| 摘要 |
PURPOSE:To improve re-accelerating performance of an internal combustion engine, by preventing over-enriching of air-fuel mixture by connecting an atmosphere inlet pipe to a suction pipe of the engine in the vicinity of the inlet to a cylinder, and providing valves for opening or closing either one of the atmosphere inlet pipe and the suction pipe to introduce atmosphere from the atmosphere inlet pipe at the time of decelerating the engine. CONSTITUTION:An atmosphere inlet pipe 7 is connected to a suction pipe 2 of an engine 1 in the vicinity of the inlet to a cylinder. Further, a suction pipe shut- off valve 8 and an atmosphere inlet pipe shut-off valve 9 are provided for opening or closing either one of the atmosphere inlet pipe 7 and the suction pipe 2. A control circuit 11 is furnished with output signals of a throttle switch 12 and an ignitor 13 and also furnished with an idle opening signal of a throttle valve. When an engine-speed signal higher than a prescribed value is applied to the control circuit 11, judgement is made that the engine is under deceleration, and the control circuit 11 applies a signal to a electromagnetic solenoid 10 to shut off supply of air-fuel mixture by closing the valve 8 and to introduce atmosphere by opening the valve 9. With such an arrangement, it is enabled to retain air-fuel mixture when the accelerator pedal is released, to lower the specific fuel consumption and to improve the re-accelerating performance of the engine. |
