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Model of a Supercharged Diesel Engine with High and Low-Pressure EGR as Part of an NMPC for ECU Implementation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 16, 2007 by Consiglio Nazionale delle Ricerche in Italy
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The paper focuses on a system and an appropriate controller concept for advanced air management of a turbo-charged passenger car diesel engine. The proposed air management system consists of a VTG turbocharger and two separate Exhaust Gas Recirculation (EGR) loops, a cooled or non-cooled high-pressure EGR (HP EGR) and a cooled low-pressure EGR (LP EGR) loop. In the LP EGR loop, the exhaust gas leaving the particulate filter is mixed with fresh air just in front of the compressor inlet.
A main model (MM) was created in Simulink to design a Nonlinear Model-based Predictive Controller (NMPC). This model is mainly founded on physical equations, allowing easy adaptation to various systems. MM is a detailed model which was developed first and which is also used for software-in-the-loop (SIL) tests of the controller with the simulated engine.
At the beginning of the diesel engine test stage, stationary measurements were conducted to examine the influence of variations of the EGR rate, boost pressure, fresh air mass, etc. These tests were carried out in an open loop without an integrated controller for the air management system. The results were used to optimize the Simulink models.
As to the controller concept, a model-based predictive approach is briefly presented which uses a simplified simulation model (a reduced version of a more detailed MM) with real-time capability of the complete air path for providing the system states. For the prediction, an additional, simplified model of the engine's air path system with real-time capability is used.
In this paper the main emphasis is on the modeling and the building of the SIL-environment for developing and testing the NMPC. In addition, the controller structure and simulation and measurement results of steady and unsteady tests are presented and analyzed.
CitationGheorghiu, V., Ueberschär, D., Müller, V., and Christmann, R., "Model of a Supercharged Diesel Engine with High and Low-Pressure EGR as Part of an NMPC for ECU Implementation," SAE Technical Paper 2007-24-0084, 2007, https://doi.org/10.4271/2007-24-0084.
- Gheorghiu V. Müller V. Christmann R. Münz S. System und regelungskonzept für zukünftige Turbolader-Abgasrückführsysteme für turboaufgeladener Diesel Pkw (German) Aufladtechnische Konferenz, Dresden September 2005 *
- Gheorghiu V. Müller V. Christmann R. Münz S. System Structure and Controller Concept for an Advanced Turbocharger/EGR System for a Turbocharged Passenger Car Diesel Engine SAE 2005;-01-3888 October 2005 San Antonio, USA *
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