Automobile system circuit supporting switch turn-off and realizing limping mode and automobile

Abstract

According to the automobile system circuit supporting switch turn-off and achieving the limp mode, when an MCU breaks down and enters the limp mode state, and a one-key starting switch is not pressed down, a logic processing circuit can be taken over through a latch circuit, and therefore an MOSFET is controlled through the logic processing circuit to be maintained in the working state before the MCU breaks down; when the one-key starting switch is pressed down, a closing instruction is sent to the logic processing circuit through the latch circuit, so that the function of the load of the vehicle is ensured not to be influenced by the fault of the MCU and the vehicle works normally, the safety of the vehicle is improved, and when the one-key starting switch is pressed down, the closing instruction is sent to the logic processing circuit through the latch circuit. Therefore, the MOSFET is controlled to be closed through the logic processing circuit, that is, the load is closed, the situation that the function of the opened load cannot be closed even after the vehicle is parked is avoided, and convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive control, and in particular to an automobile system circuit and an automobile which support switch off and realize limp home mode. Background Art

[0002] LIMP HOME mode is a vehicle fault protection mechanism. When a vehicle fails, the vehicle will automatically enter LIMP HOME mode to ensure its safety and reliability. In LIMP HOME mode, the vehicle's performance and functions will be limited to a certain extent, but it can still continue to drive so that the vehicle can be safely driven back to the repair station for repair.

[0003] In order to ensure the normal operation of LIMP HOME mode, it is necessary to add the KL15 relay holding function to the vehicle circuit. The KL15 relay is an important part of the vehicle circuit. It is responsible for controlling the vehicle's power switch to ensure the normal operation of the vehicle. In LIMP HOME mode, the KL15 relay needs to remain in the open state to ensure that the vehicle's circuit system can work normally.

[0004] In the prior art, after the vehicle enters LIMP HOME mode, some functions of the load will be directly turned on, resulting in poor vehicle safety. For example, after the vehicle enters LIMP HOME mode, the fuel pump is turned on, and some hybrid vehicles are powered by batteries when entering LIMP HOME mode. At this time, the fuel pump cannot be turned on, and the fuel pump is turned on for a long time, which is dangerous to the vehicle. Moreover, the functions of the turned-on load may not be turned off even after the vehicle stops, which is very inconvenient. Summary of the invention

[0005] The present invention provides an automobile system circuit that supports switch off and realizes limp home mode, so as to improve the safety and convenience of the automobile. The specific technical solution is as follows:

[0006] In a first aspect, the present invention provides an automotive system circuit that supports switch shutdown and implements a limp home mode, comprising:

[0007] A fault output circuit and at least one set of control logic modules, each set of control logic modules includes a metal oxide semiconductor field effect transistor MOSFET, a signal detection circuit, a logic processing circuit and a latch circuit;

[0008] The signal detection circuit and logic processing circuit of each control logic module are connected to the fault output circuit signal, and the fault output circuit is also connected to the micro control unit MCU of the vehicle signal;

[0009] For each group of control logic modules, the first end of the MOSFET of the group is connected to the power signal of the car, the second end of the MOSFET of the group is connected to the logic processing circuit signal of the group, the logic processing circuit of the group is connected to the MCU signal, the third end of the MOSFET of the group is respectively connected to the load of the car and the latch circuit signal of the group, the signal detection circuit of the group is respectively connected to the one-button start switch of the car and the latch circuit signal of the group, and the latch circuit of the group is connected to the logic processing circuit signal of the group;

[0010] The fault output circuit detects that the MCU fails and outputs a fault signal enable signal to the signal detection circuit and logic processing circuit of each group of control logic modules respectively;

[0011] For each group of control logic modules, the signal detection circuit of the group switches from a normal working state to a limp home mode state after receiving the fault signal enable signal, and detects whether the one-button start switch is pressed;

[0012] The logic processing circuit of the group switches from a normal working state to a limp mode state after receiving the fault signal enable signal, and shields the system signal sent by the MCU;

[0013] When the signal detection circuit of the group detects that the one-key start switch is not pressed, a takeover instruction is sent to the latch circuit of the group;

[0014] The latch circuit of the group receives the takeover instruction sent by the signal detection circuit of the group, collects the working state information of the MOSFET of the group before the MCU fails, and sends it to the logic processing circuit of the group as the current working state information;

[0015] The logic processing circuit of the group receives the current working state information sent by the latch circuit of the group, and controls the MOSFET of the group to turn on or off based on the current working state information;

[0016] When the signal detection circuit of the group detects that the one-key start switch is pressed, a closing instruction is sent to the latch circuit of the group;

[0017] The latch circuit of the group receives the closing instruction sent by the signal detection circuit of the group, and sends the closing instruction to the logic processing circuit of the group;

[0018] The logic processing circuit of the group receives the shutdown instruction sent by the latch circuit of the group and turns off the MOSFET of the group.

[0019] Optionally, after the fault output circuit detects that the MCU has returned to normal, it sends a stop detection instruction to each group of signal detection circuits and a recovery control instruction to each group of logic processing circuits;

[0020] For each group of control logic modules, the signal detection circuit of the group stops detecting whether the one-key start switch is pressed after receiving the stop detection instruction;

[0021] After receiving the recovery control instruction, the logic processing circuit of the group receives the system signal sent by the MCU again.

[0022] Optionally, the above-mentioned automobile system circuit supporting switch shutdown and realizing limp home mode further includes a power anti-reverse device;

[0023] For each group of control logic modules, the first end of the MOSFET of the group is connected to the power reverse preventer signal, and the power reverse preventer is connected to the power signal of the car.

