Vehicle lamp fault diagnosis system and diagnosis method

Abstract

The invention discloses a vehicle lamp fault diagnosis system and diagnosis method. The vehicle lamp fault diagnosis system 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 invention, 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] The present invention relates to the field of vehicle lamps, and in particular to a vehicle lamp fault diagnosis system and a diagnosis method. Background Art

[0002] With the continuous improvement of automotive electronic functional safety, the degree of intelligence of automobile headlights is getting higher and higher, and the categories of headlight fault detection are also increasing. How to control the problem of headlight fault diagnosis has become a difficult problem that everyone is trying to overcome. At present, many headlight factories do not have a headlight test platform that can simulate the occurrence of faults, resulting in the omission of faults in finished products leaving the factory, causing customer complaints and major impacts. Summary of the invention

[0003] In order to overcome the above technical defects, the present invention provides a vehicle lamp fault diagnosis system and a diagnosis method, which can perform fault diagnosis on vehicle lamps.

[0004] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0005] A vehicle lamp fault diagnosis system comprises: a fault occurrence module and a fault diagnosis control module;

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

[0007] The fault generation module is connected to the fault diagnosis control module and generates a simulated fault action signal according to the test signal;

[0008] The vehicle lamp under test and the fault occurrence module, the vehicle lamp under test detects the simulated fault action signal and generates a fault diagnosis code;

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

[0010] As a further improvement of the present invention, the vehicle lamp under test comprises: a lamp board under test and a vehicle lamp controller, and the fault occurrence module comprises: a control circuit, a plurality of simulated open circuit detection circuits, and a plurality of simulated short circuit detection circuits;

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

[0012] The control circuit is connected to 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;

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

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

[0015] As a further improvement of the present invention, the fault occurrence module further includes: a plurality of voltage monitoring circuits, a plurality of current monitoring circuits;

[0016] The voltage monitoring circuit is connected to the control circuit and the lamp controller, and is used to obtain the voltage signal of the lamp 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 to be tested, and is used to obtain the current signal of the vehicle lamp to be tested and send it to the control circuit.

[0018] As a further improvement of the present invention, the fault diagnosis control module includes: a connected host computer and a first CAN communication circuit; the fault occurrence module also 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 light controller to send the fault diagnosis code to the host computer.

[0021] As a further improvement of the present invention, 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 transistor, a second MOS transistor, and a voltage regulator diode;

[0022] The vehicle light controller is connected to the source of the second MOS tube, and the vehicle light controller is connected to the gate of the second MOS tube through the third resistor, and the voltage stabilizing diode, the second capacitor and the third resistor are arranged in parallel; the drain of the second MOS tube is connected to the lamp board under test, and the gate of the second MOS tube is connected to the source of the first MOS tube through the fourth resistor;

[0023] The gate of the first MOS tube is connected to 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 arranged in parallel with the second resistor.

[0024] As a further improvement of the present invention, the simulated 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;

[0025] The vehicle light controller is connected to 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 all arranged in parallel with the fifth resistor;

[0026] The control circuit is connected to the gate of the third MOS tube through the tenth resistor, the control circuit is connected to 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.

[0027] As a further improvement of the present invention, the voltage monitoring circuit comprises: a seventeenth resistor, a twelfth resistor, a thirteenth resistor, and a fourth capacitor;

[0028] The vehicle light controller is connected to the control circuit through the seventeenth resistor and the twelfth resistor, the vehicle 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.

[0029] As a further improvement of the present invention, 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;

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

[0032] The present invention also provides a vehicle lamp fault diagnosis method, which is applied to the above vehicle lamp fault diagnosis system, and comprises the steps of:

[0033] Acquiring the test signal;

[0034] According to the test signal, controlling the analog open circuit detection circuit and the analog short circuit detection circuit;

[0035] Get the fault diagnosis code returned by the tested vehicle lamp;

[0036] Based on the fault diagnostic code and the test signal, it is determined whether the fault diagnostic code reported by the tested vehicle lamp is correct.

