System and method for vehicle lamp fault detection

Abstract

The invention provides a system for vehicle lamp fault detection and a control method, and belongs to the technical field of vehicle lamp fault detection.The system comprises a vehicle lamp, an instrument panel, a fault detection module and a main control module, the vehicle lamp is connected with the fault detection module, and the output end of the fault detection module is connected with the input end of the main control module; the output end of the main control module is connected with the input end of the vehicle lamp and the input end of the instrument panel. The fault detection module detects the current flowing through the vehicle lamp through a current detection line, and when the current flowing through the vehicle lamp is continuously lower than a vehicle lamp current abnormal threshold for multiple times, the fault detection module outputs a fault feedback signal to the main control module. After the main control module judges that the automobile lamp breaks down, the main control module controls the automobile lamp and the instrument panel to give an alarm. The automobile lamp damage condition is accurately fed back, the error feedback risk caused by the low-voltage or low-temperature environment is reduced, meanwhile, a driver is reminded when a fault occurs, and safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle lamp fault detection, and in particular, relates to a system and a control method for vehicle lamp fault detection. Background Art

[0002] Vehicle turn signals are lights used to indicate to other road users that the vehicle will turn right or left, and they play a vital role in vehicle driving. However, when their function fails, the driver has no way of knowing and assumes that their function is normal, which can easily lead to traffic accidents.

[0003] Chinese patent CN220156691U provides a vehicle lamp fault diagnosis feedback circuit, including several parallel-connected LED power supply circuits, each of which is connected in series with a transistor constant current circuit for monitoring whether the vehicle lamp is faulty. A diagnostic feedback circuit is connected in series between the output end of the transistor constant current circuit and the main control MCU, and the diagnostic feedback circuit is used to stably transmit the monitoring signal.

[0004] In the prior art, since the voltage at the collector position varies with the input voltage or the headlight voltage, when the input voltage decreases or the headlight voltage increases, the voltage at the collector position of the transistor decreases. When it is lower than the detection threshold, false feedback may occur. Summary of the Invention

[0005] The present invention aims to provide a system and control method for detecting vehicle lamp faults, so as to achieve the technical purpose of more accurately feeding back the damage status of vehicle lamps and reducing the probability of false triggering.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides a system for detecting vehicle lamp faults, comprising a vehicle lamp, an instrument panel, a fault detection module and a main control module. The vehicle lamp is connected to the fault detection module, the output end of the fault detection module is connected to the input end of the main control module, the output end of the main control module is connected to the input end of the vehicle lamp, and the output end of the main control module is connected to the input end of the instrument panel.

[0008] The fault detection module is used to perform fault detection on the vehicle lights. The fault detection module outputs a fault feedback signal to the main control module. The main control module outputs a control instruction to the vehicle lights. The main control module outputs a control instruction to the instrument panel.

[0009] The fault detection module includes a headlight driver chip, a transistor, a diode and a first resistor.

[0010] The headlight driver chip is connected to the headlight through a current detection line, the output end of the headlight driver chip is connected to the base of the transistor, the emitter of the transistor is grounded through a first resistor, the collector of the transistor is connected to the negative electrode of the diode, and the positive electrode of the diode is connected to the fault feedback point.

[0011] The main control module adopts a domain controller.

[0012] The fault feedback point is connected to the input end of the domain controller through a second resistor, and the fault feedback point is connected to the power supply through a third resistor.

[0013] The present invention provides a method for detecting vehicle lamp failure:

[0014] Step 1: The fault detection module detects the current flowing through the headlight through the current detection line. When the current flowing through the headlight is lower than the abnormal current threshold of the headlight for multiple consecutive times, the fault detection module outputs a fault feedback signal to the main control module;

[0015] Step 2: After the main control module determines that the headlights are faulty, the main control module controls the headlights to flash and issues a warning through the instrument panel.

[0016] In step 1, the main control module delays detection of the fault feedback signal after the vehicle light is powered on.

