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Subject: search.filters.subject.Continuous-time

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    Closed-form formulas for continuous/discrete-time pidaj controller's parameters
    (2019-07-01)
    Ukakimaparn, Prapart
    ;
    Tirasesth, Kitti
    ;
    Trisuwannawat, Thanit
    ;
    Pannil, Pittaya
    This paper focuses on establishing the closed-form formulas to design a proportional-integral-derivative-acceleration-jerk (PIDAJ) controller for fourth-order pla- nts. After plant modeling, the analog PIDAJ controller in continuous-time domain can be designed by utilizing the proposed formulas in a vector-matrix form. Based on bilinear transform, the digital PIDAJ controller in discrete-time domain can then be achieved. The use of the proposed formulas to determine the PIDAJ controller's parameters for controlling the air-fuel ratio of an engine is described as an application example to con- _rm their feasibility. MATLAB simulation results con_rm the consistency between step responses of the example system controlled by the designed controllers in continuous-time domain and discrete-time domain.
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    Design of discrete-time pida controller using kitti’s method with first-order hold discretization
    (2018-06-01)
    Pannil, Pittaya
    ;
    Sungsorn, Teenapong
    ;
    Trisuwannawat, Thanit
    ;
    Ukakimaparn, Prapart
    This paper proposes a successful technique to design a discrete-time (DT) proportional-integral-derivative-acceleration (PIDA) controller for third-order plants. The proposed technique consists of three major steps: discretization of the controlled plant using the first-order hold (FOH) method, discretization of the continuous-time (CT) PIDA controller structure using the delayed first-order hold (DFOH) method to achieve the DT PIDA controller structure, and design of the target controller using the Kitti’s method. Simulation results confirm that the controller designed by utilizing the proposed technique provides equivalent performances compared to a conventional CT controller and a DT controller discretized by utilizing the Tustin’s method.