METHOD FOR HEATING AN EXHAUST GAS AFTER-TREATMENT COMPONENT IN THE EXHAUST GAS SYSTEM OF A SPARK-IGNITED INTERNAL COMBUSTION ENGINE

The invention relates to a method for heating an exhaust aftertreatment component (48) in an exhaust system (40) of an internal combustion engine (10), comprising the following steps: - opening the inlet valve (20), whereby fresh air flows into the combustion chamber (12) for producing an ignitable fuel-air mixture, - closing the inlet valve (20), whereby an ignitable fuel-air mixture is produced in the combustion chamber (12), - igniting the ignitable fuel-air mixture in a power stroke of the combustion chamber (12), whereby the piston moves from a top dead center in the direction of a bottom dead center, - opening the exhaust valve (22), whereby the combustion products produced during combustion, - closing the exhaust valve (22) and reopening the inlet valve (20) when the piston (70) is in a downward movement following the ignition of the ignitable fuel-air mixture, whereby additional fresh air is drawn into the combustion chamber (12), and - closing the inlet valve (20) and reopening the exhaust valve (22), whereby the fresh air drawn into the combustion chamber (12) upon the reopening of the inlet valve (20) is introduced as secondary air into the exhaust system (40). The invention further relates to a spark-ignition internal combustion engine (10) with an exhaust system (40) for carrying out such a method.