초록 ▼

A system and method for controlling a vehicle speed to follow a preceding vehicle moving on the same traffic lane of a road as the vehicle. The system comprises: means for transmitting electromagnetic waves toward a vehicle movement direction, receiving the reflected waves from a reflecting object,

A system and method for controlling a vehicle speed to follow a preceding vehicle moving on the same traffic lane of a road as the vehicle. The system comprises: means for transmitting electromagnetic waves toward a vehicle movement direction, receiving the reflected waves from a reflecting object, measuring a distance to the reflecting object on the basis of a propagation delay time on the transmitted and reflected wave, and outputting respective Doppler signals derived from a relative movement of the reflecting object to the vehicle; means for calculating a change rate of the phase difference between the Doppler signals with respect to the measured distance; means for determining whether the reflecting object is the preceding vehicle on the basis of a magnitude of the differentiated phase difference with respect to a reference value associated with the distance and set according a radius of curvature of the traffic lane on which the vehicle moves; and means for controlling the vehicle speed so as to follow the preceding vehicle at a safe intervehicle distance on the basis of the vehicle speed and measured distance.

대표청구항 ▼

A system for controlling a vehicle speed, comprising: (a) first means for monitoring the presence of an object moving relative to the vehicle, measuring a distance from the vehicle to the moving object, and outputting Doppler signals having different directivities based on a movement of the moving o

A system for controlling a vehicle speed, comprising: (a) first means for monitoring the presence of an object moving relative to the vehicle, measuring a distance from the vehicle to the moving object, and outputting Doppler signals having different directivities based on a movement of the moving object relative to the vehicle; (b) second means for calculating a change rate of a phase difference between the Doppler signals derived from said first means with respect to the distance measured by said first means; (c) third means for determining a radius of curvature of a traffic lane on which the vehicle moves; (d) fourth means for determining whether the moving object monitored by said first means is moving on the same traffic lane as the vehicle on the basis of the magnitude of the change rate of the phase difference derived from said second means with respect to a reference value the reference value being associated with the distance measured by said first means and being set according to the radius of curvature of the traffic lane determined by said third means; and (e) fifth means for detecting and controlling the vehicle speed so as to follow the moving object on the same traffic lane at a predetermined safe intervehicle distance to the moving object on the basis of the detected vehicle speed and distance detected by said first means when said fourth means determines that the moving object is moving on the same traffic lane.