Group control for elevators with double cars

A group control for elevators with double cars arranged in a common car frame having car call memories and load weigh instruments assigned to the cars, floor call memories, selectors assigned to each elevator of the group, in each case indicating the floor of a possible stopping, and a scanning device showing at least one position for each floor, and including a control device which has a computing device for each elevator for determining operating costs corresponding to the waiting times of passengers with each position of a first scanner of the scanning device, two cost portion memories each storing an operating cost portion of the operating costs, a cost memory storing the operating costs, a comparator for determining the car with the smallest operating costs at each position of a second scanner of the scanning device and an allocation memory whereby an allocation instruction for a present or future floor call is written into the allocation memory of the car having the smallest operating costs, the control device further comprising two memory locations in each of the cost portion memories for each scanner position for storing computed operating cost portions for each individual car of the double car, a comparator circuit connected with the cost portion memories and the cost memory for comparing the operating costs of the two cars of the double car with one another, whereby the smaller operating costs are stored in the cost memory, a reference sign memory connected with the comparator circuit and the selector for storing a reference sign for the car with the smaller operating costs, and wherein at least one of the operating cost portions stored in said cost portion memories is reduced in response to the existence of allocation instructions for unidirectional floor calls of at least two adjacent floors and/or coincidences of car calls and scanner positions of the first scanner.