A control method of deceleration assistance system for collision avoidance based on driver's perceptual risk

Abstract

PurposeThe purpose of this paper is to realize a smooth and secure brake assistance system to avoid rear‐end collision of automobiles.Design/methodology/approachIt is important to judge necessity of deceleration assistance as early as possible and initiate the assistance naturally in order to reduce rear‐end crashes. However, it easily results in driver's discomfort. In addition, deceleration profile of the automatic braking is also important to realize smooth collision avoidance. In this paper, a deceleration assistance control for collision avoidance will be proposed based on the formulated braking behavior models of expert drivers to realize smooth, secure brake assistance.FindingsThe proposed brake assistance system can realize smooth deceleration profile and appropriate final status of the two vehicles for various approaching conditions. In addition, experimental results using a driving simulator will show validity of the proposed system based on subjective evaluation. It is also shown that the system realizes smooth deceleration control even under existence of the interaction between human driver and the system.Research limitations/implicationsThis paper does not deal with effect of the deceleration method on change of drivers' behavior, including driver's trust on the system. Over‐trust should be eliminated if any.Originality/valueThe originality of the paper is to derive smooth secure collision avoidance system based on the driver's perceptual risk model. This method can realize smooth collision avoidance behavior for the various approaching conditions with a unified simple algorithm.