| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion state detecting device capable of obtaining the combustion state parameter properly indicating the combustion state of an engine from fewer detection values of the pressure inside the combustion chamber. SOLUTION: A first pressure P1 inside the combustion chamber, for example, at 60 degrees before the top dead center in the compression process of the engine, and a second pressure P2 inside the combustion chamber, for example, at 60 degrees after the top dead center in the expansion process are detected, and the pressure ratio P3/P2 is calculated. The combustion state parameter PRX is defined as P3/P2-1, and the combustion state of the engine is detected based on the parameter.
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