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. 24, 1991
Filed:
Sep. 26, 1990
Yoshinori Yamashita, Shizuoka, JP;
Sadayuki Hirano, Shizuoka, JP;
Takumi Tatsumi, Hyogo, JP;
Hiroaki Yamamoto, Hyogo, JP;
Suzuki Jidosha Kogyo Kabushiki Kaisha, Shizuoka, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method for controlling a continuously variable transmission having a pair of pulleys each of which includes a groove defined between a stationary pulley element and a movable pulley element, including the step of using hydraulic oil for increasing and decreasing the width of the groove to respectively decrease and increase the radius of rotation of a belt looped around the pulleys to thereby vary the belt ratio. A hydraulic clutch is provided, and connection and disconnection of the clutch is controlled according to various predetermined control modes. Line pressure is controlled with a control device which uses both open loop control, and closed loop feedback control responsive to a signal from a pressure sensor. During open loop control, the line pressure is controlled so as to reflect the clutch pressure during a vehicle start mode.