Two state dual loop EGR engine model

Abstract

The future of Diesel engines depends on sustainable fuels and the control of harmful emission formation. Up-to-date Diesel engines have complex combustion processes and air-path systems. The latter usually contains a dual loop exhaust gas recirculation system, which exhaust brakes can support. Utilizing the controlling opportunities makes it necessary to develop models for the system. This paper presents a two-state control oriented model. Its inputs are the exhaust gas recirculation valves and the exhaust brake flap positions. Other inputs can be handled as disturbances. These are the engine speed, engine torque, and fuel consumption. The developed model relies on a previously published dual loop exhaust gas recirculation mass flow rate estimator. This estimator needs another input, an intake fresh air mass flow rate or the intake manifold pressure. An important aim was to use only onboard measured parameters. The paper presents the model's equations, the calibration, and the validation, done by the slightly modified interval of the World Harmonized Transient Cycle. At the end of the day, a reproducible model is presented, which, despite the complexity of internal combustion engines, provides a simplified solution for controlling aims.