Invention Grant
- Patent Title: Variable pressure limiting for variable displacement pumps
- Patent Title (中): 可变排量泵的可变压力限制
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Application No.: US14223698Application Date: 2014-03-24
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Publication No.: US09416779B2Publication Date: 2016-08-16
- Inventor: Corey L. Gorman , Adam Nackers , Jeremiah C. Johnson , John J. Krone
- Applicant: Caterpillar Inc.
- Applicant Address: US IL Peoria
- Assignee: Caterpillar Inc.
- Current Assignee: Caterpillar Inc.
- Current Assignee Address: US IL Peoria
- Agent Jeff A. Greene
- Main IPC: E02F9/22
- IPC: E02F9/22 ; F04B49/06 ; F04B49/08 ; F04B49/22

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.
Public/Granted literature
- US20150267697A1 Variable Pressure Limiting for Variable Displacement Pumps Public/Granted day:2015-09-24
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