[0037] As a further improvement of the present invention, the present invention further comprises the steps of:

[0038] Obtain current signals and voltage signals of analog open circuit detection circuit and analog short circuit detection circuit.

[0039] Compared with the prior art, the present invention has the following beneficial effects: the present invention is provided with a fault diagnosis control module for sending a test signal, and by setting a fault sending module with the vehicle lamp under test, a simulated fault action is adopted to diagnose the vehicle lamp under test, and the vehicle lamp under test generates a fault diagnosis code based on the simulated fault action and sends it to the fault diagnosis control module. By comparing the test signal with the fault diagnosis code, it can be determined whether the vehicle lamp under test can correctly report the fault diagnosis code, thereby improving the accuracy of vehicle lamp detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0041] Figure 1 This is a schematic diagram of the overall structure of the vehicle light fault diagnosis system described in Example 1;

[0042] Figure 2 This is a schematic diagram of the structure of the analog open circuit detection circuit described in Example 1;

[0043] Figure 3 This is a schematic diagram of the structure of the simulated short-circuit detection circuit described in Example 1;

[0044] Figure 4 This is a schematic diagram of the structure of the voltage monitoring circuit described in Example 1;

[0045] Figure 5 This is a schematic diagram of the structure of the current monitoring circuit described in Example 1;

[0046] Figure 6 A schematic diagram of the connection between the vehicle lamp fault diagnosis system described in Example 1 and different types of vehicle lamps to be tested;

[0047] Figure 7 This is a working diagram of the fault occurrence module described in Example 1;

[0048] Figure 8 This is a working flow diagram of the fault diagnosis control module described in Example 1;

[0049] Fig. 9 This is a flow chart of the vehicle light fault diagnosis method described in Example 2.

[0050] Explanation of the accompanying drawings: 1. Fault occurrence module; 11. Control circuit; 12. Analog open circuit detection circuit; 13. Analog short circuit detection circuit; 14. Voltage monitoring circuit; 15. Current monitoring circuit; 16. Second CAN communication circuit communication; 2. Fault diagnosis control module; 21. Host computer; 22. First CAN communication circuit; 100. Tested headlight; 1001. Tested headlight board; 1002. Headlight controller. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] Example 1

[0053] This embodiment provides a vehicle lamp fault diagnosis system, such as Figure 1 As shown, it includes: a fault occurrence module 1 and a fault diagnosis control module 2; the fault diagnosis control module 2 is used to send a test signal; the fault occurrence module 1 is connected to the fault diagnosis control module 2, and generates a simulated fault action signal according to the test signal; the tested vehicle lamp 100 is connected to the fault occurrence module 1, and the tested vehicle lamp 100 detects the simulated fault action signal and generates a fault diagnosis code; the fault diagnosis control module 2 is also connected to the tested vehicle lamp 100, and is used to receive the fault diagnosis code through the UDS protocol.

[0054] The vehicle lamp 100 under test includes: a lamp board 1001 under test and a vehicle lamp controller 1002, and the fault occurrence module 1 includes: a control circuit 11, a plurality of simulated open circuit detection circuits 12, and a plurality of simulated short circuit detection circuits 13; the control circuit 11 is connected to the fault diagnosis control module 2 to receive a test signal; the control circuit 11 is connected to the simulated open circuit detection circuit 12 and the simulated short circuit detection circuit 13 to drive the simulated open circuit detection circuit 12 and the simulated short circuit detection circuit 13; the simulated open circuit detection circuit 12 is connected to the vehicle lamp controller 1002 and the lamp board 1001 under test; the simulated short circuit detection circuit 13 is connected to the vehicle lamp controller 1002.

