Method and system of energy saving control

A system of energy saving control adapted for a vehicle, comprising:

• a detection device, for detecting a total distance between a specific vehicle and another vehicle in front that is referred as the preceding vehicle, the speed of the preceding vehicle and the dynamic information of the specific vehicle;
• and
• an energy saving control device, coupled to the detection device so as to be used for obtaining a safe distance and an energy saving buffer zone according to the total distance between the preceding vehicle and the specific vehicle, the speed of the preceding vehicle and the dynamic information of the specific vehicle, while determining whether the preceding vehicle had entered the energy saving buffer zone, and thus enabling an energy saving control operation to be activated and used for controlling the specific vehicle to enter into a following mode based upon the calculation of the energy saving control operation if the preceding vehicle is in the energy saving buffer zone.