G3500 Engines Caterpillar


Detonation Sensor

Usage:

G3508 2TJ
爆震是空气/燃料混合气被火花塞点火之后出现的发动机的敲缸。 过量的机械应力和热应力可能降低发动机使用寿命。 有几种可能引起爆震。 例如空气/燃料混合气浓、过载、高压缩比和进气歧管空气温度高。

空气/燃料混合气的燃烧先于火花点火,造成过早点火。 这通常是由燃烧室热点引起的。 过早点火可能的原因为不正确的火花塞、不正确安装的火花塞和燃烧室的沉积物。 爆震可能是过早点火的结果。 过早点火具有提前点火正时的作用。

尽管传感器可能指示爆震的存在,但故障可能是过早点火。 爆震的指示也可能由发动机过量机械噪音引起的。 有关这类故障,请参阅测试和调整, "故障诊断和排除"。




图 1g00664778

旧式爆震传感器

(1) 缓冲器模块

(2) 加速度计




图 2g01045642

新式爆震传感器

(2) 加速度计

旧式爆震传感器由缓冲器模块 (1) 、爆震传感器 (2) 和接线组成。 检查部件。 确保接头和接线状况良好。

新式爆震传感器由加速度计 (2) 组成。 确保接头和接线状况良好。

爆震传感器的操作可以很容易地进行测试。

使用螺丝刀敲击加速度计附近的缸体。 如果爆震增加,说明传感器工作正常。

在发动机线束端部晃动爆震传感器导线的同时,监视爆震水平。 可能时,在发动机线束上从头至尾晃动爆震传感器导线。 如果爆震水平出现变化,说明故障出在接线上。

如果爆震传感器产生了针对电路故障的诊断代码,请参阅电子故障诊断和排除, SENR6413, "G3500发动机"。

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