NDLI: Airpath control of a SI engine with Variable Valve Timing actuators

Content Provider	IEEE Xplore Digital Library
Author	Leroy, T. Chauvin, J. Petit, N.
Copyright Year	2008
Description	Author affiliation: Centre Autom. et Syst., Ecole des Mines de Paris, Paris (Leroy, T.)
Abstract	We address the control of the airpath of a turbocharged SI engine equipped with variable valve timing (VVT) actuators. VVT devices are used to produce internal exhaust gas recirculation, providing beneficial effects in terms of consumption and pollutant emissions reduction. However, VVT actuators affect the fresh air charge in the cylinders. This has an impact on the torque output (leading to driveability problems), and on the air/fuel ratio (AFR) (leading to pollution peaks). To compensate these undesirable effects, a new approach is proposed. We model the intake dynamics as a first order system using a balance equation in which the VVT actuators play the role of a measured disturbance in the volumetric efficiency of the aspiration phenomenon. In view of practical implementation, two types of modeling errors are considered. We address them by an integral term and an observer. Convergence is proven. This strategy is sufficient to control the engine air mass. As a consequence, the AFR management is improved. These points are supported by experimental results.
Starting Page	2076
Ending Page	2083
File Size	538246
Page Count	8
File Format	PDF
ISBN	9781424420780
ISSN	07431619
DOI	10.1109/ACC.2008.4586799
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Valves Timing Actuators Engine cylinders Torque Fuels Air pollution Integral equations Volume measurement Pollution measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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