Elevator speed dictation system
US5035301A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1989 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Jul 3, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B1/285
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to an elevator speed dictation system for use in controlling the acceleration and deceleration of an elevator. During the acceleration phase, the speed dictation system of the present invention calculates a dictated acceleration value and a dictated velocity value, as well as a position value representative of where the elevator should be, based on the dictated acceleration and velocity values. The system provides a table for storing values of acceleration, velocity and position based on the dictated velocity values. The stored values of acceleration and velocity are used by the system for decelerating the elevator, with position being the index into the table. Since acceleration values are available from the table, system computation time, otherwise required for calculating acceleration from velocity, is saved. The system begins to decelerate the elevator upon the issuance of a stop control command (SCC). The present invention employs, inter alia, a distance error calculation in determining the SCC. The distance error calculation is based on the dictated position value and the actual distance traveled by the elevator. In this way, the distance err…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.