Vehicle lamp fault diagnosis system

Abstract

The utility model discloses a vehicle lamp fault diagnosis system which comprises a fault generation module and a fault diagnosis control module. The fault diagnosis control module is used for sending a test signal; the fault generation module is connected with the fault diagnosis control module and generates a simulation fault action signal according to the test signal; the tested vehicle lamp and the fault generation module are used for detecting the simulated fault action signal and generating a fault diagnosis code; the fault diagnosis control module is also connected with the tested vehicle lamp and is used for receiving the fault diagnosis code. According to the utility model, the fault sending module of the to-be-tested vehicle lamp is arranged, the to-be-tested vehicle lamp is diagnosed by adopting a simulated fault action, the to-be-tested vehicle lamp generates a fault diagnosis code based on the simulated fault action and sends the fault diagnosis code to the fault diagnosis control module, and a test signal is compared with the fault diagnosis code; whether the detected vehicle lamp can correctly report the fault diagnosis code can be judged, and the correct rate of vehicle lamp detection is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting, specifically to a vehicle lighting fault diagnosis system. Background Technology

[0002] With the continuous improvement of automotive electronic functional safety, the level of intelligence of automotive lights is getting higher and higher, and the categories of headlight fault detection are also increasing. How to manage the problem of headlight fault diagnosis has become a difficult problem that everyone is trying to overcome. At present, many headlight manufacturers do not have a headlight testing platform that can simulate fault occurrence, resulting in the failure to detect faults in finished products, causing customer complaints and significant impact. Utility Model Content

[0003] To overcome the above-mentioned technical defects, this utility model provides a vehicle headlight fault diagnosis system that can diagnose vehicle headlight faults.

[0004] To solve the above problems, this utility model is implemented according to the following technical solution:

[0005] A vehicle headlight fault diagnosis system includes: a fault occurrence module and a fault diagnosis control module;

[0006] The fault diagnosis control module is used to send test signals;

[0007] The fault occurrence module is connected to the fault diagnosis and control module, and generates a simulated fault action signal based on the test signal;

[0008] The tested vehicle light and the fault generation module detect the simulated fault action signal and generate a fault diagnosis code.

[0009] The fault diagnosis control module is also connected to the vehicle light under test to receive the fault diagnosis code.

[0010] As a further improvement of this utility model, the vehicle lamp under test includes: a lamp board under test and a vehicle lamp controller, and the fault occurrence module includes: a control circuit, several simulated open circuit detection circuits, and several simulated short circuit detection circuits;

[0011] The control circuit is connected to the fault diagnosis control module and receives the test signal;

[0012] The control circuit is connected to the simulated open circuit detection circuit and the simulated short circuit detection circuit to drive the simulated open circuit detection circuit and the simulated short circuit detection circuit.

[0013] The simulated open-circuit detection circuit is connected to the vehicle light controller and the light board under test;

[0014] The simulated short-circuit detection circuit is connected to the vehicle headlight controller.

[0015] As a further improvement of this utility model, the fault occurrence module also includes: several voltage monitoring circuits and several current monitoring circuits;

[0016] The voltage monitoring circuit is connected to the control circuit and the vehicle light controller, and is used to acquire the voltage signal of the vehicle light under test and send it to the control circuit.

[0017] The current monitoring circuit is connected to the control circuit, the vehicle lamp controller, and the lamp board under test, and is used to acquire the current signal of the vehicle lamp under test and send it to the control circuit.

[0018] As a further improvement of this utility model, the fault diagnosis control module includes: a host computer and a first CAN communication circuit connected to each other; the fault occurrence module further includes: a second CAN communication circuit connected to the control circuit;

[0019] The first CAN communication circuit communicates with the second CAN communication circuit to send the voltage signal and the current signal to the host computer;

[0020] The first CAN communication circuit communicates with the vehicle lighting controller to send the fault diagnosis code to the host computer.

