With the increasing ubiquity of networked control systems, various strategies
for sampling constituent subsystems' outputs have emerged. In contrast with
periodic sampling, event-triggered control provides a way to efficiently sample
a subsystem and conserve network resource usage, by triggering an update only
when a state-dependent error threshold is satisfied. Herein we describe a
scheme for asynchronous event-triggered control (ETC) of a nonlinear plant
using sampler subsystems with hybrid dynamics. By exploiting inherent
differences in the plant and controllers time scales, the proposed scheme
permits independent sampling of plant and controller states. We extend existing
ETC literature by adopting a more general representation of the sampler
subsystem dynamics, thus accommodating different sampling schemes for both
synchronous and asynchronous ETC applications. We present a numerical example
in order to illustrate important operational considerations for the proposed
scheme