Vehicle interlocking detection system and control method thereof

Abstract

The invention provides a vehicle interlocking detection system and a control method thereof. A high-voltage zero connector, an interlocking detection circuit and a low-voltage zero connector are arranged in a high-voltage part; one side of the high-voltage zero connector is connected with a high-voltage power supply through a power switch, a first interlocking terminal and a second interlocking terminal which are arranged on the other side of the high-voltage zero connector are connected with the input end of the detection module through interlocking lines, the output end of the detection module is connected with the input end of the control module, and the output end of the detection module is connected with one end of the working module and one end of the low-voltage zero connector; the interlocking wire is arranged on the high-voltage side or the low-voltage side of the high-voltage part, so that the problem of high cost caused by complex wiring is solved; meanwhile, the state change of the interlocking line can be accurately detected through the interlocking detection circuit; and by utilizing a software reporting function of a control module in the interlocking detection circuit, a high-voltage control unit of the whole vehicle autonomously controls the power utilization of a high-voltage system, so that the safety of the whole vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of safety detection of new energy vehicles, and in particular to a vehicle interlock detection system and a control method thereof. Background Art

[0002] The High Voltage Inter-lock (HVIL) system of pure electric vehicles is an important safety design used to ensure the safe separation between the high voltage system and the low voltage system of electric vehicles.

[0003] A pair of low-voltage feedback lines are set at the high-voltage zero connectors corresponding to the high-voltage components in the traditional interlock detection system. The low-voltage feedback line enters the high-voltage component from the high-voltage zero connector, and is then output from the low-voltage zero connector to the high-voltage interlock detection unit of the vehicle through the interlock line.

[0004] However, in the loop of the existing interlock detection system, the feedback signals at the high-voltage zero connectors of all high-voltage components of the vehicle need to be connected in series with interlocking wires to form a loop. Since the high-voltage components are distributed throughout the vehicle, the interlocking wires are long, the wiring is complicated, and the cost of the low-voltage wiring harness is increased; and due to the complexity of the wiring and the increase in the length of the wiring harness, the accuracy of the interlocking wire status detection may be affected. Summary of the invention

[0005] The embodiments of the present application provide a vehicle interlock detection system and a control method thereof, aiming to solve the problems in the prior art of complex wiring of interlock wires resulting in high costs and inability to accurately detect changes in the state of the interlock wires.

[0006] In the first aspect, the embodiment of the present application provides a vehicle interlock detection system, including: a whole vehicle high-voltage control unit and a high-voltage component, the whole vehicle high-voltage control unit is connected to the high-voltage component; the high-voltage component is provided with a high-voltage zero connector, an interlock detection circuit and a low-voltage zero connector, the interlock detection circuit includes a detection module, a working module and a control module; one side of the high-voltage zero connector is connected to the high-voltage power supply through a power switch, the first interlock terminal and the second interlock terminal provided on the other side of the high-voltage zero connector are both connected to the input end of the detection module through an interlocking line, the output end of the detection module is connected to the input end of the control module, the output end of the control module is connected to the working module, and is also connected to one end of the low-voltage zero connector, and the other end of the low-voltage zero connector is connected to the whole vehicle high-voltage control unit; wherein the interlock line is provided on the high-voltage side or the low-voltage side of the high-voltage component; The detection module is used to receive an interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through an interlock line, and output an interlock signal to the control module according to the interlock terminal signal; The control module is used to receive the interlock signal and detect whether the interlock signal is a high-level signal; if the interlock signal is detected to be a high-level signal, the working module is controlled to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; or if the interlock signal is detected to be a low-level signal, the working module is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; The vehicle high-voltage control unit is used to receive the first control signal and control the power switch to be disconnected based on the first control signal; or to receive the second control signal and control the power switch to be closed based on the second control signal.

[0007] Furthermore, when the interlock line is set on the low-voltage side of the high-voltage component, the detection module includes a first protection unit, a second protection unit, a first switch unit, a detection branch and an isolation unit; the first end of the first protection unit is connected to the first interlocking terminal, the second end of the first protection unit is connected to the first external power supply, and the third end of the first protection unit is grounded; the first end of the second protection unit is connected to the second interlocking terminal, the second end of the second protection unit is grounded, and the third end of the second protection unit is connected to the first end of the first switch unit; the second end of the first switch unit is grounded, the third end of the first switch unit is respectively connected to the first external power supply, the first end of the detection branch, and the input end of the isolation unit, and the output end of the isolation unit is connected to the control module.

[0008] Furthermore, the first protection unit includes a first resistor and a first TVS diode, the first end of the first resistor is connected to the first external power supply, the second end of the first resistor is connected to the first interlocking terminal and also to the first end of the first TVS diode, and the second end of the first TVS diode is grounded.

[0009] Furthermore, the second protection unit includes a second TVS diode, a first voltage-stabilizing diode, a second resistor, a third resistor and a first capacitor, the first end of the second TVS diode is connected to the second interlocking terminal and also to the first end of the first voltage-stabilizing diode, the second end of the second TVS diode is grounded, the second end of the first voltage-stabilizing diode is connected to the first end of the second resistor, the second end of the second resistor is respectively connected to the first end of the third resistor, the first end of the first capacitor and the first end of the first switch unit, the second end of the third resistor is grounded, and the second end of the first capacitor is grounded.

