汽车发动机怠速成抖动现象的原因及排查方法探讨(王瑞陵)(1)

枣庄职业学院

毕业设计（论文）

题目：汽车发动机怠速抖动现象的原因

及排查方法探讨

系部：汽车工程系

专业：汽车检测与维修技术

学号：************

学生姓名：***

指导教师：***

职称：副教授

二O一二年六月十六日

摘要

本文主要阐述了汽车发动机怠速抖动机理，分析了导致发动机产生怠速抖动现象的故障原因，提出了发动机怠速抖动故障的排查方法。在文中结合了实际的维修实例加以论证分析。同时阐明整个故障的排除过程及方法，鉴于大家起到共同探讨作用。

关键词：汽车发动机怠速抖动原因排查方法

Abstract

This article mainly elaborated the Automobile Engine Idle Wobbling mechanism, analyzes the causes of Engine Idle Wobbling phenomenon causes, puts forward the idling engine wobble trouble shooting method. In this paper combined with practical examples to demonstrate analysis repair. While the troubleshooting process and methods, as we work together to explore the role of.

Key wor d：Automobile Engine Idle Wobbling reasons investigation method

目录

1 引言 .................................................................................................................................................... - 1 -

2 怠速的基本概述 ................................................................................................................................ - 2 -

2.1 发动机怠速定义.......................................................................................................................... - 2 -

2.2 发动机怠速作用.......................................................................................................................... - 2 -

2.3 深刻理解电控发动机怠速控制原理........................................................................................ - 2 -

2.3.1 基本怠速设置................................................................................................................... - 2 -

2.3.2目标怠速调节.................................................................................................................... - 3 -

2.3.3 附件工作怠速调整........................................................................................................... - 3 -

3 汽车发动机怠速抖动机理................................................................................................................... -

4 -

3.1发动机正常振动的不平衡激振力和力矩................................................................................... - 4 -

3.2发动机在车架上的振动形式....................................................................................................... - 4 -

4 怠速产生抖动现象的原因................................................................................................................... -

5 -

4.1 怠速开关信号电路原因.............................................................................................................. - 5 -

4.2 怠速控制阀及其电路原因.......................................................................................................... - 5 -

4.3 空气流量计及其电路原因.......................................................................................................... - 5 -

4.4 喷油器及其电路原因.................................................................................................................. - 6 -

4.5冷却液温度传感器及其电路原因............................................................................................... - 6 -

4.6 燃油泵及油路系统原因.............................................................................................................. - 6 -

4.7 空调开关信号电路原因.............................................................................................................. - 6 -

4.8 废气再循环阀及其电路原因...................................................................................................... - 6 -

4.9 空档起动开关电路原因.............................................................................................................. - 7 -

4.10 点火系故障................................................................................................................................ - 7 -

4.11 其他故障.................................................................................................................................... - 7 -

5 怠速抖动的故障诊断及排除怠速不稳............................................................................................... - 8 -

5.1 怠速不稳，易熄火...................................................................................................................... - 8 -

5.1.1 故障现象........................................................................................................................... - 8 -

5.1.2 故障原因......................................................................................................................... - 8 -

5.1.3 故障诊断与排除............................................................................................................. - 8 -

5.2 冷车怠速不稳、易熄火.......................................................................................................... - 9 -

5.2.1故障现象............................................................................................................................ - 9 -

5.2.2故障原因............................................................................................................................ - 9 -

5.2.3.故障诊断与排除.............................................................................................................. - 10 -

5.3 热车怠速不稳或熄火................................................................................................................ - 10 -

5.3.1 故障现象......................................................................................................................... - 10 -

5.3.2 故障原因......................................................................................................................... - 10 -

5.3.3故障诊断与排除.............................................................................................................. - 11 -

5.4热车怠速过高............................................................................................................................. - 11 -

5.4.1故障现象.......................................................................................................................... - 11 -

5.4.2.故障原因.......................................................................................................................... - 11 -

5.4.3故障诊断与排除.............................................................................................................. - 12 -

5.5怠速上下波动............................................................................................................................. - 13 -

5.5.1故障现象.......................................................................................................................... - 13 -

5.5.2故障原因.......................................................................................................................... - 13 -