[0024] Optionally, the signal detection circuit of each group includes a first resistor, a second resistor, a third resistor, a fourth resistor, a voltage comparator, a voltage source and a first switch tube;

[0025] The one-key start switch is connected in parallel with the first resistor, one end of the first resistor is grounded, and the other end is signal-connected to one end of the second resistor, the other end of the second resistor is signal-connected to one end of the third resistor and the comparison end of the voltage comparator respectively, the other end of the third resistor is signal-connected to the fault output circuit, and the reference source end of the voltage comparator is grounded via the voltage source;

[0026] One end of the fourth resistor is connected to the fault output circuit signal, and the other end is respectively connected to the positive power supply end of the voltage comparator and the latch circuit signal of the group. The negative power supply end of the voltage comparator is grounded, the output end of the voltage comparator is connected to the first signal end signal of the first switch tube, the output end of the first switch tube is connected to the latch circuit signal of the group, and the second signal end of the first switch tube is grounded.

[0027] Optionally, the logic processing circuit of each group is a driver chip that supports a level switching function, a serial peripheral interface SPI control function, and a level control function.

[0028] Optionally, the latch circuit of each group is also connected to the MCU signal;

[0029] When the car is started, the MCU sends an activation instruction to each group of latch circuits to activate each latch circuit.

[0030] Optionally, the latch circuit of each group includes a NOT gate, a first OR gate, a first diode, a second diode and a tri-state single buffer gate;

[0031] The input end of the NOT gate is connected to the MOSFET signal of the group, the output end of the NOT gate is connected to the first input end signal of the first OR gate, the second input end of the first OR gate is connected to the signal of the signal detection circuit of the group, the output end of the first OR gate is connected to the output enable end signal of the three-state single buffer gate, the anode of the first diode is connected to the MCU signal, the cathode of the first diode is respectively connected to the cathode of the second diode and the input end signal of the three-state single buffer gate, the output end of the three-state single buffer gate is connected to the logic processing circuit signal of the group, and the anode of the second diode is connected to the logic processing circuit signal of the group.

[0032] Optionally, the fault output circuit includes a second OR gate and a second switch tube;

[0033] The first input end of the second OR gate is connected to the MCU signal, the output end of the second OR gate is connected to the first signal end of the second switch tube, the second signal end of the second switch tube is connected to the key electric relay signal of the car, and the output end of the second switch tube is respectively connected to the signal detection circuit and logic processing circuit signal of each group.

[0034] Optionally, the second input terminal of the second OR gate is connected to the overvoltage fault terminal signal of the power supply of the vehicle, and the third input terminal of the second OR gate is connected to the undervoltage fault terminal signal of the power supply of the vehicle.

[0035] In a second aspect, the present invention provides an automobile, comprising an automobile system circuit and a vehicle body, wherein the automobile system circuit is installed on the vehicle body, and the automobile system circuit is the automobile system circuit supporting switch shutdown and realizing limp home mode as described in any one of the first aspects above.

[0036] As can be seen from the above content, an automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention includes a fault output circuit and at least one group of control logic modules, each group of control logic modules includes a MOSFET, a signal detection circuit, a logic processing circuit and a latch circuit, the signal detection circuit and the logic processing circuit of each group of control logic modules are both connected to the fault output circuit signal, and the fault output circuit is also connected to the MCU signal of the automobile, for each group of control logic modules, the first end of the MOSFET of the group is connected to the power signal of the automobile, the second end of the MOSFET of the group is connected to the logic processing circuit signal of the group, the logic processing circuit of the group is connected to the MCU signal, the third end of the MOSFET of the group is respectively connected to the load of the automobile and the latch circuit signal of the group, the signal detection circuit of the group is respectively connected to the one-button start switch of the automobile and the latch circuit signal of the group, the latch circuit of the group is connected to the logic processing circuit signal of the group, the fault output circuit detects that the MCU has a fault, and outputs a fault signal enable signal to the signal detection circuit and the logic processing circuit of each group of control logic modules respectively, for each group of control logic modules, the signal detection circuit of the group is connected to the logic processing circuit of the group. After receiving the fault signal enable signal, the signal detection circuit switches from the normal working state to the limp mode state, and detects whether the one-button start switch is pressed. After receiving the fault signal enable signal, the logic processing circuit of the group switches from the normal working state to the limp mode state, and shields the system signal sent by the MCU. When the signal detection circuit of the group detects that the one-button start switch is not pressed, it sends a takeover instruction to the latch circuit of the group. The latch circuit of the group receives the takeover instruction sent by the signal detection circuit of the group, collects the working state information of the MOSFET of the group before the MCU fails as the current working state information and sends it to the logic processing circuit of the group. The logic processing circuit of the group receives the current working state information sent by the latch circuit of the group, and controls the MOSFET of the group to turn on or off based on the current working state information. When the signal detection circuit of the group detects that the one-button start switch is pressed, it sends a close instruction to the latch circuit of the group. The latch circuit of the group receives the close instruction sent by the signal detection circuit of the group, and sends the close instruction to the logic processing circuit of the group. The logic processing circuit of the group receives the close instruction sent by the latch circuit of the group, and turns off the MOSFET of the group.Therefore, in the embodiment of the present invention, when the MCU fails and enters the limp mode state and the one-button start switch is not pressed, the latch circuit can take over the logic processing circuit, so that the MOSFET is controlled by the logic processing circuit to maintain the working state before the MCU fails, that is, the load is maintained in the working state before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally, rather than turning on the load function, thereby improving the safety of the vehicle. When the one-button start switch is pressed, the latch circuit sends a shutdown instruction to the logic processing circuit, thereby controlling the MOSFET to be turned off by the logic processing circuit, that is, turning off the load, avoiding the situation where the function of the turned-on load cannot be turned off even after the vehicle stops, thereby improving convenience.

[0037] The innovative features of the embodiments of the present invention include:

[0038] 1. When the MCU fails and enters the limp mode state and the one-button start switch is not pressed, the latch circuit can take over the logic processing circuit, so that the logic processing circuit controls the MOSFET to maintain the working state before the MCU fails, that is, the load is maintained in the working state before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally, rather than turning on the load function, thereby improving the safety of the vehicle. When the one-button start switch is pressed, the latch circuit sends a shutdown instruction to the logic processing circuit, thereby controlling the MOSFET to turn off through the logic processing circuit, that is, turning off the load, avoiding the situation where the function of the turned-on load cannot be turned off even after the vehicle is parked, thereby improving convenience.

