Attractiveness of gas-powered engines growing – HJS Emission Technology launches 2-part exhaust-gas aftertreatment concept for Daimler gas drives

Katalysator CNG

Developing drive systems that are as economical and eco-friendly as possible is one of the most important challenges currently facing engine manufacturers. Not least since the Euro VI standard came into force on 1 January 2014 – upping emissions limits even more –, pollutant emissions have to be reduced drastically once again. In addition to initiatives to further advance diesel and petrol drives, demand for gas-driven engines is also on the rise.

One of the leaders in the field of gas engine development is Daimler-Benz. Specifically with Daimler's Euro VI gas engine in mind, HJS Emission Technology has developed a two-part emissions aftertreatment concept that enables this engine to meet the strict requirements of the Euro VI standard. "Based on a multitude of factors, we can today safely assume that demand for gas-powered engines will continue to rise in future", says Michael Himmen, member of the board of management at HJS. "The price of gas is very stable and this fuel is available in abundance in, for instance, Russia and the EU states of eastern Europe. Moreover, fracking technology, as now increasingly being employed in the USA, is making gas very cheap and the idea of converting entire vehicle fleets there extremely attractive." What's more, gas is a very clean fuel, whose combustion produces no particulate matter. As a result, there's no need to install a particulate filter, either.
The big challenge as regards gas drives is the fact that natural gas contains methane in high concentrations – and methane is classified as a pollutant in the Euro VI standard. For this reason, these engines are subject to extremely strict limits, which can only be complied with by using special exhaust-gas aftertreatment systems. The two-part system developed by HJS comprises a catalytic converter installed next to the engine, immediately downstream of the turbocharger, and a primary catalytic converter installed on the chassis. HJS Emission Technology will be launching this new system at this year's IAA Commercial Vehicles in Hanover (Hall 13, Stand C41).

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