Electro-hydraulic servovalve control with input
AssigneeWoodward, Inc.
InventorsBryan R. Haack, Sharwari Kulkarni
Life of this patent
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Abstract
The subject matter of this specification can be embodied in, among other things, a controller apparatus that includes a digital controller configured to provide a digital position signal based on a setpoint and a differential analog feedback signal, and a converter circuit configured to provide a differential analog electrohydraulic servo valve position control signal based on the digital position signal, and provide the differential analog feedback signal based on the differential analog electrohydraulic servo valve position control signal.
Claims20
A controller apparatus, comprising:
- a digital controller configured to provide a digital position signal based on a setpoint and a differential analog feedback signal;
- and
- a converter circuit configured to provide a differential analog electrohydraulic servo valve position control signal to an electrohydraulic servo valve based on the digital position signal, and provide a portion of the differential analog electrohydraulic servo valve position control signal as the differential analog feedback signal.
A method of position control comprising:
- receiving a predetermined setpoint;
- receiving a differential analog feedback signal;
- determining a digital position signal based on the received predetermined setpoint and the received differential analog feedback signal;
- providing the determined digital position signal;
- determining a differential analog electrohydraulic servo valve position control signal based on the digital position signal;
- and
- providing a portion of the differential analog electrohydraulic servo valve position control signal as the differential analog feedback signal.
A control system comprising:
- a conversion apparatus;
- a controller configured to perform operations comprising:
- receiving a setpoint;
- receiving a first analog feedback signal from the conversion apparatus;
- receiving a second analog feedback signal from the conversion apparatus;
- determining a differential analog feedback signal based on the received first analog feedback signal and the received second analog feedback signal;
- and
- providing a digital position control signal based on the received setpoint, and the determined differential analog feedback signal;
- an electrohydraulic servo valve configured to receive a differential analog electrohydraulic servo valve position control signal, comprising a first analog control signal and a second analog control signal, from the conversion apparatus;
- and
- the conversion apparatus comprising circuitry configured to perform operations comprising:
- receiving the digital position control signal;
- determining the first analog control signal based on the provided digital position control signal;
- determining the second analog control signal based on the provided digital control signal;
- providing the determined first analog control signal and the determined second analog control signal to the electrohydraulic servo valve;
- providing the first analog feedback signal to the controller based on the determined first analog control signal;
- and
- providing the second analog feedback signal to the controller based on the determined second analog control signal.
Dependencies are inferred from the claim text.