Double transition upshift control for an automatic transmission
US5050458A · kind A · utility
15Cited by
10References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1991 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Feb 7, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0451
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved control method for properly coordinating a double transition upshift. The state changes of the various clutches of the transmission are sequenced in relation to a dynamic measure of the transmission speed ratio so as to provide consistent high quality shifting. Closed-loop pressure controls are employed in conjunction with the sequencing to ensure timely shift completion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.