June 26, 2011
June 26, 2011
June 29, 2011
22.214.1 - 22.214.13
Application of Micro Computers in Design of Self-tuning ControllersAbstractThe speed and accuracy of microprocessors has extensively changed the way control systems aredesigned. Process controllers can be “taught” to adjust themselves without any operator intervention.These self-tuning or adaptive controllers are programmed to provide a stable system response undervarious disturbance conditions.This paper presents a fluid level system to be modeled and controlled utilizing an adaptive PIDcontroller to improve the output response to a step input. The digital controller will provide therequired output with variations in a single plant parameter. A fully adaptive controller will then beimplemented using PC Matlab to allow for any of the plant parameters to vary and still maintain asuitable output. This concept can be used in Senior Design Project Course as well as in MasterPrograms in developing nations with limited resources.The popularity of the PID controller and the increased use of microprocessors has led to a digitalversion of the algorithm for use in computer control applications. The first part of this paper will lookat the output response of the specified plant to a step input. Some of the plant parameters will beadjusted to obtain the best results. The next part will show how the system response is improved byadding a PID controller. A digital PID controller will be used so that the controller parameters can beadjusted on-line to account for variations in one of the plant values. Pole placement technique will beused in the design. One of the plant parameters that can be externally adjusted will be varied. It will beshown that the system response will remain the same over the entire range of adjustment. The last partwill show how an adaptive controller will allow any of the plant parameters to vary without greatlychanging the system response. The least-squares algorithm will be used to update the controller valuesduring every sampling period.
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