Vehicle lamp control device and vehicle lamp control method

Abstract

The application discloses a vehicle lamp control device and a vehicle lamp control method. The vehicle lamp control device comprises a driving chip, a switch logic circuit and a microcontroller. The driving chip is adapted to light up a vehicle lamp according to a received light-up control signal. The switch logic circuit is connected with the driving chip. The microcontroller is connected with the driving chip and is used for communicating with the driving chip. Before the microcontroller is woken up from a sleep state, the switch logic circuit is in a conduction state to allow the light-up control signal from a vehicle main controller to be transmitted to the driving chip. When the driving chip receives the light-up control signal from the vehicle main controller, the driving chip immediately supplies power to the vehicle lamp to light up the vehicle lamp. In the application, the driving chip can timely respond to the light-up control signal from the vehicle main controller before the microcontroller is woken up, so that the light-up delay of the vehicle lamp is avoided, and the safety performance of the vehicle is improved.

Description

Technical Field

[0001] This invention relates to a common vehicle headlight control scheme, which is a scheme to control the headlights to illuminate in time before the microcontroller of the headlight control unit is woken up. It belongs to an improved scheme of vehicle headlight electronic control. Background Technology

[0002] In current vehicle lighting control technology, if the vehicle is in a sleep state, the lighting control unit is also in a low-power sleep state (tens of µA current), meaning that the main power components of the lighting control unit are powered down. In this situation, if the vehicle's main controller sends a lighting control command, the lighting control unit cannot immediately respond and turn on the lights. Instead, it must first wait for components such as the microcontroller (MCU) to wake up to normal operating conditions before recognizing and judging the control command and then executing the corresponding lighting action. However, the long delay between the control unit waking up and the lights turning on results in delayed lighting, failing to meet functional safety requirements and failing to promptly alert the driver and pedestrians, posing a significant safety hazard.

[0003] Furthermore, when the microcontroller in the headlight controller fails, the headlight control unit cannot receive commands from the upper controller and therefore cannot perform the lighting action, which poses a more serious safety hazard. Summary of the Invention

[0004] The purpose of this invention is to solve at least one aspect of the aforementioned problems and defects existing in the prior art.

[0005] According to one aspect of the present invention, a vehicle lighting control device is provided. The vehicle lighting control device includes: a driver chip adapted to illuminate a vehicle light according to a received lighting control signal; a switching logic circuit connected to the driver chip; and a microcontroller connected to the driver chip for communicating with the driver chip. Before the microcontroller is woken from a sleep state, the switching logic circuit is in an on state to allow a lighting control signal from a vehicle main controller to be transmitted to the driver chip; when the driver chip receives the lighting control signal from the vehicle main controller, the driver chip immediately supplies power to the vehicle light to illuminate the vehicle light.

[0006] According to an exemplary embodiment of the present invention, the switching logic circuit is connected to the port of the driver chip, the microcontroller is connected to the CAN2 port of the driver chip, and the microcontroller is connected to the control terminal of the switching logic circuit for controlling the state of the switching logic circuit; after the microcontroller is woken up to the normal working state, the microcontroller sends a lighting control signal to the CAN2 port of the driver chip and controls the switching logic circuit to the off state, so as to prevent the lighting control signal from the vehicle main controller from being sent to the port of the driver chip.

[0007] According to another exemplary embodiment of the present invention, the microcontroller has a port connected to the control terminal of the switching logic circuit; when the microcontroller is in the sleep state or in the process of being woken up, the port of the microcontroller outputs a low level to control the switching logic circuit to be in the on state; when the microcontroller is in the normal operating state, the port of the microcontroller outputs a high level to control the switching logic circuit to be in the off state.

[0008] According to another exemplary embodiment of the present invention, the switching logic circuit includes an electronic switch S1, and the port of the microcontroller is used to control the on and off of the electronic switch S1; when the electronic switch S1 is off, the switching logic circuit is in the on state to allow the lighting control signal from the vehicle main controller to be sent to the port of the driver chip; when the electronic switch S1 is on, the switching logic circuit is in the off state to prevent the lighting control signal from the vehicle main controller from being sent to the port of the driver chip.

