Model-based calibration: A case study for calibrating control systems of downsized boosted engines

Summary form only given. This presentation is one of the series from the industry point of view in the Tutorial Session “Model-Based Powertrain and Aftertreatment System Control Design and Implementation”. It discusses the role of the model-based calibration in the design of powertrain control systems through a case study. As emission requirements become much stringent, and the CAFÉ or equivalent CO2 regulations set forth the new fuel economy standards, powertrain solutions for vehicle propulsion systems become more sophisticated. The advancement of new technologies into product applications has been utilizing engine downsizing with advanced turbochargers, high pressure direct injection, advanced exhaust aftertreatment technology and electrifications. As a result, the effort to design and calibrate such a powertrain control system faces multiple challenges that have to deal with varying hardware components, couplings among multi-variable systems, fuel economy and emission trade-off and robust performances at wide range operating conditions. This case study shows how we could use engine models through system optimization to calibrate a multivariable boost pressure and EGR control system for a turbocharged diesel engines. The model-based calibration will not only save test cell calibration time, but also improve system performances in terms of robustness and fuel economy.