| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent generation of slippage of air-fuel ratio when injection ratio of an upstream side fuel injection valve and a downstream side fuel injection valve in a system arranging two fuel injection valves in an intake pipe of an internal combustion engine in an position relation of an upstream side and a downstream side. <P>SOLUTION: When injection ratio K1, K2 of a downstream side fuel injection valve and an upstream side fuel injection valve are changed, total injection ratio K1+K2 of the upstream side fuel injection valve and the downstream side fuel injection valve is temporally changed from 100% by retarding change of injection ratio K1 of the downstream side fuel injection valve to injection ratio K2 of the upstream side fuel injection valve and changing the injection ratio K1 of the downstream side fuel injection valve more gently than the injection ratio K2 of the upstream side fuel injection valve. Consequently, total injection quantity of the upstream side fuel injection valve and the downstream side fuel injection valve is temporally changed, temporal fluctuation of cylinder suction fuel quantity due to arrival delay of upstream side injection fuel, and slippage of air-fuel ratio is prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT |
