Relative system response elevator call assignments

An elevator system including a group of elevators for servicing a plurality of floor landings in a building, comprising:

• group controller means, including hall call means for registering calls for up and down service at each of said landings, for exchanging signals with each of said elevators, and for controlling the operation of said elevators in response to said hall call means and signals received from said elevators;
• each of said elevators including a car, car motion means for providing and arresting the motion of said car, means registering car calls for service required by passengers therein, and a car controller means for providing signals indicative of conditions of said car, for controlling said car motion means to cause said car to move in a selected up or down direction and to stop in response to said signals indicative of conditions of said car and to signals received from said group controller means;
• characterized by said group controller means comprising signal processing means responsive to said signals indicative of conditions of each of said cars for providing, for each car, with respect to each hall call registered, a signal representing the summation of relative system response factors, indicative of the relative degree to which the assigning of any hall call to said car is in accordance with a scheme of system response applicable to all of said cars, a first plurality of said relative system response factors registered being unrelated to the floor landing or direction of the hall call and a second plurality of said relative system response factors being indicative of service to be performed by each car in reaching the floor of the registered hall call, said relative system response factors being weighted with respect to one another to represent a reasonable increase in time expected for said group of elevators to answer a specific hall call in contrast with favoring another aspect of said scheme of system response identified with a respective one of said relative system response factors, and for assigning each registered hall call to the car provided with the lowest summation of relative system response factors with respect to such hall call for service to such hall call.