[0039] 2. An automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention is constructed by pure hardware, with low labor costs and faster development cycle.

[0040] 3. An automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention can be independent of the overall function of the automobile and form a module, thereby improving the degree of modularization. When not needed, the automobile system circuit supporting switch shutdown and realizing limp home mode can be dismantled, which is flexible, convenient, and easy to control costs.

[0041] 4. Prevent the power supply from being connected in reverse by installing a power reverse protector between the car's power supply and MOSFET.

[0042] 5. After the fault output circuit detects that the MCU has returned to normal, the signal detection circuit of each group is controlled to stop detecting whether the one-button start switch is pressed, and the logic processing circuit of each group is controlled to continue to work normally according to the system instructions issued by the MCU, so as to keep the vehicle working normally.

[0043] 6. By setting a voltage comparator, when the one-button start switch is not pressed, the voltage at the comparison end of the voltage comparator is greater than the voltage at the reference source end, and the voltage comparator outputs a high level to the latch circuit, that is, sending a takeover instruction to the latch circuit, thereby controlling the MOSFET through the logic processing circuit to maintain the working state before the MCU fails. When the one-button start switch is pressed, the voltage at the comparison end of the voltage comparator is less than the voltage at the reference source end, and the voltage comparator outputs a low level to the latch circuit, that is, sending a shutdown instruction to the latch circuit, thereby controlling the MOSFET to close through the logic processing circuit.

[0044] 7. By adopting a driver chip that supports level switching function, SPI control function and level control function, the logic processing circuit is switched from the normal working state to the limp mode state after receiving the fault signal enable signal, and the system signal sent by the MCU is shielded. At the same time, the current working state information sent by the latch circuit is received, and the MOSFET is controlled to be turned on or off based on the current working state information. After the MCU returns to normal, the recovery control instruction is received, the system signal sent by the MCU is received again, and the normal operation is continued according to the system instruction sent by the MCU.

[0045] 8. In order to ensure that each group of latch circuits can work normally, the MCU sends an activation command to each group of latch circuits to activate each latch circuit when the car is started.

[0046] 9. By setting a three-state single buffer gate, the latch circuit receives the takeover instruction sent by the signal detection circuit, collects the working status information of the MOSFET before the MCU fails and sends it to the logic processing circuit as the current working status information, and then controls the working status of the MOSFET to remain the same as before the MCU fails, thereby ensuring that the vehicle is not affected by the MCU failure and works normally, and realizes the latch circuit receives the shutdown instruction sent by the signal detection circuit, and sends the shutdown instruction to the logic processing circuit, thereby turning off the MOSFET, thereby achieving the purpose of turning off the load.

[0047] 10. By setting the second OR gate and the second switch tube, the fault output circuit detects that the MCU has a fault and outputs a fault signal enable signal to the signal detection circuit and the logic processing circuit respectively.

[0048] 11. By setting the second input terminal of the second OR gate to be connected to the overvoltage fault terminal signal of the car's power supply, and the third input terminal of the second OR gate to be connected to the undervoltage fault terminal signal of the car's power supply, the load is turned off when an overvoltage fault or undervoltage fault occurs in the power supply.

[0049] 12. An automobile provided by an embodiment of the present invention includes an automobile system circuit and a vehicle body. The automobile system circuit is installed on the vehicle body. When the MCU fails and enters the limp mode state and the one-button start switch is not pressed, the automobile system circuit can take over the logic processing circuit through a latch circuit, so that the MOSFET is controlled by the logic processing circuit to maintain the working state before the MCU fails, that is, the load is maintained in the working state before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally instead of turning on certain functions, thereby improving the safety of the vehicle. When the one-button start switch is pressed, the latch circuit sends a shutdown instruction to the logic processing circuit, thereby controlling the MOSFET to be turned off through the logic processing circuit, that is, turning off the load, avoiding the situation that the function of the turned-on load cannot be turned off even after the vehicle stops, thereby improving convenience.

[0050] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

[0052] Figure 1 A schematic diagram of a structure of an automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention;

[0053] Figure 2 A schematic diagram of the structure of a signal detection circuit provided by an embodiment of the present invention;

[0054] Figure 3 A schematic diagram of the structure of a logic processing circuit provided by an embodiment of the present invention;

[0055] Figure 4 A schematic diagram of the structure of a latch circuit provided by an embodiment of the present invention;

[0056] Figure 5 A schematic diagram of the structure of a fault output circuit provided by an embodiment of the present invention;

[0057] Figure 6 A schematic structural diagram of a car provided by an embodiment of the present invention.

[0058] Figure 1-Figure 6 Among them, 1 fault output circuit, 11 second OR gate, 12 second switch tube, 2 MOSFET, 3 signal detection circuit, 31 first resistor, 32 second resistor, 33 third resistor, 34 fourth resistor, 35 voltage comparator, 36 voltage source, 37 first switch tube, 4 logic processing circuit, 5 latch circuit, 51 NOT gate, 52 first OR gate, 53 first diode, 54 second diode, 55 three-state single buffer gate, 6 power supply, 7 load, 8 one-button start switch, 9 power supply anti-reverse device, 10 key electric relay, 20 automobile system circuit, 21 car body. DETAILED DESCRIPTION

[0059] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0061] The embodiment of the present invention discloses an automobile system circuit and an automobile that supports switch off and realizes limp home mode, which can improve safety and convenience. The embodiment of the present invention is described in detail below.

[0062] Figure 1 A schematic diagram of a circuit structure of an automobile system that supports switch shutdown and implements limp home mode provided by an embodiment of the present invention. Figure 1 An automotive system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention includes a fault output circuit 1 and at least one group of control logic modules, each group of control logic modules includes a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) 2, a signal detection circuit 3, a logic processing circuit 4 and a latch circuit 5.

[0063] The signal detection circuit 3 and the logic processing circuit 4 of each control logic module are both connected to the fault output circuit 1 by signal, and the fault output circuit 1 is also connected to the MCU (Microcontroller Unit) of the vehicle by signal.

