Vehicle instrument test system and dial switch, power supply module, voltage switching circuit, communication module, lamp and test method thereof

Abstract

The invention discloses a vehicle instrument testing system and a dial switch, a power supply module, a voltage switching circuit, a communication module, a lamp and a testing method thereof, and belongs to the technical field of vehicle testing. Wherein the power supply module supplies power to the control module and the communication module; the first bit output of the dial switch controls the positive control / negative control modes of various lamps, and the state change of the various lamps is used as a visual criterion for the normal function of the instrument; the input end of the voltage switching circuit is connected with the control module, and the output end of the voltage switching circuit is connected with the voltage detection end of the instrument module; and the communication module establishes a communication link with the instrument module. The I / O interface of the dial switch is connected with various lamps at the same time, when the instrument lamps are tested, the control signals of the positive control mode or the negative control mode are input into the lamps through the dial switch, whether the lighting states of the lamps correspond to the control signals or not is observed, the various lamps in the instrument can be tested quickly, and the testing efficiency is improved. And the instrument testing efficiency is effectively improved.

Description

[0001] The present application is a divisional application of the patent application entitled "Vehicle Instrument Test System and Test Method", the original application date is November 4, 2021, and the application number is 202111301592.7. TECHNICAL FIELD

[0002] The present application relates to the technical field of vehicle testing, in particular to a vehicle instrument test system and a dial switch, a power supply module, a voltage switching circuit, a communication module, a lamp and a test method thereof. BACKGROUND

[0003] The vehicle instrument is mainly used to indicate various dynamic indicators in the vehicle driving process, so that the driver can know the working condition of each system at any time, and ensure the safe driving of the vehicle. Therefore, the test of the vehicle instrument function is particularly important during the design process of the new vehicle product. The existing vehicle instrument test system usually tests each function one by one in a manual mode, resulting in low test efficiency. SUMMARY

[0004] The purpose of the present application is to provide a vehicle instrument test system and a dial switch, a power supply module, a voltage switching circuit, a communication module, a lamp and a test method thereof, so as to quickly test various lamps in the instrument and improve the instrument test efficiency.

[0005] One embodiment of the present application provides a dial switch of a vehicle instrument test system, the dial switch is provided with 7 I / O interfaces, wherein, The first I / O interface is connected to the control module and the driving circuit of the various lamps; the binary level output by the first I / O interface is used to switch between the positive control mode and the negative control mode of the lamp; The second to seventh I / O interfaces are connected to the communication module; the 6-bit binary combination output by the second to seventh I / O interfaces is used to select one of the one-wire communication program, the 485 communication program and the CAN communication program of the communication module to load.

[0006] Optionally, when the first I / O interface outputs a high level, the control module enters the positive control mode, and the 3.3V signal is amplified to 12V through two-stage NPN triode to drive the lamp to light; when the first I / O interface outputs a low level, the control module enters the negative control mode, and the 3.3V signal is turned on through a single-stage NPN triode to make the corresponding lamp function end of the instrument grounded and extinguished.

[0007] One embodiment of the present application provides a power supply module of a vehicle instrument test system, the power supply module is a 48-85V single power supply mode, comprising a wide voltage power supply unit, a filter unit, a first power supply chip and a second power supply chip; The input end of the wide piezoelectric power unit is used for receiving 48-85V voltage input, and the output end is connected to the input end of the filter unit; The output end of the filter unit is connected to the input end of the first power chip; The input voltage of the first power chip is converted to output 5V voltage to the communication module, and the output end is connected to the input end of the second power chip; The second power chip converts 5V voltage to 3.3V voltage and outputs to the control module; Wherein, the 48-85V voltage input is provided with another output, which is used for simulating the vehicle battery power to supply power to the instrument module.

[0008] One embodiment of the present application provides a voltage switching circuit of a vehicle instrument test system, comprising: a first resistor R76, a second resistor R77, a third resistor R78, a first triode Q21 and a first switch J15. One end of the first resistor R76 is connected to the output port of the control module, and the other end of the first resistor R76 is connected to one end of the second resistor R77 and the base of the first triode Q21. The other end of the second resistor R77 is connected to the emitter of the first triode Q21. The collector of the first triode Q21 is connected to the input end of the first switch J15 through the third resistor R78. The first output end of the first switch J15 is grounded, and the second output end is suspended.

