| 摘要 |
PURPOSE:To improve control accuracy in time of transient operation, by judging a progress degree of learning at every operating region and, on the basis of the judgment, interpolatively calculating a learning value at the operating region being small in the learning progress degree from another learning value at an operating region being large in the learning progress degree in and around the operating region. CONSTITUTION:In the case where an operating region is carried in an arrow direction, when it exists in an unlearned region (a), both upper and lower learning regions A and B are searched for, then a learning compensation factor alpha0 at both these regions A and B is read out, calculating the learning compensation factor alpha0 at the unlearned region by means of proportional interpolation, whereby an injection quantity Ti is calculated. A driving pulse signal commensurate to this injection quantity is given to a fuel injection valve 22 at the specified timing via a current waveform control circuit 21, and such an estimated learning compensation factor as being high in reliability is used even for the unlearned region, thus injection quantity control takes place. With this constitution, a step difference in an air-fuel ratio between these learning and unlearning regions is brought to nothing at all, thus exhaust emission in a transient state is prevented from getting worse. |
