  Motivated by the concept of Quasi-Sliding Mode (QSM) in discrete-time
systems, this paper presents a novel approach that relaxes the requirement of
ubiquitous exact sliding motion in continuous-time systems, aiming to achieve
an approximation- and chattering-free quasi-sliding mode controller (QSMC). The
proposed QSMC provides robust and chattering-free control for an unknown
nonlinear system without the need for intricate control methods, learning
agents, or system identification tools. Furthermore, comprehensive simulation
studies have been conducted to validate the effectiveness of the proposed
strategy.
