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. 25, 2003
Filed:
Dec. 29, 2000
Tae-Kyun Kim, Yongin, KR;
Jae-Duk Jang, Yongin, KR;
Jong-Sool Park, Yongin, KR;
Hyun-Soo Shim, Yongin, KR;
Jin-Hee Lee, Yongin, KR;
Chang-Wook Lee, Yongin, KR;
Hyundai Motor Company, Seoul, KR;
Abstract
A hydraulic control system for an automotive automatic transmissions includes a pressure regulator for regulating hydraulic pressure, a pressure reducer having a reducing valve for reducing hydraulic pressure, a shift controller having a manual valve cooperating with a shift selector lever and connected to a plurality of range pressure lines, a pressure controller comprising first, second and third solenoid valves for controlling control pressure reduced by the reducing valve, and first, second and third pressure control valves for controlling hydraulic pressure supplied from the manual valve, the first, second and third pressure control valves being independently controlled by control pressure supplied from the first, second and third solenoid valves, respectively, a switching controller comprising a first switch valve for supplying hydraulic pressure from the first pressure control valve to one of first and second switching lines and a second switch valve for supplying hydraulic pressure from the third pressure control valve and the manual valve to first and second friction elements, a fail-safer comprising a first fail-safe valve for supplying hydraulic pressure from the first switch valve and the manual valve to a friction element operated in low L and reverse R ranges, and a second fail-safe valve for supplying hydraulic pressure from the second pressure control valve to a friction element operated in second and fourth speeds, and an N-R controller comprising an N-R control valve for supplying reverse pressure to a friction element operated in only a reverse R range.