This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Optimization of the Exhaust Aftertreatment System of a Heavy Duty Diesel Engine by Means of Variable Valve Timing
Technical Paper
2019-24-0143
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
In view of the current political debate, it can be assumed that the nitrogen oxide limits for commercial vehicles will be further reduced. This is also demonstrated by the currently voluntary certification of the CARB Optional Low NOX legislation, which requires nitrogen oxide emissions of 0.027 g/kWh. This corresponds to a reduction of 93 % compared to the current EU VI standard. Therefore, the optimization of EAT systems represents an essential research focus for future commercial vehicle applications.
One way to optimize the EAT system may be the usage of variable valve actuation. Existing investigations show an exhaust gas temperature increase with intake valve timing adjustment, also known as Miller timing. But the authors conclude that it cannot accelerate the warm up process. With regard to the effects on the exhaust aftertreatment system and the resulting tailpipe emissions, only improved HC and CO oxidation could be identified so far. In addition, a potential for improved NOX reduction is expected in the exhaust gas temperature increase.
Therefore, further investigations have been carried out. The investigations presented in this paper are based on test bench measurements of characteristic points in the WHTC on a single-cylinder commercial vehicle engine, which are then evaluated by a detailed pressure analysis. In combination with validated simulation models of a commercial vehicle series engine and its exhaust aftertreatment system, the effects of the Miller timing on the exhaust aftertreatment are investigated. The results show an improved SCR efficiency, DPF regeneration and also a decreased EAT cool down in the partial load range. Additionally, a change in the NO2/NOX ratio before the SCR system can be detected. This leads to lower nitrous oxide emissions, given by a suitable choice of valve timing. Therefore, variable valve timing can contribute to fulfil future emission legislations.
Recommended Content
Authors
Topic
Citation
Betz, M. and Eilts, P., "Optimization of the Exhaust Aftertreatment System of a Heavy Duty Diesel Engine by Means of Variable Valve Timing," SAE Technical Paper 2019-24-0143, 2019, https://doi.org/10.4271/2019-24-0143.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 | ||
| Unnamed Dataset 5 |
Also In
References
- DieselNet Emission Standards; EU: Heavy-Duty Truck and Bus Engines https://www.dieselnet.com/standards/eu/hd.php 2019
- California Air Resources Board Heavy-Duty Low NOx Program https://www.arb.ca.gov/msprog/hdlownox/hdlownox.htm 2019
- European Commission Reducing CO 2 Emissions from Heavy-Duty Vehicles https://ec.europa.eu/clima/policies/transport/vehicles/heavy_en#tab-0-0 2019
- Miller , R.H. Supercharging and Internal Cooling Cycle for High Output ASME Transactions 69 453 457 1947
- Miller , R.H. and Lieberherr , H.U. The Miller Supercharging System for Diesel and Gas Engines Operating Characteristics International Congress of Combustion Engine Conference CIMAC 787 803 1957
- Gehrke , S. , Weiskirch , C. , and Eilts , P. Development and Implementation of a Variable Valve Actuation System to a HD Diesel Engine SAE Technical Paper 2008-01-1359 2008 10.4271/2008-01-1359
- Gehrke , S. 2015
- Gehrke , S. , Kovács , D. , Eilts , P. , Rempel , A. et al. Investigation of VVA-Based Exhaust Management Strategies by Means of a HD Single Cylinder Research Engine and Rapid Prototyping Systems SAE Int. J. Commer. Veh. 6 1 47 61 2013 10.4271/2013-01-0587
- Kovács , D. and Eilts , P. Potentials of the Miller Cycle on HD Diesel Engines Regarding Performance Increase and Reduction of Emissions SAE Technical Paper 2015-24-2440 2015 10.4271/2015-24-2440
