Speed-control system and procedure for controlling the target speed of a speed-control system

摘要

A cruise control system (20) for a motor vehicle and a method for controlling the target speed thereof. The cruise control system controls the engine so as to endeavour to keep the vehicle speed essentially equal to the target speed. The target speed is automatically and temporarily increased f rom a basic value to a modified value when it is established that certain given conditions are fulfilled. The target speed is maintained at the modified value for a given time period or gradually decreased f rom the modif ied value towards the basic value with steps of a given magnitude at given time intervals, the length of said time period or time intervals being established in dependence on an evaluation value representing the degree of hilliness of the latest stretch of road travelled by the vehicle.