[0009] According to another exemplary embodiment of the present invention, when the electronic switch S1 is turned on, the port of the driver chip is grounded via the switch logic circuit to stop receiving the lighting control signal from the vehicle main controller.

[0010] According to another exemplary embodiment of the present invention, the vehicle lighting control device further includes a CAN transceiver connected between port CAN1 of the microcontroller and port CAN2 of the driver chip for transmitting communication data between the two.

[0011] According to another exemplary embodiment of the present invention, the vehicle lighting control device further includes: a vehicle lighting protection circuit having a port for receiving a lighting control signal from a vehicle main controller and a port for outputting the received lighting control signal, wherein the port of the vehicle lighting protection circuit is connected to the input terminal of the switching logic circuit and the port of the microcontroller, for transmitting the received lighting control signal to the input terminal of the switching logic circuit and the port of the microcontroller respectively.

[0012] According to another exemplary embodiment of the present invention, when the port of the headlight protection circuit receives a lighting control signal from the vehicle main controller, the port of the headlight protection circuit outputs a high level, so that the port of the driver chip and the port of the microcontroller are at a high level, thereby activating the driver chip and waking up the microcontroller.

[0013] According to another aspect of the present invention, a vehicle lighting control method is also provided, comprising the following steps:

[0014] When a lighting control signal is received from the vehicle's main controller and the microcontroller has not yet been woken up, the switch logic circuit is in the on state, so that the lighting control signal from the vehicle's main controller is sent to the port of the driver chip to light up the vehicle lights before the microcontroller is woken up.

[0015] According to an exemplary embodiment of the present invention, the vehicle light control method further includes the step of:

[0016] When the microcontroller has been woken up to normal operating state, the microcontroller sends a lighting control signal to the CAN2 port of the driver chip and controls the switch logic circuit to the off state, so as to prevent the lighting control signal from the vehicle main controller from being sent to the port of the driver chip.

[0017] In the aforementioned exemplary embodiments of the present invention, the driver chip can respond to the lighting control signal from the vehicle main controller in a timely manner before the microcontroller is woken up, avoiding headlight illumination delay and improving vehicle safety performance.

[0018] Other objects and advantages of the invention will become apparent from the following description of the invention with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the invention. Attached Figure Description

[0019] Figure 1 A circuit diagram of a vehicle lighting control device according to an exemplary embodiment of the present invention is shown;

[0020] Figure 2 This diagram shows a circuit schematic of a vehicle headlight control device according to an exemplary embodiment of the present invention, wherein the microcontroller is not yet awakened and the switching logic circuit is in the on state;

[0021] Figure 3 This diagram shows a circuit schematic of a vehicle headlight control device according to an exemplary embodiment of the present invention, wherein the microcontroller has been activated and the switching logic circuit is controlled by the microcontroller to the off state. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0023] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0024] According to a general technical concept of the present invention, a vehicle lighting control device is provided. The vehicle lighting control device includes: a driver chip adapted to illuminate a vehicle light according to a received lighting control signal; a switching logic circuit connected to the driver chip; and a microcontroller connected to the driver chip for communicating with the driver chip. Before the microcontroller is woken from a sleep state, the switching logic circuit is in an on state to allow a lighting control signal from a vehicle main controller to be transmitted to the driver chip; when the driver chip receives the lighting control signal from the vehicle main controller, the driver chip immediately supplies power to the vehicle light to illuminate the vehicle light.

[0025] According to another general technical concept of the present invention, a vehicle lighting control method is provided, comprising: providing the aforementioned vehicle lighting control device; and when a lighting control signal is received from a vehicle main controller and the microcontroller has not yet been woken up, the switching logic circuit is in a conducting state, such that the lighting control signal from the vehicle main controller is transmitted to the port of the driver chip to illuminate the vehicle lighting before the microcontroller is woken up.

[0026] Figure 1 This diagram shows a circuit schematic of a vehicle lighting control device according to an exemplary embodiment of the present invention.

