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A method for controlling regeneration fuel supplied to an internal combustion engine operating with a lean fuel-air mixture during sequential rich mixture regeneration events of a NOx adsorber in which NOx emissions collected by the adsorber are purged to provide optimum emissions control and minimu

A method for controlling regeneration fuel supplied to an internal combustion engine operating with a lean fuel-air mixture during sequential rich mixture regeneration events of a NOx adsorber in which NOx emissions collected by the adsorber are purged to provide optimum emissions control and minimum fuel consumption. The method monitors the exhaust gases flowing out of the adsorber during the regeneration event to detect when fuel-air mixture to the engine is within an excessively lean or rich range. When the sensed exhaust gases contain an excessively lean fuel-air mixture, fuel is increased to the engine. Fuel is decreased when the sensed exhaust gases contain an excessively rich fuel-air mixture. The fuel can be increased or decreased by adjusting the duration or fuel rate of the regeneration event.

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[ What is claimed is:] [1.]1. A method for controlling regeneration fuel supplied to an internal combustion engine operating with a lean fuel-air mixture during sequential rich mixture regeneration events of a NOx adsorber in which NOx emissions collected by the adsorber are purged, comprising the s

[ What is claimed is:] [1.]1. A method for controlling regeneration fuel supplied to an internal combustion engine operating with a lean fuel-air mixture during sequential rich mixture regeneration events of a NOx adsorber in which NOx emissions collected by the adsorber are purged, comprising the steps of:monitoring exhaust gases flowing out of the adsorber during a regeneration event to detect when a fuel-air mixture is within an excessively lean or rich range;increasing the fuel to the engine during a regeneration event following the first-recited regeneration event when the monitored exhaust gases contain an excessively lean fuel-air mixture; anddecreasing the fuel to the engine during said regeneration event following the first-recited regeneration event when the monitored exhaust gases contain an excessively rich fuel-air mixture,wherein the step of increasing the fuel to the engine is accomplished by increasing fuel rate to the engine and the step of decreasing the fuel rate to the engine is accomplished by decreasing fuel rate to the engine.