Coupling Safety Distance Model for Vehicle Active Collision Avoidance System 2019-01-0130

As an important part of the active collision avoidance system of the vehicle, the safety distance model determines the safety of the vehicle and the utilization of the road. The safety distance is too large to affect the traffic flow of the road. If it is too small, it will cause traffic accidents. Therefore, the design of the safety distance model depends on whether it can adapt to the complex and changing traffic environment, and effectively balance the safety of the driving process, the car following and the utilization of the road. According to the actual requirements of system security alarm and system false alarm reduction, three safety distance models and one constraint condition are established. The safety distance model maintained by the vehicle spacing, the safety distance model reflecting the characteristics of the driver, and the longitudinal minimum safety distance model when steering the lane change. When the pre-crash time is equal to the driver response time, the distance at this time is the minimum constraint condition of the warning distance. Based on these, a coupled safety distance model is established. The correctness of the coupled safety distance model is verified by the joint simulation of MATLAB/Simulink and CarSim. The simulation results show that the coupled safety distance model can achieve the system safety warning and the safety active braking function. The false alarm rate and the emergency braking false trigger rate of the active collision avoidance system are low. It can well eliminate the false alarm when the car turns to change lanes.