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Jun Zhang
Chang’an University

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Dynamic Characteristics for Leveling System of Mobile Elevating Work Platforms Xue-peng Cao; Sheng-jie Jiao; Lei Cheng; Jun Zhang; Jin-ping Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Focused on revealing variations of dynamic characteristics of an auto-leveling system used in mobile elevating work platforms (MEWP) at large height, a unified mathematical model composited of a series of sub-models was built for the leveling systems. An effect on dynamic characteristics including the fast response and relative stability from varying-parameters was investigated. Results displayed the displacement-angle factor changing with work-conditions tended to cause fluctuations of the stability, while enlarging the amplifier gain would accelerate system response. Increasing the area ratio was conducive to leveling stability to be reinforced, but lead a different response speed for forward process or reverse leveling, which was harmful to overall stability. The findings would provide essential theory guidance for the design and manufacture of the leveling system devices of high altitude platform. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4914
Engine Speed Control of Excavator With PID Method Jun Zhang; Shengjie Jiao; Guimao Si; Xuepeng Cao; Min Ye; Jinping Li; Xinxin Xu; Daopei Zhang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Distinction work task power-matching control strategy was adapted to excavator for improving fuel efficiency; the accuracy of rotate engine speed at each work task was core to excavator for saving energy. 21t model excavator ZG3210-9 was taken as the study object to analyze the rotate speed setting and control method, linear position feedback throttle motor was employed to control the governor of engine to adjust rotate speed. Improved double closed loop PID method was adapted to control the engine, feedback of rotate speed and throttle position was taken as the input of the PID control mode. Control system was designed in CoDeSys platform with G16 controller, throttle motor control experiment and engine auto control experiment were carried on the excavator for tuning PID parameters. The result indicated that the double closed-loop PID method can take control and set the engine rotate speed automatically with the maximum error of 8 rpm. The linear model between throttle feedback position and rotate speed is established, which provides the control basis for dynamic energy saving of excavator. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4917
Co-Authors Daopei Zhang Guimao Si Jin-ping Li Jinping Li Lei Cheng Min Ye Sheng-jie Jiao Shengjie Jiao Xinxin Xu Xue-peng Cao Xuepeng Cao