Device and method for internal combustion engine control
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United States of America Patent
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Oct 30, 2007
Grant Date -
Sep 23, 2004
app pub date -
Mar 21, 2003
filing date -
Mar 21, 2003
priority date (Note) -
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Abstract
A method is described for operating an engine coupled to an upstream and downstream emission control device that stores and reacts oxidants such as NOx. The method transitions from lean to stoichiometric or rich operation under various conditions. The amount of fuel used during the stoichiometric or rich operation is minimized by using an upstream three-way catalyst primarily used for NOx storage, and a downstream three-way catalyst primarily used for oxygen storage.
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