4-STROKE ENGINE CONTROL DEVICE AND CONTROL METHOD

The atmospheric pressure is detected from an intake pressure immediately before intake stroke, and the pressure difference between fuel pressure fed to an injector and intake pressure is determined. A fuel injection coefficient (Q t) is calculated by dividing the fuel injection time coefficient (Q t0) per unit mass by the square root (P 1>>2>) of injection fuel pressure, for computing fuel injection time for achieving desired air-fuel ratio.