Patent ID: 9482128
Filing Date: 2016-11-01
CPC Classification: F01N,F02B,F02D,F02M,Y02A,Y02T

Claim Text:
1. A method for regenerating a nitrogen oxide storage catalytic converter which is arranged in an exhaust line of a lean-burn engine, wherein the engine is provided with a low-pressure EGR valve in a low-pressure EGR line and a device for reducing exhaust-gas discharge and/or a device for reducing the intake air, comprising: performing an overrun operation of the engine, during which the engine does no positive work though continues turning over, commencing regeneration of the nitrogen oxide storage catalytic converter during the overrun operation, and during regeneration of the nitrogen oxide storage catalytic converter, throttling the intake air by the device for reducing the intake air and/or reducing the discharge of the exhaust gases by the device for reducing exhaust-gas discharge, and conducting at least a portion of the exhaust gas in a circuit through the low-pressure EGR valve via the engine and the nitrogen oxide storage catalytic converter, wherein during regeneration of the nitrogen oxide storage catalytic converter, an air-fuel mixture is set to a lambda value of ≦1.