Patent ID: 7997247

Claim:
An engine intake control system comprising: an intake passage body attached to an engine; a first intake passage formed in the intake passage body and having a downstream end connected to an intake port of the engine; a second intake passage also formed in the intake passage body and having a downstream end connected to the intake port; and a changeover valve that includes a valve shaft rotatably supported by the intake passage body, and a valve plate attached to the valve shaft, the valve plate being moved rotationally, by a rotational movement of the valve shaft, between a first changeover position, where the valve plate closes the second intake passage and allows the first intake passage to be connected to the intake port for air flow, and a second changeover position, where the valve plate closes the first intake passage and allows the second intake passage to be connected to the intake port for air flow, wherein the valve plate is a butterfly-type valve plate including first and second valve-plate half portions that extend in opposite directions to each other from the valve shaft, when the valve plate is at the first changeover position, a plate face, which is at one side of the valve plate, forms a part of the first intake passage, and when the valve plate is at the second changeover position, a plate face, which is at the other side of the valve plate, forms a part of the second intake passage.