Development of Partial Filter Technology for HDD Retrofit

The Use of a Partial Flow Filter to Assist the Diesel Particulate Filter and Reduce Active Regeneration Events

“…Due to the differences in terms of flow rate (over 14 times more for the PFF), the pressure increase over the full size PFF could not be directly compared with the pressure recorded over the 1 inch diameter DPF. Nevertheless, a limited pressure increase was recorded over the tests, which is in agreement with other studies that recorded small pressure increases during the use of a PFF [14][15][16]. The reduced soot mass loading, associated with lower pressure increase, show the potential of the PFF/DPF combination to reduce the duration and/or frequency of active regenerations, allowing either a loading time a third longer or a shorter regenerative event to oxidize the lower mass of soot accumulated within the DPF.…”

Low Power Autoselective Regeneration of Monolithic Wall Flow Diesel Particulate Filters

“…Alternative filter substrates such as ceramic foams (~80% filtration efficiency [e.g. 4] ) and partial filters (~50% filtration efficiency [5] ) are of less interest for new engines due to their lower filtration efficiency but can be effective in retro-fit applications [5] .…”

Simulative analysis of flow through exhaust manifold for improved volumetric efficiency of multi cylinder petrol engine

“…One technique is tuned-length primary tubes. This technique attempts to time the occurrence of each exhaust pulse, to occur one after the other in succession while still in the exhaust system (Muramatsu and Furuyama, 1993;Jacobs et al, 2006;Nitin et al, 2001). The lower pressure tail of an exhaust pulse then serves to create a greater pressure difference between the high pressure head of the next exhaust pulse, thus increasing the velocity of that exhaust pulse.…”