Agricultural System
AssigneeDawn Equipment Company
InventorJoseph D. Bassett
Life of this patent
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Abstract
A hydraulic control system for controlling the down force on an agricultural implement comprises a hydraulic cylinder containing a movable ram, a source of pressurized fluid coupled to the hydraulic cylinder on a first side of the ram by a first controllable valve, a fluid sump coupled to the hydraulic cylinder on the first side of the ram by a second controllable valve, and an electrical controller coupled to the valves for opening and closing the valves. The valves may be self-latching valves that remain in an open or closed position until moved to the other position in response to a signal from the controller.
Claims6
1-21. (canceled)
A hydraulic control system for controlling the down force on an agricultural implement, comprising
- a hydraulic cylinder containing a ram,
- a source of pressurized fluid coupled to said hydraulic cylinder on a first side of said ram by a first controllable valve,
- a fluid sump coupled to said hydraulic cylinder on said first side of said ram by a second controllable valve,
- an electrical controller coupled to said first and second controllable valves for opening and closing said first and second controllable valves,
- a pair of energy storage devices coupled to said hydraulic cylinder on opposite sides of said ram, and
- a check valve coupling said hydraulic cylinder to said energy storage device.
A hydraulic control system for controlling the down force on an agricultural implement, comprising
- a hydraulic cylinder containing a ram,
- a source of pressurized fluid coupled to said hydraulic cylinder on a first side of said ram by a first controllable valve,
- a fluid sump coupled to said hydraulic cylinder on said first side of said ram by a second controllable valve, and
- an electrical controller coupled to said first and second controllable valves for opening and closing said first and second controllable valves.
- a pressure transducer coupled to said hydraulic cylinder on one side of said ram,
- a down pressure controller for controlling the down pressure on at least a portion of the implement, and
- a load sensor comprising
- a mechanical element mounted for movement in response to the downward force applied to the implement,
- a fluid-containing device containing a element coupled to said mechanical element for changing the fluid pressure in response to the movement of said mechanical element, and
- a transducer coupled to said fluid-containing device for producing an output signal in response to changes in said fluid pressure.
Dependencies are inferred from the claim text.