Elevator door motion mode control

Details Elevator door motion mode control Elevator door motion mode control

1979-12-27

1981-11-17

Moses, R. L.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318617, B66B 1308

Patent

active

043006639

ABSTRACT:
An elevator door motion control is operative in either of two modes, the first mode being set in the case where door motion begins with the doors fully open and closed and no special conditions, such as initiation, exist. In this mode, door motion is controlled as the difference between door velocity and a dictated velocity in accordance with desired rates of acceleration and deceleration, and desired maximum velocity, acceleration and deceleration. The second mode of operation takes into account initiation at start-up, door reversals, nudging commands, high force conditions created by obstructions, and resumption of door motion following stall, other than when the door is either fully open or closed in stall. In the second mode of operation, the door is commanded by the difference between its present velocity and a dictated velocity which is selected as the lesser of an acceleration to a maximum desired velocity and a function of the distance of the door remaining to a target distance. As an environment for the present invention, an exemplary elevator system and microprocessor-based cab controller mounted directly on the elevator car, a general door control program logic flowchart are disclosed, together with details of the invention.

REFERENCES:
patent: 2363929 (1944-11-01), Banks et al.
patent: 3376486 (1968-04-01), Caputo
patent: 3729668 (1973-04-01), Brette
patent: 4006392 (1977-02-01), Catlett et al.

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