Uros Kalabic

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In this paper, reference and extended command governors are developed for enforcing constraints in the air path of turbo-charged gasoline engines. These governors are add-on control schemes which protect the engine from violating pointwise-in-time state and control constraints, including compressor surge and actuator limits. Several design choices based on(More)
We develop nonlinear reference governor and nonlinear model predictive control schemes for constrained spacecraft attitude control. The schemes use the nonlinear discrete-time model of spacecraft dynamics based on the Lie group variational integrator evolving on SO(3) x SO(3). The reference governor is a computationally simpler add-on to the nominal(More)
— We propose a Model Predictive Control (MPC) policy for simultaneous station keeping and momentum management of a low-thrust nadir-pointing satellite in geostationary orbit around the Earth. The satellite is equipped with six electrically powered thrusters and three axisymmetric reaction wheels, which must be coordinated to control the satellite's orbital(More)
In this paper, a fast solver for the optimization problem arising in the nonlinear model pre-dictive control of spacecraft attitude is developed and simulation results of its application to constrained spacecraft attitude control are presented. The solver exploits the numerical solution of the necessary conditions for optimality in a discrete-time optimal(More)