Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1995-04-07
1997-08-12
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
477 37, 477 48, B60K 4116
Patent
active
056559917
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.
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Lardy Patric
Petersmann Joseph
Seidel Willi
Bonck Rodney H.
Dr. Ing. h.c.F. Porsche AG
Kwon Peter T.
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