port of the succeeding 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 corresponding second output port of the switch module Ki, and the power port of the switch module Ki is connected to a power source.

[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. 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 / output 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 / output port of the switch module 1 - the fourth input / output port of the switch module 1 - the first input port of the controller. The specific connections of the second to Nth second loops are similar to those of the first second loop and will not be repeated in this embodiment.

[0048] based on Figure 2 The process of the controller determining 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 YN corresponding to the second switch module in the decoder. The second output ports corresponding to the switch modules from the switch module to the N-1th switch module output switch-off signals, i.e., Y2-Y(N-1) all output switch-off signals, to control the disconnection of the switch modules from the second to the N-1th switch modules, i.e., switch modules 2 to switch modules N-1 are all disconnected, so that the second detection signal is input to the fifth input port of the first detection connector via the third output port of the first switch module, i.e., the second detection signal is input to the fifth input port of detection connector 1 via 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 conductive, then it is determined that none of the N detection connectors are faulty. 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 conductive, then it is determined that there is a faulty detection connector among the N detection connectors.

[0050] based on Figure 2 Based on the connection relationship in , the process of the controller locating the faulty detection connector among N detection connectors is as follows:

[0051] For each second loop Li, if the controller determines that a faulty detection connector exists among the N detection connectors, it inputs a first detection signal to the third input port of the switch module Ki via its first output port, and inputs a first decoder control signal to the second input port of the decoder via its control port. After receiving the first decoder control signal, the decoder outputs a switch-on signal via its second output port corresponding to the switch module Ki, thereby controlling the switch module Ki to conduct. When the switch module Ki is conducting, the controller inputs the first detection signal to the fifth input port of the detection connector Ci via its third output port. 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 conducting 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 conducting and the faulty detection connector among the N detection connectors is located in the detection connector Ci.

[0052] For example, for the first second circuit, if the controller determines that a faulty detection connector exists among the N detection connectors, it inputs a first detection signal to the third input port of switch module 1 through the controller's first output port, and inputs a first decoder control signal to the second input port of the decoder through the controller's control port. After receiving the first decoder control signal, the decoder outputs a switch-on signal through the decoder's second output port Y1 corresponding to switch module 1, thereby controlling switch module 1 to turn on. When switch module 1 is on, the controller inputs the first detection signal to the fifth input port of detection connector 1 through the third output port of switch module 1. The controller determines whether the controller's first input port receives the first detection signal to determine whether detection connector 1 is faulty. If the controller determines that the controller's first input port receives the first detection signal, it indicates that the first second circuit is on and detection connector 1 is not faulty. If the controller determines that the controller's first input port does not receive the first detection signal, it indicates that the first second circuit is not on and the faulty detection connector among the N detection connectors is 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 detail 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 in FIG. 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 first decoder is electrically connected to the second output port corresponding to the switch module Ki; 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. 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 detection connector 1-N are described in sequence.

[0057] The truth table of the decoder explains the principle that the controller controls the decoder to turn the decoder 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 an 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 to 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 specific connections for the first second loop are: first output port of the controller - collector of the first optocoupler UA1 - emitter of the first optocoupler UA1 - fifth input port of the detection connector 1 - fifth output port of the detection connector 1 - collector of the second optocoupler UB1 - emitter of the second optocoupler UB1 - first input port of the controller. The specific connections for the second through fourth second loops are similar to those for the first second loop and are not further described in this embodiment.

[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, it 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, outputs the switch-on signal, i.e., "0", and outputs the switch-off signal, i.e., "1", from the second output ports Y2-Y4 of the first decoder, 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, and 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 via the third control port M33 of the controller. The fourth first decoder control signal, i.e., "0," is input to the second input port X2 of the second decoder via 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 optocoupler UB1 to turn on and the first optocouplers UB2-UB4 to turn off. The controller determines whether the first input port of the controller receives the first detection signal to determine whether 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 one possible implementation, the resistors include 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 via the first resistor R1, and the anode of the second optocoupler is electrically connected to the power port of the switch module via the second resistor R2. By connecting the first resistor R1 between the first optocoupler and the power supply and the second resistor R2 between the second optocoupler and the power supply, independent current and voltage distribution can be achieved for the first and second optocouplers, which helps to improve circuit stability.

