| 摘要 |
PURPOSE:To secure excellent acceleration drive by providing an electronic control unit which opens valve provided in the branched passage of an inlet port even when the quantity of sucked air is small to increase the filling efficiency immediately after the acceleration. CONSTITUTION:A rotary valve 18 operated by an actuator 30 is inserted into a branched passage 14 of a helical type inlet port 6. In the electronic control unit 50, the acceleration is judged by an output signal of a rotational speed senser 60, an inlet air quantity is obtained by a negative pressure senser 59, and a rotary valve 18 is opened through an atmospheric air communication control valve 36. In this manner, upon the engine acceleration driving the rotary valve 18 is opened even when the quantity of sucked air is small. Therefore, the filling efficiency can be increased immediately after the acceleration, and excellent acceleration drive can be secured. |
