| 摘要 |
PURPOSE:To prevent the increase of NOx in exhaust gas and the lowering of acceleration performance as well as improve fuel cost by controlling an engine such that an air fuel ratio is a theoretical one when detecting the acceleration state of the engine even in a prescribed light load region. CONSTITUTION:A control circuit 20 corrects to increase an output when a basic injection amount Tp evaluated from the number of engine revolutions, the amount of intake air and constants is more than a first set value Tpbeta. If small, it is compared with a second set value Tpalpha, if larger than Tpalpha, a correction by feedback control is conducted. If less than Tpalpha, it is evaluated with the previous processing. Further, said control circuit compares a basic injection amount Tpn-1 stored in a RAM206 with the preset basic one Tpn, and corrects to decrease the injection amount if Tpn is less than Tpn-1, thus allowing an air fuel ratio being leaner than a theoretical one. If the present basic injection amount is larger than the previous one, i.e., at acceleration, feedback control is conducted, and open rule control is not conducted, so that it is possible to prevent the lowering of the acceleration and NOx and improve fuel cost. |
