Patent ID: 8225649

Claim:
A method for determining the oxygen storage capacity of at least one region of an oxygen storage system that is assigned to a catalytic converter in an exhaust gas system of an internal combustion engine, and wherein in the outflow direction of the exhaust gas a first lambda probe is arranged ahead of the at least one region, and after the at least one region there is a second lambda probe, wherein in order to determine, a switchover operation from lean to rich exhaust gas and/or vice versa is effected; and the measurement signals of the first lambda probe are recorded over a time interval and made the basis of an integral calculation, wherein the start of a predetermined time interval is determined on the basis of the measurement signals of the second lambda probe, the start of the point in time is determined as the point in time at which the measurement values of the second lambda probe reach and the extreme value is determined by means of a sign change in the time derivation of the measurement signals of the second lambda probe.