Exhaust gas recirculation (EGR)

The reduction of pollutant emissions—particularly of nitrogen oxide emissions in diesel engines—is an important task within the development process. Engine-internal methods such as exhaust gas recirculation seek to reduce raw emissions during combustion itself.

One approach to meeting the new NOx (nitrogen oxide) emissions limits is to incorporate cooled exhaust gas recirculation (EGR). This involves extracting a portion of the main exhaust flow between the engine outlet and the turbine, cooling it in a special heat exchanger, and feeding it back to the intake air downstream of the charge air cooler. The combustion temperature in the engine is thereby lowered, thus reducing the formation of NOx. Our EGR coolers offer exceptional thermomechanical strength, reduced tendency to sooting, and outstanding specific performance. Thanks to the use of high-performance winglet tubes, extremely stable EGR temperatures—and thus improved EGR control—can be achieved.