A vehicle light detection device and detection method based on CAN bus control

Abstract

The present invention provides a headlight detection device and a detection method based on CAN bus control, which relates to the field of automated detection technology, including a main controller, a CAN message sending module, a CAN message parsing module, a current acquisition module, a voltage acquisition module, a power module, a camera module, an alarm module, a display, a headlight controller, and a headlight. The headlight controller is controlled by CAN messages to light up different functions of the headlight, and the headlight current, feedback voltage, and headlight lighting state photos are detected in real time. The DTC fault code fed back by the headlight controller is parsed, and the headlight current, feedback voltage, headlight lighting state photos, fault code information, and other judgment results are displayed on the display. The present invention can drive the CAN bus to control the headlight, and has the advantages of fast response speed, strong real-time performance, and high detection accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic detection, and in particular relates to a vehicle light detection device and a detection method thereof based on CAN bus control. Background Art

[0002] With the rapid development of the automotive electronics industry, car lights are also constantly upgraded with the development of modern technology. More and more car lights are driven by the CAN bus instead of the previous direct power supply control. People have higher and higher requirements for car safety, and as a result, the detection of CAN bus controlled car lights is becoming more and more important.

[0003] The lights controlled by the CAN bus require specified CAN message information to perform the corresponding light functions; when the lights fail, the CAN-controlled light driver will output a DTC fault code, but the current conventional detection methods are unable to drive the CAN-controlled lights and identify the DTC fault code. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] The purpose of the present invention is to provide a headlight detection device and a detection method based on CAN bus control, which can drive the CAN bus to control the headlight, detect the headlight current, feedback voltage, and headlight lighting status photos in real time, analyze the DTC fault code feedback from the headlight controller, and display the detection results and fault code information on a display.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A headlight detection device based on CAN bus control, comprising a main controller, a CAN message sending module, a CAN message parsing module, a current acquisition module, a voltage acquisition module, a power module, a camera module, an alarm module, a display, a headlight controller, and a headlight; the power module is connected to the main controller, the CAN message sending module, the CAN message parsing module, the current acquisition module, the voltage acquisition module, and the camera module to provide a stable power supply voltage for each module; the CAN message sending module is connected to the headlight controller to control the headlight controller to perform a specified headlight function; the CAN message parsing module is connected to the headlight controller to receive message information fed back by the headlight controller and feed it back to the main controller; the headlight controller is connected to the headlight to control the headlight The lamp performs related functions; the current acquisition module is connected to the lamp, collects the lamp current value and sends it to the main controller; the voltage acquisition module is connected to the lamp, collects the lamp feedback terminal voltage and sends it to the main controller; the camera module is connected to the main controller, collects the real-time image of the lamp when it is lit and sends it to the main controller; the main controller is connected to the CAN message sending module, the CAN message parsing module, the current acquisition module, the voltage acquisition module, the camera module, the alarm module, and the display, controls the CAN message sending module to send the specified message information, controls the camera module to collect the lamp lighting image, analyzes and judges, analyzes the message information fed back by the CAN message parsing module, controls the alarm module to issue an audible and visual alarm prompt, outputs the test results, and analyzes the results to the display interface.

[0009] According to one embodiment of the present invention, the power supply module includes a 5V voltage regulator module and a 10V voltage regulator module, wherein the 5V module includes: an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1, the input terminal H2 is connected to the input power supply, the 1st pin of the input terminal H2 is connected to the anode of the diode D1 and the cathode of the voltage regulator T1, and the 2nd pin of the input terminal H2 and the anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and the 1st pin of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and the 2nd pin of the three-terminal voltage regulator U1 are grounded, the 3rd pin of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.

[0010] According to one embodiment of the present invention, the power supply module includes a 5V voltage stabilizing module and a 10V voltage stabilizing module, wherein the 10V module includes: capacitors C8, C9, a voltage stabilizing block U5, resistors R29, R30, an input power supply +13.5V is connected to one end of capacitor C8, and the other end of capacitor C8 is grounded. At the same time, the input power supply +13.5V is connected to the Vin end of U5, and the Vout output power supply of U5 is +10V, and is connected to resistor R29. The other end of resistor R29 is connected to Adj of U5, and is connected to one end of resistor R30. The other end of resistor R30 is grounded, one end of capacitor C9 is grounded, and the other end is connected to the output power supply +10V.

