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This paper presents a new observer design for Lipschitz nonlinear continuous-time systems with nonuniformly sampled measurements. Based on recent results in sampled-data control of linear continuous-time systems, linear matrix inequality (LMI) conditions are established to guarantee global stability of the estimation error dynamics and to design the(More)
This paper presents new observers for Lipschitz nonlinear systems, for systems with nondecreasing nonlinearities, and for linear systems. The dynamics of these observers exhibits impulsive dynamical behavior due to the update of the observer state at discrete instants of time. Conditions are given to ensure global convergence of these observers and possible(More)
Control of turbocharged diesel engines is a challenging task due to system nonlinearities and constraints on the inputs and process variables. In this paper nonlinear model predictive control is applied to control a diesel engine with a variable geometry turbocharger and an exhaust gas recirculation valve. The overall control objective is to regulate the(More)
This paper presents a new observer for the class of linear continuous-time systems. In contrast to many well-established observers, which normally estimate the system state in an asymptotic fashion, the proposed observer estimates the exact system state in predetermined finite time. The finite convergence time of the proposed observer is achieved by(More)
There are well-known theoretical examples that show that stability constraints in nonlinear model predictive control (NMPC) are necessary in order to guarantee closed loop stability. In this paper it is shown that these stability constraints, derived from theory, are also essential in practice. In particular, an experimental study is carried out on a four(More)
This paper presents a new observer that estimates the exact state of a linear continuous-time system in predetermined finite time. The finite convergence time of the proposed observer is achieved by updating the observer state based on the difference between the measured output and the estimated output at discrete time instants. Simulation results are(More)
This paper presents an observer for the class of nonlinear time-delay systems. The proposed observer is based on recent results in extended Kalman filtering for the class of deterministic nonlinear systems. However, the observer differs from the extended Kalman filter (EKF) by an additional term in the Riccati differential equation that takes the delayed(More)
This paper presents a finite time unknown input observer for linear systems, i.e. an observer which estimates the exact state of a linear system with unknown input disturbances in a predefined finite time. Based on recent results in observer design for linear systems, conditions are established to guarantee finite time convergence of the estimation error(More)
The purpose of this note is to establish a certainty-equivalence feedback design for inverse optimally controlled affine systems. In particular, it is shown that a class of polynomial-type state feedbacks in conjunction with a globally asymptotically convergent observer leads to a globally asymptotically stable closed-loop. A key step in the proposed(More)
Typically one desires to control a nonlinear dynamical system in an optimal way taking constraints on the states and inputs directly into account. Classically this problem falls into the field of optimal control. Often, however, it is difficult, if not impossible, to find a closed solution of the corresponding Hamilton-Jacobi-Bellmann equation. One possible(More)