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;
- wherein the emergency stop is triggered in response to the comparison result indicating that the current buffer distance is equal to or less than the required braking distance.
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;
- wherein the emergency stop is triggered in response to the comparison result indicating that the current buffer distance is equal to or less than the required braking distance.
Dependencies are inferred from the claim text.