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US 2009/0255246 A1Published application
Hydraulic system including open loop and closed loop valve control schemes
AssigneeEaton Corporation
InventorsDuqiang Wu, G. Clark Fortune, Aaron H. Jagoda, John R. Kess, Thomas J. Stoltz, Paul Brenner, Benjamin Morris
Life of this patent
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Abstract
An exemplary hydraulic system includes a digital valve operable to fluidly connect a hydraulic load to a pressure supply. A digital controller is operably connected to the digital valve. The digital controller stores a target value of a hydraulic system operating parameter and is configured to formulate a pulse width modulated control signal based on the target value. The digital controller transmits the control signal to the digital valve for controlling the operation of the valve.
Claims18
A method comprising:
- selecting a target value for a hydraulic system operating parameter;
- formulating a pulse width modulated control signal based on the target value;
- transmitting the control signal to a valve operable to selectively fluidly connect a hydraulic load to a pressure source;
- and
- operating the control valve in response to the control signal.
2 more elements
A hydraulic system comprising:
- a digital valve operable to fluidly connect a hydraulic load to a pressure supply;
- and
- a digital controller operably connected to the digital valve, the digital controller storing a target value of a hydraulic system operating parameter, the digital controller configured to formulate a pulse width modulated control signal based on the target value, the digital controller transmitting the control signal to the digital valve for controlling the operation of the valve.
Dependencies are inferred from the claim text.