Misfire detection apparatus
AssigneeHonda Motor Co., Ltd.
InventorYuji Yasui
Life of this patent
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Abstract
Misfire of an engine is detected by extracting a pressure component of combustion from an output of a pressure sensor disposed in a cylinder. An engine misfire detection apparatus obtains a combustion parameter Cr that is a correlation between a reference signal Fc synchronous with the combustion cycle of the engine and cylinder pressure Pc obtained from an output of a pressure sensor disposed in the cylinder. The apparatus detects a misfire of the engine based on the combustion parameter. A misfire can be accurately detected even under a low load condition because the combustion parameter indicating the combustion component is extracted from the cylinder pressure as a correlation between the reference signal synchronous with the combustion cycle of the engine and the cylinder pressure obtained from the sensor output.
Claims14
A misfire detection apparatus for an engine, the apparatus comprising:
- means for determining a combustion parameter based on a correlation between a reference signal obtained by modeling a pressure component produced by combustion in a cylinder of the engine and cylinder pressure obtained from output of a pressure sensor disposed in the cylinder of the engine, the reference signal being synchronous with the combustion in the cylinder;
- means for detecting a misfire of the engine based on the combustion parameter;
- and
- means for calculating a reference parameter by filtering the combustion parameter.
A misfire detection method for an engine, comprising:
- determining a combustion parameter based on a correlation between a reference signal obtained by modeling a pressure component produced by combustion in a cylinder of the engine and cylinder pressure obtained from output of a pressure sensor disposed in the cylinder of the engine, the reference signal being synchronous with the combustion in the cylinder;
- detecting a misfire of the engine based on the combustion;
- and
- calculating a reference parameter by filtering the combustion parameter.
Dependencies are inferred from the claim text.