[0027] like Figure 1 As shown, in an exemplary embodiment of the present invention, a vehicle lighting control device is disclosed. The vehicle lighting control device includes: a switching logic circuit 2, a microcontroller 3, and a driver chip 5. The driver chip 5 is adapted to illuminate the vehicle lights 6 according to a received lighting control signal. The switching logic circuit 2 is connected to port 5a of the driver chip 5. The microcontroller 3 is connected to port CAN2 of the driver chip 5 for communication with the driver chip 5.

[0028] Figure 2This diagram shows a circuit schematic of a vehicle headlight control device according to an exemplary embodiment of the present invention, wherein the microcontroller 3 is not yet awakened and the switching logic circuit 2 is in the on state.

[0029] like Figure 2 As shown in the illustrated embodiment, the switching logic circuit 2 is in the ON state before the microcontroller 3 is woken up from the sleep state. (See Figure 1) Figure 2 This allows the lighting control signal from the vehicle's main controller to be sent to port 5a of the driver chip 5. When port 5a of the driver chip 5 receives the lighting control signal, the driver chip 5 immediately supplies power to the headlight 6 to illuminate it. This avoids headlight illumination delay and improves vehicle safety.

[0030] Figure 3 This diagram shows a circuit schematic of a vehicle headlight control device according to an exemplary embodiment of the present invention, wherein the microcontroller 3 is activated and the switching logic circuit 2 is controlled by the microcontroller 3 to the off state.

[0031] like Figures 1 to 3 As shown, in the illustrated embodiment, the microcontroller 3 is connected to the control terminal 2c of the switching logic circuit 2, and is used to control the state of the switching logic circuit 2. Figure 3 As shown, after the microcontroller 3 is woken up to normal operating status, the microcontroller 3 sends a lighting control signal to port CAN2 of the driver chip 5 and controls the switching logic circuit 2 to the off state, so as to prevent the lighting control signal from the vehicle main controller from being sent to port 5a of the driver chip 5. In the illustrated embodiment, when port CAN2 of the driver chip 5 receives the lighting control signal from the microcontroller 3, the driver chip 5 keeps the vehicle light 6 in the lit state.

[0032] like Figure 3 As shown in the illustrated embodiment, after the microcontroller 3 is woken up to normal operating status, port 5a of the driver chip 5 immediately stops receiving lighting control signals from the vehicle's main controller. This avoids the conflict problem of the driver chip 5 being controlled by two lighting control signals simultaneously.

[0033] like Figures 1 to 3 As shown, in the illustrated embodiment, the microcontroller 3 has a port 3a. Port 3a of the microcontroller 3 is connected to the control terminal 2c of the switching logic circuit 2. When the microcontroller 3 is in sleep mode or in the process of being woken up, port 3a of the microcontroller 3 outputs a low level to control the switching logic circuit 2 to be in an on state. Figure 2 As shown. When microcontroller 3 is in normal working condition, port 3a of microcontroller 3 outputs a high level to control the switching logic circuit 2 to be in the off state, as shown. Figure 3 As shown.

[0034] like Figure 2 and Figure 3 As shown, in the illustrated embodiment, the switch logic circuit 2 includes an electronic switch S1. Port 3a of the microcontroller 3 is used to control the on and off of the electronic switch S1. Figure 2 As shown, when electronic switch S1 is turned off, switch logic circuit 2 is in the on state, allowing the lighting control signal from the vehicle main controller to be sent to port 5a of driver chip 5. Figure 3 As shown, when the electronic switch S1 is turned on, the switch logic circuit 2 is in the off state to prevent the lighting control signal from the vehicle main controller from being sent to port 5a of the driver chip 5.

[0035] like Figure 3 As shown in the illustrated embodiment, when the electronic switch S1 is turned on, the port 5a of the driver chip 5 is grounded via the switch logic circuit 2 to stop receiving the lighting control signal from the vehicle main controller.

[0036] like Figures 1 to 3 As shown in the illustrated embodiment, the vehicle lighting control device also includes a CAN transceiver 4. The CAN transceiver 4 is connected between the CAN1 port of the microcontroller 3 and the CAN2 port of the driver chip 5, and is used to transmit communication data between the two.