[0072] In one possible implementation, Figure 5FIG. 1 shows another exemplary system block diagram of a fault detection system provided by an embodiment of the present application. 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, switch module 1 includes a first relay DA1 and a second relay DB1, 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 of the first decoder corresponding to the switch module Ki; 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 of the second decoder corresponding to the switch module Ki; 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 a 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 pins are 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, regarding the connection relationship between the switch module 1, the detection connector 1, 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 relationships 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 are similar to the connection relationships 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 port 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 connections of the first loop are: first output port of the controller - first contact pin of the first relay DA1 - second contact pin of the first relay DA1 - fifth input port of detection connector 1 - fifth output port of detection connector 1 - fifth input port of detection connector 2 - fifth output port of detection connector 2 - fifth output port of detection connector 4 - first contact pin of the second relay DB4 - second contact pin of the second relay DB4 - first input port of the controller.

[0080] The specific connections for the first second loop are: first output port of the controller - first contact pin of the first relay DA1 - second contact pin of the first relay DA1 - fifth input port of the detection connector 1 - fifth output port of the detection connector 1 - first contact pin of the second relay DB1 - second contact pin of the second relay DB1 - first input port of the controller. The specific connections for the second through fourth second loops are similar to those for the first second loop and will not be further described in this embodiment.

[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, it outputs an enable signal, i.e., "1", through the fifth control port M35 of the controller, inputs a 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 a faulty detection connector exists 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 a 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, and inputs a 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 controller's third control port M33 inputs the third first decoder control signal, i.e., "0," to the second input port X1 of the second decoder. The controller's fourth control port M34 inputs the fourth first decoder control signal, i.e., "0," to the second input port X2 of the second decoder. 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 on and the second relays DB2-DB4 to be off. The controller determines whether its first input port receives the first detection signal to determine whether 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 will not be repeated in this embodiment of the application.

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

[0088] The redundant decoder is a backup for decoder 120. When decoder 120 is not faulty, the redundant switch module disconnects the controller 110 from the redundant decoder, and the redundant decoder is not connected to the circuit. When decoder 120 fails, the redundant switch module connects the controller 110 to the redundant decoder, and the redundant decoder is connected to the circuit. Controller 110 controls the N switch modules by controlling the redundant decoder to perform fault detection, which helps improve system reliability.

[0089] In one possible implementation, based on Figure 1 In the connection relationship, when 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 (not shown), the redundant controller is connected to the controller and N switch modules respectively, and the redundant controller is electrically connected to the redundant decoder through the redundant switch module.

[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 replaces the controller 110 to participate in the control. The redundant controller controls 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 this application.

[0092] Figure 6 An exemplary schematic diagram of a vehicle provided by the present application is shown in FIG. Figure 6 As shown, the present application provides a vehicle 300, including 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 accurately locate the source of the fault when a fault occurs in the high-voltage interlocking circuit.

[0094] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A fault detection system, characterized in that: Applicable to a high-voltage interlock circuit having N detection connectors, the N detection connectors being connected in series in sequence, where N is greater than or equal to 2. The fault detection system comprises: N switch modules, a decoder, and a controller, the N switch modules being electrically connected to the N detection connectors in a one-to-one correspondence, the decoder being electrically connected to the controller, and both the decoder and the controller being electrically connected to the N switch modules; The controller is configured 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 receiving a fault detection instruction and / or the duration of an interval instructing the controller to perform fault detection on the high-voltage interlock circuit has expired; the decoder is configured 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 configured to determine whether the Nth detection connector returns the second detection signal to the controller via the Nth switch module, so as to determine whether there is a faulty detection connector among the N detection connectors; The controller is configured to input a first detection signal to each switch module and a first decoder control signal to the decoder when it is determined that a faulty detection connector exists among the N detection connectors; The decoder is configured 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 configured to determine whether the target detection connector returns the first detection signal to the controller via the switch module, so as to determine whether the target detection connector is faulty; 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 among the N detection connectors, the fifth output port of the preceding detection connector is connected to the fifth input port of the succeeding 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 corresponding second output port of the switch module, and the power port of the switch module is connected to a power source; 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 collector of the first optocoupler is electrically connected to the first output port of the controller; The cathode 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.

2. The fault detection system according to claim 1, characterized in that: 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 through resistors.

3. The fault detection system according to claim 2, 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. The anode of the second optical coupler is electrically connected to the power port of the switch module through the second resistor.

4. The fault detection system according to claim 1, characterized in that: The first optocoupler and the second optocoupler in the switch module are replaced by a first relay and a second relay respectively; 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 of 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.

5. The fault detection system according to claim 1, 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.

6. The fault detection system according to claim 5, 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.

7. A vehicle, characterized in that: The vehicle comprises: A high-voltage interlock circuit, wherein the high-voltage interlock circuit is provided with a plurality of detection connectors; The fault detection system according to any one of claims 1 to 6, wherein the fault detection system is electrically connected to the plurality of detection connectors.

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