Vehicle collision warnings based on a time-to-collision

摘要

A vehicle collision warning system comprising a host vehicle which includes a sensor to detect an object, a speed sensor to measure the current speed of the vehicle and a collision alerter. The alerter determines the distance to the object 404 and determines a time to collision TTC 408 based on said distance and current speed. In response to the TTC being less than or equal to a first threshold, a first alarm is emitted 412. The sensor may be an ultrasonic sensor and the alarm may include a continuous audible signal. If the TTC is greater than the threshold, the system may predict a future speed of the vehicle 416 based on pedal positions and angles 414 and, in response to the predicted speed being less than the current speed 418, compare the TTC to a second threshold which is greater than the first threshold 420. The system may emit a second, intermittent audible alarm 422, in response to the second threshold being met.