[0017] In step one, the headlight driver chip in the fault detection module is reset after the headlight is powered on, and a delay is performed to detect the current flowing through the headlight. When the current flowing through the headlight is lower than the abnormal current threshold of the headlight for multiple times, the headlight driver chip outputs an alarm signal to the base of the transistor, and the collector and emitter of the transistor are turned on.

[0018] After the collector and emitter of the transistor are turned on, the third resistor and the first resistor are connected in series to divide the voltage, and the main control module determines whether the headlight is faulty by detecting the potential of the fault feedback point.

[0019] The technical effects of the present invention are:

[0020] (1) The present invention detects vehicle lights in real time. When any of the left front turn signal, right front turn signal, left rear turn signal, or right rear turn signal fails, the system automatically triggers a double flash alarm for all vehicle lights. Simultaneously, the instrument panel's turn signal failure indicator flashes. This dual warning system of lights and instruments avoids potential safety issues when changing lanes or turning due to turn signal failure, significantly reducing the risk of accidents such as rear-end collisions and scrapes.

[0021] (2) This invention improves fault detection accuracy and reduces false positives. The fault detection module monitors the headlight current in real time through the headlight driver chip (S9S08DZ60). A fault is detected only when the current falls below the abnormal current threshold (0.3A) five times in a row. This strategy, combined with a delayed detection mechanism, effectively distinguishes normal startup current fluctuations from actual faults, avoiding false alarms caused by transient interference such as voltage surges and poor contact.

[0022] (3) The headlight driver chip in the present invention needs to make multiple judgments on the fault of the headlight, and the domain controller needs to make multiple judgments on the fault feedback signal, which reduces the risk of false feedback caused by low voltage or low temperature environment and reduces the probability of false triggering.

[0023] (4) The system of the present invention has high reliability and is adaptable to the vehicle environment. It adopts the S9S08DZ60 headlight driver chip, which has strong hardware anti-interference ability. The combination of NPN transistor, diode and voltage divider resistor forms a reliable signal feedback link to ensure the stability of fault signal transmission and adapt to vibration, temperature fluctuation and other working conditions in the vehicle environment.

[0024] (5) The dual-flash warning strategy of the present invention provides an intuitive reminder. When a fault occurs, all relevant lights flash synchronously. Compared with a single light alarm, the visual warning effect is more intense, especially in daytime or complex lighting conditions, and can effectively alert surrounding vehicles. The instrument panel logo flashes synchronously, complementing the light alarm, ensuring that the driver can quickly detect the fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] This manual includes the following drawings, which show the following contents:

[0026] Figure 1 This is a logical structure block diagram of a system and control method for vehicle lamp fault detection according to the present invention;

[0027] Figure 2 A circuit diagram of a system and control method for vehicle lamp fault detection according to the present invention;

[0028] Figure 1 The markings are: 1. Headlight; 2. Instrument panel; 3. Fault detection module; 4. Main control module. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0030] The present invention provides a system for detecting vehicle lamp faults, comprising a vehicle lamp 1, an instrument panel 2, a fault detection module 3, and a main control module 4. The vehicle lamp 1 is connected to the fault detection module 3, the output end of the fault detection module 3 is connected to the input end of the main control module 4, the output end of the main control module 4 is connected to the input end of the vehicle lamp 1, and the output end of the main control module 4 is connected to the input end of the instrument panel 2.

[0031] The fault detection module 3 is used to detect faults of the vehicle lamp 1 . The fault detection module 3 outputs a fault feedback signal to the main control module 4 . The main control module 4 outputs a control instruction to the vehicle lamp 1 . The main control module 4 outputs a control instruction to the instrument panel 2 .

[0032] Fault detection module 3 includes a headlight driver chip, a transistor, a diode, and a first resistor. The headlight driver chip is connected to headlight 1 via a current detection line. The output of the headlight driver chip is connected to the base of the transistor, the emitter of the transistor is grounded via a first resistor, the collector of the transistor is connected to the cathode of the diode, and the anode of the diode is connected to a fault feedback point. Main control module 4 utilizes a domain controller. The fault feedback point is connected to the input of the domain controller via a second resistor, and to the power supply via a third resistor.

