Simulation Study on Influence of Fuel Injection Strategy on Regeneration Performance of Catalytic Particle Filter

Abstract

The influence rule of fuel injection strategy on regeneration performance of catalytic particle filter (CPF) will be studied in this paper, through using system dynamics, GT-POWER and AVL FIRE to build and match respectively the onedimensional complete machine model of D19 high pressure common rail diesel engine of variable geometry turbocharger (VGT) and the three-dimensional simulation model of CPF, which are based upon the 50% load working condition with 3000r/min. The study shows that with the delay of main injection timing, the regeneration rate of CPF gradually increase, simultaneously, residual volume of particulate matter (PM), pressure drop and NO2 of CPF at exit end decrease. At the earlier main injection timing, with increasing exhaust gas recirculation (EGR) rate, regeneration rate of CPF is decreasing and residual volume of PM is increasing dramatically. At the later main injection timing, with increasing EGR rate, PM residual volume shows trend of rise then descend. Adoption of post injection benefits for regeneration of CPF, with delay of post injection timing, pressure drop and PM residual volume of CPF both show trend of rise then descend, the post injection timing corresponding with the best efficiency of CPF regeneration will be forward lead with increasing of EGR rate. Appropriately enhancing amount of post injection will benefit for regeneration of CPF. And, the negative effect of CPF regeneration will be increased when using post injection and later timing to rise EGR rate.