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:
Feb. 01, 2005
Filed:
Aug. 28, 2003
Masahiro Yamamoto, Fuji, JP;
Midori Yamaguchi, Fuji, JP;
Masahiro Yamamoto, Fuji, JP;
Midori Yamaguchi, Fuji, JP;
JATCO Ltd, Fuji, JP;
Abstract
A belt type continuously variable transmission (CVT) () for a vehicle varies the speed ratio in accordance with the hydraulic pressure that is regulated via a hydraulic pressure regulating unit (). A sensor () detects a vehicle speed. A CVT controller () calculates a target hydraulic pressure that is supplied to the CVT () on the basis of a predetermined speed change schedule so that the speed ratio varies in the direction of up-shifting as the vehicle speed increases (S). The CVT controller () also determines whether or not a specified condition holds (S, S), and controls the hydraulic pressure regulating unit according to a target start-up hydraulic pressure which is larger than a target hydraulic pressure for normal running (S, S), thereby preventing a speed change lag when the vehicle starts to move.