Fault on-line diagnosis method for LED vehicle lamp

Abstract

The invention relates to the technical field of vehicle lamp diagnosis, in particular to a fault online diagnosis method for an LED vehicle lamp. According to the LED vehicle lamp fault on-line diagnosis method, a vehicle-mounted control terminal is started, so a microprocessor drives a PWM signal generator to input a PWM signal i1 with a stable frequency to each LED vehicle lamp in a vehicle body, and the PWM signal i1 with the initial stable frequency is collected and recorded by a signal collection module; a signal acquisition module is used for acquiring and recording a diagnosis PWM signal i2 output by each LED vehicle lamp, and the signal acquisition module detects whether each LED vehicle lamp has a fault or not by comparing the phase difference and the voltage amplitude of the input PWM signal i1 and the WM signal i2. According to the LED vehicle lamp fault on-line diagnosis method provided by the invention, whether the content of the LED vehicle lamp has a fault is detected by comparing the phase difference and the voltage amplitude of the input PWM signal and the output PWM signal, and meanwhile, the result is judged and concluded, so a large amount of manual processing time is saved, and digitization of experience is realized.

Description

technical field [0001] The invention relates to the technical field of vehicle lamp diagnosis, in particular to an online fault diagnosis method for LED vehicle lamps. Background technique [0002] Automobile fault diagnosis technology refers to the automotive application technology that determines the technical status and working status of the car, and finds out the cause and location of the fault through equipment and vehicle performance without dismantling and dismantling the entire vehicle. [0003] At present, after the LED lights of automobiles fail, it is difficult to find them in time if they are not used. As a result, some cars will only find the faulty LED lights after driving. Traditional LED car light fault diagnosis requires experience or relevant knowledge background. Professionals, in a specific place, complete a series of activities such as inspection, measurement, analysis, and judgment, which makes it difficult for some ordinary people to know the fault sta...

AI Technical Summary

Problems solved by technology

[0003] At present, after the LED lights of automobiles fail, it is difficult to find them in time if they are not used. As a result, some cars will only find the faulty LED lights after driving. Traditional LED car light fault diagnosis requires experience or relevant knowledge background. Professionals, in a specific place, complete a series of activities such as inspection, measurement, analysis, and judgment, which makes it difficult for some ordinary people to know the fault status in time

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