[0009] Optionally, the control module continuously sends intermittent voltage selection switching output signals, and outputs low level or suspended signals to the instrument module through the voltage switching circuit; the first switch J15 in the voltage switching circuit is toggled, if the power display changes and the power value meets the requirements, the function is normal.

[0010] One embodiment of the present application provides a communication module of a vehicle instrument test system, the communication module integrates a one-wire communication program, a 485 communication program and a CAN communication program; When the one-wire communication program is loaded, the one-wire protocol data output by the control module is divided into two paths: the first path is amplified to 5V signal output through two NPN triodes and their peripheral circuits; the second path is amplified to 85V signal output through a pair of NPN and PNP complementary triodes and their peripheral circuits; wherein, the 5V signal output end and the 85V signal output end can work at the same time.

[0011] One embodiment of the present application provides a variety of lamps in a vehicle instrument test system, comprising: left turn light, right turn light, high beam light, outline light and low beam light; The left turn light, the right turn light, the high beam light, the boundary marker light and the low beam light are controlled by the first I / O interface of the same group of code switch; the control module continuously sends intermittent signals to drive the left turn light, the right turn light, the high beam light, the boundary marker light and the low beam light to light up or turn off in the positive control / negative control mode.

[0012] Optionally, a gear switching module and a voice output module connected with the control module are further provided; the gear switching module is used for receiving a voice input signal and sending a voice switching signal to the control module; the voice output module is used for lighting up a corresponding indicator light according to a voice output signal sent by the control module; the indicator light includes a left turn light test indicator light, a right turn light test indicator light, a high beam light test indicator light and a low beam light test indicator light.

[0013] One embodiment of the present application provides a vehicle instrument test system, which is integrated with a code switch as defined above, a power module, a voltage switching circuit, a communication module and a plurality of lamps; The power module supplies power to the control module and the communication module; the first bit of the code switch controls the positive control / negative control mode of the plurality of lamps; the state change of the plurality of lamps serves as a visual criterion for normal instrument function; the input end of the voltage switching circuit is connected with the control module, and the output end of the voltage switching circuit is connected with the voltage detection end of the instrument module; the communication module establishes a communication link with the instrument module.

[0014] One embodiment of the present application provides a vehicle instrument test method, which includes the following steps: When the 48-85V power supply is turned on, the control module reads the 7-bit binary data set by the code switch; the first bit of the binary data is used to determine whether the lamp control mode is the positive control mode or the negative control mode, and the second bit to the seventh bit of the binary data is used to select one of the one-wire-through communication program, the 485 communication program or the CAN communication program; The control module continuously sends intermittent output signals of the left turn light, the right turn light, the high beam light, the boundary marker light and the low beam light; if the positive control mode is adopted, the 3.3V signal is amplified to 12V by two-stage NPN triode and then output to the instrument module; if the negative control mode is adopted, the 3.3V signal is turned on by single-stage NPN triode to make the corresponding lamp function end of the instrument module grounded; The first switch in the voltage switching circuit is switched between the first output end and the second output end, and the control module outputs a low-level signal or a suspended signal to the instrument module to simulate different battery voltage gears; When the communication module loads the selected communication program, the control module continuously sends data frames of the one-wire-through protocol, the 485 protocol or the CAN protocol to the instrument module; if the one-wire-through communication program is adopted, the 5V signal output end and the 85V signal output end work simultaneously; Receive the speed gear switching signal from the instrument module, the speed gear switching signal is low level for about 50ms; in response to the signal, the control module changes the level state of its output IO port, and drives the corresponding left turn light test indicator light, right turn light test indicator light, high beam light test indicator light or low beam light test indicator light in the voice output module.

