Method for taking into account the actual degree of conversion of an exhaust emission control device

摘要

A method for taking account of the actual degree of conversion of a catalytic exhaust emission control device (4) arranged in the exhaust system (1) of an internal combustion engine (2) provides for an increase of the exhaust gas recirculation rate (exhaust gas recirculation valve 11) as a function of the actual degree of conversion and/or a prolonging of the external heating operation (electrically heated pre-catalytic converter 3) of the device (4) and/or a prolonging of the secondary air supply (secondary air pump 8).