Process and apparatus for controlling a continuously variable speed transmission
US5655991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Apr 7, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/6616
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention provides a method and apparatus for controlling a continuously variable speed transmission of a motor vehicle driven by an internal-combustion engine, by means of a control arrangement having a selecting device which simulates a stepped transmission by adjusting transmission ratios in according to a group of preset transmission ratios. To prevent repeated up and down shifting, a control arrangement is provided with a unit for detecting driving situations in which a transmission ratio shift according to the preset transmission rations would be too large, and also a unit for adjusting the preset transmission ratio. The recognition unit activates the adjustment unit as soon as the above-described driving situation occurs, and the adjustment unit then changes a preset transmission ratio so that the motive force is adapted to the present motive resistance, allowing the vehicle to achieve a positive longitudinal acceleration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.