Working Principle Analysis and Fault Setting System Design of Car Lighting Circuit Based on Modularization

With the development of automobile electronic technology, higher requirements are put forward for automobile service personnel. In order to improve the technical level of automobile maintenance personnel, a modularized automobile lighting circuit fault setting system is proposed. First of all, the circuits of the headlights, the rear fog lamp and the front fog lamps of FAW (First Automotive Works) Weizhi car are taking as examples, the selection of which is typical. Analysis of its working principle and failure phenomena that may lead to unlit lights, burnt bulbs, normally lit lights, dim lights and other failures shows that it may contain 59 fault points. Then, a modular design idea and control logic is proposed. Select the STC12C5A60S2 main control single-chip microcomputer, decoders, drivers, relays, the LCD liquid crystal display and other main devices, and design the connection relationship between the devices and necessary auxiliary circuits. The key module is used to select the corresponding fault and display it on the LCD screen. The single-chip controls decoders to output a low level, and then drivers control the operation of the corresponding relays to achieve the management of the fault lines, which helps to realize the setting of three typical fault causes such as open circuit, short circuit and poor contact.