Method and device for detecting auto-ignitions on the basis of measured and estimated internal cylinder pressure values of an internal combustion engine
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United States of America Patent
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Jan 16, 2018
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app pub date -
Oct 24, 2013
filing date -
Nov 21, 2012
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Abstract
A method is disclosed for detecting an auto-ignition in a spark-ignited internal combustion engine having at least one cylinder, wherein values for the combustion chamber pressure are measured during a compression stroke of the internal combustion engine at defined crankshaft angles within an evaluation window, a filtered pressure value is determined from the measured values for the combustion chamber pressure, theoretical pressure values in the combustion chamber that would arise if no combustion took place in the combustion chamber are determined for the defined crankshaft angles, the value of the pressure difference between the filtered pressure value and the theoretical pressure values is calculated, the value of the pressure difference is compared with a specified threshold value, and, if the threshold value is exceeded, an auto-ignition in the combustion chamber is inferred.
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