Siemens Global Website

ELFA – The economic and  intelligent way to  zero emission

ELFA is a modular drive system featuring extremely high flexibility. This means that the vehicle manufacturer can configure the hybrid drive according to its individual requirements. Fuel consumption and emissions can be substantially reduced through optimum combination and smart energy management.

Benefits at a glance

  • Significantly reduced energy consumption and emissions

  • Zero-emission operation in inner city areas possible

  • Noticeable reduction in noise

  • Greater comfort thanks to gentle, smooth start-up

  • Extremely reliable and low-maintenance traction systems

  • A single source for all components: the motor, generator, inverter, and controller

  • Modular hybrid system for maximum flexibility and cost-effectiveness

  • Proven technology

  • Futuristic

Energy mix for ELFA applications

In addition to the electrical components, a hybrid drive generally comprises a power source – such as an internal combustion engine or a fuel cell – and an energy storage device such as a battery or an ultracapacitor. Using the ELFA traction system, vehicle manufacturers can fulfill all of their power mix requirements.


elfa energiemix siemens

Hybrid drive with internal combustion engine

With this hybrid drive, the power comes from a generator that is driven by an internal combustion engine. Energy storage devices are used to recover the braking energy. The power of the energy storage device, e.g. the battery or ultracapacitor, is combined with the traction motor and generator power. Innovative converter technology and intelligent energy management permit the fuel consumption and emissions to be significantly reduced. The attractiveness of the vehicle is further increased due to the fact that noise is reduced and the comfort level improved. An automated start-stop function for the internal combustion engine permits battery operation with no associated emissions - e.g. for sensitive inner-city areas.


Hybrid drive with fuel cell

With this hybrid drive, the energy is generated from a fuel cell. Energy storage devices are used to recover the braking energy. The power of the energy storage device (e.g. battery or ultra capacitor) is combined with the traction motor and the fuel cell power. Innovative converter technology and intelligent energy management allow the fuel consumption to be significantly reduced. The attractiveness of the vehicle is further increased by a significantly lower noise level and improved levels of comfort.


Battery drive

For the battery drive, the energy is provided from just a battery. Modern high-energy batteries have a high power density; whereby it is especially important to note that the kinetic energy of the vehicle can be fed back into the batteries when braking. In conjunction with the innovative ELFA drive and converter technology – coupled with an efficient concept for the auxiliaries, daily range targets for vehicles can be achieved without any intermediate charging. The battery drive has no emissions and also provides a very high degree of comfort as a result of the low noise levels.



Examples for successful projects - our references

Hybrid drive system in buses

elfa hybridantriebssystem referenz siemens

Cities must reduce their CO 2 emissions in order to retain their quality of life. London is getting greener, and Siemens is making the city’s red buses cleaner using hybrid motors



ELFA is making Vienna greener

Our solutions ensure that 12 electric buses can service two routes in Vienna reliably and efficiently.



Download

ELFA: Zero emissions – the cost-effective and smart way