| 摘要 |
PURPOSE:To improve the accuracy of control by deciding an air-fuel ratio on both the air-fuel ratio judged by weightedly processing a detected state of engine operation and the air-fuel ratio presumed from cylinder pressure, and learning the coefficient of weighting on the correctness of judgment to improve a correct answer judging rate. CONSTITUTION:A cylinder pressure signal detected by a cylinder pressure sensor 1 is inputted into an air-fuel ratio presuming circuit 6 through an amplifier 4 and a peak holding circuit 5. The circuit 6 individually presumes the air-fuel ratio on its lean and rich sides from a map on the maximum value of cylinder pressure. A signal from a throttle sensor 2, one obtained by computing its one difference in grade through an arithmetic circuit 7, one from a car speed sensor 3, one obtained by computing its one difference in grade through an arithmetic circuit 8 and one from an arithmetic circuit 10 for running resistance are inputted into a linear sorter 9 to be weightedly processed there for judging whether the air-fuel ratio is lean or not. A presumed air-fuel ratio is decided on the result of the above-mentioned judgment, and teaching circuit 12 thereby judges the correctness of the result of control for learning the coefficient of weighting in the linear sorter 9. |
