Dynamic selection of elevator call assignment scan direction
US4875554A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1988 |
| Grant date | Oct 24, 1989 |
| Priority date | — |
| Expiry date | Aug 31, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B2201/226
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method of assigning hall calls to a plurality of elevator cars (0, 1, N) which biases the assignment process to balance the number of cars serving up and down service directions. Prior to each call assignment update the method determines the number of cars serving each service direction (78, 80, 82). A predetermined relationship (88) between there two numbers is used to determine if up hall calls should be assigned first, or down hall calls (90, 92, 94, 96). The balancing of cars serving the two service directions lowers the average waiting time, and it results in dispersing the cars throughout a building when service subsides, to enable prompt service for newly entered calls without the necessity of moving the cars during periods of low service to be in position for new calls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.