Vehicle frontal collision warning/avoidance strategy

To evaluate the level of danger of current dynamic situation, a concept of collision avoidance time buffer, T_buffer, is proposed to calculate how much time buffer is left for driver or the control system to react. Based on T_buffer, a graded collision warning/avoidance algorithm is designed to adjust to different driving behaviors. Through audio/visual warning and active braking intervention, effective collision avoidance action can be realized. Simulations were carried out to compare the proposed algorithm with other four algorithms under three conditions. Results show that the proposed strategy is not only in accordance with driver's collision avoidance reaction, but also improves vehicle active safety effectively.