Detection of hill grade and feed-forward distribution of 4WD torque bias to improve traction on a low MU surfaces during climbing of such hill grade
US8321110B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2005 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Nov 27, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2720/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A feed forward method for controlling the distribution of torque between the front and rear axle in a four wheel drive vehicle where the slope of a hill upon which the vehicle is traveling is calculated based on measured vehicle longitudinal acceleration and estimated longitudinal acceleration. The hill slope estimation is made and implemented before the wheels of the vehicle begin to slip due to the slope and low friction coefficient of the road surface. Under conditions of high vehicle speeds or severe vehicle turning, the change of torque distribution is not implemented because there is a lesser tendency for the vehicle to slip on the hill surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.