Group control for elevators with immediate allocation of destination calls

An improvement in a group control for elevators having at least two elevator cars for serving a plurality of floors and for the immediate assignment of floor calls of destination, the group control including call registering devices arranged at the floors for entering floor calls for desired floors of destination, a call memory connected to said call registering devices and including a first memory and a second memory where on input of floor calls at a floor, an input floor call representing the entry floor is stored in the first memory and a destination floor call representing the floor of destination is stored in the second memory, load measuring devices provided in the cars, a load table connected to said load measuring devices for storing a number of passengers in the cars, selectors associated with each elevator of the group for indicating in each case the floor of a possible stop, and means for assigning the entered floor calls to the elevators of the elevator group including a computer and comparison device for each elevator wherein the computer calculates at each floor designated by the selector operating costs corresponding to the waiting times of passengers from data specific to the elevator, and wherein at least one assignment memory is provided and the operating costs of all elevators are compared with each other by means of the comparison device and a new floor call is assigned by the entry of an assignment instruction into the assignment memory of the elevator which displays the lowest operating costs, the improvement comprising:

• a cost register for each car connected to the associated computer and the associated comparison device for storing the operating costs for a floor call input floor and the destination floor immediately after the entry of said floor call;
• a door time table for each car connected to the associated computer for storing door opening and closing times which are utilized by the computer in the calculation of the stopping time of the car for the operating costs, wherein said stopping time of each elevator car is calculated by said associated computer by adding the door opening time to the time for which the door is kept open based on the number of the boarding and alighting passengers times a constant time factor per person plus the door closing time;
• a travelling time table for each car connected to the associated computer for storing travelling times between each floor and each other floor in accordance with upward and downward directions of travel, the computer also utilizing said travelling times in the calculation of the operating costs;
• and
• a car position register for each car connected to the associated computer for storing the instantaneous position of the car which the computer utilizes as the basis for access to said travelling time table.