Hydraulic control system for vehicular automatic transmission with two accumulator control values to vary back pressure to accumulator to follow the change in engine torque
US4854195A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 29, 1985 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Jul 29, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H59/50
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Described herein is a hydraulic control system for vehicular automatic transmission, including an accumulator back pressure control circuit which is provided between a line pressure conduit and a back pressure supply conduit, and comprises a first accumulator control valve for dropping the line pressure according to the throttle opening, and a second accumulator control valve receiving an input pressure commensurate with the throttle opening and dropping the output pressure of the first accumulator control valve according to the throttle opening to apply to the piston of the accumulator a back pressure varying in corresponding to the engine output shaft torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.