JP2010129010A - Window opening/closing detecting device - Google Patents

Abstract

An object of the present invention is to reliably detect fraudulent acts caused by mischief using a powerful magnet at the same time as detecting the opening and closing of a window.
A window opening / closing registration processing unit 74 detects a magnetic level Vs by a magnet corresponding to a closed state of a window by a window opening / closing detection hall sensor 46 and performs initial registration, and a predetermined percentage lower than the initially registered magnetic level Vs. A first determination threshold value TH1 and a second determination threshold value TH2 higher than the magnetic force level Vs by a predetermined ratio are registered. The window open / close determination unit 78 determines the magnetic force level when a strong magnet is brought close by mischief or the like by comparison with the second determination threshold in addition to the window open / close determination by comparing the first determination threshold TH1 with the detected magnetic force level. Then, it is assumed that the window is opened and closed and an alarm is given.
[Selection] Figure 6

Description

The present invention relates to a window opening / closing detection device that detects a window opening / closing state and a state in which a strong magnet is brought close by using a magnetic detection element such as a hall sensor.

  2. Description of the Related Art Conventionally, a wireless window opening / closing detection device that detects opening / closing of a window and sends it to a monitoring panel wirelessly as an alarm is known as a monitoring target. In such a window open / close detection device, the magnetic sensing element detects the magnetic force of the magnet placed on the window glass, and when the detected magnetic force decreases, it is determined that the window is open / closed and an abnormality detection signal is transmitted to the alarm panel wirelessly. Alarm. In addition, when the magnetic force of the magnet placed on the open / close lever of the Crescent lock as a monitoring target provided on the window is detected by another magnetic sensing element, and the open / close lever is released and the magnet moves away from the magnetic detection element, the detected magnetic force decreases. Therefore, it is determined that the crescent lock is released, and an abnormality detection signal is wirelessly transmitted to the alarm panel to give an alarm.

  The magnetic sensing elements used in conventional window open / close monitoring devices mainly use reed switches that mechanically turn contacts on and off according to the strength of the magnetic force. In recent years, however, the Hall effect has been used. Therefore, it has been studied to employ a Hall sensor that detects magnetic force.

  When the Hall sensor is used as a magnetic sensing element, the closer the magnet is to the detection target, the stronger the magnetic force passes through the Hall sensor, thereby obtaining a higher sensor output. Window open / closed detection based on the magnetic level detected by the Hall sensor is set to a low value obtained by multiplying the maximum value of the magnetic level detected with the window closed with a predetermined ratio as the determination threshold, and is detected during monitoring. When the magnetic level being reduced falls below the determination threshold value, it is determined that the window is open, and a message indicating that the window is open is sent to the monitoring device to give an alarm.

When the magnetic level increases and exceeds the determination threshold after determining the opening of the window, it is determined that the window is closed, and a message indicating that the window is closed is wirelessly transmitted to the monitoring device to restore the alarm.

JP 2003-281636 A Japanese Patent Laid-Open No. 2001-14990

  However, in a conventional window opening / closing detection device that determines the opening or closing of a window by comparing the magnetic level detected by such a conventional Hall sensor with a predetermined determination threshold, for the magnet installed on the window glass, There is some variation in the strength of the magnetic force, and the magnetic force passing through the Hall sensor differs greatly even if they are arranged at the same distance.

  For this reason, even if an optimum determination threshold is set based on the design parameters, depending on the combination of the magnet and the Hall sensor, the magnetic force level may not reach the determination threshold when the window is closed, and may be erroneously detected as a window open. There is a problem that the quality is not stable.

  In addition, intruders who are familiar with magnet-type window opening / closing detection devices have a strong magnet approached from the outside to prevent the window opening / closing detection device from detecting window opening even if the window is opened. It is expected that the window will be illegally opened, and it is necessary to detect such mischief as a window opening from the magnetic force level detected by the Hall sensor.

The present invention initially registers an appropriate magnetic force level according to the combination of the magnetic sensing element and the magnet, and at the same time detects the opening and closing of the window, so that it is possible to reliably detect fraud by mischief using a powerful magnet. An object is to provide a detection device.

The present invention is a window opening and closing detection device,
A magnetic sensing element for detecting a magnetic force level by a magnet arranged inside the apparatus and arranged on the monitoring object side;
Registration processing for detecting a magnetic level by the magnet corresponding to the closed state of the window and performing initial registration, and registering a first determination threshold value lower than the initially registered magnetic level by a predetermined rate and a second determination threshold value higher than the magnetic force level by a predetermined rate And
A window open / close determination unit that compares the magnetic force level detected by the magnetic sensing element with the first determination threshold or less and the second determination threshold to determine the state of the monitored object;
It is provided with.

