Einladung zum Vortrag im Kolloquium Technische Kybernetik

Individual Cylinder Observers on Diesel Engines

Dr. Nicolas Petit

Centre Automatique et Systèmes
Ecole Nationale Supérieure des Mines de Paris
Paris, France

    Zeit: Dienstag · 12. 7. 2005 · 16:00 Uhr
    Ort: Raum V 9.31 · Pfaffenwaldring 9 · Campus Stuttgart-Vaihingen

Abstract

Performance and environmental requirements impose advanced control strategies for automotive applications. In this context, controlling the combustion represents a key challenge. Among several important topics (briefly discussed in this talk), one important step is the control of the Air Fuel Ratio (AFR) which is a good representation of the torque produced by Diesel engine. Due to flaws of the injection system, the total mass of fuel injected in each cylinder is very difficult to predict. For forthcoming HCCI engines, such unbalance between the cylinders can have dramatic consequences and induce important noise, possible stall and higher emissions.

In this talk, we present the design and experimental validation of two real-time observers for the individual cylinder AFR using the reliable and available sensor placed downstream the turbine as only measurement. We propose a high frequency approach (6 degree crankshaft angle modelling and update instead of the classical 180) and use a physics-based model underlying the role of periodic input flows. Convergence is proven and the observers are experimentally tested on a four cylinder turbocharged diesel test bench operated at Institut Francais du Petrole (IFP).

Biographical Information

Nicolas Petit was born in 1972 in Paris, France. He graduated from Ecole Polytechnique in 1995, and obtained his PhD in Mathematics and Control at Ecole des Mines de Paris in 2000. In 2000-2001, he was a Postdoctoral Scholar in the Control and Dynamical Systems at the California Institute of Technology. Since 2001, he has held the position of Maitre-Assistant at the Ecole des Mines de Paris in the Centre Automatique et Systemes.

Dr. Petit's research interests include flatness theory for partial differential equations, and numerical treatment of optimal trajectory generation problems for nonlinear systems. On the application side, he is active in industrial process control, engine control, as well as designing and building a fleet of mini UAVs. He has developed the controllers of several industrial chemical reactors, including polystyrene and polypropylene reactors, and the ANAMEL V4 software, currently used for closed loop control of blending devices in numerous refineries.