| 摘要 |
PURPOSE:To prevent a fuel-air mixture from diluting, by a method wherein an injection quantity is fixed to a predetermined point in case a detecting value of a suction quantity is clamped at its detectable maximum value by lowering battery voltage to be fed to hot-wire type air flow meter. CONSTITUTION:A suction quantity signal Q by a hot-wire type air flow meter, an ignition signal SF from an ignition coil and a water temperature signal SW are applied to an operating circuit 1, and a basic fuel injection quantity TP is computed through a number of revolutions N of an engine to be obtained by the suction quantity signal Q and the ignition signal SF first of all in a basic injection quantity operating circuit 12. The injection quantity TP is applied to a fuel injection valve driving circuit 5 through a directional control circuit 17 after correction by a correcting circuit 13 through a water temperature signal SW. On this occasion, the suction quantity signal Q is compared 16 with a reference value Vr varying corresponding to a change of the maximum output value of the air flow meter 2 and a fixed pulse signal PC by a fixed pulse generator 14 is applied to a driving circuit 5 by changing the direction control circuit 17 when the signal Q is in Q>=Vr. |
