Nodal modelling for advanced thermal-management of internal combustion engine

The evolution of temperatures in internal combustion engines during cold start is quite important. This greatly affects fuel consumption and vehicle emissions. In this paper, an advanced thermal management model is presented and used on an automotive Diesel engine in order to determine the evolution of the different temperatures during warm-up stage. The paper focuses on the complete description of the engine components, coolant circuit, and lubricant circuit. The objective is to calculate the heat exchanges between the thermal masses of sub-models (cylinder head, engine block, pistons, oil sump…) and the fluids. Experiments on an engine were realized in order to calibrate the model (heat release, friction losses…) but also to obtain the temperature evolutions during transient stage. These last results were used in order to validate the model. This approach gives the possibility to determine the coolant and oil temperature evolution with a minimum of nodes and a relatively short calculation time. The evolution of the coolant temperature in a vehicle during a NEDC cycle with a cold start was studied. A good agreement was obtained. Finally, the model was used in order to study the possibilities to reduce the vehicle mass by a reduction of the engine mass.

[1]  John B. Heywood,et al.  An Improved Friction Model for Spark-Ignition Engines , 2003 .

[2]  Martin Weiss,et al.  CO2 labelling of passenger cars in Europe: status, challenges, and future prospects , 2016 .

[3]  P. Shayler,et al.  A Model for the Investigation of Temperature, Heat Flow and Friction Characteristics During Engine Warm-Up , 1993 .

[4]  Jean-Paul Zammit,et al.  Managing engine thermal state to reduce friction losses during warm-up , 2013 .

[5]  Cédric Garnier.  Contribution à l'optimisation de la puissance thermique disponible en régime transitoire pour le confort dans une automobile , 2007 .

[6]  Margaret O'Mahony,et al.  Development of a driving cycle to evaluate the energy economy of electric vehicles in urban areas , 2016 .

[8]  Sotirios Mamalis.  Simulation and Thermodynamic Analysis of High Pressure Lean Burn Engines. , 2012 .

[9]  Giorgio Martini,et al.  Low-temperature cold-start gaseous emissions of late technology passenger cars , 2013 .

[10]  Alfredo Gimelli,et al.  Study of a new mechanical variable valve actuation system: Part I—valve train design and friction modeling , 2015 .

[11]  Andrew Lewis,et al.  Systems Approach to the Improvement of Engine Warm-Up Behaviour , 2011 .

[12]  John B. Heywood,et al.  Development and Evaluation of a Friction Model for Spark-Ignition Engines , 1989 .

[13]  C J Brace,et al.  Cooling system improvements — assessing the effects on emissions and fuel economy , 2008 .

[14]  M. RahmanM.,et al.  An Integrated Model for Predicting Engine Friction Losses in Internal Combustion Engines , 2014 .

[15]  Fabio Bozza,et al.  Strategies for Improving Fuel Consumption at Part-Load in a Downsized Turbocharged SI Engine: a Comparative Study , 2014 .

[16]  Kyoungdoug Min,et al.  Analysis of engine temperature and energy flow in diesel engine using engine thermal management , 2013 .

[17]  Siew Hwa Chan,et al.  Performance and emissions characteristics of a partially insulated gasoline engine , 2001 .

[18]  Stefan Pischinger,et al.  Engine friction reduction , 2005 .

[19]  Roberto Cipollone,et al.  Effects of Oil Warm up Acceleration on the Fuel Consumption of Reciprocating Internal Combustion Engines , 2015 .

[20]  Alfredo Gimelli,et al.  Study of a new mechanical variable valve actuation system: Part II—estimation of the actual fuel consumption improvement through one-dimensional fluid dynamic analysis and valve train friction estimation , 2015 .

[21]  Sam Akehurst,et al.  Systems optimisation of an active thermal management system during engine warm-up , 2012 .

[22]  B. Degraeuwe,et al.  A concise wall temperature model for DI Diesel engines , 2006 .