Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Experimental and Numerical Assessment of the Effects of Various Coolant Temperature in Gasoline Vehicle on Fuel Consumption and Emissions

냉각수온 변화가 가솔린 차량의 연비 및 배출가스에 미치는 영향에 관한 실험 및 수치적 평가

  • Received : 2017.01.18
  • Accepted : 2017.03.13
  • Published : 2017.05.01
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Abstract

One of the major engine thermal management system(TMS) strategies for improving fuel economy is to operate the engine in high temperatures. Therefore, this work performed a numerical and experimental study to examine the effect of several different STOs(Starting Temperature of Opening) of wax-thermostat, ranging from $85^{\circ}C$ to $105^{\circ}C$, of gasoline engine on fuel economy and emission characteristics. In this study, a gasoline car equipped with waxthermostat was tested and simulated under FTP-75 and HWFET mode. CRUISE $M^{TM}$ was used to simulate vehicle dynamics, transient engine performance and TMS. The test results showed fuel savings for both drive cycles due to higher STO of $100^{\circ}C$, which is slightly worse than that of $90^{\circ}C$ and amounts between 0.34 and 0.475 %. These controversial results are attributed to experimental errors and uncertainty. The computational results for three STOs, $85^{\circ}C$, $95^{\circ}C$ and $105^{\circ}C$, showed that fuel savings attributed to the application of higher STOs of $95^{\circ}C$ and $105^{\circ}C$ are relatively small and range from 0.306 to 0.363 %. It is also found that the amount of HC and CO emissions from the tailpipe tends to decrease with higher engine coolant temperature because of faster catalyst light-off and improved combustion.

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References

  1. S. Kim, Y. Kim, H. Joung, W. Jeon, J. Jeong and S. Jeong, "Application of Graphene Platelets on Electronic Controlled Thermostat of TGDI Engine for Improving Thermal Sensitivity," Transactions of KSAE, Vol.25, No.1, pp.66-73, 2017. https://doi.org/10.7467/KSAE.2017.25.1.066
  2. W. Cho, H. Kim and K. Lee, "An Experimental Study on the Improvement of Fuel Economy according to Coolant and Oil Temperature," Transactions of KSAE, Vol.17, No.1, pp.72-79, 2009.
  3. D. Han, H. Im, S. Han and H. Kim, "The Turbocharged Theta GDI Engine of Hyundai," MTZ 2011-10, Vol.72, 2011.
  4. X. Luo, H. Teng, T. Hu, R. Miao and L. Cao, "An Experimental Investigation on Low Speed Pre-Ignition in a Highly Boosted Gasoline Direct Injection Engine," SAE 2015-01-0758, 2015.
  5. L. Teodosio, V. De Bellis and F. Bozza, "Fuel Economy Improvement and Knock Tendency Reduction of a Downsized Turbocharged Engine at Full Load Operations through a Low-Pressure EGR System," SAE 2015-01-1244, 2015.
  6. K. Khanjani, J. Deng and A. Ordys, "Controlling Variable Coolant Temperature in Internal Combustion Engines and its Effects on Fuel Consumption," SAE 2014-32-0064, 2014.
  7. K. Kim, K. Choi, K. Lee and K. Lee, "Active Coolant Control Strategies in Automotive Engines," Int. J. Automotive Technology, Vol.11, No.6, pp.767-772, 2010. https://doi.org/10.1007/s12239-010-0091-4
  8. G. Liu, Z. Zhao, H. Guan, Y. Liu, C. Zhang, D. Gao, W. Zhou and J. Knauf, "Influence of Advanced Technology for Thermal Management on SUV," SAE 2016-01-0238, 2016.
  9. T. Banjac, J. C. Wurzenberger and T. Katrasnik, "Assessment of Engine Thermal Management through Advanced System Engineering Modeling," Advances in Engineering Software, Vol.71, pp.19-33, 2014. https://doi.org/10.1016/j.advengsoft.2014.01.016
  10. D. D. Battisa and R. Cipollone, "Experimental and Numerical Assessment of Methods to Reduce Warm up Time of Engine Lubricant Oil," Appied Energy, Vol.162, pp.570-580, 2016. https://doi.org/10.1016/j.apenergy.2015.10.127
  11. S. Thomas, A. Saroop, R. Rajak and S. Muthiah, "Investigation on the Effect of Coolant Temperature on the Performance and Emissions of Naturally Aspirated Gasoline Engine," SAE 2011-26-0089, 2011.
  12. D. Kim, S. Kim, S. Lee and J. Lim, "A Study of Fuel Economy Improvement Potential on US Fuel Economy Test Cycles by Model Based Development of Cooled HP-EGR System on GDI Engine," KSAE Annual Conference Proceedings, pp.191-196, 2012.
  13. S. Kim, G. Lee, J. Jeong and S. Jeong, "The Effect of Starting Temperature of Opening of Wax-Thermostat on Fuel Consumption and Emissions of Gasoline Vehicle," KSAE Fall Conference Proceedings, pp.1192-1198, 2016.
  14. J. B. Heywood, Internal Combustion Engines Fundamentals, McGrawHill, New York, 1988.
  15. Advanced Simulation Technologies, CRUISE M- User's Manual ver. 2015.2, AVL List GmbH, Austria, 2015.
  16. K. J. Patton, R. G. Nitschke and J. B. Heywood, "Development and Evaluation of a Performance and Efficiency Model for Spark-Ignition Engines," SAE 890836, 1989.
  17. D. Sandoval and J. B. Heywood, "An Improved Friction Model for Spark-Ignition Engines," SAE 2003-01-0725, 2003.
  18. F. P. Incropera and D. P. Dewitt, Fundamentals of Heat and Mass Transfer, 5th Edn., John Wiley & Sons, New York, 2002.
  19. J. R. Wagner, M. C. Ghone, D. W. Dawson and E. E. Marotta, "Coolant Flow Control Strategies for Automotive Thermal Management Systems," SAE 2002-01-0713, 2002.

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  1. System-Level Simulation of Active Cooling Control in an Automotive Engine through the Application of Electronically-map-controlled Thermostat vol.25, pp.4, 2017, https://doi.org/10.7467/KSAE.2017.25.4.488