Luc Dugard - IEEE Xplore Author Profile

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In this paper, we focus on the French Macro-economic model. We use real economic data, available as time series, starting from 1980s and openly provided by the INSEE. Variables such as Gross Domestic Production, Exportation, Importation, Household Consumption, Gross Fixed Capital Formation and Public expenditure are included in the analysis. Our objective is to maintain a constant economic growth ...Show More
Adaptive feedforward broadband noise compensation is currently used when a correlated measurement with the disturbance (an image of the disturbance) is available. Most of the active feedforward noise control systems feature an internal “positive” acoustical feedback between the compensation system and the disturbance measurement, which has to be taken into account. Adaptive algorithms for active f...Show More
A crucial problem in adaptive feedforward noise attenuation is the presence of an "internal" positive acoustical feedback between the compensation system and the reference source which is a cause of instabilities. Adaptive algorithms for feedforward active compensation having an infinite impulse response (IIR) or a finite impulse response (FIR) structure have been developed from a stability point ...Show More
This letter presents an extension of the synthesis of a unified H∞ observer for a specific class of nonlinear systems. The objectives are to decouple the effects of bounded unknown input disturbances and to minimize the effects of measurement noises on the estimation errors of the state variables by using H∞criterion, while the nonlinearity is bounded through a Lipschitz condition. This new method...Show More
In this brief, the attenuation of sound propagation in an air-handling duct using robust and adaptive feedback active noise control (ANC) strategies is investigated. The case of multiple narrow-band disturbances located in distinct frequency regions and the interference occurring in the presence of disturbances with very close frequencies are considered. The active control uses a loudspeaker as a ...Show More
In this paper, a semi-active suspension Model Predictive Control (MPC) is designed for a full vehicle system equipped with 4 semi-active dampers. The main challenge in the semi-active suspension control problem is to tackle with the dissipativity constraints of the semi-active dampers. The constraints are here recasted as input and state constraints. The controller is designed in the MPC framework...Show More
Since there is a coupling between lateral and vertical dynamics, the interactions between control components must be taken into consideration. The paper presents the effects of vertical load variations on the controlled invariant set of the steering system. In the model the nonlinear characteristics of the tire force are approximated by the polynomial form. The analysis is based on Sum-of-Squares ...Show More
Based on a Global Chassis Control system with three-layers architecture (decision, control, and physical layers) a Fuzzy Logic (FL) approach is exploited. The FL based decision layer identifies the current driving condition of the vehicle and decides the control strategy to take care of this driving condition. A confusion matrix validates the classification results. The control strategy is impleme...Show More
In this paper, the actuator fault estimation problem of semi-active suspension systems is considered. For instance, an oil leakage in a damper could cause a reduction of the damping force. The fault estimation requires a modeling of the damper fault (both multiplicative and additive fault models can be used). Three observer-based approaches are compared for fault estimation: an observer using fast...Show More
An adaptive regulation scheme using the Internal Model Principle and an IIR Youla-Kučera controller parametrization is proposed for the suppression of multiple unknown and time varying narrow band disturbances. This development has been motivated on one hand by the need of simplifying the design of the central controller for direct adaptive regulation schemes using the Internal Model Principle and...Show More
This paper proposes a new multivariable linear parameter varying (LPV)/H∞ control strategy for global chassis control. The main objective is to handle critical driving situations by activating several subsystems (semi-active suspensions, active steering, and electromechanical braking actuators) in a hierarchical way. The main idea is to schedule the three control actions (braking, steering and sus...Show More
The semi-active suspension control problem faces the challenge of the dissipativity constraints of the semi-active dampers. This induces some compromises (actuator saturation, comfort, road holding...) which need to be taken into account in the control design step. In this paper, a state feedback input constrained control problem for LPV systems is considered with H∞ performance objective. Stabili...Show More
