Browse Publications Technical Papers 2014-01-1496

Experimental Study of Catalyzed Diesel Particulate Filter with Exhaust Fuel Injection System for Heavy-Duty Diesel Engines 2014-01-1496

The diesel particulate filter (DPF) is an effective technology for particulate matter (PM) and particle number (PN) reduction. On heavy-duty diesel engines, the passive regeneration by Diesel Oxidation catalysts (DOC) and catalyzed DPFs (CDPF) is widely used for its simplicity and low cost, which is generally combined with the active regeneration of exhaust fuel injection.
This study investigated a DOC-CDPF system with exhaust fuel injection upstream of the DOC. The system was integrated with a 7-liter diesel engine whose engine-out PM emission was below the Euro IV level and tested on an engine dynamometer. PM and PN concentrations were measured based on the Particle Measurement Programme (PMP), and the number/size spectrum for particles was obtained by a Differential Mobility Spectrometer (DMS). The filtration efficiency of DPF on PN was higher than 99% in ESC test, while the efficiency on PM was only 58%. During the active regeneration, a certain amount of diesel fuel was injected into the tailpipe and then oxidized in the DOC. The exotherm of the fuel oxidation, the temperature distribution of the DOC, and the concentrations of gaseous emissions were investigated by analyzing the effects of various factors including fuel injection rate, injector location, DOC inlet temperature and exhaust mass flow rate. Increasing fuel injection rate led to hydrocarbons (HC) slip downstream of the DOC at high space velocity (SV). N2O was generated as a by-product during diesel fuel oxidation in the DOC, especially at the beginning of fuel injection.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 17% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Experimental Study of B20 Combustion and Emission Characteristics under Several EGR Conditions


View Details


The Effect of a Ceramic Particulate Trap on the Particulate and Vapor Phase Emissions of a Heavy-Duty Diesel Engine


View Details


Experimental and Error Analysis Investigation into Dilution Factor Equations


View Details