| 摘要 |
PURPOSE:To improve a fuel cost by providing a means to increase or decrease a fuel volume temporarily when a control target air-fuel ratio is changed for controlling a fuel supply volume of an internal combustion engine precisely. CONSTITUTION:An acute output changing point of an oxygen sensor 23 is moved to a lean air-fuel ratio side according to an electric current sent to the sensor. An air-fuel ratio judging unit 35 judges whether the detected air-fuel ratio is richer or leaner than a control target air-fuel ratio. A means 2 to increase a fuel volume temporarily when the control target air-fuel ratio is switched to the rich side and a means 43 to decrease the fuel volume temporarily when it is switched to the lean side are provided. This construction permits to control the supply volume of the fuel efficiently according to the various air-fuel ratios required. |
