In this paper, a novel fuzzy modeling method is developed for a class of nonlinear system. The idea comes from the concepts of the Takagi-Sugeno (T-S) fuzzy modeling technique, and this method is especially suitable for the nonaffine nonlinear system. Firstly, an inverted pendulum mounted on motor-driven cart is illustrated to demonstrate the validity of modeling result. Besides this example, a nonaffine nonlinear system is illustrated to explain the proposed modeling scheme is more suitable to model the nonaffine nonlinear system into a T-S fuzzy system than some conventional fuzzy modeling schemes.

This paper aims at to realize the solar cell charged systems of 120W PV module with the dsPIC30F4011 control chip. All of the control schemes are written and accomplished with the C language. In the power converter, a single-ended primary inductance converter (SEPIC) is adopted which has the features including the buck-boost operating mode, no polarity inversion, low input current pulsation, and wide input voltage range, so, it is very suitable for the conversion of solar cell. In order to obtain the high efficient solar cell energy conversion, a fuzzy maximum power point tracking (MPPT) control is activated if the solarization is insufficient. The fuzzy controller is to maintain a charged current so as that the battery voltage can reach to desired value. The effectiveness of the proposed methods is demonstrated with the experimental results.

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In this paper, a novel fuzzy simplex sliding-mode controller is proposed for controlling a multivariable nonlinear system. The fuzzy logic control (FLC) algorithm and simplex sliding-mode control (SSMC) theory are integrated to form the fuzzy simplex sliding mode control (FSSMC) scheme which improves the system states response and reduces system states chattering phenomenon. In this paper, at first, we introduce the principle of simplex method, and then develop fuzzy controls based on the simplex method. Finally, a numerical example is proposed to illustrate the advantages of the proposed controllers, the simulation results demonstrate that the fuzzy simplex type sliding mode control scheme is a good solution to the chattering problem in the simplex sliding mode control.