Importance

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Abstract

The end of a regeneration interval of an NOx accumulating catalytic converter for an engine run on a lean mixture is determined by detecting the end of the regeneration phase of the NOx accumulator using a sensor having a cross-sensitivity NOx and to a reducing agent in an exhaust-gas constituent which passes through the catalytic converter at the end of the regeneration phase. Exhaust-gas reducing constituents such as CO and NH.sub.3, which can be detected by a cross-sensitive NOx sensor, can be the exhaust-gas products detected at the end of the regeneration phase. By determining the end and beginning of a regeneration phase, different control functions and various types of information can be deduced, including control of the completion of rich-mixture engine operations, correction of a stored regeneration model in the engine management system, and ageing of the catalytic converter.

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First Claim