| 摘要 |
PURPOSE:To promote atomization and vaporization of fuel in a system wherin fuel is injected from a fuel injection valve installed in an intake port in the substantially rear half of the suction stroke at the lower load time or the similar time by compensating an injection timing to a faster timing when an engine is cool. CONSTITUTION:In operation of an engine, CPU15 reads and stores each signal of a pressure sensor 8, a water temperature sensor 9, a crank angle sensor 10 and an ignition switch 11. CPU15 first computes a reference injection quantity from an engine rpm and suction negative pressure and thereafter determines whether the temperature of cooling water is lower than the preset value or not, that is, whether the operation is the starting operation of a cool engine or not. If CPU determines YES, an injection start timing thetaio is set to the timing at which a crank comes to the specified angular position, and the reference injection quantity is compensated to provide an actual injection quantity according to the temperature of cooling water. An injection angle theta is determined from the actual injection quantity and an injection completion timing thetaic is then determined from theta and said thetaio. |
