Fast response load sense control system

Details Fast response load sense control system Fast response load sense control system

1989-06-05

1991-01-22

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60427, 60450, F15B 1312

Patent

active

049860712

ABSTRACT:
A source of pressurized hydraulic fluid has a variable fluid output rate and a control system which varies the fluid output rate responsive to a load sense control signal, e.g., a variable displacement pump. The pressurized fluid is made available to a plurality of hydraulic actuators through a corresponding plurality of work control valves. A load sense line is utilized to sense the pressure of the fluid in each hydraulic actuator and to apply a total load sense signal to the control system. A conduit containing a pressure reducing valve provides fluid communication between the output of the source of fluid and the load sense line to pass fluid therethrough to the load sense line only when the pressure in the load sense line is less than a predetermined value. Maintaining at least this minimum pressure in the load sense line minimizes lag in the load sense signal which would otherwise occur as a result of the loss of fluid in the load sense line due to the bleeding of the load sense line.

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