Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 8, Pages 7221-7232Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3001808
Keywords
Valves; Control systems; Fault tolerant systems; Hardware; Actuators; Layout; Hydraulic systems; Electro-hydraulic (EH); fault-tolerant control (FTC); independent metering valve (IMV); mobile machinery
Categories
Funding
- National Natural Science Foundation of China [51835009]
- Jiangxi Provincial Excellent Young Funding Program [20192BCBL23005]
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This article proposes an active fault-tolerant control system for independent metering valve faults, deriving analytical redundancy through the coordinated control of other fault-free valves to adapt to unmodeled fault dynamics, reducing degradation in motion tracking and energy-saving performance.
Aiming at the tough requirements for safety and maintainability in mobile hydraulic systems, in this article, an active fault-tolerant control (FTC) system is proposed against the valve faults of an independent metering valve. Not only moderate faults of activated valves, but also significant faults and unactivated valve faults are considered. Without additional hardware redundancy, analytical redundancy is derived by the coordinate control of other fault-free valves. Accordingly, an FTC system in parallel with a normal controller is designed based on the pressure feedback. It consists of a set of reconfigurable controllers and a decision mechanism. The control signals, control loops, and operating modes can all be precisely reconfigured to adaptively match unmodeled fault dynamics. A bumpless transfer controller based on a latent tracking loop is designed to smooth the switching between the normal controller and FTC. Consequently, random valve faults can be tolerated with minor degradations in motion tracking and energy-saving performance. The feasibility of the FTC system is evaluated by a 2-ton excavator.
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