JP4525849B2 - Fire alarm system - Google Patents

Description

  The present invention relates to a fire alarm system that transmits a radio signal between a plurality of fire alarm devices.

For radio stations used in Japan, the characteristics of radio waves used (RF characteristics) such as occupied frequency bandwidth and adjacent channel leakage power must satisfy the provisions of the Radio Law. In the Radio Law, different standards (communication standards) are defined for each purpose of use. For example, the “specified low-power radio station” defined in Article 6 of the Radio Law Enforcement Regulations uses a telemeter for automatically displaying or recording the measurement results of remote measuring devices using radio waves. , For telecontrol that transmits signals for the purpose of starting, changing or terminating the function of a device at a remote point using radio waves, and transmission of information processed mainly by machines or transmission of processed information "Specified low-power radio station telemeter, telecontrol and data transmission radio equipment standard (Radio Industry Association Standard ARIB STD-T67)" or mainly fire "Small power," which is defined for the wireless facilities of the low power security system that reports theft or other abnormalities or controls associated therewith Curie tee system of the radio station radio equipment standards (Association of Radio Industries and Businesses Standard RCR STD-30) ", and the like.

  On the other hand, as a wireless transmission system provided with the specific low-power radio station, there is a fire alarm system as described in Patent Document 1, for example. As this type of fire alarm system, multiple fire alarms (radio units) installed at multiple locations have been proposed that each have a function to detect a fire and a function to sound an alarm sound. In such a fire alarm system, when one of the fire alarms detects a fire, the fire alarm sounds an alarm sound and informs other fire alarms by a radio signal of the fire detection information (fire detection information). By transmitting, not only the fire alarm device of the fire source but also a plurality of fire alarm devices interlock and sound an alarm sound all at once, so that the occurrence of a fire can be notified quickly and reliably.

JP 2006-343983 A

  By the way, in the above-mentioned fire alarm system, it is preferable to link all of the plurality of fire alarms, but depending on the position of the fire alarm, a fire that cannot receive a radio signal transmitted by the fire alarm that detects the fire There may be an alarm (a hidden terminal that is a fire alarm outside the communication area).

  In order to link all fire alarms without the hidden terminals as described above, not only fire alarms that detect fires, but also fire alarms that receive fire detection information via wireless signals. Can be transmitted as a radio signal (that is, the radio signal is relayed).

By the way, the fire alarm as described above often uses a battery as a power source in order to take advantage of the characteristic of transmitting fire detection information with a radio signal. It is preferable that the power consumption is low so that it can be used without maintenance for a long period of time such as several years.

  However, if the fire alarm relays radio signals as described above, all fire alarms can be linked, but eventually all fire alarms will transmit radio signals. Therefore, power consumption increases as a whole fire alarm system.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire alarm system in which all the fire alarms can be linked and the consumption can be reduced.

In order to solve the above-described problems, the invention of claim 1 is a fire alarm system comprising a plurality of fire alarms, each fire alarm having a fire detection means for detecting the occurrence of a fire and a radio signal. Transmitting means for transmitting, receiving means for receiving radio signals, notifying means for notifying that a fire has been detected by the fire detecting means, and other fire alarms when a fire is detected by the fire detecting means The wireless signal including the notification message for notifying the occurrence of the fire is transmitted from the transmitting means, and the wireless signal including the notification message for notifying the occurrence of the fire transmitted from another fire alarm is received by the receiving means. A fire alarm system comprising a control means for driving a notification means to notify the occurrence of a fire when received, wherein one of the fire alarm devices is a parent device and the remaining fire alarm devices are child devices; vessel The radio signal transmission ranges of all the plurality of slave units are arranged in an overlapping region, and the transmission unit of the master unit includes all the plurality of slave units within the radio signal transmission range, and between the master unit and the slave units. Only perform periodic monitoring by periodically sending and receiving wireless signals, and the control unit of the child unit that detects the fire by the fire detection means causes the interlocking request signal to be transmitted from the transmission means as a wireless signal including the notification message, control means of the parent unit receives the interlock request signal receiving means, to transmit the interlock command signal including the notification message for also driving the informing means in all other slave unit from the transmitting means, the interlocking request The slave control means other than the slave that transmitted the signal causes the notification means to notify the occurrence of the fire not only when the interlock command signal is received by the receiver but also when the interlock request signal is received. To become And features.