[0064] For each group of control logic modules, the first end of the MOSFET2 of the group is signal-connected to the power supply 6 of the car, the second end of the MOSFET2 of the group is signal-connected to the logic processing circuit 4 of the group, the logic processing circuit 4 of the group is signal-connected to the MCU, the third end of the MOSFET2 of the group is signal-connected to the load 7 of the car and the latch circuit 5 of the group respectively, the signal detection circuit 3 of the group is signal-connected to the one-button start switch 8 of the car and the latch circuit 5 of the group respectively, and the latch circuit 5 of the group is signal-connected to the logic processing circuit 4 of the group.

[0065] The load 7 may be a windshield wiper, an oil pump or a brake light. The number of control logic modules is the same as the number of loads 7 to be controlled.

[0066] Continue to see Figure 1 An automobile system circuit package supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention also includes a power anti-reverse device 9.

[0067] For each group of control logic modules, the first end of the MOSFET 2 of the group is signal-connected to the power reverse preventer 9 , and the power reverse preventer 9 is signal-connected to the power supply 6 of the vehicle.

[0068] Therefore, by installing a power reverse connection preventer 9 between the power supply 6 of the vehicle and the MOSFET 2, the power reverse connection is prevented.

[0069] When the MCU is working normally, the fault output circuit 1 has no output, and the logic processing circuits 4 of each group are in a normal working state and work normally according to the system instructions issued by the MCU.

[0070] When the fault output circuit 1 detects that the MCU has a fault, it outputs a fault signal enable signal to the signal detection circuit 3 and the logic processing circuit 4 of each group of control logic modules.

[0071] For each group of control logic modules, the signal detection circuit 3 of the group receives the fault signal enable signal and learns that the MCU fails, then switches from the normal working state to the limp home mode state, and detects whether the one-button start switch 8 is pressed.

[0072] The logic processing circuit 4 of this group learns that the MCU fails after receiving the fault signal enable signal, and then switches from the normal working state to the limp mode state, and shields the system signal sent by the MCU to prevent the wrong system signal from participating in the control.

[0073] When the signal detection circuit 3 of the group detects that the one-touch start switch 8 is not pressed, it means that there is no need to stop the vehicle at this time and the vehicle needs to continue to work normally, and a takeover instruction is sent to the latch circuit 5 of the group.

[0074] The latch circuit 5 of the group receives the takeover instruction sent by the signal detection circuit 3 of the group. At this time, the control of the logic processing circuit 4 of the group is taken over by the latch circuit 5 of the group. The latch circuit 5 of the group collects the working status information of the MOSFET2 of the group before the MCU fails and sends it to the logic processing circuit 4 of the group as the current working status information.

[0075] The logic processing circuit 4 of the group receives the current working status information sent by the latch circuit 5 of the group, and controls the MOSFET2 of the group to turn on or off based on the current working status information. If the current working status information is to turn on MOSFET2, the logic processing circuit 4 turns on the MOSFET2 of the group, otherwise it turns off the MOSFET2 of the group. That is to say, when the one-button start switch 8 is not pressed, the latch circuit 5 of the group controls the working status of the MOSFET2 of the group through the logic processing circuit 4 of the group to remain the same as before the MCU fails, that is, maintains the working status of the load 7 before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally.

[0076] When the signal detection circuit 3 of the group detects that the one-button start switch 8 is pressed, it means that the vehicle needs to be stopped and the load 7 needs to be turned off by turning off the MOSFET 2 of the group. Therefore, a shutdown instruction is sent to the latch circuit 5 of the group.

[0077] The latch circuit 5 of the group receives the shutdown instruction sent by the signal detection circuit 3 of the group, and sends the shutdown instruction to the logic processing circuit 4 of the group. The logic processing circuit 4 of the group receives the shutdown instruction sent by the latch circuit 5 of the group, and turns off the MOSFET2 of the group. After the MOSFET2 of the group is turned off, the load 7 connected to the MOSFET2 is also turned off, thereby achieving the purpose of turning off the load 7.

[0078] Since the MCU may be in a short-term fault, when the fault output circuit 1 detects that the MCU has returned to normal, it sends a stop detection instruction to each group of signal detection circuits 3 and a recovery control instruction to each group of logic processing circuits 4.

[0079] For each group of control logic modules, the signal detection circuit 3 of the group stops detecting whether the one-button start switch 8 is pressed after receiving the stop detection instruction. After receiving the resume control instruction, the logic processing circuit 4 of the group receives the system signal sent by the MCU again and continues to work normally according to the system instruction sent by the MCU.

[0080] Therefore, after the fault output circuit 1 detects that the MCU has returned to normal, by sending a stop detection instruction to each group of signal detection circuits 3 and a recovery control instruction to each group of logic processing circuits 4, the signal detection circuit 3 of each group is controlled to stop detecting whether the one-button start switch 8 is pressed, and the logic processing circuit 4 of each group is controlled to continue to work normally according to the system instructions issued by the MCU, thereby keeping the vehicle working normally.

