Hydraulic system having variable back pressure control

Details Hydraulic system having variable back pressure control Hydraulic system having variable back pressure control

2007-05-01

2007-05-01

Kershteyn, Igor (Department: 3745)

Power plants

Pressure fluid source and motor

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

C060S433000, C060S459000

Reexamination Certificate

active

11092617

ABSTRACT:
A hydraulic system for a work machine having a linkage system is disclosed. The hydraulic system has a tank configured to hold a supply of fluid and at least one hydraulic actuator associated with the linkage system to affect movement of the linkage system. The at least one hydraulic actuator has a first pressure chamber and a second pressure chamber. The hydraulic system also has an independent metering valve associated with the first pressure chamber. The independent metering valve has a valve element movable between a first position at which fluid communication between the first pressure chamber and the tank is blocked, and a second position at which fluid is allowed to drain from the first pressure chamber to the tank. The hydraulic system further has at least one sensor configured to sense a parameter indicative of a pressure in the second pressure chamber, and a controller in communication with the independent metering valve and the sensor. The controller is configured to move the valve element of the independent metering valve in response to the pressure.

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