Shift control system for automatic transmission
US4970916A · kind A · utility
14Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Mar 29, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2302/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The states of two solenoids which control four forward gears of a transmission, are toggled between ON and OFF states in response to the outcome of a comparative ranging of a ratio with limits derived from pre-recorded data. In the case of a power ON upshift data which is recorded in terms of throttle opening is used. On the other hand, when a power OFF upshift is induced by releasing the vehicle accelerator pedal, data which is recorded in terms of vehicle speed is used to set the limits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.