Control of an elevator system

A method for controlling at least one elevator sub-system of an elevator system, the elevator system comprising:

• a plurality of elevator sub-systems, each elevator sub-system comprising at least one elevator car arranged to travel in a loop path comprising a first vertical section and a second vertical section connected to each other with two horizontal sections, wherein the at least one elevator car is configured to travel upwards in the first vertical section of the loop path and downwards in the second vertical section of the loop path,
• the method comprises:
• determining an efficiency of the elevator system, and
• controlling, in accordance with the efficiency of the elevator system, at least one elevator sub-system to serve elevator calls at different zones from at least one other elevator sub-system by dynamically allocating a specific pattern of floors to be serviced by the at least one elevator sub-system based on the determined efficiency of the elevator system, wherein said allocation differs from a floor pattern serviced by the at least one other elevator sub-system,
• wherein the step of determining an efficiency of the elevator system is performed on a zone-by-zone basis by:
• determining at least one value for each of a plurality of zones, each zone including a specific pattern of floors;
• comparing each determined zone-specific value to a corresponding reference value for that zone;
• and
• setting a detection result for each zone indicating an efficiency for that zone based on the comparison,
• wherein the corresponding reference value is a dedicated reference value defined individually for each zone.

A group controller comprising:

• at least one processor;
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the group controller to perform:
• determine an efficiency of the elevator system, and
• control, in accordance with the efficiency of the elevator system, at least one elevator sub-system to serve elevator calls at different zones from at least one other elevator sub-system by dynamically allocating a specific pattern of floors to be serviced by the at least one elevator sub-system based on the determined efficiency of the elevator system, wherein said allocation differs from a floor pattern serviced by the at least one other elevator sub-system,
• wherein the group controller is configured to determine an efficiency of the elevator system on a zone-by-zone basis by:
• determining at least one value for each of a plurality of zones, each zone including a specific pattern of floors;
• comparing each determined zone-specific value to a corresponding reference value for that zone;
• and
• setting a detection result for each zone indicating an efficiency for that zone based on the comparison,
• wherein the corresponding reference value is a dedicated reference value defined individually for each zone.