  According to the invention of claim 1, since the master unit is arranged in an area where the transmission ranges of the radio signals of all the plurality of slave units overlap, if any slave unit detects a fire occurrence, The interlock request signal including the notification message transmitted by the master unit is reliably received by the master unit, and the master unit receiving the notification message transmits the interlock command signal including the notification message, and the master unit detects a fire occurrence. In this case, an interlock command signal including a notification message is transmitted from the master unit. At this time, since the transmission unit of the master unit includes all the plurality of slave units within the transmission range of the radio signal, a plurality of notification messages are transmitted. Since it can be transmitted to all the slave units, all the fire alarms can be linked without the hidden terminal (fire alarm outside the communication area), and all the slave units and the master unit are notified. message Rather than transmitting the interlock request signal and interlock command signal, the master unit detects that a fire has occurred in the master unit, and if any slave unit detects a fire, the master unit and the master unit Since only two of them transmit the interlocking request signal or interlocking command signal, it is possible to reduce the overall system consumption. Moreover, in the child unit that can communicate with the child unit that has detected the occurrence of the fire by the fire detection means, the notification unit notifies the occurrence of the fire without waiting for the reception of the interlock command signal including the notification message from the parent unit. Can be linked quickly. In addition, even if the master unit is unable to communicate due to a failure, etc., the slave unit that can communicate with the slave unit that has detected the occurrence of a fire can be linked, so it is possible to prevent a situation where it cannot be linked at all. It is possible to reliably notify the slave unit.

In the invention of claim 2, in the invention of claim 1, it has a plurality of slave units, and at least two of the plurality of slave units are arranged in a region where the transmission ranges of the radio signals overlap each other. In addition, the control unit for the two slave units is characterized by causing the notification unit to notify the fire even when the interlock request signal transmitted from the other of the two slave units is received .

According to a third aspect of the present invention, in the first or second aspect of the present invention, the slave unit control means receives the interlock request signal if the receiver receives the interlock command signal prior to the interlock request signal. It is characterized in that the notification means is notified of the occurrence of a fire without waiting.

According to a fourth aspect of the present invention, in any one of the first to third aspects of the invention, the control means of all the fire alarms is such that the fire detection means does not detect the occurrence of the fire and the notification means When generation | occurrence | production is not alert | reported, a receiving means is intermittently started and it is made to receive intermittently.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the slave unit control means detects a fire with the fire detection means of the slave unit, and transmits the interlock from the slave unit transmission means. After transmitting the request signal, if the interlock command signal transmitted from the transmitter of the master unit is received by the receiver of the slave unit, the transmitter of the slave unit stops the transmission of the interlock request signal It is characterized by.

  The present invention eliminates hidden terminals (fire alarms outside the communication area) and allows all fire alarms to be linked. In addition, when a fire is detected by the fire detection means of the master unit, When a fire is detected by the fire detection means of one of the slave units, only two of the slave unit and the master unit transmit a radio signal, so that the overall system consumption can be reduced and interlocking can be achieved. It is possible to prevent a situation where it can be performed quickly and cannot be interlocked at all, and it is possible to reliably notify other slave units.

It is a system configuration figure of the fire alarm system of one embodiment of the present invention. It is an arrangement plan of a main unit and a sub unit in the same fire alarm system. It is a flowchart for operation | movement description of a main | base station. It is a flowchart for operation | movement description of a subunit | mobile_unit. It is a flowchart of a radio wave check.

  As shown in FIGS. 1 and 2, the fire alarm system according to an embodiment of the present invention includes a plurality (five in the illustrated example) of fire alarms TR.

  The fire alarm device TR transmits a radio signal using radio waves as a medium from the antenna 3 and receives a radio signal by the antenna 3, and another fire alarm when a fire detection is notified from the fire detection unit 4. A control unit 1 that transmits a wireless signal (notification signal) including a notification message for notifying the fire detection device TR to the fire alarm device TR other than itself (so-called broadcast transmission); A fire detection unit 4 for notifying the control unit 1 of fire detection when a fire is detected, a notification unit 5 for notifying that the fire detection unit 4 has notified the fire detection to the control unit 1, a dry battery, etc. The battery power supply unit 6 supplies the operation power to each unit using the battery as a power source, and the container (not shown) is installed on the ceiling of the dwelling unit and the like. A unique identification code is assigned to the fire alarm device TR, and the destination of the radio signal and the source fire alarm device TR can be specified by the identification code. Here, after the fire alarm system is installed, an identification code unique to the fire alarm device TR is registered in association with a predetermined identification number. After this registration, the fire alarm is used instead of the identification code. The radio signal may be transmitted / received using a number that can identify the device TR, and in this way, data (telegram) transmitted by the radio signal can be shortened.

  By the way, in the fire alarm system of the present embodiment, one of the five fire alarms TR is used as a master unit and the remaining four fire alarms TR are used as slave units. Therefore, in the following description, among the five fire alarm devices TR, the fire alarm device TR used as a parent device is denoted by reference symbol TR1 as necessary, and the fire alarm device TR used as a child device is denoted by symbol TR2 as necessary. Represented by Moreover, in order to distinguish the fire alarm device TR1 as a parent device TR1, the fire alarm device TR2 as a child device TR2, and further distinguishing a plurality (four in the illustrated example) of child devices TR2 as necessary. It represents with code | symbol TR2A-TR2D as needed.

