ECO TARGET: An Innovative Power Train to Fulfill Future Mobility Requirements

Authors

Dr.-Ing. S. Rinderknecht, Dipl.-Ing. M. Seufert, GETRAG, Untergruppenbach; Dr.rer.nat. R. Ellinger, Dipl.-Ing. R. Schneider, AVL List GmbH, Graz; Dipl.-Ing. J. Wagner, ATB Thien, Rankweil

Year

2004

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 566

Summary

Within the scope of the Kyoto protocol, limitations on CO2 emissions were agreed for the future. The combination of increasingly stringent emissions legislation and increasing customer demand for comfort and driveabiltiy requires an optimisation of the entire power train. Based on detailed entire system analyses, the mild hybrid system ECO TARGET was developed featuring a 1,2 L diesel engine, a 6 speed automated manual transmission and a 10 kW 42 V e-motor, which is directly mounted onto the transmission. This power train was installed into a mid class vehicle (test weight 1350 kg). The target of the project, jointly undertaken by GETRAG, AVL and THIEN, is the demonstration of expected future CO2 emission limits in the range of 90 - 120 g/km within the New European Drive Cycle (NEDC), whilst fulfilling future emissions legislation and considering customer driveability and comfort demands. The fuel consumption improvement potential of the ECO TARGET system is based on engine load operation shift by downsizing and automated gear selection, and the hybrid system's potential for start-stop operation and regenerative braking. In addition, the system offers the possibility for reducing traction interruption during the shift process, with consequently improved comfort compared to conventional automated manual transmissions. The characteristic of the e-motor leads to very good overall steady state and especially transient performance figures. Therefore the reduced low end torque due to downsizing can be overcompensated. Actual chassis dyno results show 98 g/km CO2 emissions at EU IV emission level. Considering thermal encapsulation of the drive train, which is not integrated in the demonstrator vehicle in the moment, a CO2 emission potential in the order of 91 - 93 g/km is feasible. Consequently the ECO TARGET system represents a modern power train in order to fulfill future mobility requirements.

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