大众 低压不充电的故障诊断与排除

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Volkswagen ID.4 Low Voltage no Charge Fault Diagnosis and Elimination

Zhang Runqiang，Cai Chuhua

(Guangzhou Trafic and Transportation Vocational School，Guangzhou 51O44O,China）

【Abstract】 In the face of the current detection and maintenance of new energy vehicles，many repairmen do not understand thecontrol principleofthebottom layer ofnewenergy vehiclemaintenanceandthe existenceof high voltage of vehicles，and do notdare torepair.Thispaper takesthefailureoflow-voltagechargingofa 2021-model Volkswagen ID.4 pure electric model as an example.Based on the previous maintenance experience，through theanalysis of the lowvoltage power supplysystem componentsof thismodelandthe working principleof thelow-voltagepower-on process, step bystep inspection，thecauseandfault pointof the low-voltage non-charging faultarefinallfound，and the fault is eliminated.The maintenance idea，fault analysisandtroubleshooting processof thefaultaresummarized forreference.

【Key words】 new energy vehicles；DC/DC converter； CAN bus signal； troubleshooting

0 引言

新能源汽车高压动力蓄电池输出的是高压直流电，通过连接高压和低压的 转换器转变为低压直流电，供给整车低压用电器正常工作。（剩余4383字）