Pinsopon, Unnat

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Pinsopon, Unnat
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Email
unnat.pi@kmitl.ac.th

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    Item type:Publication,
    Velocity control of electro-hydraulic pump control system using gear pump
    (2018-12-01)
    Jangnoi, Tossapol
    ;
    Pinsopon, Unnat
    Two types of velocity control electro-hydraulic systems, valve and pump flow control systems, were extensively investigated in this study. Valve flow control system tested in the study was one of the conventional types with the use of proportional valve and conventional gear pump. The proposed pump flow control system was of the simplest one. An inverter type variable speed drive was used to drive the same gear pump in order to adjust the pump speed and hence the discharge flow rate according to the desired cylinder velocity. Mathematical model of the pump flow control system is presented in the article, and its numerical simulation results were obtained by solving the state space equations. Open loop and proportional-integral (PI) closed loop performances of both valve and proposed pump flow control systems were tested and compared. Velocity tracking performance of valve flow control system either under open loop or PI closed loop control was always better than the proposed pump flow control system. However, the power consumption of the proposed system was much better than the valve flow control system. Response speed in terms of bandwidth frequency of the proposed system under open loop control was less than the valve flow control system by half due to the large inertia of motor-pump rotor. Under PI closed loop control, bandwidth frequency of the proposed system was improved to be 15% less than the valve flow control system.
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    Item type:Publication,
    Friction Compensated Force Control of Electro-Hydraulic System Using Fuzzy Controller
    (2022-10-31)
    Chanbua, Weerapong
    ;
    Pinsopon, Unnat
    Steady state and dynamic LuGre friction models of an electro-hydraulic system were constructed. Indirect electro-hydraulic cylinder force control under friction compensated PID and fuzzy controllers were tested and compared. Feedback force signal was indirectly measured and calculated from pressures to emulate the applications that direct force measurement is impossible. Estimated friction was compensated to desired force command of the PID controller. The proposed fuzzy controller contained two modules. The first, as a friction compensator, calculated modified error according to estimated friction and feedback force error. The second module calculated control action based on PD control scheme. Friction compensated PID and fuzzy controllers could reduce tracking errors at the maximum force commands by 80% and 90%, respectively, compared to the PID controller without compensation. The steady state friction compensation yielded better tracking performances compared to the dynamic friction. Tracking performance of the fuzzy controller was always better than the PID controller