Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes control for power source of drive-means
Patent
1998-12-29
2000-12-26
Salata, Jonathan
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes control for power source of drive-means
187291, B66B 142
Patent
active
061644161
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a procedure and to an apparatus for the deceleration of an elevator.
2. Description of the Related Art
According to various elevator regulations, an elevator must be able to stop at a landing with a certain accuracy. The required tolerance is typically of the order of .+-.5 mm, which is easily attained by modern elevators. However, a greater stopping precision is aimed at, because the stopping accuracy is also regarded as a measure of quality of the elevator. Moreover, the co-operation between certain parts of the elevator equipment, such as the car door and the landing door, is better in an elevator capable of accurate stopping.
The determination of elevator position is implemented using pulse tachometers mounted in conjunction with the machinery and giving pulse counts that are directly proportional to the revolutions performed by the machine. Another device used for the determination of elevator position is a tachometer which produces an analog voltage proportional to the elevator speed and whose output voltage is converted into a pulse train in which the pulse frequency is proportional to the speed and the pulse count to the distance covered by the elevator. However, in both tachometer types, the distance calculated from the pulse count is not quite accurate because the elevator is driven by means of the friction between the elevator ropes and the traction sheave. The distance calculated from the tachometer pulses contains a small error, because there occurs a slight movement of the elevator ropes relative to the traction sheave. Although the error in the calculated distance is not large, usually only a few millimeters, an objective in modern elevator technology is to eliminate even this small error.
Various solutions have been proposed to solve this problem, e.g. by updating the pulse counts representing elevator position at each floor, as is done in U.S. Pat. No. 4,493,399. In some elevators two tachometers, an analog tachometer and a pulse tachometer, are used, together or separately. Another solution used to indicate elevator position is to provide the shaft or car with code reading devices producing accurate position data.
The behavior of an elevator is also controlled by factors relating to passenger comfort, such as e.g. acceleration, deceleration and changes in them, which, though in fact irrelevant to the problem of determining elevator position, impose certain edge conditions regarding elevator control.
SUMMARY OF THE INVENTION
The object of the present invention is to integrate the acceleration and deceleration of an elevator and their changes as well as the calculation of elevator position with the elevator control so as to achieve a good stopping accuracy and a desired level of travelling comfort when the elevator is being stopped at a floor.
When the procedure of the invention is applied, the elevator will have maximal performance characteristics, such as a high stopping accuracy and a comfortable travelling behavior within the framework of given performance parameters, such as acceleration, deceleration and the change in acceleration and deceleration (jerk). The procedure of the invention obviates the need to carry out adjustments of deceleration elements during installation.
According to the solution presented, the required deceleration is determined continuously on the basis of the remaining distance and the elevator is accordingly brought smoothly to the landing. The deceleration is changed continuously towards a point at which, using a calculated jerk, the speed, deceleration and remaining distance become zero.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 presents an elevator environment according to the invention,
FIG. 2 represents correct operation of
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Laine Antti
Pakarinen Arvo
Saarikoski Tapio
Tull Jan
Kone Corporation
Salata Jonathan
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