ASSESSMENT OF THE INFLUENCE OF DIFFERENT COOLING SYSTEM CONFIGURATIONS ON ENGINE WARM-UP, EMISSIONS AND FUEL CONSUMPTION

다국어 초록 (Multilingual Abstract)

One of the major goals of engine designers is the reduction of fuel consumption and pollutant emissions while keeping or even improving engine performance. In recent years, different technical issues have been investigated and incorporated into internal combustion engines in order to fulfill these requirements. Most are related to the combustion process since it is responsible for both fuel consumption and pollutant emissions. Additionally, the most critical operating points for an engine are both the starting and the warming up periods (the time the engine takes to reach its nominal temperature, generally between 80ºC and 90ºC), since at these points fuel consumption and pollutant emissions are larger than at any other points. Thus, reducing the warm-up period can be crucial to fulfill new demands and regulations. This period depends strongly on the engine cooling system and the different strategies used to control and regulate coolant flow and temperature. In the present work, the influences of different engine cooling system configurations on the warm-up period of a Diesel engine are studied. The first part of the work focuses on the modeling of a baseline engine cooling system and the tests performed to adjust and validate the model. Once the model was validated, different modifications of the engine coolant system were simulated. From the modelled results, the most favourable condition was selected in order to check on the test bench the reduction achieved in engine warm-up time and to quantify the benefits obtained in terms of engine fuel consumption and pollutant emissions under the New European Driving Cycle (NEDC). The results show that one of the selected configurations reduced the warm-up period by approximately 159 s when compared with the baseline configuration. As a consequence, important reductions in fuel consumption and pollutant emissions (HC and CO) were obtained.

참고문헌 (Reference)

• 1 Porot,P.A., "Understanding and improving evaporative engine cooling at high load,high speed by engine tests and 3D calculations.SAE Paper No"
• 2 Allen,D.J., "Thermal management evolution and controlled coolant flow.SAE Paper No"
• 3 Chanfreau,M., "The need for an electrical water valve in a thermal management intelligent system THEMISTM.SAE Paper No"
• 4 Payri,F., "Study of the potential of intake air heating in automotive DI diesel engines.SAE Paper No"
• 5 J. K. PARK, "SIMULATION OF STARTING PROCESS OF DIESEL ENGINE UNDER" 한국자동차공학회 8 (8): 289-298, 2007
• 6 Pang,H.H., "Review of engine cooling technologies for modern engines.P.I.Mech.Eng.D-J.Aut.,11" 11 : 1209-1215, 2004
• 7 Alkidas,A.C., "Relationships between smoke measurements and particulate measurements.SAE Paper No"
• 8 Arcoumanis,C., "Real-time measurement of particulate emissions in turbocharged DI diesel engine.SAE Paper No"
• 9 Arregle,J., "Procedure for engine transient cycle emissions testing in real time.Exp.Therm.Fluid Sci" 30 : 485-496, 2006
• 10 Kaplan,J.A., "Modelling the spark ignition engine warm-up process to predict component temperatures and hydrocarbon emissions.SAE Paper No"
• 11 Alberto Broatch, "Measurement of Hydrocarbon and Carbon Monoxide Emissions during the Starting of Automotive DI Diesel Engines" 한국자동차공학회 9 (9): 129-140, 2008
• 12 Messer,J.T., "Measurement delays and modal analysis for a transportable heavy duty emissions testing laboratory.SAE Paper No"
• 13 Strupp,N., "MAC simulation using modelica/dymola.7th IIR Gustav Lorentzen Conf"
• 14 Jaichandar,S., "Low heat rejection engines – An overview.SAE Paper No"
• 15 Chalgren,R.D.Jr., "Light duty diesel advanced thermal management.SAE Paper No"
• 16 Payri,F., "Influence of measurement errors and estimated parameters on combustion diagnosis.Appl.Therm.Eng" 26 : 226-236, 2006
• 17 Campbell,N.A.F., "Incorporating nucleate boiling in a precision cooling strategy for combustion engines.SAE Paper No"
• 18 Jones,B.L., "In-service smoke and particulate measurements.SAE Paper No"
• 19 Torregrosa,A.J.,.,.and, "Experiments on the influence of inlet charge and coolant temperature on performance and emissions of a DI diesel engine.Exp.Therm.Fluid Sci" 30 : 633-641, 2006
• 20 Cortona,E., "Engine thermomanagement with electrical components for fuel consumption reduction.Int.J.Engine Res" 3 : 157-170, 2000
• 21 Cortona,E., "Engine termal management with electronic cooling pump.SAE Paper No"
• 22 Cheung,S.K., "Diesel particulate measurements with a light scattering(dispersa)photometer.SAE Paper No"
• 23 Lehner,C., "Design and development of a model based feedback controlled cooling system for heavy duty diesel truck applications using a vehicle engine cooling system simulation.SAE Paper No"
• 24 Robinson,K., "Convective coolant heat transfer in internal combustion engines.P.I.Mech.Eng.D-J.Aut" 217 : 133-146, 2003
• 25 Cho,H., "Control strategy of electric coolant pumps for fuel economy improvement.Int.J" 6 (6): 269-275, 2005
• 26 Kays,W.M., "Compact Heat Exchangers.3rd Edn"
• 27 Woschni,G, "A universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine.SAE Paper No"
• 28 Campbell,N.A.F., "A review of predictive analysis applied to IC engine coolant heat transfer.J.Inst" 73 : 78-86, 2000
• 29 Robinson,K., "A review of precision engine cooling.SAE Paper No"
• 30 Bohac,S.V., "A global model for steady state and transient S.I.engine heat transfer studies.SAE Paper No"
• 31 Torregrosa, A. J., "A concise wall temperature model for DI diesel engines" 26 : 1320-1327, 2006