[0055] Specifically, the number of analog open circuit detection circuits 12 and analog short circuit detection circuits 13 can be set according to actual needs, such as analog open circuit detection circuits 12 and analog short circuit detection circuits 13 for position light drive channels, analog open circuit detection circuits 12 and analog short circuit detection circuits 13 for turn light drive channels, analog open circuit detection circuits 12 and analog short circuit detection circuits 13 for brake light drive channels, analog open circuit detection circuits 12 and analog short circuit detection circuits 13 for NTC acquisition channels, and other analog open circuit detection circuits 12 and analog short circuit detection circuits 13 for various light functions and acquisition channels.

[0056] The fault occurrence module 1 also includes: a number of voltage monitoring circuits 14 and a number of current monitoring circuits 15; the voltage monitoring circuit 14 is connected to the control circuit 11 and the headlight controller 1002, and is used to obtain the voltage signal of the headlight 100 under test and send it to the control circuit 11; the current monitoring circuit 15 is connected to the control circuit 11, the headlight controller 1002, and the headlight board 1001 under test, and is used to obtain the current signal of the headlight 100 under test and send it to the control circuit 11.

[0057] The fault diagnosis control module 2 includes: a connected host computer 21 and a first CAN communication circuit 22; 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 headlight controller 1002 to send the fault diagnosis code to the host computer 21.

[0058] like Figure 2 As shown, the analog 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 MOS tube Q1, a second MOS tube Q1, and a voltage regulator diode Z1; the driving channel of the car light controller 1002 is connected to the source of the second MOS tube Q1, the driving channel of the car light controller 1002 is connected to the gate of the second MOS tube Q1 through the third resistor R3, and the voltage regulator diode Z1, the second capacitor C2 and the third resistor R3 are arranged in parallel; the drain of the second MOS tube Q2 is connected to the power supply input end of the lamp board 1001 under test, and the gate of the second MOS tube Q2 is connected to the source of the first MOS tube Q1 through the fourth resistor R4; the gate of the first MOS tube Q1 is connected to the control circuit 11 through the first resistor R1, the gate of the first MOS tube Q1 is grounded through the second resistor R2, the drain of the first MOS tube Q1 is grounded, and the first capacitor C1 and the second resistor R2 are arranged in parallel. When the control circuit 11 sends a high-level signal, the first MOS tube Q1 is turned on, causing the second MOS tube Q2 to be turned on, so that the car light controller 1002 and the light board 1001 under test are normally turned on, and the driving channel of the car light controller 1002 is in a normal working state; when the control circuit 11 sends a low-level signal, the first MOS tube Q1 is turned off, causing the second MOS tube Q2 to be turned off, so that the car light controller 1002 and the light board 1001 under test are open-circuited, and the driving channel of the car light controller 1002 is in an open-circuit state with no load.

[0059] like Figure 3As shown, the analog 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 MOS tube Q1; the driving channel of the vehicle light controller 1002 is connected to the source of the third MOS tube 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 arranged in parallel with the fifth resistor R5; the control circuit 11 is connected to the gate of the third MOS tube Q3 through the tenth resistor R10, and the control circuit 11 is connected to the drain of the third MOS tube Q3 through the tenth resistor R10 and the eleventh resistor R11, the drain of the third MOS tube Q3 is grounded, and the third capacitor C3 is arranged in parallel with the eleventh resistor R11. When the control circuit 11 sends a high level signal, the third MOS tube Q3 is turned on, which has no effect on the light controller 1002, and the light controller 1002 is in normal working state. When the control circuit 11 sends a low level signal, the third MOS tube Q3 is turned off, the light controller 1002 is connected to GND, and the driving channel of the light controller 1002 is short-circuited to GND.

[0060] like Figure 4 As 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 car light controller 1002 is connected to the control circuit 11 through the seventeenth resistor R17 and the twelfth resistor R12, the car light controller 1002 is grounded through the seventeenth resistor R17, the twelfth resistor R12, and the fourth capacitor C4, and the thirteenth resistor R13 is arranged in parallel with the fourth capacitor C4.

