Patent Application
20140009281
The present invention relates to an alarm triggering device for a security system (fire detection, intruder detection, detection of operational malfunctions in technical facilities, etc.); and to a security system (fire detection, intruder detection, detection of operational malfunctions in technical facilities, etc.) It applies in particular to fire or intruder detection in public or private residential, industrial, commercial and leisure buildings or to the detection of operational malfunctions in technical facilities. In the following, the term “technical alarm” will be used to mean the detection of operational malfunctions in technical facilities and “predefined event” to mean a fire, intrusion or an operational malfunction in technical facilities or similar.
Regarding fire detection, a fire detection system comprises an electronic central monitoring station and a detection network that communicates with the electronic control unit including one or more alarm triggering devices or fire detection points. These alarm triggering devices or detection points may comprise automatic fire detectors able to sense a phenomenon representative of a fire and manual fire detectors (manual triggers), which can be operated by a person discovering a fire situation. Alarm triggering devices are in general distributed in the area or areas to be monitored and connected to the central monitoring station. The electronic control unit makes it possible to monitor the area or areas to be monitored by means of the alarm triggering devices and to broadcast an alarm when a fire is detected.
The alarm triggering devices are connected to the central monitoring station so as to allow information to be exchanged between the control unit and said alarm triggering devices, so that the control unit is kept informed of the status of each element of the detection network and, if applicable, so as to control them.
Fire detection systems are known in which the alarm triggering devices are connected to the control unit by means of a wireless connection. To ensure reliable and safe monitoring, a high-quality link between each alarm triggering device and the control unit is important so as to enable information exchanges. However, the quality of the link can be degraded, for example, because of the presence of obstacles in the radio communication path between said alarm triggering device and the control unit.
A radio communications fault can be very dangerous when a fire breaks out, since the alarm triggering device would be unable to communicate with the central monitoring station to signal that the alarm has been triggered and the presence of a fire.
Positioning the triggering devices in relation to the central monitoring station is a very important factor to ensure a high quality wireless connection between the two elements. Such positioning, carried out during the installation of the fire detection system, is complicated to achieve as it requires the quality of the wireless communications with the control unit to be checked. This is a cause of wasted time, significant costs overruns and risks of badly-realized installations.
The same drawbacks as those described above can also be found when an intrusion detection system or an operational malfunction detection system for technical facilities is under consideration.
The present invention aims to remedy all or part of the drawbacks described above.
To this end, according to a first aspect, the present invention envisages an alarm triggering device for a security system, the alarm triggering device comprising: an interface arranged so as to connect the alarm triggering device to a security system control device (frequently known as control unit or central monitoring station) by means of a wireless connection; triggering means to trigger an alarm if a predefined event occurs; means of checking the quality of the wireless connection to verify, during an installation step of the alarm triggering device, the quality of the wireless connection between said alarm triggering device and the management device; and signaling means to signal an indication of the quality of the wireless connection between said alarm triggering device and the management device during the installation step of said alarm triggering device.
According to an embodiment, the verification means are arranged so as to measure a parameter representative of the reception quality of a predefined radio verification signal coming from said management device.
According to an embodiment, the verification means are arranged to measure the signal-to-noise ratio or the intensity of the predefined radio verification signal. Hereinafter, “intensity” will mean any parameter representative of the quality of information transmission by the radio link, such as the signal's amplitude or phase or frequency modulation, for example.
In the following, the expression “quality of the link to the alarm triggering device” will refer to the relative value of the signal-to-noise ratio or of the intensity of the predefined radio verification signal received from the management device in relation to a reference value.
Similarly, in the following, the expression “quality of the link to the management device” will refer to the relative value of the signal-to-noise ratio or of the intensity of a predefined radio verification signal received from the alarm triggering device in relation to a reference value.
Lastly, in the following, the expression “quality of the radio link” will refer either to the relative value of the signal-to-noise ratio or of the intensity of a predefined radio verification signal received from the alarm triggering device or from the management device in relation to a reference value.
According to an embodiment, the signaling means are arranged so as to generate different signals depending on the reception quality of the predefined verification signal.
According to an embodiment, the signaling means are arranged so as to emit a sound signal whose frequency or volume varies depending on the quality of the link towards the alarm triggering device.
According to an embodiment, the signaling means are arranged so as to emit a light signal whose color or intensity varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the signaling means are arranged so as to emit a blinking light signal whose blink frequency varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the signaling means are arranged so as to emit a sound signal in the form of impulses whose impulse repeat frequency varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the impulse repeat frequency increases depending on the increase in quality of the link to the alarm triggering device.
According to an embodiment, the verification means are arranged so as to emit a test radio signal towards the management device; wait for a predefined period of time for a response radio signal from the management device; and measure the intensity or the signal-to-noise ratio of the response radio signal, if the response signal is received.
