Patent ID: 6642712
Filing Date: 2003-11-04
Classification: G01D

Abstract:
A method for predicting a plurality of rotational positions of a rotating shaft upon a detection of a change in a rotational speed of the rotating shaft from a first speed to a second speed, the plurality of rotational positions including a plurality of incremental rotational positions of the rotating shaft, said method comprising:predicting a first rotational position of the rotating shaft as a function of the first speed in response to the first detection of the change in rotational speed of the rotating shaft; determining a first incremental rotational position of the rotating shaft that succeeds the first rotational position as predicted; estimating a time interval between the first rotational position as predicted and the incremental rotational position as determined; estimating a prediction slope as a function of the time interval as estimated, and a differential between the first rotational position as predicted and the incremental rotational position as determined; and generating a continuous prediction of the plurality of rotational positions of the shaft rotating at the second speed as a function of the prediction slope as estimated.