[0061] 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, and the fifth capacitor C5 is arranged 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 measured lamp board 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 arranged in parallel with the fifteenth resistor R15, and 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 play the role of voltage division, and the twelfth resistor R12 plays the role of current limiting.

[0062] Next, the implementation process of this embodiment is explained in conjunction with the specific implementation process, as follows:

[0063] like Figure 6 As shown, the vehicle lamps to be tested in this embodiment are divided into two types, and the difference between the two types is that the components of the lamp panels to be tested are different.

[0064] Type 1 of the tested light board: It is composed of LED light source, LED driver chip, DCDC circuit and CAN communication circuit. The internal circuit of the LED driver chip is responsible for controlling the LED light source and fault diagnosis, and the CAN communication circuit is used to communicate the light control action and feedback fault information.

[0065] Type 2 of the tested light board: It is composed of LED light source, LED drive circuit, MCU control circuit, DCDC circuit and CAN communication circuit. The MCU cooperates with the LED drive circuit to complete the light control action and fault status reading, and the light control action and feedback fault information are communicated through the CAN communication circuit.

[0066] During specific use, the input end and the output end of the fault module 1 are respectively connected to the headlight controller 1002 and the light board under test 1001. At this time, the input end of the fault module 1 is connected to the driving channel of the headlight controller 1002 (HCM / RCM), and the driving power is provided by the headlight controller 1002 (HCM / RCM). The output end of the fault module 1 is connected to the DC / DC circuit of the headlight board under test 1001 to provide driving power to the headlight board under test 1001.

[0067] Assuming that the analog 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 cannot reach the output terminal n from the input terminal n, thereby realizing the simulation of the driving channel open circuit.

[0068] Assuming that the simulated short-circuit detection circuit 13n is working, the voltage of the corresponding input terminal n will be grounded and pulled down to 0V, so that the driving power supply cannot reach the output terminal n from the input terminal n, thereby realizing the simulation of the driving channel short circuit.

[0069] After the tested headlight 100 is intervened by the fault generating module 1, the headlight controller 1002 (HCM, RCM) sends a fault diagnosis code to the fault diagnosis control module 2 through the CAN bus. After receiving the fault diagnosis code through the first CAN communication circuit 22, the fault diagnosis control module 2 judges the current simulated fault phenomenon, obtains the test result of whether the headlight correctly reports the corresponding fault code and displays it on the human-computer interaction interface of the host computer 21.

[0070] At the same time, 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 and feeds them back to the fault diagnosis control module. The tester can read the voltage and current values ​​through the human-computer interaction interface to determine the current working environment of the vehicle lamp under test; illustratively, after receiving the test signal that the position light drive channel is open, the fault occurrence module performs the position light drive channel open action on the vehicle lamp under test and feeds back the voltage and current of the position light drive channel to the fault diagnosis control module.

[0071] Specifically, the fault diagnosis control module will match the fault diagnosis code with the test signal sent by itself, determine whether the fault diagnosis code corresponds to the fault phenomenon, and finally display the result on the human-computer interaction interface of the host computer.

[0072] like Figure 7 As shown, the steps for the fault occurrence module 1 to implement the above functions are as follows:

[0073] Step 1, the control circuit 11 is powered on and initialized;

[0074] Step 2, initializing the configuration of the control circuit 11 and the configuration data required by the system;

[0075] Step 3, obtaining the corresponding channel current and voltage through the voltage monitoring circuit 14 and the current monitoring circuit 15 and storing them in RAM;

[0076] Step 4, detect whether a CAN message within the rules occurs. If a CAN message requesting to obtain current and voltage is received, the current current and voltage information is returned in the form of a CAN message; if an open / short circuit test signal is received, the value of the corresponding bit of the open / short circuit control array is set to 1; if a normal working recovery test signal is received, the value of the corresponding bit of the open / short circuit control array is set to 0;

[0077] Step 5, refresh the open / short circuit control array;

[0078] Step 6, traverse the open / short circuit control array, update the status of all open / short circuit control modules, and jump to step 3 to continue running after execution is completed.

