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HJS Emission Technology – exhaust-gas aftertreatment partner for Volkswagen Powersystems

Innovative exhaust-gas aftertreatment technology based on sintered metal offers key benefits to users

In cooperation with Volkswagen Powersystems, HJS Emission Technology has for the first time validated a coated, sintered metal particulate filter for series installation that is designed to be mounted immediately downstream of the engine and to ensure compliance with the emissions levels of Stage IIIB (EU Non-road Directive 97/68/EG) and TRGS 554 (applicable in Germany).

The main challenges during development of this exhaust system arose due to the limited amount of installation space available in the machines for which the system is intended and the high demands arising from the additional loads a system installed in such close proximity to the engine will be subjected to. In addition to reliable and stable regeneration of the filters, the critical design criteria included a high ash holding capacity to minimise the number of servicing intervals and good cleanability of the filter. These were also the chief reasons why Volkswagen Powersystems has collaborated closely with HJS and employed the latter's sintered metal filter technology it has now validated for specific applications.

This joint project was kicked off back in the spring of 2010 with the aim of developing a highly durable solution for compliance with the emissions regulations laid down in Stage IIIB.
The unique construction of the SMF^® (sintered metal filter) used gives it an extremely high ash holding capacity, enabling servicing intervals in excess of 7,000 operating hours (depending on engine utilisation) to reduce operating costs significantly. Downtimes are also cut thanks to the degree of simplicity and efficiency with which the filters can be cleaned, and the reusability of the filter modules means they are highly cost-effective. The system has a useful service life of at least 20,000 operating hours as long as it is used as intended. At the same time, continuous regeneration (CRT:Continuous Regeneration Technology) optimises fuel consumption, while the engine's electronic control unit (ECU) monitors and manages the field-proven operational concept.

With regard to emissions Stage IIIB compliance, Volkswagen Powersystems this year began supplying industrial-truck clients with its TDI 2.0 – 455 MD industrial engine, coupled with one of the most innovative exhaust-gas aftertreatment systems currently on the market – giving them a genuinely clean solution. As a result, non-road machinery manufacturers who source VW industrial engines are already in a position to install engines in their machinery that fulfil the even more stringent PM limits already agreed for future emissions legislation.

The SMF^®-based exhaust-gas aftertreatment system from HJS, developed and homologated for this 2.0-l common rail engine will in future be a standard component of Volkswagen's modular parts kit for its industrial engines and from 2013 will be installed as original equipment in all applications configured to meet Stage IIIB.