Patent ID: 7549407
Filing Date: 2009-06-23
Classification: F02D

Abstract:
1. A system for controlling a throttle valve, the throttle valve having a throttle plate positioned by an electric motor for opening and closing the throttle valve, the system comprising: an accelerator pedal position sensor providing a desired position signal indicative of a desired position for the throttle plate; a throttle valve position sensor providing an actual position signal indicative an actual position for the throttle plate; a control unit receiving the actual and desired position signals and programmed to: (a) generate a simulated position signal and a simulated velocity signal based upon a simulated motor control signal, the simulated position and simulated velocity signals respectively representing an estimated position and estimated velocity for the throttle plate that would result from the simulated motor control signal being applied to drive the electric motor; (b) generate a feedforward control signal based upon the desired position signal, the simulated position signal, and the simulated velocity signal, wherein the simulated motor control signal comprises the feedforward control signal; (c) generate a feedback control signal based on a difference between the simulated and actual position signals for the throttle plate; (d) combine the feedforward control signal and the feedback control signal to produce a motor control signal; and (e) apply the motor control signal to drive the electric motor, whereby the throttle plate is controlled to move from the actual position to the desired position.