Here, the registration processing unit determines the polarity of the magnetic force level of the magnetic sensing element, registers the first determination threshold corresponding to the determined polarity, and registers the second determination threshold corresponding to both polarities,
The window opening / closing determination unit determines the polarity of the magnetic force level detected by the magnetic sensing element,
When the positive polarity is determined, the first determination threshold value and the second determination threshold value of the positive polarity are selected. When opening is determined and the previous time is an opening determination, a window closing is determined when the magnetic force level exceeds the first determination threshold and is less than the second determination threshold,
When the negative polarity is determined, the first and second threshold values of the negative polarity are selected, and when the previous determination is the closing determination, the window opening is determined when the magnetic force level is equal to or higher than the first threshold value or equal to or lower than the second threshold value. When the previous determination is an open determination, the window closing is determined when the magnetic force level is less than the first threshold and greater than the positive second threshold.

  The registration processing unit detects a magnetic force level by a magnet actually used in combination arranged at a predetermined distance in a predetermined measurement environment, and performs initial registration in the nonvolatile memory.

The magnetic detection element is a Hall sensor that outputs a signal of positive polarity or negative polarity according to the direction of magnetic force.

  According to the present invention, the magnetic level by the magnet at the position corresponding to the closed state of the window is detected and initially registered, and in addition to the first determination threshold value lower than the initially registered magnetic level for determining opening / closing of the window, By registering a second determination threshold value that is higher by a predetermined percentage than the initially registered magnetic force level for determining an extremely strong magnetic force level due to mischief that makes it impossible to determine the opening and closing of the window by the first determination threshold value due to the closeness of the magnet It is possible to reliably detect misconduct such as mischief using a powerful magnet as window opening.

  The Hall sensor outputs positive and negative detection signals according to the direction of magnetism, and the magnetic method when the magnet is brought closer by mischief is not determined randomly, but extremely strong magnetic force is generated from either direction. Even if it is added, the polarity is discriminated, and the second determination threshold value of the discriminated polarity is compared with the magnetic force level detected by the Hall sensor, so it is surely strong by mischief regardless of the direction of magnetism applied by mischief. The state where the magnetic force is applied can be determined and alarmed.

  Also, in the inspection process, which is the final stage of manufacturing, the magnetic level is detected by the Hall sensor as the magnetic sensing element in the state where the magnet actually used in combination is arranged at a predetermined distance for detecting the window closing. By registering and obtaining the judgment threshold value from the initially registered magnetic force level, the correct magnetic force level corresponding to the Hall sensor and magnet actually used can be obtained, and the judgment threshold value for judging the opening / closing of the window is set appropriately. A stable device with no detection can be obtained, and the reliability of window monitoring can be improved.

In addition, the Hall sensor output characteristics vary, and at the same time, even if the magnets vary, the magnetic force level in the closed state of the window is detected from the combination of the actually used Hall sensor and magnet, and the initial registration is performed. Therefore, it is possible to absorb the fluctuation in manufacturing the hall sensor and the magnet and to perform initial registration of an appropriate magnetic force level and setting of a determination threshold value.

  FIG. 1 is an explanatory view showing an installation state of a window opening / closing detection device according to the present invention. In FIG. 1, a window opening / closing detection device 10 of the present invention is fixed to a vertical frame of window sashes 12a and 12b to be monitored by double-sided tape or screws.

  On the upper side of the window opening / closing detection device 10, the window sash 12 a, 12 b is closed, and a window opening / closing detection magnet 14 is attached to the opposite position with double-sided tape, and the magnetic force from the window opening / closing detection magnet 14 is incorporated. It is detected by a Hall sensor as a magnetic sensing element.

  When the window sash 12a, 12b is opened, the magnetic force is reduced by the window opening / closing detection magnet 14 being separated from the window opening / closing detection device 10, and a detection signal indicating the opening of the window is detected by detecting the decrease in the magnetic force with a hall sensor. Sent to a monitoring device wirelessly to alert.

  The window opening / closing detection device 10 is arranged so that the lower end thereof is close to the crescent lock 16 as the monitoring object provided on the window sashes 12a, 12b, and the crescent lock detection magnet attached to the opening / closing lever 18 of the crescent lock 16. The magnetic force of 20 is detected by another Hall sensor built in the lower end side.

  The crescent lock 16 locks the window sashes 12a and 12b at an operation position in which the opening / closing lever 18 is rotated in the illustrated vertical direction. At this time, the crescent lock detection magnet 20 is the hall sensor closest to the window opening / closing detection device 10. The magnetic force to be detected is maximized, and the locked state is detected.

  When the crescent lock 16 is unlocked by turning the opening / closing lever 18 downward, the magnetic force is reduced by the separation of the crescent lock detection magnet 20, and a detection signal indicating the unlocked state is detected by detecting the decrease in the magnetic force with a hall sensor. Sends a warning to the monitoring device by radio.

  FIG. 2 is an exploded view showing an embodiment of the window opening / closing detection apparatus according to the present invention. In FIG. 2, the window opening / closing detection device 10 of the present embodiment includes an apparatus main body 22 and a cover member 24.

  The apparatus main body 22 is assembled from the bottom side, a base 30, a metal plate lock cover 32, a body case 36, a circuit board 38 including an antenna 40, and a main body cover 42, and a battery 44 is detachably provided. . A conical magnetic current collector 26 is housed and fixed in the holder member 28 at an end portion of the cover member 24 located on the crescent lock side.

