Patent ID: 8424651

Claim:
A method for controlling a motion of a first car and a second car in a multi-car elevator system, wherein the first car and the second car move independently in an elevator shaft, such that a minimum distance between the first car and the second car is maintained, comprising the steps of: determining a first deceleration curve as a relationship between a position and a velocity of a first car; determining a second deceleration curve as a relationship between a position and a velocity of a second car, such that the first and the second deceleration curves define a safety zone having a width equals or greater than the minimum distance between the first car and the second car; generating a command to move the first car according to the first deceleration curve, if the relationship between the position and the velocity of the first car corresponds to a value on the first deceleration curve; and generating a command to move the second car according to the second deceleration curve, if the relationship between the position and the velocity of the second car corresponds to a value on the second deceleration curve.