[0021] As a further improvement of this utility model, the simulated open-circuit detection circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first MOSFET, a second MOSFET, and a Zener diode;

[0022] The headlight controller is connected to the source of the second MOSFET, and the headlight controller is connected to the gate of the second MOSFET through the third resistor. The Zener diode, the second capacitor, and the third resistor are connected in parallel. The drain of the second MOSFET is connected to the lamp board under test, and the gate of the second MOSFET is connected to the source of the first MOSFET through the fourth resistor.

[0023] The gate of the first MOSFET is connected to the control circuit through the first resistor, the gate of the first MOSFET is grounded through the second resistor, the drain of the first MOSFET is grounded, and the first capacitor and the second resistor are connected in parallel.

[0024] As a further improvement of this utility model, the simulated short-circuit detection circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a third MOSFET;

[0025] The vehicle lighting controller is connected to the source of the third MOSFET through the fifth resistor, and the sixth, seventh, eighth, and ninth resistors are all connected in parallel with the fifth resistor;

[0026] The control circuit is connected to the gate of the third MOS transistor through the tenth resistor, and the control circuit is connected to the drain of the third MOS transistor through the tenth resistor and the eleventh resistor. The drain of the third MOS transistor is grounded, and the third capacitor is connected in parallel with the eleventh resistor.

[0027] As a further improvement of this utility model, the voltage monitoring circuit includes: a seventeenth resistor, a twelfth resistor, a thirteenth resistor, and a fourth capacitor;

[0028] The vehicle lighting controller is connected to the control circuit through the seventeenth resistor and the twelfth resistor. The vehicle lighting controller is grounded through the seventeenth resistor, the twelfth resistor, and the fourth capacitor. The thirteenth resistor and the fourth capacitor are connected in parallel.

[0029] As a further improvement of this utility model, the current monitoring circuit includes: a current monitoring chip, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, and a sixth capacitor;

[0030] The control circuit is connected to the first pin of the current monitoring chip, and the second pin of the current monitoring chip is connected to the first pin of the current monitoring chip through the fourteenth resistor. The fifth capacitor is connected in parallel with the fourteenth resistor. The second pin of the current monitoring chip is grounded.

[0031] The third pin of the current monitoring chip is connected to the vehicle light controller, the fourth pin of the current monitoring chip is connected to the lamp board under test, the third pin of the current monitoring chip is connected to the fourth pin of the current monitoring chip through the fifteenth resistor, the sixteenth resistor is connected in parallel with the fifteenth resistor, and the fifth pin of the current monitoring chip is grounded through the sixth capacitor.

[0032] Compared with the prior art, the present invention has the following advantages: The present invention is equipped with a fault diagnosis control module for sending test signals. By setting a fault sending module for the vehicle lamp under test, the vehicle lamp under test is diagnosed by simulating fault actions. The vehicle lamp under test generates a fault diagnosis code based on the simulated fault actions and sends it to the fault diagnosis control module. By comparing the test signal with the fault diagnosis code, the tester can determine whether the vehicle lamp under test can correctly report the fault diagnosis code, thereby improving the accuracy of vehicle lamp detection. Attached Figure Description

[0033] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0034] Figure 1 This is a schematic diagram of the overall structure of the vehicle headlight fault diagnosis system described in Example 1;

[0035] Figure 2 This is a schematic diagram of the simulated open-circuit detection circuit described in Example 1;

[0036] Figure 3 This is a schematic diagram of the simulated short-circuit detection circuit described in Example 1;

[0037] Figure 4 This is a schematic diagram of the voltage monitoring circuit described in Example 1;

[0038] Figure 5 This is a schematic diagram of the current monitoring circuit described in Example 1;

[0039] Figure 6 This is a schematic diagram showing the connection between the vehicle headlight fault diagnosis system described in Example 1 and different types of vehicle headlights under test;

