A safety method and an elevator drive system for an elevator system comprising reduced buffers
The method detects reduced braking forces in elevator systems and adjusts limiting parameters to manage elevator movement, enhancing safety and stability by preventing unsafe conditions.
Patent Information
- Application Number
- HK62026125097
- Authority / Receiving Office
- HK · HK
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-06-22
- Publication Date
- 2026-07-31
AI Technical Summary
Existing elevator systems face challenges in maintaining safety and stability due to reduced braking forces in traction mechanical braking devices, which can lead to unsafe elevator movements.
A method is introduced to detect reduced braking forces and adjust limiting parameters to control elevator movement, coupled with an elevator drive system to ensure safe operation.
Enhances safety and stability by effectively managing elevator movements in response to reduced braking forces, preventing unsafe conditions.
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Abstract
Description
(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202380099887.1 (22) Application Date 2023.06.30 (85) PCT International Application Entering National Phase Date 2025.12.26 (86) PCT International Application Application Data PCT / EP2023 / 067999 2023.06.30 (87) PCT International Application Publication Data WO2025 / 002571 EN 2025.01.02 (71) Applicant KONE AG Address Helsinki, Finland (72) Inventors A. Katainen JM. Etamuto (74) Patent Agency Beijing Liu Shen Law Firm 11105 Patent Attorney Xue Yunran (51) Int.Cl. B66B 5 / 00 (2006.01) (54) Title of Invention: Safety Method and Elevator Drive System for Elevator System Including Reduced Buffer (57) Abstract: This invention relates to a safety method for an elevator system (100) including reduced buffers (118a, 118b). The method includes: detecting (210) a reduced braking force of a traction mechanical braking device, and adjusting (220) at least one limiting parameter that limits elevator movement in response to detecting the reduced braking force, wherein the elevator movement represents the movement of the elevator car (102) of the elevator system (100). The invention also relates to an elevator drive system (122) and an elevator system (100). Claims: 2 pages Description: 7 pages Drawings: 2 pages CN 121399050 A 2026.01.23 CN 1 21 39 90 50 A
Claims
1. A safety method for an elevator system (100) including reduced buffers (118a, 118b), the method comprising: The reduced braking force of the traction mechanical braking device was detected (210), and In response to the detection of the reduced braking force, at least one limiting parameter restricting the elevator movement is adjusted (220), wherein the elevator movement represents the movement of the elevator car (102) of the elevator system (100).
2. The method according to claim 1, wherein, The reduced braking force was detected during the condition monitoring test of the traction mechanical braking device.
3. The method according to any one of the preceding claims, wherein, Detecting reduced braking force includes detecting that the braking force of at least one traction mechanical brake (114a, 114b) of the traction mechanical braking device has decreased to below a predetermined braking force limit.
4. The method according to any one of the preceding claims, wherein, The adjustment (220) of the at least one limiting parameter includes reducing (310) the overspeed limit of the elevator car (102).
5. The method according to claim 4, wherein, The overspeed limit of the elevator car (102) is reduced to the rated impact speed of the buffers (118a, 118b) or to the speed value corresponding to the reduced braking force.
6. The method according to any one of the preceding claims, wherein, The adjustment (220) of the at least one limiting parameter includes reducing (320) the limit value of the Emergency Terminal Speed Limit (ETSL) device of the elevator system (100).
7. The method according to claim 6, wherein, The limit value of the ETSL device is reduced to the rated impact speed of the buffers (118a, 118b) or to the limit value corresponding to the reduced braking force.
8. The method according to any one of the preceding claims, wherein, The adjustment (220) of the at least one limiting parameter includes reducing (330) the maximum speed of the elevator speed curve.
9. The method according to claim 8, wherein, The maximum speed of the elevator speed curve is reduced to the rated impact speed of the buffers (118a, 118b) or to the maximum speed value corresponding to the reduced braking force.
10. An elevator drive system (122) comprising an elevator system (100) including reduced buffers (118a, 118b), the elevator drive system (122) comprising: At least one processor (410); and At least one memory (420), the at least one memory including computer program code (425). The at least one memory (420) and the computer program code (425) are configured to, together with the at least one processor (410), enable the elevator drive system (122) to execute: Detect the reduced braking force of the traction machinery braking device, and In response to the detection of the reduced braking force, at least one limiting parameter restricting the elevator movement is adjusted, wherein the elevator movement represents the movement of the elevator car (102) of the elevator system (100).
11. The elevator drive system (122) according to claim 10, wherein, The reduced braking force was detected during the condition monitoring test of the traction mechanical braking device.
12. The elevator drive system (122) according to any one of claims 10 or 11, wherein, The detection of the reduced braking force includes: the elevator drive system (122) being configured to detect that the braking force of at least one traction mechanical brake (114a, 114b) of the traction mechanical braking device has decreased to below a predetermined braking force limit.
13. The elevator drive system (122) according to any one of claims 10 to 12, wherein, The adjustment of the at least one limiting parameter includes: the elevator drive system (122) being configured to reduce the overspeed limit of the elevator car (102).
14. The elevator drive system (122) according to claim 13, wherein, The overspeed limit of the elevator car (102) is reduced to the rated impact speed of the buffers (118a, 118b) or to a speed value corresponding to the reduced braking force.
15. The elevator drive system (122) according to any one of claims 10 to 14, wherein, The adjustment of the at least one limiting parameter includes: the elevator drive system (122) being configured to reduce the limit value of the emergency terminal speed limit (ETSL) device of the elevator system (100).
16. The elevator drive system (122) according to claim 15, wherein, The limit value of the ETSL device is reduced to the rated impact speed of the buffers (118a, 118b) or to the limit value corresponding to the reduced braking force.
17. The elevator drive system (122) according to any one of claims 10 to 16, wherein the adjustment of said at least one limiting parameter comprises: The elevator drive system (122) is configured to reduce the maximum speed of the elevator speed curve.
18. The elevator drive system (122) according to claim 17, wherein, The maximum speed of the elevator speed curve is reduced to the rated impact speed of the buffers (118a, 118b) or to the maximum speed value corresponding to the reduced braking force.
19. An elevator system (100), comprising: An elevator car (102) is arranged to travel along an elevator shaft (104); A reduced buffer device, comprising reduced buffers (118a, 118b). A traction mechanical braking device, comprising at least two traction mechanical brakes (114a, 114b); and The elevator drive system (122) according to any one of claims 10 to 18.