Judgment for Avoiding Collision with a Following Vehicle

Abstract

The authors aim to develop an autonomous braking system for unconscious car drivers. This paper describes a method for avoiding collision with a following car, which decreases driver's loads. Dynamics between two cars is modeled based on equation of motions. A conditional expression for collision avoidance is derived from the dynamics. We examine own car's deceleration a_p0 and reaction time of the following car T for the collision avoidance, which the speeds of own car and following car are set 40 km/h and 50 km/h, respectively, and a vehicle-to-vehicle time is varied from 1.0 s to 2.0 s. Consequently, the collision is avoided at all the vehicle-to-vehicle time by setting a_p0 -1.3m/s². The collision is also avoided by setting T 0.1. Small T is better solution than a_p0 because total running distance becomes small.