As part of various activities related to electric drives, ZF Friedrichshafen AG works on chassis integrated electric drives as well. The objective is to determine the potential of wheel-individual drives and to find a advantageous concept with a view to the current state of technology. The essential result of this study is called Electric Twist Beam (eTB) - the compact solution for electric driving. With the eTB, a chassis integrated drive system for small vehicles has been developed and tested. During this development, it was essential to consider both aspects regarding driveline and chassis, to find a concept which fulfills all necessary functions. The fundamental advantages of the resulting system can be summarized by the following points: (1) Low system weight: Achieved by functional integration and the high-speed drive concept, the system weight can be significant reduced. (2) Reduced installation space: Because the drive units are fully integrated in the chassis, additional space at the body-side is available and the vehicle architecture can be designed with fewer restraints. (3) Low unsprung mass: Compared to known in-wheel motor concepts, the unsprung mass is significantly reduced by the advantageous positioning of the motor and the high-speed drive concept. (4) Wheel-individual drive torques: Because drive torques of each traction wheel can be controlled individually (so-called 'torque vectoring'), agility and driving safety are clearly improved. In addition, electric motors provide a faster response characteristic and a better steady-state control accuracy compared to friction brakes, which gives potential to improve wheel slip control. (5) Simple vehicle integration: As conventional body designs were considered during the development and body-mounting points were kept at typical positions, the Electric Twist Beam can easily be integrated into conventional vehicles of the target segment.
Electric twist beam (eTB) - The compact solution for electric driving
2013
5 Seiten, 4 Bilder
Aufsatz (Konferenz)
Englisch
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