Steuervorrichtung für einen Fremdzündungs-Innenverbrennungsmotor mit Direkteinspritzung

摘要

PCT No. PCT/JP97/02982 Sec. 371 Date Apr. 28, 1998 Sec. 102(e) Date Apr. 28, 1998 PCT Filed Aug. 27, 1997 PCT Pub. No. WO98/09062 PCT Pub. Date Mar. 5, 1998A control apparatus for a cylinder-injection spark-ignition internal combustion engine switches control mode in accordance with an engine operating state between compression stroke injection mode control, in which fuel is injected during the compression stroke to achieve stratified combustion, and suction stroke injection mode control, in which fuel is injected during the suction stroke to achieve uniform mixture combustion. Where regular gasoline lower in octane number than premium gasoline is used, a target mean effective pressure (Pe), which is set in accordance with throttle opening ( theta th), is subjected to octane number-based correction to thereby compensate for an engine output change at the mode switching, whereby a torque shock at the time of mode switching is prevented.