Abstract
Exhaust emission legislation is being tightened worldwide, with the added complication of different regulations in Europe, the USA and Japan, demanding not only the continuing development of existing technologies, but also the use of new systems, especially in the area of exhaust gas treatment for diesel engines. To meet the various boundary conditions, therefore, the engine development department of the BMW Group has developed different emission technologies that are best able to resolve this conflict of aims. With the maintenance-free particle filter system, NOx storage catalyst and the SCR system, BMW has developed a modular emission system which not only retains the virtues of the BMW diesel drivetrains, but also permits the successful deployment of these diesel engines in the USA and Canada.
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