Patent Number: 8,813,927

Title: Hydraulic pressure control system for torque converter

Abstract: A hydraulic pressure control system for a torque converter includes a lock-up clutch operated according to pressure difference between an engagement and disengagement side oil chambers, a first hydraulic line communicated with the disengagement side oil chamber, second and third hydraulic lines communicated with the engagement side oil chamber, and a lock-up switch valve and a torque converter hydraulic pressure control valve that generate pressure difference between the second and the third hydraulic line communicated so that fluid within the engagement side oil chamber is circulated in lock-up on state of the lock-up clutch, and the lock-up switch valve and the torque converter hydraulic pressure control valve generate pressure difference between the second and the third hydraulic line in slip state of the lock-up clutch higher than the pressure difference between the second and the third hydraulic line in the lock-up on state of the lock-up clutch.

Inventors: Son; Hyunjun (Hwaseong-si, KR)

Assignee: Hyundai Motor Company

International Classification: F16H 61/14 (20060101); F16H 45/02 (20060101)

Expiration Date: 8/26/12018