Hybrid Bus in the City: A Prototype with a Future

Aug 20, 2007
Hybrid Bus in the City: A Prototype with a Future
Nuremberg's public transport system has become more "electrified" thanks to a diesel-electric hybrid bus developed by MAN. The vehicle is equipped with drive-system technology from Siemens. The prototype, which also features a special brake energy recovery system, uses up to 25 percent less fuel than conventional buses. The drive system consists of series-produced components, which means mass production of the bus is a possibility that MAN is planning to turn into reality by 2010.

Nuremberg’s public transport system has become more "electrified" thanks to a diesel-electric hybrid bus developed by MAN. The vehicle is equipped with drive-system technology from Siemens.

The prototype, which also features a special brake energy recovery system, uses up to 25 percent less fuel than conventional buses. The drive system consists of series-produced components, which means mass production of the bus is a possibility that MAN is planning to turn into reality by 2010.

In addition to a combustion engine, hybrid vehicles have an electric motor that initially puts the vehicle in motion. This system has a particularly positive effect on fuel consumption in urban driving situations and during rush hour. The electric motor also serves as a generator: When the vehicle brakes, the kinetic energy is not lost, but is instead converted into electricity and stored. This energy is later used to power the vehicle. Hybrid drives are ideal for city buses, which brake and accelerate frequently (e.g. at bus stops and traffic lights).

Working together with specialists from MAN, Siemens Automation and Drives (A&D) connected a diesel engine to an electric power pack consisting of generators, frequency converters, drive motors, and transmission components. The system is now being tested in the Lion’s City Hybrid prototype bus, which operates in Nuremberg.

Depending on engine rpm, energy management software from A&D regulates the energy flow from the electric or diesel drive, and then transfers this energy to the bus drive shaft via the transmission. Special high-performance capacitors store the energy and then supply enough of it to put the vehicle in motion. The prototype has been operating successfully, and MAN is confident that it can begin mass producing the hybrid bus in Europe by 2010 at the latest.

In the meantime, the third test hybrid bus from A&D and MAN has now hit the road in Nuremberg. The Nuremberg buses aren’t the only ones with technology from Siemens, however, as there are currently 1,000 hybrid buses on the road equipped with A&D systems that are being tested in some 30 different projects.

Source: Siemens

Explore further: Power-generating urinal pioneered in Britain

add to favorites email to friend print save as pdf

Related Stories

Korean tech start-ups offer life beyond Samsung

Feb 23, 2015

As an engineering major at Seoul's Yonsei University, Yoon Ja-Young was perfectly poised to follow the secure, lucrative and socially prized career path long-favoured by South Korea's elite graduates.

Fresh nuclear leak detected at Fukushima plant

Feb 22, 2015

Sensors at the Fukushima nuclear plant have detected a fresh leak of highly radioactive water to the sea, the plant's operator announced Sunday, highlighting difficulties in decommissioning the crippled plant.

Spacewalking astronauts route cable in 1st of 3 jobs

Feb 22, 2015

(AP)—Spacewalking astronauts routed more than 300 feet (90 meters) of cable outside the International Space Station on Saturday, tricky and tiring advance work for the arrival of new American-made crew ...

Recommended for you

Researchers explore longer life cycle for batteries

37 minutes ago

Lithium-ion batteries are common in consumer electronics. They are one of the most popular types of rechargeable batteries for portable electronics, with a high energy density, no memory effect and only a ...

Power-generating urinal pioneered in Britain

22 hours ago

British scientists on Thursday unveiled a toilet that unlocks energy stored within urine to generate electricity, which they hope could be used to light remote places such as refugee camps.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.