[0011] According to an embodiment of the present invention, the diode D1 is an ISMB28CAT3 anti-reverse connection diode; and the three-terminal voltage regulator U1 is an LM2940S low voltage drop three-terminal voltage regulator chip.

[0012] According to one embodiment of the present invention, the current acquisition module includes: resistors R15, R16, R17, R18, R19, R3, R26, R27, R28, R4, capacitors C10, C6, C7, a voltage regulator D2, and operational amplifiers U3A and U3B; the sampling TEST end is connected to one end of the resistor R15, the capacitor C10, and the resistor R17, the other end of the resistor R15 is grounded, the other end of the capacitor C10 is grounded, one end of the resistor R16 is grounded, the other end of the resistor R16 is connected to the 2-pin input end of U3A, the other end of the resistor R17, one end of the resistor R19, and the 3-pin input end of U3A, and the other end of the resistor R19 is connected to the power supply +5V; the 8-pin of U3A is connected to the power supply +10V, and the 4-pin is grounded , the output terminal 1 pin is connected to one end of the capacitor C6, and the other end of the capacitor C6 is grounded, the two ends of the resistor R18 are respectively connected to the 2 pin and the 1 pin of U3A, the output terminal 1 pin of U3A is connected to one end of the resistor R3, the other end of the resistor R3 and one end of the resistor R28 are connected to the input terminal 5 pin of U3B, and the other end of the resistor R28 is grounded; the power supply +5V is connected to one end of the resistor R26, the other end of the resistor R26 and one end of the resistor R27 are connected to the cathode of the Zener diode D2, and the other end of the Zener diode D2 is grounded, the other end of the resistor R27 and one end of the resistor R4 are connected to the input terminal 6 pin of U3B, the other end of the resistor R4 is connected to the output terminal 7 pin of U3B, one end of the capacitor C7 is grounded, and the other end of the capacitor C7 is connected to the 7 pin of U3B.

[0013] A vehicle light detection method based on CAN bus control comprises the following steps:

[0014] S1, the main controller controls the CAN message sending module to send the specified CAN message information to the headlight controller, and the headlight controller controls the headlight to perform the corresponding function after receiving the CAN message;

[0015] S2, the main controller controls the camera acquisition module to collect images of the lights on in real time, compares the collected images with the standard images in the program, determines whether they are within the specified error range, and sends the determination result to the display;

[0016] S3, the main controller controls the current acquisition module to collect the current when the lamp is on in real time, compares the collected current value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display;

[0017] S4, the main controller controls the voltage acquisition module to collect the voltage of the feedback terminal when the lamp is on in real time, compares the collected voltage value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display;

[0018] S5, the main controller controls the CAN message parsing module to receive the message information fed back by the headlight controller, analyzes whether there is a DTC fault code in the fed back message, performs a table lookup in the program, and sends the interpretation of the DTC fault code to the display;

[0019] S6. The main controller judges the lamp image, current, feedback voltage, and DTC fault code fed back by the lamp driver. If all are qualified, it outputs an OK signal. If only one item is unqualified, it outputs an NG signal to the alarm module.

[0020] S7. The alarm module uses light and sound to alarm at the same time. When receiving an OK signal, the green light is on. When receiving an NG signal, the red light is on and there is a sound alarm prompt.

[0021] (III) Beneficial effects

[0022] The beneficial effects of the present invention include: a headlight detection device and a detection method based on CAN bus control, which controls the headlight controller to light up different functions of the headlight through CAN messages, detects the headlight current, feedback voltage, and headlight lighting status photos in real time, analyzes the DTC fault code fed back by the headlight controller, and displays the judgment results such as the headlight current, feedback voltage, headlight lighting status photos, fault code information, etc. on a display. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a principle block diagram of the detection device of the present invention;

[0025] Figure 2 This is the circuit schematic diagram of the 5V voltage regulator module of the power module;

[0026] Figure 3 This is the circuit schematic diagram of the 10V voltage regulator module of the power module;

[0027] Figure 4 This is the circuit schematic diagram of the current acquisition module;

[0028] Figure 5 It is a flow chart of the detection method of the present invention.

