Method for operating linear lambda probe in exhaust gas duct of internal combustion engine in car, involves determining offset error of measurement signal from difference signal between pump voltage signal and Nernst voltage signal

摘要

The method involves determining a measurement signal (MS) of a linear lambda probe (3) based on an air-fuel ratio of gas flowing in an exhaust gas duct (1) of an internal combustion engine. A difference signal (DS) is generated based on a difference between a pump voltage signal (U P) and a Nernst voltage signal (U N). An offset error of the measurement signal is determined from the difference signal based on a stoichiometric ratio, and a target value (LAM SP) of the air-fuel ratio is determined based on a raw reference signal (LAM SP RAW) and a forced excitation signal (ZWA).