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    Exhaust passage switching unit and method for internal combustion engine
    61.
    发明授权
    Exhaust passage switching unit and method for internal combustion engine 失效
    内燃机排气通道切换装置及方法

    公开(公告)号：US06321533B1

    公开(公告)日：2001-11-27

    申请号：US09576210

    申请日：2000-05-23

    申请人： Takashi Watanabe ,  Koichi Hoshi ,  Kazuhiro Sakurai

    发明人： Takashi Watanabe ,  Koichi Hoshi ,  Kazuhiro Sakurai

    IPC分类号： F01N700

    CPC分类号： F01N3/0878 ,  B01D53/0454 ,  B01D53/92 ,  F01N3/0835 ,  F01N13/009 ,  F01N13/0093 ,  F01N2550/06 ,  Y02T10/20

    摘要： A hydrocarbon adsorption apparatus is provided in an exhaust passage of an internal combustion engine. The hydrocarbon adsorption apparatus is equipped with a main passage, a switching valve for opening and closing the main passage, and a bypass passage for bypassing the main passage. The switching valve is coupled to a diaphragm of a diaphragm mechanism. A variable chamber in the diaphragm mechanism is connected to an intake manifold through a negative pressure feed line and a vacuum switching valve. When the vacuum switching valve is turned on, a negative pressure is supplied to the variable pressure chamber so that the diaphragm is deflected. In response to the deflection of the diaphragm, the switching valve is closed. The state of the switching valve is judged based on a tendency of changes in pressure of the negative pressure feed line when the vacuum switching valve is turned on.

    摘要翻译： 在内燃机的排气通路中设置有碳氢化合物吸附装置。 碳氢化合物吸附装置配备有主通路，用于打开和关闭主通道的切换阀以及用于绕过主通道的旁通通道。 切换阀连接到隔膜机构的隔膜。 隔膜机构中的可变室通过负压供给管线和真空切换阀连接到进气歧管。 当真空切换阀打开时，向可变压力室供给负压，使得隔膜被偏转。 响应于隔膜的偏转，切换阀关闭。 基于当真空切换阀打开时负压进给线的压力变化的趋势来判断切换阀的状态。