REGENERATION METHOD FOR EXHAUST-GAS AFTERTREATMENT SYSTEMS

摘要

The present invention relates to a method for regenerating exhaust-gas aftertreatment systems capable of storing nitrogen oxides in lean exhaust gas, and in rich exhaust gas to reduce nitrogen oxides to nitrogen. The invention is used in exhaust-gas aftertreatment systems which consist of at least one NOx storage catalyst arranged near the engine and at least one NOx storage catalyst located in the underbody of the vehicle and are intended to clean the exhaust gas of spark-ignition engines predominantly run on a lean mixture.