According to an embodiment, the device may also comprise emission means to emit a predefined verification radio signal to the management device to allow the management device to check the quality of the wireless connection between the management device and the triggering device during the installation step of the triggering device.
A second aspect of the invention envisages a security system comprising a management device able to communicate with at least one alarm triggering device such as that described above.
A third aspect of the invention envisages an installation method for at least one alarm triggering device of a security system in an area to be monitored, with the security system comprising a management device able to communicate with the triggering device by means of a wireless link, with the method comprising the following steps:
According to an embodiment, the verification step comprises a step of measuring a parameter representative of a predefined radio verification signal coming from said management device.
According to an embodiment, the verification step comprises a step of measuring the signal-to-noise ratio or the intensity of the predefined radio verification signal.
According to an embodiment, the signaling step comprises generating different signals depending on the reception quality of the predefined verification signal.
According to an embodiment, the signaling step comprises emitting a sound signal whose frequency or volume varies depending on the quality of the link to the management device.
According to an embodiment, the signaling step comprises emitting a light signal whose color or intensity varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the signaling step comprises emitting a blinking light signal whose blink frequency varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the signaling step comprises emitting a sound signal in the form of impulses whose impulse repeat frequency varies depending on the quality of the link to the alarm triggering device.
According to an embodiment, the impulse repeat frequency increases depending on the increase in quality of the link to the alarm triggering device.
According to an embodiment, the verification step comprises
According to another aspect, the present invention envisages an alarm triggering device for a security system, the alarm triggering device comprising: an interface arranged so as to connect the alarm triggering device to a security system control device (frequently known as control unit or central monitoring station) by means of a wireless connection; a trigger to trigger an alarm if a predefined event occurs; a verification unit configured to check the quality of the wireless connection to verify, during a step of installing the alarm triggering device, the quality of the wireless connection between said alarm triggering device and the management device; and a signaling module to signal an indication of the quality of the wireless connection between said alarm triggering device and the management device during the installation step of said alarm triggering device.
Another aspect of the present invention proposes a computer program for implementing at least part of the corresponding method described previously. Such a program may be downloadable from a telecommunications network and/or stored in a memory of a processing device and/or stored on a memory medium designed to cooperate with a processing device.
In the following, descriptions are provided for a few preferred embodiments of the invention with reference to the figures in an appendix hereto, in non-limiting fashion, of course.
A security system 10 according to a first mode of the invention is represented schematically in
In the embodiment illustrated in
The central monitoring station 100 is configured, in a way known per se, to be able to detect the occurrence of an alarm from any one of the alarm triggering devices 200-1 . . . 200-n, signal the alarm condition by visual and/or audible means and to control said alarm triggering devices 200-1 . . . 200-n. The communications means 104 comprise a wireless interface including a device to receive and transmit radio signals, fitted with an antenna to allow the control unit to communicate with the alarm triggering devices 200-1 . . . 200-n by means of the wireless connections 50-1 . . . 50-n.
The housing 110 can be fitted, in a way known per se, with means enabling a connection towards central monitoring and control means, via a telephone line, the Internet or other means.
The display screen 116 allows the processor to display visual messages aimed at a user of the central monitoring station 100 and/or at a member of the maintenance team for this device. In particular, the display screen 116 is designed to display an alarm indication and/or an indication of the status of a wireless connection 50 between the central monitoring station 100 and one or more triggering devices 200.
In some embodiments, information concerning the verification signal's reception quality may be displayed on the signaling board 116 of the central monitoring station 100.
The alarm triggering devices 200-1 . . . 200-n include automatic triggers comprising predefined event detectors and manual triggers. The automatic predefined event detectors are able to sense a phenomenon representative of a predefined event, e.g. for a fire, smoke or flames. These detectors can be configured to detect a variation in a physical or chemical dimension, for example, in a non-limiting way, a temperature, a presence of smoke particles or a composition of the air and when this variation matches predefined criteria, e.g. amplitude, derivative or second derivative, said detector transmits a signal representative of a predefined event's detection to the central monitoring station 100 by means of the wireless connections 50-i. The automatic triggers trigger an alarm in response to the detection of a phenomenon representative of a predefined event. The manual triggers can be operated manually by a person discovering a predefined event situation, e.g. a fire. In response to the triggering, an alarm signal is transmitted to the central monitoring station 100. In some embodiments of the invention, an alarm signal can be signaled at the location of the alarm triggering device.