  The master unit TR1 and the plurality of slave units TR2 are arranged as shown in FIG. That is, all the slave units TR2 exist in the radio signal transmission range (communication area) S1 of the master unit TR1, and the master unit TR1 and the slave unit TR2B exist in the radio signal transmission range S2 (S2A) of the slave unit TR2A. There is a master unit TR1 and a slave unit TR2A in the radio signal transmission range S2 (S2B) of the slave unit TR2B. The radio signal transmission range S2 (S2C) of the slave unit TR2C and the radio signal of the slave unit TR2D Only the parent device TR1 exists in each transmission range S2 (S2D). Therefore, the parent device TR1 can communicate with all the child devices TR2, but the child device TR2A has the parent devices TR1 and TR2B, the child device TR2B has the parent devices TR1 and TR2A, and the child devices TR2C and TR2D have Communication with only the parent device TR1 is possible.

  That is, in the fire alarm system of the present embodiment, the parent device TR1 is arranged in the region A where the transmission ranges S2 of the radio signals of all the plurality of child devices TR2 overlap, and the transmission / reception unit 2 of the parent device TR1 has a plurality of child devices. All the devices TR2 are included in the radio signal transmission range S1.

  The transmission / reception unit 2 transmits / receives a radio signal using radio waves as a medium in accordance with the “specified low-power radio station” defined in Article 6 of the Radio Law Enforcement Regulations. In the present embodiment, the wireless transmission / reception unit 2 constitutes a transmission unit that transmits a radio signal and a reception unit that receives a radio signal.

  The fire sensing unit 4 senses a fire by detecting smoke, heat, flame, etc. generated by the fire, for example. In addition, since the detailed structure of the fire detection part 4 is conventionally well-known, detailed description is abbreviate | omitted.

  The control unit 1 is a control unit that realizes various functions (mainly a fire alarm function, a periodic monitoring function, and a radio wave check function) by executing a program stored in a memory with a microcomputer. However, the contents of the program stored in the memory of the control unit 1 are partially different between the parent device TR1 and the child device TR2 (that is, the control unit 1 has functions common to the parent device TR1 and the child device TR2). Therefore, in the following description, in order to distinguish between the control unit 1 of the parent device TR1 and the control unit 1 of the child device TR2, it is necessary to distinguish between the parent device TR1 and the child device TR2. Accordingly, the control unit 1 of the parent device TR1 is referred to as a parent device side control unit and is represented by reference numeral 1A, and the control unit 1 of the child device TR2 is referred to as a child device side control unit and is represented by reference numeral 1B.

  When the fire detection unit 4 detects the occurrence of a fire, the control unit 1 drives a speaker (not shown) provided in the notification unit 5 to sound a notification sound (alarm sound) at a predetermined cycle (for example, every 4 seconds). In addition to notifying the occurrence of fire, the other fire alarms TR also cause the notification sound of the occurrence of fire to sound, so that the notification signal for notifying the fire detection is transmitted from the transmission / reception unit 2. On the other hand, when the transmission / reception unit 2 receives the notification signal, the control unit 1 drives a speaker included in the notification unit 5 to notify the occurrence of a fire.

  When the transmission / reception unit 2 receives the notification signal, the parent-side control unit 1A determines that all the child units TR other than the child unit TR that transmitted the notification signal (for example, the child that has transmitted the notification signal). In the case of the device TR2A, the notification signal is transmitted from the transmission / reception unit 2 in order to drive the notification unit 5 in all the child units TR2B to TR2D other than the child unit TR2A.

  Here, the transmission range S1 of the radio signal of the parent device TR1 includes all the child devices TR2. However, when the parent device TR1 breaks down and the notification signal is not transmitted from the parent device TR1. Is notified only by the child device TR2 that detects the fire, so the child device TR2 is not only the parent device TR1, but all the child devices TR2 other than itself, that is, all the fire alarm devices TR other than itself. The above notification signal is transmitted (so-called broadcast transmission). Therefore, even when the parent device TR1 is out of order, at least the child device TR2 that has detected a fire and the child device TR2 within the transmission range S2 of the radio signal of the child device TR2 can be notified. it can.

  In the following description, in order to distinguish the notification signal transmitted from the parent device TR1 from the communication signal transmitted from the child device TR2, the notification signal transmitted from the parent device TR1 is used as an interlock command signal as necessary. The communication signal transmitted by the slave unit TR2 is referred to as an interlock request signal.

  When the slave unit control unit 1B receives the interlock command signal at the transmission / reception unit 2, the slave unit control unit 1B notifies the occurrence of a fire by driving a speaker provided in the notification unit 5 to sound a notification sound. Furthermore, when the slave unit control unit 1B receives the interlock command signal by the transmitter / receiver 2, the transmitter / receiver unit 2 transmits a radio signal (response signal) including a response message to the interlock command signal.

