FR2812432A1 - METHOD OF DETECTING AN UNAUTHORIZED ACTION ON A MOTORIZED OCCULTATION ELEMENT - Google Patents

Abstract

The invention concerns a method for detecting an unauthorised action on a motorised shutter element, in particular a roller shutter, kinematically linked to an electric driving motor actuated by a control device, which consists in detecting the occurrence of the torque variation on the shaft of the motor powering the shutter element and in triggering an alarm when a torque variation is detected in the absence of motor powering.

Description

The subject of the present invention is a method for detecting an action

  not authorized on a motorized occultation element, such as a rolling shutter or a tilting door or moving in translation, kinematically linked to an electric drive motor

  activated by a control device.

  The invention also relates to a device for

the implementation of the process.

  From patent FR 2 657 646, a safety device for a rolling shutter is known in which an intrusion attempt is detected by the observation of an uncontrolled movement of the rolling shutter. For the detection to be immediate, this solution requires means for detecting the lifting of the lower bar or load bar of the roller shutter and therefore either detection means arranged at the bottom of the bay obscured by the roller shutter or a mechanical connection. between this load bar and the top of the bay. Patent FR 2 381 364 describes a safety blind in which a manipulation exerted on the fabric is detected by the combined observation of a variation in force applied to the support of the fabric and of a

canvas vibration.

  In document EP 0 969 436, an intrusion attempt is detected by observing an uncontrolled rotation of the disc of an optical encoder

linked to the engine.

  In all these detection devices, an unauthorized action on the occultation element is detected only from the moment when the occultation element moves. It is also known to detect end of travel stops or an obstacle by means sensitive to an overtorque on the motor shaft. Such devices are described in documents DE 196 10 877, EP 0 703

344 and FR 2,780,089.

  The object of the present invention is the speed of detecting an intrusion attempt as soon as an effort is

  exerted on the occulting element, that is to say even before the occulting element is moved.

  The method according to the invention is characterized in that the appearance of the variation of a torque 20 on the shaft of the driving motor of the concealing element is detected and that an alarm is triggered when the variation torque is detected in the absence

power supply.

  Detection takes place even before the item

  occultation is moved significantly.

  This method can be implemented, for example, by a device comprising a torque detector kinematically linked to the motor shaft, a processing logic to which are applied the signal delivered by the torque detector and a signal indicating whether the

motor is powered.

  Torque detection can be done, for example, using a piezoelectric strain gauge or using a micro displacement sensor as described

in patent EP 0 665 416.

  The accompanying drawing shows, by way of example, an embodiment of a device for implementing the invention. Figure 1 shows the block diagram of a device

for controlling a roller shutter.

  Figure 2 shows the part of the

  control of the shutter relating to the invention.

  The control device shown diagrammatically in FIG. 1 comprises a torque detector 1, consisting for example of a micro displacement sensor as described in patent EP 0 665 416, measuring the torsion of a torsion element supporting the motor M, an analog-digital converter 2 converting the signal supplied by the sensor 1 into a digital signal introduced into a ULT (logic processing unit) 3 equipped with a microprocessor, an interface 4 between the ULT 3, on the one hand , and the motor and an alarm 5, on the other hand, and a manual control 6 for raising / lowering. The interface 4 also consists of an analog-digital converter for the introduction of an operating parameter of the

4 2812432

  engine measured on the engine and its introduction into

The ULT 3.

  The ULT 3 contains a main program consisting of the main program represented in FIG. 3 of patent FR 2 780 089 supplemented by the algorithm represented in FIG. 2 of this document. According to this algorithm, the program first operates an intrusion test which consists in testing the simultaneous presence of a variation in torque on the torque detector 1 and the absence of a command on the motor, that is ie the lack of a supply of it. If this test is positive, an alarm is activated. If the test is negative, the main program, of which only the first test and represented in FIG. 2, is continued as

  described in patent FR 2,780,089.

Claims (4)

  1. Method for detecting an unauthorized action on a motorized occultation element kinematically linked to an electric drive motor activated by a control device, characterized in that   detects the appearance of a variation in torque on the shaft of the shading element drive motor and an alarm is triggered when the variation in torque is detected in the absence of motor power .   2. Device for implementing the method according to claim 1, characterized in that it comprises a torque detector (1) kinematically linked to the motor shaft, a processing logic (3) to which are   applied the signal delivered by the torque detector and a signal indicating whether the motor is powered.   3. Device according to claim 2, characterized in that the torque detector comprises a strain gauge. 4. Device according to claim 2, characterized in that the torque detector comprises a sensor micro displacement.