Recognizing irregular combustion processes in a cylinder of an internal combustion engine during a starting phase of the internal combustion engine

摘要

A method of detecting irregular combustion events in a cylinder of an internal combustion engine during a starting phase of the internal combustion engine, the method comprising detecting the rotational speed of a rotating crankshaft of the internal combustion engine, determining a time profile (222) of the rotational speed based on the detected rotational speed and at least one previously detected value for the rotational speed of the crankshaft, determining the time derivative (242) of the course of the rotational speed, determining a moving average (244) for the time derivative (242) of the rate of rotation (222), calculating a difference value (243, 245) between the times Deriving (242) the curve (222) of the rotational speed and the moving average (244) within a predetermined time window, which contains a local maximum (242a, 242b) of the time derivative (242) of the curve (222) of the rotational speed, and detecting an irregular combustion event when the calculated difference value (243, 245) falls below a predetermined reference differential value.