Here, “Specified Low Power Radio Station Telemeter, Telecontrol and Data Transmission Radio Equipment Standards (Radio Industry Association Standard ARIB STD-T67)” or “Low Power Security System Radio Station Radio Equipment” In the standard (Radio Industry Association Standard RCR STD-30), etc., a wireless signal can be transmitted continuously (transmission period), and wireless provided between the transmission period and the transmission period. A period during which a signal should not be transmitted (pause period) is defined. For example, in the standard ARIB STD-T67, the transmission period is 40
It is defined that the period of time is 2 seconds or less and the pause period is 2 seconds or more. In the standard RCR STD-30, the transmission period is 3 seconds or less and the pause period is 2 seconds or more. Therefore, the control unit 1 transmits a radio signal during a transmission period that complies with these standards, stops transmission during a pause period, and enables reception (for example, in this embodiment, the transmission period is 2.8). Second and the rest period is 2.5 seconds). That is, when no fire has occurred, each fire alarm device TR performs an intermittent reception operation, so that each fire alarm device TR transmits a radio signal asynchronously.

  Then, when the master unit side control unit 1A transmits the interlock command signal when the fire detection unit 4 detects a fire, it receives the interlock response signal from all the slave units TR2, or the slave unit When the interlock command signal is transmitted by receiving the interlock request signal from TR2, the interlock is transmitted from all the slave units TR2 except the fire source slave unit (that is, the slave unit that transmitted the interlock request signal) TR2. When the response signal is received, the transmission / reception unit 2 transmits a synchronization signal at a constant period. This synchronization signal is a signal that defines a time slot necessary for performing time-division multiplex transmission between the fire alarms TR, and one cycle (cycle) is a time slot having a plurality of (total number of fire alarms TR). It is divided into. When one time slot different from each other is assigned to each fire alarm device TR and a radio signal is transmitted, the control unit 1 of each fire alarm device TR stores and transmits it in the time slot assigned to its own station. By doing so, collision can be avoided. The time slot assignment for the fire alarm device TR may be fixed, but the time slot assignment information may be notified to each child device TR2 by a synchronization signal transmitted from the parent device TR1. Note that a well-known method can be adopted as such a time slot allocation method, and detailed description thereof will be omitted.

  As described above, in the fire alarm system according to the present embodiment, when no fire is detected by any of the fire alarms TR, each fire alarm TR transmits a radio signal asynchronously, and a fire is detected by any of the fire alarms TR. Is detected, the master unit TR1 transmits a synchronization signal having a fixed period, and each slave unit TR2 is assigned to a time slot defined by the synchronization signal, so that a radio signal is time-division multiplexed. As a result, when the frequency of transmitting a wireless signal is low because there is no fire, the wireless signal is transmitted asynchronously to reduce power consumption and extend battery life. When a fire is detected, that is, when the frequency of radio signal transmission is relatively high, radio signals are time-division multiplexed to avoid collisions and reduce information transmission delays. Than is.

  If a fire is not detected by the fire detection unit 4 of the fire alarm device TR or an operation input for stopping the ringing of the notification sound by the notification unit 5 is received, each fire is notified. Notification by the notification unit 5 ends in the alarm device TR. In this case, the parent device side control unit 1A of the parent device TR1 stops the transmission of the synchronization signal, whereby the fire alarm device TR returns to the normal intermittent reception operation (becomes asynchronous).

  In the fire alarm system according to the present embodiment, when a fire is detected by the fire detection unit 4, an operation (fire notification operation) is performed in which the notification unit 5 of each fire alarm TR is interlocked as described above. However, during normal times when no fire is detected, periodic monitoring is performed to detect an abnormality in the fire alarm device TR. In order to perform this periodic monitoring, the parent device side control unit 1A determines a confirmation signal (periodic monitoring) including a confirmation message (periodic monitoring message) for confirming whether or not the child device TR2 is operating normally. Signal) is transmitted from the transmission / reception unit 2 of the parent device TR1 at a predetermined cycle (for example, a 25-hour cycle) (that is, a confirmation signal is periodically transmitted). Then, the parent-side control unit 1A confirms reception of a response signal, which will be described later, in the transmission / reception unit 2 before the response waiting time (for example, 4 hours) elapses after the confirmation signal (periodic confirmation signal) is transmitted. If it is determined that the child device TR2 is normal and all the child devices TR2 are determined to be normal, the parent device side control unit 1A restarts the transmission of the periodic confirmation signal.

  On the other hand, for the child unit TR2 whose reception of the response signal has not been confirmed even after the response waiting time has elapsed, the parent device side control unit 1A again transmits the above-mentioned response from the transmitting / receiving unit 2 when the response waiting time has elapsed. A confirmation signal (first temporary confirmation signal) is transmitted. Then, when the first control unit 1A transmits the confirmation signal and the transmission / reception unit 2 confirms the reception of the response signal before the first extended waiting time (for example, 4 hours) elapses, If it is determined that the child unit TR2 is normal and all the child units TR2 are determined to be normal, the transmission of the periodic confirmation signal is resumed.

  For the child unit TR2 whose reception of the response signal has not been confirmed even after the first extension waiting time has elapsed, the parent unit side control unit 1A again transmits and receives the transmission / reception unit 2 when the first extension waiting time has elapsed. Then, the confirmation signal (second temporary confirmation signal) is transmitted. Then, when the master unit side control unit 1A confirms the reception of the response signal in the transmission / reception unit 2 before the second extended waiting time (for example, 4 hours) elapses after transmitting the confirmation signal, If it is determined that the child unit TR2 is normal and all the child units TR2 are determined to be normal, the transmission of the periodic confirmation signal is resumed.

