Fault detection and correction in valve assemblies

摘要

A method of controlling a valve assembly includes calculating, by a controller of the valve assembly, one or more electrical signals to move a valve element of the valve assembly dependent on an actual and a desired position of the valve element. The method also includes sending, by the controller, the one or more electrical signals to an electrical actuator of the valve assembly. The method further includes detecting a valve fault condition defined as the actual position of the valve element failing to match the desired position of the valve element after a configurable period has elapsed. When the valve fault condition is detected, the method includes substituting the data corresponding to the desired position of the valve element with pulses of waveform data which oscillate about a value corresponding to the desired position of the valve element until either of two predetermined conditions is met.

主权项

1. A method of controlling a valve assembly, the valve assembly including:
a valve element movable between an open stop and a closed stop, wherein a position of the valve element between the open stop and the closed stop establishes an extent to which a valve of the valve assembly is open; an electrical actuator for moving the valve element in response to an electrical signal; a position sensor for detecting an actual position of the valve element; a controller configured to receive data corresponding to a desired position of the valve element and to supply a calculated electrical signal to the electrical actuator in order to effect movement of the valve element from the actual position of the valve element to the desired position of the valve element; the method comprising the steps of:
calculating, by the controller, one or more electrical signals to move the valve element dependent on the actual and desired positions of the valve element;sending, by the controller, the one or more electrical signals to the electrical actuator;detecting a valve fault condition defined as the actual position of the valve element failing to match the desired position of the valve element after a configurable period has elapsed; andwhen the valve fault condition has been detected, substituting the data corresponding to the desired position of the valve element with one or more pulses of waveform data that oscillate about a value corresponding to the desired position of the valve element until either:
the actual position of the valve element matches the desired position of the valve element to within an allowable valve position margin; ora preconfigured number of pulses has been reached.