Method and device for the exhaust gas aftertreatment of a combustion engine

A method for the exhaust gas aftertreatment of a combustion engine, whose exhaust is connected to an exhaust system,

• in which exhaust system are disposed, in the direction of exhaust gas flow through the exhaust system, a first catalytic converter, a second catalytic converter downstream of the first catalytic converter, and a third catalytic converter downstream of the second catalytic converter;
• in an exhaust duct of which exhaust system are disposed a first lambda probe upstream of the first catalytic converter, a second lambda probe downstream of the first catalytic converter and upstream of the second catalytic converter, a third lambda probe downstream of the second catalytic converter and upstream of the third catalytic converter;
• and
• wherein one of the catalytic converters disposed downstream of the first catalytic converter being actively heatable;
• the method comprising the following steps:
• actively heating one of the catalytic converters downstream of the first catalytic converter;
• comparing the component temperature of the heated catalytic converter to the particular light-off temperature of the catalytic converter;
• and
• controlling the fuel/air ratio via a lambda control of the combustion engine via that lambda probe disposed downstream of the last three-way catalytic converter to reach the light-off temperature thereof.