Multi-pump system with pump-flow diversion

摘要

A work vehicle has a pump group with two fixed-displacement pumps, an electro-hydraulic diverter openable to divert flow from one of the pumps to a fluid reservoir, and a controller configured to command the diverter to open.

主权项

1. A work vehicle comprising
a fluid reservoir, a pump group comprising a fixed-displacement first pump and a fixed-displacement second pump such that the first and second pumps are flow-parallel to one another, an actuator, an open-center directional control valve positioned fluidly between the pump group and the actuator, an electro-hydraulic diverter coupled fluidly to a point between the second pump and the directional control valve and to the fluid reservoir to divert flow from the second pump to the fluid reservoir when the diverter is opened, a speed sensor positioned to sense a speed parameter of the work vehicle or an operator input device configured for manual selection of a diversion setting independent of any seat position of the work vehicle, and a controller configured to
receive a speed signal indicative of the speed parameter or a diversion setting signal indicative of the selected diversion setting,determine if the speed parameter satisfies predetermined speed criteria or determine a state of the selected diversion setting, andcommand the diverter to open if the speed parameter satisfies the predetermined speed criteria or if the selected diversion setting is in a flow-diversion state.