德国加强危险品汽车运输的安全研究

当前,大量危险品在国外大多是由专用汽车运输的,因此,汽车运输危险品越来越受到普遍的重视,便是一个鲜明例子。 1960年德国专用汽车的危险品运输量占总运输量的4％,1986年增加到12％。近年来汽车的危险品运输量又有了较多的增加,年运输量达到了2亿吨左右,即每一工作日运输量约为16万吨。

Vehicle path tracking by integrated chassis control

The control problem of trajectory based path following for passenger vehicles is studied. Comprehensive nonlinear vehicle model is utilized for simulation vehicle response during various maneuvers in MATLAB/Simulink. In order to follow desired path, a driver model is developed to enhance closed loop driver/vehicle model. Then, linear quadratic regulator(LQR) controller is developed which regulates direct yaw moment and corrective steering angle on wheels. Particle swam optimization(PSO) method is utilized to optimize the LQR controller for various dynamic conditions. Simulation results indicate that, over various maneuvers, side slip angle and lateral acceleration can be reduced by 10% and 15%, respectively, which sustain the vehicle stable. Also, anti-lock brake system is designed for longitudinal dynamics of vehicle to achieve desired slip during braking and accelerating. Proposed comprehensive controller demonstrates that vehicle steerability can increase by about 15% during severe braking by preventing wheel from locking and reducing stopping distance.

智能汽车

已经是午夜时分,拉里开着汽车在高速公路上快速行驶,车速为每小时105公里。他很困倦,注意力也分散了,没有看到汽车前方有一辆卡车。这辆卡车尾灯发出的光很弱,车速也不很快,两辆车之间的距离逐渐缩短。就在拉里的车快要撞上前面的卡车时,汽车自动减速,车速降为每小时80公里,两辆车之间保持着安全的距离。