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Dugard, Luc
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Intra-Pipe Restriction Non-Homentropic Boundary Resolution Method

GIPSA Lab Renault SAS-Felipe Castillo
GIPSA Lab UJF Grenoble 1/CNRS-Emmanuel Witrant, Luc Dugard
Published 2013-04-08 by SAE International in United States
A complete non-homentropic boundary resolution method for a flow upstream and downstream an intra-pipe restriction is considered in this article. The method is capable of introducing more predictable quasi-steady restriction models into the boundary problem resolution without adding artificial discharge coefficients. The traditional hypothesis of isentropic contraction, typically considered for the boundary resolution, is replaced by an entropy corrected method of characteristics (MOC) in order to be consistent with a non-homentropic formulation. The boundary resolution method is designed independently of the quasi-steady restriction models which allows obtaining a greater modeling flexibility when compared with traditional methods. An experimental validation at unsteady conditions is presented using different restriction quasi-steady models to illustrate the effectiveness of the proposed boundary resolution method in terms of predictability as well as flexibility.
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Exhaust Manifold Pressure Estimation Diesel Equipped with a VGT Turbocharger

GIPSA Lab - Renault SAS-Felipe Castillo
Renault SAS-Vincent Talon
Published 2013-04-08 by SAE International in United States
This paper develops an exhaust manifold pressure estimation method for a Diesel engine equipped with a variable geometry turbine (VGT) turbocharger. Extrapolated VGT data-maps are used directly for the estimation of the exhaust pressure using a non-iterative Newton-Raphson based method suitable for real-time applications. This approach can give more accurate estimations than traditional methods because it takes into account the turbine speed effect on the turbine mass flow rate. All this without increasing the calculation load significantly. The proposed exhaust manifold estimation can be used to relieve the exhaust manifold pressure physical sensor during engine operating conditions where its reliability is low. The estimator is evaluated in transient with two different engine cycles using a engine model validated in a benchmark as a reference.
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Restriction Model Independent Method for Non-Isentropic Outflow Valve Boundary Problem Resolution

Gipsa Lab-Emmanuel Witrant, Luc Dugard
RENAULT SAS-Felipe Castillo
Published 2012-04-16 by SAE International in United States
To meet the new engine regulations, increasingly sophisticated engine alternative combustion modes have been developed in order to achieve simultaneously the emission regulations and the required engine drivability. However, these new approaches require more complex, reliable and precise control systems and technologies. The 0-D model based control systems have proved to be successful in many applications, but as the complexity of the engines increases, their limitations start to affect the engine control performance. One of the 0-D modeling limitations is their inability to model mass transport time. 1-D modeling allows some of the 0-D models limitations to be overcome, which is the motivation of this work. In this paper, two quasi-steady outflow boundary models are developed: one is based on the isentropic contraction and the other on a momentum conservation approach. Both are compared with computational fluid dynamics (CFD) 3-D simulations. Then, an innovative method for solving the outflow boundary problem taking into account the entropy correction at the boundary for a 1-D unsteady gas flow modeling is presented. Its formulation allows more predictive quasi-steady…
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Semi-Active Suspension Control Design for Vehicles

Oliver Sename, Luc Dugard, Cristiano Spelta, Charles Poussot-Vassal
Politecnico di Milano-Sergio Matteo Savaresi
  • Book
  • B-888
Published 2010-08-01 by Elsevier in United Kingdom

Semi-active suspension systems promise weight efficiencies, cost savings, and higher safety and comfort compared to other types of electronically-controlled suspensions currently in use. With the growing emphasis on fuel economy, reduced CO2 emissions, and cost reductions for all vehicles, these semi-active systems are set to become a growing part of overall vehicle design, but coverage of them in standard automotive engineering texts is currently limited.