Integrated Approach to Improving Automotive Vehicle Safety

从一次整车安全的角度出发，提出了几种车辆底盘控制规律来稳定车辆的运动，并通过计算机仿真验证了控制效果。它还在试验场上使用实验车进行了验证。结果表明，利用轮胎侧向力和纵向力进行侧偏角和横摆率的协同控制，可以显著提高车辆的稳定性和车辆的响应性。此外，根据ITS中道路环境的一些可能信息，研究了在交通流中的紧急情况下主动驾驶员辅助系统的可能性。与驾驶员-车辆系统和底盘控制相比，驾驶员-车辆系统和利用自身车辆运动信息的底盘控制相比，在避让变道过程中跟随助力系统类型的侧向加速度模型对改善避让特性具有显着的效果。从汽车二次安全性的角度，重点介绍了机械波的概念。汽车高速碰撞等动态断裂行为往往与静态断裂行为有很大的不同。研究了受冲击力作用的材料中动态应力分布的特征导致的断裂行为。这包括裂纹尖端的微观缺陷对应力集中的影响、平行缺口间动态集中的干扰效应以及含裂纹构件的冲击应力。管材成型是解决环境安全问题的关键技术之一。对铝制网架管件的“偏置辊弯”成形工艺进行了可行性研究，为实际生产提供了合理的生产工艺。

From the view points of primary vehicle safety, a number of vehicle chassis control laws are proposed to stabilize the vehicle motion and the effects of the controls are proved with the computer simulation. It is also validated on a proving ground using the experimental vehicle. The results shows that the cooperative control of side-slip angle and yaw rate using tire lateral force and longitudinal one gives us dramatic improvement of vehicle stability as well as vehicle responsiveness. In addition to the above, a possibility of an active driver assist-system during emergency situation in a traffic flow depending on some possible information from the road environment in ITS is investigated. A lateral acceleration model following type of assist system during evasive lane change shows significant effects on the improvement of avoidance characteristics compared the driver-vehicle system with chassis control using information of it's own vehicle motion. From the view point of secondary vehicle safety, an emphasis is laid on the concept of mechanical wave. A dynamic fracture behavior such as car crash in high speed is often quite different from the static behavior. This fracture behavior due to the characteristic properties of the dynamic stress distribution in a material subjected to an impact force is investigated. These are the influence of microscopic defect near a crack-tip on the stress concentration, the interference effect of dynamic concentration between two parallel notches and the impact stress of cracked structural member. A tube forming is one of the key technology for the environmental issue compatible with safety. A feasibility study on " Off-set Roller Bending" for a tube forming of aluminum space frames is conducted to give a reasonable production technology for real use.