| 摘要 |
PURPOSE:To prevent an air-fuel ratio from being overrich, by carrying out an increase in quantity after engine starting and an air-fuel ratio compensation in time of idling, while stopping the air-fuel ratio compensation at the idle in time of the starting increment, in case of a method to proeperly compensate for the basic injection quantity in accordance with a state of engine rotation. CONSTITUTION:In a digital control circuit 54, the basic injection time is read out of a read-only memory on a basis of both the suction pipe pressure by a suction pipe pressure sensor 23 and the engine speed by a crank angle sensor 44 whereby injection 30 is controlled. In this case, after engine starting, a fuel increment compensation is carried out in accordance with a coefficient of compensation read out according to the warm-up state by a water temperature sensor 46 and then the compensation is attenuated after the lapse of the specified time. Likewise, at the time of idling, the increase and decrease compensation of fuel is carried out according to the coefficient of compensation being varied with the suction pipe pressure and the change of engine speed. And, at this time, during the performance of increasing in quantity after the former's starting, this method causes the latter so as not to carry out the air-fuel ratio compensation in time of idling. |