[0037] like Figures 1 to 3 As shown in the illustrated embodiment, the vehicle lighting control device further includes a vehicle lighting protection circuit 1. The vehicle lighting protection circuit 1 has a port 1a for receiving lighting control signals from the vehicle's main controller and a port 1b for outputting the received lighting control signals. In the illustrated embodiment, port 1b of the vehicle lighting protection circuit 1 is connected to the input terminal 2a of the switching logic circuit 2 and the port 3b of the microcontroller 3, for transmitting the received lighting control signals to the input terminal 2a of the switching logic circuit 2 and the port 3b of the microcontroller 3, respectively.

[0038] like Figures 1 to 3 As shown in the illustrated embodiment, when port 1a of the headlight protection circuit 1 receives a lighting control signal from the vehicle main controller, port 1b of the headlight protection circuit 1 outputs a high level, causing port 5a of the driver chip 5 and port 3b of the microcontroller 3 to be at a high level, thereby activating the driver chip 5 and waking up the microcontroller 3.

[0039] like Figures 1 to 3 As shown, in another exemplary embodiment of the present invention, a vehicle headlight control method is also disclosed. This vehicle headlight control method mainly includes the following steps:

[0040] S10: Provides, for example Figure 1 The vehicle lighting control device shown; and

[0041] S20: When a lighting control signal is received from the vehicle main controller and the microcontroller 3 has not yet been woken up, the switch logic circuit 2 is in the conducting state, so that the lighting control signal from the vehicle main controller is sent to port 5a of the driver chip 5 to light up the vehicle lights 6 before the microcontroller 3 is woken up.

[0042] like Figures 1 to 3 As shown in the illustrated embodiment, the aforementioned vehicle light control method further includes the following steps:

[0043] S30: When the microcontroller 3 has been woken up to normal working state, the microcontroller 3 sends a lighting control signal to the CAN2 port of the driver chip 5 and controls the switch logic circuit 2 to the off state, so as to prevent the lighting control signal from the vehicle main controller from being sent to the port 5a of the driver chip 5.

[0044] This invention relates to a common vehicle headlight control scheme, specifically a solution for timely control of headlight functions before the microcontroller 3 of the headlight control device is woken up. It belongs to the category of improved headlight electronic control schemes. In existing technologies, if a vehicle is started from sleep mode and the headlights are turned on solely through software control, there is a significant time delay, resulting in untimely illumination and posing certain risks. This invention overcomes this technical defect, greatly reducing the time delay from the control end to headlight illumination, effectively improving the timeliness of headlight control response. This invention particularly relates to functional safety-related headlights, such as brake lights (ASIL B safety level) and turn signals (ASIL A), which require instantaneous and effective responses to control commands from the higher-level control unit. This invention effectively solves this problem, thereby meeting customer-required control time and significantly reducing risks during vehicle operation.

[0045] This invention provides a control scheme for directly activating the lights before the microcontroller 3 of the vehicle lighting control device is activated. This invention can meet customer requirements for a very short headlight activation time. As long as the light control request interface provides a high voltage, the driver chip 5 can receive the digital input signal from the hardware circuit, and then output the relevant current through the pre-configured OTP file register, thus powering and illuminating the headlight 6, without waiting for the microcontroller to start and then controlling the driver chip via software. After the microcontroller starts, the software takes over controlling the driver chip. Typically, controlling the driver chip 5 via hardware digital input signals takes only a few milliseconds, while software control takes tens of milliseconds. Therefore, this invention can significantly reduce the headlight activation delay, improve the timeliness of headlight activation, and thus improve vehicle safety performance.

[0046] As mentioned above, this invention eliminates the need for the microcontroller to wake up before turning on the lights. Instead, it directly turns on the lights through a hardware module, with negligible delay time. This solves the problem of delay time when the microcontroller wakes up in the low-power mode of the vehicle lights, achieving timely control of the lights and greatly improving the safety level of vehicle lighting.

[0047] This invention is applicable to the control of various common automotive headlights and taillights, especially for vehicle lights with the Infineon TLD7002-16 driver chip. It can directly control the lights when the microcontroller in the vehicle light controller is not started or cannot work properly.

