This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Transient Control of a Dedicated EGR Engine
Technical Paper
2016-01-0616
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Southwest Research Institute (SwRI) has successfully demonstrated the cooled EGR concept via the High Efficiency Dilute Gasoline Engine (HEDGE) consortium. Dilution of intake charge provides three significant benefits - (1) Better Cycle Efficiency (2) Knock Resistance and (3) Lower NOx/PM Emissions. But EGR dilution also poses challenges in terms of combustion stability, condensation and power density. The Dedicated EGR (D-EGR) concept brings back some of the stability lost due to EGR dilution by introducing reformates such as CO and H2 into the intake charge. Control of air, EGR, fuel, and ignition remains a challenge to realizing the aforementioned benefits without sacrificing performance and drivability. This paper addresses the DEGR solution from a controls standpoint. SwRI has been developing a unified framework for controlling a generic combustion engine (gasoline, diesel, dual-fuel natural gas etc.). The controller is factored into three parts - (a) The first part is physics-based and it incorporates engine topology to formulate a dynamical model connecting flows (air, EGR etc.) to engine states (pressure, oxygen fraction etc.). This part of the controller essentially inverts the dynamical model to determine flows to drive states to targets. (b) The second part is experimental and it synthesizes a multi-port device description connecting actuators to individual flows. (c) The third part pertains to fueling and ignition. The fuel quantity and split is based on the states (such as oxygen mass and oxygen fraction). The ignition timing and energy is based on the fuel quantity and the states (incorporating such effects as EGR dilution, fuel dilution, and presence of reformates). In this paper, an overview of the controller architecture and its successful application to a DEGR engine is presented.
Recommended Content
Authors
Topic
Citation
Sarlashkar, J., Rengarajan, S., and Roecker, R., "Transient Control of a Dedicated EGR Engine," SAE Technical Paper 2016-01-0616, 2016, https://doi.org/10.4271/2016-01-0616.Also In
References
- Alger , T. and Mangold , B. Dedicated EGR: A New Concept in High Efficiency Engines SAE Int. J. Engines 2 1 620 631 2009 10.4271/2009-01-0694
- Gukelberger , R. , Gingrich , J. , Alger , T. , and Almaraz , S. LPL EGR and D-EGRĀ® Engine Concept Comparison Part 2: High Load Operation SAE Int. J. Engines 8 2 547 556 2015 10.4271/2015-01-0781
- Chadwell , C. , Alger , T. , Zuehl , J. , and Gukelberger , R. A Demonstration of Dedicated EGR on a 2.0 L GDI Engine SAE Int. J. Engines 7 1 434 447 2014 10.4271/2014-01-1190
- Nishio , Y. , Hasegawa , M. , Tsutsumi , K. , Goto , J. et al. Model Based Control for Dual EGR System with Intake Throttlein New Generation 1.6L Diesel Engine SAE Technical Paper 2013-24-0133 2013 10.4271/2013-24-0133
- Iwadare M. and Ueno M. Multi-Variable Air-Path Management for a Clean Diesel Engine Using Model Predictive Control 4970 1 764 773 2009
- Shirawaka , T. , Miura , M. , Itoyama , H. , Aiyoshizawa , E. et al. Study of Model-based Cooperative Control of EGR and VGT for a Low-temperature, Premixed Combustion Diesel Engine SAE Technical Paper 2001-01-2006 2001 10.4271/2001-01-2006
- Sarlashkar , J. , Sasaki , S. , Neely , G. , Wang , J. et al. An Airflow-Dominant Control System for Future Diesel Engines SAE Technical Paper 2007-01-2070 2007 10.4271/2007-01-2070
- Millo , F. , Pautasso , E. , Pasero , P. , Barbero , S. et al. An Experimental and Numerical Study of an Advanced EGR Control System for Automotive Diesel Engine SAE Int. J. Engines 1 1 188 197 2009 10.4271/2008-01-0208
- Asad , U. and Tjong , J. A Zero-Dimensional Intake Dilution Tracking Algorithm for Real-Time Feedback on Exhaust Gas Recirculation SAE Int. J. Engines 8 4 1856 1865 2015 10.4271/2015-01-1714
- Luenberger D. Observers for multivariable systems IEEE Trans. Automat. Contr. 11 2 190 197 1966