Robust output feedback control for the trajectory tracking of robotic wheelchairs

Published on Jan 1, 2015in Robotica1.509
· DOI :10.1017/S0263574714000071
J. Chocoteco5
Estimated H-index: 5
(UCLM: University of Castilla–La Mancha),
Rafael Morales16
Estimated H-index: 16
(UCLM: University of Castilla–La Mancha)
+ 1 AuthorsHebertt Sira-Ramírez61
Estimated H-index: 61
(CINVESTAV)
Sources
Abstract
This paper addresses the trajectory tracking control problem of robotic wheelchairs in the presence of modeling uncertainties. The controller has been designed using position and angular measurements. A global ultra-model, or simplified model achieved from flatness considerations is proposed first. This model highly reduces the design complexity of the state estimation and the output feedback control tasks since it groups, as an unknown time-varying disturbance, both the combined effects of all uncertain state-dependent (i.e., endogenous) nonlinearities and those of external (i.e., exogenous) perturbation inputs which are present in the input-to-flat output model of the system. An extended linear high-gain observer, or Generalized Proportional Integral (GPI) observer, is then developed for the simultaneous, though approximate, state and disturbance estimation. The proposed feedback controller combines the global ultra-model and the GPI observers to conform an active disturbance rejection, or disturbance accommodation, control scheme. The simulation results presented in the paper show that the proposed method has a very good tracking performance and robustness in the presence of system uncertainties, external disturbances and noisy corruptions.
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