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Application Strategies of Leannox Catalyst Systems to Diesel Passenger Cars
Published January 01, 1998 by Institution of Mechanical Engineers in United Kingdom
Since the end of the eighties passenger car diesel engine technology is characterized by significant and constant progress with regard to performance, fuel efficiency, engine noise, exhaust gas emission level a.o. The application of advanced engine design like multivalve technology, high-performance fuel injection equipment, direct injection, electronic engine control, EGR, improved oxidation catalyst - only to mention a few examples - offered the possibility to launch an increasing number of passenger car diesel vehicles very successfully on the European market. Today modern diesel engines are characterized by increased driving fun - due to the high torque at low engine speed characteristic, combined with very high fuel economy.
Despite all technical progress future European exhaust emission legislation for passenger cars will keep up or even increase the pressure on further optimization of engine and exhaust gas aftertreatment technology. Especially the already proposed step IV of the European exhaust emission legislation, which foresees to cut down step III values up to 50%, will be a very high hurdle to take. This target will require especially from the exhaust gas aftertreatment systems a significant contribution because from today's point of view only engine internal measures will not offer a sufficient potential for the required future exhaust gas emission levels, especially with high weight vehicles.
Within this paper the application of active LeanNOx catalyst systems to passenger car diesel engines is presented. Besides a brief overview about today's available catalyst technology the paper focuses especially on the design of active LeanNOx catalyst systems and the application of such systems to diesel engines. A final outlook will try to outline the future potential of these systems