[0015] The embodiment of the present application has the following beneficial effects: The dial switch of the vehicle instrument test system is connected with multiple lamps and lanterns at the same time, when testing the instrument lamps and lanterns, the control module inputs the control signal of positive control mode or negative control mode to the lamps and lanterns through the dial switch, and observes whether the light-on state of each lamp and lantern corresponds to the control signal, which can quickly and conveniently test multiple lamps and lanterns in the instrument, without testing each lamp and lantern manually one by one, thereby effectively improving the efficiency of instrument testing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structural schematic diagram of a vehicle instrument test system is provided for the embodiment of the present application; Figure 2 A structural schematic diagram of a power supply module is provided for the embodiment of the present application; Figure 3 A structural schematic diagram of a voltage switching circuit is provided for the embodiment of the present application; Figure 4 Another structural schematic diagram of a vehicle instrument test system is provided for the embodiment of the present application; Figure 5 A flowchart of a vehicle instrument test method is provided for the embodiment of the present application; Figure 6 Another flowchart of a vehicle instrument test method is provided for the embodiment of the present application; Wherein, the figure mark is: 10, instrument module; 20, control module; 30, program selection module; 40, power supply module; 401, wide voltage power supply unit; 402, filter unit; 403, first power supply chip; 404, second power supply chip; 50, communication module. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] In the description of the present application, it needs to be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0019] In the description of the present application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] Referring to Figure 1 One embodiment of the present application provides a vehicle instrument test system, comprising: an instrument module 10 and a control module 20, and a power supply module 40, a communication module 50 and a program selection module 30 connected with the control module 20. The communication module 50 is connected with the instrument module 10.

[0021] The program selection module 30 comprises a DIP switch, any one I / O interface of the DIP switch is connected with the control module 20 and a plurality of lamps, and the plurality of lamps comprises a left turn lamp, a right turn lamp, a high beam lamp, a hall lamp and a low beam lamp; the remaining I / O interfaces of the DIP switch are connected with the communication module 50.

[0022] In one embodiment, the DIP switch is provided with 7-bit binary data, wherein the first bit binary data in the 7-bit binary data is used to select the control mode of the lamp output signal, and the control mode comprises a positive control mode and a negative control mode; the second bit to the seventh bit binary data in the 7-bit binary data is used to select the communication program in the communication module 50.

[0023] The embodiment of the present application sets the DIP switch in the program selection module 30, and the I / O interface of the DIP switch is connected with a plurality of lamps at the same time, when the instrument lamp test is carried out, the control module 20 inputs the control signal of the positive control mode or the negative control mode to the lamp through the DIP switch, and observes whether the light-on state of each lamp corresponds to the control signal, so that the plurality of lamps in the instrument can be tested quickly and conveniently, without testing each lamp one by one manually, thereby the efficiency of the instrument test can be effectively improved.

[0024] In the embodiment of the present application, the power module 40 is a 48-85V single power supply mode. The present application uses 48-85V single power supply to power, greatly reducing the occurrence of test personnel connection error or reverse error caused by multiple voltage power supply at the same time, and is conducive to improving the safety of the test.

[0025] Referring to Figure 2 In one embodiment, the power module 40 includes a wide voltage power supply unit 401, a filter unit 402, a first power supply chip 403 and a second power supply chip 404. The input end of the wide voltage power supply unit 401 is connected with the voltage input end, the output end of the wide voltage power supply unit 401 is connected with the input end of the filter unit 402, the output end of the filter unit 402 is connected with the input end of the first power supply chip 403, and the output end of the first power supply chip 403 is connected with the input end of the second power supply chip 404. The output ends of the first power supply chip 403 and the second power supply chip 404 are connected with the communication module 50 and the control module 20 respectively.

[0026] In one embodiment, the power input is 85V. One way of analog vehicle battery capacity is output to the instrument; another way is to be stepped down to 12V by the 48V-85V wide voltage power supply unit 401, and then filtered by the filter capacitor in the filter unit 402, and then output 5V voltage to the CAN chip, 485 chip and one-wire through chip of the communication module 50 through the first power supply chip 403, and then output 3.3V voltage to the CPU chip of the control module 20 through the second power supply chip 404 for power supply.

[0027] In one embodiment, the system further comprises a gear switching module connected with the control module 20, the gear switching module is used for receiving a voice input signal and sending a voice switching signal to the control module 20.

[0028] In one embodiment, the system further comprises a voice output module connected with the intelligent instrument test system, the voice output module comprises a plurality of indicator lights, and the plurality of indicator lights comprise a left turn light test indicator light, a right turn light test indicator light, a high beam light test indicator light and a low beam light test indicator light. The voice output module is used for lighting the corresponding indicator light according to the voice output signal sent by the control module 20.

