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:
Jul. 09, 2002
Filed:
Dec. 15, 2000
Shinji Matsumoto, Yokohama, JP;
Takeshi Kimura, Yokosuka, JP;
Taku Takahama, Yokosuka, JP;
Hiromitsu Toyota, Yokosuka, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A road surface friction coefficient estimating apparatus is provided for estimating a road surface friction coefficient of a vehicle that is traveling at a steady state. The road surface friction coefficient estimating apparatus basically has a driving/braking force controller, a driving force controller, a braking force controller (brake fluid pressure controller), a plurality of wheel velocity sensors, a wheel load sensor and a control unit. The driving/braking force controller sets a pre-selected force to be generated and calculates the road surface friction coefficient. The driving force controller generates a driving force in accordance with the pre-selected force. The braking force controller generates a braking force in accordance with the pre-selected force. The wheel velocity sensors produce a wheel velocity signal indicative of a wheel velocity. The wheel load detecting sensor produces a wheel load signal indicative of a wheel load. The control unit which is part of driving/braking force controller calculates a road surface friction coefficient based on the wheel load, the wheel velocity, and the braking and driving forces. The braking force is configured to cancel the driving force.