AS1201FM-U10/32-03 SMC直通型速度控制阀

SMC直通型速度控制阀，SMC直通型速度控制阀的原理

SMC直通型速度控制阀装在节汽门旁通空气孔上，由怠速控制器依据点火信号，在引擎转速低于750RPM时，即使怠速控制阀动作，以提升引擎转速，

在引擎转速超过1050RPM后,则停止动作。在配备冷气系统的车种，又将此控制阀称为怠速提速阀后因冷气压缩机动作后，产生引擎负载，使引擎怠速降低，而怠速控制阀随之动作，以维持怠速的稳定性。

SMC直通型速度控制阀主要部件有磁铁、电枢和旋转滑阀等以及螺旋回位弹簧、电刷及引线等组成，滑阀固装在电枢轴上，与电枢轴一起转动，用以控制流过旁通气道的空气量。磁铁固装在外壳上，其间形成磁场。电枢位于磁铁的磁场中，电枢铁心上缠有两组绕向相反的电磁线圈W1和W2。当线圈W1通电时，电枢带动旋转滑阀顺时针偏转，空气旁通道关小；当线圈W2通电时，电枢带动旋转滑阀逆针偏转，空气旁通道截面开大。W1和W2的两端与电刷集电环相连，经电刷引出与ECU相连接。如图3－26所示，电枢轴上的电刷集电环，类似电动机换向器结构，它由三段滑片围合而成，其上各有一电刷与之接触。电枢线圈W1和W2的两端分别焊接在相应的滑片上。当点火开关旋至“ON”时，接线插头“2”上即有蓄电池电压，电枢线圈W1和W2是否通电，则由ECU中控制W1和W2搭铁的三极管VT2和VT1的通断状态决定。由于占空比控制信号和三极管VT1的基极之间接有反相器，故三极管VT1

和VT2集电极输出的相位相反。因此，旋转滑阀式怠速控制阀上的两个电枢线圈总是交替地通过电流，又因两组线圈绕向相反，致使电枢上交替产生方向相反的电磁力矩。

SMC直通型速度控制阀，SMC直通型速度控制阀的原理

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SMC直通型速度控制阀，SMC直通型速度控制阀的原理