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Hohenberg, Guenter
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Development and Application of a Virtual Soot Loading Sensor

Darmstadt University of Technology-Christian Landgraf, Guenter Hohenberg
Umicore Automotive Catalysts-Egbert Lox, Barry Van Setten, Nicola Soeger, Paul Spurk
  • Technical Paper
  • 2004-05-0413
Published 2004-05-23 by Society of Automotive Engineers of Korea in South Korea
The particulate filter is set to become a widespread system to control particulate matter (PM) emissions from diesel-powered engines. Whereas trapping of soot is easy in general - there do exist a multitude of filtering substrates, offering high efficiencies on dry soot - attention has to be paid to the question of the regeneration process including its initiation, which is still not satisfactorily solved.The soot loading condition and thus the initiation of regeneration process is normally controlled by exhaust gas pressure loss within the filter. However, this measured value characterizes the level of soot loading only incompletely. The accumulated soot mass has to be limited in order to avoid excessive exothermal regeneration which may lead to a destroyed filter substrate. Based on this, regeneration intervals must be shortened due to safety reasons and product durability.A possible solution and improvement represents the application of a Virtual Soot Loading Sensor. This paper reports on development and application work of this sensor, being currently still under development. The sensor claims the ability to calculate accumulated soot mass during…
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The Effect of Fuel Specifications and Different Aftertreatment Systems on Exhaust Gas Odour and Non-Regulated Emissions at Steady State and Dynamic Operation of DI-Diesel Engines

AVL List GmbH-Paul Zelenka
University of Technology-Eric Hamm, Guenter Hohenberg
Published 1999-10-25 by SAE International in United States
Diesel exhaust gas contains low molecular aliphatic carbonyl compounds and strongly smelling organic acids, which are known to have an irritant influence on eyes, nose and mucous membranes.Thus, diesel exhaust aftertreatment has to be considered more critically than that of gasoline engines, with respect to the formation of undesired by-products.The results presented here have been carried out as research work sponsored by the German Research Association for Internal Combustion Engines (FVV).The main objective of the three year project was to evaluate the behaviour of current and future catalyst technology on the one hand (oxidation catalyst, CRT system, SCR process), and regulated and certain selected non-regulated exhaust gas emission components and exhaust gas odour on the other hand.Modern DI-diesel engines for both passenger cars and HD trucks were investigated in combination with an olfactometer, specially developed for this purpose, whose principle is also described in the paper.
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