[0040] Explanation of reference numerals in the attached diagram: 1. Fault occurrence module; 11. Control circuit; 12. Simulated open circuit detection circuit; 13. Simulated short circuit detection circuit; 14. Voltage monitoring circuit; 15. Current monitoring circuit; 16. Second CAN communication circuit; 2. Fault diagnosis control module; 21. Host computer; 22. First CAN communication circuit; 100. Tested vehicle lamp; 1001. Tested lamp board; 1002. Vehicle lamp controller. Detailed Implementation

[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0042] Example 1

[0043] This embodiment provides a vehicle headlight fault diagnosis system, such as Figure 1 As shown, it includes: a fault generation module 1 and a fault diagnosis control module 2; the fault diagnosis control module 2 is used to send test signals; the fault generation module 1 is connected to the fault diagnosis control module 2 and generates a simulated fault action signal based on the test signal; the vehicle lamp under test 100 is connected to the fault generation module 1, and the vehicle lamp under test 100 detects the simulated fault action signal and generates a fault diagnosis code; the fault diagnosis control module 2 is also connected to the vehicle lamp under test 100 and is used to receive the fault diagnosis code through the UDS protocol.

[0044] The tested vehicle light 100 includes a tested light board 1001 and a vehicle light controller 1002. The fault generation module 1 includes a control circuit 11, several simulated open-circuit detection circuits 12, and several simulated short-circuit detection circuits 13. The control circuit 11 is connected to the fault diagnosis control module 2 and receives test signals. The control circuit 11 is connected to the simulated open-circuit detection circuits 12 and the simulated short-circuit detection circuits 13 to drive them. The simulated open-circuit detection circuits 12 are connected to the vehicle light controller 1002 and the tested light board 1001. The simulated short-circuit detection circuits 13 are connected to the vehicle light controller 1002.

[0045] Specifically, the number of simulated open-circuit detection circuits 12 and simulated short-circuit detection circuits 13 can be set according to actual needs. For example, they can be divided into simulated open-circuit detection circuits 12 and 13 for position light drive channels, simulated open-circuit detection circuits 12 and 13 for turn signal drive channels, simulated open-circuit detection circuits 12 and 13 for brake light drive channels, simulated open-circuit detection circuits 12 and 13 for NTC acquisition channels, and so on, for various light functions and acquisition channels.

[0046] The fault occurrence module 1 also includes: several voltage monitoring circuits 14 and several current monitoring circuits 15; the voltage monitoring circuit 14 is connected to the control circuit 11 and the vehicle lamp controller 1002, and is used to acquire the voltage signal of the vehicle lamp 100 under test and send it to the control circuit 11; the current monitoring circuit 15 is connected to the control circuit 11, the vehicle lamp controller 1002 and the lamp board 1001 under test, and is used to acquire the current signal of the vehicle lamp 100 under test and send it to the control circuit 11.

[0047] The fault diagnosis control module 2 includes a host computer 21 and a first CAN communication circuit 22 connected to each other; the fault occurrence module 1 also includes a second CAN communication circuit connected to the control circuit 11; the first CAN communication circuit 22 communicates with the second CAN communication circuit 16 to send voltage signals and current signals to the host computer 21; the first CAN communication circuit 22 communicates with the vehicle light controller 1002 to send fault diagnosis codes to the host computer 21.

