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:
Mar. 16, 1999
Filed:
Aug. 15, 1997
Jaeduk Jang, Kyungki-do, KR;
Hyundai Motor Company, Seoul, KR;
Abstract
A hydraulic control system for an automatic transmission used in a vehicle, the hydraulic control system includes a pressure regulating part for regulating hydraulic pressure generated from a hydraulic pump to constant line pressure, a manual valve selectively supplying hydraulic pressure to a drive pressure passage, a reverse pressure passage, and a first and a second speed pressure passage. A pressure control part supplies standard pressure to solenoid valves which are duty-controlled by a transmission control unit. The pressure control part has a solenoid supply valve. A damper clutch control part controls a damper clutch of a torque converter. A pressure distributing part distributes an appropriate amount of pressure to friction members, and has shift valves and clutch valves. A torque pressure generating part reduces the line pressure so that it can be used for initial shifting control. A pressure compensating device compensates hydraulic pressure by elastically storing the standard pressure when the hydraulic pressure fed to the torque pressure generating part, the pressure regulating part, and the damper clutch control part is reduced, the pressure compensating device being connected to the pressure control part.