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:
Apr. 18, 1989
Filed:
Sep. 21, 1987
Haruyoshi Kumura, Kamakura, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A control system for a continuously variable transmission for an automotive vehicle, including a hydraulically operable driver pulley and follower pulley, a V-belt tensioned between the driver and follower pulleys, and means, including a shift actuator and a shift control valve, for hydraulically controlling a reduction ratio between the driver and follower pulleys by controlling a ratio of hydraulic fluid pressure applied to the driver pulley to hydraulic fluid pressure applied to the follower pulley. According to this control system, the continuously variable transmission is prohibited against effecting downshifting after predetermined conditions have been satisfied after application of the vehicle brake as detected by a brake sensor.