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. 05, 2016
Filed:
Apr. 26, 2010
Naofumi Nishida, Toyota, JP;
Naofumi Nishida, Toyota, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
Disclosed is a hydraulic control device for a continuously variable transmission which changes the transmission gear ratio by changing the hydraulic pressure supplied to hydraulic pressure chambers for pulleys in the continuously variable transmission via control valves is changed. In this hydraulic control device, line pressure regulation hydraulic pressure which corresponds to the magnitudes of the oil pressure supplied to the hydraulic pressure chambers is introduced into a regulator valve, and line pressure which is input into the control valves according to the magnitudes of the oil pressure is subjected to feedback regulation. In the hydraulic control device for the continuously variable transmission, after the valve element of the control valve is driven in the valve opening direction, a vibration restriction control operation which temporarily restricts the displacement of the valve element is executed.