The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1981
Filed:
Dec. 27, 1979
Michael W Hmelovsky, Warehouse Point, CT (US);
Otis Elevator Company, Hartford, CT (US);
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile