Emergency terminal deceleration in elevator systems
AssigneeOtis Elevator Company
InventorUwe Schönauer
Life of this patent
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Abstract
A method of controlling a moving component (22, 24) approaching a buffer (42, 46) in a hoistway (34) of an elevator system (20) is provided. The method includes: a) calculating, based on a current velocity of the moving component (22, 24), a required braking distance to decelerate the moving component (22, 24) to a maximum buffer impact velocity; b) comparing the required braking distance to a current buffer distance between the moving component (22, 24) and the buffer (42, 46) to give a comparison result; c) repeating steps a) and b) one or more times; and d) triggering an emergency stop of the moving component (22, 24) based on the comparison result.
Claims15
A method of controlling a moving component (22, 24) approaching a buffer (42, 46) in a hoistway (34) of an elevator system (20), the method comprising:
- a) calculating, based on a current velocity of the moving component (22, 24), a required braking distance to decelerate the moving component (22, 24) to a maximum buffer impact velocity;
- b) comparing the required braking distance to a current buffer distance between the moving component (22, 24) and the buffer (42, 46) to give a comparison result;
- c) repeating steps a) and b) one or more times;
- and
- d) triggering an emergency stop of the moving component (22, 24) based on the comparison result.
An elevator system (20) comprising:
- a moving component (22, 24) arranged to move along a hoistway (34);
- a buffer (42, 46) located in the hoistway (34) to limit the movement of the moving component (22, 24);
- and
- a controller configured to:
- a) calculate, based on a current velocity of the moving component (22, 24), a required braking distance to decelerate the moving component (22, 24) to a maximum buffer impact velocity;
- b) compare the required braking distance to a current buffer distance between the moving component (22, 24) and the buffer (42, 46) to give a comparison result;
- c) repeat steps a) and b) one or more times;
- and
- d) trigger an emergency stop of the moving component (22, 24) based on the comparison result.
Dependencies are inferred from the claim text.