[0029] Description of reference numerals:

[0030] 1. Main controller; 2. Power module; 3. CAN message sending module; 4. Headlight controller; 5. CAN message parsing module; 6. Camera module; 7. Voltage acquisition module; 8. Current acquisition module; 9. Display; 10. Alarm module; 11. Headlight. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Combination Figure 1A headlight detection device based on CAN bus control includes a main controller 1, a CAN message sending module 3, a CAN message parsing module 5, a current acquisition module 8, a voltage acquisition module 7, a power module 2, a camera module 6, an alarm module 10, a display 9, a headlight controller 4, and a headlight 11. The power module 2 is connected to the main controller 1, the CAN message sending module 3, the CAN message parsing module 5, the current acquisition module 8, the voltage acquisition module 7, and the camera module 6 to provide a stable power supply voltage for each module; the CAN message sending module 3 is connected to the headlight controller 4 to control the headlight controller 4 to perform a specified headlight 11 function; the CAN message parsing module 5 is connected to the headlight controller 4 to receive the message information fed back by the headlight controller 4 and feed it back to the main controller 1; the headlight controller 4 is connected to the headlight 11 to control the headlight 11 to perform related functions; the current acquisition module 8 is connected to the headlight 11 to collect the current value of the headlight 11 and send it to the main controller 1; the voltage acquisition module 7 It is connected to the car light 11, collects the voltage at the feedback end of the car light 11 and sends it to the main controller 1; the camera module 6 is connected to the main controller 1, collects the image of the car light 11 when it is lit in real time and sends it to the main controller 1; the main controller 1 is connected to the CAN message sending module 3, the CAN message parsing module 4, the current acquisition module 8, the voltage acquisition module 7, the camera module 6, the alarm module 10, and the display 9, controls the CAN message sending module 3 to send the specified message information, controls the camera module 6 to collect the image of the car light 11 when it is lit, analyzes and judges the message information fed back by the CAN message parsing module 5, controls the alarm module 10 to issue an audible and visual alarm prompt, and outputs the test results and analysis results to the display 9 interface.

[0033] Combination Figure 2 The power supply 5V voltage regulator module includes: an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1. The input terminal H2 is connected to the input power supply, and pin 1 of the input terminal H2 is connected to the anode of the diode D1 and the cathode of the voltage regulator T1. Pin 2 of the input terminal H2 and the anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and pin 1 of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and pin 2 of the three-terminal voltage regulator U1 are grounded, and pin 3 of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.

[0034] The diode D1 adopts ISMB28CAT3 anti-reverse connection diode to prevent short circuit caused by reverse connection of the power supply at the input end of the power module 1; the three-terminal voltage regulator U1 adopts LM2940S low voltage difference three-terminal voltage regulator chip, which can convert the input end 10~20V voltage into 5V voltage, and the overvoltage protection function is activated when the input end voltage is greater than 30V, and the output voltage becomes 0V.

[0035] Combination Figure 3 The power supply 10V voltage regulator module includes: capacitors C8, C9, voltage regulator block U5, resistors R29, R30, the input power supply +13.5V is connected to one end of capacitor C8, and the other end of capacitor C8 is grounded. At the same time, the input power supply +13.5V is connected to the Vin end of U5, and the Vout output power supply of U5 is +10V, and is connected to resistor R29. The other end of resistor R29 is connected to Adj of U5 and connected to one end of resistor R30. The other end of resistor R30 is grounded, one end of capacitor C9 is grounded, and the other end is connected to the output power supply +10V.

[0036] Combination Figure 4 The current acquisition module includes: resistors R15, R16, R17, R18, R19, R3, R26, R27, R28, R4, capacitors C10, C6, C7, voltage regulator D2, operational amplifiers U3A, U3B; the sampling TEST end is connected to the resistor R15, capacitor C10, and one end of the resistor R17, the other end of the resistor R15 is grounded, the other end of the capacitor C10 is grounded, one end of the resistor R16 is grounded, the other end of the resistor R16 is connected to the 2-pin input end of U3A, the other end of the resistor R17 and one end of the resistor R19 are connected to the 3-pin input end of U3A, and the other end of the resistor R19 is connected to the power supply +5V; the 8-pin of U3A is connected to the power supply +10V, the 4-pin is grounded, and the output end 1 is connected to the 2-pin input end of U3A. The first foot is connected to one end of capacitor C6, the other end of capacitor C6 is grounded, the two ends of resistor R18 are respectively connected to pin 2 and pin 1 of U3A, pin 1 of output terminal of U3A is connected to one end of resistor R3, the other end of resistor R3 and one end of resistor R28 are connected to pin 5 of input terminal of U3B, and the other end of resistor R28 is grounded; the power supply +5V is connected to one end of resistor R26, the other end of resistor R26 and one end of resistor R27 are connected to the cathode of Zener diode D2, the other end of Zener diode D2 is grounded, the other end of resistor R27 and one end of resistor R4 are connected to pin 6 of input terminal of U3B, the other end of resistor R4 is connected to pin 7 of output terminal of U3B, one end of capacitor C7 is grounded, and the other end of capacitor C7 is connected to pin 7 of U3B.

