Patent ID: 7874204

Claim:
Method for determining a correction value for the lambda center position which is specified in the control of the air/fuel ratio which is force-modulated between a first lean lambda value and a second rich lambda value and supplied to an internal combustion engine or a catalyst, using the signal from a binary jump sensor downstream from a catalyst volume, and whenever the signal from the binary jump sensor jumps from “lean” to “rich” or from “rich” to “lean” the air/fuel ratio is switched back and forth between the first lean lambda value and the second rich lambda value, wherein the time period between two jumps in the signal (Uλ), which indicates the residence time (T 1 ) in the lean phase or the residence time (T 2 ) in the rich phase, is determined, and the correction value (λk) for the lambda center position (λm) specified by the control system is determined from the first lean lambda value (λ 1 ), the second rich lambda value (λ 2 ), the first residence time (T 1 ), and the second residence time (T 2 ).