VEHICLE SPEED CONTROL SYSTEM AND VEHICLE SPEED CONTROL METHOD OF VEHICLE

摘要

If a condition for finishing speed limit control is satisfied (step 320), a gradient (Gslope) of a slope of the road is estimated based- on a steady component of the longitudinal acceleration (Gx) of the vehicle (step 330), and a correction factor (Kg) is computed based on the slope gradient (Gslope) of the road (step 340), while a target acceleration (Gxat) of the vehicle is computed based on the vehicle speed (V) (step 350). Then, a target vehicle speed (Vat) is computed by adding the target vehicle speed (Vat(n-l)) of the last cycle to the product of the correction factor (Kg), target acceleration (Gxat) and the cycle time (Tc) of the control (step 360), and the braking or driving force of each wheel is controlled so that the vehicle speed (V) becomes equal to the target vehicle speed (Vat). In this manner, a passenger of the vehicle is prevented from feeling uncomfortable about the speed increase after the completion of the vehicle speed limit control.