Within the scope of work of the HICEPS project (Highly Integrated Combustion Electric Propulsion System) founded by the European Union, FEV Motorentechnik GmbH, Aachen has developed a new hybrid transmission for transverse installation. This transmission is based on the technology of planetary automatic transmissions and realize seven forward speeds with only three planetary gear sets, three clutches and two brakes. Another innovative feature is the on-demand actuation system. Both an electro-hydraulic and electro-mechanical version have been developed, which both significantly decrease the required actuation energy compared to conventional automatic transmissions. The component test results of the electro-mechanical actuator including durability, controllability and achievable dynamics are very promising. The average power consumption is only 6 W or 20 % of the on-demand electro-hydraulic version. A conventioanl hydraulic actuation system with a mechanically driven oil pump would require an average power of 120 W to 240 W. Additional benefits are achieved with an on-demand cooling and passive lubrication, again a first for planetary-based automatic transmissions. The passive lubrication for all gears has been successfully established on a functional test rig. In the next step, the transmission will be put on a three-dyno-test for efficiency measurements, mechanical durability test and to continue the development of cooling and shifting strategies.
New planetary based hybrid automatic transmission with true on-demand actuation
2011
15 Seiten, 13 Bilder, 2 Quellen
Aufsatz (Konferenz)
Englisch
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