[0081] An automotive system circuit supporting switch off and realizing limp home mode provided by an embodiment of the present invention comprises a fault output circuit 1 and at least one group of control logic modules, each group of control logic modules comprises a MOSFET 2, signal detection circuit 3, logic processing circuit 4 and latch circuit 5, the signal detection circuit 3 and logic processing circuit 4 of each control logic module are connected to the fault output circuit 1 signal, the fault output circuit 1 is also connected to the MCU signal of the car, for each control logic module, the first end of the MOSFET2 of the group is connected to the power supply 6 of the car signal, the second end of the MOSFET2 of the group is connected to the logic processing circuit 4 of the group, the logic processing circuit 4 of the group is connected to the MCU signal, the third end of the MOSFET2 of the group is respectively connected to the load 7 of the car and the latch circuit 5 of the group, the signal detection circuit 3 of the group is respectively connected to the one-button start switch 8 of the car and the latch circuit 5 of the group, the latch circuit 5 of the group is connected to the logic processing circuit 4 of the group, the fault output circuit 1 detects that the MCU has a fault, and outputs a fault signal enable signal to the signal detection circuit 3 and logic processing circuit 4 of each control logic module, for each control logic module, the signal detection circuit 3 of the group switches from the normal working state to the limp mode state after receiving the fault signal enable signal, and detects Whether the one-button start switch 8 is pressed, the logic processing circuit 4 of the group switches from the normal working state to the limp mode state after receiving the fault signal enable signal, and shields the system signal sent by the MCU. When the signal detection circuit 3 of the group detects that the one-button start switch 8 is not pressed, it sends a takeover instruction to the latch circuit 5 of the group. The latch circuit 5 of the group receives the takeover instruction sent by the signal detection circuit 3 of the group, collects the working state information of the MOSFET2 of the group before the MCU fails as the current working state information and sends it to the logic processing circuit 4 of the group. The logic processing circuit 4 of the group receives the current working state information sent by the latch circuit 5 of the group, and controls the MOSFET2 of the group to turn on or off based on the current working state information. When the signal detection circuit 3 of the group detects that the one-button start switch 8 is pressed, it sends a close instruction to the latch circuit 5 of the group. The latch circuit 5 of the group receives the close instruction sent by the signal detection circuit 3 of the group, and sends the close instruction to the logic processing circuit 4 of the group. The logic processing circuit 4 of the group receives the close instruction sent by the latch circuit 5 of the group, and turns off the MOSFET2 of the group.Therefore, in the embodiment of the present invention, when the MCU fails and enters the limp mode state and the one-touch start switch 8 is not pressed, the latch circuit can take over the logic processing circuit 4, so that the logic processing circuit 4 controls the MOSFET2 to maintain the working state before the MCU fails, that is, the load 7 is maintained in the working state before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally, rather than turning on the load function, thereby improving the safety of the vehicle. When the one-touch start switch 8 is pressed, the latch circuit 5 sends a shutdown instruction to the logic processing circuit 4, thereby controlling the MOSFET2 to be turned off through the logic processing circuit 4, that is, turning off the load 7, avoiding the situation where the function of the turned-on load cannot be turned off even after the vehicle stops, thereby improving convenience.

[0082] Furthermore, an automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention is constructed by pure hardware, with lower labor costs and faster development cycle.

[0083] Furthermore, an automobile system circuit supporting switch shutdown and realizing limp home mode provided by an embodiment of the present invention can be independent of the overall function of the automobile and form a module in itself, thereby improving the degree of modularization. When not needed, the automobile system circuit supporting switch shutdown and realizing limp home mode can be removed, which is flexible, convenient, and easy to control costs.

[0084] Figure 2 A schematic diagram of the structure of the signal detection circuit provided by the embodiment of the present invention is shown in FIG. Figure 2 The signal detection circuit 3 of each group includes a first resistor 31, a second resistor 32, a third resistor 33, a fourth resistor 34, a voltage comparator 35, a voltage source 36 and a first switch tube 37. For the voltage comparator 35, when the positive voltage is greater than the negative voltage, a high level is output, and the first switch tube 37 can be an NPN transistor or an NMOS (N-Metal-Oxide-Semiconductor) tube.

[0085] The one-button start switch 8 is connected in parallel with the first resistor 31, one end of the first resistor 31 is grounded, and the other end is signal-connected to one end of the second resistor 32, the other end of the second resistor 32 is signal-connected to one end of the third resistor 33 and the comparison end of the voltage comparator 35 respectively, the other end of the third resistor 33 is signal-connected to the fault output circuit 1, the reference source end of the voltage comparator 35 is grounded via the voltage source 36, wherein the other end of the third resistor 33 is signal-connected to the reference voltage end of the fault output circuit 1.

[0086] Continue to see Figure 2One end of the fourth resistor 34 is signal-connected to the fault output circuit 1, and the other end is signal-connected to the positive power supply end of the voltage comparator 35 and the latch circuit 5 of the group respectively, the negative power supply end of the voltage comparator 35 is grounded, the output end of the voltage comparator 35 is signal-connected to the first signal end of the first switch tube 37, the output end of the first switch tube 37 is signal-connected to the latch circuit 5 of the group, and the second signal end of the first switch tube 37 is grounded, wherein one end of the fourth resistor 34 is signal-connected to the fault voltage end of the fault output circuit 1.

[0087] The working principle of the signal detection circuit 3 is:

[0088] When the fault voltage is activated, that is, when the fault signal enable signal is received, the voltage comparator 35 starts to work, and when the signal detection circuit 3 detects that the one-button start switch 8 is not pressed, the voltage at the comparison end of the voltage comparator 35 is greater than the voltage at the reference source end, and the voltage comparator 35 outputs a high level to the latch circuit 5, that is, sends a takeover instruction to the latch circuit 5, thereby controlling the MOSFET 2 through the logic processing circuit 4 to maintain the working state before the MCU fails;

[0089] When the signal detection circuit 3 detects that the one-button start switch 8 is pressed, the voltage at the comparison end of the voltage comparator 35 is less than the voltage at the reference source end, and the voltage comparator 35 outputs a low level to the latch circuit 5, that is, sends a shutdown instruction to the latch circuit 5, thereby controlling the MOSFET2 to be turned off through the logic processing circuit 4.

[0090] Therefore, by setting the voltage comparator 35, when the one-button start switch 8 is not pressed, the voltage at the comparison end of the voltage comparator 35 is greater than the voltage at the reference source end, and the voltage comparator 35 outputs a high level to the latch circuit 5, that is, sending a takeover instruction to the latch circuit 5, thereby controlling the MOSFET2 to maintain the working state before the MCU fails through the logic processing circuit 4. When the one-button start switch 8 is pressed, the voltage at the comparison end of the voltage comparator 35 is less than the voltage at the reference source end, and the voltage comparator 35 outputs a low level to the latch circuit 5, that is, sending a shutdown instruction to the latch circuit 5, thereby controlling the MOSFET2 to be closed through the logic processing circuit 4.

