Method and device for recognizing and differentiating a cause of at least one misfire of an internal combustion engine

摘要

The present disclosure relates to a method for recognizing and differentiating a cause of at least one misfire (V) of an internal combustion engine (10), the internal combustion engine (10) having several cylinders (CYL (0) -CYL (5)), at least one exhaust gas tract (13A , 13B) and an exhaust gas sensor (15A, 15B) which is arranged in the exhaust gas tract (13A, 13B), the method comprising the following steps: - Acquisition of a measurement signal (MS_CYL)) with the exhaust gas sensor (15A, 15B) via a certain first time period (Δt1), the measurement signal (MS_CYL) being characteristic of the oxygen content in the exhaust tract (13A, 13B), - dividing the measurement signal (MS_CYL) into measurement signal segments (MS_CYL_AB), - assigning the measurement signal segments (MS_CYL_AB) to the corresponding cylinders (CYL (0) -CYL (5)), whereby cylinder-selective measurement signal curves (MS_CYL_SEL (0-5)) are created which are characteristic of the respective oxygen content downstream of the respective cylinder (CYL (0) -CYL (5)) the determined first time span (Δt1), - evaluation of the cylinder-selective measurement signal curves (MS_CYL_SEL (0-5)) to detect at least one misfire (V) of the internal combustion engine (10).