Patent ID: 7503303
Filing Date: 2009-03-17
Classification: F02B,F02M,Y02T

Abstract:
1. A variable air intake control system comprising: an intake passage having a first air intake passage portion and a second air intake passage portion to supply air to an engine; first and second variable intake control valves arranged between the first and second intake passage portions to selectively open and close communication between the first and second intake passage portions; a vacuum tank configured and arranged to store negative pressure; first and second actuators operatively coupled between the vacuum tank and the first and second variable intake control valves, respectively, to independently drive each of the first and second variable intake control valves between an open state and a closed state using the negative pressure in the vacuum tank; a one-way valve arranged between the vacuum tank and the intake passage to selectively establish communication between the vacuum tank and the intake passage; and a controller is configured to control the first and second actuators to offset operating timings of the first and second variable intake control valves so as to suppress the noise in the one-way valve, when the first and second variable intake control valves are switched from a first operating state in which the first and second variable intake control valves are both in one of the open and closed states to a second operating state in which the first and second variable intake control valves are both in one of the open and closed states that is opposite to the first operating state.