The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2003
Filed:
Nov. 14, 2001
Masaru Kogure, Tokyo, JP;
Yutaka Hiwatashi, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A road friction coefficient estimating apparatus primarily includes an adaptive control road friction coefficient estimating section and an actual value comparison road friction coefficient estimating section. The adaptive control road friction coefficient estimating section inputs signals indicative of a road surface condition with low friction coefficient from a wiper switch, low outside air temperature judging section and the like and estimates an accurate road friction coefficient even under the low friction coefficient road surface condition. When the vehicle travels at high speeds, the actual value comparison road friction coefficient estimating section renders a road friction coefficient estimating value by a yaw rate comparison method gradually close to a road friction coefficient of an asphalted road surface. When a signal IMAGE HALT indicative of a road surface totally covered with snow is inputted, the actual value comparison road friction coefficient estimating section renders the road friction coefficient estimating value gradually close to a low side road friction coefficient produced by the adaptive control road friction coefficient estimating section. Further, when the vehicle travels at high speeds and the signal IMAGE HALT is inputted, the road friction coefficient estimating value is rendered moderately, gradually close to the low side road friction coefficient.