ENGINE INTAKE CONTROL DEVICE

In an intake-air amount control system for an engine, a joint surface ( 28f, 211f) of a control block ( 28) is coupled to a mounting surface (27f) formed on a throttle body (17) in parallel to an intake passage (17a), and a bypass upstream groove (32i) communicating with an upstream portion of the intake passage 17a) and a bypass downstream groove (32o) communicating with a downstream portion of the intake passage (17a) are defined in at least one of the surfaces (27f, 28f). A valve bore (34) is provided in the control block (28) to permit the communication between the bypass upstream groove (32i) and the bypass downstream groove (32o), and a bypass valve (25) provided in the valve bore (34) and an actuator (28) for the bypass valve (25) are disposed in a device block (11) in parallel to the intake passage (17a). Thus, the workability and the assemblability can be enhanced, while enabling the intake-air amount control system for the engine including the bypass valve and the actuator to be constructed compactly.