[0029] In one embodiment, the CPU chip has 8-way IO output through program control, the control module 20 continuously sends the output signal of the positive control mode and the negative control mode of at most four kinds of lamps and lanterns such as left turn light, right turn light, high beam light, outline lamp and low beam light, and selects the output signal through the first bit of the DIP switch. If it is a positive control mode, the 3.3V signal is amplified to 12V output to the instrument through two NPN triodes and their peripheral circuits. If it is a negative control mode, the 3.3V signal makes the corresponding function of the intelligent instrument ground through an NPN triode.

[0030] In one embodiment, a rotary knob can also be provided, and the rotary knob is used to select the positive control mode or the negative control mode by selecting the positive and negative control switch, so as to manually turn on the lamp through the rotary knob. In the positive control mode, the switch is directly connected to the 12V voltage and the voltage is output through the rotary knob, and in the negative control mode, the switch is directly connected to the ground and the voltage is output through the rotary knob.

[0031] Referring to Figure 3 In one embodiment, the system further comprises a voltage switching module, and the voltage switching module comprises a voltage switching circuit, and the voltage switching circuit comprises a first resistor R76, a second resistor R77, a third resistor R78, a first triode Q21 and a first switch J15.

[0032] One end of the first resistor R76 is connected to the control module 20, and the other end of the first resistor R76 is connected to one end of the second resistor R77 and the base of the first triode Q21, respectively. The other end of the second resistor R77 is connected to the emitter of the first triode Q21. The collector of the first triode Q21 is connected to the input end of the first switch J15 through the third resistor R78. The first output end of the first switch J15 is grounded, and the second output end of the first switch J15 is suspended.

[0033] In the embodiment of the application, the voltage output end is grounded or suspended through the two output ends of the first switch J15, so as to change the voltage gear, so as to test the voltage in the instrument.

[0034] In one embodiment, the communication module comprises but is not limited to a one-wire communication program, a 485 communication program and a CAN communication program. In the embodiment of the application, the communication module 50 comprises a plurality of communication programs, so as to be suitable for a plurality of different communication scenes, and the reliability of communication is improved.

[0035] When the one-wire communication program is used, the one-wire communication program is divided into 85V output and 5V output, and is divided into 5V output and 85V and 5V two optional output, and the two paths can output simultaneously. After the CPU of the control module 20 is powered on, the one-wire protocol data is continuously sent to the instrument module 10. In the 5V output, the one-wire protocol data is amplified to a 5V signal through two NPN triodes and peripheral circuits. In the 85V output, the one-wire protocol data is amplified to an 85V signal through a pair of complementary NPN and PNP triodes and peripheral circuits.

[0036] Referring to Figure 4 Another structural schematic diagram of a vehicle instrument test system provided in the embodiment of the application is shown. In this embodiment, the specific test operation process is as follows: The 48-85V power supply is turned on, the required program is selected through the DIP switch, the main switch and the 12V power supply switch are turned on, and if the instrument module 10 is started, the power supply is normal. selecting the positive control mode or the negative control mode of the lamp through the dial switch, if the lamp is respectively turned on or turned off, the lamp function is normal; or selecting the positive control mode or the negative control mode of the lamp through the dial switch, rotating the knob to the corresponding gear, if the corresponding lamp is turned on, the function is normal; receiving a voice input signal, if the corresponding indicator light is turned on or turned off, the lamp function is normal; turning on the communication module 50 switch, if the speed, speed gear and function connection state set by the program are displayed on the instrument module 10, the function is normal; turning on the power switch, if the power is displayed and the power value meets the requirements, the function is normal; dialing the dial switch in the voltage switching module, if the power display changes and the power value meets the requirements, the function is normal.

[0037] According to the embodiment of the present application, the following beneficial effects can be achieved: the embodiment of the present application sets the dial switch in the program selection module 30, which is connected with multiple lamps through the I / O interface of the dial switch; when testing the instrument lamp, the control module 20 inputs the control signal of the positive control mode or the negative control mode to the lamp through the dial switch, and observes whether the light-on state of each lamp corresponds to the control signal, which can quickly and conveniently test multiple lamps in the instrument without testing each lamp one by one manually, thereby effectively improving the instrument test efficiency.

