Control means for vehicle automatic transmissions
US4753135A · kind A · utility
12Cited by
22References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | May 29, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0096
- 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 in which the torque converter is operated with a torque ratio of substantially one.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.