Pressure performance improvement by dual-mode control in digital pump/motor
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Pressure performance improvement by dual-mode control in digital pump/motor LI Chun-shuang(李春爽)1, WANG Xin(王昕)1, 2, QI Hai-bo(齐海波)1, LIU Xin-yu(刘新宇)2, LIU Xin-hui(刘昕晖)1 1. School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, China; 2. Department of Mechanical and Industrial Engineering, University of Toronto, Toronto M5S 2E8, Canada © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Due to the advantages of low cost, fast response and pollution resistance, digital hydraulic pump/motor can replace conventional variable hydraulic pump/motor in many application fields. However, digital hydraulic components produce large hydraulic impact at variable moments, which will shorten the service life of mechanical components. Through the simulation analysis of the variable process of digital pump/motor, it is found that the discontinuous flow caused by displacement step changes is the fundamental cause of hydraulic impact. The data analysis results of experimental tests are in good agreement with the simulation analysis results. In view of hydraulic secondary components, a variable control method based on dual-mode operating characteristics is proposed. The TOPSIS algorithm is used to give comprehensive evaluation of the displacement control results after this method. The results show that the control quality of digital pump/motor after adopting the control method has been effectively improved, with an average improvement of about 40%. Key words: digital hydraulic; dual-mode operating characteristics; AMESim simulation; TOPSIS algorithm Cite this article as: LI Chun-shuang, WANG Xin, QI Hai-bo, LIU Xin-yu, LIU Xin-hui. Pressure performance improvement by dual-mode control in digital pump/motor [J]. Journal of Central South University, 2020, 27(9): 2628−2642. DOI: https://doi.org/10.1007/s11771-020-4487-7.
1 Introduction Compared with the traditional transmission scheme, hydraulic transmission has an incomparable advantage of high-power density [1]. However, many commercial products don’t use hydraulic system because it is inefficient and difficult to control under partial load (light load/ low displacement). Digital hydraulic is a new technology that obtains system variable outputs through real-time control of discrete hydraulic components [2]. Compared with traditional hydraulic variable control, digital hydraulic has the
advantages of low cost, high response, easy control and high efficiency [3−6], which has received extensive attention in the hydraulic industry in recent years [7−9], and has been applied in large-scale equipments such as loaders [10] and excavators [11, 12]. Due to the advantages of digital hydraulic, scholars in various fields have carried out research at this stage. In August 2010, more than 100 scholars from all over the world gathered together in the third digital hydraulic seminar, which showed the growing interest in digital hydraulic technology. Digital hydraulic has two basic branches, parallel digital hydraulic t
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