Exhaust purification device and exhaust purification method of internal combustion engine
    2.
    发明授权
    Exhaust purification device and exhaust purification method of internal combustion engine 有权
    内燃机排气净化装置及排气净化方法

    公开(公告)号:US07685812B2

    公开(公告)日:2010-03-30

    申请号:US10537748

    申请日:2004-10-04

    IPC分类号: F01N3/00

    摘要: A NOx storing catalyst (11) comprising a precious metal catalyst (46) and NOx absorbent (47) is arranged in an exhaust passage. When the air-fuel ratio of the exhaust gas is lean, the storing catalyst cold stores the NO2 contained in the exhaust in the absorbent when the catalyst is inactive and hot stores the cold stored NO2 in the absorbent when the catalyst is made active. The NO2 contained in the exhaust is cold stored in the absorbent when the catalyst is not activated, and when a predetermined NOx storing catalyst restoring condition (107) is met, a NOx storing catalyst restoring control (109, 115) including raising the NOx storing catalyst temperature to a predetermined temperature to active it (109) is executed so as to restore the cold storing capability of the NOx absorbent.

    摘要翻译: 包含贵金属催化剂(46)和NOx吸收剂(47)的NOx储存催化剂(11)布置在排气通道中。 当排气的空燃比为稀时,当催化剂不活动时,储存催化剂冷存储在吸收剂中的排气中的NO 2,并且当催化剂活化时,将热的储存的NO 2储存在吸收剂中。 当催化剂未被活化时,排气中含有的NO2被冷藏在吸收剂中,并且当满足预定的NOx储存催化剂恢复条件(107)时,存储催化剂复原控制(109,115)包括提高NOx储存 催化剂温度达到预定温度以使其活化(109),以恢复NOx吸收剂的冷藏能力。