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IEE Proceedings D - Control Theory and Applications

Issue 2 • Mar 1989

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Displaying Results 1 - 8 of 8
  • New computationally efficient formula for backward-pass fixed-interval smoother and its UD factorisation algorithm

    Publication Year: 1989, Page(s):73 - 78
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A UD factorisation-based backward-pass fixed-interval smoother that is numerically reliable and stable is derived for linear stochastic discrete-time systems. A computationally efficient recursion of a classic backward-pass smoother is first obtained, so that the smoother can exclude the well-known shortcomings of the classic version and utilise the outputs of a forward-pass information filter. Th... View full abstract»

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  • Decoupling in nonlinear systems: from linearity to nonlinearity

    Publication Year: 1989, Page(s):53 - 62
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (946 KB)

    A standard approach for dealing with synthesis problems in nonlinear control systems consists in linearising the nonlinear system around a specific working point and, then, solving the synthesis problem for the obtained linear system. To what extent the resulting linear controller is a good approximate solution for the nonlinear problem is questionable. The authors discuss, as an example, the inpu... View full abstract»

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  • Lower bounds for the stability margin of linear continuous systems based on weighted performance criteria

    Publication Year: 1989, Page(s):63 - 67
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (425 KB)

    Lower bounds for the stability margin of linear continuous systems with unknown system parameters are developed. These lower bounds are obtained as a function of the weighted performance criteria computed from the measurements of the system's impulse response. The properties of the proposed method are discussed and it is shown that the bounds can be improved by increasing the order of the weightin... View full abstract»

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  • Homotopy method for solving algebraic Riccati equations

    Publication Year: 1989, Page(s):68 - 72
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (385 KB)

    A numerical method is presented for solving algebraic Riccati equations, as required in the design of optimal linear control systems. The proposed method possesses an almost globally convergent characteristic and, hence, is very suitable for finding the Riccati equation solution of an ill conditioned control system. The new method is simple and easy to implement. Some typical numerical examples ar... View full abstract»

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  • A class of discrete-time models for a continuous-time system

    Publication Year: 1989, Page(s):79 - 83
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    An equivalence class, called the T-equivalence class, is introduced for discrete time models of a continuous-time system, such that any member of this class has the same input/output characteristics when the discrete-time interval approaches zero. This concept provides a systematic way of viewing the relationship between discrete and continuous-time systems.<> View full abstract»

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  • Engine control system using a cylinder pressure sensor

    Publication Year: 1989, Page(s):84 - 88
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (431 KB)

    Individual cylinder combustion control systems using a cylinder pressure sensor have a system already been introduced to realise a system, highly tolerant of the variability of engine components, fuel quality and environmental conditions. The paper deals with such an application of a cylinder pressure sensor to air/fuel ratio control, which is to control air/fuel ratio to the lean limit of engine ... View full abstract»

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  • Approach to pole assignment by centralised and decentralised output feedback

    Publication Year: 1989, Page(s):89 - 97
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (830 KB)

    The paper presents a method for output feedback pole assignment in both centralised and decentralised systems. For the nth-order m-input l-output system (A, B, C), the existence of a solution to the pole-assignment problem is determined by checking the rank of a certain matrix E formed from the matrices CA/sup i/B, i=0, 1, . . ., n-1. It is shown that when rank(E)=n, it is possible to assign min(n... View full abstract»

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  • Self-tuning control in the presence of periodic disturbance

    Publication Year: 1989, Page(s):98 - 104
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (570 KB)

    A pseudo-feedforward method is proposed for adapting an incremental self-tuning controller to reject periodic disturbances. The algorithm begins with an estimate of the disturbance frequency. The amplitude and phase of the disturbance are estimated by augmenting the parameter estimation vector. The estimated disturbance can then be used as a feedforward term with the self-tuning controller. A seco... View full abstract»

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