Title: Study of the nonlinear control techniques for single acting VGT pneumatic actuator

Authors: S. Laghrouche; A. Mehmood; M. El Bagdouri

Addresses: Laboratoire S.E.T, Université de Technologie de Belfort-Montbéliard, Belfort, France ' Laboratoire S.E.T, Université de Technologie de Belfort-Montbéliard, Belfort, France ' Laboratoire S.E.T, Université de Technologie de Belfort-Montbéliard, Belfort, France

Abstract: In this paper, we have developed a detailed mathematical model of a pneumatic actuator for a Variable Geometry Turbocharger (VGT) equipped with an Electro-pneumatic Pressure Converter (EPC). This model may require complex calculations for control purpose; therefore the dynamics of the EPC have been neglected and replaced by a static gain. These models incorporate friction and aerodynamic force related effects by using adaptive LuGre model. To compensate for parametric uncertainties, two single-input single-output nonlinear position control laws are designed using the second order sliding mode (SMC) and backstepping control. A comparative study with experiments shows the effectiveness of the proposed controllers.

Keywords: mathematical modelling; adaptive LuGre model; sliding mode control; SMC; twisting algorithm; backstepping control; nonlinear control; VGT pneumatic actuators; variable geometry turbocharger; electropneumatic pressure converter; EPC; friction; aerodynamics; parametric uncertainties; position control; vehicle design.

DOI: 10.1504/IJVD.2012.050084

International Journal of Vehicle Design, 2012 Vol.60 No.3/4, pp.264 - 285

Received: 01 Apr 2011
Accepted: 18 Aug 2011

Published online: 29 Oct 2012 *

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