In modern engine design, recent advances in turbocharger technology as well as fuel injection allowed an enormous increase in specific power and torque. Downsizing and downspeeding are nowadays well known measures to further extend the vehicles' fuel efficiency whilst avoiding to compromise safety, comfort, and fun to drive. However, these technologiesrepresent a marked impact on NVH-behaviour of engines and in particular of exhausts. Furthermore, stringent emission legislation enforces engine calibration schemes such as catalyst pre-heating and particulate filter regeneration which evoke negative acoustic side effects. Hence, the design of the exhaust system requires more effort to achieve customer acceptance, e.g. larger muffler volumes or increased backpressure. Within this paper, it will be presented, how with modern CAE methods and with the innovative active noise control technology the limitations of conventional exhaust layouts can be overcome.
Innovative active exhaust systems for turbocharged engines
2014
10 Seiten, Bilder, Tabellen, 9 Quellen
Conference paper
English
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