Patent ID: 8742714
Filing Date: 2014-06-03
Classification: G05B

Abstract:
1. A method for tracking a position of a component driven by an electric motor, the method comprising: detecting rotational movements of the electric motor with a sensor generating an impulse signal; using the impulse signal to increment a position count, the position count corresponding to an expected position of the driven component; determining an occurrence of an uncertainty in the position count by detecting deviations of the sensed impulse signal from an expected impulse signal pattern, the expected impulse signal pattern corresponding to historical sensed impulse signals or a reference impulse signal pattern stored in a memory; using each occurrence of an uncertainty to increment an uncertainty count corresponding to an uncertainty region; combining the uncertainty region with the expected position of the driven component corresponding to the current position count; and maintaining both the position count and the uncertainty count for use in estimating the actual position of the driven component.