Reducing NOx emissions from diesel engines supercharged with pressure wave compressor driven by the electric motor.

The overwhelming parts of the modern Diesel engines for vehicles are supercharged. However, the supercharging process lead to generating a significant amount of NOx emissions. Therefore, the supercharging intensity may be intentionally limited in order to avoid increasing NOx emissions excessively, as these emissions are drastically limited by the Euro 6 pollution standard. By moving from Euro 5 to Euro 6, the NOx emission's permissible limits have been reduced by up to 80%. These reductions of NOx emissions were made possible mainly due to the utilization of the some conventional equipment and procedures presented in the paper. Diesel engine's supercharging could be realized efficiently also with pressure wave compressor (PWC). The paper highlights the possibility of realizing the EGR process directly through the PWC. The concept of supercharging with PWC leads to a significant reduction of NOx, for a significant increase of both the pressure and temperature of the intake air. [ABSTRACT FROM AUTHOR]