论文大众EA888发动机常见故障与检修.doc

PAGE PAGE 1 毕业设计（论文） 设计题目 论大众EA888发动机常见故障与维修 学 院 北京电子科技职业学院 系 部 汽车服务系 专 业 汽车检测与维修技术 班 级 11汽修5-2 姓 名 纪岩 指导教师 刘敏杰 2015年 11月 目 录 摘要·······························································1 绪论···························································1 二、EA888发动机综述················································2 （一）发动机的分类···············································2 （二）大众EA系列发动机的分类····································3 （三）EA888发动机的组成····································4 （四） EA888发动机的使用价值························4 三、EA888发动机的结构特点与工作原理······························5 （一）进气可变气门正时·······································5 （二）缸内直喷系统······································6 （三）水冷涡轮增压技术···········································6 （四）进气歧管翻板···········································6 （五）可变排量机油泵···········································7 四、EA888在使用过程中主要问题原因分析与检修··············7 （一）常见的故障现象与成因分析··································8 （1）发动机正时链条跳齿故障··································8（2）EA888发动机“烧机油”··········· ··············9 结论··························································10 谢辞··························································10 七、参考文献······················································11 论大众EA888发动机常见故障与维修 摘要 在汽车的发展历史中，一个动力好，油耗低的发动机一直是人们追求的目标。随着电控技术在汽车领域的广泛应用，发动机技术得到了飞速的发展。在轿车日益普及，非熟练驾驶员大量增加的今天，汽车的发动机的可靠性跟燃油经济性应有着更加重要的意义。大众的EA888发动机应用改变了市场的格局，它继承上一代EA888发动机的油耗低 动力强的特点 还对其进行了改进 新EA888 \t /tech/201312/_blank 发动机的最大变化在于将排气歧管集成在 \t /tech/201312/_blank 缸盖内，这样的设计对于 \t /tech/201312/_blank 发动机的热效率有着积极的作用，利用排气温度可以让 \t /tech/201312/_blank 发动机的升温速度更快以致使其尽快达到工作温度，冬天可使车内尽快得到暖风。另一方面， \t /tech/201312/_blank 发动机的 \t /tech/201312/_blank 冷却系统也会牵制排气温度，最终控制增压后的进气温度，从而减轻 \t /tech/201312/_blank 中冷器的散热压力。随着大众EA888发动机在中国的大量的应用（大众速腾、迈腾、帕萨特、CC等），许多问题被暴露出来，这引起了人们对于这种优秀的发动机的质疑，在通过深入的研究之后，如何对其出现的一些特有故障的检修变成为关注的焦点，所以如何对其故障进行有针对性的原因分析与检修，就成为要这种变速器更好的为人们服务所必须要进行的一项