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Abstract
In hydraulic area, independent metering control (IMC) technology is an effective approach to improve system efficiency and control flexibility. In addition, digital hydraulic technology (DHT) has been verified as a reasonable method to optimize system dynamic performance. Integrating these two technologies into one component can combine their advantages together. However, few works focused on it. In this paper, a twin spools valve with switching technology-controlled pilot stage (TSVSP) is presented, which applied DHT into its pilot stage while appending IMC into its main stage. Based on this prototype valve, a series of numerical and experiment analysis of its IMC performance with both simulated load and excavator boom cylinder are carried out. Results showed fast and robust performance of pressure and flow compound control with acceptable fluctuation phenomenon caused by switching technology. Rising time of flow response in excavator cylinder can be controlled within 200 ms, meanwhile, the recovery time of rod chamber pressure under suddenly changed condition is optimized within 250 ms. IMC system based on TSVSP can improve both dynamic performance and robust characteristics of the target actuator so it is practical in valve-cylinder system and can be applied in mobile machineries.
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Details
1 Zhejiang University, State Key Laboratory of Fluid Power and Mechatronic Systems, Hangzhou, China (GRID:grid.13402.34) (ISNI:0000 0004 1759 700X); Zhejiang University of Technology, College of Mechanical Engineering, Hangzhou, China (GRID:grid.469325.f) (ISNI:0000 0004 1761 325X); Zhejiang University of Technology, Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education & Zhejiang Province, Hangzhou, China (GRID:grid.469325.f) (ISNI:0000 0004 1761 325X)
2 Zhejiang University, State Key Laboratory of Fluid Power and Mechatronic Systems, Hangzhou, China (GRID:grid.13402.34) (ISNI:0000 0004 1759 700X)
3 Zhejiang University of Technology, College of Mechanical Engineering, Hangzhou, China (GRID:grid.469325.f) (ISNI:0000 0004 1761 325X); Zhejiang University of Technology, Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education & Zhejiang Province, Hangzhou, China (GRID:grid.469325.f) (ISNI:0000 0004 1761 325X)