[0033] The present invention provides a method for detecting vehicle lamp failure:

[0034] Step 1: The fault detection module 3 detects the current flowing through the headlight 1 through the current detection line. When the current flowing through the headlight 1 is lower than the abnormal current threshold of the headlight for multiple consecutive times, the fault detection module 3 outputs a fault feedback signal to the main control module 4;

[0035] Step 2: After the main control module 4 determines that the headlight 1 has a fault, the main control module 4 controls the headlight 1 to flash and issues a warning through the instrument panel 2.

[0036] In step 1, the main control module 4 delays detecting the fault feedback signal after the vehicle lamp 1 is powered on.

[0037] In step 1, the headlight driver chip in fault detection module 3 resets after lamp 1 is powered on. It then delays detecting the current flowing through lamp 1. If the current through lamp 1 repeatedly falls below the abnormal current threshold, the headlight driver chip outputs an alarm signal to the base of the transistor, turning on the collector and emitter of the transistor. After the transistor's collector and emitter are turned on, a third resistor is connected in series with the first resistor to divide the voltage. Main control module 4 then determines whether lamp 1 has a fault by detecting the potential at the fault feedback point.

[0038] The following describes in detail a system for detecting vehicle light faults according to the present invention, comprising a vehicle light 1, an instrument panel 2, a fault detection module 3, and a main control module 4. The present invention is used to detect whether a vehicle light 1 has failed and to issue a warning when a vehicle light 1 fails, thereby preventing damage to the vehicle light 1 from affecting driving safety. In an embodiment of the present invention, the vehicle lights 1 to be detected include a left front turn signal, a right front turn signal, a left rear turn signal, and a right rear turn signal. When a vehicle light 1 fails, the present invention controls all vehicle lights 1 to flash in a double-flashing alarm. The vehicle lights 1 used for the alarm include the left front turn signal, the right front turn signal, the left rear turn signal, the right rear turn signal, the left turn signal, and the right turn signal. When a vehicle light 1 fails, the turn signal fault indicator on the instrument panel 2 flashes in a synchronized manner to alert the driver that the vehicle light 1 has failed.

[0039] Fault detection module 3 is used to detect whether headlight 1 has a fault and transmit a fault feedback signal to main control module 4 via a fault feedback point. Fault detection module 3 includes a headlight driver chip, a transistor, a diode, and a first resistor. The headlight driver chip detects whether the current flowing through headlight 1 is below a current abnormality threshold. If the headlight driver chip repeatedly detects that the current flowing through headlight 1 is below the current abnormality threshold, it outputs an alarm signal to the transistor to control the collector and emitter of the transistor to conduct. After the collector and emitter of the transistor conduct, the first and third resistors are connected in series to divide the voltage, causing the potential at the fault feedback point to change. Main control module 4 then determines whether headlight 1 has a fault by detecting this potential change at the fault feedback point. In this embodiment of the present invention, the specific model of the headlight driver chip is S9S08DZ60.

[0040] The main control module 4 is used to determine whether the headlight 1 is faulty. If a fault occurs, the left front turn signal, right front turn signal, left rear turn signal, right rear turn signal, left turn signal, and right turn signal flash. Furthermore, the turn signal fault indicator on the instrument panel 2 flashes to alert the driver of the fault. Specifically, when the headlight 1 is operating normally, the fault detection terminal of the main control module 4 is connected to the power supply via a second resistor and a third resistor. When a fault occurs, the headlight driver chip turns on the transistor, and the first and third resistors are connected in series to divide the voltage. The main control module 4 determines whether the headlight 1 is faulty by detecting the change in potential at the fault detection point. The main control module 4 of the present invention utilizes a domain controller, specifically the LDCU-360. In this embodiment, the resistance values ​​of the first and second resistors are 1 kΩ, and the resistance value of the third resistor is 4.64 kΩ.

[0041] The following combination Figure 2 The connection relationship of a system for detecting vehicle lamp failure according to the present invention is described in detail.

