Brief Paper - Multi-stage control strategy for quantised feedback control systems

This study establishes a multi-stage control strategy that can systematically reduce the effect of quantisation errors without resort to any prescribed control gains applicable to the stabilisation of quantisation-free systems. First of all, a two-stage control strategy is built under a fixed quantisation sensitivity, and then a multi-stage control strategy is established on the possibility of adjusting on-line the quantisation sensitivity. In the derivation, the overall control law is constructed with linear and non-linear feedback controls, where non-linear feedback control plays an important role of eliminating the effect of control input quantisation errors.