Patent ID: 8037671
Filing Date: 2011-10-18
Classification: F02D,G01N

Abstract:
1. A method for operating an internal combustion engine, with at least one cylinder with a combustion chamber, an injection valve which is provided for dosing in the fuel, and an exhaust system in which an exhaust gas probe is arranged in an exhaust catalytic converter, the measured signal from said probe representing an air/fuel ratio in the combustion chamber of the respective cylinder, wherein a linear lambda control system is provided, the method comprising the steps of: following a jump from a preset rich air/fuel ratio in the combustion chamber of the respective cylinder to a preset lean air/fuel ratio, a plateau phase which occurs thereafter in the measured signal is detected and the duration of the plateau phase is determined as a storage period, following a jump from a preset lean air/fuel ratio in the combustion chamber of the respective cylinder to a preset rich air/fuel ratio, a plateau phase which occurs thereafter in the measured signal is detected and the duration of the plateau phase is determined as an evacuation period and depending on the storage period and the evacuation period, an allocation rule for assigning the measured signal to a detected air/fuel ratio is adjusted.