[0042] The vehicle light 1 includes a left front turn signal, a right front turn signal, a left rear turn signal, a right rear turn signal, a left turn signal and a right turn signal, wherein the left front turn signal, the right front turn signal, the left rear turn signal and the right rear turn signal are respectively connected to the corresponding fault detection module 3. Taking the left front turn signal as an example, the headlight driver chip (MCU) is connected to the left front turn signal through a current detection line, the power input end of the headlight driver chip (MCU) is connected to the power supply, the output end of the headlight driver chip (MCU) is connected to the base of the transistor (Q), the emitter of the transistor (Q) is grounded through a first resistor (R1), the collector of the transistor (Q) is connected to the cathode of the diode (D), the anode of the diode (D) is connected to the fault feedback point (FB), the fault feedback point (FB) is connected to the power supply through a third resistor (R3), the fault feedback point (FB) is connected to the input end of the domain controller through a second resistor (R2), and the output end of the domain controller is respectively connected to the left front turn signal, the right front turn signal, the left rear turn signal, the right rear turn signal, the left turn signal, the right turn signal and the input end of the instrument panel 2.

[0043] The following describes in detail a method for detecting vehicle lamp faults according to the present invention.

[0044] The fault detection module 3 detects the current flowing through the headlight 1 via the current detection line. If the current flowing through the headlight 1 falls below the abnormal current threshold multiple times in a row, the fault detection module 3 outputs a fault feedback signal to the main control module 4. In this embodiment, after the headlight 1 is powered on, the fault detection module 3 resets within 50ms to eliminate the influence of the previous detection result on the current detection. 70ms after the headlight 1 is powered on, the headlight driver chip detects the current flowing through the headlight 1 every 10ms. After detecting abnormal current flow through the headlight 1 five times in a row, the headlight driver chip outputs an alarm signal to the base of the transistor to control the conduction of the transistor. The transistor of the present invention is an NPN type transistor. The headlight driver chip outputs a high level to control the conduction of the transistor. When the emitter and collector of the transistor are conductive, the first and third resistors are connected in series to divide the voltage. Because the headlight 1 generates a large current when it is turned on, the operating current only reflects the actual status of the headlight 1 when the headlight 1 is operating normally. The vehicle lamp driver chip of the present invention delays detection of the current flowing through the vehicle lamp 1 to avoid misjudgment caused by abnormal surge voltage at the moment of starting the vehicle lamp 1. The abnormal current threshold in the embodiment of the present invention is 0.3A.

[0045] 100ms after the vehicle is powered on, the main control module 4 detects the voltage at the fault detection point to determine whether the headlight 1 has failed. The main control module 4 detects the voltage at the fault detection point every 10ms. After five consecutive determinations of a headlight 1 failure, the main control module 4 controls the left front turn signal, right front turn signal, left rear turn signal, right rear turn signal, left turn signal, and right turn signal to flash. It also causes the turn signal failure indicator on the instrument panel 2 to flash, alerting the driver to a headlight 1 failure. When the headlight 1 is operating normally, the voltage detected by the main control module 4 is less than 1.5V. When the detected voltage exceeds 7V, the headlight 1 is determined to be in a faulty state. The main control module 4 in the present invention delays the detection of the current flowing through the headlight 1 to prevent misjudgments caused by abnormal surge voltage at the moment of starting the headlight 1.

[0046] The beneficial effects of the present invention are described in detail below.

[0047] The present invention monitors the vehicle lights 1 in real time. If any of the left front turn signal, right front turn signal, left rear turn signal, or right rear turn signal fails, the system automatically triggers a double flash alarm for all lights 1. Simultaneously, the turn signal failure indicator on the instrument panel 2 flashes. This dual warning system of lights and instruments avoids potential safety issues during lane changes and turns caused by turn signal failure, significantly reducing the risk of accidents such as rear-end collisions and minor collisions.

