PURPOSE: To control a fuel injection quantity and ignition timing in optimum conditions, by installing a phase control device carrying out a phase lead for a suction pipe pressure signal, a fuel injection quantity control device regulating the fuel injection quantity and an injection timing control device controlling the ignition timing.

CONSTITUTION: A phase control device carries out a specified phase lead process for a suction pipe pressure signal to be detected by a pressure sensor. An output signal out of a phase control device is inputted into a fuel injection quantity control device controlling a fuel injection quantity, while an input signal to the phase control device is inputted into an ignition timing control device controlling the ignition timing. Thus, the fuel injection quantity and the ignition timing both are controllable in optimum conditions on the basis of suction pipe pressure.