METHOD AND AN ELEVATOR FOR STOPPING AN ELEVATOR CAR USING ELEVATOR DRIVE
First Claim
1. A method, comprising:
- determining, by a safety controller, at least one of a speed limit and an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least one of the elevator car is being driven, the elevator car is within a predefined distance from a destination floor, the elevator car is in a floor, and an attempt to apply at least one brake has been made;
detecting a need to perform braking of the elevator car, the need being due to at least one of the elevator car being within a predefined distance from a destination floor, an exceeding of the speed limit and an exceeding of the acceleration limit;
disabling power supply to the motor, in response to the detecting of the need to perform braking;
attempting to apply the at least one brake for braking movement of the elevator car, in response to the detecting of the need to perform braking;
measuring at least one of speed and acceleration of the elevator car using at least one first sensor, in response to the attempt to apply the at least one brake and the disabling of the power supply to the motor;
determining whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit; and
enabling, by the safety controller, power supply to the motor for stabilizing movement of the elevator car, in response to the exceeding of the respective at least one of the speed limit and the acceleration limit.
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Accused Products
Abstract
The invention relates to a method and an apparatus. In the method there is determined a speed limit or an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least information on whether the elevator car is being driven or whether the elevator car is in a floor. Power supply to the motor is disabled and brakes are applying for braking movement of the elevator car. Speed or acceleration of the elevator car is measured, in response to the applying of the at least one brake and the disabling of the power supply to the motor. It is determined whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit. Thereupon, power supply to the motor is enabled for stabilizing movement of the elevator car.
23 Citations
17 Claims
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1. A method, comprising:
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determining, by a safety controller, at least one of a speed limit and an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least one of the elevator car is being driven, the elevator car is within a predefined distance from a destination floor, the elevator car is in a floor, and an attempt to apply at least one brake has been made; detecting a need to perform braking of the elevator car, the need being due to at least one of the elevator car being within a predefined distance from a destination floor, an exceeding of the speed limit and an exceeding of the acceleration limit; disabling power supply to the motor, in response to the detecting of the need to perform braking; attempting to apply the at least one brake for braking movement of the elevator car, in response to the detecting of the need to perform braking; measuring at least one of speed and acceleration of the elevator car using at least one first sensor, in response to the attempt to apply the at least one brake and the disabling of the power supply to the motor; determining whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit; and enabling, by the safety controller, power supply to the motor for stabilizing movement of the elevator car, in response to the exceeding of the respective at least one of the speed limit and the acceleration limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A safety apparatus for an elevator, the safety apparatus comprising:
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a safety controller further comprising a first message bus, at least one sensor interface connected to the first message bus and at least one sensor in the elevator, and at least one processor connected to the first message bus, the at least one processor being configured to determine at least one of a speed limit and an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least one of the elevator car is being driven, the elevator car being within a predefined distance from a destination floor, the elevator car being in a floor, and an attempt to apply at least one brake being made, to detect a need to perform braking of the elevator car, the need being due to at least one of the elevator car being within a predefined distance from a destination floor, an exceeding of the speed limit and an exceeding of the acceleration limit, to disable power supply to the motor, in response to the detecting of the need to perform braking, to attempt to apply the at least one brake for braking movement of the elevator car, in response to the detecting of the need to perform braking, to measure at least one of speed and acceleration of the elevator car using at least one first sensor, in response to the attempt to apply the at least one brake and the disabling of the power supply to the motor, to determine whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit, and to enable power supply to the motor for stabilizing movement of the elevator car, in response to the exceeding of the respective at least one of the speed limit and the acceleration limit.
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16. A computer program comprising code adapted to cause the following when executed on a data-processing system:
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determining at least one of a speed limit and an acceleration limit for an elevator car based on elevator state information, the elevator state information comprising at least one of the elevator car is being driven, the elevator car is within a predefined distance from a destination floor, the elevator car is in a floor, and an attempt to apply at least one brake has been made; detecting a need to perform braking of the elevator car, the need being due to at least one of the elevator car being within a predefined distance from a destination floor, an exceeding of the speed limit and an exceeding of the acceleration limit; disabling power supply to the motor, in response to the detecting of the need to perform braking; attempting to apply the at least one brake for braking movement of the elevator car, in response to the detecting of the need to perform braking; measuring at least one of speed and acceleration of the elevator car using at least one first sensor, in response to the attempt to apply the at least one brake and the disabling of the power supply to the motor; determining whether the at least one of speed and acceleration of the elevator car exceeds the respective at least one of the speed limit and the acceleration limit; and enabling power supply to the motor for stabilizing movement of the elevator car, in response to the exceeding of the respective at least one of the speed limit and the acceleration limit. - View Dependent Claims (17)
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Specification