Method and apparatus for hydraulic control of automatic transmission
US4324156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1979 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Mar 21, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0488
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission includes a plurality of friction units to effect shifting between gear ratios, one of which includes driving and driven elements which may operate with a speed differential at the time of shifting between gear ratios. A first or line pressure is generated which is variable in a first pattern corresponding approximately to the pattern of torque output of the vehicle engine. This pressure is supplied to a friction unit other than the one friction unit to operate such other friction unit. A second pressure is generated which is variable in a second pattern corresponding approximately to a combination of the pattern of the engine torque output and the pattern of differential speed between the driving and driven elements of said one friction unit at the time of engagement of the elements. The second pressure is directed to said one friction unit to operate such one friction unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.