| 摘要 |
PURPOSE:To improve the followability of a knock decision level, by calculating each cylinder cumulation % value for each cylinder from an all-cylinder average maximum value calculated on the basis of the maximum value of a knock sensor signal, and each cylinder correction value calculated at every maximum value detection, and determining the knock decision level on the basis of this value. CONSTITUTION:At each determined section, the maximum value of a knock sensor signal detected for each cylinder is detected, and the all-cylinder average value of the knock sensor signal is calculated without distinction of cylinders on the basis of this maximum value, and each cylinder correction value is calculated at every maximum value detection as above, and each cylinder cumulation % value of the predetermination of the knock sensor signal is calculated for each cylinder on the basis of the all-cylinder average value and each cylinder correction value. And, a knock decision level is determined on the basis of each cylinder cumulation % value, and the comparison of the knock sensor signal maximum value and the knock decision level is made for each cylinder, and the presence of a knock is discriminated. That is, a knock decision level is prepared by correcting an all-cylinder average value which is renewed at every maximum value detection, with each cylinder correction value which is renewed at every cycle, and renewed at every ignition. |