  A sensor board 45 is erected on the upper side of the circuit board 38, and a hall sensor 46 for detecting window opening / closing is disposed here. A crescent lock detecting hall element 48 is provided at the lower end of the circuit board 38.

  FIG. 3 is an explanatory view showing a state where the cover member 24 is removed from the apparatus main body 22 in the window opening / closing detection apparatus 10 according to the present embodiment. On the upper part of the apparatus main body 22, a display unit 56 using red and green two-color LEDs, a registration switch 60 that executes a threshold value registration process for determining the magnetic force detected by the lock detection hall sensor 48, and a cover member A tamper switch 64 for detecting the opening / closing of 24 is provided. The apparatus main body 22 is fitted and fixed in response to the fitting of the cover member 24.

  In addition, a serial port 55 having four terminal pin holes is provided at the center of the upper part of the apparatus main body 22. By connecting an external personal computer to the serial port 55, programs and data can be transferred to and from the built-in processor. It is said.

  The cover member 24 is detachable with respect to the apparatus main body 22, and a display window 56 a is provided at the front center so that the display state of the display unit 56 of the apparatus main body 22 can be seen.

  FIG. 4 is an explanatory diagram showing the relationship between the hall sensor and the magnet in the installed state of FIG. 1, in which FIG. 4 (A) shows a plan view, and FIG. 4 (B) shows a state seen from the lateral direction.

  As shown in FIG. 4 (A), the window opening / closing detection device 10 of this embodiment is attached to the vertical frame of the window sash 12a located inside by double-sided tape or screws, and is opposed to the right side surface of the window opening / closing detection device 10. The window opening / closing detection magnet 14 is adhered to the glass surface of the window sash 12b with double-sided tape.

  As shown in FIG. 4B, the window opening / closing detection hall sensor 46 built in the window opening / closing detection device 10 is mounted on the sensor substrate 45 so that the effective detection surface faces the window opening / closing detection magnet 14. When the window sashes 12a and 12b are closed, the distance d from the side surface of the apparatus is minimum, and the window open / close detection magnet 14 has a detection signal of a magnetic level that is maximum at a positive polarity, for example, according to the direction of the magnetic lines of force indicated by broken lines. Is output.

  The minimum distance d when the window is closed varies depending on the structure of the window sash and the attachment state of the window opening / closing detection device 10, but in the present embodiment, the window is at a magnetic force level when it is disposed at a distance within a specified range. The amplification factor and determination threshold value by the amplifier 52 are set so that the closed determination result can be obtained efficiently.

  This determination threshold value is set by a magnetic force level using a measurement environment in which a window opening / closing detection magnet 14 that is actually used in combination with a predetermined distance is used in an inspection process that is the final stage of the manufacturing process or initial registration work after installation. This is done through the registration process, and details will be made clear later.

  FIG. 5 is an explanatory diagram showing the relationship between the Hall sensor and the magnet in the installed state in which the opening and closing of the window is reversed with respect to FIG. In this case, as shown in FIG. 5A, the window sash 12b is on the inside, and the window opening / closing detection device 10 is installed in the vertical frame in the opposite direction to FIG.

  For this reason, in the state seen from the horizontal direction of FIG. 5B, the magnetic field lines indicated by the broken lines by the window opening / closing detection magnet 14 affixed to the glass surface of the window sash 12a pass through the window opening / closing detection hall element 46 from left to right. However, since the direction is opposite to that in the case of FIG. 4B, a magnetic force level detection signal having a negative polarity is output from the window opening / closing detection hall sensor 46.

  In the present embodiment, a determination threshold based on the measurement of the magnetic force level is set by the registration process at the manufacturing stage so that the opening / closing of the window can be determined for both the magnets of FIGS. 4 and 5 arranged on the left and right. .

  Further, in the present embodiment, a determination threshold value is set for judging an illegal act of bringing a strong magnet closer so that the window opening / closing detection device does not operate due to mischief or the like.

  FIG. 6 is a block diagram showing a circuit configuration of the window opening / closing detection apparatus according to the present embodiment. In FIG. 6, a processor 50 provided as a control unit is a computer known as a one-chip microcomputer, and includes a CPU, a ROM, a RAM, an AD conversion port, various input / output ports, etc. on one chip. In the embodiment, a nonvolatile memory 68 such as an EEPROM is externally attached.

  The magnetic force level detection signal detected by the window opening / closing detection hall sensor 46 by the window opening / closing detection magnet 14 provided on the window glass is amplified by the amplification circuit 52 and then applied to the AD conversion port 70 to convert the magnetic force level (AD Conversion value) is taken into the processor 50 and converted into, for example, 8-bit AD conversion data.

  Further, a magnetic force level detection signal detected by the lock detection hall sensor 48 by the crescent lock detection magnet 20 provided on the open / close lever 18 of the crescent lock 16 is also amplified by the amplifier circuit 54 and then applied to the AD conversion port 72 for digital conversion. The obtained magnetic force level (AD conversion value) is taken into the processor 50 and converted into 8-bit AD conversion data.

  A display unit 56, a frequency switch 58, a registration switch 60, a test switch 62, a tamper switch 64, and a wireless transmission unit 66 are provided for the processor 50.

