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    • 1. 发明授权
    • Exhaust gas purifying system for internal combustion engine
    • 内燃机排气净化系统
    • US07506502B2
    • 2009-03-24
    • US10938561
    • 2004-09-13
    • Yasuaki NakanoShinya Hirota
    • Yasuaki NakanoShinya Hirota
    • F01N3/00
    • F01N3/0807F01N3/0814F01N3/0842F01N13/009F01N13/0093F01N2430/06F01N2610/03
    • In an exhaust gas purifying system including two NOx catalysts disposed in series with each other on an exhaust passage, oxides occluded in the NOx catalysts can be reduced appropriately. When the oxides occluded in an upstream or downstream NOx catalyst are reduced, the surrounding atmosphere of each NOx catalyst is changed between a reducing atmosphere and an oxidative atmosphere. The air-fuel ratio of exhaust gas upstream of the upstream NOx catalyst is made lower when the surrounding atmosphere of the downstream NOx catalyst is changed into a reducing atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into a reducing atmosphere, and the duration of the oxidative atmosphere is made longer when the surrounding atmosphere of the downstream NOx catalyst is changed into an oxidative atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into an oxidative atmosphere.
    • 在包括在排气通道上彼此串联设置的两个NOx催化剂的排气净化系统中,可以适当地减少NOx吸收剂中所含的氧化物。 当在上游或下游NOx催化剂中被吸收的氧化物被还原时,每个NOx催化剂的周围环境在还原气氛和氧化气氛之间变化。 当下游NOx催化剂的周围环境变成还原气氛时,上游NOx催化剂上游排气的空燃比比上游NOx催化剂的周围环境变为还原气氛时低, 当下游NOx催化剂的周围环境变成氧化气氛时,氧化气氛的持续时间比上游NOx催化剂的周围环境变为氧化气氛时的时间长。