Sliding mode control
Sliding mode control a discontinuous control in which a sliding mode is deliberately induced. The design of a sliding mode controller consists of two phases. In the first phase, a sliding surface is specified by a designer. Then, in the second phase, feedback gains are selected so that the controlled system’s trajectories are driven toward the sliding surface. The role of a sliding mode controller is to drive the system’s trajectories to the surface and to maintain them on the surface, in sliding mode, for all subsequent time. While in sliding, the system is not affected by matched uncertainties. Furthermore, the system in sliding is governed by a reduced set of differential equations. This is called the order reduction, and it is a very useful feature in designing sliding mode controllers.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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