Apparatus for detecting abnormal combustion in a combustion engine
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United States of America Patent
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Dec 6, 2016
Grant Date -
Aug 20, 2015
app pub date -
Nov 13, 2013
filing date -
Nov 16, 2012
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Abstract
A spark ignition internal combustion engine includes: a compression ratio changing mechanism by which a volume of a combustion chamber varies; a cylinder internal pressure sensor that acquires a pressure signal of a pressure vibration inside a cylinder; and an abnormal combustion detector including a filter that passes the pressure signal, of a set frequency band among the pressure signal, and detecting an occurrence of abnormal combustion based on the pressure signal having passed through the filter. The abnormal combustion detector sets a frequency band of the filter based on a crank angle section in which abnormal combustion occurs and on a mechanical compression ratio.
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