[0037] Combination process Figure 5 , a vehicle light detection method based on CAN bus control, comprising the following steps:

[0038] S1, the main controller controls the CAN message sending module to send the specified CAN message information to the headlight controller, and the headlight controller controls the headlight to perform the corresponding function after receiving the CAN message;

[0039] S2, the main controller controls the camera acquisition module to collect images of the lights on in real time, compares the collected images with the standard images in the program, determines whether they are within the specified error range, and sends the determination result to the display;

[0040] S3, the main controller controls the current acquisition module to collect the current when the lamp is on in real time, compares the collected current value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display;

[0041] S4, the main controller controls the voltage acquisition module to collect the voltage of the feedback terminal when the lamp is on in real time, compares the collected voltage value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display;

[0042] S5, the main controller controls the CAN message parsing module to receive the message information fed back by the headlight controller, analyzes whether there is a DTC fault code in the fed back message, performs a table lookup in the program, and sends the interpretation of the DTC fault code to the display;

[0043] S6. The main controller judges the lamp image, current, feedback voltage, and DTC fault code fed back by the lamp driver. If all are qualified, it outputs an OK signal. If only one item is unqualified, it outputs an NG signal to the alarm module.

[0044] S7. The alarm module uses light and sound to alarm at the same time. When receiving an OK signal, the green light is on. When receiving an NG signal, the red light is on and there is a sound alarm prompt.

[0045] In summary, the embodiments of the present invention are a headlight detection device and a detection method based on CAN bus control, which control the headlight controller to light up different functions of the headlight through CAN messages, detect the headlight current, feedback voltage, and headlight lighting status photos in real time, analyze the DTC fault code fed back by the headlight controller, and display the judgment results such as headlight current, feedback voltage, headlight lighting status photos, fault code information, etc. on a display.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle light detection method based on CAN bus control, characterized in that: The vehicle light detection method uses a vehicle light detection device for detection, and the vehicle light detection device includes a main controller, a CAN message sending module, a CAN message parsing module, a current acquisition module, a voltage acquisition module, a power supply module, a camera module, an alarm module, a display, a vehicle light controller, and a vehicle light; The power supply module is connected to the main controller, the CAN message sending module, the CAN message parsing module, the current acquisition module, the voltage acquisition module, and the camera module to provide a stable power supply voltage for each module; The CAN message sending module is connected to the headlight controller to control the headlight controller to perform a specified headlight function; The CAN message parsing module is connected to the headlight controller, receives the message information fed back by the headlight controller, and feeds it back to the main controller; the headlight controller is connected to the headlight, and controls the headlight to perform related functions; The current acquisition module is connected to the headlight, collects the headlight current value and sends it to the main controller; the voltage acquisition module is connected to the headlight, collects the headlight feedback terminal voltage and sends it to the main controller; The camera module is connected to the main controller, and collects images of the lights on in real time and sends them to the main controller; the main controller is connected to the CAN message sending module, the CAN message parsing module, the current acquisition module, the voltage acquisition module, the camera module, the alarm module, and the display, and controls the CAN message sending module to send the specified message information, controls the camera module to collect images of the lights on, analyzes and judges, analyzes the message information fed back by the CAN message parsing module, controls the alarm module to give sound and light alarm prompts, outputs the test results, and analyzes the results to the display interface; The vehicle light detection method comprises the following steps: S1, the main controller controls the CAN message sending module to send the specified CAN message information to the headlight controller, and the headlight controller controls the headlight to perform the corresponding function after receiving the CAN message; S2, the main controller controls the camera acquisition module to collect images of the lights on in real time, compares the collected images with the standard images in the program, determines whether they are within the specified error range, and sends the determination result to the display; S3, the main controller controls the current acquisition module to collect the current when the lamp is on in real time, compares the collected current value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display; S4, the main controller controls the voltage acquisition module to collect the voltage of the feedback terminal when the lamp is on in real time, compares the collected voltage value with the standard value in the program, determines whether it is within the specified error range, and sends the determination result to the display; S5, the main controller controls the CAN message parsing module to receive the message information fed back by the headlight controller, analyzes whether there is a DTC fault code in the fed back message, performs a table lookup in the program, and sends the interpretation of the DTC fault code to the display; S6. The main controller judges the lamp image, current, feedback voltage, and DTC fault code fed back by the lamp driver. If all are qualified, it outputs an OK signal. If only one item is unqualified, it outputs an NG signal to the alarm module. S7. The alarm module uses light and sound to alarm at the same time. When receiving an OK signal, the green light is on. When receiving an NG signal, the red light is on and there is a sound alarm prompt.

