Patent ID: 9016046
Filing Date: 2015-04-28
Classification: F01N,F02B,Y02T

Abstract:
1. An internal combustion engine having at least one cylinder which has at least one outlet opening for discharge of exhaust gas via an exhaust-gas discharge system, comprising: an exhaust line adjoining each outlet opening; a storage catalytic converter for reduction of nitrogen oxides in the exhaust gas arranged in the exhaust-gas discharge system; a bypass line for bypassing the storage catalytic converter, the bypass line branching off from the exhaust-gas discharge system upstream of the storage catalytic converter so as to form a first junction and opens into the exhaust-gas discharge system again downstream of the storage catalytic converter so as to form a second junction; a first device for introducing reducing agent into the exhaust-gas discharge system between the first junction and the storage catalytic converter; a shut-off element for controlling the exhaust gas conducted through the storage catalytic converter; an SCR catalytic converter for reducing the nitrogen oxides in the exhaust gas arranged in the exhaust-gas discharge system downstream of the second junction; and a second device for introducing an amount of ammonia into the exhaust-gas discharge system upstream of the SCR catalytic converter and downstream of the second junction; wherein the amount of ammonia introduced is adjusted based on a level of NOx in the storage catalytic converter and further based on a portion of exhaust flow diverted around the storage catalytic converter.