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Self-cleaning trap configurations have been developed and evaluated for removing particulate emissions from diesel engine exhaust streams. The main feature of this approach is that the traps are being cleaned continuously using compressed air, and thus, do not require thermal or catalytic regeneration to remove the collected particles. The results of this study indicate that the present system, employing ceramic wall flow monolith filters, performs well in simultaneously filtering the exhaust and removing the captured particles from the filter element into a fabric bag. Successful cleaning of the trap was evidenced by a quasi-steady state behavior of the exhaust back pressure that was reached in a fairly short period of time.

A rotating, self-cleaning particulate trap device has been developed and tested coupled with the exhaust of a single cylinder compression ignition engine. This trap design does not require thermal regeneration to burn the collected particles. Instead, it involves a continuous self-cleaning process, thereby eliminating some of the most persistent problems associated with material failure during regeneration. Captured particulates are blown out of the trap in a reverse flow configuration and they are collected on a fabric filter. Initial tests at high engine loadings showed that the system performs satisfactorily, although further improvements are necessary to render the device suitable for long term applications. Numerical modelling techniques are also employed to study the flow patterns in the trap assembly and aid in the optimization of the system.