Downshift valve in hydraulic transmission control system
US4313354A · kind A · utility
11Cited by
14References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1978 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | Nov 8, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/0267
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a hydraulic control system of an automatic power transmission for an automotive vehicle, a shift gear operable between a higher gear condition and a lower gear condition is designed to provide a satisfactory shift pattern to dictate the schedule for making an upshift from the gear ratios allocated to the shift valve and is arranged with a downshift which provides a satisfactory shift pattern to dictate the schedule for making a downshift between the particular gear ratios so that the respective shift patterns for the upshifting and downshifting schedules between the gear ratios can be selected independently of each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.