Stability validation of a constrained model predictive networked control system with future input buffering

Authors: Tang, P. L.¹; de Silva, C. W.²

Source: International Journal of Control, Volume 80, Number 12, December 2007 , pp. 1954-1970(17)

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Abstract:

This paper addresses the stability of a newly-developed control strategy for networked control systems (NCS). This control strategy hones the potential of constrained model predictive control (MPC) by buffering the predicted control sequence at the actuator in anticipation of typical data transmission errors associated with NCS. Closed-loop stability in the sense of Lyapunov is guaranteed for the controller in the linear case, by bounding the projected receding horizon costs by lower- and upper-bounding terms using a predetermined terminal cost. A stability theorem is developed, which provides a suboptimal measure for the controller in real time, and is sufficient to estimate the worst-case transmission delay that can be handled by the developed control buffering strategy. The stability conditions, as governed by the theorem, are validated through real-time implementation on an electro-hydraulic servo system of an industrial processing machine, through an Ethernet network.

Document Type: Research article

DOI: http://dx.doi.org/10.1080/00207170701541072

Affiliations: 1: Honeywell, 3333 Unity Drive, Mississauga, ON, Canada L5L 3S6 2: Department of Mechanical Engineering, The University of British Columbia, Vancouver, B.C., Canada V6T 1Z4

Publication date: 2007-12-01

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