Vehicle speed control system

Abstract

A vehicle speed control system starts an automatic decelerating operation with a maximum permissible decelerating physical amount 'G', when an electronic control unit determines that a necessary decelerating physical amount for decreasing a vehicle speed 'v' to a target vehicle speed “v” at a curve starting point becomes larger than the maximum permissible decelerating physical amount “G”. The vehicle speed control system terminates the automatic decelerating operation, when required decelerating physical amount by a braking operation during the automatic decelerating operation becomes larger than an actual control decelerating physical amount for the automatic decelerating operation. The electronic control unit calculates the necessary decelerating physical amount “G” based on a distance “d” to the curve starting point and the vehicle speed “v”, in order to re-start an automatic decelerating operation with the decelerating physical amount “G”, when the required decelerating physical amount becomes lower than the decelerating physical amount “G”.