JP5103929B2 - Ventilation equipment - Google Patents

Description

  The present invention relates to a false detection prevention method for a ventilator that automatically operates by detecting a person.

  Today, as a consideration for the environment and requests from end users, suppression of power consumption of electrical appliances is a major factor. As a method for suppressing power consumption in a ventilator, there is a method of automatically operating only when ventilation is necessary using various sensors. As an example, in order to perform local ventilation automatically only when a person enters a toilet or the like, a method of detecting the person's room entry with an infrared sensor is used (for example, see Patent Document 1).

JP 2001-087170 A

  In such a conventional ventilator, since an infrared sensor is used as a method for detecting a person's entry, the infrared sensor is activated when the person enters the room when the infrared ray changes due to, for example, an outside wind. There was a possibility of false detection.

  This invention solves the said subject, and it aims at providing the prevention method of the false detection of the ventilation apparatus which detects a person and operates automatically.

  In order to solve the above-mentioned problems, a ventilator according to the present invention comprises a human detection means for detecting a change in infrared rays generated from a person entering a room, and a fan for ventilating indoor air from a ventilation port for ventilating indoor air. And an outside wind detecting means for detecting outdoor wind outside the room, a control means for controlling the person detecting means, the fan, and the outside wind detecting means, and a change in infrared detected by the person detecting means is the control. When the person detection determination threshold stored in the memory of the means is exceeded, the fan is operated by the control means to ventilate the indoor air, and the person enters the room due to the outside air flowing into the room from the ventilation port. If the outside wind is strong due to the detection result of the outside wind detecting means so that the infrared detection is not caused and the person detecting means is not erroneously detected in spite of the fact that the control means does not detect the person detection determination threshold change It features a Rukoto.

  Another means of the ventilator of the present invention is characterized in that a wind speed sensor is used as the outside wind detecting means.

  Another means of the ventilator of the present invention is characterized in that a temperature sensor is used as the outside wind detecting means.

  Another means of the ventilator according to the present invention is characterized in that the rotational speed of the fan is used as the outside wind detecting means.

Another means of the ventilating apparatus of the present invention is characterized by comprising notifying means for notifying a human detection determination threshold value, and notifying the current human detection determination threshold value.

  As described above, according to the ventilator of the present invention, it is possible to provide a method for preventing false detection of a ventilator that automatically operates by detecting a person.

The perspective view which shows the structure of the ventilation apparatus of Embodiment 1-4 of this invention. Block diagram showing the control system of the ventilator Flow chart showing the operation of the ventilator automatically Flow chart showing output voltage of infrared sensor and human detection determination threshold Flow chart showing the operation of the ventilator automatically

    According to a first aspect of the present invention, there is provided a ventilator comprising: a person detecting means for detecting a change in infrared rays generated by a person entering a room; a fan for ventilating indoor air from a ventilation port for ventilating indoor air; An outside wind detecting means for detecting the outside wind, and a control means for controlling the person detecting means, the fan, and the outside wind detecting means, and a change in infrared detected by the person detecting means is a memory of the control means. When the person detection determination threshold stored in the table is exceeded, the fan is operated by the control means to ventilate the indoor air, and no person has entered the room due to the outside air flowing into the room from the ventilation port. However, the control means changes the person detection determination threshold when the outside wind is strong due to the detection result of the outside wind detection means so that the infrared detection does not occur and the person detection means does not detect it erroneously. Specially Even if the influence of outside winds greatly changes depending on the location of the ventilation device, it is possible to automatically detect and detect people appropriately by adjusting the human detection determination threshold appropriately. It becomes.

  The invention of the ventilator according to claim 2 is characterized in that, in the ventilator according to claim 1, a wind speed sensor is used as the outside wind detecting means, and the influence of the outside wind is easily detected and an error is detected. Detection can be prevented.

The invention of the ventilator according to claim 3 is characterized in that, in the ventilator according to claim 1, a temperature sensor is used as the outside wind detecting means. It is possible to predict that the wind will flow into the room, and it is possible to detect the influence of the outside wind by a temperature sensor that is inexpensive and easy to control, thereby preventing erroneous detection.

The invention of the ventilator according to claim 4 is characterized in that, in the ventilator according to claim 1, the number of rotations of the fan is used as the outside wind detecting means, and when the outside wind flows into the room, the fan It is possible to easily detect the influence of the external wind and prevent erroneous detection by utilizing the change in the number of rotations.

