Fraunhofer Institute for Transportation and Infrastructure Systems
Fraunhofer Institute for Transportation and Infrastructure Systems

Propulsion technology

The electric energy is generated by a fuel cell cluster or a diesel electric power pack. The modular energy storage concept is based on a lithium-ion battery system, an electric double-layer capacitor module and a flywheel. Furthermore, fast charging at wayside charging stations can be demonstrated. This configuration of the energy storage devices in combination with an intelligent and predictive energy management system permits a full electric operation mode. Thus, an emission-free operation of up to 2 km is possible.

 

Fuel Cells

(2 x 80 kW)

  • Hydrogen oxygen fuel cell system
  • Hybrid cluster configuration to expand the life span

 

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Fast Charging Device

  • Contact system for galvanic high current transfer up to 1000 A
  • Vehicle-sided collector and way-sided charging stations
  • Large electric conductivity, low abrasion and minor tendency to form electric arcs
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Flywheel Mass Storage

(200 kW and 25000 rpm)

  • Combination of generator and electric motor, capable for fast charging
  • Storage of rotational energy, gimbal-mounted
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Electric Double-Layer Capacitors

 

  • 55 electrical double-layer capacitor modules with high power density and high cycle stability
  • Low-loss recuperation of regenerative braking energy
  • Highly dynamic recharge ability

 

Battery System

 

  • 300 lithium-ion battery cells
  • Observer based in-situ diagnostics of state of charge and state of health

 

Diesel-Electric Generator Unit

(180 kW)

  • Vehicle-sided primary source for energy
  • Electrically controllable force coupling by means of magnetorheologic clutch