Method of effecting simultaneous displacement changes in hydrostatic drive machine
US8660761B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 2011 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Apr 16, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/462
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method is provided for controlling a gear ratio change in a hydrostatic drive machine. The hydrostatic drive machine includes a variable displacement pump and at least one variable displacement motor fluidly connected with the variable displacement pump. The method includes a step of determining a gear ratio rate of change corresponding to a change from a current gear ratio to a new gear ratio. Start and stop overlap gear ratios corresponding to the gear ratio rate are determined and define an overlap range. The current gear ratio is changed to the new gear ratio using electronic signals at least in part by simultaneously changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios within the overlap range, and sequentially changing displacements of the variable displacement pump and the at least one variable displacement motor at gear ratios outside the overlap range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.