Control for the drive of an object movable to and fro between tw

Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel

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Details

318266, E05F 1510

Patent

active

058748199

DESCRIPTION:

BRIEF SUMMARY
This application is a National Stage of International Application PCT/DE95/01364 under 35 U.S.C. .sctn.371, filed Oct. 5, 1995.


BACKGROUND OF THE INVENTION

Drive systems for an object which is movable to and fro between to end positions are known and are preferably associated with electric motor drives. One example of an object movable in the above-described manner is a door leaf that can be moved between its open and closed positions.
From document EP 0 280 854 it is known to realize such a control system where the position detection in the end positions is not definite, but where a reference point within the door leaf travel is taken as a parameter to determine the actual door leaf position from comparing the reference point with a stored pulse number that reproducing the end positions of the object. This is aided by counting pulses from an increment detector associated with the door leaf drive motor. The positions are input in a memory on the installation of the door leaf. Because of the traversing of the reference point, continual checking takes place of the actual state of the door leaf movement, so that a correction is possible for the set value position in the course of each phase of the travel.
According to an embodiment of the above-mentioned patent, monitoring of the movement of a door leaf in both moving directions takes place on the basis of the location of the reference point between the end positions of the door leaf.


SUMMARY OF THE INVENTION

The present invention is aimed at still further simplifying the control system known from the embodiment of the above-mentioned patent, and is adapted to do without the provision of limit switches, and especially of rendering this system adjustable by the user of the door.
Basically, this is effected by the reference point being displaced to the end section of one of the movement phases, namely in a door, for example, to the section of the opening position of the door leaf. The consequence is that, due to the shortness or the omission of a residual travel until reaching the final opening position, the checking of the actual value
ominal value can be limited to one movement cycle--movement from the opening position to the closing position and back to the opening position. Furthermore, specific working parameters occurring when the door leaf moves into the opening position, may be drawn for the definition of the reference point.
To this end, the monitoring of electrical supply parameters--supply current--of the driving motor is particularly suited. These supply parameters are in any event monitored already in terms of overload protection, for example, for accident prevention.
This means that the door leaf, which is moved into the opening position by an electric driving motor, produces an excess current due to encountering a resistance to define the opening position. The excess current leads to the driving motor being cut-off. The reference point which is thereby obtained--excess current threshold--simultaneously marks the opening position and sets a counter, which is fed by an increment detector operated with the movement of the door leaf, to a predetermined value. In the course of the closing movement, this increment detector will advance the counter and compare the output thereof with the output from a memory in which a value, corresponding to the closing position of the door leaf, had been input at the time of the initial operation of the door.
Accordingly, during the initial operation, one will proceed as follows: After installation, the door leaf is moved from the closing position or an intermediate position, into the opening position. In the opening position, the door leaf encounters a resistance in such a manner that an overload condition of the motor occurs. This is evaluated as the reference point for the opening position and as a cut-off signal. Thereafter, the door leaf is moved by hand control--e.g. dead man's operation into the closing position. The pulses which are output on this occasion from an increment detector of the driving unit

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