Method and processing unit for adapting modeled reaction kinetics of a catalytic converter

A non-transitory, computer-readable medium containing instructions that when executed by a computer cause the computer to adapt modeled reaction kinetics (260) of at least one reaction taking place in a catalytic converter (130), with model-based fill level feedback control (210), by:

• specifying a setpoint value for at least one fill level, in the catalytic converter, of at least one exhaust-gas component that can be stored in the catalytic converter;
• calculating at least one fill level of the catalytic converter using a signal of an exhaust-gas sensor (145) upstream of the catalytic converter (130) and using a catalytic converter model with at least one storage capacity and reaction kinetics of the at least one reaction taking place in the catalytic converter (130);
• fill-level-dependent setting of a composition of an air-fuel mixture such that the calculated fill level approximates to the specified setpoint value;
• ascertaining (220) a difference between a detected signal of the exhaust-gas sensor (145) upstream of the catalytic converter (130) and a detected signal of an exhaust-gas sensor (147) downstream of the catalytic converter (130);
• and
• deactivating (240) the fill-level-dependent setting of the composition of the air-fuel mixture, renewed ascertainment (250) of the difference between the signals of the exhaust-gas sensors (145, 147) upstream and downstream of the catalytic converter (130) in the case of deactivated fill-level-dependent setting of the composition of the air-fuel mixture, and correction (260) of the reaction kinetics of the at least one reaction taking place in the catalytic converter (130) in accordance with a discrepancy between the differences between the detected signals of the exhaust-gas sensors upstream and downstream of the catalytic converter in the case of activated and deactivated fill-level-dependent setting of the composition of the air-fuel mixture.