Internal combustion engine misfire detection device, internal combustion engine misfire detection system, data analysis device, and internal combustion engine control device

摘要

PROBLEM TO BE SOLVED: To provide a misfire detection device capable of determining the presence or absence of a misfire by utilizing information on the rotational behavior of a crankshaft at an angle interval smaller than the angle interval between compression top dead centers. SOLUTION: A CPU inputs a minute rotation time T30 (1) to T30 (24), which is a time required for rotation of each 30 ° CA in one combustion cycle, a rotation speed NE, and a filling efficiency η, and the same 1 The probabilities P (1) to P (4) of misfire in each cylinder # 1 to # 4 in the combustion cycle are calculated (S16). Then, when the number of times N at which the maximum value of the probabilities P (1) to P (4) becomes the threshold value Pth or more within the predetermined period becomes the predetermined number of times Nth or more (S22: YES), the fail flag F is set to deal with the misfire. Substitute "1" (S24). [Selection diagram] Fig. 2