Abstract: A method of generating a landing speed pattern which starts with the dynamics of the actual elevator system and the desired actual landing velocity profile curve, and generates a landing speed pattern which will produce the desired actual landing velocity characteristic. In a preferred embodiment, the actual desired landing velocity is a function of time squared, defining a parabolic profile. The apparatus includes arrangements for implementing a predetermined speed pattern equation in response to the distance-to-go count (DTG) of predetermined standard increments to the target floor.

Abstract: An elevator system in which distance pulses are generated in response to travel of an elevator car, and used to update a car position counter. The difference between the car position count and a count representative of the location of the target floor is determined when the elevator car reaches a predetermined distance from the target floor, and this distance-to-go (DTG) count is used to provide a speed pattern for decelerating and landing the car at floor level. A zone of fixed length is provided on each side of each floor, and, when this zone is detected, the DTG count is compared with a count representative of this fixed length. If they differ within a predetermined tolerance, it is known that a proper landing will or can be made, and the DTG count is changed to the correct value at the instant the zone is detected. Door preopening may be enabled at this time. If the difference exceeds the predetermined tolerance, no corrective action is taken, and door preopening is not enabled.

Abstract: An elevator system in which indicia in the hatchway to signal elevator car slowdown points for the floors of a building are also used to maintain and update the advanced car position. The advanced car position is changed to the next floor in the car's travel direction at the start of a run, and then each slowdown indicia encountered by the car associated with the car travel direction changes the advanced car position until the slowdown indicia is detected which is associated with the floor at which the elevator car is to stop.