The concept of focus point preview is proposed, and fractional calculus is introduced to driver model to build focus point preview\ndriver model. A formula for calculating lateral error is given, where the weight coefficients of fractional calculus are designed to\nimitate the driverâ??s focus preview property. The relationship between the speed and the order of fractional calculus is studied. A\ndriver-vehicle-road simulation system is set up to illustrate the performances of the proposed previewmodel.TheS-type road is used\nto test the model in the case of continuous small curvature turns and the Shanghai F1 track model is used as the case that automobile\npassing large curvature curve.Theperformances are evaluated fromtwo aspects: path tracking effect and vehicle dynamic responses.\nIt is concluded that, as the speed of the vehicle increases, the optimal order of fractional integral increases, so that the order is seen\nas the degree of driverâ??s attention. What is more, in the case of large curvature, the path tracking performance is improved by\nincreasing the corresponding fractional order. Simulations results also show that, compared with the single-point preview model,\nthe performances of the focus point preview model are better. On the one hand, the proposed driver model can be used to control\nthe vehicle steering and path tracking. On the other hand, fractional calculus is used to reveal the driver preview property and the\norder is given a certain physical meaning, which is conducive to the development of fractional calculus applications.
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