[0010] Furthermore, the first switching unit includes a first NPN transistor, a second capacitor and a fourth resistor, the base of the first NPN transistor is connected to the second end of the second resistor, the emitter of the first NPN transistor is grounded, the collector of the first NPN transistor is connected to the first external power supply through the fourth resistor, the collector of the first NPN transistor is also respectively connected to the detection branch, the first end of the second capacitor and the input end of the isolation unit, and the second end of the second capacitor is grounded.

[0011] Furthermore, the isolation unit includes a fifth resistor, a third capacitor, an isolation chip, a sixth resistor and a fourth capacitor. The first end of the fifth resistor is connected to the collector of the first NPN transistor, and the second end of the fifth resistor is connected to the seventh pin of the isolation chip; the eighth pin of the isolation chip is connected to the first external power supply and also to the first end of the third capacitor, the second end of the third capacitor is connected to the fifth pin of the isolation chip, and the fifth pin is also grounded; the first end of the sixth resistor is connected to the second pin of the isolation chip, the second end of the sixth resistor is connected to the control module, the first pin of the isolation chip is connected to the second external power supply and also to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the fourth pin of the isolation chip, and the fourth pin is also grounded.

[0012] Furthermore, when the interlock line is arranged on the high voltage side of the high voltage component, the detection module includes a third protection unit, a fourth protection unit and a second switch unit; the first end of the third protection unit is connected to the first interlock terminal, the second end of the third protection unit is connected to the first external power supply, and the third end of the third protection unit is grounded; the first end of the fourth protection unit is connected to the second interlock terminal, the second end of the fourth protection unit is grounded, and the third end of the fourth protection unit is connected to the first end of the second switch unit; the second end of the second switch unit is grounded, the third end of the second switch unit is connected to the second external power supply, and the third end of the second switch unit is connected to the control module.

[0013] Furthermore, the second switch unit includes a second NPN transistor and a seventh resistor, the base of the second NPN transistor is connected to the third end of the fourth protection unit, the emitter of the second NPN transistor is grounded, the collector of the second NPN transistor is connected to the second external power supply through the fourth resistor, and the collector of the first NPN transistor is connected to the control module.

[0014] In a second aspect, an embodiment of the present application provides a control method for a vehicle interlock detection system, which is applied to the vehicle interlock detection system described in the first aspect, and the method includes: The detection module receives the interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through the interlock line, and outputs the interlock signal to the control module according to the interlock terminal signal; wherein the interlock line is arranged on the high voltage side or the low voltage side of the high voltage component; The control module receives the interlock signal and detects whether the interlock signal is a high level signal; If it is detected that the interlock signal is a high-level signal, the control module controls the working module on the high-voltage component to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit through a low-voltage zero connector; The vehicle high-voltage control unit receives the first control signal and controls the power switch to be disconnected based on the first control signal.

[0015] Furthermore, after the control module receives the interlock signal and detects whether the interlock signal is a high level signal, it also includes: If it is detected that the interlock signal is a low-level signal, the working module is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; The vehicle high-voltage control unit receives the second control signal and controls the power switch to close based on the second control signal.

[0016] The present invention provides a vehicle interlock detection system and a control method thereof, wherein a high-voltage zero connector, an interlock detection circuit and a low-voltage zero connector are arranged in a high-voltage component; one side of the high-voltage zero connector is connected to a high-voltage power supply through a power switch, and a first interlock terminal and a second interlock terminal arranged on the other side are both connected to an input end of a detection module through an interlock line, and an output end thereof is connected to an input end of a control module, and an output end thereof is connected to a working module and one end of a low-voltage zero connector, and the other end thereof is connected to a high-voltage control unit of a whole vehicle, wherein the problem of high cost caused by complex wiring is solved by arranging the interlock line on the high-voltage side or the low-voltage side of the high-voltage component; at the same time, the state change of the interlock line can be accurately detected by the interlock detection circuit; and the software reporting function of the control module in the interlock detection circuit is utilized to allow the high-voltage control unit of the whole vehicle to autonomously control the power consumption of the high-voltage system, thereby improving the safety of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic block diagram of the structure of a vehicle interlock detection system provided by an embodiment of the present invention; Figure 2 A first sub-circuit diagram of a detection module in a vehicle interlock detection system provided in an embodiment of the present invention; Figure 3 A second sub-circuit diagram of a detection module in a vehicle interlock detection system provided in an embodiment of the present invention; Figure 4 Another circuit diagram of a detection module in a vehicle interlock detection system provided by an embodiment of the present invention; Figure 5 A schematic flow chart of a control method for a vehicle interlock detection system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0021] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0022] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0023] See also Figure 1 , Figure 1 A schematic block diagram of the structure of a vehicle interlock detection system provided by an embodiment of the present invention; an embodiment of the present invention provides a vehicle interlock detection system 10, comprising: a vehicle high-voltage control unit 100 and a high-voltage component 200, wherein the vehicle high-voltage control unit 100 is connected to the high-voltage component 200; a high-voltage zero connector 210, an interlock detection circuit 220 and a low-voltage zero connector 230 are provided in the high-voltage component 200, wherein the interlock detection circuit 220 comprises a detection module 221, a working module 222 and a control module 223; one side of the high-voltage zero connector 210 is connected to the high-voltage zero connector 230 through a power switch 300. The first interlocking terminal and the second interlocking terminal provided on the other side of the high-voltage zero connector 210 are both connected to the input end of the detection module 221 through the interlocking wire 224, the output end of the detection module 221 is connected to the input end of the control module 223, the output end of the control module 223 is connected to the working module 222, and is also connected to one end of the low-voltage zero connector 230, and the other end of the low-voltage zero connector 230 is connected to the vehicle high-voltage control unit 100; wherein the interlocking wire 224 is provided on the high-voltage side or the low-voltage side of the high-voltage component 200; The detection module 221 is used to receive the interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through the interlock line 224, and output the interlock signal to the control module 223 according to the interlock terminal signal; The control module 223 is used to receive the interlock signal and detect whether the interlock signal is a high-level signal; if the interlock signal is detected to be a high-level signal, the working module 222 is controlled to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit 100 through the low-voltage zero connector 230; or if the interlock signal is detected to be a low-level signal, the working module 222 is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit 100 through the low-voltage zero connector 230; The vehicle high-voltage control unit 100 is used to receive the first control signal and control the power switch 300 to be opened based on the first control signal; or to receive the second control signal and control the power switch 300 to be closed based on the second control signal.

