Patent ID: 6553964
Filing Date: 2003-04-29
Classification: F01L,F02B,F02D,Y02T

Abstract:
A system for controlling an intake air amount of an engine, the engine having a combustion chamber provided with an intake valve together with an intake manifold provided with a throttle valve, the system comprising:a control unit configured to perform an unthrottled intake air control in which the intake air amount supplied to the combustion chamber is controlled by varying a valve timing of the intake valve with a boost pressure within the intake manifold maintained substantially constant by adjusting a throttle position of the throttle valve, wherein a delay is provided equivalent to a time constant due to a volume within the intake manifold downstream of the throttle valve to the varying valve timing of the intake valve for the unthrottled intake air control and the adjusting throttle position of the throttle valve for the unthrottled intake air control.