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 based on the digital position signal, and provide the differential analog feedback signal based on the differential analog electrohydraulic servo valve position control 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 the differential analog electrohydraulic servo valve position control signal.
A control system comprising:
- a controller configured to provide a predetermined setpoint and receive a first differential analog feedback signal;
- an electrohydraulic servo valve configured to receive a differential analog electrohydraulic servo valve position control signal;
- and
- a conversion apparatus comprising circuitry configured to perform operations comprising:
- receiving the predetermined setpoint;
- receiving a second differential analog feedback signal;
- determining a digital position signal based on the received predetermined setpoint and the second differential analog feedback signal;
- determining the differential analog electrohydraulic servo valve position control signal based on the determined digital position signal;
- providing the differential analog feedback signal based on the differential analog electrohydraulic servo valve position control signal to the electrohydraulic servo valve;
- determining the first differential analog feedback signal based on the second differential analog feedback signal;
- and
- providing the first differential analog feedback signal to the controller.
Dependencies are inferred from the claim text.