| 摘要 |
PURPOSE:To promote the early transition of engine speed to a stabilizing range as well as to aim at improvements in drivability, by making an air-fuel ratio variation larger in a rich direction but smaller in a lean direction, respectively, in time of detecting the engine speed variation. CONSTITUTION:In case of a device which regulates an air-fuel ratio in a way of controlling a fuel injection quantity fed out of a fuel injection nozzle 6 with a control signal out of a control unit 7, a speed variation detecting device 12 detecting signals pertaining to engine speed variations upon receiving a signal of a speed sensor 8 is installed in this control unit 7. Then, on the basis of each output signal out of the detecting device 12 and a suction pressure sensor 9, the fuel injection quantity is calculated by a control device 13, while an air-fuel ratio changing device 11 is controlled and regulated so as to keep up the air-fuel ratio to the desired value. This control device 13 is made up of installing a variation variable device which makes an air-fuel ratio variation larger in a rich direction but smaller in a lean direction so variable in time of detecting the engine speed variations by means of the detecting device 12.
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