[0079] like Figure 8 As shown, the steps for the fault diagnosis control module 2 to implement the above functions are as follows:

[0080] Step 1: Initialization and UI construction;

[0081] Step 2, connect the CAN analyzer and configure the correct baud rate;

[0082] Step 3, obtain the GUI button status of the upper computer human-machine interaction interface. If the button controlling the light function is triggered, enable the corresponding CAN matrix signal. If the button controlling the open / short circuit function is triggered, update the open / short circuit control array. If the button controlling the DTC diagnostic function is triggered, send a request for diagnostic service to obtain the current fault code of the headlight controller (HCM / RCM).

[0083] Step 4, sending a request to obtain a channel current and voltage signal to the fault occurrence module 2 to obtain a channel current value and a voltage value;

[0084] Step 5, sending a CAN matrix signal simulating the vehicle body to enable the headlight controller (HCM / RCM) to be normally controlled;

[0085] Step 6, sending the open / short circuit control array updated in step 3 to the fault occurrence module in the form of a CAN message;

[0086] Step 7, refresh the current value, voltage value obtained in step 4, the button status updated in step 3, and the current fault code to the UI interface for display, and jump to step 3 after execution.

[0087] This embodiment is provided with a simulated open circuit detection circuit and a simulated short circuit detection circuit which are connected in series between the lamp board under test and the lamp controller to simulate the open circuit signal and the short circuit signal, and based on the fault diagnosis code returned to the fault diagnosis control module by the lamp under test, it is judged whether the lamp under test can correctly work the fault diagnosis code. The operation is simple and can improve the accuracy of lamp detection.

[0088] Example 2

[0089] This embodiment provides a vehicle lamp fault diagnosis method, which is applied to the vehicle lamp fault diagnosis system in Embodiment 1. Fig. 9 As shown, the steps include:

[0090] S1, obtaining the test signal;

[0091] S2. Controlling the simulated open circuit detection circuit and the simulated short circuit detection circuit according to the test signal;

[0092] S3. Obtain the fault diagnosis code returned by the tested vehicle lamp, the current signal and the voltage signal of the simulated open circuit detection circuit and the simulated short circuit detection circuit.

[0093] S4. Determine whether the fault diagnostic code reported by the tested vehicle lamp is correct based on the fault diagnostic code and the test signal.

[0094] During specific use, the tester inputs the test signal through the human-computer interaction interface of the host computer, where the test signal includes: the type of vehicle lamp being tested and the test type, such as open circuit test of the position lamp drive channel, short circuit test of the position lamp drive channel, open circuit test of the turn signal drive channel, short circuit test of the turn signal drive channel, etc. The fault occurrence module reads the test signal, and reads the fault diagnosis code of the vehicle lamp being tested and the voltage and current values ​​of the channel used, and obtains the fault diagnosis code in advance to facilitate comparison with the fault diagnosis code obtained in subsequent tests. At the same time, observe whether the power supply of the drive channel is normal. In addition, the fault comparison table can be saved in advance to compare the fault diagnosis code and the test signal to obtain the test result.

[0095] The fault occurrence module performs corresponding actions according to the test signal, obtains the voltage and current values ​​of the used channel and feeds them back to the host computer. When the tested vehicle lamp detects a fault, the fault diagnosis code is fed back to the host computer through the CAN bus.

[0096] After receiving the fault diagnosis code, the fault diagnosis control module judges the current simulated fault phenomenon, obtains the test result of whether the tested vehicle lamp correctly reports the corresponding fault diagnosis code, and displays it on the upper computer human-computer interaction interface.

[0097] For other implementation processes of this embodiment, please refer to Embodiment 1, which will not be described in detail here.

