Hiroto Hamane

Closed loop modelling method for non-linear system using Laguerre polynomials

This paper presents a modelling method for noisy response data of a closed loop with a PI controller. A general pre-£ltering procedure is not required in this method. A three-step procedure for estimating Laplace transfer function of a process is proposed. The true closed loop response is estimated from noisy response data, exploiting orthonormal properties of Laguerre functions. Then the closed loop transfer function model (called the Laguerre model) is represented by Laplace transforms of Laguerre polynomials approximated to a true response. Lastly, the process transfer function model is computed from the Laguerre model and the PI controller. PI parameters are given by gain constant, time constant and dead time of process approximated to £rst-order lag element plus dead-time system. Using this algorithm, the process model is estimated only by the settling time of response data. Simulation and experiment results show that the proposed method is effective for non-linear systems in modelling.

Thermal MIMO model and decoupling PID control

This paper presents a multi-input multi-output (MIMO) thermal model and the decoupling PID parameters for a commercialised temperature controller. The PID tuning can be performed by using the physical parameters. In addition, the problem of decoupling control is described. An improvement strategy based on robust observer is also presented in the extruder experiment results.

Industrial Temperature PID Controller for Pb-Free Soldering Iron

Abstract This paper presents a Pb-free soldering iron temperature controller in consideration of the use of an embedded micro-processor (MPU) with a low memory capacity. The proposed method is suitable for a wide use type commercial controller due to only a variable set point is applied to a PID controller. The proposed controller could solve the Pb-free soldering problem. The proposed method could be successfully applied to a commercial digital temperature controller. The controller has been commercialized.