ProductsEGR-SCRIn 1997, Clean Diesel developed and patented the concept of combined EGR and SCR to minimize emissions and take advantage of the benefits each can bring in terms of NOx reduction (US patent 5,924,280 and European patent EP998625).
Clean Diesel has lowered the barriers for use of this approach, which is elegant in its simplicity, by enabling licensees such as Robert Bosch GmbH, Tenneco Inc., and Hilite International to pass this EGR-SCR license through to their SCR customers. Alternatively, the technology can be licensed directly from Clean Diesel. This enables EGR-SCR combinations to be practiced industry-wide.
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As legislation tightens across the globe, Enhanced Gas Recirculation (EGR) in combination with Selective Catalytic Reaction (SCR) is soon to become a mainstream solution. Previously seen as competing approaches, combined EGR-SCR allows users to meet strict NOx levels outlined by the US 2010 and Euro 6 / VI emission standards. The EGR system can be activated to reduce NOx when starting a cold engine. The SCR operates at a higher temperature when the catalyst is fully active and at low EGR rates. With both EGR and SCR in place, engines can be fine-tuned to deliver improved fuel efficiency and greater emissions reduction. 
