Patent ID: 6904752
Filing Date: 2005-06-14
Classification: B60H,F01L,F01N,F01P,F02B,F02D,Y02T

Abstract:
1. A system to regenerate an exhaust aftertreatment device of a multicylinder engine that operates primarily at an air/fuel ratio that is lean of stoichiometry, comprising: a controller operable to deactivate at least one cylinder using a cylinder deactivation system and operable to enrich a fuel charge to each non-deactivated cylinder using a fuel control system, based upon input from at least one sensor operable to monitor an engine operating condition and based upon input from a sensor operable to measure exhaust gas; wherein the exhaust aftertreatment system comprises a diesel particulate trap, an oxidation catalyst, and an NOx adsorber; wherein said controller is operable to maintain an operating point of the engine, and wherein said controller operates the engine at an air/fuel ratio that is rich of stoichiometry such that a temperature of the NOx adsorber is sufficient to desulfate the NOx adsorber.