Effect of DOC Carrier Length on Emission Performance of Diesel Engine

Abstract:

Based on lightduty diesel engine bench test platform, the effect of the length of diesel oxidation catalyst’s(DOC) carrier on the emission reduction performance of aftertreatment system was studied. The results show that, increasing the length of the DOC’s carrier can increase the oxidation rate of carbon monoxide(CO), total hydrocarbons(THC) and nitric oxide(NO). However, excessive increase in the length of the DOC carrier has limited improvement on the oxidation performance and will reduce the emission reduction effect of DOC under low temperature and low load. The reduction rate of DOC coupled catalyzed diesel particulate filter(CDPF) on particle number(PN) is less affected by the length of the DOC carrier. From the perspective of balancing cost and performance, appropriately increasing the length of the DOC carrier can effectively improve the emission reduction effect, but the excessive increase has little effect on the improvement of emission reduction effect.