[0098] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A vehicle lamp fault diagnosis system, characterized in that: include: A fault occurrence module and a fault diagnosis control module; The fault diagnosis control module is used to send a test signal; The fault generation module is connected to the fault diagnosis control module and generates a simulated fault action signal according to the test signal; The vehicle lamp under test and the fault occurrence module, the vehicle lamp under test detects the simulated fault action signal and generates a fault diagnosis code; The fault diagnosis control module is also connected to the vehicle lamp under test and is used to receive the fault diagnosis code.

2. The vehicle lamp fault diagnosis system according to claim 1, characterized in that: 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, a plurality of simulated open circuit detection circuits, and a plurality of simulated short circuit detection circuits; The control circuit is connected to the fault diagnosis control module to receive the test signal; The control circuit is connected to 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 simulated open circuit detection circuit is connected to the vehicle light controller and the lamp board under test; The simulated short circuit detection circuit is connected to the vehicle light controller.

3. The vehicle lamp fault diagnosis system according to claim 2, characterized in that: The fault occurrence module also includes: a number of voltage monitoring circuits and a number of current monitoring circuits; The voltage monitoring circuit is connected to the control circuit and the lamp controller, and is used to obtain the voltage signal of the lamp under test and send it to the control circuit; The current monitoring circuit is connected to the control circuit, the vehicle lamp controller and the lamp board to be tested, and is used to obtain the current signal of the vehicle lamp to be tested and send it to the control circuit.

4. The vehicle lamp fault diagnosis system according to claim 2, characterized in that: The fault diagnosis control module includes: a connected host computer and a first CAN communication circuit; the fault occurrence module also includes: a second CAN communication circuit connected to the control circuit; 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 light controller to send the fault diagnosis code to the host computer.

5. The vehicle lamp fault diagnosis system according to claim 2, characterized in that: 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 transistor, a second MOS transistor, and a voltage regulator diode; The vehicle light controller is connected to the source of the second MOS tube, and the vehicle light controller is connected to the gate of the second MOS tube through the third resistor, and the voltage stabilizing diode, the second capacitor and the third resistor are arranged in parallel; the drain of the second MOS tube is connected to the lamp board under test, and the gate of the second MOS tube is connected to the source of the first MOS tube through the fourth resistor; The gate of the first MOS tube is connected to 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 arranged in parallel with the second resistor.

6. The vehicle lamp fault diagnosis system according to claim 2, characterized in that: The analog 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 MOS tube; The vehicle light controller is connected to 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 all arranged in parallel with the fifth resistor; The control circuit is connected to the gate of the third MOS tube through the tenth resistor, the control circuit is connected to 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 fault diagnosis system according to claim 2, characterized in that: The voltage monitoring circuit comprises: a seventeenth resistor, a twelfth resistor, a thirteenth resistor, and a fourth capacitor; The vehicle light controller is connected to the control circuit through the seventeenth resistor and the twelfth resistor, the vehicle 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 fault diagnosis system according to claim 2, characterized in that: 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 to the first pin of the current monitoring chip, 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 arranged in parallel with the fourteenth resistor; the second pin of the current monitoring chip is grounded; 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 arranged in parallel with the fifteenth resistor, and the fifth pin of the current monitoring chip is grounded through the sixth capacitor.

9. A vehicle lamp fault diagnosis method, characterized in that: The vehicle light fault diagnosis system according to any one of claims 1 to 8 comprises the steps of: Acquiring the test signal; According to the test signal, controlling the analog open circuit detection circuit and the analog short circuit detection circuit; Get the fault diagnosis code returned by the tested vehicle lamp; Based on the fault diagnostic code and the test signal, it is determined whether the fault diagnostic code reported by the tested vehicle lamp is correct.

10. The diagnostic method according to claim 9, characterized in that Also includes the steps: Obtain current signals and voltage signals of analog open circuit detection circuit and analog short circuit detection circuit.

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