Semi-Active suspension systems aim to improve the stability and comfort of vehicles. Although, they offer better performance than passive suspensions, the actuators such as magneto-rheological dampers are more susceptible to failure. Oil leakage is the most common fault, and its effect is a reduction of the damping force. The estimation of suspension faults can be used with a Fault Tolerant Contro...Show More
In this paper, we present a motion-scheduled LPV/H∞ suspension controller that takes into account the three main motions of the vehicle vertical dynamics: bounce, roll and pitch motions. The new approach aims, by using a motion detection method, at designing a controller which is able to adapt the suspension forces at the four corners of the vehicle, in order to mitigate the road-induced effects. ...Show More
The enhancement of passengers' comfort and their safety are part of the constant concerns for car manufacturers. Semiactive damping control systems have emerged to adapt the suspension features, where the road profile is one of the most important factors determining the automotive vehicle performance. Because direct measurements of the road profile represent expensive solutions and are susceptible...Show More
In this paper, we consider the boundary control of the fresh air mass fraction in a Diesel engine operated with low-pressure exhaust gas recirculation. The air mass fraction transport phenomenon is modeled using a cascade of first-order linear parameter-varying hyperbolic systems with dynamics associated with their boundary conditions. By means of Lyapunov-based techniques, sufficient conditions a...Show More
In this paper, early lumping estimation of space-time varying diffusion coefficient and source term for a nonhomogeneous linear parabolic partial differential equation (PDE) describing tokamak plasma heat transport is considered. The analysis of this PDE is achieved in a finite-dimensional framework using the cubic b-splines finite element method with the Galerkin formulation. This leads to a fini...Show More
The road profile is one of the most important factors that determines the automotive vehicle performance; specially, when it is used to adapt the suspension features. Direct measurements of the road represent expensive solutions and are susceptible to be contaminated. This paper proposes a novel road profile estimation method based on classic vehicle measurements to online compute the road roughne...Show More
This paper addresses an integration of two advanced vehicle controllers. The first one is developed for coupled control of longitudinal and lateral vehicle's motions. It takes advantage of differential flatness of nonlinear systems and algebraic identification techniques for denoising and numerical differentiation. The second one is an LPV/ℋ∞ controller for suspension system designed to adapt the ...Show More
This paper proposes a LPV/ℌ∞ fault tolerant control strategy for roll dynamics handling under semi-active damper's malfunction. Indeed, in case of damper's malfunction, a lateral load transfer is generated, that amplifies the risks of vehicle roll over.Show More
This paper presents a new LPV/ℋ∞ semi-active suspension control strategy for a commercial vehicle equipped with 4 Magneto-Rheological dampers. The proposed approach concerns road adaptation using on-line road profile identification based on a non linear algebraic observer with unknown input. Then, the suspensions forces distribution in each corner of vehicle is performed considering roll dynamics....Show More
In this paper, we discuss on-line adaptive estimation of distributed diffusion and source term coefficients for a non-homogeneous linear parabolic partial differential equation describing heat transport. An estimator is defined in the infinite-dimensional framework having the system state and the parameters' estimate as its states. Our scheme allows to estimate spatially distributed and space-time...Show More
A novel fault tolerant strategy to compensate multiplicative actuator faults (damper oil leakages) in a semi-active suspension system is proposed. The compensation of the lack of damping force caused by a faulty damper is carried on by the remainder three healthy semi-active dampers. Once a faulty damper is detected and isolated by a Fault Detection and Isolation strategy based on parity-space, an...Show More
This paper is concerned with a new LPV/H∞ coordination strategy that improves the vehicle stability using suspension, active steering and electro-mechanical braking actuators. The new coordination technic aims, by monitoring the load transfer distribution of the vehicle while facing road irregularities, at tuning the suspensions in the four corners of the vehicle and improving vertical performance...Show More
We investigate the joint estimation of time and space distributed parameters and input in the tokamak heat transport equation. This physical phenomenon can be modelled by a non-homogeneous linear parabolic partial differential equation (PDE). The analysis of this PDE is achieved in a finite dimensional framework using the cubic b-splines finite element method. The application of the parameter proj...Show More