Swiss Universities of Applied Sciences and Empa design a first of its kind
World's largest electric truck in operation
The eDumper dump truck is the largest electric vehicle in the world and will be in operation in a quarry in Péry in the Bernese Jura from 20 April. Together with industry partners, the Bern University of Applied Sciences BFH, the NTB Interstaatliche Hochschule für Technik Buchs and Empa have developed this eco-friendly truck.
Brakes are for winners!
The eDumper will transport lime and marl rocks from a higher mining area to a lower processing plant. During the fully loaded descent, the batteries are charged by recuperation of braking energy. According to preliminary calculations, the electricity generated in this way is largely sufficient for the empty return journey uphill to the mining area. Thus, the vehicle would be a zero-energy vehicle. The exact energy balance of the eDumper will be shown by investigations in everyday operation over the next few months.
From diesel engine to electric drive
The eco-friendly eDumper was completely rebuilt on the basis of a diesel-powered Komatsu HD 605-7 dump truck. In order to optimally size the electric drive, researchers at the Bern University of Applied Sciences at the Institute for Energy and Mobility Research IEM equipped the conventional model with a variety of sensors so that numerous measurement data could be obtained. Among other things, the necessary torque at the cardan shaft and the power output of the engine are measured together with the respective driving condition and the GPS data of the vehicle.
The BFH Energy Storage Research Centre then dealt with the evaluation of suitable battery cells and the cooling of a battery module. The suitable Li-ion cells were selected and one of the battery modules assembled with the selected battery cells was tested in a special test facility housed in a ship container.
In order to guarantee the longevity and robustness of the technology, the Interstate University of Applied Sciences Buchs investigated the vibrations of the diesel dump truck in real use and the heat emission of the battery cells of the future eDumper. This research team also designed the thermal management for the battery pack, calculated the necessary strength of the battery holders and the design of the welding seams. It is also responsible for monitoring the eDumper battery in real use.
To ensure the fire safety of such a large battery cell, the Swiss Federal Laboratories for Materials Science and Technology Empa examined the behavior of the Li-Ion cells used in the event of a short circuit or mechanical damage. Never before has a land vehicle been equipped with such a huge battery pack. The eDumper is now designed in such a way that a failing cell cannot affect neighbouring cells.
Industrial partners from Switzerland
Not only the design of the eDumper was done in Switzerland, also the components were partly from Swiss SME: the actual conversion took place at Kuhn Schweiz AG in Lommis (TG) and Heimberg (BE). The synchronous drive motor (Oswald Motoren GmbH), gearbox (Puls Getriebe GmbH), batteries (Lithium Storage GmbH) and inverters (Aradex AG) are all custom-made products based on the latest generation of industrial products. They were installed in the empty chassis of the KOMATSU HD 605-7 in September/October 2017. The hydraulic pumps for the multi-disc brake system, tilting drive, servo support and preload of the secondary brake system are driven by another 200 kW electric motor from the Berner Oberland (Brienzer Motoren AG). The 600kWh power storage, consisting of four blocks, is located in the engine compartment and instead of the diesel tank. The project is supported by the Swiss Federal Office of Energy (SFOE).
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