Evaluation and Improvement of Required Deceleration Algorithm in Frontal Collision Warning Systems

Different kinds of warning algorithms were used in the Frontal Collision Warning Systems (FCWS) for threat assessment, which were based on different kinds of kinematics measures of vehicles. In this paper, we discuss the required deceleration warning algorithm in two different situations, and consider a more complicated scenario. Based on field experiment data, we use an experienced driver's action which is denoted as "Real Acceleration" to evaluate the proposed algorithm's efficiency, and several other algorithms are evaluated for comparison. Furthermore, an improvement of required deceleration algorithm is proposed. The threat of lane-changing vehicle is also considered in the new algorithm.