  The display unit 56 is provided with a two-color LED of a red LED 56a and a green LED 56b. For example, the red LED 56a is turned on when abnormality is detected such as opening of a window or unlocking, and then the green LED 56b is turned on when the normal operation is restored. The frequency switch 58 selects any one of a plurality of usable channels prepared in advance for the wireless transmission unit 66.

  The registration switch 60 is used for setting a lock registration mode performed at the start of use of the present embodiment. A reed switch is used as the test switch 62. When the test magnet is brought close to the test switch 62, the test switch 62 operates to transmit a test message from the wireless transmission unit 66 to the monitoring device. The tamper switch 64 is a switch that detects attachment / detachment of the cover member 24.

  The wireless transmission unit 66 is provided with a transmission circuit, and wirelessly communicates the monitoring state to the monitoring panel.

  The nonvolatile memory 68 has a magnetic force level Vs acquired from the window opening / closing detection hall sensor 46 of the apparatus, a first determination threshold value TH1 for window opening / closing detection obtained based on the magnetic force level Vs, and a strong magnet caused by mischief or the like. A second determination threshold value TH2 for detecting the magnetic force is stored.

  The processor 50 is provided with a window opening / closing registration processing unit 74, a lock registration processing unit 76, a window opening / closing monitoring unit 78, a lock monitoring unit 80, and a communication control unit 82 as functions realized by execution of a program by the CPU.

  The window opening / closing registration processing unit 74 detects a magnetic force level Vs by the window opening / closing detection magnet 14 that is actually used in combination arranged at a predetermined distance, performs initial registration in the nonvolatile memory 68, and performs predetermined registration with respect to the initially registered magnetic force level Vs. The level lower by the ratio is registered in the nonvolatile memory 68 as the first determination threshold value TH1 for window opening / closing.

  Further, a level that is higher than the initially registered magnetic force level Vs by a predetermined ratio that cannot be monitored normally is registered in the nonvolatile memory 68 as the second determination threshold value TH2 for determining the magnetic force of a strong magnet that has been brought closer by mischief. The details of this window opening / closing registration process will be clarified later.

  As shown in FIG. 1, the lock registration processing unit 76 moves the open / close lever 18 of the crescent lock 16 to the unlocked position after the installation of the window open / close detection device 10, the window open / close detection magnet 14 and the crescent lock detection magnet 20 is completed. In this state, when the cover member 24 is removed and the registration switch 60 of the apparatus main body 22 is operated as shown in FIG. 3, a registration mode for a predetermined period is set and registration processing is executed.

  When the registration mode is started, the red LED 56a of the display unit 56 starts blinking. While the red LED 56a is blinking, the cover member 24 is mounted on the apparatus main body 22, and the open / close lever 18 of the crescent lock 16 is operated to the locked position so that the crescent lock detection magnet 20 is brought closer.

  During the operation of the registration mode, the lock registration processing unit 74 acquires the magnetic force level detected by the lock detection hall sensor 48 at a predetermined period, and compares it with a predetermined predetermined effective level. Stored in the nonvolatile memory 68 as a magnetic force level.

  The initial registration of the magnetic force level is performed a plurality of times, and when the effective level is exceeded for a predetermined number of times, the last obtained magnetic force level is initially registered in the nonvolatile memory 68.

  When the magnetic force level is effectively initially registered in the nonvolatile memory 68, the green LED 56b of the display unit 56 is turned on to notify the completion of the initial registration. When the initial registration is completed, the registration processing unit 74 calculates a value that is lower by a predetermined ratio than the initially registered magnetic force level, registers the value in the nonvolatile memory 68 as a determination threshold value for determining whether the crescent lock is unlocked, and locks monitoring unit 78. Starts monitoring of crescent locks.

  On the other hand, if the cover member 24 is closed and the opening / closing lever 18 of the crescent lock 16 is not returned to the locked position within a predetermined time in which the registration mode is set by operating the registration switch 60, the effective level is set. Since the magnetic force level cannot be obtained, the initial registration of the magnetic force level is not completed, and when the registration mode is set within a predetermined time, the red LED 56a switches from blinking to lighting, and an initial registration failure is displayed. Then, the error status of the registration process is set, and the lock monitoring of the crescent lock by the lock monitoring processor 78 is canceled.

  In this case, the initial registration of the magnetic force level can be performed again by returning the opening / closing lever 18 to the unlocked position, opening the cover member 24 and operating the registration switch 60.

  The window opening / closing monitoring unit 78 compares the magnetic force level obtained from the window opening / closing detection hall sensor 46 with the first determination threshold TH1 read from the nonvolatile memory 68, determines whether the window is open or closed, and sends a message indicating the determination result. The alarm is transmitted from the wireless transmission unit 66 to the monitoring panel and the alarm is released.

