Control system for an eight-speed automatic transmission
US6767304B1 · kind B1 · utility
19Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 2003 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | May 13, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2023
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An eight-speed automatic transmission having a compound planetary gear set, a second planetary gear set, and a third planetary gear set each driven by three clutches and fixed to four brakes. A hydraulic control system actuates the eight-speed transmission by selectively energizing a plurality of solenoids that in turn engage the three clutches and four brakes. The hydraulic control system provides electronically modulated converter clutch control to the eight-speed automatic transmission system when the hydraulic system is in a drive position, a manual/low position, and a park/neutral position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.