Elevator system

An elevator system for a building having a plurality of landings, comprising:

• a plurality of elevator cars,
• means mounting said plurality of elevator cars for movement relative to the landings,
• up and down hall call registering means for registering calls for elevator service in the up and down directions, respectively, from at least certain of the landings
• means enabling each of said elevator cars to serve calls for elevator service from predetermined landings such that all of the cars are not enabled for the same landings and service directions therefrom,
• means dividing the landings of the structure into sets according to the landings served by the same combinations of cars,
• averaging means providing a building call average responsive to the number of registered up and down hall calls in the building and the number of in-service elevator cars, a building landing average responsive to the number of up and down hall call registering means in the building and the number of in-service elevator cars, a set call average for each at least certain of the sets responsive to the number of registered up and down hall calls in each set and the number of in-service elevator cars enabled to serve each set, and a set landing average for each of the sets responsive to the number of up and down hall call registering means in each set and the number of in-service elevator cars enabled to serve each set,
• and control means for assigning service directions from landings to said elevator cars, said control means making a general assignment for at least certain of said elevator cars which starts at a car and proceeds in a selected direction therefrom, assigning unassigned service directions from landings only to this car until the set call average for the associated set or building call average is reached, at which time only those landings and service directions therefrom which do not have a registered landing call associated therewith are assigned to that car, until the set landing average or building landing average is reached.

An elevator system for a structure having a plurality of landings, comprising:

• a plurality of elevator cars,
• means mounting said plurality of elevator cars for movement relative to the landings,
• up and down hall call registering means for registering calls for elevator service in the up and down directions, respectively, from at least certain of the landings,
• and control means for assigning service directions from landings to said elevator cars, said control means making a general assignment for at least certain of the elevator cars which starts at a car and proceeds in a selected direction therefrom, assigning unassigned service directions from landings to cars which are within a predetermined travel distance from the car, starting in a predetermined first direction from the car, and reversing at the end of the cars travel in this direction if the predetermined travel distance is not met in the first direction.

An elevator system comprising:

• a building having a plurality of floors,
• a plurality of elevator cars mounted for movement relative to at least certain of said floors,
• call means for registering calls for elevator service from at least certain of said floors,
• and control means including first means for periodically providing a first average responsive to the number of calls for elevator service registered on said call means, and second means for periodically assigned service directions from the floors to said elevator cars, with said control means making a general assignment of said service directions which starts at each car and proceeds in a predetermined direction therefrom, and which is subject to said first average, said control means including third means for determining the relative work loads of the elevator cars, with the order in which the cars are selected for assignment of said service directions being responsive to their relative work loads, starting with the car having the smallest work load.

An elevator system for a structure having a plurality of landings, comprising:

• a plurality of elevator cars,
• means mounting said plurality of elevator cars for movement relative to the landings,
• up and down hall call registering means for registering calls for elevator service in the up and down directions, respectively, from at least certain of the landings,
• averaging means providing a first average responsive to the number of registered up and down hall calls in the structure and the number of in-service elevator cars, and a second average responsive to the number of up and down hall call registering means in the structure and the number of in-service elevator cars,
• means providing a predetermined minimum magnitude for comparison with said first average,
• comparison means selecting the predetermined minimum magnitude when the first average is below the predetermined minimum magnitude, and otherwise selecting the first average,
• and control means for assigning service directions from landings to said elevator cars, said control means making a general assignment for at least certain of the elevator cars which starts at a car and proceeds in a selected direction therefrom, assigning unassigning service directions from landings until the second average is met, skipping landings having registered hall calls if the magnitude selected by said comparison means is met before the second average is met.