Further, the window opening / closing monitoring unit 78 is obtained from the window opening / closing detection hall sensor 46 in order to cope with a so-called fraudulent act of opening a window so that a magnetic force level does not fall below a threshold value by bringing a strong magnet from the outside. The received magnetic force level is compared with the second determination threshold value TH2 read from the non-volatile memory 68, and even when the magnetic force level exceeds the second determination threshold value TH2, a message indicating that the window has been opened is transmitted due to fraud.
In addition, based on the magnetic force level at the time of locking and unlocking, an appropriate range of the magnetic level of the normal use state is set, and if the magnetic force level deviates up and down from the appropriate range, it may be determined that fraud has occurred. good. In other words, the upper limit value of the proper use range is set to a value that is higher by a predetermined ratio than the magnetic force level at the time of locking, and the lower limit value is set to a value that is lower by a predetermined ratio than the zero point level at the time of unlocking, so that the magnetic force is within the proper range. It is possible to detect whether there is a level and determine fraud. This can be applied to either the measurement of the magnetic level of the crescent lock or the measurement of the magnetic level of the window opening / closing detection.

  The lock monitoring unit 80 compares the magnetic force level obtained from the lock detection hall sensor 48 with the threshold set by the lock registration processing unit 76, and determines that the crescent lock is unlocked when the lock level is below the threshold. The electronic message shown is transmitted from the wireless transmission unit 66 to the monitoring device to give an alarm. In addition, even when the locking monitoring unit 80 returns to normal after detecting unlocking, the locking monitoring unit 80 wirelessly transmits a message to that effect to the monitoring device.

  In addition to the transmission of a message based on the judgments of the window opening / closing monitoring unit 78 and the lock monitoring unit 80, the communication control unit 82 transmits a regular notification message at regular time intervals.

  FIG. 7 is an explanatory diagram showing the arrangement of magnets and hall sensors in the initial registration of the magnetic force level for window opening / closing monitoring performed in a measurement environment such as an inspection process during manufacturing.

  In FIG. 7, if the window opening / closing detection device 10 that has been assembled is placed in a measurement environment and, for example, a site installation as shown in FIG. 4 is planned, a window opening / closing detection hall sensor 46 built in the window opening / closing detection device 10. The window opening / closing detection magnet 14 that is actually used is disposed so as to be opposed to the effective detection surface of the device by separating d = 20 mm from the left side surface of the apparatus.

  In this case, the position of the window opening / closing detection magnet 14 in the height direction is set so that the upper end of the magnet is aligned with the marker 24a formed on the cover member 24 shown in FIG. The positional relationship of FIG. 7 where the detection hall sensor 46 is located is obtained.

  For the window opening / closing detection device 10, a personal computer for registration support is connected to the serial port 55, for example, and a program that functions as the window opening / closing registration processing unit 74 is downloaded.

  When the setting in the test environment is completed, as shown in FIG. 3, when the registration switch 60 is turned on with the cover 24 removed, the red LED 56a blinks and the downloaded window opening / closing registration processing program is started. To set the window open / close registration mode and start the registration operation. When the registration switch 50 is operated, the cover member 24 is quickly closed to the apparatus main body.

  This registration operation takes in the magnetic force level detected by the window opening / closing detection hall sensor 46, determines whether or not the effective level is set in advance, and if the effective magnetic level Vs is obtained, the nonvolatile memory 68 is obtained. Register for initial registration. When this initial registration is completed, the green LED 56b is turned on to notify the completion of the initial registration.

  In the initial registration of the magnetic force level, the magnetic force level is taken in a plurality of times, and the magnetic force level Vs obtained last is initially registered in the nonvolatile memory 68 when the effective level is exceeded a predetermined number of times.

  When the initial registration of the magnetic force level Vs is completed, a level lower than the predetermined ratio is calculated as the first determination threshold value TH1 for window opening / closing detection and registered in the nonvolatile memory 68. Further, a second determination threshold value TH2 that is a magnetic force level that cannot be assumed in a normal monitoring state that is higher by a predetermined ratio than the initially registered magnetic force level Vs is calculated and registered in the nonvolatile memory 68 in order to determine a strong magnetic force applied by mischief.

  When the window opening / closing registration processing is completed, the window opening / closing registration processing program downloaded for this purpose may be left, but is deleted because it is unnecessary.

  When the installation site is as shown in FIG. 5, the window opening / closing detection magnet 14 is arranged on the right side of the apparatus and the same window opening / closing registration process is executed to perform initial registration of the magnetic force level Vs and the first and second determination thresholds. Register TH1 and TH2.

  However, after the window opening / closing detection magnet 14 is placed on the left side and the magnetic force level is initially set and the determination threshold value is obtained, even if the reverse placement relationship is obtained at the actual site, the difference between the left and the right for the initially registered magnetic force level There is almost no difference in level, and even if the layout is reversed, it is possible to monitor the opening and closing of the window by installing it as it is without performing initial registration again.

  FIG. 8 is a graph showing the AD conversion characteristics of the magnetic level detection signal by the AD conversion port 70 of FIG. The window opening / closing detection hall sensor 46 shown in FIG. 6 outputs a positive polarity magnetic level detection signal and a negative polarity magnetic level detection signal depending on the direction of passage of the magnetic lines of force.

  A magnetic level detection signal from the window opening / closing detection hall sensor 46 is amplified by the amplifier circuit 52 and then converted to, for example, 8-bit magnetic force level data (AD conversion value) by the AD conversion port 70.

