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. 04, 1991
Filed:
Nov. 18, 1988
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 transmission ratio control valve has chamber at both ends of the spool. By controlling the flow rate of oil supplied to the chambers in accordance with a desired transmission ratio, the spool is shifted, so that the rate of change of the transmission ratio is controlled. The transmission ratio changing rate is corrected by the rate of change of the desired transmission ratio. Two coefficients representative of the degree of throttle opening and a physical condition such as viscosity are also generated to correct the transmission ratio changing rate.