Control means for vehicle automatic transmissions
US4662247A · kind A · utility
13Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 1984 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | May 31, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0444
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vehicle automatic transmission including a torque converter and a multiple stage transmission gear mechanism. The gear mechanism is controlled through a hydraulic system having solenoid valves. An electronic control unit is provided to control the hydraulic system under a shift control map having shift up and shift down control lines. The shift down control line is determined in terms of the torque converter turbine speed and the engine throttle valve position as a line passing through points of maximum curvature on iso-engine-output-power lines as functions of the torque converter turbine speed and the engine load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.