Valve control with indeterminant starting state

Abstract

A valve control system includes a rotatable valve operably coupled to a motor, a valve position indicator configured to rotate with the rotatable valve, at least two sensing devices configured to detect the valve position indicator, and a controller. The at least two sensing devices include a home position sensing device and an end-of-travel position sensing device. The controller includes valve state determination logic having circuitry configured to monitor a status of a home indicator and an end-of-travel indicator of the rotatable valve, determine a commanded direction of movement of the rotatable valve, monitor the status of the home indicator and the end-of-travel indicator before a valve rotation stop is commanded and after the valve rotation stop is commanded, and determine a current state of the rotatable valve based on the commanded direction of movement and at least one of the status of the home indicator and the end-of-travel indicator.

Dependencies are inferred from the claim text.