Speed shift control apparatus of automatic transmission
US6626786B2 · kind B2 · utility
17Cited by
9References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2001 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Nov 29, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0455
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
At the time of the 6→3 speed shift, an automatic transmission achieves a 6→4→3 speed shift by controlling the servo pressures of four engageable elements. A control apparatus controls the servo pressure of one engageable element in accordance with the servo pressures of other engageable elements. The engagement and release timings are adjusted by determining and controlling the oil pressures of the hydraulic servos, taking into consideration the 6→4 shift state (torque sharing) during a shift transitional period. Therefore, engine blow and prolongation are prevented during the 6→3 shift control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.