This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
EGR Response in a Turbo-charged and After-cooled DI Diesel Engine and Its Effects on Smoke Opacity
Technical Paper
2008-01-1677
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Three thermo-wires with amplifying circuits have been developed to measure the time-resolved concentration of the exhaust gas recirculated into the intake manifold by a rotary valve-based exhaust gas recirculation (EGR) system of a diesel engine. Good agreement was found between the EGR rates measured by the temperature based system and a conventional CO2 tracing system. The developed EGR measuring system was used to investigate the EGR transient response in a turbo-charged and after-cooled diesel engine with a real-time measure and control system. The EGR response under EGR valve step change and engine transient operating conditions are discussed.
At first, the engine was running under a certain steady condition with zero recirculated exhaust gas, then the rotary valve opened to maximum within 0.1s to demonstrate the EGR step change behavior. EGR rate and air intake stabilized in 0.5s. The combustion process characterized by the maximal in-cylinder pressure came to stabilization in 1.9s. Because of the in-cylinder thermal lag and combustion fluctuations the transient smoke opacities were much different from those at constant EGR rate operation and increased gradually to stabilization in approximately 5s. So, when EGR system is adopted to realize HCCI combustion this performance lag must to be taken into consideration.
The engine typical transient operations named constant speed and increasing torque (CSIT) operations, were realized by evenly boosting the accelerator so as to make the engine increase torque from 100N·m to 500N·m at constant 1600 rpm. Test results showed that the sudden decrease in air intake (resulted by the turbo-lag) brought a dramatic increase of the pressure drop across the EGR valve and resulted in greater EGR rate which deteriorated the smoke opacity under transient operations. The peak smoke opacity under 16CSIT5 operation (constant 1600 rpm from initial 100N·m to final 500N·m within 5s) with the EGR system controlled by the steady-operation strategies was 3 times that of an engine without EGR. In order to obtain better transient performance of the diesel engine equipped with the EGR, its control strategy must be optimized.
Recommended Content
Authors
Citation
Han, Y., Liu, Z., Zhao, J., Xu, Y. et al., "EGR Response in a Turbo-charged and After-cooled DI Diesel Engine and Its Effects on Smoke Opacity," SAE Technical Paper 2008-01-1677, 2008, https://doi.org/10.4271/2008-01-1677.Also In
References
- Lundqvist Ulf Smedler Gudmund Stalhammar Per A Comparison between Different EGR Systems for HD Diesel Engines and Their Effect on Performance, Fuel Consumption and Emissions SAE Paper, (2000) 2000-01-0226
- Egnell Rolf The Influence of EGR on Heat Release Rate and NO Formation in a DI Diesel Engine SAE Paper, (2000) 2000-01-1807
- Baert R. S. G. Efficient EGR technology for future HD diesel engine emission targets SAE Paper, (1999) 1999-01-0837
- Kohketsu Susumu Mori Kazutoshi Sakai Kenji Hakozaki Takazoh EGR Technologies for a Turbocharged and Intercooled Heavy-Duty Diesel Engine SAE Paper, (1997) 970340
- Zelenka Paul Aufinger Hans Reczek Walter Cartellieri Wolfgang Cooled EGR - A Key Technology for Future Efficient HD Diesels SAE Paper, (1998) 980190
- Hawley J. G. Reduction of steady-state NOx levels from an automotive diesel engine using optimized VGT/EGR schedules SAE Paper, (1999) 1999-01-0835
- Kouremenos D. A. Hountalas D. T. Binder K. B. The Effect of EGR on the Performance and Pollutant Emissions of Heavy Duty Diesel Engines using Constant and Variable AFR SAE Paper, (2001) 2001-01-0198
- Pierpont D. A. Montgomery D. T. Reitz R. D. Reducing Particulate and NOx Using Multiple Injections and EGR in a D.I. Diesel SAE Paper, (1995) 950217
- Grandin Börje Angström Hans-Erik Replacing Fuel Enrichment in a Turbo Charged SI Engine: Lean Burn or Cooled EGR SAE Paper, (1999) 1999-01-3505
- Larson Christopher A. Levendis Ylannis A. On the Effectiveness and Economy of Operation of ART-EGR Systems that Reduce Diesel Emissions SAE Paper,(1998) 980537
- Christensen Magnus Johansson Bengt Supercharged Homogeneous Charge Compression Ignition (HCCI) with Exhaust Gas Recirculation and Pilot Fuel SAE Paper, (2000) 2000-01-1835
- Martinez-Frias Joel Aceves Salvador M. Flowers Daniel Smith J. Ray HCCI Engine Control by Thermal Management SAE Paper, (2000) 2000-01-2869
- Morimoto Satoshi S. Kawabata Yasuharu Sakurai Teruhiro Amano Toshiji Operating Characteristics of a Natural Gas-Fired Homogeneous Charge Compression Ignition Engine (Performance Improvement Using EGR) SAE Paper, (2001) 2001-01-1034
- Hall Matthew J. Zuzek Patrick Fiber Optic Sensor for Time-Resolved Measurements of Exhaust Gas Recirculation in Engines SAE Paper, (2000) 2000-01-2865
- Mattarelli E. Bianchi G. M. Ivaldi D. Experimental and Numerical Investigation on the EGR System of a New Automotive Diesel Engine SAE Paper, (2000) 2000-01-0224
- Müller Martin Olin Peter M. Schreurs Bart Dynamic EGR Estimation for Production Engine Control SAE Paper. (2001) 2001-01-0553
- Jie Ma Evaluation of turbocharger power assist system using optimal control techniques SAE Paper, (2000) 2000-01-0519
- Yongqiang Han Zhongchang Liu Xiaoming Liu “Effect of combustion parameters on diesel engine smoke opacity under constant speed and increasing torque transient operating condition” Journal of Combustion Science and Technology 10 1 February 2004 23 27
- Yongqiang Han Zhongchang Liu Peng Cheng “Effect of combustion parameters on diesel engine smoke opacity under constant torque and increasing speed transient operating conditions” Chinese Society for Internal Combustion Engines 21 5 September 2003 293
- Kanesaka Hiroshi Reduction of hybrid diesel engine emission by EGR (an only possible method to meet U.S. emission standard of the year 2004) SAE Paper, (1999) 1999-01-0971