[0024] In this embodiment, the vehicle interlock detection system 10 is applied to an electric vehicle; wherein, the electric vehicle generally has a plurality of high-voltage components 200; in normal operation, each high-voltage component 200 requires a high-voltage power supply 400 to continuously provide a high-voltage power supply 400 to the plurality of high-voltage components 200, and the embodiment of the present invention is described by taking one of the high-voltage components 200 in the vehicle interlock detection system 10 as an example. In addition, the high-voltage component 200 may be a battery module, a compressor, a PTC heater, and other components.

[0025] Specifically, the vehicle interlock detection system 10 is composed of a vehicle high-voltage control unit 100 and a high-voltage component 200, wherein the vehicle high-voltage control unit 100 is connected to the high-voltage component 200; a high-voltage zero connector 210, an interlock detection circuit 220 and a low-voltage zero connector 230 are arranged inside each high-voltage component 200; and the interior of each high-voltage component 200 is divided into a high-voltage side and a low-voltage side; and the interlock detection circuit 220 includes a detection module 221, a working module 222 and a control module 223; wherein one side of the high-voltage zero connector 210 is connected to the high-voltage power supply 400 through a power switch 300, so that the high-voltage zero connector 210 is powered by the voltage power supply; at the same time, two terminals are arranged on the other side of the high-voltage zero connector 210, which are respectively An interlocking terminal and a second interlocking terminal, wherein the first interlocking terminal and the second interlocking terminal are both connected to the input end of the detection module 221 through an interlocking line 224, and the output end of the detection module 221 is connected to the input end of the control module 223; wherein the interlocking line 224 can be set at the high voltage side or the low voltage side of the high voltage component 200 according to its actual length; thereby receiving the interlocking terminal signal transmitted from the first interlocking terminal and the second interlocking terminal through the detection module 221, and outputting the interlocking signal to the control module 223 according to the interlocking terminal signal, and then receiving the interlocking signal by the control module 223, and detecting whether the interlocking signal is a high level signal, so as to determine whether the connection state between the interlocking line 224 and the first interlocking terminal and the second interlocking terminal is good.

[0026] Moreover, in this embodiment, the output end of the control module 223 is connected to the working module 222; specifically, when the control module 223 detects that the interlock signal is a high-level signal, the working module 222 is controlled to stop working based on the high-level signal; or when the detection module 221 detects that the interlock signal is a low-level signal, the working module 222 is controlled to work normally based on the low-level signal. In addition, the output end of the control module 223 is also connected to one end of the low-voltage zero connector 230, and the other end of the low-voltage zero connector 230 is connected to the vehicle high-voltage control unit 100 through a signal line; wherein, the signal line in this embodiment can be a LIN or CAN line; specifically, when the control module 223 detects that the interlock signal is a high-level signal, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit 100 through the low-voltage zero connector 230, so that after receiving the first control signal, the vehicle high-voltage control unit 100 controls the vehicle high-voltage control unit 100 based on the signal line. The first control signal controls the power switch 300 to be disconnected to cut off the high-voltage power supply 400 on the vehicle, that is, to stop the high-voltage power supply 400 from supplying power to the high-voltage component 200; when the control module 223 detects that the interlock signal is a low-level signal, it generates a second control signal based on the low-level signal, and sends the second control signal to the vehicle high-voltage control unit 100 through the low-voltage zero connector 230, so that after receiving the second control signal, the vehicle high-voltage control unit 100 controls the power switch 300 to be closed based on the second control signal, so that the high-voltage power supply 400 supplies power to the high-voltage component 200.

[0027] The above-mentioned embodiment solves the problem of high cost caused by complex wiring of the interlocking line. At the same time, the state change of the interlocking line 224 can be accurately detected through the interlocking detection circuit 220. The software reporting function of the control module 223 in the interlocking detection circuit 220 is utilized to allow the high-voltage control unit 100 of the whole vehicle to autonomously control the power consumption of the high-voltage system, thereby improving the safety of the whole vehicle.