[0091] Figure 3 For a schematic diagram of the structure of the logic processing circuit provided by the embodiment of the present invention, see Figure 3 The logic processing circuit 4 of each group is a driving chip supporting level switching function, SPI (Serial Peripheral Interface) control function and level control function.

[0092] Exemplarily, the logic processing circuit 4 of each group may be a ROHM chip BD8LA700.

[0093] Among them, the level switching function refers to switching from the normal working state to the limp mode state after receiving the fault enable signal; the SPI control function refers to receiving or shielding the system signal sent by the MCU; and the level control function refers to being controlled by the latch module 5.

[0094] The working principle of the logic processing circuit 4 is:

[0095] After receiving the fault signal enable signal, it switches from the normal working state to the limp mode state, and shields the system signal sent by the MCU. At the same time, it receives the current working state information sent by the latch circuit 5, and controls MOSFET2 to be turned on or off based on the current working state information. After the MCU returns to normal, it receives the recovery control instruction, re-receives the system signal sent by the MCU, and continues to work normally according to the system instruction sent by the MCU.

[0096] Therefore, by adopting a driving chip that supports level switching function, SPI control function and level control function, the logic processing circuit 4 can switch from the normal working state to the limp mode state after receiving the fault signal enable signal, and shield the system signal sent by the MCU, while receiving the current working state information sent by the latch circuit 5, and controlling the MOSFET2 to turn on or off based on the current working state information. After the MCU returns to normal, it receives the recovery control instruction, re-receives the system signal sent by the MCU, and continues to work normally according to the system instruction sent by the MCU.

[0097] In one implementation, the latch circuit 5 of each group is also connected to the MCU signal;

[0098] When the car is started, the MCU sends an activation instruction to each group of latch circuits 5 to activate each latch circuit 5 .

[0099] In order to ensure that each group of latch circuits 5 can work normally, the MCU sends an activation instruction to each group of latch circuits 5 to activate each latch circuit when the car is started.

[0100] Figure 4 For a schematic diagram of the structure of a latch circuit provided in an embodiment of the present invention, see Figure 4 When the latch circuit 5 of each group is also connected to the MCU signal, the latch circuit 5 of each group includes a NOT gate 51, a first OR gate 52, a first diode 53, a second diode 54 and a three-state single buffer gate 55.

[0101] The input end of the NOT gate 51 is signal-connected to the MOSFET2 of the group, the output end of the NOT gate 51 is signal-connected to the first input end of the first OR gate 52, the second input end of the first OR gate 52 is signal-connected to the signal detection circuit 3 of the group, the output end of the first OR gate 52 is signal-connected to the output enable end of the three-state single buffer gate 55, the anode of the first diode 53 is signal-connected to the MCU, the cathode of the first diode 53 is respectively signal-connected to the cathode of the second diode 54 and the input end of the three-state single buffer gate 55, the output end of the three-state single buffer gate 55 is signal-connected to the logic processing circuit 4 of the group, and the anode of the second diode 54 is signal-connected to the logic processing circuit 4 of the group.

[0102] Among them, for the three-state single buffer gate 55, when the output enable terminal is at a low level, the output terminal follows the output enable terminal and is also at a low level; when the output enable terminal is at a high level, the output terminal is in a high impedance state and has no output.

[0103] The working principle of latch circuit 5 is:

[0104] When the shutdown instruction is at a low level and the driving output state, that is, the working state of MOSFET2 is at a high level, the first OR gate 52 outputs a low level, and the MCU inputs a high level signal to the three-state single buffer gate 55 according to the current working state, and the three-state single buffer gate 55 outputs the working state as a high level to the logic processing circuit 4, that is, the latch circuit 5 receives the takeover instruction sent by the signal detection circuit 3, and the latch circuit 5 collects the working state information of MOSFET2 before the MCU fails and sends it to the logic processing circuit 4 as the current working state information;

[0105] When the shutdown instruction is pulled high or the drive output is turned off, that is, MOSFET2 is turned off and dropped to a low level, the first OR gate 52 outputs a high level to the output enable terminal of the three-state single buffer gate 55. At this time, the output terminal of the three-state single buffer gate 55 is in a high-impedance state. At the same time, since the drive output, that is, the working state of MOSFET2 is controlled by the working state of the three-state single buffer gate 55, the drive output, that is, the working state of MOSFET2 is low, maintaining the high level of the output enable terminal of the three-state single buffer gate 55 and the output working state of the three-state single buffer gate 55 is low to the logic processing circuit 4. That is, the latch circuit 5 receives the shutdown instruction sent by the signal detection circuit 3, and sends the shutdown instruction to the logic processing circuit 4.

[0106] Therefore, by setting a three-state single buffer gate 55, the latch circuit 5 receives the takeover instruction sent by the signal detection circuit 3, collects the working status information of MOSFET2 before the MCU fails and sends it to the logic processing circuit 4 as the current working status information, and then controls the working status of MOSFET2 to remain the same as before the MCU fails, thereby ensuring that the vehicle is not affected by the MCU failure and works normally, and the latch circuit 5 receives the shutdown instruction sent by the signal detection circuit 3, and sends the shutdown instruction to the logic processing circuit 4, thereby turning off MOSFET2, thereby achieving the purpose of turning off the load 7.

[0107] Figure 5 A schematic diagram of the structure of the fault output circuit 1 provided in an embodiment of the present invention is shown in FIG. Figure 5 The fault output circuit 1 includes a second OR gate 11 and a second switch tube 12. The second switch tube 12 may be a PNP transistor or a PMOS (positive channel Metal Oxide Semiconductor).

[0108] The first input end of the second OR gate 11 is connected to the MCU signal, the output end of the second OR gate 11 is connected to the first signal end of the second switch tube 12, the second signal end of the second switch tube 12 is connected to the key electric relay 10 of the car, and the output end of the second switch tube 12 is respectively connected to the signal detection circuit 3 and the logic processing circuit 4 of each group.

