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. 07, 1987
Filed:
Oct. 03, 1985
Applicant:
Inventors:
Yuji Kobari, Yokosuka, JP;
Keiichi Miyamoto, Yokohama, JP;
Assignee:
Nissan Motor Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B62D / ; B60F / ;
U.S. Cl.
CPC ...
180247 ; 180167 ; 180 791 ;
Abstract
A four wheel drive motor vehicle is equipped with a change-over unit for selecting a four wheel drive mode or a two wheel drive mode, a road surface condition sensing sonar system, and an actuator for actuating the change-over unit to change the drive system to the four wheel drive mode when the road surface condition sensing system determines that the road surface is slippery. The road surface condition sensing means has ultrasonic transmitter and receiver, and a control unit such as a microcomputer for determining whether the intensity of waves reflected from the road surface is equal to or lower than a predetermined value.