Hydraulic control system for automatic transmission
US5984835A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1996 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Nov 18, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/067
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An automatic transmission control system having a hydraulic control circuit for supplying operating pressure selectively to a plurality of friction coupling elements to place the transmission in desired gears includes a pressure generator for generating operating pressure and supplying it to specific coupling elements which operate in response to operating pressure at different highest levels and an accumulator having a spring loaded piston which provides an increase in operating pressure at a rate variable according to movement of the piston, the rate being greater for greater piston movement as compared with for smaller piston movement, the accumulator being brought into communication selectively with the specific coupling elements by means of a switching element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.