文档介绍：r场城市耶吐学院
Guangxi City College
毕业论文
题 目 微型汽车怠速不良原因及解决措施
分 院： 机电工程分院
专 业： 汽车技术服务与营销
班 级： 2007级03班
学 号：
学生姓名：
指导教师：
2010年01月15日
摘要
当发动机怠速运行时，节气门处于全关位置，即进入发动机的空气量不再由节气门进 行调节。怠速控制的实质就是通过怠速执行器调节进气量，同时配合喷油量及点火提前角 的控制，改变怠速工况燃料消耗所发出的功率，以稳定或改变怠速转速。发动机怠速不稳 是汽车使用中常见的故障之一。尽管现在大多数的轿车都有故障自诊断系统，但也会出现 汽车有故障方面自诊断系统却显示正常代码或显示与故障无关的代码情况。这通常不受电 控单元（ECU）直接控制的执行装置发生故障或传统机械故障造成。
关键词：怠速不稳；故障原因；分析诊断
Abstract
When engine idling regime movement, the damper is in the entire pass position, namely enters engine's air volume no longer to carry on the adjustment by the damper. The idling regime controFs essence is through the idling regime actuator adjustment air input, simultaneously coordinates the distributive value and the ignition angle of advance control, the power which the change idling regime operating mode fuel consumption sends out, by stable or change idling regime rotational speed. The engine idling regime not steady is in the automobilism one of common breakdowns. Although the present majority passenger vehicles have the breakdown from diagnosis system, but will also present the automobile to have the breakdown aspect from the diagnosis system actually demonstrated that the normal code or the demonstration the code situation which will have nothing to do with the breakdown. This (ECU) positive governing^ director is usually not had the electrically controlled unit the breakdown or the traditional mechanical breakdown creates.
Keywords： The idling regime is not steady; Breakdown reason; Analysis diagnosis
引言 1
1 汽车怠速 2
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2分析怠速不稳的原因 3
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221喷油器有故障 3
222燃油系统的问题 3
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3怠速不稳的诊断与解决措施 6
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4案例分析 9
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