Patent ID: 7706959

Claim:
Method for adjusting a fuel/air mixture by means of a two-point regulator, in which method a desired fuel/air mixture is regulated as a function of a measurement signal of a lambda sensor configured as a bistable sensor, whereby the switching point of the two-point regulator is adapted, comprising the following method steps: displacing the switching point of the two-point regulator in the direction of the desired lambda value, which deviates from the stoichiometric ratio, recording the oscillation of the measurement signal of the lambda sensor around the switching point, whereby a regulation stroke that remains the same is assured, predetermining a reference value of the oscillation of the measurement signal of the lambda sensor around the switching point, in each instance, displacing the switching point of the two-point regulator in such a manner that the reference value of the oscillation of the measurement signal of the lambda sensor occurs, whereby the set value of the injection amount is changed by a defined amount, if the measurement value goes above or below the switching threshold, so that the measurement value signal of the sensor output voltage oscillates around the switching threshold.