And the main | base station side control part 1A determines with the subunit | mobile_unit TR2 which was not able to confirm reception of the said response signal abnormal even if the said 2nd extended waiting time passed. When it is determined that there is an abnormality in the child device TR2, the parent device side control unit 1A, for example, rings a speaker provided in the notification unit 5 to notify that the child device TR2 is abnormal. After determining that the child device TR2 is abnormal, the parent device side control unit 1A resumes the transmission of the periodic confirmation signal, but the response signal is obtained from the child device TR2 that has already been determined to be abnormal. Even if not, the first temporary confirmation signal is not transmitted. Such an operation when the child unit is abnormal is canceled when the response signal is obtained from all the child units TR2 determined to be abnormal. Note that the parent device-side control unit 1A causes the transmitter / receiver 2 to transmit a radio signal including an abnormality message to notify that the child device TR2 has an abnormality to the external device (not shown), and the external device uses the child device. You may make it alert | report that there is abnormality in TR2.

  On the other hand, when the slave unit control unit 1B receives the confirmation signal at the transmitter / receiver unit 2 of the slave unit TR2, the slave unit TR2 transmits the response signal including the radio signal including the identification code and the response message unique to the slave unit TR2. It is transmitted from the transceiver unit 2 of the device TR2. Further, after receiving the regular monitoring signal by the transmission / reception unit 2, the slave unit side control unit 1B receives a predetermined time, for example, a time corresponding to one cycle of the predetermined cycle, the response waiting time, and the first extended waiting time. If the regular monitoring signal is not received even after the total time (33 hours in this embodiment) elapses, it is determined that the parent device TR1 is abnormal. Further, after receiving the first temporary confirmation signal by the transmission / reception unit 2, the slave side control unit 1 </ b> B receives a predetermined time, for example, a total time of a time corresponding to one cycle of the predetermined cycle and the response waiting time ( In this embodiment, when the periodic monitoring signal is not received even after 29 hours have elapsed, or after the second temporary confirmation signal is received by the transmission / reception unit 2, a predetermined time, for example, a predetermined period Even when the time corresponding to the period (25 hours in the present embodiment) has elapsed and the periodic confirmation signal is not received, it is determined that the parent device TR1 is abnormal.

  When it is determined that the parent device TR1 is abnormal, the child device side control unit 1B, for example, sounds a speaker provided in the notification unit 5 to notify that the parent device TR1 is abnormal. After determining that the parent device TR1 is abnormal, the child device-side control unit 1B waits for the regular monitoring signal from the parent device TR1. Such operation when the parent device is abnormal is canceled when the regular monitoring signal is obtained from the parent device 1.

  Next, the operation of the fire alarm system of this embodiment will be briefly described with reference to the flowcharts of FIGS.

  Master device TR1 determines whether or not a fire has occurred (step S100), and determines whether or not an interlock request signal has been received from slave device TR2 (step S106). Periodic monitoring is performed when the interlock request signal of the instrument TR2 is not received (step S110). On the other hand, the slave unit TR2 determines whether or not a fire has occurred (step S200), determines whether or not the interlock request signal has been received from another slave unit TR2 (step S206), and determines from the master unit TR1. It is determined whether or not the interlock command signal has been received (step S210), and there is no fire, and both the interlock request signal of the other slave unit TR2 and the interlock command signal of the master unit TR1 are received. If not, regular monitoring is performed (step S213). That is, if no fire has occurred, the parent device TR1 and the child device TR2 perform regular monitoring. In addition, although the said event in this embodiment is generation | occurrence | production of a fire, it can include not only this but an interlocking test (test of whether to operate | move interlockingly at the time of fire detection).

  When a fire occurs within the detection range of the fire detection unit 4 of the parent device TR1 in the state where the regular monitoring is performed as described above, the occurrence of the fire is transmitted from the fire detection unit 4 to the parent device side control unit 1A. The parent device TR1 proceeds from step S100 to step S101, and the notification unit 5 notifies the occurrence of a fire. Furthermore, the parent device TR1 transmits the interlock command signal to all the child devices TR2 (step S102). In step S102, the parent device side control unit 1A of the parent device TR1 continuously transmits radio signals for the number of frames that can be transmitted within the transmission period, and transmits and receives during the idle period (reception period) after the transmission period. Switch unit 2 to the reception state. Here, although the parent device TR1 and the child device TR2 are asynchronously receiving intermittently, if the transmission period of a certain number of times (for example, three times) is repeated, all the child devices TR2 receive the interlock command signal. Can do. Since all the slave units TR2 exist in the transmission range S1 of the master unit TR1, the interlock command signal of the master unit TR1 is received by all the slave units TR2.

