Method of controlling shifting of two-speed motor
US6827562B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2003 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jun 6, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2/104
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of controlling shifting of a multiple ratio fluid motor (10) between first and second speed ratios. The motor includes a shift valve (61) operable to achieve the second speed ratio by interconnecting recirculating volume chambers (33R). The method includes providing a pressure control valve (75) in communication with a source (73) of pressure fluid, the valve (75) being operable to communicate a pilot pressure to the shift valve in response to changes in a command signal between a first signal (113B) and a second signal (113C). When a shift to the second condition is commanded, the method changes the command signal (113) from the first to the second over a first time (T1). For a shift back to the first condition (FIG. 3), the method changes the electrical command signal (113) from the second to the first over a second time (T2), wherein T2 is greater than T1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.