Low range drive ratio transfer changeover anti-rollback system and method
US8364369B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 2010 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Jun 7, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2552/15
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle anti-rollback system and method can be incorporated into a vehicle that includes a pair of front wheels, a pair of rear wheels, a power unit, and a transmission connecting the power unit to at least one wheel of the front and rear wheels. The transmission can include a plurality of forward drive ratios and at least one reverse drive ratio and a two speed final drive ratio transmission configured to select between a high range drive ratio and a low range drive ratio when the transmission is in one of the plurality of forward drive ratios. A controller can be provided that senses a vehicle rollback condition. When the rollback condition is detected, the controller can decrease torque distributed from the power unit of the vehicle to the at least one wheel, and can actuate a brake. While the vehicle is braked and torque transfer is reduced, the controller can execute drive ratio changeover in a stable manner from the high range drive ratio to the low range drive ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.