论文部分内容阅读
火花塞电气绝缘性能的好坏,通常用侧电极与中心电极之间的绝缘电阻值的大小来衡量,正常情况下其绝缘电阻值的大小都在10MΩ以上,由于火花塞热特性选择不当,发动机气缸磨损过大,曲轴箱机油过多等原因,火花塞裙部容易被燃烧产生的沉积物污损,这些沉积物构成的电流泄漏通路,降低了火花塞的点火可靠性,致使发动机出现起动困难、加速不良、油耗和排放明显恶化、工况不稳定或熄火停机故障,用兆欧表测定两电极间绝缘电阻值的大小可以初步判定火花塞被污损程度。
Spark plug electrical insulation performance is good or bad, usually with the side electrode and the center electrode between the insulation resistance value to measure the size of the insulation resistance under normal circumstances are more than 10MΩ, due to improper selection of spark plug thermal characteristics, the engine cylinder wear Too large, too much crankcase oil and other reasons, the spark plug skirt is easy to be fouled by sediment combustion, these deposits constitute the current leakage path, reducing the ignition spark ignition reliability, resulting in engine starting difficulties, poor acceleration, Fuel consumption and emissions significantly deteriorated, unstable conditions or shutdown failure, with the megger to measure the size of the insulation resistance between the two electrodes can be initially judged spark plug was fouling.