trailer world Issue Two 2012

Issue Two 2012 31 Photos:fünf6,RobertoHegeler,StefanBungert ECO Vison E This is the overall heading for BPW’s presentation of trailer innovations at the IAA Commercial Vehicles in Hanover. The basic concept consists in recuperating energy in phases when no output is produced or required from the motor vehi- cle. However, BPW’s energy recovery system focuses on a smaller energy level because otherwise the generators would have to be too large. After all, braking generates forces of up to 20 kNm. The system is based on two wheel hub generators each with a torque of 100 Nm. The cables run through the axle body to the converter where alternating current voltage is converted into 100V direct current. Heat is dissipated by convection and heat conduc- tion: water cooling is not necessary in systems of this magnitude. The produced direct current is then used to charge a 100V Li-Ion battery. Initially this power is converted into 24V for the vehicle energy system and is supplied to the consumers in the trailer. When fitted in BPW’s ECO Vision ultralight axle, this system would have no impact on weight. going to pay off. Furthermore, the system launch would be combined with BPW’s lightweight axles so that on the bottom line there would be no impact on the trailer weight. Retrofitting to existing trailers would also be possible, given the Compact Design of this system. “Concrete tests in trial vehicles could be carried out before too long”, is the optimistic view expressed by Prof. Krieger. (kr) »We want to show that with justifiable effort, we can save energy in the trailer.« Bernhard Rossenbach, Head of Product Management at BPW For more information about Prof. Krieger’s Institute at Bremen University, go to www.ae.uni-bremen.de Technology

trailer world Issue Two 2012

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