Control system for vehicle transmissions
US4871048A · kind A · utility
8Cited by
11References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1987 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Sep 21, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission control system for actuating a hydraulically controlled vehicle transmission that includes a pair of shiftable valve members determining four range speed conditions and two shiftable valve members determining whether the vehicle is in forward or reverse. Operating in conjunction with the speed range valve members is a fill control system which provides for rapid filling of the clutches and a pressure control system which provides for the controlled rate of energization of the clutches once the clutches have been filled to eliminate shift shock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.