Technology

Exhaust Gas Recirculation (EGR) / Selective Catalytic Reduction (SCR) Technology

Our breakthrough proprietary technology is the core of our business.

In 1997, we developed and patented the concept of combining Exhaust Gas Recirculation (EGR) with Selective Catalytic Reduction (SCR) to minimize emissions - taking advantage of the benefits each brings for reducing oxides of nitrogen (NOx).

Each of these technologies were developed in the global transportation industry by manufacturers of diesel-powered equipment in order to meet the standards of NOx emissions defined by the Environmental Protection Agency (EPA) and other global environmental regulation agencies.

In the United States, for 2010, diesel engine manufacturers had to come up with a solution to lower the NOx content of their emissions to 0.2 grams of NOx per brake-horsepower-hour (g/bhp-hr).

EGR and SCR are the primary strategies implemented to this point. EGR addresses emissions within the combustion chamber by lowering exhaust gas temperatures while SCR addresses emission reduction through the use of a catalyst and a diesel exhaust fluid (DEF) – a water/urea mixture – to lower NOx.

As legislation tightens across the globe, we believe combining EGR with SCR is a key solution to meet strict NOx requirements. Previously seen as competing approaches, combined EGR/SCR enables users to meet strict NOx levels outlined by the U.S. 2010 and Euro 6 / VI emission standards. The EGR system can be activated to reduce NOx when starting a cold engine, while 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 for optimum fuel efficiency with greater reductions in emissions.

We were awarded the 2009 Excellence in Technology of the Year Award for the combined use of EGR and SCR by Frost and Sullivan.

Frost & Sullivan recognizes CDTi's innovation and thought leadership for the combined use of EGR and SCR to meet new emissions regulations while providing fuel economy and reducing fleet carbon footprint. Each year, Frost & Sullivan presents this award to the company that has pioneered the development and introduction of an innovative technology in the market; a technology that has either impacted or has the potential to impact several market sectors. This technology is expected to bring significant contributions to the industry in terms of adoption, change, and competitive posture. It also recognizes the company's overall technical excellence and its commitment toward technology innovation.