  The child unit TR2 that has received the interlock command signal proceeds from step S210 to step S211 to notify the occurrence of fire by the notification unit 5 and shifts from the intermittent reception operation to the continuous reception operation. Further, the slave unit TR2 transmits the interlock response signal at a predetermined timing (step S212).

  After transmitting the interlock command signal in the master unit TR1, the master unit TR1 determines whether or not the interlock response signal has been received from all the slave units TR2 (step S103). If it is determined that the interlock response signals have been received from all the slave units TR2, the master unit TR1 transmits a synchronization signal including time slot allocation information to each slave unit TR2 at a constant cycle (step S104). Thereafter, the radio signal is time-division multiplexed and transmitted between the fire alarm devices TR (between the master device TR1 and the plurality of slave devices TR2 to TR5).

  When a fire is no longer detected by the fire detection unit 4 of the master unit TR1 or when it is notified that an operation input for stopping the ringing of the notification sound by the notification unit 5 is received, each fire alarm The notification by the notification unit 5 ends in the device TR. Further, the master unit side control unit 1A of the master unit TR1 stops the transmission of the synchronization signal, so that the fire alarm device TR returns to the normal intermittent reception operation (steps S105 and S205).

  As described above, when the fire detection unit 4 of the parent device TR1 detects the occurrence of a fire, the interlock command signal is transmitted from the transmission / reception unit 2 of the parent device TR1, and all the children are included in the transmission range S1 of the parent device TR1. Since the device TR2 is included, the interlock command signal transmitted from the parent device TR1 is received by the transmitting / receiving units 2 of all the child devices TR2, and as a result, the notification unit 5 is driven in all the fire alarm devices TR. A fire is reported.

  On the other hand, if a fire occurs within the detection range of the fire detection unit 4 of the child unit TR2 (eg, child unit TR2A), the fire detection unit 4 notifies the child unit side control unit 1B of the occurrence of the fire, and fire The child device (that is, the fire-source child device) TR2A that has detected the process proceeds from step S200 to step S201, and the notification unit 5 notifies the occurrence of a fire. Further, the fire source child device TR2A transmits the interlock request signal to all the fire alarm devices TR other than itself (in this embodiment, the parent device TR1 and the child devices TR2B to TR2D) (step S202). . In step S202, the slave unit side control unit 1B of the slave unit TR2A continuously transmits radio signals for the number of frames that can be transmitted within the transmission period, and transmits and receives during the pause period (reception period) after the transmission period. Switch unit 2 to the reception state. Here, although the master unit TR1 and the slave unit TR2 are asynchronously receiving intermittently, if the transmission period is repeated a certain number of times (for example, three times), the master unit TR1 or the slave unit TR2B in the transmission range S2A The interlock request signal can be received. Note that the slave units TR2C and TR2D do not exist within the transmission range S2A, and therefore cannot receive the interlock request signal.

  The master unit TR1 that has received the interlock request signal proceeds from step S106 to step S107, and the notification unit 5 notifies the occurrence of a fire. The parent device TR1 starts transmitting the interlock command signal to all the child devices TR2 (step S108). Since all the slave units TR2 exist in the radio signal transmission range S1 of the master unit TR1, the interlock command signal is received by all the slave units TR2.

  After transmitting the interlock request signal in step S202, the fire-source unit TR2A waits for reception of the interlock command signal (step S203). When the interlock command signal is received, the process proceeds to step S204, and the interlock request signal is received. The transmission of the signal is stopped and the intermittent reception operation is shifted to the continuous reception operation (step S204).

When the slave unit TR2B receives the interlock request signal from the fire-source slave unit TR2A prior to the interlock command signal, the slave unit TR2B proceeds from step S206 to step S207, and the notification unit 5 notifies the fire occurrence. Then, the intermittent reception operation is shifted to the continuous reception operation, and the reception of the interlock command signal is awaited (step S208). Thereafter, when the interlock command signal is received, the process proceeds from step S208 to step S209, and the slave unit TR2B transmits the interlock response signal at a predetermined timing. If slave unit TR2B receives the interlock command signal of master unit TR1 prior to the interlock request signal of fire source slave unit TR2A, control proceeds from step S210 to steps S211 and S212.

  The slave units TR2C and TR2D receive the interlock command signal from the master unit TR1 without receiving the interlock request signal from the fire-source slave unit TR2A, and thus proceed from step S210 to steps S211 and S212.

  After transmitting the interlock command signal in step S108, the master unit TR1 determines whether or not the interlock response signal has been received from all the slave units TR2 (TR2B to TR2D) other than the fire source slave unit TR2A. This is performed (step S109). When determining that the interlock response signal has been received from all the child devices TR2 other than the fire-source child device TR2A, the parent device TR1 proceeds from step S109 to step S104.

  When a fire is no longer detected by the fire detection unit 4 of the master unit TR1 or when it is notified that an operation input for stopping the ringing of the notification sound by the notification unit 5 is received, each fire alarm The notification by the notification unit 5 ends in the device TR. Further, the master unit side control unit 1A of the master unit TR1 stops the transmission of the synchronization signal, so that the fire alarm device TR returns to the normal intermittent reception operation (steps S105 and S205).