[0109] The working principle of the fault output circuit 1 is:

[0110] When the key electric relay 10 outputs the key power normally and the fault signal output by the MCU is at a high level, the second OR gate 11 outputs a low level, the second switch tube 12 is turned on, and the second switch tube 12 outputs a fault enable signal at a high level, that is, the fault output circuit 1 detects that the MCU has a fault, and outputs a fault signal enable signal to the signal detection circuit 3 and the logic processing circuit 4 respectively;

[0111] If there is no key power or the MCU does not output a fault signal, the second switch tube 12 outputs a fault enable signal of low level, that is, the MCU does not fail and does not output a fault signal enable signal.

[0112] Therefore, by setting the second OR gate 11 and the second switch tube 12, the fault output circuit 1 detects that the MCU has a fault and outputs a fault signal enable signal to the signal detection circuit 3 and the logic processing circuit 4 respectively.

[0113] Continue to see Figure 5Since the power supply 6 of the car may fail sometimes, the second input terminal and the third input terminal of the second OR gate 11 are both connected to the signal of the power supply 6 of the car. The second input terminal is connected to the overvoltage fault terminal signal of the power supply 6 of the car, and the third input terminal is connected to the undervoltage fault terminal signal of the power supply 6 of the car.

[0114] When the key electric relay 10 outputs key power normally and the overvoltage signal / undervoltage signal output by the power supply 6 is at a high level, the second OR gate 11 outputs a low level, the second switch tube 12 is turned on, and the second switch tube 12 outputs a power fault signal at a high level, that is, the fault output circuit 1 detects an overvoltage fault / undervoltage fault in the power supply, and outputs a power fault signal to the signal detection circuit 3 and the logic processing circuit 4 respectively.

[0115] The subsequent process is the same as that when the MCU fails, so it will not be repeated here.

[0116] Therefore, by setting the second input terminal of the second OR gate 11 to be connected to the overvoltage fault terminal signal of the power supply 6 of the car, and the third input terminal of the second OR gate 11 to be connected to the undervoltage fault terminal signal of the power supply 6 of the car, the load 7 is turned off when an overvoltage fault or an undervoltage fault occurs in the power supply 6.

[0117] Figure 6 A schematic diagram of the structure of a car provided by an embodiment of the present invention, Figure 6 An embodiment of the present invention provides an automobile, including an automobile system circuit 20 and a vehicle body 21. The automobile system circuit 20 is installed on the vehicle body 21. The automobile system circuit 20 is an automobile system circuit that supports switch shutdown and realizes limp home mode provided by any of the above embodiments.

[0118] Thus, an automobile provided by an embodiment of the present invention includes an automobile system circuit 20 and a vehicle body 21, wherein the automobile system circuit 20 is installed on the vehicle body 21, and the automobile system circuit 20 includes a fault output circuit 1 and at least one group of control logic modules, each group of control logic modules includes a MOSFET 2, signal detection circuit 3, logic processing circuit 4 and latch circuit 5, the signal detection circuit 3 and logic processing circuit 4 of each control logic module are connected to the fault output circuit 1 signal, the fault output circuit 1 is also connected to the MCU signal of the car, for each control logic module, the first end of the MOSFET2 of the group is connected to the power supply 6 of the car signal, the second end of the MOSFET2 of the group is connected to the logic processing circuit 4 of the group, the logic processing circuit 4 of the group is connected to the MCU signal, the third end of the MOSFET2 of the group is respectively connected to the load 7 of the car and the latch circuit 5 of the group, the signal detection circuit 3 of the group is respectively connected to the one-button start switch 8 of the car and the latch circuit 5 of the group, the latch circuit 5 of the group is connected to the logic processing circuit 4 of the group, the fault output circuit 1 detects that the MCU has a fault, and outputs a fault signal enable signal to the signal detection circuit 3 and logic processing circuit 4 of each control logic module, for each control logic module, the signal detection circuit 3 of the group switches from the normal working state to the limp mode state after receiving the fault signal enable signal, and detects Whether the one-button start switch 8 is pressed, the logic processing circuit 4 of the group switches from the normal working state to the limp mode state after receiving the fault signal enable signal, and shields the system signal sent by the MCU. When the signal detection circuit 3 of the group detects that the one-button start switch 8 is not pressed, it sends a takeover instruction to the latch circuit 5 of the group. The latch circuit 5 of the group receives the takeover instruction sent by the signal detection circuit 3 of the group, collects the working state information of the MOSFET2 of the group before the MCU fails as the current working state information and sends it to the logic processing circuit 4 of the group. The logic processing circuit 4 of the group receives the current working state information sent by the latch circuit 5 of the group, and controls the MOSFET2 of the group to turn on or off based on the current working state information. When the signal detection circuit 3 of the group detects that the one-button start switch 8 is pressed, it sends a close instruction to the latch circuit 5 of the group. The latch circuit 5 of the group receives the close instruction sent by the signal detection circuit 3 of the group, and sends the close instruction to the logic processing circuit 4 of the group. The logic processing circuit 4 of the group receives the close instruction sent by the latch circuit 5 of the group, and turns off the MOSFET2 of the group.Therefore, in the embodiment of the present invention, when the MCU fails and enters the limp mode state and the one-touch start switch 8 is not pressed, the latch circuit can take over the logic processing circuit 4, so that the logic processing circuit 4 controls the MOSFET2 to maintain the working state before the MCU fails, that is, the load 7 is maintained in the working state before the MCU fails, thereby ensuring that the function of the vehicle's load is not affected by the MCU failure and works normally, rather than turning on the load function, thereby improving the safety of the vehicle. When the one-touch start switch 8 is pressed, the latch circuit 5 sends a shutdown instruction to the logic processing circuit 4, thereby controlling the MOSFET2 to be turned off through the logic processing circuit 4, that is, turning off the load 7, avoiding the situation where the function of the turned-on load cannot be turned off even after the vehicle stops, thereby improving convenience.

