Features of the Particulate Emission and Regenerations of Different DPF's on a Detroit Diesel 2-Stroke Bus Engine

Different Diesel Particle Filters (DPF)*⁾ were tested on a 2-Stroke Detroit-Diesel bus engine 6V 92 TA. The investigations focused on soot burden and regeneration of the DPF with special filter materials. Also examined was promoting the regeneration by: throttling, additive (FBC), oxidation catalytic converter upstream of DPF and the catalytic coating of the filter material. The metrics were the particulate matter emission, its composition and the nanoparticles.

The most important results are:

• The average SOF content in the engine exhaust particulate matter is 77.6 % and the majority of it is emitted as bigger droplets
• The wire-mesh filter catalyst (WFC) - a novel emission reduction technology -substantially curtails the SOF and PM. WFC traps and oxidizes the oil droplets and produces a “dry” soot. This can be very advantageous for the DPF downstream of WFC. (WFC can be also very interesting for 2-S gasoline engines).
• The investigated combinations of: WFC, FBC, throttling and some highly resistant filter materials, offer new potential DPF-systems to fulfill the retrofitting requirements of 2-stroke Diesels.

Successful field regeneration depends upon many parameters, which are variable with the engine operating conditions.

The real-world regeneration and the long time behavior of the DPF-system can be reliably checked only in field tests.