| 摘要 |
PURPOSE:To carry out control of air-fuel ratio, by a method wherein the gain variation of air-fuel ratio is inhibited by controlling the driving cycle of a fuel supply device. CONSTITUTION:An ignition cycle is detected in an ignition cycle detecting circuit 2 by an ignition signal from an ignition signal generator 1. At the time of generation of the ignition signal, air-fuel ratio is discriminated whether it is rich or lean, by comparing the output of an O2 sensor 3 by a comparator 5 with the output of a comparison voltage generating part 4. Then, the output of a register 6 at the time when it is discriminated as rich and the output of a complement computing circuit 7 at the time when it is discriminated as lean are selected by a directional control switch 8 and applied to an adder 9. Although the adder 9 constitutes an integrator together with a register 10 applying the output of a delay circuit 11, an injection valve 16 is made to control by a method wherein the output of the integrator is multiplied 12 next by the output of the above ignition cycle, the product of which is applied to a timer 14 as the output of an injection cycle and an injection timing is computed by the output of the injection cycle and the output of an injection pulse width computing circuit 13. |
