Active Particulate Filter - Technical Progress that Widens the Market for Emission Controls


Sweden based STT Emtec takes another step forward in emission control for heavy and medium-duty diesel engines. The company has developed an active system for diesel particulate filters, which solves the problem with soot particulates by burning them. The system is based on catalytic combustion of diesel fuel injected into the exhaust gases.

 - We build our system using proven mechanical components controlled by an advanced control module designed in-house. Necessary heat is generated over the catalyst in the reaction between oxygen and fuel. One of the main features of the system is flameless regeneration, when soot oxidizes in the filter, says project leader Claes Åkerlund of STT Emtec.

This new active system has been tested in cooperation with the bus operator Connex. A field trial in Sweden has shown good results.

- Being one of the leading bus operators in Europe, we are interested to be in the forefront of the development of new technology, especially when it comes to environmental tasks. We have been following the developments closely in the field trial, and the results exceeded our expectations, says Martin Atterhall, Technical Director at Connex Sweden AB.

For several years STT Emtec has been successful with its DNOx emission control system that reduces emissions of nitrogen oxides (NOx). The company has delivered systems to customers in Europe, Asia, as well as North America, where the North America is the single most important market.

Existing diesel particulate filters have relatively low soot oxidation rates, which has prevented them from being used in many applications. STT Emtec’s new system extends the potential field of use.

The potential market for STT Emtec’s active regeneration system is huge. The market window is now open to more engine and vehicle types than ever before, as it is possible to retrofit vehicles already equipped with passive particulate filters.

STT Emtec in brief
STT Emtec is a fast growing engineering company with more than 20 years experience in the automotive industry. The focus in recent years is on emission control systems and engine performance optimization. Customers are found in Europe, Asia, Australia, South and North America. STT Emtec has long history of in-house product developments by its R&D department. Developments are being conducted in modern engine test laboratories. The Sweden based company employs about 50 people and is represented in England and USA. Turnover in 2003 was close to 90 MSEK, an increase by over 40% since 2002.

Connex Sverige AB – in brief
Connex Sverige AB provides contract-based public transportation to public transport authorities, municipalities and counties throughout the whole of Sweden. The company is specialized in solving passengers´ need of transport through buses, trains, subways, trams and boats. Every day about 1.6 Millions of passengers travel with Connex in Sweden. Security, reliability and service are priorities in the work carried out by 8 200 employees. The Connex Group has provided public transportation throughout the world since 1911 and operates today in around twenty countries.

For more information please contact:
Glenn Berglund Business Area Manager Emission Systems STT Emtec Phone: +46 60 64 10 41 or +46 70 580 68 80
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Active Particulate Filter - Technical Progress that Widens the Market for Emission Controls
Sweden based STT Emtec takes another step forward in emission control for heavy and medium-duty diesel engines. The company has developed an active system for diesel particulate filters, which solves the problem with soot particulates by burning them. The system is based on catalytic combustion of diesel fuel injected into the exhaust gases.
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Visiting address: Njurundavägen 16, 862 40 Njurunda, Sweden. STT Emtec, engine and emission technology.