Retrofit Kit to Reduce NOX and PM Emissions from Diesel Engines using a Low-Pressure EGR and a DPF-System with FBC and Throttling for Active Regeneration without Production of Secondary Emissions

This paper discusses the possibility of equipping Euro 3 and older vehicles with a universal retrofit kit to reduce the NO_X and the PM emissions without producing any secondary effect.

Out of several configurations, the optimal setup for EGR and DPF regeneration was evaluated and tested on a passenger car engine testbench. Stationary results showed that with a low pressure EGR it was possible to reduce the NO_X emissions by more than 50%, and the filtration efficiency of the DPF was greater than 99%.

After various dynamic tests on the test bench to improve the control algorithm, the system was designed to be installed on a garbage truck.