Larry R Bell

US Patent:

58640568, Jan 26, 1999

Filed:

Feb 17, 1998

Appl. No.:

/025096

Inventors:

Larry D. Bell - Chantilly VA
Christopher D. Bell - Chantilly VA

International Classification:

G01M 1702

US Classification:

73146

Abstract:

A method for providing skid warning, a qualitative assessment of the coefficient of friction in the footprint of each tire, and a tire tread wear out indication to a vehicle operator or other automatic systems, is described. The method uses tread force sensors, which can be installed in a tire with minimal changes to tire materials and manufacturing methods, or after tire manufacture. Tread forces within the footprint of a tire are sensed by means of embedded sensors anchored at one end to the tire structure, and at the other end to the tire tread, such that slipping of small discrete tread elements in contact with the roadway can be detected; thereby enabling the determination of the coefficient of friction before the entire footprint slips. Furthermore, coupling of the sensors between the tire structure and the tread within a small area, enables the system to use tire deformation-induced tread gripping forces to determine the coefficient of friction without the presence of maneuvering loads. Tread wear is also determined by monitoring tread slip behavior and tread forces.