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At present, the emissions of internal combustion engine can only be improved  by catalytic treatments of the exhaust gases. Such treatments, however,  result in high costs and relatively low conversion efficiency. This suggests  that a new combustion technique should be developed to yield improved primary  combustion processes inside the engine with drastically reduced exhaust gas  emissions. To fulfill all requirements, Dr. Franz Drust has proposed a new  combustion concept to perform homogenous combustion in internal combustion  engines. This concept used the porous medium combustion technique and is  called “PM-engine”. It is shown that the PM combustion technique can be  applied to internal combustion engines. Theoretical considerations are  presented for internal combustion engines, indicating that an overall  improvement in thermal efficiency can be achieved for the PM-engine. This is  explained and general performance of the new PM-engines is demonstrated for a  single cylinder, water cooled, direct injection diesel engine. Verification  of experiments at primary stage is described that were carried out as a part  of the present study.

Analysis of internal combustion engine with a new concept of porous medium combustion for the future clean engine