Research Of Speed Control Driver Model On Mountainous Freeway

With the continuous growth of our country’s mountainous freeway mileage,safety issues are apparent increasingly. By studying the characteristics of the real driver, this paper established an accurate and applicable speed control driver model to describe the driving characteristics of the driver driving on mountainous freeway,this research has an important reference value in design and safety evaluation of mountainous freeway.This study analyzed the behavior of real driver’s speed control and influential factors under different road condition.Closed-loop speed control driver model based on fuzzy control is established by applying relevant theories and methods.Studied the theory of building three-dimensional road model,the direction control driver model and vehicle dynamical model.The comprehensive control driver model is established by combining direction control driver model in Carsim based on second-order optimal preview of lateral acceleration with closed-loop speed control driver model based on fuzzy control theory,and then joined with Carsim vehicle model and three-dimensional road model in Carsim to built the driver-vehicle-road closed-loop simulation system.The road test is implemented by skilled drivers on Xi-Han freeway of Qinling,and collect the vehicle traveling state information, then the driver model parameters is calibrated by using trial and error method.By comparing the driver model’ speed curve with the real skilled driver’s under the same road alignment condition, we can see that the relative error between the simulation and the vehicle test is 8% on the upward road and 14% on the downward road.The results turns out that the closed-loop speed control driver model is highly accuracy and applicability.