Multi-function wheel loader linkage control with optimized power management
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United States of America Patent
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Dec 25, 2012
Grant Date -
Mar 8, 2012
app pub date -
Sep 8, 2010
filing date -
Sep 8, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic system for an earth-moving vehicle may include first and second hydraulic cylinders, first and second hydraulic pumps and control valves including a combiner valve to modulate hydraulic fluid and pressure from the first and second hydraulic pumps to the first and second hydraulic cylinders as appropriate for the task being performed. If the task is digging, the first and second cylinders may be associated with tilting and lifting, respectively, and the control valves may be oriented so as to make each pump dedicated to one of the cylinders, and if demand is not being met, to then diminish power to the drivetrain to allow the tilting and lifting to be performed. The combiner valve may or may not be open during this time. If the task is not digging, the combiner valve can be opened to allow for cross-flow between the pumps and the cylinders.
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