Paper Info
Title
Precision Motion Control of an Independent Metering Hydraulic System With Nonlinear Flow Modeling and Compensation
Abstract
The independent metering system decouples the meter-in and meter-out flows of the chamber, giving extra control flexibility and can reducing energy consumption while keeping motion control accuracy. The control performance of the independent metering system is significantly determined by the valve characteristics.Valve nonlinearities, such as deadband, nonlinear flow gain, and leakage, may restrict the control accuracy. To address the issue and improve the system control precision, the nonlinearities of the valve need to be further modeled. In this article, a nonlinear valve flow model is proposed to accurately depict the relationships between the flow rate, pressure drop, and input voltage. The valve deadband is compensated by the static inverse function, while a certain polynomial projection function is used to mimic the nonlinear flow curve outside the deadband. To deal with uncertainties and nonlinearities in the independent metering system, an adaptive robust control approach is synthesized. The least-squares estimation law is adopted to online adapt the valve parameter and other system parameters. Comparative experiments were carried out to illustrate the effectiveness of the proposed approach. The results show that the valve flow nonlinearities are further captured by the proposed model, and the independent metering system performed a higher level control precision.
Year
DOI
Venue
2022
10.1109/TIE.2021.3102434
IEEE Transactions on Industrial Electronics
Keywords
DocType
Volume
Adaptive robust control,flow compensation,hydraulic control,independent metering system,online parameter estimation,polynomial approximation
Journal
69
Issue
ISSN
Citations 
7
0278-0046
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
Chen Li100.34
Litong Lyu200.68
Bobo Helian321.06
Zheng Chen4398.99
B. Yao594098.18