Automatic transmission with electrical override
US4417307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1980 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Jul 17, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/026
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid pressure control device for an automatic transmission of an automotive vehicle, wherein throttle pressure and governor pressure control valves produce a throttle pressure and a governor pressure from a line pressure, while several shift valves produce selectively, according to the balance of the throttle pressure and the governor pressure, pressures for actuating several friction engaging devices which provide several speed stages of the transmission. However, the shift valve which controls switching between the highest and the next to the highest speed stages is electrically controlled in its kick down throttle opening and high speed region, so that in this region the upshift and the downshift lines are both largely biased to the higher vehicle speed, depending upon a throttle opening sensor, a vehicle speed sensor, and an electrical computing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.