Patent ID: 8020370

Claim:
A method for an lambda control of an internal combustion engine with at least one catalytic converter allocated to an exhaust system of the internal combustion engine, with the exhaust system comprising a front lambda control circuit and a rear lambda control circuit with at least one rear oxygen sensor arranged downstream in reference of the catalytic converter, the method comprising the steps of: processing an output signal of the rear oxygen sensor by the rear lambda control circuit, forming a difference value between the output signal and a target lambda value, and issuing an actuating variable influencing the front lambda control circuit depending on the difference value, wherein after a change of the algebraic sign of the difference value, determining a balanced oxygen amount for a predetermined temporal interval since the change of the algebraic sign from the oxygen amount entered into the catalytic converter and removed therefrom, and selecting the actuating variable of the rear lambda control circuit additionally depending on the determined balanced oxygen amount.