[0038] Referring to Figure 5 An embodiment of the present application provides a vehicle instrument test method, which is suitable for the vehicle instrument test system described above, and includes the following steps. S1, turning on the power supply of the power supply module 40, and selecting the program to be tested through the dial switch, if the instrument is normally started, it is judged that the power supply of the power supply module 40 is normal; S2, selecting the control mode of the lamp through the dial switch, if the positive control mode in the control mode corresponds to the turning on of the lamp, and the negative control mode in the control mode corresponds to the turning off of the lamp, it is judged that the lamp function is normal; S3, receiving a voice input control signal, and controlling the corresponding indicator light according to the voice input control signal, if the turned-on indicator light is the preset indicator light, it is judged that the light function corresponding to the indicator light is normal.

[0039] Referring to Figure 6Another flowchart of a vehicle instrument testing method provided by the embodiment of the present application is shown in the figure. In this embodiment, the clock, IO port, serial port, etc. of the control module 20 are initialized, at which time the control module 20 reads the 7-bit binary data set by the DIP switch, wherein the first bit is used to select the positive control mode or negative control mode of the left turn light, right turn light, high beam light, boundary light, low beam light, etc. After the above preparation work is completed, the control module 20 continuously sends the intermittent output signals of the left turn light, right turn light, high beam light, boundary light, low beam light, etc. and voltage selection switching, and outputs the low level or suspended signal to the instrument module 10 through the voltage switching module.

[0040] After the 7 IO ports of the single-chip microcomputer in the control module 20 read the high and low levels set by the DIP switch, they are converted into a 7-bit binary number, and the last 6 bits are converted into a 16-bit binary number, and the required 1-wire / 485 / CAN communication data is selected.

[0041] The instrument module 10 can also have a speed switching module, and the speed gear switching signal is a low level signal of about 50 ms. After the IO port of the single-chip microcomputer receives the speed gear switching signal from the instrument module 10, the output IO port will change the high and low level state once, and output to the gear switching circuit to control the on-off change of the indicator light once.

[0042] The embodiment of the present application has the following beneficial effects: the embodiment of the present application selects the program or control mode of the lamp to be tested through the DIP switch, and judges whether the power supply of the power module 40 is normal according to whether the instrument is normally started, and judges whether the lamp function is normal according to the on-off state of the lamp, so that the multiple functions of the instrument can be quickly and conveniently tested, and the working efficiency of the test is further improved.

[0043] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also considered to be within the protection scope of the present application.

Claims

1. A DIP switch for a vehicle instrument testing system, characterized in that, The dial switch sets 7-bit I / O interface, wherein, The first bit I / O interface is connected with the control module and the driving circuit of the plurality of lamps simultaneously; the binary level output by the first bit I / O interface is used for switching between the positive control mode and the negative control mode of the lamps; The second to seventh bit I / O interfaces are connected with the communication module; the 6-bit binary combination output by the second to seventh bit I / O interfaces is used for selecting one of the one-wire communication program, the 485 communication program and the CAN communication program to load.

2. The rotary switch according to claim 1, wherein When the first bit I / O interface outputs high level, the control module enters the positive control mode, and the 3.3V signal output by the control module is amplified to 12V through two-stage NPN triode and then drives the lamps to light up; when the first bit I / O interface outputs low level, the control module enters the negative control mode, and the 3.3V signal output by the control module is amplified to make the corresponding lamp function end of the instrument grounded through single-stage NPN triode and then the lamps are extinguished.

3. A power module for a vehicle gauge test system, the power module comprising: The power module is a 48-85V single power supply mode, which comprises a wide voltage power supply unit, a filter unit, a first power chip and a second power chip. The input end of the wide voltage power supply unit is used for receiving 48-85V voltage input, and the output end thereof is connected with the input end of the filter unit; The output end of the filter unit is connected with the input end of the first power chip; The input voltage of the first power chip is converted and then 5V voltage is output to the communication module, and the output end thereof is connected with the input end of the second power chip; The second power chip converts 5V voltage into 3.3V voltage and then outputs the same to the control module; The 48-85V voltage input is provided with another output, which is used for simulating the vehicle battery power to supply power to the instrument module.

