Self-check system of LED alarm lamp of automobile instrument

Abstract

The invention, which relates to the automobile fault detection system, relates to a self-check system of an LED alarm lamp of an automobile instrument. The self-check system is characterized in that: the work process of the system comprises the following steps: an ignition and self-check step is carried out; an LED state reading step is carried out; more particularly, if an LED is broken down and there is a short circuit fault, a detected voltage value is a low level that exceeds a range and a master control chip makes determination according to the detected voltage value; a step of detecting whether the LED is normal or not by carrying out comparison on a storage normal value; more particularly, if it is detected that a state of an LED at any one path or states of more LEDs is / are abnormal, processing is carried out on state information, the processed information is converted into preset fault codes that are DTCs, wherein the preset fault codes are corresponded to all alarm lamps, and the preset fault codes are stored into a plug-in E<2>PROM; and a step of sending CAN; more particularly, a one-chip microcomputer sends a frame of fault code data that are CAN messages to a CAN Bus as well as a corresponded module is informed of information that there is an fault on an alarm lamp. According to the invention, a mated diagnostic apparatus can be used to read a fault code value; and a concrete fault line is searched out according to a fault code list; therefore, investigation work is simplified and time is saved.

Description

technical field [0001] The invention relates to an automobile fault detection system, in particular to a self-inspection system for automobile instrument faults. Background technique [0002] In ordinary car instrumentation, since the alarm circuit will only work when a fault occurs, in order to know the status of the alarm lights, some important alarm lights will be lit for 3 seconds when the car is ignited, and the driver will activate it at this time. Within 3 seconds, judge whether the alarm lights are good or bad by visually observing whether the alarm lights are lit. With the continuous development of automotive electronics, there are more and more warning lights on the car instrument, and more and more warning lights are lit during ignition self-check. There are as many as 4 warning lights in this instrument that need to be self-checked when ignited. Because there are too many warning lights for self-inspection, the driver also needs to pay attention to other vehicl...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a self-inspection system for LED warning lamps of automobile instruments. The present invention solves the problem that there are too many warning lamps for self-inspection, and ordinary instruments need to be checked layer by layer to determine the fault location. A lot of troubleshooting work can determine the problem of the fault location

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