The invention of the ventilator according to claim 5 is characterized in that, in the ventilator according to claim 1, the ventilator is provided with notifying means for notifying the human detection determination threshold, and notifying the current human detection determination threshold. Yes, the user can easily check the current settings.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. As shown in the figure, a ventilating apparatus according to the present invention includes a main body 5 provided with a fan 4 for ventilating indoor air from a ventilation port 3 communicating with the room through a filter 1 and a ventilation duct 2 in a general household toilet or the like. The body 5 is provided with a shade 6. A gap is provided between the main body 5 and the shade 6 so that air can pass in the vertical direction. When the filter 1 is cleaned, the shade 6 can be opened upward around the fixing screw 7. . The fan 4 exhausts the room air from the ventilation port 3 to the outside such as outdoors, and the room air is ventilated. The ventilation port 3 may be provided on the ceiling surface of the room.

  In addition, a human detection means 8 is provided on the lower surface of the main body 5 and is connected to a control means 10 on which a microcomputer 9 is mounted. A shield 11 is provided around the person detection means 8 so as to cover the person detection means 8 in order to shield the influence of air passing through the gap between the main body 5 and the shade 6. As the shielding object 11, it is only necessary to prevent the ambient air from changing the infrared rays around the infrared sensor. For example, as shown in FIG. 1, an enclosure that surrounds a portion of the human detection unit 8 that is easily affected by the external wind. and so on.

  In the above configuration, using the flowchart of FIG. 3, the operation of the ventilation device installed in a general household toilet detecting the change of infrared rays to automatically operate the fan 4 is described. A method for preventing this will be described. In STEP 1, no person enters the toilet and the fan 4 is not energized. In STEP2 and STEP3, when the microcomputer 9 determines that a person has entered the room by comparing the detection result of the person detection means 8 with the person detection determination threshold value stored in the memory 12 built in the microcomputer 9 in advance. The fan 4 is energized. Here, an infrared sensor is conceivable as the person detecting means 8, and utilizing the fact that the output voltage changes when the infrared sensor detects a change in the infrared ray generated from the person, for example, as shown in FIG. When there is no change (for example, 2V), if the output voltage of the sensor changes by more than ± 0.45V which is the human detection determination threshold, the microcomputer 9 determines that a person is entering the room and energizes the fan 4 To do.

  In STEP4 and STEP5, the energization time to the fan 4 is integrated by the microcomputer 9, and the energization to the fan 4 is automatically stopped when the time exceeds a certain time. Here, the fixed time is preferably about 30 minutes as the time for the fan 4 to sufficiently ventilate the dirty air.

  Next, in the ventilating apparatus that operates as described above, a factor that causes erroneous detection of the infrared sensor due to outside wind will be described. In STEP 2 of FIG. 3, since an infrared sensor detects a change in infrared rays, a change in infrared rays occurs when outside air enters the room from the ventilation opening 3 and the air around the infrared sensor moves rapidly. When the output voltage of the infrared sensor changes and exceeds the human detection determination threshold, the microcomputer 9 erroneously detects that a person has entered the room.

  In the present invention, the shielding object 11 is provided so that a change in the infrared rays around the infrared sensor does not occur due to the outside wind, and it is possible to prevent erroneous detection. Here, as the material of the shielding object 11, it is easy to absorb the change in the infrared rays due to the outside wind if a plastic that absorbs infrared rays or the like is used. Moreover, since the infrared absorption efficiency improves when black is used as the color of the shielding object 11, it is better.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are given the same numbers, and detailed description thereof is omitted. As shown in the drawing, the lower surface of the main body 5 is provided with switching means 13 having a variable human detection determination threshold, and the switching means 13 is connected to the control means 10.

  Here, a case where a two-contact slide switch is used as the switching means 13 will be described. Each contact of the slide switch is connected to the microcomputer 9, and the person detection determination threshold value can be selected from two values of ± 0.45V or ± 0.60V stored in the memory 12 in advance by switching the contact. As a result, when the influence of the outside wind is strong depending on the installation location of the ventilator and the infrared sensor detects falsely, the user can select ± 0.60 V as the human detection determination threshold to prevent false detection due to the outside wind. Is possible. Further, when the influence of the external wind is weak and it is desired to detect a fine movement of a person, ± 0.45 V may be selected in order to improve the sensitivity of the infrared sensor.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first or second embodiment are given the same numbers, and detailed description thereof is omitted. As shown in the figure, the ventilation opening 3 is provided with an outside wind detecting means 14, and the outside wind detecting means 14 is connected to the control means 10.

