Patent ID: 6334430
Filing Date: 2002-01-01
Classification: F02D

Abstract:
An intake air amount control system for an engine, comprising a plurality of throttle devices each of which comprises a butterfly-type throttle valve rotatably carried in an intake passage body defining an intake passage for controlling the opening degree of said intake passage, said throttle devices being disposed in a pair at each of two points spaced from each other in a direction perpendicular to rotational axes of said throttle valves, said intake passage bodies of said throttle devices disposed at said two points being connected to each other by at least one connecting member, said intake air amount control system comprising bypass air passages provided in opposed sides of said intake passage bodies forming a pair so as to extend around said throttle valves, respectively, air control valves mounted on the opposed sides of said intake passage bodies for controlling the opening degrees of said bypass air passages, respectively, and a synchronizing mechanism disposed between the pair of said throttle devices for synchronizing the operations of said air control valves.