[0028] In one embodiment, if Figure 1-3As shown, when the interlock line 224 is arranged on the low-voltage side of the high-voltage component 200, the detection module 221 includes a first protection unit 2211, a second protection unit 2212, a first switch unit 2213, a detection branch 2214 and an isolation unit 2215; the first end of the first protection unit 2211 is connected to the first interlock terminal, the second end of the first protection unit 2211 is connected to the first external power supply, and the third end of the first protection unit 2211 is grounded; the first end of the second protection unit 2212 is connected to the second interlock terminal, the second end of the second protection unit 2212 is grounded, and the third end of the second protection unit 2212 is connected to the first end of the first switch unit 2213; the second end of the first switch unit 2213 is grounded, and the third end of the first switch unit 2213 is respectively connected to the first external power supply, the first end of the detection branch 2214, and the input end of the isolation unit 2215, and the output end of the isolation unit 2215 is connected to the control module 223.

[0029] In this embodiment, since each high-voltage component 200 is divided into a low-voltage side or a high-voltage side, when the interlock line 224 is set on the low-voltage side of the high-voltage component 200, the detection module 221 in the interlock detection circuit 220 specifically includes a first protection unit 2211, a second protection unit 2212, a first switch unit 2213, a detection branch 2214 and an isolation unit 2215; wherein, the first end of the first protection unit 2211 is connected to the first interlock terminal, the second end of the first protection unit 2211 is connected to the first external power supply, and the third end of the first protection unit 2211 is grounded, so that the first external power supply provides the interlock detection circuit 220 with a working voltage; wherein, the first external power supply is 5V in this embodiment; and, the first protection unit 2211 plays a role in protecting each device in the interlock detection circuit 220. The first end of the second protection unit 2212 is connected to the second interlocking terminal, the second end of the second protection unit 2212 is grounded, and the third end of the second protection unit 2212 is connected to the first end of the first switch unit 2213; wherein, the second protection unit 2212 has similar functions to the first protection unit 2211, and will not be described in detail here. The second end of the first switch unit 2213 is grounded, and the third end of the first switch unit 2213 is respectively connected to the first external power supply, the first end of the detection branch 2214, and the input end of the isolation unit 2215, and the output end of the isolation unit 2215 is connected to the control module 223, so that the first switch unit 2213 is turned on or off after receiving the interlocking terminal signal, thereby determining whether to divide the first external power supply through the first switch unit 2213, so as to output the interlocking signal of the high and low level signals to the isolation unit 2215, and the isolation unit 2215 electrically isolates the interlocking signal to protect the low-voltage side circuit. In addition, in case that the control module 223 cannot detect the interlock signal, a detection branch 2214 is provided before the input end of the isolation unit 2215 to facilitate relevant staff to obtain and detect the status of the current interlock signal.

[0030] In one embodiment, if Figure 1-3 As shown, the first protection unit 2211 includes a first resistor R1 and a first TVS diode D1, the first end of the first resistor R1 is connected to the first external power supply, the second end of the first resistor R1 is connected to the first interlocking terminal and also to the first end of the first TVS diode D1, and the second end of the first TVS diode D1 is grounded.

[0031] In this embodiment, the first protection unit 2211 specifically includes a first resistor R1 and a first TVS diode D1, wherein the first end of the first resistor R1 is connected to the first external power source, and the second end of the first resistor R1 is connected to the first interlock terminal; specifically, when the first external power source provides voltage to the interlock detection circuit 220, the first resistor R1 limits the current through the first interlock terminal to prevent it from damaging other components in the circuit due to excessive current; in addition, the second end of the first resistor R1 is also connected to the first end of the first TVS diode D1, and the second end of the first TVS diode D1 is grounded; wherein the first TVS diode D1 is a component specifically used to protect the circuit from transient overvoltage (such as lightning, electrostatic discharge, etc.). When a transient overvoltage occurs in the interlock detection circuit 220, the first TVS diode D1 will quickly turn on and discharge the excess voltage to the ground, thereby effectively preventing circuit damage or failure caused by overvoltage.

[0032] In one embodiment, if Figure 1-3 As shown, the second protection unit 2212 includes a second TVS diode D2, a first zener diode ZD1, a second resistor R2, a third resistor R3 and a first capacitor C1, the first end of the second TVS diode D2 is connected to the second interlocking terminal, and is also connected to the first end of the first zener diode ZD1, the second end of the second TVS diode D2 is grounded, the second end of the first zener diode ZD1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is respectively connected to the first end of the third resistor R3, the first end of the first capacitor C1 and the first end of the first switch unit 2213, the second end of the third resistor R3 is grounded, and the second end of the first capacitor C1 is grounded.

[0033] In this embodiment, the second protection unit 2212 specifically includes a second TVS diode D2, a first voltage stabilizing diode ZD1, a second resistor R2, a third resistor R3 and a first capacitor C1; wherein, the first end of the second TVS diode D2 is connected to the second interlocking terminal and the first end of the first voltage stabilizing diode ZD1 respectively, and the second end of the second TVS diode D2 is grounded; the role of the second TVS diode D2 in this embodiment is similar to that of the first TVS diode D1, both of which are to effectively suppress transient overvoltage. In addition, the second end of the first voltage stabilizing diode ZD1 is connected to the first end of the second resistor R2, and the first voltage stabilizing diode ZD1 plays a role in stabilizing voltage. In addition, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the first end of the first capacitor C1 and the first end of the first switch unit 2213 respectively, the second end of the third resistor R3 is grounded, and the second end of the first capacitor C1 is grounded; by connecting the second resistor R2 in series on the first end of the first switch unit 2213, the current is limited to prevent the first switch unit 2213 from being damaged by excessive current. Moreover, by connecting the third resistor R3 in parallel between the first end and the second end of the first switch unit 2213, the third resistor R3 can stabilize and adjust the voltage and current of the first end of the first switch unit 2213; in addition, the first capacitor C1 is also connected in parallel between the first end and the second end of the first switch unit 2213, so that the first capacitor C1 can play a filtering role and improve the anti-interference ability.