[0048] This invention improves fault detection accuracy and reduces false positives. Fault detection module 3 monitors the current of headlight 1 in real time via the headlight driver chip (S9S08DZ60). A fault is detected only when the current falls below the abnormal current threshold (0.3A) five times consecutively. This strategy, combined with a delayed detection mechanism, effectively distinguishes normal startup current fluctuations from actual faults, avoiding false alarms caused by transient interference such as voltage surges and poor contact.

[0049] The headlight driver chip in the present invention needs to make multiple judgments on the fault of the headlight 1, and the domain controller needs to make multiple judgments on the fault feedback signal, thereby reducing the risk of false feedback caused by low voltage or low temperature environment and reducing the probability of false triggering.

[0050] The system of the present invention has high reliability and is adaptable to the vehicle environment. It adopts the S9S08DZ60 headlight driver chip, has strong hardware anti-interference ability, and the combination of NPN transistors, diodes and voltage-dividing resistors forms a reliable signal feedback link, ensuring the stability of fault signal transmission and adapting to vibration, temperature fluctuations and other working conditions in the vehicle environment.

[0051] The dual-flash warning strategy of the present invention provides an intuitive reminder. When a fault occurs, all relevant lights 1 flash synchronously, providing a stronger visual warning than a single light alarm. This is particularly effective in alerting surrounding vehicles during the day or in complex lighting conditions. The synchronized flashing of the instrument panel 2 logo complements the light alarm, ensuring that the driver quickly detects the fault.

[0052] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A system for detecting vehicle lamp failure, characterized in that: It includes a headlight, an instrument panel, a fault detection module and a main control module. The headlight is connected to the fault detection module, the output end of the fault detection module is connected to the input end of the main control module, the output end of the main control module is connected to the input end of the headlight, and the output end of the main control module is connected to the input end of the instrument panel.

2. The system for detecting vehicle lamp failure according to claim 1, wherein: The fault detection module is used to perform fault detection on the vehicle lights. The fault detection module outputs a fault feedback signal to the main control module. The main control module outputs a control instruction to the vehicle lights. The main control module outputs a control instruction to the instrument panel.

3. The system for detecting vehicle lamp failure according to claim 1, wherein: The fault detection module includes a headlight driver chip, a transistor, a diode and a first resistor.

4. The system for detecting vehicle lamp failure according to claim 3, wherein: The headlight driver chip is connected to the headlight through a current detection line, the output end of the headlight driver chip is connected to the base of the transistor, the emitter of the transistor is grounded through a first resistor, the collector of the transistor is connected to the negative electrode of the diode, and the positive electrode of the diode is connected to the fault feedback point.

5. The system for detecting vehicle lamp failure according to claim 1, wherein: The main control module adopts a domain controller.

6. A system for detecting vehicle lamp failure according to claim 4 or 5, characterized in that: The fault feedback point is connected to the input end of the domain controller through a second resistor, and the fault feedback point is connected to the power supply through a third resistor.

7. A method for detecting vehicle lamp failure according to any one of claims 1 to 6, characterized in that: Step 1: The fault detection module detects the current flowing through the headlight through the current detection line. When the current flowing through the headlight is lower than the abnormal current threshold of the headlight for multiple consecutive times, the fault detection module outputs a fault feedback signal to the main control module; Step 2: After the main control module determines that the headlights are faulty, the main control module controls the headlights to flash and issues a warning through the instrument panel.

8. The method for detecting vehicle lamp failure according to claim 7, wherein: In step 1, the main control module delays detection of the fault feedback signal after the vehicle light is powered on.

9. The method for detecting vehicle lamp failure according to claim 7, wherein: In step one, the headlight driver chip in the fault detection module is reset after the headlight is powered on, and a delay is performed to detect the current flowing through the headlight. When the current flowing through the headlight is lower than the abnormal current threshold of the headlight for multiple times, the headlight driver chip outputs an alarm signal to the base of the transistor, and the collector and emitter of the transistor are turned on.

10. A method for detecting vehicle lamp failure according to claim 7 or 9, characterized in that: After the collector and emitter of the transistor are turned on, the third resistor and the first resistor are connected in series to divide the voltage, and the main control module determines whether the headlight is faulty by detecting the potential of the fault feedback point.

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