4. A voltage switching circuit for a vehicle gauge test system, comprising: It comprises: The first resistance R76, the second resistance R77, the third resistance R78, the first triode Q21 and the first switch J15; One end of the first resistance R76 is connected with the output port of the control module, and the other end thereof is connected with one end of the second resistance R77 and the base of the first triode Q21; the other end of the second resistance R77 is connected with the emitter of the first triode Q21; the collector of the first triode Q21 is connected with the input end of the first switch J15 through the third resistance R78; the first output end of the first switch J15 is grounded, and the second output end thereof is suspended.

5. The voltage switching circuit of claim 4, wherein, The control module continuously sends the output signal of the intermittent voltage selection switching, and outputs low level or suspended signal to the instrument module through the voltage switching circuit; the first switch J15 in the voltage switching circuit is dialed, if the power display changes and the power value meets the requirement, the function is normal.

6. A communication module of a vehicle instrument test system, characterized by, The communication module is integrated with the one-wire communication program, the 485 communication program and the CAN communication program; When the one-wire communication program is loaded, the one-wire protocol data output by the control module is divided into two paths: the first path is amplified to 5V signal output through two NPN triodes and peripheral circuits; the second path is amplified to 85V signal output through a pair of complementary NPN and PNP triodes and peripheral circuits; wherein, the 5V signal output end and the 85V signal output end can work simultaneously.

7. A plurality of lamps in a vehicle instrument testing system, characterized by, It comprises: Left turn light, right turn light, high beam, outline marker light and low beam light; The left turn light, right turn light, high beam, outline marker light and low beam light are controlled by the first I / O interface of the same group of DIP switches; the control module continuously sends intermittent signals to drive the left turn light, right turn light, high beam, outline marker light and low beam light to light up or turn off in the positive control / negative control mode.

8. The plurality of light fixtures of claim 7, wherein, The gear switching module and the voice output module connected with the control module are further provided; the gear switching module is used for receiving voice input signals and sending voice switching signals to the control module; the voice output module is used for lighting up corresponding indicator lights according to voice output signals sent by the control module; the indicator lights include left turn light test indicator light, right turn light test indicator light, high beam test indicator light and low beam test indicator light.

9. A vehicle instrument testing system, characterized by, Integrated with: The DIP switch as defined in claim 1; The power module as defined in claim 3; The voltage switching circuit as defined in claim 4; The communication module as defined in claim 6; And the multiple lamps as defined in claim 7; The power module supplies power to the control module and the communication module; the first bit of the DIP switch controls the positive control / negative control mode of the multiple lamps; the state change of the multiple lamps is used as a visual criterion for normal instrument function; the input end of the voltage switching circuit is connected with the control module, and the output end of the voltage switching circuit is connected with the voltage detection end of the instrument module; the communication module establishes a communication link with the instrument module.

10. A vehicle instrument testing method characterized by, The steps include: Turning on the 48-85V power supply, and the control module reads the 7-bit binary data set by the DIP switch; the first bit of the binary data is used to determine whether the lamp control mode is the positive control mode or the negative control mode, and the second bit to the seventh bit of the binary data is used to select one of the one-wire-through communication program, the 485 communication program or the CAN communication program; The control module continuously sends intermittent output signals of the left turn light, right turn light, high beam, outline marker light and low beam light; if it is the positive control mode, a 3.3V signal is amplified to 12V by two-stage NPN triode and then output to the instrument module; if it is the negative control mode, a 3.3V signal is conducted by single-stage NPN triode to make the corresponding lamp function end of the instrument module grounded; The first switch in the voltage switching circuit is switched between the first output end and the second output end, and the control module outputs low level or suspended signal to the instrument module to simulate different battery voltage gears; After the communication module loads the selected communication program, the control module continuously sends data frames of the one-wire-through protocol, 485 protocol or CAN protocol to the instrument module; if the one-wire-through communication program is used, the 5V signal output end and the 85V signal output end work simultaneously; The speed gear switching signal from the instrument module is received, which is a low level lasting about 50ms; in response to the signal, the control module changes the level state of its output IO port and drives the corresponding left turn light test indicator light, right turn light test indicator light, high beam test indicator light or low beam test indicator light in the voice output module to light up.

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