Virtual Performance and Emissions Mapping for Diesel Engine Design Optimization

This paper builds upon recent publication (SAE Technical Paper 2011-01-1388, 2011, doi:10.4271/2011-01-1388) and outlines the on-going development of an advanced simulator for virtual engine mapping and optimization of engine performance, combustion and emissions characteristics. The model is further advanced through development of new sub-models for turbulent mixing, multiple injection events, variable injection pressures, engine breathing and gas exchange, as well as particulates formation and oxidation. The result is a simulator which offers engine design and performance data typically associated with 1D thermodynamic engine cycle simulations but with the “physics-based” model robustness usually associated with 3D CFD methods. This combination then enables efficient optimization of engine design with respect to engine performance, combustion characteristics and exhaust gas emissions. As a demonstration, a detailed method to parameterize (calibrate) the advanced PDF-based model is presented followed by application to three case studies: 1) a concept study of a heavy duty diesel engine, examining the impact of increased injection pressure and lower compression ratio to meet engine design constraints and Stage IV/Tier 4 exhaust gas emission limits for both NOx and PM, 2) examining the performance of both the proposed model and 3D-CFD to simulate heat release and exhaust gas emissions in a HSDI diesel engine, 3) performance of the model over a full loadspeed map in terms of combustion and NOx emissions. The results demonstrate the robustness of the model compared to experimental observations and equivalent performance compared to more human resource and CPU cost intensive 3D-CFD simulations.

[1]  Amit Bhave,et al.  Simulating PM Emissions and Combustion Stability in Gasoline/Diesel Fuelled Engines , 2011 .

[2]  Gian Marco Bianchi,et al.  On Non-Equilibrium Turbulence Corrections in Multidimensional HSDI Diesel Engine Computations , 2001 .

[3]  Amit Bhave,et al.  Moving Toward Establishing More Robust and Systematic Model Development for IC Engines Using Process Informatics , 2010 .

[4]  Olawole Abiola Kuti,et al.  Experimental and analytical study on biodiesel and diesel spray characteristics under ultra-high injection pressure , 2010 .

[5]  Fabian Mauss,et al.  Simulating a Homogeneous Charge Compression Ignition engine fuelled with a DEE/EtOH blend , 2006 .

[6]  Sebastian Mosbach,et al.  Identifying optimal operating points in terms of engineering constraints and regulated emissions in modern diesel engines , 2011 .

[7]  Sebastian Mosbach,et al.  Iterative improvement of Bayesian parameter estimates for an engine model by means of experimental design , 2012 .

[8]  Fabian Mauss,et al.  Investigation of combustion emissions in a homogeneous charge compression injection engine: Measurements and a new computational model , 2000 .

[9]  Amit Bhave,et al.  Mapping surrogate gasoline compositions into RON/MON space , 2010 .

[10]  Sebastian Mosbach,et al.  A Detailed Chemistry Multi-cycle Simulation of a Gasoline Fueled HCCI Engine Operated with NVO , 2009 .

[11]  Sebastian Mosbach,et al.  Studying the Influence of Direct Injection on PCCI Combustion and Emissions at Engine Idle Condition Using Two Dimensional CFD and Stochastic Reactor Model , 2008 .

[12]  R van Basshuysen,et al.  Internal combustion engine handbook - basics, components, systems and perspectives , 2004 .

[13]  Fabian Mauss,et al.  Dual injection homogeneous charge compression ignition engine simulation using a stochastic reactor model , 2007 .

[14]  Fabian Mauss,et al.  Analysis of a natural gas fuelled homogeneous charge compression ignition engine with exhaust gas recirculation using a stochastic reactor model , 2004 .

[15]  Fabian Mauss,et al.  A computational study of an HCCI engine with direct injection during gas exchange , 2006 .

[16]  Sebastian Mosbach,et al.  Automated IC Engine Model Development with Uncertainty Propagation , 2011 .

[17]  Sebastian Mosbach,et al.  Optimisation of Injection Strategy, Combustion Characteristics and Emissions for IC Engines Using Advanced Simulation Technologies , 2011 .

[18]  Gordon P. Blair,et al.  Design and Simulation of Four-Stroke Engines , 1999 .

[19]  Sebastian Mosbach,et al.  Implementing detailed chemistry and in-cylinder stratification into 0/1-D IC engine cycle simulation tools , 2011 .

[20]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[21]  Rolf D. Reitz,et al.  Mechanism of Soot and NOx Emission Reduction Using Multiple-injection in a Diesel Engine , 1996 .

[22]  Sebastian Mosbach,et al.  HCCI Combustion Phasing Transient Control by Hydrogen-Rich Gas: Investigation Using a Fast Detailed-Chemistry Full-Cycle Model , 2009 .

[23]  Sebastian Mosbach,et al.  Towards a Detailed Soot Model for Internal Combustion Engines , 2009 .