[0048] like Figure 2As shown, the simulated open-circuit detection circuit 12 includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a first MOSFET Q1, a second MOSFET Q1, and a Zener diode Z1; the drive channel of the vehicle light controller 1002 is connected to the source of the second MOSFET Q1, and the drive channel of the vehicle light controller 1002 is connected to the gate of the second MOSFET Q1 through the third resistor R3; the Zener diode Z1, the second capacitor C2, and the third resistor R3 are connected in parallel; the drain of the second MOSFET Q2 is connected to the power supply input terminal of the lamp board 1001 under test, and the gate of the second MOSFET Q2 is connected to the source of the first MOSFET Q1 through the fourth resistor R4; the gate of the first MOSFET Q1 is connected to the control circuit 11 through the first resistor R1, the gate of the first MOSFET Q1 is grounded through the second resistor R2, the drain of the first MOSFET Q1 is grounded, and the first capacitor C1 and the second resistor R2 are connected in parallel. When the control circuit 11 sends a high-level signal, the first MOSFET Q1 turns on, causing the second MOSFET Q2 to turn on, so that the vehicle lamp controller 1002 and the lamp board under test 1001 are normally connected, and the driving channel of the vehicle lamp controller 1002 is in normal working condition; when the control circuit 11 sends a low-level signal, the first MOSFET Q1 turns off, causing the second MOSFET Q2 to turn off, so that the vehicle lamp controller 1002 and the lamp board under test 1001 are open circuit, and the driving channel of the vehicle lamp controller 1002 is in an open circuit state without load.

[0049] like Figure 3 As shown, the simulated short-circuit detection circuit 13 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3, and a third MOSFET Q1; the drive channel of the vehicle light controller 1002 is connected to the source of the third MOSFET Q3 through the fifth resistor R5, and the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all connected in parallel with the fifth resistor R5; the control circuit 11 is connected to the gate of the third MOSFET Q3 through the tenth resistor R10, and the control circuit 11 is connected to the drain of the third MOSFET Q3 through the tenth resistor R10 and the eleventh resistor R11. The drain of the third MOSFET Q3 is grounded, and the third capacitor C3 is connected in parallel with the eleventh resistor R11. When the control circuit 11 sends a high-level signal, the third MOSFET Q3 turns on, which has no effect on the headlight controller 1002. The headlight controller 1002 is in normal working condition. When the control circuit 11 sends a low-level signal, the third MOSFET Q3 turns off, the headlight controller 1002 is connected to GND, and the drive channel of the headlight controller 1002 is short-circuited to GND.

[0050] like Figure 4As shown, the voltage monitoring circuit 14 includes: a seventeenth resistor R17, a twelfth resistor R12, a thirteenth resistor R13, and a fourth capacitor C4; the vehicle light controller 1002 is connected to the control circuit 11 through the seventeenth resistor R17 and the twelfth resistor R12, and the vehicle light controller 1002 is grounded through the seventeenth resistor R17, the twelfth resistor R12, and the fourth capacitor C4, and the thirteenth resistor R13 and the fourth capacitor C4 are connected in parallel.

[0051] like Figure 5 As shown, the current monitoring circuit 15 includes: a current monitoring chip U1, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth capacitor C5, and a sixth capacitor C6. The control circuit 11 is connected to the first pin of the current monitoring chip U1. The second pin of the current monitoring chip U1 is connected to the first pin of the current monitoring chip U1 through the fourteenth resistor R14. The fifth capacitor C5 is connected in parallel with the fourteenth resistor R14. The second pin of the current monitoring chip U1 is grounded. The third pin of the current monitoring chip U1 is connected to the vehicle light controller 1002. The fourth pin of the current monitoring chip U1 is connected to the lamp board under test 1001. The third pin of the current monitoring chip U1 is connected to the fourth pin of the current monitoring chip U1 through the fifteenth resistor R15. The sixteenth resistor R16 is connected in parallel with the fifteenth resistor R15. The fifth pin of the current monitoring chip U1 is grounded through the sixth capacitor C6. The seventeenth resistor R17 and the thirteenth resistor R13 act as voltage dividers, and the twelfth resistor R12 acts as a current limiter.

[0052] The implementation process of this embodiment will be explained below with reference to specific implementation details:

[0053] like Figure 6 As shown, the test vehicle lights in this embodiment are divided into two types, and the difference between the two is that the composition of the test light board is different.

