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:
Mar. 31, 1992
Filed:
Apr. 27, 1990
Hayashi Kageyama, Tokyo, JP;
Shingo Oobayashi, Ohta, JP;
Makoto Shibuya, Ohta, JP;
Kazunari Tezuka, Niiza, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A planetary gear device as a central differential distributes an output torque of a transmission to the front wheels and the rear wheels of a four-wheel drive motor vehicle. A fluid operated clutch is provided between a sun gear and a ring gear of the planetary gear device. A desired speed ratio between front-wheel speed and rear-wheel speed at cornering is calculated based on vehicle speed and steering angle of the vehicle. A torque distribution ratio is determined in accordance with a difference between the desired speed ratio and an actual speed ratio between the front-wheel speed and the rear-wheel speed. The clutch pressure is controlled in response to the torque distribution ratio for engaging the clutch so that the average speed ratio coverages to the desired speed ratio.