Modeling and Control of Co-Surge in Bi-Turbo Engines
2011 (English)In: Proceedings of the 18th IFAC World Congress, 2011 / [ed] Bittanti, Sergio, Cenedese, Angelo, Zampieri, Sandro, International Federation of Automatic Control (IFAC) , 2011, 13010-13015 p.Conference paper (Refereed)
Using a bi-turbocharged configuration makes for better utilization of the exhaust energy and a faster torque response in V-type engines. A special surge phenomenon that should be avoided in bi-turbocharged engines is co-surge, which is when the two interconnected compressors alternately go into flow reversals. If co-surge should occur, the control system must be able to quell the oscillations with as little disturbance in torque as possible. This paper presents a model of a bi-turbocharged engine based on a Mean Value Engine Model that includes a More-Greizer compressor model for surge. The model is validated against measured data showing that it captures the frequency and amplitude of the co-surge oscillation. The effect of momentum conservation in the pipes is investigated by adding this feature to the control volumes before and after the compressor. This gives a slightly better mass flow shape with the drawback of increased simulation time, due to more states and a higher frequency content in the model. A sensitivity analysis is performed to investigate which model parameters have most influence on the co-surge behavior. It is shown that the largest influence comes from the turbocharger inertia, the volumes after the compressor and the ``zero mass flow pressure ratio'' during flow reversal in the compressor. The model is used to investigate principles for control strategies to detect and quell co-surge. The detection algorithm is evaluated on measured data.
Place, publisher, year, edition, pages
International Federation of Automatic Control (IFAC) , 2011. 13010-13015 p.
Modeling, supervision, control and diagnosis of automotive systems, Automotive system identification and modelling
IdentifiersURN: urn:nbn:se:liu:diva-90922DOI: 10.3182/20110828-6-IT-1002.02338ISBN: 978-3-902661-93-7OAI: oai:DiVA.org:liu-90922DiVA: diva2:615224
2011 IFAC World Congress, Milano, Milano, Italy, 28 August - 2 September