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液压系统电磁阀分类

发布者:admin发布时间:2018-08-14 13:46:07点击量:463

 自动变速器液压系统常用的电磁阀根据其分类方式的不同分为以下几种。

  (1)根据控制倍号不同分类

  自动变速器液压系统的电磁阀根据其控制信号不同有开关型、比例型以及占空比型。

  开关型电磁冈:通常由ECT ECu输出的开关信号控制,电磁阀的状态有通、断两种位置。

  比例型电磁阀:常见的多为比例电磁铁控制节流阀,该类节流阀的输出压力与电磁铁的输入电流呈线性比例关系。

  占空比型电磁阀:这种电磁阀是由自动变速器Ecu输出的占空比信号控制,该类电磁阀的阀心伸缩有无数个位置。

  开关型电磁阀通常主要用于换档油路控制、锁止离合器控制:用于换档油路、主油压、蓄压器背压等液压控制。

  (2)根据控制液压泊路的流向分类

比例型或占空比型电磁阀

  电磁阀根据其控制液压油路的流向分类,可分为二通型和三温型。

  二通型电磁阀:用来控制某一油路的保压或排空。故又分为常保压式和常排空式两种。

  (a)常保压式二通型电磁阀。指当该电磁闽断电时,将其控制的油路与给压油路导迢,使压力升高;当该类电磁阀通电时,将其所控制的油路与泄压泊路导通,使其排空。

  (b)常排空式二通型电蹈阀。指当该电磁阀通电时,将其所控制的油路与给压油路导通,使其压力升高;当该电磁阀断电时,将其所控制的油路与泄压油路导通,使其排空。

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