Title: Efficient CVT hybrid driveline with improved drivability

Authors: Bernd-Robert Hohn, Hermann Pflaum, Claus Lechner, Thomas Draxl

Addresses: Forschungsstelle fur Zahnrader und Getriebebau (Gear Research Centre) – FZG, Technische Universitat Munchen, Boltzmannstrasse 15, 85748 Garching, Germany. ' Forschungsstelle fur Zahnrader und Getriebebau (Gear Research Centre) – FZG, Technische Universitat Munchen, Boltzmannstrasse 15, 85748 Garching, Germany. ' Forschungsstelle fur Zahnrader und Getriebebau (Gear Research Centre) – FZG, Technische Universitat Munchen, Boltzmannstrasse 15, 85748 Garching, Germany. ' Forschungsstelle fur Zahnrader und Getriebebau (Gear Research Centre) – FZG, Technische Universitat Munchen, Boltzmannstrasse 15, 85748 Garching, Germany

Abstract: Hybrid propulsion is a viable solution to improve the fuel economy of road vehicles. The Optimised CVT Hybrid is a parallel hybrid driveline based on a two-range Continuously Variable Transmission (CVT). Fuel savings of up to 30% compared with a conventional diesel-powered vehicle have been demonstrated, but the driveline also provides good drivability and high ride comfort. The starting process of the IC engine and shifting between the two speed ranges are performed without interruption of traction. The paper describes the driveline concept and presents experimental results on the powershift, the engine start, fuel consumption and energy balance.

Keywords: hybrid propulsion; drivability; parallel hybrid; diesel hybrid; hybrid driveline; CVT; continuously variable transmission; multi-disc clutch; synchronised clutch; engine start; powershift; fuel economy; energy balance; double-layer capacitors; vehicle design; fuel consumption; ride comfort.

DOI: 10.1504/IJVD.2010.032984

International Journal of Vehicle Design, 2010 Vol.53 No.1/2, pp.70 - 88

Available online: 06 May 2010 *

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