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:
Jun. 12, 2007
Filed:
Sep. 26, 2003
Shigeki Shimanaka, Kanagawa, JP;
Hiroyasu Tanaka, Kanagawa, JP;
Youhei Ishikawa, Kanagawa, JP;
Tatsuo Wakahara, Kawasaki, JP;
Yoshihisa Kodama, Yokohama, JP;
Hideki Oshita, Yokohama, JP;
Shigeki Shimanaka, Kanagawa, JP;
Hiroyasu Tanaka, Kanagawa, JP;
Youhei Ishikawa, Kanagawa, JP;
Tatsuo Wakahara, Kawasaki, JP;
Yoshihisa Kodama, Yokohama, JP;
Hideki Oshita, Yokohama, JP;
JATCO Ltd, Fuji-shi, JP;
Abstract
During a downshift of a belt-drive continuously variable transmission, occurring owing to vehicle deceleration, a CVT controller foretells that a slippage between a drive belt and each of primary and secondary variable-width pulleys tends to occur, when a primary pulley pressure is less than a first predetermined pressure level and a primary pulley speed is less than a first predetermined rotational speed. When the belt slippage has been foretold, the CVT controller inhibits the primary pulley pressure from dropping by setting an actual transmission ratio calculated before a set time period from a time when the slippage has been foretold or a transmission ratio of a relatively higher speed side as compared with a ratio-change operating state obtained when the slippage has been foretold, to a desired transmission ratio, or by relatively rising a line pressure as compared with a line pressure level produced when the slippage has been foretold.