  The conversion characteristics of the AD conversion port 70 have values of 0 to 256 as decimal AD conversion values as shown on the vertical axis in FIG. 8, and the input positive magnetic level detection signals 0 to + Vmax are converted into AD conversion values. Conversion to 128 to 256, and the input negative magnetic level detection signals 0 to -Vmax are converted to AD conversion values 128 to 0.

  FIG. 9 is a graph showing the relationship of the magnetic force level detected by the window opening / closing detection hall sensor 46 with respect to the distance d from the device side surface to the window opening / closing detection magnet 14 in this embodiment. The actual conversion characteristics of the AD conversion port 70 are as shown in FIG. 8, but in FIG. 9, the AD conversion value is set to 0 regardless of the polarity of the magnetization level detection signal in order to simplify the description. ~ 128.

  The characteristic of FIG. 9 shows the AD conversion value corresponding to the magnetic force level measured by changing the distance d from the device side surface to the window opening / closing detection magnet 14 in the range of d = 0 to 24 mm in the installation state of FIG. ing.

  In such characteristics, for example, if a magnet arrangement with d = 20 mm is planned, a magnetic force level Vs corresponding to the point P at this time is obtained. Subsequently, a value lower than the magnetic force level Vs by a predetermined ratio α is set as the first determination threshold value TH1, and a value higher than the magnetic force level Vs by a predetermined ratio is set as the second determination threshold value TH2.

  FIG. 10 is an explanatory view showing the setting of a determination threshold value for the output of the window opening / closing detection hall sensor 46 and the AD conversion value and the result of the window opening / closing in this embodiment.

  The Hall sensor output in FIG. 10A and the AD conversion value in FIG. 10B correspond to the conversion characteristics in FIG. 8, and if a positive magnetic force level Vs is initially registered in FIG. The first determination threshold value TH1 is set as a value having a low ratio, and the second determination threshold value TH2 is set as a value having a high predetermined width for fraud determination.

  Further, although the magnetic level −Vs for the negative polarity is not initially registered, the detection characteristics of the magnets located on the left and right sides of the apparatus side are regarded as symmetrical characteristics, and the magnetic level −Vs having the same value but different polarity is assumed. The negative determination threshold value -TH2 is set.

  When the initially registered magnetic force level is -Vs, the first determination threshold value -TH1 and the second determination threshold value -TH2 are set in the same manner. 2 determination threshold TH2 is set.

For such setting of the first determination thresholds TH1, -TH1 and the second determination thresholds TH2, -TH2, the window opening / closing detection characteristics of FIG. 10C are as follows.
(1) When the detected magnetic force level is positive polarity, it is determined that the window is open when the threshold value is equal to or lower than the first determination threshold value TH1 or the second determination threshold value TH2, and the window is closed when the threshold value exceeds the first determination threshold value TH1 and is less than the second determination threshold value TH2. Is determined.
(2) When the detected magnetic force level is negative polarity, it is determined that the window is open when the first determination threshold value is greater than or equal to TH1 or less than or equal to the second determination threshold value TH2, and the second determination threshold value is less than TH1 and exceeds the second determination threshold value -TH2. It is determined that the window is closed.

  Here, the polarity determination of whether the detected magnetic force level is positive or negative is determined as positive if the AD conversion value is 128 or more, and negative if it is less than 128. Actually, since the output of the Hall sensor includes an offset, the determination is made in consideration of the offset.

The relationship between the initially registered magnetic force levels Vs, -Vs, the first determination thresholds TH1, -TH1, the second determination thresholds TH2, -TH2, and the window opening / closing determination is also shown in FIG.
On the plus side of FIG. 8, the point P corresponds to the initially registered magnetic force level Vs, and the points Q and R before and after that correspond to the first determination threshold TH1 and the second determination threshold TH2.

  In a normal window opening / closing monitoring state, the magnetic force level and AD conversion value change between the P point and the zero point with respect to the opening / closing of the window, and if it exceeds the P point, the window closing is determined. If it falls below point P in the state, it is determined that the window is open.

  On the other hand, when a strong magnet is brought closer due to mischief or the like, for example, if the magnetic force is in the plus direction, it increases beyond the point R, and in this case also, the door opening is determined. On the other hand, if the magnetic force is in the negative direction, it drops beyond the point U corresponding to the second determination threshold value -TH2 set on the negative side.

  Also on the minus side of FIG. 8, the S point corresponds to the initially registered magnetic force level −Vs, and the T and U points before and after that correspond to the first determination threshold −TH1 and the second determination threshold −TH2.

  FIG. 11 is a flowchart showing the window opening / closing registration process of the present embodiment by the processor of FIG.

  In FIG. 11, when the power is turned on by mounting the battery 44 in the state where the setting in the measurement environment as shown in FIG. 7 is completed, initialization processing and self-diagnosis processing are executed in step S1, and there is no abnormality. For example, the process proceeds to step S2, and the data stored in the nonvolatile memory 68 is read.

