Hybrid buses improve air quality in Hanoi

Jul 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: Intel wireless charging in a bowl coming sooner than later

add to favorites email to friend print save as pdf

Related Stories

Hybrid Bus in the City: A Prototype with a Future

Aug 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.

Electric hybrid drives for aircraft

Jul 09, 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 ...

New bus system tops off batteries in just 15 seconds

Jun 04, 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), ...

'Flybus' prototype may be hybrid bus of future

Sep 08, 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 ...

Recommended for you

Team improves solar-cell efficiency

Sep 19, 2014

New light has been shed on solar power generation using devices made with polymers, thanks to a collaboration between scientists in the University of Chicago's chemistry department, the Institute for Molecular ...

Calif. teachers fund to boost clean energy bets

Sep 19, 2014

The California State Teachers' Retirement System says it plans to increase its investments in clean energy and technology to $3.7 billion, from $1.4 billion, over the next five years.

Idealistic Norwegian sun trappers

Sep 19, 2014

The typical Norwegian owner of a solar heating system is a resourceful man in his mid-fifties. He is technically skilled, interested in energy systems, and wants to save money and protect the environment.

User comments : 0