INTAKE DEVICE FOR ENGINE

PURPOSE:To obtain a high traction effect by providing an intake air flow rate changing means in an engine in which two throttle valves are disposed in series in an intake passage, and controlling this means in accordance with an opening degree of one of the throttle valves which is associated with the operation of an accelerator pedal. CONSTITUTION:In an engine incorporating an intake device in which a first throttle valve 17 opened and closed in association with the operation of an accelerator pedal 6 and a second throttle valve 13 opened and closed independent from the first throttle valve 17 are disposed in series in an intake passage 9, a bypass passage 20 bypassing the first throttle valve 17 (or the second throttle valve 13) is provided, and an intake air flow rate changing means 20 for changing the flow rate of intake air, in the passage 20. A control means 43 controls the changing means 21 in accordance with an output from a throttle opening degree detecting means 34 for detecting an opening degree of the first throttle valve 17. Thereby it is possible to compensate the flow rate of intake air for an insufficiency thereof even though interference of the intake air flow rate is present when the opening degrees of the throttle valves are small.