  Subsequently, the presence / absence of the window opening / closing registration mode is determined in step S3. For example, when the setting of the window opening / closing registration mode by turning on the registration switch 60 is determined, the process proceeds to step S4, and the red LED 56a blinks. The magnetic force level Vs detected by the opening / closing detection hall sensor 46 is read, and if it is determined that it is equal to or higher than the effective level in step S6, the process proceeds to step S7, where the magnetic force level Vs is initially registered in the nonvolatile memory 68.

  As an actual process of steps S5 to S7, the magnetic force level is fetched a plurality of times, and when the effective level is exceeded continuously for a predetermined number of times, the finally obtained magnetic force level Vs is initially registered in the nonvolatile memory 68. To do.

  Subsequently, in step S8, the first determination threshold value TH1 for window opening / closing detection is calculated as a value lower by a predetermined ratio than the initially registered magnetic force level Vs and registered in the nonvolatile memory 68. Further, a second determination threshold value TH2 for mischief detection is calculated as a predetermined high value for fraud determination with respect to the magnetic force level Vs initially registered in step S9 and registered in the nonvolatile memory 68. At this time, the second determination threshold TH2 simultaneously registers the minus side -TH2.

  When such a series of window opening / closing registration processing is completed, the green LED 56b is turned on in step S10 to notify the completion of registration, and the processing ends.

  FIG. 12 is a flowchart showing the monitoring process of this embodiment by the processor of FIG.

  In FIG. 12, when the power is turned on by mounting the battery 44 in the state where the on-site installation as shown in FIG. 4 is completed, initialization processing and self-diagnosis processing are executed in step S11. If there is no abnormality, step S12 is executed. Then, the data including the magnetic force level Vs of the window opening / closing monitoring and the first and second determination threshold values TH1 and TH2 stored in the nonvolatile memory 68 is read.

  Subsequently, the process proceeds to step S13, where it is determined whether or not the lock monitoring registration mode is set. When the setting of the lock monitoring registration mode is determined by opening the cover member 24 and turning on the registration switch 60, the process proceeds to step S14. Locking monitoring registration processing including initial registration of the magnetic force level by the detection hall sensor 48 and registration of a determination threshold for detecting locking and unlocking of the crescent lock 16 is executed.

  Subsequently, in step S15, it is determined whether or not a predetermined monitoring period has been reached. If it is determined that the monitoring period has been reached, the process proceeds to step S16 to execute a low battery monitoring process for the battery 44. At this time, if the battery voltage drops below a specified voltage, a message indicating a low battery is wirelessly transmitted to the monitoring panel to display a failure.

  Next, in step S17, a window opening / closing monitoring process is executed, and when a window opening or window closing is determined, a message indicating the contents is transmitted to the monitoring board. In step S18, the lock monitoring process is executed, and when unlocking or subsequent locking is determined, a message indicating the content is transmitted to the monitoring device. Subsequently, in step S19, it is determined whether or not the regular notification time has elapsed, and if it has been determined, the process proceeds to step S20 to perform regular notification processing for transmitting a regular notification message to the monitoring panel.

  FIG. 13 is a flowchart showing details of the window opening / closing monitoring process in step S17 of FIG.

  In FIG. 13, first, in step S21, the magnetic force level detected by the window opening / closing detection hall sensor 46 is acquired as an AD conversion value, and in step S22, it is determined whether or not the polarity is positive by comparison with the zero point level 128 ± 20. If the positive polarity is determined, the process proceeds to step S23, and if it is determined that the previous determination is an open determination, the process proceeds to step S24 and is compared with the first determination threshold value TH. If the magnetic force level is equal to or lower than the first determination threshold TH, the process proceeds to step S25 to make an open determination, and the determination result is wirelessly transmitted in step S26.

  When the magnetic force level is larger than the first determination threshold value TH1 in step S24, the process proceeds to step S27 and compared with the second determination threshold value TH2. Considering the situation where the action is being performed as window opening, the process proceeds to step S25 to make an open determination, and the determination result is wirelessly transmitted in step S26.

  If the previous determination was an open determination in step S23, the process proceeds to step S28, and if the magnetic force level is greater than the first determination threshold level TH1 and less than the second determination threshold TH2, the process proceeds to step S29 to perform a close determination. In step S30, the determination result is wirelessly transmitted.

  If the negative polarity of the magnetic force level is determined in step S22, the process proceeds to step S31. If it is determined that the previous determination is an open determination, the process proceeds to step S32 and is compared with the first determination threshold value -TH. If the magnetic force level is equal to or higher than the first determination threshold value -TH1, the process proceeds to step S33 to make an open determination, and the determination result is wirelessly transmitted in step S34.

  When the magnetic force level is smaller than the first determination threshold value -TH1 in step S32, the process proceeds to step S35 and is compared with the second determination threshold value -TH2. A situation where a fraudulent act in the vicinity is being performed is regarded as a window open, the process proceeds to step S33 to make an open determination, and the determination result is wirelessly transmitted in step S34.

  If the previous determination was a close determination in step S31, the process proceeds to step S36, and if the magnetic force level is smaller than the first determination threshold level-TH1 and greater than the second determination threshold-TH2, the process proceeds to step S37 and the close determination is made. In step S38, the determination result is wirelessly transmitted.

