|The Opbrid Bůsbaar stations will be located at the ends of the #60 route. Click to enlarge.|
Göteborg Energi, the electricity provider for the City of Gothenburg, awarded a contract to Opbrid SL (Granada, Spain) to provide two Opbrid Bůsbaar ultra-fast bus charging stations (earlier post) for the HyperBus (Hybrid and Plug-in Extended Range) demonstration project in Gothenburg City. This project will consist of three new Volvo plug-in hybrid buses running in traffic and charging for 5-8 minutes at each end of the #60 bus line.
The plug-in hybrid bus is based on the existing Volvo 7900 hybrid bus design, but with the addition of a larger, energy-optimized battery and the ability to connect to the Opbrid Bůsbaar ultra-fast charging station. Use of the Bůsbaar extends the all-electric range of the hybrid bus to a predicted 75% or more of the route.
The Volvo 7900 parallel hybrid is Volvo Buses’ second series-produced hybrid bus model. An electronic control module regulates engagement and disengagement of electric and diesel power, as well as gear-changing modes and recharging of the Li-ion battery. The close-ratio Volvo I-Shift automated transmission has software that is optimized for city and commuter traffic.
The 4-cylinder, 5-liter Volvo D5F diesel engine produces 215 bhp and is installed vertically in the left rear corner. The hybrid offers up to 37% fuel savings compared to a diesel version and 40-50% lower exhaust emissions. On 11 June, Volvo Buses delivered 25 new hybrid buses to Göteborg.
The plug-in hybrid buses will use electricity as their primary power source and diesel for supplementary power. Energy consumption is estimated to be reduced by 60% and CO2 by 75% compared to conventional diesel buses.
|Heavy rail pantographs and the Furrer+Frey conductor rail are designed to handle very high currents. Source: Opbrid. Click to enlarge.|
Use of the Bůsbaar. At the end of the bus route, the driver pulls up underneath the Opbrid Bůsbaar charging station, and the tram-like pantographs on the bus roof quickly rise up to contact the Bůsbaar, which can implemented with either a fixed or a swinging arm. The charging process is completely automatic, with the driver never having to leave the bus. When the batteries are charged, the driver continues on the route.
The Bůsbaar is designed for high current capacity (1,000A max, depending on pantograph design) and high voltage capacity (1,000V max DC). Built by the Swiss electric rail supplier Furrer+Frey, Germany’s Schaefer and Austria’s Schunk SBI, the Bůsbaar is simple and safe and can be installed easily in any location since it is unobtrusive and about the size of a bus shelter.
HyperBus. The HyperBus project is funded partly by the EU Life+ Innovation program, as well as with contributions from Business Region Göteborg, Göteborg Energi, City of Göteborg Traffic & Public Transport Authority, Volvo Buses and the public transport company Västtrafik.
The Hyper Bus project began on 1 September 2011 and will run until 2014. It can be divided into four sub-areas:
demonstration of plug-in technology for hybrid buses;
tests in real city environments on existing bus routes; and
the publication of results and experiences from the project.