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Self-adaptive design of a nonlinear temperature control system

Self-adaptive design of a nonlinear temperature control system

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© The Institution of Electrical Engineers
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The paper describes the design and implementation of an unusual self-adaptive temperature control system for a nonlinear heated bar system. The design is based on a proportional-integral-plus (PIP) control scheme, combined with a special recursive algorithm which continually updates the estimates of the rapidly variable parameters which characterise a piecewise-linear model of the heated bar system. Amongst the novel features of this true digital control (TDC) system design are: the nonminimum states-space (NMSS) formulation of the control problem, which allows for state-variable feedback pole assignment using only sampled input and output signals in the control law; the incorporation of a priori information on the physical nature of the system into the recursive estimation algorithm in order to enhance its parameter tracking capabilities; the exploitation of multirate sampling; and the implementation of the linear PIP control law in a bang-bang mode using pulsewidth modulation.

Inspec keywords: digital control; poles and zeros; nonlinear control systems; adaptive control; temperature control; control system synthesis; two-term control; self-adjusting systems

Other keywords: piecewise-linear model; states-space; parameter tracking; self adaptive control; linear PIP control; bang-bang mode; nonlinear temperature control system; true digital control; heated bar system; multirate sampling; proportional integral plus control; state-variable feedback pole assignment

Subjects: Self-adjusting control systems; Thermal variables control; Control system analysis and synthesis methods; Nonlinear control systems

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