[0034] In one embodiment, if Figure 1-3 As shown, the first switch unit 2213 includes a first NPN transistor Q1, a second capacitor C2 and a fourth resistor R4, the base of the first NPN transistor Q1 is connected to the second end of the second resistor R2, the emitter of the first NPN transistor Q1 is grounded, the collector of the first NPN transistor Q1 is connected to the first external power supply through the fourth resistor R4, the collector of the first NPN transistor Q1 is also respectively connected to the detection branch 2214, the first end of the second capacitor C2 and the input end of the isolation unit 2215, and the second end of the second capacitor C2 is grounded.

[0035] In this embodiment, the first switch unit 2213 includes a first NPN transistor Q1, a second capacitor C2 and a fourth resistor R4, wherein the base of the first NPN transistor Q1 is connected to the second end of the second resistor R2, the emitter of the first NPN transistor Q1 is grounded, and the collector of the first NPN transistor Q1 is connected to the first external power supply through the fourth resistor R4; specifically, when the high-voltage zero connector 210 is in good contact with the first interlocking terminal and the second interlocking terminal, a short circuit is formed. At this time, the first NPN transistor Q1 is connected to the first external power supply through the first NPN transistor Q1. The base voltage of transistor Q1 is high enough to turn on the first NPN transistor Q1, allowing the first external power supply to flow from the collector to the emitter, thereby realizing voltage division of the first external power supply, so that the interlock signal changes from a high-level signal to a low-level signal; when the high-voltage zero connector 210 is in poor contact with the first interlock terminal and the second interlock terminal, a circuit is formed, and at this time, when the base voltage passing through the first NPN transistor Q1 is low, the first NPN transistor Q1 is cut off to prevent current from flowing, and the output interlock signal at this time remains a high-level signal. In addition, a second capacitor C2 is connected between the emitter and the collector of the first NPN transistor Q1 to reduce signal interference. In addition, in order to protect the first NPN transistor Q1 from the impact of excessive current, a fourth resistor R4 is set between the first external power supply and the collector of the first NPN transistor Q1 to limit the collector current passing through the first NPN transistor Q1.

[0036] In one embodiment, if Figure 1-3 As shown, the isolation unit 2215 includes a fifth resistor R5, a third capacitor C3, an isolation chip U12, a sixth resistor R6 and a fourth capacitor C4, the first end of the fifth resistor R5 is connected to the collector of the first NPN transistor Q1, and the second end of the fifth resistor R5 is connected to the seventh pin of the isolation chip U12; the eighth pin of the isolation chip U12 is connected to the first external power supply, and is also connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is connected to the fifth pin of the isolation chip U12, and the fifth pin is also grounded; the first end of the sixth resistor R6 is connected to the second pin of the isolation chip U12, the second end of the sixth resistor R6 is connected to the control module 223, the first pin of the isolation chip U12 is connected to the second external power supply, and is also connected to the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected to the fourth pin of the isolation chip U12, and the fourth pin is also grounded.

[0037] In this embodiment, the isolation unit 2215 includes a fifth resistor R5, a third capacitor C3, an isolation chip U12, a sixth resistor R6 and a fourth capacitor C4, wherein the fifth resistor R5 is connected between the collector of the first NPN transistor Q1 and the seventh pin of the isolation chip U12 to limit the current and protect the isolation chip U12 from damage caused by excessive current; wherein the seventh pin of the isolation chip U12 is an input pin. And the third capacitor C3 is connected between the eighth pin and the fifth pin of the isolation chip U12 to reduce the voltage fluctuation on the power line and ensure that the isolation chip U12 obtains a stable power supply voltage; wherein the eighth pin is a power pin with a 5V voltage input; and the fifth pin is a ground pin. In addition, the isolation chip U12, as the core of the isolation unit 2215, can electrically isolate the input and output parts in the isolation unit 2215; wherein the isolation chip U12 can be a magnetic coupling isolation chip U12, a capacitive coupling isolation chip U12, etc. And the sixth resistor R6 is connected between the second pin of the isolation chip U12 and the control module 223 to limit the output current; wherein the second pin is the output pin; the fourth capacitor C4 is connected between the first pin and the fourth pin of the isolation chip U12; wherein the first pin is the power pin, connected to the second external power supply, and the second external power supply is 3.3V; and the function of the fourth capacitor C4 is similar to that of the third capacitor C3, both of which are to ensure that the isolation chip U12 obtains a stable power supply voltage.

