Method for controlling a multi-speed transmission having four planetary gear sets for producing at least nine gear speeds
US8961355B2 · kind B2 · utility
87Cited by
10References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 21, 2011 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Sep 11, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2046
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission of the present invention has an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices include clutches and brakes. A method for controlling the transmission selectively engages the torque transmitting devices in combinations of at least two to establish at least nine forward speed ratios and at least one reverse speed ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.