Patent ID: 8468798

Claim:
A device for the lambda control of an internal combustion engine with an exhaust catalyst, comprising a single lambda probe as control probe mounted downstream from the exhaust catalyst without a lambda probe mounted upstream from the exhaust catalyst, a lambda control mechanism for adjustment of a post-catalyst lambda value to a predetermined value as a function of the predetermined degree of charging of an oxygen reservoir of the exhaust catalyst and as a function of the degree of conversion of the exhaust catalyst, means for determining an oxygen input to the exhaust catalyst based on a comparison of the post-catalyst lambda value and the predetermined value, wherein the predetermined value is a second lambda value of exhaust gas exiting an exhaust catalyst, wherein the determination of the oxygen input to the exhaust catalyst is made without considering a lambda value of exhaust gas entering the exhaust catalyst; and means for adapting the predetermined value as a function of the determined oxygen input.