  Here, a method of preventing erroneous detection will be described with reference to the flowchart of FIG. Steps other than STEP 7 to STEP 9 are the same as those in the flowchart of FIG. In STEP 7 to STEP 9, either ± 0.45 V or ± 0.60 V stored in advance in the memory 12 is used as a human detection determination threshold value according to the strength of the outside wind detected by the outside wind detecting means 14. Computer 9 selects. The outside wind detecting means 14 only needs to be able to detect outside wind, and examples thereof include a wind speed sensor, a temperature sensor, and a hall element. Hereinafter, a method for detecting the external wind in each will be described.

  When a wind speed sensor is used as the outside wind detecting means 14, a wind speed sensor is provided around the ventilation opening 3 in a place where the air ventilated outside the ventilation opening 3 is not exposed to the air, and the wind speed detected by the wind speed sensor is 5 m / s or more. When the outside wind is strong, there is a high possibility that a change in infrared rays will occur due to the outside wind flowing into the room from the vent 3 and the false detection will be made. Therefore, the human detection judgment threshold is set to ± 0.60 V and less than 5 m / s In this case, ± 0.45 V is selected so that the sensitivity of the infrared sensor is good so that the fine movement of a person can be detected.

  When a temperature sensor is used as the outside wind detecting means 14, temperature sensors are provided at two locations around the vent 3 and the person detecting means 8, and if the temperature difference between the inside and outside of the room is 5 ° C. or more, it will Since there is a high possibility that the wind will flow into the room and make a false detection, the human detection determination threshold is set to ± 0.60 V, and if it is less than 5 ° C., the sensitivity of the infrared sensor is good so as to detect human tremors ± 0. Select 45V.

  When a Hall element is used as the outside wind detecting means 14, if a Hall element is provided around the fan 4 and the Hall element detects that the rotation speed of the fan 4 is 100 rpm or more even though the fan 4 is not energized, Since the fan 4 is rotating due to the inflow of wind and the possibility of erroneous detection is high, the human detection determination threshold is set to ± 0.60 V, and if it is less than 100 rpm, the possibility of erroneous detection due to the incoming external wind is low, Select ± 0.45V with good sensitivity of the infrared sensor so that human tremor can be detected.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIGS. The same parts as those in any of Embodiments 1 to 3 are given the same numbers, and detailed descriptions thereof are omitted. As shown in the figure, a notification means 15 is provided on the lower surface of the main body 5, and the notification means 15 is connected to the control means 10.

  Here, a case where two LEDs are used as the notification unit 15 will be described. When the human detection judgment threshold is ± 0.45V, the blue LED is turned on, and when the human detection judgment threshold is ± 0.60V, the user can easily check the current human detection judgment threshold, that is, the sensitivity of the infrared sensor. When it is felt that the detection sensitivity is low, the human detection determination threshold can be arbitrarily changed by the switching means 13.

  The ventilator according to the present invention is a device that automatically detects a person with few false detections and automatically operates, and is useful for a ventilator used in a general household toilet.

4 Fan 8 Person detecting means 10 Control means 11 Shielding object 12 Memory 13 Switching means 14 Outside wind detecting means 15 Notification means

Claims (5)

A person detecting means for detecting a change in infrared rays generated from a person entering the room, a fan for ventilating the indoor air from the ventilation port for ventilating the indoor air, and an outdoor wind detecting means for detecting the outdoor air outside the room And a control means for controlling the person detection means, the fan and the outside wind detection means, and a change in infrared detected by the person detection means exceeds a person detection determination threshold value stored in a memory of the control means. In this case, the fan is operated by the control means to ventilate indoor air, and a change in infrared rays occurs even though no person is entering the room due to outside air flowing into the room from the ventilation port. A ventilator characterized in that the control means changes the person detection determination threshold when the outside wind is strong according to the detection result of the outside wind detection means so that the person detection means does not detect it erroneously. The ventilation apparatus according to claim 1, wherein a wind speed sensor is used as the outside wind detecting means. The ventilation device according to claim 1, wherein a temperature sensor is used as the outside wind detecting means. The ventilation apparatus according to claim 1, wherein the rotation speed of the fan is used as the outside wind detecting means. The ventilation device according to claim 1, further comprising a notification unit that notifies a human detection determination threshold, and notifies the current human detection determination threshold.

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