| 摘要 |
An intake air amount control system for an engine includes a plurality of throttle devices each of which is comprised of a butterfly-type throttle valve rotatably carried in an intake passage body and which are disposed in a pair at two points spaced from each other in a direction perpendicular to rotational axes of the throttle valves. The intake passage bodies of the throttle devices disposed at the two points are connected to each other by at least one connecting member. In such intake air amount control system, bypass air passages are provided on opposed sides of the intake passage bodies forming a pair to extend around the throttle valves, respectively, and air control valves mounted on the opposed sides of the intake passage bodies for controlling the opening degrees of the bypass air passages, respectively. A synchronizing mechanism is disposed between the pair of throttle devices for synchronizing the operations of the air control valves. Thus, the idling rotational speed of the engine can be stabilized, while avoiding an increase in size of the intake air amount control system.
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