Variable pressure limiting for variable displacement pumps
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United States of America Patent
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Aug 16, 2016
Grant Date -
Sep 24, 2015
app pub date -
Mar 24, 2014
filing date -
Mar 24, 2014
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Abstract
Method of controlling multiple variable displacement hydraulic pumps determined relative to operator commands. If non-second-pump-dominated command, a respective adjusted displacement request is determined based upon the lesser of the operator requested torque limited displacement and an adjusted torque limited displacement that calculated based upon and the torque limited displacement of the respective pump and a scaling factor calculated based upon the first relief valve set pressure and respective pump pressure. If second-pump-dominated command, the set pressure of a relief valve associated with one of the pumps is instead utilized in calculating the scaling factor in the above strategy.
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