Hybrid Bus in the City: A Prototype with a Future

August 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: New products and solutions to electric commercial vehicles

Related Stories

New products and solutions to electric commercial vehicles

May 11, 2016

There is an increasing need and demand for sustainable and cost-efficient technologies in public transport, logistics and industrial production. Electrification and hybridisation of commercial vehicles and mobile machinery ...

'Flybus' prototype may be hybrid bus of future

September 8, 2011

(PhysOrg.com) -- The "Flybus" prototype bus aims to showcase how hybrid electric buses can be inexpensive, cost efficient and easy on the environment. Reports out this week say that the Flybus is being readied for testing. ...

Revolutionary green technology bus

July 28, 2008

Insight from Oak Ridge National Laboratory, commitment from two Michigan companies and funding from the Department of Energy have led to the commercialization of a lightweight urban transit bus with double the fuel efficiency ...

Hybrid buses improve air quality in Hanoi

July 25, 2013

Siemens and the Vietnam Motors Industry Corporation (Vinamotor) are launching the first hybrid bus with a combined electric/diesel drive in Hanoi. The project is the first of its kind in Vietnam. The vehicle uses the ELFA ...

Texas' first hydrogen fuel cell bus on the road

November 6, 2007

The University of Texas at Austin and Gas Technology Institute (GTI) have introduced a joint technology program that features the first hydrogen fuel cell bus to be licensed and operated in Texas.

Recommended for you

How to build a 1,000mph car (by the scientists behind it)

July 22, 2016

It was a staggering feat, a car that went faster than the speed of sound. On October 15 1997, Andy Green travelled across the Black Rock Desert, Nevada, in the Thrust SSC at 763.035 mph, or Mach 1.02. Two decades on, that ...

0 comments

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.