[0038] In one embodiment, if Figure 1-4 As shown, when the interlocking line 224 is arranged on the high voltage side of the high voltage component 200, the detection module 221 includes a third protection unit (not shown), a fourth protection unit 2216 and a second switch unit 2217; the first end of the third protection unit is connected to the first interlocking terminal, the second end of the third protection unit is connected to the first external power supply, and the third end of the third protection unit is grounded; the first end of the fourth protection unit 2216 is connected to the second interlocking terminal, the second end of the fourth protection unit 2216 is grounded, and the third end of the fourth protection unit 2216 is connected to the first end of the second switch unit 2217; the second end of the second switch unit 2217 is grounded, the third end of the second switch unit 2217 is connected to the second external power supply, and the third end of the second switch unit 2217 is connected to the control module 223.

[0039] In this embodiment, since each high-voltage component 200 is internally divided into a low-voltage side or a high-voltage side, when the interlock line 224 is set on the high-voltage side of the high-voltage component 200, the detection module 221 in the interlock detection circuit 220 includes a third protection unit, a fourth protection unit 2216 and a second switch unit 2217; wherein the first end of the third protection unit is connected to the first interlock terminal, the second end of the third protection unit is connected to the first external power supply, so as to provide a working voltage for the interlock detection circuit 220, and the third end of the third protection unit is grounded, so as to protect each device in the interlock detection circuit 220 through the third protection unit; and the first end of the fourth protection unit 2216 is connected to the second interlock terminal, the second end of the fourth protection unit 2216 is grounded, and the fourth protection unit 2 The third end of 216 is connected to the first end of the second switch unit 2217 to send the interlock terminal signal to the second switch unit 2217; the fourth protection unit 2216 has similar functions to the third protection unit and will not be described in detail here; the second end of the second switch unit 2217 is grounded, the third end of the second switch unit 2217 is connected to the second external power supply, and the third end of the second switch unit 2217 is connected to the control module 223, so that the second switch unit 2217 is turned on or off after receiving the interlock terminal signal, thereby determining whether to divide the voltage of the first external power supply through the second switch unit 2217, so as to output an interlock signal of high and low level signals to the control module 223, so that the control module 223 can detect whether the interlock signal is high level.

[0040] In addition, the third protection unit in this embodiment specifically includes an eighth resistor R8 and a third TVS diode D3, the first end of the eighth resistor R8 is connected to the first external power supply, the second end of the eighth resistor R8 is connected to the first interlocking terminal, and is also connected to the first end of the third TVS diode D3, and the second end of the third TVS diode D3 is grounded.

[0041] The fourth protection unit 2216 includes a fourth TVS diode D4, a second voltage-stabilizing diode ZD2, a ninth resistor R9, a tenth resistor R10 and a fifth capacitor C5. The first end of the fourth TVS diode D4 is connected to the second interlocking terminal and is also connected to the first end of the second voltage-stabilizing diode ZD2. The second end of the fourth TVS diode D4 is grounded. The second end of the second voltage-stabilizing diode ZD2 is connected to the first end of the ninth resistor R9. The second end of the ninth resistor R9 is respectively connected to the first end of the tenth resistor R10, the first end of the fifth capacitor C5 and the first end of the second switch unit 2217. The second end of the tenth resistor R10 is grounded. The second end of the fifth capacitor C5 is grounded.

[0042] In one embodiment, if Figure 1-4 As shown, the second switch unit 2217 includes a second NPN transistor Q2 and a seventh resistor R7, the base of the second NPN transistor Q2 is connected to the third end of the fourth protection unit 2216, the emitter of the second NPN transistor Q2 is grounded, the collector of the second NPN transistor Q2 is connected to the second external power supply through the fourth resistor R4, and the collector of the first NPN transistor Q1 is connected to the control module 223.

[0043] In this embodiment, the second switch unit 2217 includes a second NPN-type transistor Q2 and a seventh resistor R7, wherein the base of the second NPN-type transistor Q2 is connected to the third end of the fourth protection unit 2216, the emitter of the second NPN-type transistor Q2 is grounded, and the collector of the second NPN-type transistor Q2 is connected to the second external power supply through the fourth resistor R4; specifically, when the base voltage of the second NPN-type transistor Q2 is high enough, the second NPN-type transistor Q2 is turned on, allowing the first external power supply to flow from the collector to the emitter, thereby achieving voltage division of the output interlock signal, so that it changes from a high-level signal to a low-level signal; when the base voltage of the second NPN-type transistor Q2 is low, the second NPN-type transistor Q2 is cut off to prevent current from flowing, and the output interlock signal remains a high-level signal. In addition, in order to protect the second NPN transistor Q2 from the impact of excessive current, a fourth resistor R4 is provided between the first external power supply and the collector of the second NPN transistor Q2 to limit the collector current passing through the second NPN transistor Q2.

[0044] See also Figure 1-5The embodiment of the present invention further provides a control method for a vehicle interlock detection system, and the control method for a vehicle interlock detection system is applied to the vehicle interlock detection system 10. The vehicle interlock detection system includes: a vehicle high-voltage control unit 100 and a high-voltage component 200, wherein the vehicle high-voltage control unit 100 is connected to the high-voltage component 200; the high-voltage component 200 is provided with a high-voltage zero connector 210, an interlock detection circuit 220 and a low-voltage zero connector 230, wherein the interlock detection circuit 220 includes a detection module 221, a working module 222 and a control module 223; one side of the high-voltage zero connector 210 is connected to a high-voltage power supply 400 through a power switch 300, and a first interlock terminal and a second interlock terminal provided on the other side of the high-voltage zero connector 210 are both connected to an input end of the detection module 221 through an interlock line 224, an output end of the detection module 221 is connected to an input end of the control module 223, an output end of the control module 223 is connected to the working module 222, and is also connected to one end of the low-voltage zero connector 230, and the other end of the low-voltage zero connector 230 is connected to the vehicle high-voltage control unit 100.

