Adaptive event-triggered control for uncertain nonlinear systems with unknown measurement sensitivity via output feedback

This paper addresses the global state regulation problem via event-triggered output feedback for a family of uncertain nonlinear systems with unknown measurement sensitivity. The uncertain nonlinearities exhibit linear growth in upper-triangular unmeasurable states. Notably, the growth rate is an unknown function of both the input and output. This problem is challenging because complicated nonlinearities and unknown measurement sensitivity exist in the systems simultaneously. We propose a novel adaptive event-triggered output feedback strategy that uses only one dynamic gain. The presented control method can globally regulate all the states of the systems while precluding Zeno behaviour. Practical and theoretical examples are provided to verify the feasibility of the proposed control scheme.