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Continuous Stirred Tank Reactors (CSTR) are the most important and centralequipment in many chemical and biochemical industry that exhibit second ordercomplex nonlinear dynamics. The nonlinear dynamics of CSTR poses many designand control challenges. The proposed controller guarantees a stable closed loopbehavior over multiple operating points even in presence of disturbances andparametric uncertainties. An event driven sliding mode control is presented inthis work to regulate the temperature and concentration very close to theequilibrium points of CSTR. The control is executed only when a predefinedcondition gets violated and hence the controller is relaxed when the system isoperating under tolerable limits in terms of closed loop performance. A noveldynamic event triggering rule is presented to maintain desired performance withminimum computational cost. The inter event execution time is shown to be lowerbounded by a finite positive quantity to exclude Zeno behavior. Sliding modecontrol (SMC) combined with event triggering scheme retains the inherentrobustness of traditional SMC and aids in reducing computational load on thecontroller involved. Simulation results validate the efficiency of the proposedcontroller.

Control of a nonlinear continuous stirred tank reactor via event triggered sliding modes