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Electromobility is not just about electric motors – why not electrify a whole highway? That’s what we did in Sweden. The eHighway supplies trucks with power via an overhead contact line with twice the efficiency of combustion engines.
Trucks equipped with electric pantographs are traveling a public road for the first time. Siemens has installed an overhead line for electric and hybrid trucks in Sweden. Two diesel hybrids from automotive maker Scania are being powered by electricity here, thus running exhaust-gas free. Siemens installed the two-kilometer eHighway north of Stockholm. The technology is expected to prove itself in practice there by 2018.
Experts expect freight transportation to triple by 2050. So in spite of an expansion of the rail network, considerably more trucks will be taking to the road. As a result, traffic in Sweden, for example, causes more than one-third of the country’s CO2 emissions. Almost half of that comes from freight traffic, which is why the country has decided that by 2030, its transportation sector will be independent from fossil fuels. But because of the increase in freight traffic, expanding rail capacity isn’t going to be enough. Instead, some solution has to be found to decarbonize road freight traffic. Electrified highways might be an optimum addition to the picture here. In a two-year trial run, Sweden wants to find out whether the Siemens eHighway system will measure up for permanent future use.
Twice as Efficient as Carriage via Diesel Truck
eHighway is an energy-efficient, low-emission solution that Siemens developed for heavily traveled short-haul truck routes. It includes overhead electric lines for the highway, and electric or hybrid trucks with intelligent pantographs to pick up current. A sensor system enables the pantograph to automatically make and break contact with the overhead line at speeds as high as 90 kph. As long as there’s an overhead line, the trucks generate no local emissions at all. On conventional roads, depending on what type of drive they use, they switch over to diesel, gas or battery mode. An eHighway, with about 80 percent efficiency, is about twice as efficient as transport via a diesel truck. That’s because electric drives are more efficient. On top of that, transmitting electricity via overhead lines is very environmentally friendly – efficiency here is 99 percent. The eHighway’s energy efficiency increases even further if the trucks recycle electric braking energy back to the supply network.
Julia Hesse / Norbert Aschenbrenner Picture credits: from top: 1.picture Scania CV AB
Siemens has been working on the technology for eHighways since 2011 – highways on which electric-drive vehicles can draw electricity from an overhead line via a pantograph on the roof. As part of the ENUBA 1 research project for electromobility of heavy-duty utility vehicles to relieve environmental impact in metropolitan regions, Siemens has developed a complete concept for electric catenary-wire based operation of heavy utility vehicles, and tested its technical feasibility on a specially constructed test track north of Berlin. For the ENUBA 2 project, Siemens worked with Scania to develop a concept for electric, catenary-wire based operation of heavy utility vehicles and tested its technical feasibility. For this second research project, a bigger test track was initiated in Groß Dölln, mimicking conditions in real-life operation. In pilot projects in California and Sweden, Siemens is now demonstrating the eHighway system in public for the first time.
