汽车发动机怠速不稳的故障诊断与维修

Fault diagnosis and maintenance of unstable idle speed of automobile engine

怠速不稳是汽车发动机的常见故障之一,对汽车发动机行驶安全及使用寿命有较大影响.根据发动机怠速控制原理,从机械零件故障、进气系统故障、点火系统故障、燃油系统故障、外部阻力突变故障等方面对汽车发动机怠速不稳故障产生的原因进行分析,并给出诊断思路和排除方法,为发动机怠速不稳故障的诊断和维修提供参考.

Unstable idle speed is one of the common faults of automobile engine,which greatly affects the driving safety and service life of an automobile engine.According to the idle speed control principle,we analyzed the reasons for unstable idle speed from many aspects such as machine parts fault,intake system fault,ignition system fault,fuel system fault,sudden change of external resistance and etc,and proposed the diagnosis ideas and exclusion methods,which provided reference for the diagnosis and maintenance of unstable idle speed of automobile engine.