Through the exhaust regulations EU IV and EU V the environment is less polluted by a factor of 100 compared to the engines of the 90s. But still saving fuel is a main priority also because of rising energy costs. The system drivetrain (engine + transmission) is still to be optimized. This has led for example to transmissions with a wide spreading having up to 7 gears which all have at least one overdrive gear. Another approach is the development of hybrid drivetrains which have a remarkable fuel saving potential especially within urban areas (low power demand; stop-and-go traffic; recuperation of braking energy). At the Gear Research Center (FZG) of the Technical University of Munich concepts for hybrid drivelines are developed. The concepts discussed are based on automated manual transmission design. For the electric power flow the same gears are used in opposite torque flow direction compared to combustion engine power flow to enable good acceleration at low driving speed. In order to reduce fuel consumption the electric motor is also used for energy recuperation during deceleration of the vehicle. This energy may be stored by a battery or by double layer capacitors depending on the requirements (full/mild hybrid concept). In addition the driveline concept enables boosting during gear change of the automated manual transmission to reduce traction loss during gear change. Transmission concepts for front and rear wheel drive cars will be presented. Drivability is shown by simulations of the hybrid system behavior.
Hybrid driveline concepts for front and rear wheel drive cars
Hybridkonzepte für Fahrzeuge mit Vorder- und Hinterradantrieb
2006
7 Seiten, 12 Bilder, 6 Quellen
Conference paper
English
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