Patent ID: 8466637
Filing Date: 2013-06-18
Classification: G03B,G05B,H02N

Abstract:
1. A method for controlling a moveable element, the method comprising: generating and providing with a control device one or more driving signals to one or more positioning actuators to move the moveable element towards a target position based on a target travel distance and a calibration value; determining with a position sensor and the control device when a post-movement position of the moveable element is outside of a tolerance range of the target position; determining with the control device when a current position of the moveable element has overshot the target position as the one or more positioning actuators move the moveable element towards the target position; recalibrating with the control device the calibration value when the post-movement position is determined to be outside of the tolerance range; resetting with the control device the target travel distance when the current position is determined to has overshot the target position, wherein the generating and providing is based on the target travel distance after the resetting and the calibration value after the recalibrating; and repeating with the control device the generating, the determining, the determining, the recalibrating and the resetting as open loop steps until the post-movement position is within the tolerance range.