COMBUSTION STATE DETECTING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To inhibit a variation width of a predetermined quantity carrying out a PID control well and to exactly detect an accidental fire state by detecting a variation amount of a correction quantity for correcting a time signal used for a judgment of combustion state and correcting a predetermined judgment value at the time of a combustion state judgment from the variation amount and an engine revolution speed. SOLUTION: A revolution number is detected by a revolution number detection means 101, the revolution number detected is corrected by a revolution number correction means 102 based on a correction signal and a state is detected by a burning state detection means 103 according to the revolution number after correction. The combustion state (existence or non-existence of an accidental fire) is judged by a combustion state judging means 104 based on the combustion state detected. At this, time, a correction amount for correcting the revolution number is calculated by a correction amount calculation means 105 due to a PID control based on the detection value of the combustion state and a variation amount of the correction quantity calculated by the correction quantity calculation means 105 is calculated by a correction quantity variation amount detection means 106. The variation amount is used for a judging material at the time of judging the combustion state in a combusting state judging means 104.