| 摘要 |
PURPOSE:To prevent the occurrence of knocking during engine starting, by installing a throttle device, controlling a suction quantity, in a suction passage at the downstream of a suction expansion chamber, and controlling this throttle device in the suction quantity decreasing direction at the time of engine cranking. CONSTITUTION:A suction passage 19 is provided with a throttle valve 18 and a surge tank 14 or the like in order from the upstream side, and a suction passage proximate to a suction port 8 is divided into a small pass sectional areal primary suction passage 21 for swirl formation and a large pass sectional areal secondary suction passage 22 at the downstream of this surge tank 14. And, there is provided with a fuel injection valve 24 as making it point to a converging part of both these suction passages 21 and 22. In this case, a shutter valve 23 being controlled by a solenoid actuator 25 and a vacuum actuator 28 is installed in the secondary suction passage 22. And, at the time of engine cranking, the shutter valve 23 is closed by actuation of this solenoid actuator 25, thereby making suction so as to be done from the primary suction passage 21 alone.
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