Flexible Heating and Heat Retention for Future Exhaust Gas Aftertreatment
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Fraunhofer ISE
Flexible Heating and Heat Retention for Future Exhaust Gas Aftertreatment The improvement of the cold-start properties of combustion engines is a basic requirement for compliance with future new emission legislation. The fuel preparation technology CatVap developed at Fraunhofer ISE allows to quickly and efficiently heat and condition the exhaust gas after treatment system and thus reduce emissions.
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A U T HOR S
Robert Szolak is Head of the process development group focusing on emissions reduction, catalysis and the use of renewable fuels in application at Fraunhofer ISE in Freiburg (Germany).
Bernd Danckert is a powertrain and emissions expert and General Manager of ICCL Ltd. in Paphos (Cyprus).
Florian Rümmele is a specialist for catalysis and fuels and project manager in the process development group at Fraunhofer ISE in Freiburg (Germany).
In the future, powertrains with internal combustion engines will only be accepted by the general public if emissions of such vehicles continually and drastically decrease through the use of highly efficient Exhaust Aftertreatment (EAT) systems and renewable fuels [1, 2]. In the long term, the emissions produced by vehicles must be reduced to almost zero; in the short term, above all the harmful components in the relevant driving cycles must be reduced. The demands of cold starts and shortdistance operation, but also hybridization, are calling for new technologies that enable effective exhaust gas aftertreatment [3–5]. The fastest possible and efficient heating and heat retention of EAT systems is a basic requirement for compliance with future new emissions legislation. This is valid for the legislation to be applied in Europe (Euro VII: commercial vehicles, Euro 7: passenger cars) from about 2025 onward as well as for the legislation to be applied in the USA (ultra-low NOx – CARB/EPA). The latter is already as good as determined, at least in California, and is also being discussed in Europe. Especially the associated introduction and increase of the so-called cold-start, cold-low load and short distance shares in future test cycles require the fastest and highest possible efficien cy of the EAT system within the shortest possible time. The development of such heating systems for EATs and their components is currently one of the greatest challenges. Within the scope of hydrogen technologies research, Fraunhofer ISE is intensively developing new EAT heating technology. The result is the fuel preparation technology CatVap, g
MTZ worldwide 01|2021
Paul Beutel is Project Manager in process and prototype development for the CatVap technology in the process development group at Fraunhofer ISE in Freiburg (Germany).
a catalytically operating EAT heating and conditioning system directly driven by fuel. Together with renewable fuels, this approach has a high potential for sustainable and lowest emission mobility. The technology is currently being pre-developed with tier-1 and tier-2 de velopment partners such
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