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:
Dec. 16, 2014
Filed:
Apr. 30, 2009
Katsumi Doihara, Fuji, JP;
Yoshihisa Kodama, Fuji, JP;
Yasuaki Yoshikawa, Fuji, JP;
Kenta Nakamura, Fuji, JP;
Tomoyuki Mizuochi, Fuji, JP;
Kiyotaka Sawano, Fuji, JP;
Masahiro Nishi, Fuji, JP;
Hidemasa Kawaguchi, Fuji, JP;
Keisuke Koyama, Fuji, JP;
Katsumi Doihara, Fuji, JP;
Yoshihisa Kodama, Fuji, JP;
Yasuaki Yoshikawa, Fuji, JP;
Kenta Nakamura, Fuji, JP;
Tomoyuki Mizuochi, Fuji, JP;
Kiyotaka Sawano, Fuji, JP;
Masahiro Nishi, Fuji, JP;
Hidemasa Kawaguchi, Fuji, JP;
Keisuke Koyama, Fuji, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Jatco Ltd, Fuji-shi, JP;
Abstract
A control device controls a belt type continuously variable transmission including a belt slip controller and a belt slip control permission determining unit. The device decreases belt friction when an estimated accuracy of a belt slip condition is high and prevents a belt from greatly slipping when an estimated accuracy is low. The device includes primary and secondary pulleys and the belt, and controls a gear ratio based on a running radius of the belt on a pulley by controlling primary and secondary oil pressures. The controller oscillates a secondary oil pressure, estimates the belt slip condition by monitoring a phase difference between oscillation components, and reduces an actual secondary oil pressure to maintain a predetermined belt slip condition. The determining unit permits belt slip control when a torque change speed input to the transmission mechanism is less than a predetermined value.