Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1979-12-27
1981-12-15
Rubinson, Gene Z.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 31, 318266, B66B 1308
Patent
active
043054803
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.
REFERENCES:
patent: 3376486 (1968-04-01), Caputo
patent: 3627080 (1971-12-01), Yuminaka et al.
patent: 3673482 (1972-06-01), Davey
patent: 3729668 (1973-04-01), Brette
Duncanson Jr. W. E.
Otis Elevator Company
Rubinson Gene Z.
Williams M. P.
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