Patent ID: 9187094
Filing Date: 2015-11-17
Classification: B60W

Abstract:
1. A device for controlling a vehicle speed, the device comprising: a digital map unit configured to determine a current location of a vehicle and a curvature of a forward path; a weather information extracting unit configured to extract weather conditions outside the vehicle; a safe speed determining unit configured to determine a safe speed of the vehicle based on the curvature of the forward path and the extracted weather conditions; a vehicle speed sensor configured to measure a travelling speed of the vehicle; an alarm unit configured to notify a warning signal; and a controller configured to control the vehicle speed such that the vehicle is decelerated when the travelling speed of the vehicle is higher than the safe speed, wherein the weather information extracting unit comprises a driver operated sensor configured to detect an operation of a wind shield wiper and an operation of a fog light, wherein the controller is configured to generate the warning signal when the travelling speed of the vehicle is higher than the safe speed, wherein the safe speed determining unit is configured to calculate an allowable lateral acceleration based on the curvature of the forward path, and to determine the safe speed based on the allowable lateral acceleration and the extracted weather conditions, and wherein the safe speed determining unit is configured to calculate the safe speed by reducing the allowable lateral acceleration based on a predetermined weather condition when the weather condition extracting unit judges that it is snowing, raining, foggy, or the forward path is frozen.