Compression ignition engine model supporting powertrain development

Abstract

To meet the future Euro VI pollutant standard, compression ignition engines have to be improved while maintaining the fuel consumption advantage they have versus spark ignition engines. Since technological breakthrough are not expected, the future CI engines will include more components (EGR systems, Turbocharger, DOC, Particulate filter, SCR,…) to reach as well low pollutants emissions and low fuel consumption. The single elements composing an engine might be well known today, but the optimization of the whole system represents the key point for further developments. The engine control unit must therefore include advanced control laws in order to optimize the system's response and to take advantage of the system's complexity. Thanks to the good compromise it offers between computational time and accuracy, 0D simulation offers a very interesting tool for engine system definition, calibration control development. This paper describes how a 0D engine model can improve the engine control law design for a turbocharged Diesel engine fitted with HP and LP EGR systems.