Road surface friction and hill slope estimator
US5132906A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1990 |
| Grant date | Jul 21, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/702
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A system and method for estimating hill slope and coefficient of friction for a road surface from vehicle and engine measurements. A first variable related to hill slope and a second variable related to road surface coefficient of friction are generated from the vehicle and engine measurements and may be used in a variety of control applications. The method includes the steps of generating a first variable related to the slope of the hill and a second variable related to the coefficient of friction of the road surface. The hill slope can be determined from the first variable and the coefficient of friction of the road surface can be determined from the second variable. These estimated values can then be used in control applications. The braking and traction control systems of a vehicle respond to a first variable related to hill slope and a second variable related to road surface of coefficient of friction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.