| 摘要 |
PURPOSE:To accurately set a compensation value for the air-fuel ratio of an engine, by providing a means for generating the compensation value on the basis of the value of the control signal of a feedback control means at the time of the inversion of the signal and the direction of the change of the signal before the inversion. CONSTITUTION:A basic fuel injection quantity calculation circuit 21 computes a basic fuel injection quantity in terms of the intake air quantity signal of an air flow sensor 5 and the engine rotational frequency signal of a rotational frequency sensor 14. A microcomputer 22 sets a compensation value depending on the signal of the sensor 14, the oxygen concentration signal of an O2 sensor 10 and the throttle opening degree signal of a throttle opening degree sensor 12. A compensation circuit 23 compensates the basic fuel injection quantity by the compensation value. As a result, the compensation value for the air-fuel ratio of the engine can be accurately set in a short time after feedback control is ceased. |