[0045] like Figure 5 As shown, the control method of the vehicle interlock detection system includes the following steps S110-S140.

[0046] S110, the detection module receives the interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through the interlock line, and outputs the interlock signal to the control module according to the interlock terminal signal; wherein the interlock line is arranged on the high voltage side or the low voltage side of the high voltage component; S120, the control module receives the interlock signal, and detects whether the interlock signal is a high level signal; S130, if it is detected that the interlock signal is a high-level signal, the control module controls the working module on the high-voltage component to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit through a low-voltage zero connector; S140. The vehicle high-voltage control unit receives the first control signal, and controls the power switch to be disconnected based on the first control signal.

[0047] In this embodiment, the detection module receives the interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through the interlock line, and outputs the interlock signal to the control module according to the interlock terminal signal, and then the control module receives the interlock signal and detects whether the interlock signal is a high-level signal to determine whether the connection state between the interlock line and the first interlock terminal and the second interlock terminal is good. In addition, in this embodiment, the output end of the control module is connected to the working module; specifically, when the control module detects that the interlock signal is a high-level signal, the working module is controlled to stop working based on the high-level signal; or when the detection module detects that the interlock signal is a low-level signal, the working module is controlled to work normally based on the low-level signal. In addition, the output end of the control module is also connected to one end of the low-voltage zero connector, and the other end of the low-voltage zero connector is connected to the vehicle high-voltage control unit through a signal line; wherein the signal line may be a LIN or CAN line; specifically, when the control module detects that the interlock signal is a high-level signal, it generates a first control signal based on the high-level signal, and sends the first control signal to the vehicle high-voltage control unit through the low-voltage zero connector, so that after receiving the first control signal, the vehicle high-voltage control unit controls the power switch to be disconnected based on the first control signal to cut off the vehicle high-voltage power supply, that is, to stop the high-voltage power supply to the high-voltage components; when the control module detects that the interlock signal is a low-level signal, it generates a second control signal based on the low-level signal, and sends the second control signal to the vehicle high-voltage control unit through the low-voltage zero connector, so that after receiving the second control signal, the vehicle high-voltage control unit controls the power switch to be closed based on the second control signal, so that the high-voltage power supply can supply power to the high-voltage components.

[0048] Therefore, the above-mentioned embodiment solves the problem of high cost caused by complex wiring by setting the interlocking line on the high-voltage side or low-voltage side of the high-voltage component; at the same time, the state change of the interlocking line can be accurately detected through the interlocking detection circuit; and the software reporting function of the control module in the interlocking detection circuit is utilized to allow the high-voltage control unit of the whole vehicle to autonomously control the power consumption of the high-voltage system, thereby improving the safety of the whole vehicle.

[0049] In one embodiment, after S120, the method further includes: If it is detected that the interlock signal is a low-level signal, the working module is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; The vehicle high-voltage control unit receives the second control signal, and controls the power switch to close based on the second control signal.

[0050] In this embodiment, after the control module detects whether the interlock signal is a high-level signal, when the control module detects that the interlock signal is a low-level signal, the working module is controlled to work normally based on the low-level signal. At the same time, the control module generates a second control signal based on the low-level signal, and sends the second control signal to the vehicle high-voltage control unit through the low-voltage zero connector, so that after receiving the second control signal, the vehicle high-voltage control unit controls the power switch to close based on the second control signal, so that the high-voltage power supply supplies power to the high-voltage components, thereby improving the power safety of the vehicle.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A vehicle interlock detection system, characterized in that: include: A vehicle high-voltage control unit and high-voltage components, wherein the vehicle high-voltage control unit is connected to the high-voltage components; The high-voltage component is provided with a high-voltage zero connector, an interlock detection circuit and a low-voltage zero connector, and the interlock detection circuit includes a detection module, a working module and a control module; one side of the high-voltage zero connector is connected to the high-voltage power supply through a power switch, and the first interlock terminal and the second interlock terminal provided on the other side of the high-voltage zero connector are both connected to the input end of the detection module through an interlock line, the output end of the detection module is connected to the input end of the control module, the output end of the control module is connected to the working module, and is also connected to one end of the low-voltage zero connector, and the other end of the low-voltage zero connector is connected to the high-voltage control unit of the whole vehicle; wherein the interlock line is provided on the high-voltage side or the low-voltage side of the high-voltage component; The detection module is used to receive an interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through an interlock line, and output an interlock signal to the control module according to the interlock terminal signal; The control module is used to receive the interlock signal and detect whether the interlock signal is a high-level signal; if the interlock signal is detected to be a high-level signal, the working module is controlled to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; or if the interlock signal is detected to be a low-level signal, the working module is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; The vehicle high-voltage control unit is used to receive the first control signal and control the power switch to be disconnected based on the first control signal; Or used to receive the second control signal and control the power switch to close based on the second control signal.

