Engine cylinder deactivation to improve the performance of exhaust emission control systems
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United States of America Patent
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Jun 14, 2005
Grant Date -
Jul 3, 2003
app pub date -
Nov 25, 2002
filing date -
Nov 30, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a controller and cylinder deactivation system to regenerate an exhaust aftertreatment device for a multicylinder engine that operates primarily at an air/fuel ratio that is lean of stoichiometry. The invention uses the cylinder deactivation system to control temperature and air/fuel ratio of an exhaust gas feedstream going into an aftertreatment device. The invention also increases the amount of fuel delivered to each non-deactivated cylinder by an amount sufficient to maintain operating power of the engine. The regeneration action includes desorbing NOx from a NOx adsorber catalyst, desulfating the NOx adsorber catalyst, and purging a diesel particulate trap.
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