Patent ID: 6209314
Filing Date: 2001-04-03
Classification: F02D

Abstract:
A method for regulating the fuel/air ratio of an internal combustion engine, comprising the steps of:supplying an output signal from a first lambda probe, which is arranged in an exhaust duct of the internal combustion engine upstream of a catalyst, to a controller, the controller emitting a manipulated variable for the fuel/air ratio;measuring a period of the output signal of the first lambda probe under a condition of idling and under a condition of non-idling;forming a ratio of the period of the first lambda probe signal under non-idling condition to the period of the first lambda probe signal under idling condition, said ratio serving as weighting factor;supplying to the controller a correcting signal which is obtained from an output signal from a second lambda probe located downstream of the catalyst;weighting the correcting signal by the weighting factor; andwherein the correcting to be weighted is a holding time by which the output signal from the controller is time-shifted.