Downshift control method/system for vehicular automated mechanical transmission
US5873281A · kind A · utility
6Cited by
14References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1926
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method and system for controlling downshifting of an automated mechanical transmission system which senses unsuccessful attempts to engage a predetermined downshift target gear ratio (GR.sub.T) due to engine speed remaining less than the synchronous engine speed (ES=OS*GR.sub.T) for engaging said target gear ratio and, in response to sensing such conditions, automatically initiates a degraded mode of operation wherein an achievable degraded mode target gear ratio (GR.sub.DMT <ES.sub.MAX .div.OS), synchronizable at achieved maximum engine speed (ES.sub.MAX), is identified and caused to be engaged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.