The role of the transmission within automated powertrains is becoming increasingly important, with the modern automatic transmission being the most important element in the vehicle's drivability. Competition between the various powertrain and transmission concepts is at all-time high. In addition, the electrification of the powertrain offers new alternatives. Against this background the transmission system plays a major role in CO2 emission reduction.Within the scope of work of the 'HICEPS' project funded by the European Union, FEV has developed a new hybrid transmission for transverse installation. The new transmission concept is based on three simple planetary gear sets with not more than three clutches and two brakes.This transmission is based on the technology of planetary automatic transmissions and realizes seven forward speeds with only three planetary gear sets, three clutches and two brakes. Because of its innovative layout without hydrodynamic torque converter and with on-demand actuation, it achieves significant better efficiency than conventional automatic transmissions. The transmission design is modular for a hydraulic and a pure electric actuated engagement system. Besides an electro-hydraulic actuation mechanism, also an electro-mechanic one is under development. The advantages and disadvantages are shown in the paper. The electromechanical actuation is discussed in detail and the first component tests are discussed.
New planetary based hybrid automatic transmission with electric torque converter and on-demand actuation
Neuer Hybrid-Planetenautomat mit elektrischem Drehmomentwandler und bedarfsgerechter Aktuierung
2010
15 Seiten, 15 Bilder, 1 Tabelle, 3 Quellen
Conference paper
Storage medium
English
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