Hydraulic control system for automatic transmissions
US5919113A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Oct 29, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a hydraulic control system for automatic transmissions including a plurality of friction elements, comprising a hydraulic pressure source; hydraulic pressure regulating parts for controlling hydraulic pressure from the hydraulic pressure source; damper clutch control parts for actuating a damper clutch of the torque converter by supplying hydraulic pressure fed from the pressure regulating parts to the torque converter; shift control parts for selecting a shift mode by converting hydraulic pressure from the pressure regulating parts into drive pressure; hydraulic pressure control parts for controlling the drive pressure from the shift control parts; and hydraulic pressure distributing parts for suitably distributing hydraulic pressure from the hydraulic pressure control parts to each friction element, said hydraulic pressure distributing parts comprising a 1-2 shift valve; a 2-3/4-3 shift valve; and shift timing control parts having a shift timing control valve for supplying hydraulic pressure to an end clutch and to a kickdown servo, and a solenoid valve for controlling hydraulic pressure supply timing from the shift timing control valve to said end clutch and kickdow…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.