Method and apparatus for controlling multiple variable displacement hydraulic pumps
US8935009B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2011 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | May 19, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/03
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for controlling discharge pressure and pump displacement of a plurality of variable displacement hydraulic pumps having connected discharge ports is provided. Each pump includes a swashplate and a control valve for controlling an angle of inclination of the swashplate. A desired first pump displacement control law is determined for a first pump and determined a desired second pump discharge pressure control law for a second pump. The first control law is used to determine a first intermediate control variable. The second control law is used to determine a second intermediate control variable. The control of the first and second pumps are combined using the first and second intermediate control variables. A desired first control valve setting for the control valve of the first pump is determined using the combined first and second intermediate control variables and the first control law. A desired second control valve setting for the control valve of the second pump is determined using the combined first and second intermediate control variables and the second control law.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.