[0048] like Figures 1 to 3 As shown in the illustrated embodiment, the headlight protection circuit 1 is used for power filtering and reverse connection protection of the input power or headlight control input. The switching logic circuit 2 is used for on / off control between the headlight control signal and port 5a of the driver chip 5. The microcontroller MCU 3 performs software logic processing and diagnostic feedback. The CAN transceiver 4 is used to transmit communication data between the microcontroller 3 and the driver chip 5. The driver chip 5 can illuminate the headlight 6 according to the received headlight control signal. Port 3a of the microcontroller 3 is used to control the switching logic circuit 2 to the off state after the microcontroller 3 completes startup, thereby preventing the headlight control signal from the vehicle's main controller from being sent to port 5a of the driver chip 5.

[0049] This invention presents a novel vehicle lighting control scheme, specifically a scheme that directly activates the lights even when the microcontroller 3 is not activated. Compared to commonly used technologies, this invention, in its circuit design, provides both a CAN interface and a digital input interface for the Infineon TLD7002-16 chip, which are connected to the microcontroller via a CAN transceiver and a digital input module, respectively. The CAN interface receives control signals from the microcontroller, while the digital input interface receives digital signals, such as lighting control signals, from the vehicle's main controller.

[0050] like Figures 1 to 3As shown in the illustrated embodiment, in this invention, the microcontroller of the vehicle lighting control device provides a digital output port 3a for controlling the digital input port 5a of the driver chip 5. When the microcontroller is not working, the digital output port 3a is at a low level, and the switching logic circuit 2 is in a conducting state, allowing the lighting control signal from the vehicle's main controller to be transmitted to the driver chip's port 5a. At this time, the driver chip 5's port 5a is pulled high, and the vehicle light 6 is illuminated. When the microcontroller 3 is working, the digital output port 3a is pulled high to control the switching logic circuit 2 to a cutoff state, preventing the lighting control signal from the vehicle's main controller from being transmitted to the driver chip's port 5a. At this time, the lighting control is taken over by the microcontroller 3. The microcontroller 3 sends CAN commands through the CAN communication interface CAN1 to the CAN interface of the driver chip 5 for lighting control. This control takeover method avoids the conflict problem of CAN signals and digital input signals simultaneously controlling the driver chip 5.

[0051] Based on the technical solution of this invention, the lighting delay is greatly reduced, which not only improves the timeliness of vehicle lighting, but also improves the safety and reliability of driving functions and reduces safety hazards on highways.

[0052] The following will refer to Figure 2 and Figure 3 Let me explain the headlight control process.

[0053] First, such as Figure 2 As shown, when the microcontroller 3 of the vehicle lighting control device is in a low-power sleep state, the microcontroller 3 does not work. At this time, port 3a of the microcontroller 3 is in the initial state and outputs a low level, and electronic switch S1 is in the open state. If a vehicle lighting control signal is received from the vehicle main controller, port 1b of the vehicle lighting protection circuit 1 will be at a high level, and the microcontroller 3 will start up. However, since the microcontroller 3 needs a certain amount of time to start up, i.e., it takes a certain amount of time to wake up the microcontroller 3, during the startup process of the microcontroller 3 and while the microcontroller 3 is being woken up, the lighting control signal is directly output to port 5a of the driver chip 5 after passing through the vehicle lighting protection circuit 1. After port 5a of the driver chip 5 receives a high level, it is activated, thereby outputting current to provide to the vehicle lighting 6, and thus the vehicle lighting 6 is lit.

[0054] Then, as Figure 3 As shown, after the microcontroller 3 completes its startup, port 3a of the microcontroller 3 is pulled high and begins CAN communication with the driver chip 5. At this time, electronic switch S1 is turned on by port 3a of the microcontroller 3, causing port 5a of the driver chip 5 to go low. The driver chip 5 then stops receiving signals from port 5a and begins to communicate via the CAN interface. Figure 1The CAN2 port in the microcontroller receives control commands from the microcontroller 3. At this time, the headlight 6 continues to illuminate and can output corresponding effects according to the CAN commands.

[0055] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing structural or principle conflicts, and these changes should fall within the protection scope of this invention.

[0056] Although the invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the invention and should not be construed as limiting the invention.

