This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Assessment and Comparison of De-Throttling Approaches and Technologies for Further Reductions in Fuel Consumption in a Modern GDI Engine
Technical Paper
2017-01-2224
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The paper outlines the fuel consumption benefits available from de-throttling technologies that can help to bring gasoline engine efficiency on a par with that of diesel engines. The paper shows the relative efficiency improvements offered by a fully-variable intake valve lift system in conjunction with wide-range cam phasers, which also incorporate the facility to provide zero valve lift to enable cylinder deactivation. Testbed results recorded with a prototype concept engine show the degree to which early intake valve closing, valve overlap and cylinder deactivation can work together, and the limitations of this synergy at different operating conditions. The paper demonstrates the potential of a production-feasible 2.0 litre Central GDI engine to deliver in excess of 105kW/litre, and yet to achieve less than 300g/kW.h BSFC at 2000/2.0bar BMEP with λ=1.0 fueling - an efficiency value which is competitive with diesel engine efficiencies, whilst offering the cleaner combustion, and simpler, more robust aftertreatment processes inherently afforded with positive ignition gasoline engines, utilizing pre-mixed flame stoichiometric combustion.
Recommended Content
Authors
Topic
Citation
Freeland, P., Jones, G., Chen, R., Huang, L. et al., "An Assessment and Comparison of De-Throttling Approaches and Technologies for Further Reductions in Fuel Consumption in a Modern GDI Engine," SAE Technical Paper 2017-01-2224, 2017, https://doi.org/10.4271/2017-01-2224.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Meisel , J. An Analytic Foundation for the Toyota Prius THS-II Powertrain with a Comparison to a Strong Parallel Hybrid-Electric Powertrain SAE Technical Paper 2006-01-0666 2006 10.4271/2006-01-0666
- Korte V. ; Hall J. ; Taylor J ; Raatz T. et al. Anforderungen an den Ladungswechchsel und die Audladung bei extremen Downsizing, 4 MTZ-Fachtagung “Ladungswechsel im Verbrennungsmotor” 2011
- Freeland P. ; Taylor J. ; Oudenijeweme D. , Stansfield P. et al. Advanced technologies for Downsized direct injection gasoline engines Thiesel 2012 Conference on Thermo- and Fluid Dynamic Processes in Direct Injection Engines
- Habermann , K. et. al. Gemischt-sequenzielle Aufladung am Motor mit getrennten Auslassfluten und vollvariablem Ventiltrieb 9 MTZ- Fachtagung Ladungswechsel im Verbrennungsmotor Stuttgart 2016
- Breuer , M. ; Grimm , K. ; Moormann , S. ; Schmitt , S. Weiterentwicklung des vollvariablen Ventiltriebs UniValve 6 VDI- Fachtagung Ventiltrieb und Zylinderkopf Würzburg 2015
- Breuer , M. ; Grimm , K. ; Schmitt , S. ; Hunkel , D. Developmnt of a fully variable valve train to production readiness MTZ worldwide 78 2017 2 2017