Group management control method for elevator system employing traffic flow estimation by fuzzy logic using variable value preferences and decisional priorities

A group management control method for an elevator system, including the steps of collecting information concerning a current traffic flow occurring for each hall call and car of the elevator system, studying the collected traffic flow information, anticipating a traffic flow after a predetermined time based upon the studied information, and judging a specific control mode corresponding to the anticipated traffic flow, wherein the control method comprises:

• an allocation control strategy establishment step for establishing a control strategy for allocating a proper car based upon selectively using one of a strategy evaluating a priority per each evaluation level set by a building manager and a strategy for evaluating a priority per each evaluation level set by a group management expert according to a complexity of an anticipated traffic flow amount;
• a comprehensive evaluation function operation step for operating a comprehensive evaluation function in accordance with the established control strategy for each car when a hall call occurs;
• a possible candidate cars for allocation selection step for selecting predetermined cars for possible allocation to a hall call based upon the comprehensive evaluation function operated at the comprehensive evaluation function operation step;
• a control item value operation step for operating an input value per each control item for each possible allocated candidate car selected at the possible candidate cars for allocation selection step;
• and
• a car allocation decision step for deciding a car among the possible candidate cars for allocation based upon a predetermined estimating rule using the input value per each control item operated at the control item value operation step,
• wherein the possible candidate cars for allocation decided at said possible candidate cars for allocation selection step are cars having proper evaluation values for a maximum hall call waiting time and a getting-on possible traffic flow amount among those elevator cars having a minimum value in their respective comprehensive evaluation functions among the other elevator cars of the system, and
• wherein the car allocation decision step divides the control items into an upper priority group and a lower priority group in order to estimate a possible candidate car allocation, to decide a possible candidate car allocation based upon a predetermined decision rule using a satisfaction level of the upper priority and a satisfaction level of the lower priority, and decides the allocated car based upon the estimated result.