  As described above, when the fire detection unit 4 of any of the child devices TR2 detects the occurrence of a fire, all the fire alarm devices TR2 except the self from the transmitting / receiving unit 2 of the child device (that is, the child device of the fire source) TR2 The interlock request signal is transmitted to the master unit TR1, and the master unit TR1 is arranged in the region A where the transmission ranges S2 of all the slave units TR2 overlap. Therefore, the master unit TR1 receives the master unit TR1. Is received by the transmitting / receiving unit 2. In this case, the interlock command signal is transmitted from the transmission / reception unit 2 of the parent device TR1 to all the child devices TR2, and all the child devices TR2 are included in the transmission range S1 of the parent device TR1. The interlock command signal transmitted from TR1 is received by the transmission / reception units 2 of all the slave units TR2, and as a result, the notification units 5 are driven in all the fire alarm devices TR to notify the occurrence of a fire.

  Furthermore, in the fire alarm system of this embodiment, radio wave check can be performed. This radio wave check is performed in an environment where stable transmission / reception can be performed when the fire alarm device TR is installed or when the installation location is moved, that is, the region A in which the parent device TR1 overlaps the transmission ranges S2 of all the plurality of child devices TR2. And confirming whether all the plurality of slave units TR2 are arranged in the radio signal transmission range S1 of the master unit TR1.

The operation during this radio wave check will be described with reference to the flowchart shown in FIG. When the radio wave check button (not shown) installed on the body is operated, the parent device side control unit 1A confirms whether or not all the child devices TR2 are arranged within the transmission range S1 of the radio signal. A wireless signal (reply request signal) including a reply request message is transmitted from the transmission / reception unit 2 (step S300). Here, the subunit | mobile_unit side control part 1B will transmit the radio signal (reply signal) containing the reply message with respect to a reply request signal from the transmission / reception part 2, if the transmission / reception part 2 receives the said reply request signal, After transmitting the reply request signal, the parent control unit 1A determines whether or not the reply signals have been obtained from all the slaves TR2 (step S301). Here, when the reply signals are obtained from all the slave units TR2, the speaker provided in the notification unit 5 is driven to notify that the radio wave check result is normal (step 302). On the other hand, if there is a slave unit TR2 for which the reply signal cannot be obtained, it is determined whether or not the number of transmissions of the reply request signal exceeds a predetermined number (step S303), and the predetermined number of times must be exceeded. Then, the process returns to step S30 and transmits the reply request signal again. On the other hand, when the number of transmissions of the reply request signal exceeds the predetermined number, the speaker provided in the notification unit 5 is driven to notify that the radio wave check result is abnormal (step S304). In the radio wave check, a received signal strength indication signal (RSSI) that is a direct-current voltage signal that is proportional to the magnitude of the received response signal is not limited to whether or not the response signal is received. It is determined that the reply signal has not been received even when the signal is less than a predetermined threshold (a signal level at which stable transmission and reception is possible).

  As described above, the fire alarm system according to the present embodiment includes the transmission / reception unit 2 that transmits and receives radio signals, the fire detection unit 4 that detects the occurrence of a fire, and the fire detection unit 4 that detects a fire when the fire is detected. A plurality of fire alarm devices TR1 and TR2 including a control unit 1 for transmitting a radio signal including a notification message for notifying occurrence from the transmission / reception unit 2, the fire alarm device TR1 serving as a parent device, and the remaining fire alarm devices TR2 is used as a slave unit. The master unit TR1 is arranged in a region where the transmission ranges of radio signals of all the plurality of slave units TR2 overlap, and the transceiver unit 2 of the master unit TR1 has a plurality of slave units. When all the TR2 is included in the transmission range of the radio signal, the control unit 1 of the parent device TR1 receives the radio signal including the notification message (interlock request signal) by the transmission / reception unit 2, and the radio signal including the notification message (interlock command signal) The It is transmitted from the receiver 2.

  Therefore, according to such a fire alarm system, since the master unit TR1 is arranged in the area A where the transmission ranges S2 of the radio signals of all the plurality of slave units TR2 overlap, the occurrence of a fire is detected in any one of the slave units TR2. In such a case, a radio signal (link request signal) including a notification message transmitted by the slave unit TR2 is reliably received by the master unit TR1, and a radio signal including the notification message is received from the master unit TR1 that has received the notification message. When a signal (linked command signal) is transmitted and a fire occurrence is detected in the parent device TR1, a radio signal (linked command signal) including a notification message is transmitted from the parent device TR1, and at this time, the parent device TR1 Since the transmitter / receiver 2 includes all the plurality of slave units TR2 within the transmission range S1 of the radio signal, the notification message can be transmitted to all the plurality of slave units TR2. In addition, all the fire alarms TR can be linked without the hidden terminal (radio device outside the communication area), and not all the fire alarms TR transmit a radio signal including a notification message. When the occurrence of a fire is detected in the master unit TR1, the master unit TR1 transmits a radio signal. When any one of the slave units TR2 detects the occurrence of a fire, only the slave unit TR2 and the master unit TR1 transmit radio signals. Therefore, the consumption of the entire system can be reduced.

