G3304B and G3306B Engines Caterpillar


Ignition Transformer

Usage:

G3304B A4E



图 1g00679230

点火变压器

各缸的点火变压器使得发动机点火系统的控制系统能够使用低电压(108 v)。 该低电压由电子控制模块(ECM)发送到变压器。 变压器将电压增大到能点燃火花塞的高电压(8,000 到 37,000 v)。

在使用高电压的点火系统中,通过次级接线的电流可明显减小。 传导高电压的几条电线增加了绝缘失效的可能,从而可能导致对地短路。 同时,电线中的电流影响方式与变压器中的电流变换相同。 感应电压会在线束中的电路之间互换。 该感应电压会导致产生功率损失和缺火故障。 与使用高电压的系统相比,使用低电压的点火系统具有这些优势:

  • 降低了通过次级接线的线路损失。

  • 降低了绝缘体故障和电流接地的可能性。

  • 降低了感应电压互换的可能性。

为确保正常工作,变压器的低电压接线端必须保持清洁且拧紧。 初级点火线圈和次级点火线圈的接地(负极接线端)标有 "−"。 变压器的正极接线端标有 "+"。

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