| 摘要 |
PURPOSE:To prevent an engine causing an engine stop by a rapid decrease of a speed due to clutch disconnection or the like when the engine is decelerated, by cutting off fuel when a throttle valve is fully closed with the speed in a predetermined value or more for a fuel cut at deceleration time an restarting supply of the fuel when a decelerative change rate of the speed is in a predetermined value or more. CONSTITUTION:A mixture from a carburetor 1 supplying fuel to an internal- combustion engine 4 is supplied to the engine in accordance with the opening of a throttle valve 14. When the throttle valve opening 15 is fully closed or almost fully closed and when the engine is decelerated at a speed in a predetermined value or more, a control device 9, outputting a fuel cut signal and closing a solenoid operated valve 8 arranged in a fuel passage 7 to a fuel nozzle 2 in the carburetor 1, cuts off fuel. During such deceleration, if a clutch is disconnected and/or a speed shift is placed in a neutral position, the engine, whose speed rapidly decreases, causes an engine stop, but the control device 9, if it detects a change rate of the decrease of this speed being in a predetermined value or more, restarts supply of the fuel. |