[0054] Type 1 of the lamp board under test: It is composed of LED light source, LED driver chip, DC-DC circuit and CAN communication circuit. The internal circuit of LED driver chip is responsible for controlling LED light source and fault diagnosis, and the CAN communication circuit is used to communicate lamp control actions and feedback fault information.

[0055] Type 2 of the tested lamp board: It is composed of LED light source, LED driver circuit, MCU control circuit, DCDC circuit and CAN communication circuit. The MCU works with the LED driver circuit to complete the lamp control action and read the fault status, and the CAN communication circuit is used to communicate the lamp control action and feedback fault information.

[0056] In practical use, the input and output terminals of the fault generation module 1 are connected to the vehicle lamp controller 1002 and the lamp board under test 1001, respectively. At this time, the input terminal of the fault generation module 1 is connected to the drive channel of the vehicle lamp controller 1002 (HCM / RCM), and the drive power is provided by the vehicle lamp controller 1002 (HCM / RCM). The output terminal of the fault generation module 1 is connected to the DC / DC circuit of the lamp board under test 1001 to provide drive power to the lamp board under test 1001.

[0057] Assuming that when the simulated open-circuit detection circuit 12 is working, the corresponding output terminal n will be in an open-circuit state with the input terminal n, so that the driving power supply cannot reach the output terminal n from the input terminal n, thereby realizing the simulation of the open circuit of the driving channel.

[0058] Assuming that when the simulated short-circuit detection circuit 13n is working, the voltage at the corresponding input terminal n will be grounded and pulled down to 0V, preventing the drive power supply from reaching the output terminal n from the input terminal n, thus simulating a short circuit in the drive channel.

[0059] After the test headlight 100 is intervened by the fault occurrence module 1, the headlight controller (HCM, RCM) sends a fault diagnosis code to the fault diagnosis control module 2 via the CAN bus. After the fault diagnosis control module 2 receives the fault diagnosis code through the first CAN communication circuit 22, the operator judges the current simulated fault phenomenon and obtains the test result of whether the headlight correctly reports the corresponding fault code.

[0060] Meanwhile, after receiving the test signal from the fault diagnosis control module, the fault occurrence module executes the corresponding simulated fault action signal and obtains the channel voltage and current values ​​used, feeding them back to the fault diagnosis control module. Testers can read the voltage and current values ​​through the human-machine interface to determine the current working environment of the vehicle lamp under test. For example, after receiving the test signal of open circuit in the position lamp drive channel, the fault occurrence module performs the open circuit action on the position lamp drive channel of the vehicle lamp under test and feeds back the voltage and current of the position lamp drive channel to the fault diagnosis control module.

[0061] This embodiment includes a simulated open-circuit detection circuit and a simulated short-circuit detection circuit connected in series between the lamp board under test and the lamp controller. These circuits simulate open-circuit and short-circuit signals and return fault diagnosis codes to the fault diagnosis control module based on the lamp under test. Operators can then use these fault diagnosis codes to determine whether the lamp under test can correctly detect faults. This method is simple to operate and can improve the accuracy of lamp detection.

