Abnormal combustion detection method for internal-combustion engines
First Claim
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.
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Abstract
The invention is an abnormal combustion detection method for spark-ignition internal-combustion engines. For each engine cycle, a parameter characterizing a distribution of N combustion indicator values, CA10 for example, acquired over N cycles preceding the cycle in progress, is determined while ignoring extreme values. A threshold is defined from this parameter for the combustion indicator. The start of an abnormal combustion is then detected by comparing the combustion indicator with this threshold and the course of the abnormal combustion detected in the combustion chamber is controlled.
28 Citations
30 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification