JPH0577845B

PURPOSE:To reduce a torque shock produced at the opening time of an intake air controlling valve in an engine containing said valve which can be opened only when a vehicle runs at high speed over a set value by resetting the value to a lower one and opening the intake air controlling valve by use of the new value if the vehicle is accelerated over a specified ratio. CONSTITUTION:Two intake valves 3 and 4 are provided for each of cylinders 2 and have a primary and a secondary passage 7a and 7b, respectively. The primary passage 7a contains a fuel injection valve while the secondary passage 7b contains an intake air controlling valve 11. A controller 8 senses revolutional speed 20, intake quantity 14 and opened degree 19 of a throttle valve and has an actuator 13 open and close the intake air controlling valve 11. When an engine is accelerated quickly, the controller 18 loweres a set value which is usually used for the opening time of the controlling valve 11, and opens the valve earlier. Since an intake air condition suitable for a high-speed revolution of an engine is be prepared, an intake system will be able to make an attack to any quick change in r.p.m of an engine at a quick acceleration time thereof.