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. 02, 2002
Filed:
May. 24, 2000
Jae-Shin Yi, Suwon, KR;
Hyundai Motor Company, Seoul, KR;
Abstract
A hydraulic control system for a continuously variable transmission includes a pressure regulator, a shift controller, a forward/reverse controller, and a torque converter operation controller. The pressure regulator includes a primary regulator valve for regulating hydraulic pressure supplied from an oil pump, a first solenoid valve, a secondary regulator valve, and a solenoid supply valve. The shift controller includes a shift ratio control valve, and a second solenoid valve controlling the shift ratio control valve. The forward/reverse controller includes a pressure control valve, a third solenoid valve controlling the pressure control valve, a manual valve, and first and second friction elements acting respectively as forward and reverse operational elements. The torque converter operation controller includes a torque converter feed valve receiving hydraulic pressure from the pressure regulator, a lock-up clutch control valve, and a fourth solenoid valve controlling the lock-up clutch control valve. A single accumulator is mounted between the pressure control valve and the manual valve of the forward/reverse controller.