Control Studies, Traffic Safety Distance Based Road Recognition

For the safety of driving, the government makes the rules that moving vehicles must have a definite distance between them. However, the varieties of road are not taken into account. The author investigated the correlation between the tire slip and the friction coefficient and brought forward a method that adjust the distance by parameter of the vehicles themselves.The effect of this method depends on the control arithmetic and the goal parameters. Moreover, these parameters change in different roads. The traditional ways estimate the friction between tire and road need many equipment, make the system complex, expensive and impractical. By means of filtering the digital signal of the vehicle speed, the acceleration of the vehicle is known and we can achieve the force of the tire by dynamics model. For eliminate the force sensor, we only use the wheel speed signal to detect the road and provide the most suitable control parameters for the system.This dissertation develops a arithmetic that calculate the vehicle acceleration by wheel speed and simulate it in computer. The model of the safety driving distance is another achievement of this thesis. All the results not only increase the utilization of highway but also provide the method and the theoretic foundation for the farther research of this subject.