Method and system for controlling a valve device

Details Method and system for controlling a valve device Method and system for controlling a valve device

2007-03-28

2009-06-23

Vo, Hieu T (Department: 3747)

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

C123S361000

Reexamination Certificate

active

07549407

ABSTRACT:
A system and method are disclosed for controlling the positioning of a movable member of a valve device by an electric actuator. A model is used to generate estimates for the position and velocity of the movable valve member that result from an actuator control signal being applied to drive the electric actuator. The actuator control signal comprises a feedback control signal combined with a feedforward control signal. The feedback control signal is generated based upon a difference between the estimated and actual positions of the movable valve member, while the feedforward control signal is generated based upon the desired position, the estimated position, and the estimated velocity. The feedforward signal is adjusted to cause the estimated velocity to approximately follow a defined maximum deceleration velocity trajectory as the estimated position of the movable valve member moves to the desired position. An exemplary embodiment is presented where the principles of the invention are applied to the control of an electronic throttle valve.

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