Device for controlling a lock-up clutch in an automatic transmission with a lock-up clutch equipped fluid torque converter
US4349088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1979 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Nov 2, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H45/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A device for controlling a lock-up clutch in an automatic transmission having a lock-up clutch equipped fluid torque converter according to this invention comprises a transient release valve which receives pressurized input oil through a hydraulic passage connected to hydraulic servo means incorporated in the transmission, said transient release valve outputting pressured oil when the pressure of the input oil is higher than preset value, and a lock-up shift valve which receives the pressurized oil from the transient release valve, said lock-up shift valve being adapted for engaging the lock-up clutch when the output pressure is higher than a predetermined value and disengaging it when the pressure is lower than the predetermined value whereby the lock-up clutch is controlled by utilizing variations in hydraulic pressure supplied to the hydraulic servo means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.