  Further, in the child unit TR2 (the child unit TR2 within the transmission range S2 of the radio signal of the child unit TR2 that detects the occurrence of the fire) that can communicate with the child unit TR2 that has detected the occurrence of the fire, the child unit TR1 Since the notification unit 5 can notify the occurrence of a fire without waiting for the reception of a wireless signal including the notification message (interlock command signal), the interlock can be quickly performed. In addition, even if the parent device TR1 cannot communicate due to a failure or the like, the child device TR2 that can communicate with the child device TR2 that detects the occurrence of a fire can be linked, so that the fire alarm device TR cannot be linked at all. Therefore, it is possible to reliably notify the child unit TR2 from the child unit TR2 that has detected the occurrence of the fire.

The master unit TR1 is arranged in a region where the radio signal transmission ranges S2 of all the plurality of slave units TR2 overlap, and the transceiver unit 2 of the master unit TR1 transmits all the plurality of slave units TR2 to the radio signal transmission range S1. Since the master unit TR1 can transmit confirmation signals to all the slave units TR2, and can receive response signals from all the slave units TR2, all the wireless devices (all Sub unit TR2 and parent unit TR1) Consumption required for periodic monitoring (life and death confirmation) because it is no longer necessary to send a confirmation signal from TR to all other radio units (all sub units TR2 and main unit TR1) TR Electric power can be reduced. Furthermore, since it determines that it is abnormal when the response signal is not obtained even if the confirmation signal is retransmitted a predetermined number of times without determining that the child unit TR2 from which the response signal was not obtained is abnormal immediately, It is possible to suppress erroneous determination such as determining that a failure in transmission / reception of a radio signal is an abnormality of the slave unit TR2, and to improve the reliability of regular monitoring.

  Note that the fire alarm system of this embodiment is merely one embodiment of the present invention, and is not intended to limit the technical scope of the present invention to that of this embodiment, but to the spirit of the present invention. Changes can be made without departing from the scope.

1 Control unit (control means)
2 Transmitter / receiver (transmitter, receiver)
4 Fire detection part (fire detection means)
5 Notification part (notification means)
TR (TR1, TR2) Fire alarm (master unit, slave unit)

Claims (5)

A fire alarm system comprising a plurality of fire alarms,
Each fire alarm has a fire detection means for detecting the occurrence of a fire, a transmission means for transmitting a wireless signal, a reception means for receiving a wireless signal, and a notification for notifying that a fire has been detected by the fire detection means. And a wireless signal including a notification message for notifying other fire alarms of the occurrence of a fire when the fire is detected by the means and the fire detecting means, and transmitted from the other fire alarm In a fire alarm system comprising a control means for driving a notification means to notify the occurrence of a fire when a reception means receives a wireless signal including a notification message for notifying the occurrence of a fire,
Master unit to one of said respective fire alarm, the remaining fire alarm and slave unit,
The master unit is arranged in a region where the transmission ranges of all the plurality of slave units overlap,
The transmission means of the master unit includes all the plurality of slave units within the transmission range of the radio signal,
Periodic monitoring is performed by periodically sending and receiving radio signals between the main unit and the sub unit.
The control unit of the child unit that detects the fire by the fire detection unit causes the transmission request signal to be transmitted from the transmission unit as a radio signal including the notification message,
Control means of the parent unit receives the interlock request signal receiving means, to transmit the interlock command signal including the notification message for also driving the informing means in all other slave unit from the transmission means,
The control means of the slave unit other than the slave unit that transmitted the interlock request signal is not only when the interlock command signal is received by the receiving means, but also when the interlock request signal is received, the notification means generates a fire. A fire alarm system characterized by being informed. A plurality of slave units are provided, and at least two of the plurality of slave units are arranged in a region where the transmission ranges of the radio signals overlap with each other. 2. The fire alarm system according to claim 1 , wherein when the interlock request signal transmitted from the other one of the slave units is received, the notification means is notified of the fire. If the control unit of the slave unit receives the interlock command signal prior to the interlock request signal, the notification unit notifies the occurrence of the fire without waiting for the interlock request signal to be received. The fire alarm system according to claim 1 or 2, characterized by the above. The control means of all the fire alarms is characterized in that when the fire detection means does not detect the occurrence of the fire and the notification means does not notify the occurrence of the fire, the reception means is intermittently activated to receive intermittently. The fire alarm system according to any one of claims 1 to 3. The control unit of the slave unit detects the fire by the fire detection unit of the slave unit and transmits the interlock request signal from the transmitter unit of the slave unit, and then transmits the interlock command transmitted from the transmitter unit of the master unit. The fire alarm system according to any one of claims 1 to 4, wherein when the signal is received by the receiving unit of the slave unit, the transmission unit of the slave unit stops transmission of the interlock request signal.

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