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电控燃油喷射式发动机,一般都在进气管旁通道上安装怠速控制阀,其怠速控制过程是由电控单元(ECU)根据节气门位置传感器、温度传感器、空调开关、动力转向开关等送来的信号,经比较处理后发出怠速信号,控制怠速控制阀的开度,也即通过改变旁通气道的大小,来达到稳定怠速之目的。维修实践中经常遇到发动机无怠速,怠速忽高忽低,冷车无快怠速,开空调后怠速下降,行驶中
The electronically controlled fuel injection engine generally has an idle speed control valve installed on the side of the intake pipe. The idle speed control process is sent by an electronic control unit (ECU) according to a throttle position sensor, a temperature sensor, an air conditioner switch, a power steering switch, etc. Of the signal, issued by the comparison idle signal, control the opening of the idle speed control valve, that is, by changing the size of the bypass air channel to achieve the purpose of a stable idle speed. Maintenance often encounter engine idle without idle, idling suddenly high and low, cold idle no idle speed, air conditioning idling decline, driving