A control system for double deck elevators that allocates hall calls to the car with the lowest Estimated Time of Arrival (ETA). Traffic must be arranged so that passengers only travel (i) from odd-numbered floors to other odd-numbered floors, and (ii) from even-numbered floors to other even-numbered floors.
In Uppeak mode, “idle” cars are returned to the Home Floor with a parking call which does not open the elevator doors on arrival. This strategy normally improves uppeak traffic handling. Using this algorithm, elevators are loaded one at a time. This encourages people to fill one elevator rather than partially fill two or more elevators.
In Heavy uppeak mode, “idle” cars are returned to the Home Floor with a parking call that opens the elevator doors on arrival. This strategy improves on Uppeak for particularly heavy traffic situations when it is advantageous to load more than one elevator at a time. If this is not the case, the algorithm is normally less efficient than Uppeak.
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