[0119] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0120] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automotive system circuit supporting switch off and realizing limp home mode, characterized in that: include: A fault output circuit and at least one set of control logic modules, each set of control logic modules includes a metal oxide semiconductor field effect transistor MOSFET, a signal detection circuit, a logic processing circuit and a latch circuit; The signal detection circuit and logic processing circuit of each control logic module are connected to the fault output circuit signal, and the fault output circuit is also connected to the micro control unit MCU of the vehicle signal; For each group of control logic modules, the first end of the MOSFET of the group is connected to the power signal of the car, the second end of the MOSFET of the group is connected to the logic processing circuit signal of the group, the logic processing circuit of the group is connected to the MCU signal, the third end of the MOSFET of the group is respectively connected to the load of the car and the latch circuit signal of the group, the signal detection circuit of the group is respectively connected to the one-button start switch of the car and the latch circuit signal of the group, and the latch circuit of the group is connected to the logic processing circuit signal of the group; The fault output circuit detects that the MCU fails and outputs a fault signal enable signal to the signal detection circuit and logic processing circuit of each group of control logic modules respectively; For each group of control logic modules, the signal detection circuit of the group switches from a normal working state to a limp home mode state after receiving the fault signal enable signal, and detects whether the one-button start switch is pressed; The logic processing circuit of the group switches from a normal working state to a limp mode state after receiving the fault signal enable signal, and shields the system signal sent by the MCU; When the signal detection circuit of the group detects that the one-key start switch is not pressed, a takeover instruction is sent to the latch circuit of the group; The latch circuit of the group receives the takeover instruction sent by the signal detection circuit of the group, collects the working state information of the MOSFET of the group before the MCU fails, and sends it to the logic processing circuit of the group as the current working state information; The logic processing circuit of the group receives the current working state information sent by the latch circuit of the group, and controls the MOSFET of the group to turn on or off based on the current working state information; When the signal detection circuit of the group detects that the one-key start switch is pressed, a closing instruction is sent to the latch circuit of the group; The latch circuit of the group receives the closing instruction sent by the signal detection circuit of the group, and sends the closing instruction to the logic processing circuit of the group; The logic processing circuit of the group receives the shutdown instruction sent by the latch circuit of the group and turns off the MOSFET of the group.

2. The automobile system circuit supporting switch shutdown and realizing limp home mode as claimed in claim 1, characterized in that: After the fault output circuit detects that the MCU has returned to normal, it sends a stop detection instruction to each group of signal detection circuits and a recovery control instruction to each group of logic processing circuits; For each group of control logic modules, the signal detection circuit of the group stops detecting whether the one-key start switch is pressed after receiving the stop detection instruction; After receiving the recovery control instruction, the logic processing circuit of the group receives the system signal sent by the MCU again.

3. The automobile system circuit supporting switch shutdown and realizing limp home mode according to claim 1 or 2, characterized in that: Also includes a power reverse preventer; For each group of control logic modules, the first end of the MOSFET of the group is connected to the power reverse preventer signal, and the power reverse preventer is connected to the power signal of the car.

4. The automobile system circuit supporting switch off and realizing limp home mode according to claim 1 or 2, characterized in that: The signal detection circuit of each group includes a first resistor, a second resistor, a third resistor, a fourth resistor, a voltage comparator, a voltage source and a first switch tube; The one-key start switch is connected in parallel with the first resistor, one end of the first resistor is grounded, and the other end is signal-connected to one end of the second resistor, the other end of the second resistor is signal-connected to one end of the third resistor and the comparison end of the voltage comparator respectively, the other end of the third resistor is signal-connected to the fault output circuit, and the reference source end of the voltage comparator is grounded via the voltage source; One end of the fourth resistor is connected to the fault output circuit signal, and the other end is respectively connected to the positive power supply end of the voltage comparator and the latch circuit signal of the group. The negative power supply end of the voltage comparator is grounded, the output end of the voltage comparator is connected to the first signal end signal of the first switch tube, the output end of the first switch tube is connected to the latch circuit signal of the group, and the second signal end of the first switch tube is grounded.

5. The automobile system circuit supporting switch shutdown and realizing limp home mode as claimed in claim 1, characterized in that: The logic processing circuit of each group is a driver chip that supports level switching function, serial peripheral interface SPI control function and level control function.

6. The automobile system circuit supporting switch off and realizing limp home mode as claimed in claim 1, characterized in that: The latch circuit of each group is also connected to the MCU signal; When the car is started, the MCU sends an activation instruction to each group of latch circuits to activate each latch circuit.

7. The automobile system circuit supporting switch off and realizing limp home mode as claimed in claim 6, characterized in that: The latch circuit of each group includes a NOT gate, a first OR gate, a first diode, a second diode and a three-state single buffer gate; The input end of the NOT gate is connected to the MOSFET signal of the group, the output end of the NOT gate is connected to the first input end signal of the first OR gate, the second input end of the first OR gate is connected to the signal of the signal detection circuit of the group, the output end of the first OR gate is connected to the output enable end signal of the three-state single buffer gate, the anode of the first diode is connected to the MCU signal, the cathode of the first diode is respectively connected to the cathode of the second diode and the input end signal of the three-state single buffer gate, the output end of the three-state single buffer gate is connected to the logic processing circuit signal of the group, and the anode of the second diode is connected to the logic processing circuit signal of the group.

8. The automobile system circuit supporting switch shutdown and realizing limp home mode as claimed in claim 1, characterized in that: The fault output circuit includes a second OR gate and a second switch tube; The first input end of the second OR gate is connected to the MCU signal, the output end of the second OR gate is connected to the first signal end of the second switch tube, the second signal end of the second switch tube is connected to the key electric relay signal of the car, and the output end of the second switch tube is respectively connected to the signal detection circuit and logic processing circuit signal of each group.

9. The automobile system circuit supporting switch off and realizing limp home mode as claimed in claim 8, characterized in that: The second input terminal of the second OR gate is connected to the overvoltage fault terminal signal of the power supply of the vehicle, and the third input terminal of the second OR gate is connected to the undervoltage fault terminal signal of the power supply of the vehicle.

10. An automobile, characterized in that: The invention comprises an automobile system circuit and a vehicle body, wherein the automobile system circuit is installed on the vehicle body, and the automobile system circuit is the automobile system circuit supporting switch off and realizing limp home mode as claimed in any one of claims 1 to 9.

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