Engine Tests of an Active Diesel Particulate Filter Regeneration System

Catalytic NOx Abatement Systems for Mobile Sources: From Three-Way to Lean Burn after-Treatment Technologies

“…The commercialized DPF regeneration technologies are either additive-based, catalyzed filter-based, or continuous regenerating filter-based. 386 There are many known filter structures that can be used to remove particulates from diesel exhaust, including honeycomb wall-flow filters, wound or packed fiber filters, open-cell foams, sintered metal filters, etc. However, ceramic wall-flow filters have received the most attention.…”

“…These filters are capable of removing over 90% of the particulate material from diesel exhaust and thus can meet this emissions reduction goal. 386 The filter is a physical structure for removing particles from exhaust and the accumulating particles will increase the back pressure from the filter on the engine. Thus particles that accumulate have to be continuously or periodically burned out to maintain an acceptable back pressure level.…”

“…While trapping has been solved, the filter regeneration (soot combustion) is a subject of concern, and actual solutions are not fully optimized. The commercialized DPF regeneration technologies are either additive-based, catalyzed filter-based, or continuous regenerating filter-based . There are many known filter structures that can be used to remove particulates from diesel exhaust, including honeycomb wall-flow filters, wound or packed fiber filters, open-cell foams, sintered metal filters, etc.…”

Strategies for active diesel particulate filter regeneration based on late injection and exhaust recirculation with different fuels

“…Parks et al 7 compared an early postinjection (close to the delayed main injection (MI)) with a late postinjection (80° after top dead center (aTDC)), studied the effect of their implementation in one cylinder or in all cylinders and compared these strategies with fuel injection in the exhaust manifold, upstream of the DPFs. Postinjection at the exhaust stream was also studied by Nickolas et al, 8 who proposed to add a vaporizer, a mixture chamber and a hydrocarbon catalyst. However, this strategy has not been as successful as the in-cylinder postinjection for reasons of volume and prize.…”

“…Finally, different studies have compared DPF regeneration using different fuels, 3–18 although few of them have done it under the engine operating conditions, which are most representative of typical DPF regeneration conditions. 3,14,18 In addition, comparisons presented between soots derived from different fuels are not conclusive.…”