[0062] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vehicle headlight fault diagnosis system, characterized in that, The method comprises the following steps: The fault diagnosis control module is used for sending a test signal; The fault occurrence module is connected with the fault diagnosis control module, and generates an analog fault action signal according to the test signal; The measured vehicle lamp is connected with the fault occurrence module, and detects the analog fault action signal and generates a fault diagnosis code; The fault diagnosis control module is also connected with the measured vehicle lamp, and is used for receiving the fault diagnosis code. The measured vehicle lamp comprises a measured lamp panel and a vehicle lamp controller, and the fault occurrence module comprises a control circuit, a plurality of analog open circuit detection circuits and a plurality of analog short circuit detection circuits; 2. The vehicle lamp failure diagnosis system according to claim 1, characterized by The control circuit is connected with the fault diagnosis control module and receives the test signal; The control circuit is connected with the analog open circuit detection circuit and the analog short circuit detection circuit to drive the analog open circuit detection circuit and the analog short circuit detection circuit; The analog open circuit detection circuit is connected with the vehicle lamp controller and the measured lamp panel; The analog short circuit detection circuit is connected with the vehicle lamp controller. The fault occurrence module further comprises a plurality of voltage monitoring circuits and a plurality of current monitoring circuits; 3. The vehicle lamp failure diagnosis system according to claim 2, characterized by The voltage monitoring circuit is connected with the control circuit and the vehicle lamp controller, and is used for acquiring a voltage signal of the measured vehicle lamp and sending the voltage signal to the control circuit; The current monitoring circuit is connected with the control circuit, the vehicle lamp controller and the measured lamp panel, and is used for acquiring a current signal of the measured vehicle lamp and sending the current signal to the control circuit. The fault diagnosis control module comprises a host computer and a first CAN communication circuit connected with each other; the fault occurrence module further comprises a second CAN communication circuit connected with the control circuit; 4. The vehicle lamp failure diagnosis system according to claim 3, characterized by The first CAN communication circuit communicates with the second CAN communication circuit to send the voltage signal and the current signal to the host computer; The first CAN communication circuit communicates with the vehicle lamp controller to send the fault diagnosis code to the host computer. The analog open circuit detection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first MOS tube, a second MOS tube and a voltage stabilizing diode; 5. The vehicle lamp failure diagnosis system according to claim 2, characterized by The vehicle lamp controller is connected with the source of the second MOS tube, and the vehicle lamp controller is connected with the gate of the second MOS tube through the third resistor; the voltage stabilizing diode and the second capacitor are connected in parallel with the third resistor; the drain of the second MOS tube is connected with the measured lamp panel, and the gate of the second MOS tube is connected with the source of the first MOS tube through the fourth resistor; The gate of the first MOS tube is connected with the control circuit through the first resistor, the gate of the first MOS tube is grounded through the second resistor, the drain of the first MOS tube is grounded, and the first capacitor is connected in parallel with the second resistor. The analog short circuit detection circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor and a third MOS tube.

6. The vehicle lamp failure diagnosis system according to claim 2, characterized by ​ The car light controller is connected with the source of the third MOS tube through the fifth resistor, and the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor are arranged in parallel with the fifth resistor. The control circuit is connected with the gate of the third MOS tube through the tenth resistor, and the control circuit is connected with the drain of the third MOS tube through the tenth resistor and the eleventh resistor, the drain of the third MOS tube is grounded, and the third capacitor is arranged in parallel with the eleventh resistor.

7. The vehicle lamp failure diagnosis system according to claim 3, characterized by The voltage monitoring circuit comprises a seventeenth resistor, a twelfth resistor, a thirteenth resistor and a fourth capacitor. The car light controller is connected with the control circuit through the seventeenth resistor and the twelfth resistor, the car light controller is grounded through the seventeenth resistor, the twelfth resistor and the fourth capacitor, and the thirteenth resistor is arranged in parallel with the fourth capacitor.

8. The vehicle lamp failure diagnosis system according to claim 3, characterized by The current monitoring circuit comprises a current monitoring chip, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor and a sixth capacitor. The control circuit is connected with the first pin of the current monitoring chip, the second pin of the current monitoring chip is connected with the first pin of the current monitoring chip through the fourteenth resistor, and the fifth capacitor is arranged in parallel with the fourteenth resistor; and the second pin of the current monitoring chip is grounded. The third pin of the current monitoring chip is connected with the car light controller, the fourth pin of the current monitoring chip is connected with a measured lamp panel, the third pin of the current monitoring chip is connected with the fourth pin of the current monitoring chip through the fifteenth resistor, the sixteenth resistor is arranged in parallel with the fifteenth resistor, and the fifth pin of the current monitoring chip is grounded through the sixth capacitor.

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