Shift control device and shift control method of automatic transmission
US7563198B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2006 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Jan 19, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/462
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shift control device of a vehicular automatic transmission that establishes a plurality of gear steps of different speed change ratios by selectively engaging a plurality of friction engagement devices ends the shift control by making an engagement end determination regarding an engagement-side friction engagement device if it has been determined continuously for a predetermined time that the input shaft rotation speed of the automatic transmission is in the vicinity of the synchronous rotation speed of the post-shift gear step. The predetermined time is set at a first time if the downshift is a power-on downshift due to a shift judgement in a power-on state, and is set at a second time that is shorter than the first time if the downshift is a power-off→on downshift selected in connection with a change to the power-on state during a power-off shift due to the shift judgment in a power-off state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.