Hybrid buses improve air quality in Hanoi

July 25, 2013
Hybrid buses improve air quality in Hanoi

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 drive system developed by Siemens, in which the diesel engine does not drive the rear axle via an automatic transmission, as is usually the case. Instead, a generator is activated which supplies one or more propelling motors with electricity via power electronics. The buses consume up to 50 percent less fuel and reduce exhaust emissions by the same amount.

Public transportation is one of the biggest challenges for Vietnamese cities - and many other metropolises in Asia. Their populations are growing rapidly and, at the same time, city are often the only form of mass transit. The buses add significantly to and have high . Over the long term, purely electric drives will help, but the battery technology today is still relatively expensive. Because the vehicles stop frequently at traffic lights and bus stops, hybrid drives that combine diesel engines and electric motors are an excellent choice for city buses.

In the ELFA system developed by Siemens, the electric motors act as generators during braking and feed electricity back into an energy storage unit. The bus can use this energy to run entirely on electric power for stretches at a time and thus with . Depending on the capacity of the energy storage unit, the range is between several hundred meters and several kilometers. The bus operates more efficiently, emits less exhaust and is quieter because the diesel engine does not rev up during acceleration.

Buses with ELFA drive technology have been in operation in various cities around the world for a number of years, including London, Munich and Nuremberg. In Vietnam, Siemens has been working together with the bus manufacturer, Vinamotor, since 2012 to integrate the technology into its buses. The first prototype recently went into service in Hanoi. In a three-month test run, an international team of technical experts from Siemens is currently optimizing the bus for the requirements of Vietnamese environmental and operating conditions. At the end of this phase, series production of the hybrid buses will begin with Vinamotor.

Explore further: Hybrid Bus in the City: A Prototype with a Future

Related Stories

Hybrid Bus in the City: A Prototype with a Future

August 20, 2007

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.

'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. ...

New bus system tops off batteries in just 15 seconds

June 4, 2013

(Phys.org) —A new type of battery bus system being tested in Switzerland is able to operate continually by making use of flash-charging stations. Called Trolleybus Optimisation Systeme Alimentation (TOSA), the new bus and ...

Juiced roads: Volvo explores electric power for trucks, buses

June 18, 2013

(Phys.org) —How are engineers doing in solving the problem of large-sized all electric transport vehicles traveling long distances without the burden of large batteries? One workaround that has been the topic of much discussion ...

Electric hybrid drives for aircraft

July 9, 2013

In cooperation with several partners, Siemens has created its second aircraft powered by an electric series hybrid drive system. The two-seat DA36 E-Star 2 plane recently made its one-hour maiden flight and was then presented ...

Recommended for you

Internet giants race to faster mobile news apps

October 4, 2015

US tech giants are turning to the news in their competition for mobile users, developing new, faster ways to deliver content, but the benefits for struggling media outlets remain unclear.

Radio frequency 'harvesting' tech unveiled in UK

September 30, 2015

An energy harvesting technology that its developers say will be able to turn ambient radio frequency waves into usable electricity to charge low power devices was unveiled in London on Wednesday.

Professors say US has fallen behind on offshore wind power

September 29, 2015

University of Delaware faculty from the College of Earth, Ocean, and Environment (CEOE), the College of Engineering and the Alfred Lerner School of Business and Economics say that the U.S. has fallen behind in offshore wind ...


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.