Method and apparatus for smoothly stopping an elevator car at a

Details Method and apparatus for smoothly stopping an elevator car at a Method and apparatus for smoothly stopping an elevator car at a

1987-07-29

1988-10-11

Shoop, Jr., William M.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 130

Patent

active

047764341

ABSTRACT:
A method and apparatus for smoothly stopping an elevator car at a target floor in an elevator system which utilizes a speed pattern to control car speed via a speed feedback control loop. When the elevator car reaches a predetermined slowdown point relative to a target floor, the speed pattern is changed towards a predetermined minimum non-zero value, with the non-zero value being selected to insure that the car will reach the floor in the event of error in the arrangement used to change the value of the speed pattern. The speed pattern value is then independently forced to a value indicative of zero car speed in response to a detector which detects the actual presence of the elevator car as it reaches a predetermined small dimension from the target floor, to stop the car at floor level, before a holding brake is applied.

REFERENCES:
patent: 4354577 (1982-10-01), Yonemoto
patent: 4501344 (1985-02-01), Uherek et al.

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