  In the above embodiment, a program for executing the window opening / closing registration process is downloaded from a personal computer for support and executed. However, the program is stored in advance in the ROM of the processor 50 or the externally connected volatile memory 68. You may make it run.

  As another method of the window opening / closing registration process, the output voltage of the amplification circuit 54 provided in the window opening / closing detection device 10 is measured with a voltage measuring device, and then AD conversion is performed to obtain a magnetic force level Vs, which is used with a lighter. Then, it may be written in the nonvolatile memory 68 together with the determination threshold value TH.

  In the above embodiment, the determination threshold TH is obtained by initial registration of the magnetic force level Vs including the offset of the Hall sensor, but the offset of the Hall sensor is measured and stored in the nonvolatile memory. When calculating the determination threshold value from the initially registered magnetic force level Vs, the magnetic force level change amount is accurately obtained by subtracting the offset from the magnetic force level, a value lower by a predetermined ratio is obtained from this change amount, and the offset is added to this value. The determination threshold value TH may be used.

  Further, in the above embodiment, both the opening / closing monitoring of the window and the unlocking monitoring of the crescent lock are performed, but the present invention can be applied as it is to a window opening / closing detection device that only monitors the opening / closing of the window. The present invention can also be applied to the unlocking monitoring side of the crescent lock, and the threshold value registration process may be performed not only at the time of factory shipment but also after installation on the monitoring target.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

Explanatory drawing which showed the installation state of the window opening / closing detection apparatus by this invention Assembly exploded view showing an embodiment of a window opening and closing detection device according to the present invention Explanatory drawing which showed the state which removed the cover member from the apparatus main body about the window opening / closing detection apparatus by this embodiment Explanatory drawing which showed the relationship between a hall sensor and a magnet in the installation state of FIG. Explanatory drawing which showed the relationship between a hall sensor and a magnet in the installation state in which the opening and closing of the window was reversed with respect to FIG. The block diagram which showed the circuit structure of the window opening / closing detection apparatus by this embodiment Explanatory drawing showing the arrangement of magnets and hall sensors in the initial registration of the magnetic level of window opening and closing monitoring performed in the measurement environment such as the adjustment process The graph which showed the AD conversion characteristic of the magnetic level detection signal by the AD conversion port of FIG. The graph which showed the relationship of the magnetic force level detected with the Hall sensor with respect to the distance from the apparatus side surface to a magnet in this embodiment Explanatory drawing which showed the determination result of the setting of the determination threshold value with respect to the Hall sensor output and AD conversion value in this embodiment, and window opening and closing The flowchart which showed the window opening / closing registration process performed by the processor of FIG. 6 in the measurement environment of FIG. The flowchart which showed the window opening / closing detection process of this embodiment by the processor of FIG. The flowchart which showed the detail of the window opening / closing monitoring process in step S28 of FIG.

Explanation of symbols

10: Window open / close detection device 14: Window open / close detection magnet 16: Crescent lock 18: Open / close lever 20: Crescent lock detection magnet 22: Device main body 42: Main body cover 46: Window sensor for detecting opening / closing of window 48: Hall sensor 60 for detecting lock : Registration switch

Claims (4)

A magnetic sensing element for detecting a magnetic force level by a magnet arranged inside the apparatus and arranged on the monitoring object side;
A registration processing unit for registering a first determination threshold lower than a magnetic level by the magnet corresponding to a closed state of the window, and a second determination threshold higher than the magnetic level by a predetermined ratio;
A window open / close determining unit that compares the magnetic force level detected by the magnetic sensing element with the first determination threshold value or less and the second determination threshold value to determine the state of the monitoring object;
A window open / close detection device comprising:
In the window opening and closing detection device according to claim 1,
The registration processing unit determines the polarity of the magnetic force level of the magnetic sensing element, registers the first determination threshold corresponding to the determined polarity, and registers the second determination threshold corresponding to both polarities,
The window open / close determining unit determines the polarity of the magnetic force level detected by the magnetic sensing element,
When the positive polarity is determined, the first determination threshold and the second determination threshold of the positive polarity are selected. When the previous determination is the closing determination, when the magnetic force level is equal to or lower than the first determination threshold or equal to or higher than the second determination threshold. When opening is determined and the previous determination is an opening determination, a window closing is determined when the magnetic force level exceeds the first determination threshold and is less than the second determination threshold,
When the negative polarity is determined, the first threshold value and the second threshold value of the negative polarity are selected, and when the previous determination is a close determination, the window is opened when the magnetic force level is equal to or higher than the first threshold value or equal to or lower than the second threshold value. And determining whether the window is closed when the magnetic force level is less than the first threshold value and greater than the plus-side second threshold value.
2. The window opening / closing detection apparatus according to claim 1, wherein the registration processing unit detects a magnetic force level by a magnet actually used in combination arranged at a predetermined distance in a predetermined measurement environment, and initially registers it in a nonvolatile memory. A window opening / closing detection device characterized by the above.
  2. The window opening / closing detection apparatus according to claim 1, wherein the magnetic detection element is a Hall sensor that outputs a signal having a positive polarity or a negative polarity according to a direction of magnetic force.

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