- Kovacs , D. and Eilts , P. Potentials of Miller Cycle on HD Diesel Engines Using a 2-Stage Turbocharging System SAE Technical Paper 2018-01-0383 2018 10.4271/2018-01-0383
- Edward , S. , Eitel , J. , Pantow , E. , and Lutz , R. Emissionskonzepte und Kühlsysteme für Euro 6 bei schweren Nutzfahrzeugen MTZ 69 690 2008
- Schenk , C. , Sanchez , L. , Moulis , C. , and Laroo , C. HD Diesel Thermal Management Improvements toward Meetinf 2010 Standards SAE Technical Paper 2007-01-0230 2007 10.4271/2007-01-0230
- Spurk , P. , Pfeifer , M. , van Setten , B. , Söger , N. et al. Examination of Engine Control Parameters for the Regeneration of Catalytic Activated Diesel Particulate Filters in Commercial Vehicles SAE Technical Paper 2003-01-3177 2003 10.4271/2003-01-3177
- Pfeifer , A. , Holz , O. , and Graf , G. New Generation of the Liebherr Diesel Engines D934/D936, Fulfilling Stage IIIB/Tier4i Emission Norms with SCR Technology 6th AVL International Commercial Powertrain Conference Graz 2011
- Ellensohn , R. Real World Emission of a EURO VI Long Haul Truck 6th AVL International Commercial Powertrain Conference Graz 2011
- Schutting , E. , Neureiter , A. , Fuchs , C. , Schatzberger , T. et al. Miller- und Atkinson-Zyklus am Aufgeladenen Dieselmotor MTZ Motortech Z 68 480 2007 10.1007/BF03227416
- Codan , E. and Vlaskos , I. Die Aufladung von Mittelschnelllaufenden Dieselmotoren mit extrem frühen Miller-Steuerzeiten 9. Aufladetechnische Konferenz Dresden
- Hirschmann , S. , Malischewski , T. , Haubold , U. , and Tilch , B. Variable Valve Trains in Heavy-Duty Engines - Benefit and Design MTZ Conference Heavy Duty, On- and Off-Highway Engines Ulm 2016
- Weberskirch , D. , Hyna , D. , Malischewski , T. , Hirschmann , S. , and Dressel , T. Variable Ventiltriebe in Heavy-Duty-Motoren - Ermittelte Potenziale mit Miller-Steuerzeiten MTZ Conference Ladungswechsel im Verbrennungsmotor Stuttgart 2017
- Böckenhoff , E. and Hermann , H.-O. Der Ladungswechsel bei der neuen Generation von Daimler Trucks Nutzfahrzeugmotoren MTZ Conference Ladungswechsel im Verbrennungsmotor Stuttgart 2017
- Brauer , M. , Pohlke , R. , Schmidt , V. , Elicker , M. et al Schaltbare Ventiltriebselemente in Dieselmotoren als Beitrag zur Erfüllung der RDE-Gesetzgebung MTZ Conference Ladungswechsel im Verbrennungsmotor Stuttgart 2017
- McCarthy J. , Theissl H. , and Walter L. 2017 Improving Commercial Vehicle Emissions and Fuel Economy with Engine Temperature Management using Variable Valve Actuation Liebl , J. Beidl , C. Internationaler Motorenkongress 2017, Proceedings Springer Vieweg, Wiesbaden 10.1007/978-3-658-17109-4_39
- Honardar , S. , Deppenkemper , K. , Nijs , M. , and Pischinger , S. Potenziale von Ladungswechselvariabilitäten am PKW-Dieselmotor MTZ Motortech Z 75 64 2014 10.1007/s35146-014-0540-0
- Deppenkemper , K. , Günther , M. , and Pischinger , S. Potenziale von Ladungswechselvariabilitäten beim Pkw-Dieselmotor II MTZ Motortech Z 78 70 2017 10.1007/s35146-016-0194-1
- Theißl , H. , Kraxner , T. , Seitz , H.F. et al. Miller-Steuerzeiten für zukünftige Nutzfahrzeug-Dieselmotoren MTZ Motortech Z 76 18 2015 10.1007/s35146-015-0110-0
- Rößler , M. , Velji , A. , Janzer , C. , Koch , T. et al. Formation of Engine Internal NO 2 : Measures to Control the NO 2 /NO X Ratio for Enhanced Exhaust after Treatment SAE Int. J. Engines 10 4 2017 10.4271/2017-01-1017
- Weiskirch , C. , Gotre , W. , Röthlein , B. , and Rothenaicher , W. The Development of the Common Rail Fuel Injection System Panel Presentation at Stuttgarter Symposium Stuttgart 2017
- Kamasamudram , K. , Henry , C. , and Yezerets , A. N 2 O Emissions from 2010 SCR Systems Panel Presentation at Directions in Engine-Efficiency and Emissions Research Conference Detroit 2011
- Clark , D. and Pauly , T. An Approach to Controlling N 2 O Emission on HDD On-Road Applications SAE Int. J. Engines 9 3 1623 1629 2016 10.4271/2016-01-0948
- Eilts , P. Das Miller- und das Atkinsonverfahren an Verbrennungsmotoren MTZ Conference Ladungswechsel im Verbrennungsmotor Stuttgart 2014