Exhaust gas purification device for an engine and A/F ratio control for early activating a NOx trapping catalyst
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United States of America Patent
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Feb 11, 2003
Grant Date -
N/A
app pub date -
Feb 2, 2000
filing date -
Feb 3, 1999
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Abstract
An exhaust gas purification device including three-way catalysts connected to engine cylinder groups and arranged in parallel, and a NOx trapping catalyst connected with the three-way catalysts downstream thereof. A controller controls fuel injection for making an A/F ratio of exhaust gas flowing into one of the three-way catalysts rich relative to a stoichiometric A/F ratio when it is required to reduce the NOx trapped by the NOx trapping catalyst.
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