Device for operating internal combustion engine in motor vehicle, has diagnostic unit for temporarily correlating controlled change in set of output variables, where diagnostic value is determined based on correlation

摘要

The device has an exhaust gas duct (4) that comprises an exhaust gas catalytic converter (21) i.e. three-phase catalytic converter, and a lambda probe (42) that is arranged upstream of the exhaust gas catalytic converter. An exhaust gas valve (24) is arranged downstream of the exhaust gas catalytic converter. A diagnostic unit is provided for temporarily correlating a controlled change in a set of output variables or in a set of dependent variables by a predetermined threshold value change with a predetermined time period. A diagnostic value is determined based on the correlation.