A mixed mean-value and crank-based model of a dual-stage turbocharged SI engine for Hardware-In-the-Loop simulation

Closed loop combustion control of internal combustion engines becomes a necessity to meet today´s fuel economy and emission requirements. Hardware-In-the-Loop (HIL) simulation of engine systems plays an important role in developing and validating real-time engine control systems. Traditionally the engine models used for the HIL simulation are so-called mean value ones that simulate average engine operational behaviors, while the development and validation of closed loop combustion control require crank-based (or event based) feedback signals, such as in-cylinder pressure signals, in an HIL simulator. In this paper, a mixed mean valve and crank-based engine model was developed for a dual-stage turbocharged engine. This engine model contains both cycle-to-cycle combustion information and averaged engine dynamics such as air flow, speed, torque, etc. GT-Power engine model was developed to obtain calibrations for the Simulink real-time engine model built for the real-time HIL simulator.