EP 0405999 A3 19920715 - "SMART" POSITION TRANSDUCER SYSTEM FOR ELEVATORS
Title (en)
"SMART" POSITION TRANSDUCER SYSTEM FOR ELEVATORS
Publication
Application
Priority
US 37510489 A 19890630
Abstract (en)
[origin: EP0405999A2] An elevator system employing a microprocessor-based group controller communicating with the cars (3, 4) using car position and velocity information provided by a "smart" primary position transducer (SPPT) system to control the motion of the cars and assign them to handle passenger demands. The SPPT includes an input shaft coupled to a primary encoder disk. Coupled to the shaft through gearing are one or more encoder disks performing the function of turns counting, as well as additional functions. Each disk contains multiple tracks, and each of these tracks is sensed by a sensor, or, alternatively, the SPPT may use two independent sensors per track. It is important to have two essentially independent means of performing the key sensing functions. The read heads of the SPPT are divided into primary and secondary sets with each set used to feed an independent processor. Within each set of sensor signals, cross checks are performed to insure the integrity of the system, which would detect a cracked or broken glass disk. In the electronics of the SPPT system primary and secondary position signals are each found by two methods and compared to maximize the likelihood of correct position determination, with one method given priority over the other, depending on the circumstances. Two independent channels for position and velocity information are maintained, using independent parts, except for the input shafts and encoder disks. Exemplary formulae for determining and generating the desired primary and secondary position and velocity information are provided.
IPC 1-7
IPC 8 full level
B66B 1/36 (2006.01); B66B 1/34 (2006.01); B66B 1/52 (2006.01); B66B 3/02 (2006.01); B66B 5/02 (2006.01)
CPC (source: EP)
B66B 1/3492 (2013.01)
Citation (search report)
- [X] GB 2165966 A 19860423 - MITSUBISHI ELECTRIC CORP
- [Y] GB 2005843 A 19790425 - COAL INDUSTRY PATENTS LTD
- [A] FR 2608756 A1 19880624 - STAUBLI SA ETS [FR]
- [AD] US 4041483 A 19770809 - GROFF ALVIN H
- [A] DE 3243956 A1 19840530 - LUMA ELEKTRONIK GMBH [DE]
- [Y] MACHINE DESIGN. vol. 53, no. 8, April 1981, CLEVELAND US pages 204 - 205; JOSEPH BITTAR: 'Electronic Controls Cut Elevator Travel Time and Operating Cost'
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0405999 A2 19910102; EP 0405999 A3 19920715; EP 0405999 B1 19950920; AU 5795990 A 19910103; AU 614233 B2 19910822; DE 69022495 D1 19951026; DE 69022495 T2 19960307; FI 903293 A0 19900629; FI 98621 B 19970415; FI 98621 C 19970725; HK 43896 A 19960322; JP H03166178 A 19910718
DOCDB simple family (application)
EP 90307127 A 19900629; AU 5795990 A 19900628; DE 69022495 T 19900629; FI 903293 A 19900629; HK 43896 A 19960314; JP 17432790 A 19900630