Integral gain elevator door motion control
US4305480A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1979 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | Dec 27, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An elevator system includes a microprocessor-based cab controller mounted directly on an elevator car, which controls elevator door motion in response to a velocity error indicative of the difference between the actual elevator door velocity and a desired dictated door velocity in accordance with a velocity profile. The door motor is driven in response to signals generated as a function of the velocity error, both with proportional gain and with integral gain. However, the integral gain component of the motion command signal is set to zero if the velocity error changes the sign of its polarity, which is indicative of overcompensation. Similarly, if the velocity error is below some acceptable magnitude, no integral gain is provided. An exemplary elevator system, an exemplary microprocessor-based controller, and logic flowcharts for an overall door control program, illustrative of an environment of the invention, as well as details of the invention, are disclosed herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.