For the tough requirements of maintainability and safety in mobile hydraulic systems, a valve active fault-tolerant control(VFTC) system and a sensor active faulttolerant control(SFTC) system for IMCS are proposed respectively. Against valve faults, moderate faults of activated valves, significant faults, and unactivated valve faults are considered. Analytical redundancy is used to coordinate control other fault-free valves. Additionally, the VFTC system consists of reconfigurable controllers and a decision mechanism, and it is in parallel with a normal controller (NC) based on pressure feedback. To adaptive matching unmodeled fault dynamics, the control signals, control loops, and operating modes can all be precisely reconfigured. Finally, to realize a smooth signal transition from NC to VFTC, a bumpless transfer (BT) controller based on a latent tracking loop is designed. Likewise, against sensor faults, this controller utilizes analytical redundancy rather than additional hardware redundancy. The core of redundancy analysis is the reconfiguration of control variables. Meanwhile, the design of the BT controller based on latent tracking ensures the stability of the switch, so that the abrupt output jump of SFTC is suppressed, and smooth switching is realized when the sensor fault occurs. Finally, the practical applications on the 2-ton excavation are carried out to verify the feasibility of VFTC and SFTC.
Fault-Tolerant Control
Independent Metering Electro-Hydraulic Control System ; Kapitel : 6 ; 103-141
21.02.2024
39 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Fault diagnostics and fault tolerant control
IEEE | 1998
|AIAA | 2003
|NTRS | 1986
|NTIS | 1986
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