An alarm triggering device 200 for the security system, according to a first embodiment of the invention, is represented schematically in
The verification means 240 are connected to the wireless interface 210. They are configured so as to verify the quality of a wireless connection 50-i between the central monitoring station 100 and the manual trigger 200-i during the latter's installation within the area to be monitored 500. To this end, the verification means 240 can be configured so as to measure the intensity of the radio signal received from the central monitoring station 100 through the wireless interface 50-i and to compare the measured intensity with a predefined intensity threshold. The verification means 240 can be configured so as to measure, as an alternative or in addition, the signal-to-noise ratio of the radio signal received from the central monitoring station 100 through the wireless interface 210 and to compare the measured signal-to-noise ratio to a predefined signal-to-noise ratio threshold.
In a particular embodiment, the verification means 240 can be configured so as to send a test signal to the central monitoring station 100 during the installation of the manual trigger and to wait for a response signal coming from the central monitoring station 100 so as to verify the wireless connection 50. The intensity and/or the signal-to-noise ratio of the response signal coming from the central monitoring station 100 can then be measured to determine the quality of the wireless connection 50-i between the central monitoring station 100 and the triggering device 200-i. When weak intensity and/or a weak signal-to-noise ratio is detected, the trigger device 200-i can be moved to another location within the area to be monitored so as to improve the quality of the wireless connection 50-i. The absence of a response signal from the central monitoring station 100 may indicate the absence of wireless communications. In this case, the trigger device 200-i can be moved within the area to be monitored so as to find a location that allows improved wireless communications between the two devices.
In this embodiment, the signaling means 250 are configured so as to generate different signals depending on the reception quality of the verification or response radio signal coming from the central monitoring station 100. For example, the signaling means 250 can be configured to manage the light emissions of a connection indicator 214 such that the color of the power supply indicator varies depending on the intensity or the signal-to-noise ratio of the verification or response signal received from the central monitoring station.
In variants, the brightness of the light from the indicator 214 can vary depending on the intensity or the signal-to-noise ratio of the verification or response signal received. In other variants, the signaling means 250 can be configured to manage the indicator's blink frequency depending on the intensity or the signal-to-noise ratio of the verification or response signal received. In an embodiment, the indicator can comprise several emission elements and the number of emission elements lit can vary depending on the intensity or the signal-to-noise ratio of the verification or response signal received.
In other variants, the signaling means 250 can generate a sound signal whose volume or frequency varies depending on the intensity or the signal-to-noise ratio of the verification or response signal received.
Different sounds can be emitted depending on the quality of the wireless connection 50 or the emission frequency of these sounds can vary depending on the quality of the wireless connection 50 or these sounds can be emitted in the form of impulses at repeat frequencies that depend on the quality of the wireless connection 50. In a particular embodiment, the repeat frequency increases depending on the improvement in the quality of the wireless connection. In another embodiment, the repeat frequency decreases depending on the improvement in the quality of the wireless connection.
It should be noted that the device described above makes it possible to facilitate the installation of the triggering devices. Effectively, once the control unit has been installed, it is possible to place the triggering devices in positions such that the signaling means are not in a malfunction alarm condition. For example, if they are arranged so as to emit a sound signal in the form of impulses at repeat frequencies that get correspondingly lower as the radio link's quality decreases, then the person installing the triggering device has a directly perceptible piece of information. It would, of course, be possible to emit impulses at repeat frequencies that get correspondingly higher as the radio link's quality decreases.
With reference to
The ability to test the wireless connection at the time of installation makes it possible to optimize the positioning of each triggering device within the area to be monitored. Consequently, the installer of the trigger device is informed of the quality of the wireless connection at the time of the installation.
Obviously and as is demonstrated moreover in the preceding description, the invention is in no way limited to these two modes of application and embodiments that were more specifically envisaged; on the contrary, it encompasses all the variants without in any way departing from the scope of the invention, such as it is defined by the claims.
For example, in variants, the central monitoring station may comprise means of checking the quality of the wireless connection to verify, during the installation step, the quality of the wireless connection between said triggering device and the central monitoring station; and signaling means to signal an indication of the quality of the wireless connection to the management device, i.e. between said alarm triggering device and the central monitoring station 100. In this way, the quality of the connection can be checked in both directions. The central monitoring station can thus send, to the alarm triggering device, a specific message relating to the quality of the wireless connection to the management device. When the alarm trigger device receives this message, the signaling means 103 can be activated to emit a visual or sound signal.
In addition, even though the embodiments were described in relation to positioning a manual trigger, it will be readily understood that, in other embodiments, the positioning of the automatic fire detectors or of other types of alarm triggering devices can be checked.
| Number | Date | Country | Kind |
|---|---|---|---|
| 11/00947 | Mar 2011 | FR | national |
This is the 35 USC 371 national stage application of PCT/FR2012/000113 filed Mar. 29, 2012, which claims priority from French Patent Application No. 11 00947 filed Mar. 31, 2011, each of which is herein incorporated by reference in its entirety.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/FR12/00113 | 3/29/2012 | WO | 00 | 9/26/2013 |
