US 12,246,942 B2
Limit-curve control system for elevators
Marcial Lendi, Näfels (CH); and Alex Ackermann, Heiligkreuz (CH)
Assigned to CEDES AG, Landquart (CH)
Filed by Cedes AG, Landquart (CH)
Filed on May 29, 2020, as Appl. No. 16/887,449.
Claims priority of application No. 19 177 688 (EP), filed on May 31, 2019.
Prior Publication US 2020/0377333 A1, Dec. 3, 2020
Int. Cl. B66B 1/40 (2006.01); B66B 5/00 (2006.01)
CPC B66B 1/40 (2013.01) [B66B 5/0031 (2013.01); B66B 5/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for monitoring a speed of an elevator car when an elevator car door is in an unlocked state within an unlocking zone of an elevator shaft, the method comprising:
defining a first speed-limit curve, with a range of values between a first maximum value at an entry to the unlocking zone, and a first minimum value at a predetermined stopping point, having a first switchover event, which corresponds to the elevator car traveling beyond the predetermined stopping point or to a stoppage within the unlocking zone; and
defining a second speed-limit curve, with a range of values between a second maximum value at the predetermined stopping point and one or two second minimum values set at an entry to, and an exit from the unlocking zone, having a second switchover event, which corresponds to a departure signal related to a locking or a closing of the elevator car door,
wherein a speed of the elevator car, when the elevator car door is unlocked, is monitored following entry of the elevator car into the unlocking zone until an occurrence of the first switchover event, when the first speed-limit curve is reached or exceeded, and is monitored following the occurrence of the first switchover event until the occurrence of the second switchover event, when the second speed-limit curve is reached or exceeded, and
wherein, in the event that one of the speed-limit curves is reached or exceeded, an alarm reaction is initiated.