Patent ID: 8068972
Filing Date: 2011-11-29
Classification: F02D,F02M,G01M

Abstract:
1. A method for controlling combustion of a spark-ignition internal-combustion engine, wherein an abnormal combustion is detected in a combustion chamber of at least one cylinder of the engine, a signal representative of a state of the combustion is recorded by a detector disposed in the engine and at least one indicator of the combustion at each engine cycle is determined from the signal for each engine cycle comprising: determining at least one parameter characterizing a distribution of a number of combustion indicator values acquired over the number of engine cycles preceding an engine cycle in progress either with an estimator or a method of modeling the distribution, by ignoring, at least some of the indicator values which are obtained during pre-ignition; defining at least one threshold for the at least one indicator by parameters characterizing the distribution; detecting a start of an abnormal combustion by comparing the at least one indicator of the combustion with the threshold; and controlling, in response to detecting the start of abnormal combustion, a course of the detected abnormal combustion in the at least one combustion chamber.