Control system for in-cylinder direct injection engine

摘要

In a control system A for an in-cylinder direct injection engine, during idling operation, the fuel injection timing is compensated to the advance side for each cylinder 2 so that the rate -of change in crank angular velocity becomes smaller than a preset criterion while the fuel injection pressure of an injector 18 is gradually reduced from a reference target fuel pressure to a preset lower limit. If the rate of change in crank angular speed becomes smaller than the criterion as a result of the above compensation, the fuel injection timing is compensated to the retard side so that the rate of change in crank angular velocity becomes smaller while the fuel pressure is gradually increased to the preset upper limit. Consequently, the unbalance of fuel spray and tumble due to deviations of fuel spray penetration and the like can be eliminated thereby providing suitable mixture stratification. <IMAGE>