Partikelfiltersysteme für Diesel-Pkw

Herrmann, Hans-Otto; Mikulic, Ingo; Lang, Oliver; Scholzist, Volker

doi:10.1007/bf03226593

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…Out of the numerous regeneration techniques suggested over the last 20 years, those employing m dynamic viscosity (Pa s) catalytic aids have led to more workable solutions (fuel doping [2,3] or a catalytically coated filter [4,5]). The r density (kg/m3) additional potential of electronic engine management is exploited in the so-called 'active regeneration systems' [6 ], where the onset of regeneration is controlled by the it is necessary to monitor in some way the accumulated measurement and brings the need to derive a valid correlation between soot mass and other, directly measurable variables such as pressure drop and exhaust gas temperature. However, the pressure drop signal is affected by numerous parameters and carries a lot of information that is difficult to be deciphered to extract information pertaining to the soot loading level.…”

Section: Rementioning

confidence: 99%

“…The VOF performed to a loaded SiC filter. The filter is loaded with of the particulate layer has been calculated to vary from the engine running on a medium operation point (speed, about 6 per cent at the central to 9 per cent at the circum-2600 r/min; load, 40 N m; exhaust gas mass flowrate, ferential channels [12] and may be oxidized at tempera-45 g/s), up to the two soot loading levels given in Table 4.…”

Section: Effect Of a Catalyst Made Up Of Individual ( Laminar) Jets That Interact As Thementioning

confidence: 99%

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Flow maldistribution measurements in wall-flow diesel filters

Stratakis

Stamatelos

2004

Proceedings of the Institution of Mechanical Engineers, Part D:

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Understanding the flow maldistribution phenomena inside porous ceramic diesel particulate filters and their effects on the pressure drop and regeneration characteristics is important for the successful design and modelling of this class of exhaust aftertreatment system. In this paper the results from an experimental study of flow distribution in wall-flow diesel filters are presented. The experiments were performed on a specially designed cold flow test rig, under steady state flow conditions. The flow distribution at the exit of cordierite and SiC filters were measured with a hot film velocity sensor under low and medium mass flowrate conditions. The system configuration was varied to incorporate tests with and without the installation of an oxidation catalyst before the filter in order to investigate the effect of the catalyst honeycomb structure to the measured flow distribution. Flow distribution in filters loaded with various levels of particulate mass was also measured using the same device. The filters were loaded in a modern diesel engine run on catalyst-doped fuel up to different backpressure levels. A flow uniformity index was adopted in order to quantify the measured flow maldistribution by a single number for each case. The velocity distribution at the exit of the filters is found to be significantly affected by certain design and operating parameters of the system: diffuser-catalyst-filter. The results of this work aim to give a better assessment of the magnitude of flow maldistribution in diesel filters, which severely distort their pressure drop characteristics and affect the distribution of collected soot mass. In this way, a previously neglected aspect of the complex three-dimensional filter regeneration behaviour is better understood.

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Section: Rementioning

confidence: 99%

Section: Effect Of a Catalyst Made Up Of Individual ( Laminar) Jets That Interact As Thementioning

confidence: 99%

Flow maldistribution measurements in wall-flow diesel filters

Stratakis

Stamatelos

2004

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Wird der Diesel-Oxidations-Katalysator vor einem Diesel-Partikelfilter (DPF) angeordnet, fördert das gebildete NO 2 auch noch die Niedertemperatur-Rußoxidation [3]. Im Falle nacheingespritzter Kohlenwasserstoffe erhöht der C x H y -Umsatz die Abgastemperatur [4], was zum Beispiel den Rußabbrand im Partikelfilter begünstigt. Somit ist der Diesel-Oxidations-Katalysator ein emissionsrelevantes Bauteil, welches im Rahmen der vorgeschriebenen On-Board-Diagnose (OBD) mithilfe eines Sensors überwacht werden muss [5].…”

Section: Hintergrundunclassified

2.2.3 - Thermoelektrischer Kohlenwasserstoffsensor in Dickschichttechnik mit Pt | PtRh Thermopile zur On-Board- Diagnose eines Diesel-Oxidations-Katalysator

Wiegärtner¹,

Hagen²,

Kita³

et al. 2016

Tagungsband

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“…A DOC is essential for providing the temperature needed for the discontinuous regeneration of a diesel particulate filter (DPF). Delayed post‐injections increase the exhaust gas temperature up to 650 °C by means of oxidation at the catalyst; at this temperature, soot can be combusted into carbon dioxide (CO 2 ) and ash , . Furthermore, the DOC positively affects the efficiency of the selective catalytic reduction (SCR) process because it improves the ratio of nitrogen dioxide (NO 2 ) to nitric oxide (NO) .…”

Section: Introductionmentioning

confidence: 99%

Ion‐Molecule Reaction for the Selective Detection of Hydrocarbons in Diesel Exhaust Gas

Kaspar

Rabl

Mayer

2018

Chemie Ingenieur Technik

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The hydrocarbons present in the diesel exhaust gas are analyzed. A mass spectrometer is used for the measurements, and it operates on the basis of an ion‐molecule reaction. This method is especially suitable because it is selective, is as free of fragments as possible, and is highly sensitive to the species that need to be measured. The study shows that numerous hydrocarbons in diesel exhaust gas can be identified. In particular, three molecules, ethyne, ethene and propene, were analyzed online in‐depth on an engine test bench under different engine operating conditions.

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Partikelfiltersysteme für Diesel-Pkw

Cited by 11 publications

References 4 publications

Flow maldistribution measurements in wall-flow diesel filters

Flow maldistribution measurements in wall-flow diesel filters

2.2.3 - Thermoelektrischer Kohlenwasserstoffsensor in Dickschichttechnik mit Pt | PtRh Thermopile zur On-Board- Diagnose eines Diesel-Oxidations-Katalysator

Ion‐Molecule Reaction for the Selective Detection of Hydrocarbons in Diesel Exhaust Gas

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