| 摘要 |
PURPOSE:To eliminate the temporary too rich condition of mixture and prevent misfiring or the like by a method wherein a porous pipe is arranged in a suction air path and a shutter valve which is closed upon decelerating operation is provided at the downstream end of the inside of the porous pipe in order to supply the fuel in the porous pipe gradually into a combustion chamber upon the decelerating operation of the engine. CONSTITUTION:When a throttle valve 8 is closed in order to shift the accelerating or constant speed operation of the engine into the decelerating operation, vacuum in the suction air path 4 is increased and fuel, adhered to the internal surface 11a of the porous pipe 11, is tried to suck it into the combustion chamber by one effort. At this time, a valve opening signal (a) is outputted from a control unit 17 to a vacuum control valve 16 based on the valve closing signal (b) from a throttle valve opening degree sensor 18. According to this method, the suction vacuum is introduced into the vacuum chamber 14a of a driving device 14 and the shutter valve 13 is closed through a diaphragm 14c and a rod 14d. Accordingly, the fuel adhered to said internal surface 11a is precluded from being sucked into the combustion chamber 3 directly. Then, the fuel is sucked out of the fine holes of the porous pipe 11 gradually and induced into the combustion chamber step by step in a small amount. |
