The Researching Of A Safe Distance Identified And Upper Control System For Collision Avoidance System Under Peturbation

With the popularity of cars, the number of traffic accidents and the resulting economic losses have been high. How to reduce or even avoid accidents has become the key content of national research and vehicle collision avoidance system is a major initiative in the field of security research.Based on the existing collision avoidance systems research results, vehicle dynamic model, safe distance identification model, host controller of active collision avoidance system are designed in this paper.A basic parameter in Chery is referenced, based on the throttle actuator system and brake actuator system, a vehicle collision avoidance dynamics model is built which taking into account the accuracy and simplicity. Presented by analog electronic accelerator pedal DAC analog signal, implement and electronic throttle control same effect, so as to control the throttle actuator motor drive mechanism; DC motor with steel wire in the form of a combination of structural design of the brake actuator.To ensure the practical and effective of the safety distance model, a rear-end collision warning safety distance model which taking into account the safety distance and security time, based on the multi-level warning strategy and fuzzy theory is built. This model can give the driver a more ample reaction time, and it reduces the false alarm rate greatly. The model can avoid rear-end accident in multiple cases, and has a good adaptability.To achieve collision avoidance system functions, and improve robust performance and robust stability of the vehicle collision avoidance control system, a hierarchical collision avoidance control strategy is designed. Parameter uncertainty, unmodeled dynamics and disturbance are analyzed in collision avoidance system and a host collision avoidance controller which is based on the μ theory is designed. The simulation results show that the proposed control strategy in this paper can meet the robust performance and robust stability of the vehicle collision avoidance control system.The research results improve active vehicle safety significantly, prevent rear-end accidents effectively, and is of great significance for the protection of traffic security.