by The Automotive Research Association of India in India
The control over particulate emissions is becoming increasingly important in modern diesel engines for Heavy Duty applications, that will comply to more and more stringent emissions norms. Use of particulate traps is an effective means of achieving this with the need to regenerate the particulate trap being imperative.Passive regeneration using NO2 by conversion of NO, as well as regeneration at lower temperatures with catalyzed DPF and the influence of NOx to soot ratio on this, is the subject of the paper.Both coated and uncoated filters in fresh and aged state are evaluated at temperatures typical of passive NO2 and Oxygen-based soot regenerations and the results discussed.
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by SAE International in United States
Particulate filters are currently the method of choice for reducing soot levels in diesel exhaust to the extremely low levels required for meeting future emission standards. For cost effective, reliable and manageable soot regeneration, the Catalytic Diesel Particulate Filter (CDPF) has proven to be one of the most promising solutions for maintaining filter performance. The activity of the CDPF can help lower soot ignition temperature thereby promoting active, oxygen-based filter regeneration. It can also facilitate passive regeneration of a filter at temperatures below 400 °C through formation of NO2 by catalyzing the oxidation of NO.There are two important factors which affect the passive regeneration of a CDPF. One is the influence of NOX/soot ratio. The other is the deterioration of the catalytic function upon aging. Together they determine the quantity of NO2 available for soot oxidation.In the first part of this publication the impact of model gas, engine and field aging on the catalytic performance of a state of the art CDPF (A) and newly developed CDPF (B) will be reported. A correlation is developed…
Darmstadt University of Technology-Christian Landgraf, Guenter Hohenberg
Umicore Automotive Catalysts-Egbert Lox, Barry Van Setten, Nicola Soeger, Paul Spurk
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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