| 摘要 |
PURPOSE:To reduce the amount of combustibles contained in exhaust gas, by causing stratified combustion by injecting fuel independently to each cylinder at the latter half of the suction stroke when an engine is warmed up, and injecting fuel to each group of cylinders at the time other than the suction stroke when the engine is not warmed up. CONSTITUTION:In operation of an engine, comparison is made between the temperature T of cooling water detected by a water temperature sensor 15 and a reference value T0 by an electronic control means 16. In case of T>T0, that is, when the engine is warmed up, injection timing theta1 at the latter half of the suction stroke is calculated, and injection valves 19 are opened when the crank angle theta of each cylinder becomes equal to theta1. On the other hand, in case of T<T0, that is, when the engine is not warmed up, control is made to inject fuel from the injection valves 19 divided, for instance, into two groups once in two turns of the engine when the crank angle theta becomes equal to the injection timing theta2 preset to cause injection of fuel at the time other than the suction stroke. |
