消防车乘员室内顶灯开关致氛围灯闪烁问题分析与改进

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中图分类号：U463.855 文献标识码：B 文章编号：1003-8639（2026）03-0168-03

Analysis and Improvement of the Flashing of Ambient Lights Caused by the Ceiling Light Switch in the Fire Truck Crew Compartment

LiRenming，WangJiaxi，Peng Xiaowei，Li Yalun （Hubei Qixing Automobile Body Co.，Ltd.，Suizhou 44130o，China）

【Abstract】 In response to the malfunction where the ambient light in the passenger compartment of a certain typeoffire engine flickers momentarily when the switch is moved between diffrent positions，a systematicanalysis and improvement study was conducted.The LEDambientlight driving circuit of this fire enginedoes not adopta constant current driving scheme，but instead uses a design form of resistor voltage reduction combined with capacitor filtering for voltage stabilization.Through the research on the circuit design and fault phenomenon，this paper proposes the troubleshooting ideas and improvement suggestions for such electrical faults.

【Key words】 ceiling lamp;switch; ambient lamp flickering; constant current drive source

0 引言

我公司为国内某知名工程机械企业开发的某型消防车乘员室产品，在小批量交付20余台后，主机厂服务人员反馈故障。（剩余3257字）