Pump enable system and method
AssigneeGrove U.S. L.L.C.
InventorsRobert D. Backer, David Alan Hall, Robert William Johnston
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Abstract
A pump enable system includes a variable-displacement piston pump having a displacement control device. The displacement control device controls displacement of pistons in the pump based on a position thereof, and a position control system in the pump controls a position of the displacement control device based on a load on the pump. An over-ride system selectively over-rides the position control system such that the displacement control device assumes a position which reduces displacement of the pistons in the pump.
Claims15
A pump enable system, comprising:
- a variable-displacement piston pump having a displacement control device, said displacement control device controlling displacement of pistons in said pump based on a position thereof, and a position control system for controlling said position of said displacement control device based on a load on said pump;
- and
- an over-ride system for selectively over-riding said position control system such that said displacement control device assumes a position which reduces displacement of said pistons in said pump, said over-ride system including an electrically controlled valve that selectively redirects hydraulic pressure in said position control system such that said displacement control device assumes a position which reduces displacement of said pistons in said pump.
A method of enabling a variable-displacement pump, said pump including a displacement control device controlling displacement of pistons in said pump based on a position thereof and a position control system for controlling a position of said displacement control device based on a load on said pump, said method comprising:
- selectively over-riding said position control system such that said displacement control device assumes a position which reduces displacement of said pistons in said pump, wherein said over-riding step includes operating an electrically controlled valve so as to selectively redirect hydraulic pressure in said position control system such that said displacement control device assumes a position which reduces displacement of said pistons in said pump.
Dependencies are inferred from the claim text.