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. 16, 1991
Filed:
Aug. 31, 1989
Applicant:
Inventors:
Assignee:
Nissan Motor Co., Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B60K / ;
U.S. Cl.
CPC ...
36442403 ; 3644241 ; 180233 ;
Abstract
A fail-safe control system includes one or more circuits for detecting failures in sensors and an actuator of a driving force distribution control system of a 4WD vehicle, and a fail-safe means which, if a failure is detected, gradually disengage a transfer clutch until the 2WD state is reached, in such a gradual manner as to prevent spin or drift-out of the vehicle. The fail-safe means may decrease the magnitude of an electric control signal gradually, or may employ a fail-safe valve for gradually decreasing a fluid pressure supplied to the transfer clutch.