[0057] While some embodiments of the general concept of the invention have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general concept of the invention, the scope of which is defined by the claims and their equivalents.

[0058] It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude multiple elements. Furthermore, any reference numerals in the claims should not be construed as limiting the scope of the invention.

Claims

1. A vehicle lighting control device, characterized in that, include: The driver chip (5) is adapted to turn on the vehicle lights (6) according to the received lighting control signal; The switching logic circuit (2) is connected to the driving chip (5); and The microcontroller (3) is connected to the driver chip (5) and is used to communicate with the driver chip (5). Before the microcontroller (3) is woken up from the sleep state, the switching logic circuit (2) is in the on state to allow the lighting control signal from the vehicle main controller to be sent to the driver chip (5). When the driver chip (5) receives the lighting control signal from the vehicle main controller, the driver chip (5) immediately supplies power to the vehicle lamp (6) to light up the vehicle lamp (6). The microcontroller (3) has a port 3a, and the switch logic circuit (2) includes an electronic switch S1. The port 3a of the microcontroller (3) is connected to the control terminal 2c of the switch logic circuit (2) for controlling the opening and closing of the electronic switch S1. When the microcontroller (3) is in the sleep state or in the process of being woken up, the port 3a of the microcontroller (3) outputs a low level to control the electronic switch S1 to open, so that the switch logic circuit (2) is in the conduction state. When the microcontroller (3) is in normal working condition, the port 3a of the microcontroller (3) outputs a high level to control the electronic switch S1 to turn on, so that the switch logic circuit (2) is in the off state, so as to prevent the lighting control signal from the vehicle main controller from being sent to the port 5a of the driver chip (5), and the microcontroller (3) sends the lighting control signal to the driver chip (5).

2. The vehicle lighting control device according to claim 1, characterized in that: The switching logic circuit (2) is connected to port 5a of the driver chip (5), the microcontroller (3) is connected to port CAN2 of the driver chip (5), and the microcontroller (3) is connected to the control terminal 2c of the switching logic circuit (2) to control the state of the switching logic circuit (2).

3. The vehicle light control device according to claim 1, characterized in that: When the electronic switch S1 is turned on, the port 5a of the driver chip (5) is grounded via the switch logic circuit (2) to stop receiving the lighting control signal from the vehicle main controller.

4. The vehicle lighting control device according to claim 2, characterized in that, Also includes: A CAN transceiver (4) is connected between port CAN1 of the microcontroller (3) and port CAN2 of the driver chip (5) for transmitting communication data between the two.

5. The vehicle light control device according to any one of claims 1-4, characterized in that, Also includes: The vehicle lighting protection circuit (1) has a port 1a for receiving lighting control signals from the vehicle's main controller and a port 1b for outputting the received lighting control signals. The port 1b of the vehicle light protection circuit (1) is connected to the input terminal 2a of the switch logic circuit (2) and the port 3b of the microcontroller (3), and is used to transmit the received lighting control signal to the input terminal 2a of the switch logic circuit (2) and the port 3b of the microcontroller (3), respectively.

6. The vehicle lighting control device according to claim 5, characterized in that: When port 1a of the headlight protection circuit (1) receives a lighting control signal from the vehicle main controller, port 1b of the headlight protection circuit (1) outputs a high level, which makes port 5a of the driver chip (5) and port 3b of the microcontroller (3) high level, so as to activate the driver chip (5) and wake up the microcontroller (3).

7. A vehicle lighting control method, applied to the vehicle lighting control device according to any one of claims 1-6, characterized in that, Includes the following steps: When a lighting control signal is received from the vehicle main controller and the microcontroller (3) has not yet been woken up, the switch logic circuit (2) is in the on state, so that the lighting control signal from the vehicle main controller is sent to port 5a of the driver chip (5) to light up the vehicle light (6) before the microcontroller (3) is woken up.

8. The vehicle light control method according to claim 7 further includes the step of: When the microcontroller (3) has been woken up to normal working state, the microcontroller (3) sends a lighting control signal to the CAN2 port of the driver chip (5) and controls the switch logic circuit (2) to the cut-off state to prevent the lighting control signal from the vehicle main controller from being sent to the port 5a of the driver chip (5).

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