2. A vehicle light detection method based on CAN bus control as claimed in claim 1, characterized in that: The power supply module includes a 5V voltage regulator module and a 10V voltage regulator module, wherein the 5V module includes: an input terminal H2, a diode D1, a voltage regulator T1, capacitors C1, C2, C3, C4, and a three-terminal voltage regulator U1, the input terminal H2 is connected to the input power supply, pin 1 of the input terminal H2 is connected to the anode of the diode D1 and the cathode of the voltage regulator T1, and pin 2 of the input terminal H2 and the anode of the voltage regulator T1 are grounded; the cathode of the diode D1 is connected to one end of the capacitor C1, one end of the capacitor C2, and pin 1 of the three-terminal voltage regulator U1, the other end of the capacitor C1, the other end of the capacitor C2, and pin 2 of the three-terminal voltage regulator U1 are grounded, pin 3 of the three-terminal voltage regulator U1 is connected to one end of the capacitor C3 and one end of the capacitor C4 and outputs a +5V power supply, and the other end of the capacitor C3 and the other end of the capacitor C4 are grounded.

3. A vehicle light detection method based on CAN bus control as claimed in claim 2, characterized in that: The power supply module includes a 5V voltage stabilizing module and a 10V voltage stabilizing module, wherein the 10V module includes: capacitors C8, C9, a voltage stabilizing block U5, resistors R29, R30, an input power supply +13.5V is connected to one end of capacitor C8, and the other end of capacitor C8 is grounded, while the input power supply +13.5V is connected to the Vin end of U5, the Vout output power supply of U5 is +10V, and is connected to resistor R29, the other end of resistor R29 is connected to Adj of U5, and is connected to one end of resistor R30, the other end of resistor R30 is grounded, one end of capacitor C9 is grounded, and the other end is connected to the output power supply +10V.

4. A vehicle light detection method based on CAN bus control as claimed in claim 2, characterized in that: The diode D1 adopts ISMB28CAT3 anti-reverse connection diode; the three-terminal voltage regulator U1 adopts LM2940S low voltage difference three-terminal voltage regulator chip.

5. The vehicle light detection method based on CAN bus control as claimed in claim 1, characterized in that: The current acquisition module includes: resistors R15, R16, R17, R18, R19, R3, R26, R27, R28, R4, capacitors C10, C6, C7, voltage regulator D2, operational amplifiers U3A, U3B; the sampling TEST end is connected to the resistor R15, the capacitor C10, and one end of the resistor R17, the other end of the resistor R15 is grounded, the other end of the capacitor C10 is grounded, one end of the resistor R16 is grounded, the other end of the resistor R16 is connected to the 2-pin input end of U3A, the other end of the resistor R17 and one end of the resistor R19 are connected to the 3-pin input end of U3A, and the other end of the resistor R19 is connected to the power supply +5V; the 8-pin of U3A is connected to the power supply +10V, the 4-pin is grounded, and the output end 1 The pin is connected to one end of capacitor C6, and the other end of capacitor C6 is grounded. The two ends of resistor R18 are respectively connected to pin 2 and pin 1 of U3A. Pin 1 of the output end of U3A is connected to one end of resistor R3. The other end of resistor R3 and one end of resistor R28 are connected to pin 5 of the input end of U3B, and the other end of resistor R28 is grounded. The power supply +5V is connected to one end of resistor R26, the other end of resistor R26 and one end of resistor R27 are connected to the cathode of Zener diode D2, and the other end of Zener diode D2 is grounded. The other end of resistor R27 and one end of resistor R4 are connected to pin 6 of the input end of U3B. The other end of resistor R4 is connected to pin 7 of the output end of U3B. One end of capacitor C7 is grounded, and the other end of capacitor C7 is connected to pin 7 of U3B.

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