Methods and systems for drive-to-neutral and neutral-to-drive transmission garage shift quality improvement
US7789797B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2007 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Feb 9, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2312/09
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present disclosure improves both the D-N and N-D garage shift by reducing torque applied to the powertrain mount system and vehicle suspension systems during garage shifts. Since less energy in stored in the mount system and suspension system, the reaction bump during garage shifts will be reduced without compromising vehicle performance. For the N-D garage shift, such as after key-on when a shift lever is positioned in drive, a vehicle shifts to second gear (or some other higher gear) which provides reduced torque applied to the powertrain mount system and vehicle suspension system. For the D-N garage shift, as a vehicle slows down to a zero speed with the brake on, the vehicle is shifted into a higher gear. As the vehicle starts to launch, the vehicle is immediately shifted back to first gear, launching the vehicle with its first gear ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.