2. The vehicle interlock detection system according to claim 1, characterized in that: When the interlock line is arranged on the low-voltage side of the high-voltage component, the detection module includes a first protection unit, a second protection unit, a first switch unit, a detection branch and an isolation unit; the first end of the first protection unit is connected to the first interlock terminal, the second end of the first protection unit is connected to the first external power supply, and the third end of the first protection unit is grounded; the first end of the second protection unit is connected to the second interlock terminal, the second end of the second protection unit is grounded, and the third end of the second protection unit is connected to the first end of the first switch unit; the second end of the first switch unit is grounded, the third end of the first switch unit is respectively connected to the first external power supply, the first end of the detection branch, and the input end of the isolation unit, and the output end of the isolation unit is connected to the control module.

3. The vehicle interlock detection system according to claim 2, characterized in that: The first protection unit includes a first resistor and a first TVS diode, the first end of the first resistor is connected to the first external power supply, the second end of the first resistor is connected to the first interlocking terminal and also to the first end of the first TVS diode, and the second end of the first TVS diode is grounded.

4. The vehicle interlock detection system according to claim 2, characterized in that: The second protection unit includes a second TVS diode, a first voltage-stabilizing diode, a second resistor, a third resistor and a first capacitor. The first end of the second TVS diode is connected to the second interlocking terminal and is also connected to the first end of the first voltage-stabilizing diode. The second end of the second TVS diode is grounded. The second end of the first voltage-stabilizing diode is connected to the first end of the second resistor. The second end of the second resistor is respectively connected to the first end of the third resistor, the first end of the first capacitor and the first end of the first switch unit. The second end of the third resistor is grounded. The second end of the first capacitor is grounded.

5. The vehicle interlock detection system according to claim 4, characterized in that: The first switch unit includes a first NPN transistor, a second capacitor and a fourth resistor, the base of the first NPN transistor is connected to the second end of the second resistor, the emitter of the first NPN transistor is grounded, the collector of the first NPN transistor is connected to the first external power supply through the fourth resistor, the collector of the first NPN transistor is also respectively connected to the detection branch, the first end of the second capacitor and the input end of the isolation unit, and the second end of the second capacitor is grounded.

6. The vehicle interlock detection system according to claim 5, characterized in that: The isolation unit includes a fifth resistor, a third capacitor, an isolation chip, a sixth resistor and a fourth capacitor. The first end of the fifth resistor is connected to the collector of the first NPN transistor, and the second end of the fifth resistor is connected to the seventh pin of the isolation chip; the eighth pin of the isolation chip is connected to the first external power supply and also to the first end of the third capacitor, the second end of the third capacitor is connected to the fifth pin of the isolation chip, and the fifth pin is also grounded; the first end of the sixth resistor is connected to the second pin of the isolation chip, the second end of the sixth resistor is connected to the control module, the first pin of the isolation chip is connected to the second external power supply and also to the first end of the fourth capacitor, the second end of the fourth capacitor is connected to the fourth pin of the isolation chip, and the fourth pin is also grounded.

7. The vehicle interlock detection system according to claim 6, characterized in that: When the interlock line is arranged on the high voltage side of the high voltage component, the detection module includes a third protection unit, a fourth protection unit and a second switch unit; a first end of the third protection unit is connected to the first interlock terminal, a second end of the third protection unit is connected to the first external power supply, and a third end of the third protection unit is grounded; a first end of the fourth protection unit is connected to the second interlock terminal, a second end of the fourth protection unit is grounded, and a third end of the fourth protection unit is connected to the first end of the second switch unit; a second end of the second switch unit is grounded, a third end of the second switch unit is connected to the second external power supply, and a third end of the second switch unit is connected to the control module.

8. The vehicle interlock detection system according to claim 7, characterized in that: The second switch unit includes a second NPN transistor and a seventh resistor, the base of the second NPN transistor is connected to the third end of the fourth protection unit, the emitter of the second NPN transistor is grounded, the collector of the second NPN transistor is connected to the second external power supply through the fourth resistor, and the collector of the first NPN transistor is connected to the control module.

9. A control method for a vehicle interlock detection system, applied to the vehicle interlock detection system according to any one of claims 1 to 8, characterized in that: The method comprises: The detection module receives the interlock terminal signal transmitted from the first interlock terminal and the second interlock terminal through the interlock line, and outputs the interlock signal to the control module according to the interlock terminal signal; wherein the interlock line is arranged on the high voltage side or the low voltage side of the high voltage component; The control module receives the interlock signal and detects whether the interlock signal is a high level signal; If it is detected that the interlock signal is a high-level signal, the control module controls the working module on the high-voltage component to stop working based on the high-level signal; at the same time, a first control signal is generated based on the high-level signal, and the first control signal is sent to the vehicle high-voltage control unit through a low-voltage zero connector; The vehicle high-voltage control unit receives the first control signal and controls the power switch to be disconnected based on the first control signal.

10. The control method of the vehicle interlock detection system according to claim 9, characterized in that: After the control module receives the interlock signal and detects whether the interlock signal is a high level signal, it also includes: If it is detected that the interlock signal is a low-level signal, the working module is controlled to work normally based on the low-level signal; at the same time, a second control signal is generated based on the low-level signal, and the second control signal is sent to the vehicle high-voltage control unit through the low-voltage zero connector; The vehicle high-voltage control unit receives the second control signal, and controls the power switch to close based on the second control signal.

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