目录摘要................................1前言................................21.简述1.1关于转向沉重...................31.2转向沉重的解决方法..............31.3车辆工前准备及试车..............32.故障诊断维修2.1预约、接车......................42.1.1预约制单....................42.1.2接车........................52.2故障诊断及准备...................92.2.1故障描述....................92.2.2故障分析.....................92.2.3工具准备.....................102.3故障诊断流程.....................112.3.14S店维修流程................112.3.2故障诊断流程图...............122.4维修步骤及结论...................132.4.1维修步骤.....................132.4.2结论.........................192.5交车结算及售后回访................203.理论知识及拓展3.1转向系统的历史....................233.2EPS组成及功用.....................24总结.................................27致谢.................................28参考文献.............................29摘要汽车电动助力转向系统是现代汽车中比较常规的配置，是一种直接依靠电机提供辅助扭矩的动力转向系统。主要是由于它的工作效率高，能量消耗少；系统内部采用刚性连接，反应灵敏，滞后小，驾驶员的“路感”好；结构简单，质量小；系统便于集成，整体尺寸减小，省去了油泵和辅助管路，总布置更加方便；无液压元件，对环境污染少。本论文针对现代朗动轿车电动助力转向系统的典型故障进行分析和维修，解决电动助力转向系统存在的具体问题，提高汽车的使用寿命。【关键词】；电动助力转向；故障分析；故障排除1SummaryAutomobileelectricpowersteeringsystemisamoreconventionalconfigurationinmodernautomobile.Itisapowersteeringsystemthatdirectlyreliesonmotortoprovideauxiliarytorque.Mainlybecauseofitshighefficiencyandlowenergyconsumption;Thesystemadoptsrigidconnection,sensitivereaction,smalllag,andthedriver's"senseoftheroad";Simplestructureandsmallquality;Thesystemiseasytointegrate,theoverallsizeisreduced,theoilpumpandauxiliarypipelineareeliminated,thegenerallayoutismoreconvenient.Nohydrauliccomponents,lessenvironmentalpollution.Thispaperanalyzesandrepairsthetypicalfaultsoftheelectricpowersteeringsystemoftheexpresssedan,andsolvesthespecificproblemsofelectricpowersteeringsystem,andimprovesthelifeoftheautomobile.【Keywords】Electricpowersteering.Failureanalysis.Troubleshooting21.汽车(EPS)转向沉重简述1.1关于转向沉重转向沉重表现为：当驾驶员让行驶的汽车转弯时，转动方向盘，感到沉重吃力，这一问题将会严重影响驾驶员的驾车体验。1.2转向沉重的解决方法①.轮胎气压不足（