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:
May. 06, 2003
Filed:
Nov. 19, 2001
Jong-Sool Park, Kyungki-do, KR;
Chang-Wook Lee, Kyungki-do, KR;
Jae-Ho Cho, Kyungki-do, KR;
Jae-Duk Jang, Kyungki-do, KR;
Tae-Kyun Kim, Kyungki-do, KR;
Jin-Hee Lee, Kyungki-do, KR;
Hyundai Motor Company, Seoul, KR;
Abstract
Disclosed is a hydraulic control system for controlling an automatic transmission comprising a first clutch for transmitting power through a one-way clutch in first, second and third speeds; a fourth clutch for discontinuing an operation of the one-way clutch and which acts as an engine brake; a second brake operating in second and fourth speeds; a second clutch for transmitting power in third and fourth speeds; a first brake for discontinuing the operation of the one-way clutch in the first speed and acting as an engine brake, and operating in low L and reverse R ranges; and a third clutch for operating in the reverse R range, wherein hydraulic pressure controlled by a first solenoid valve is supplied and exhausted through operation of a switch valve to the second clutch and the first brake, the second brake is directly controlled by hydraulic pressure controlled by a second solenoid valve, and the fourth clutch is directly controlled by hydraulic pressure controlled by a third solenoid valve.