Aiming at the problem that the failure of time-to-collision(TTC)algorithm or safety distance algorithm of automatic emergency braking(AEB)system to take into account the safety and comfort during braking

a longitudinal collision avoidance control strategy is proposed that fuses the optimized SeungwukMoon algorithm and TTC algorithm.The delay characteristics of the system are analyzed

and the weight allocation of the influencing indicators of the driver’s reaction time is carried out by using the precedence ordering chart method to improve the precision of the SeungwukMoon algorithm model.Based on TTC algorithm

the influence of average braking deceleration and road adhesion coefficient is considered to determine early warming threshold.The simulation results show that compared with the SeungwukMoon algorithm

the early warning time of the proposed fusion algorithm in the standard test conditions of car-to-car rear moving(CCRm)and car-to-car rear stationary(CCRs)is delayed by 0.4s and 0.5s

respectively.The minimum safety distance is about 1m

which effectively avoids the longitudinal following collision of the vehicle and takes into account the safety and comfort of the emergency braking process at the same time.