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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.:

US 7487028 B1

PDFFull Text
Date of Patent:
Feb. 03, 2009

Filed:

May. 13, 2004

Device and method for evaluating low-μ road and power distribution control device for four-wheel drive vehicles

Applicants:

Ryouhei Shigeta, Kariya, JP;

Tsuyoshi Murakami, Kariya, JP;

Inventors:

Ryouhei Shigeta, Kariya, JP;

Tsuyoshi Murakami, Kariya, JP;

Assignee:

JTEKT Corporation, Osaka, JP;

Attorney:

Darby & Darby P.C.

Primary Examiner:

Thomas G Black

Assistant Examiner:

Christine M Behncke

Int. Cl.
CPC ...
B60T 7/12 (2006.01); G06F 17/00 (2006.01); G06F 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract

A power distribution control devicecalculates a low-μ information magnitude, associated with the friction coefficient of the road surface, based on the slip rate and the vehicle acceleration operation magnitude. If the low-μ information magnitude exceeds an addition evaluation threshold, the power distribution control deviceadds the low-μ information magnitude. If the low-μ information magnitude does not exceed the addition evaluation threshold, the power distribution control devicesubtracts a constant K from a counter. The power distribution control devicemakes evaluates a road to have a low-μ when the counter exceeds a low-μ evaluation threshold.

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