This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Combined Technologies for Efficiency Improvement on a 1.0 L Turbocharged GDI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The CO2 reduction request for automotive industry promotes the efforts on the engine thermal efficiency improvement. The goal of this research is to improve the thermal efficiency on an extremely downsized 3-cylinder 1.0 L turbocharged gasoline direct injection engine. Effects of compression ratio, exhaust gas recirculation (EGR), valve timing and viscosity of oil on fuel economy were studied. The results show that increasing compression ratio, from 9.6 to 12, can improve fuel economy at relative low load (below 12 bar BMEP), but has a negative effect at high load due to increased knock intensity. EGR can significantly reduce the pumping loss at low load, optimize combustion phase and reduce exhaust gas temperature. Therefore, the fuel consumption is reduced at all test points. The average brake thermal efficiency (BTE) benefit percentage is 3.47% with 9.6 compression ratio and 5.33 % with 12 compression ratio. However, at higher load (over 18 bar BMEP), EGR needs to be reduced to reach the target load, which would affect its benefit to efficiency.
Combined high compression ratio with EGR, the maximum BTE increased from 36.55% to 38.95% at 2500 rpm 14 bar BMEP, in which compression ratio and EGR contribute an absolute increase of BTE by 0.36% and 2.04% separately. Based on that, valve timing was optimized, and lower viscosity oil was used. The maximum BTE was further enhanced to 39.53%, in which optimization of valve timing and lower viscosity oil contribute an absolute increase of BTE by 0.24% and 0.34% separately.
Besides, engine performance at full load was investigated. The results show that there is power loss at full load after increasing compression ratio. EGR is not applicable to recover the torque with high compression ratio, in contrast, it would increase combustion instability and decrease the torque. Fuel enrichment and reducing coolant temperature are two effective ways to recover the torque but sacrificing engine efficiency.
- Li Guan - Ningbo Geely Royal Engine Components Co.
- Chen Yang - Ningbo Geely Royal Engine Components Co.
- Yuan Shen - Ningbo Geely Royal Engine Components Co.
- Denghao Zhu - Tongji University
- Yuedong Chao - Tongji University
- Jun Deng - Tongji University
- Zongjie Hu - Tongji University
- Liguang Li - Tongji University
CitationZhu, D., Chao, Y., Deng, J., Hu, Z. et al., "Combined Technologies for Efficiency Improvement on a 1.0 L Turbocharged GDI Engine," SAE Technical Paper 2019-01-0233, 2019, https://doi.org/10.4271/2019-01-0233.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
- China Automotive Engineering Society Technology Roadmap for Energy Saving and New Energy Vehicles [M] Beijing Mechanical Industry Press 2016 28 29
- Yang , C. , Cheng , H. , fan , Z. , Yin , J. et al. Development of a 1-Liter Advanced Turbocharged Gasoline Direct Injection 3-Cylinder Engine SAE Technical Paper 2017-01-0632 2017 10.4271/2017-01-0632
- Heywood , J.B. Internal Combustion Engine Fundamentals [M] McGraw-Hill 268 270 1988
- Muñoz , R. , Han , Z. , VanDerWege , B. , and Yi , J. Effect of Compression Ratio on Stratified-Charge Direct-Injection Gasoline Combustion SAE Technical Paper 2005-01-0100 2005 10.4271/2005-01-0100
- Smith , P. , Heywood , J. , and Cheng , W. Effects of Compression Ratio on Spark-Ignited Engine Efficiency SAE Technical Paper 2014-01-2599 2014 10.4271/2014-01-2599
- Maiboom , A. , Tauzia , X. , Shah , S. , and Hétet , J. Experimental Study of an LP EGR System on an Automotive Diesel Engine, Compared to HP EGR with Respect to PM and NOx Emissions and Specific Fuel Consumption SAE Int. J. Engines 2 2 597 610 2010 10.4271/2009-24-0138
- Kim , Y. , Park , C. , Kim , J. , and Min , B. The Effect of Low Temperature EGR and Low Compression Ratio on NOx Reduction for EU6 Diesel Engine SAE Technical Paper 2013-01-2644 2013 10.4271/2013-01-2644
- Roth , D. , Keller , P. , and Becker , M. Requirements of External EGR Systems for Dual Cam Phaser Turbo GDI Engines SAE Technical Paper 2010-01-0588 2010 10.4271/2010-01-0588
- Takaki , D. , Tsuchida , H. , Kobara , T. , Akagi , M. et al. Study of an EGR System for Downsizing Turbocharged Gasoline Engine to Improve Fuel Economy SAE Technical Paper 2014-01-1199 2014 10.4271/2014-01-1199
- Liu , Z. and Cleary , D. Fuel Consumption Evaluation of Cooled External EGR for a Downsized Boosted SIDI DICP Engine SAE Technical Paper 2014-01-1235 2014 10.4271/2014-01-1235
- Su , J. , Xu , M. , Li , T. et al. Combined Effects of Cooled EGR and a Higher Geometric Compression Ratio on Thermal Efficiency Improvement of a Downsized Boosted Spark-Ignition Direct-Injection Engine [J] Energy Conversion and Management 78 65 73 2014
- Lu , H. , Deng , J. , Hu , Z. , Wu , Z. et al. Study on Fuel Economy Improvement by Low Pressure Water-Cooled EGR System on a Downsized Boosted Gasoline Engine SAE Technical Paper 2016-01-0678 2016 10.4271/2016-01-0678
- Teodosio , L. , De Bellis , V. , and Bozza , F. Combined Effects of Valve Strategies, Compression Ratio, Water Injection and Cooled EGR on the Fuel Consumption of a Small Turbocharged VVA Spark-Ignition Engine SAE Technical Paper 2018-01-0854 2018 10.4271/2018-01-0854
- Conway , G. , Robertson , D. , Chadwell , C. , McDonald , J. et al. Evaluation of Emerging Technologies on a 1.6 L Turbocharged GDI Engine SAE Technical Paper 2018-01-1423 2018 10.4271/2018-01-1423
- Van Basshuysen R and Schäfer F Handbuch Verbrennungsmotor [J] 2002
- Allmaier , H. , Knauder , C. , Salhofer , S. et al. An Experimental Study of the Load and Heat Influence from Combustion on Engine Friction [J] International Journal of Engine Research 17 3 347 353 2016
- Wong , V.W. and Tung , S.C. Overview of Automotive Engine Friction and Reduction Trends-Effects of Surface, Material, and Lubricant-Additive Technologies [J] Friction 4 1 1 28 2016
- Tanaka , H. , Nagashima , T. , Sato , T. , and Kawauchi , S. The Effect of 0W-20 Low Viscosity Engine Oil on Fuel Economy SAE Technical Paper 1999-01-3468 1999 10.4271/1999-01-3468
- Tamoto , Y. , Kido , M. , and Murata , H. Possibilities of Ultra Low Viscosity Fuel Saving Gasoline Engine Oil SAE Technical Paper 2004-01-1936 2004 10.4271/2004-01-1936
- Manni , M. and Florio , S. An Experimental Evaluation of the Impact of Ultra Low Viscosity Engine Oils on Fuel Economy and CO2 Emissions SAE Technical Paper 2013-01-2566 2013 10.4271/2013-01-2566
- Gamma Technologies Inc GT-POWER, User’s Manual and Tutorial. GT-Suite TM Version 7.4 USA 2013
- Woschni , G. A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine SAE Technical Paper 670931 1967 10.4271/670931