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:
Jan. 03, 1989
Filed:
Mar. 24, 1987
Hiroshi Tanaka, Tokyo, JP;
Yoshihiko Morimoto, Mitaka, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A control system for a continuously variable transmission has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The tansmission ratio control valve has chambers at both ends of the spool. By controlling flow rate of oil supplied to the chambers with a control signal in accordance with a desired transmission ratio, the spool is shifted, so that the transmission ratio is controlled to a desired transmission ratio. When the actual transmission ratio does not coincide with the desired ratio in a steady state of an engine, the control signal is corrected so as to reduce the difference between the desired transmission ratio and the actual ratio.