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The pressure wave supercharger Comprex(R) has already found wide scale application to passenger car diesel engines. The ideal throughput characteristic and instantaneous pressure build-up make it an interesting alternative supercharger for all vehicular engines, particularly under stringent emission regulations. A new control mechanism substantially increases pressure and efficiency at part load. And, the ability to promote catalytic post-oxidation in the cellular rotor itself is gaining in attractiveness. Over 1 million kilometers have been logged and 13'000 hours recorded in utility vehicles. This demonstrates that technical maturity, a prerequisite for utility fleet applications, has been attained.

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).

By using diesel engines with high torque and instant response as offered by those with a suitable supercharging system, it proves possible to shift the average operating point close to the engine efficiency optimum. Computer analysis confirmed by chassis dynamometer tests of two car sizes equipped with Comprex charged IDI engines show a potential improvement in fuel economy of 19 - 26%. Comparison is made with a NA engine having equivalent road performance as defined by the acceleration rate.