Automatic transmission control system
US5785628A · kind A · utility
9Cited by
6References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Jan 30, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0488
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for an automatic transmission having friction coupling elements, at least one of which is locked in 3rd and 4th gears and unlocked in 1st and 2nd gears, includes a first shift valve shiftable between 3rd and 4th gears, and second shift valve shiftable between in 2nd gear and 1st gear in which engine brake available, and a solenoid valve providing control pressure which is selectively directed to these shift valves and cause them to shift so as to lock or unlock the friction coupling elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.