JPH1114109A - Apparatus for automatically operating ventilating fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a ventilating fan from being operated over a longer period of time than needed even when gas to be detected is reemitted to a detection device over a long period of time with a filter provided on a gas sensor device part. SOLUTION: An apparatus includes arithmetic operation means 6 which receives an output signal of a gas sensor device 1 to calculate resistance, control means 9 for controlling operation of a ventilating fan 8 by comparing a reference resistance and a present resistance, and reference resistance correction means 10 for correcting the present resistance by updating the reference resistance based upon a predetermined update rate and comparing the reference resistance and the present resistance by approaching them to each other in a predetermined time rate. Hereby, the ventilating fan 8 is prevented from being operated over a longer period of time than needed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic operation device for a ventilation fan for automatically operating a ventilation fan in response to tobacco smoke generated indoors.

[0002]

2. Description of the Related Art In recent years, ventilation fans intended for indoor ventilation have been becoming mainstream in response to changes in the indoor environment. For example, ventilation fans automatically operated in response to tobacco smoke or the like generated indoors. .

Conventionally, an automatic operation device of this type for a ventilation fan has been generally known as shown in FIGS.
Hereinafter, the configuration will be described with reference to FIGS. 9 and 10.

[0004] As shown in FIG.
Provided a sensing element 102 and a heater 103, and provided a sensing element 10
2 is formed in a sensor case 104 which is heated by a heater 103 to increase the detection sensitivity by maintaining the temperature at a constant temperature, and is provided in the sensor case 104; A filter 105 for adsorbing and decomposing gas is provided, and a change in the concentration of the gas to be detected is detected based on a temporal change in the resistance of the gas sensor element 101 after detection with respect to the resistance of the gas sensor element 101 before detection of the gas to be detected. A concentration judging means 106 for judging, and when the concentration of the gas to be detected judged by the concentration judging means 106 has changed to a value equal to or higher than a preset ventilation concentration value, the ventilation fan 107 is operated, and a preset stop concentration value The control means 108 for stopping the ventilation fan 107 when the following changes are made is provided, and the ventilation fan 107 is automatically operated.

[0005]

In such a conventional automatic operation device of a ventilation fan, a specific non-detection target gas is adsorbed on a filter 105 provided in a sensor case 104, and the detection target gas is decomposed by the filter 105. Is released from the filter 105 for a longer time and fills the sensor case 104, the gas sensor element 10
The resistance value of the gas sensor element 101 with respect to the change in the concentration of the gas to be detected in the air changes in the sensor case 104 re-emitted from the filter 105. The concentration of the detection target gas determined by the concentration determination means 106 is higher than the actual detection target gas concentration in the air in order to be in a state added to the change in the resistance value due to the detection target gas filled in. In order to make an erroneous determination, there is a problem that the ventilation fan 107 is operated for a longer time than necessary.

The present invention has been made to solve the above-mentioned problem, and is intended to prevent the ventilation fan from being operated for a longer time than necessary even when the gas to be detected is re-emitted to the sensing element for a long time by the filter provided in the gas sensor element portion. In addition, when the gas to be ventilated is not re-emitted from the filter, the detection of the gas to be detected and the operation of the ventilation fan can be appropriately performed. An object of the present invention is to provide an automatic driving device for a ventilation fan that can perform detection more reliably.

[0007]

According to the automatic ventilating fan operating device of the present invention, a gas sensor element whose resistance value changes in accordance with indoor dirt, and a gas sensor element which receives an output signal of the gas sensor element and receives the output signal of the gas sensor element. Calculating means for calculating the resistance value, and control means for controlling the operation of the ventilation fan by comparing the reference resistance value before the change in the resistance value as the reference of the gas sensor element and the current resistance value calculated by the calculating means. After the resistance value of the gas sensor element fluctuates, the reference resistance value is updated based on a constant update rate, and the reference resistance value and the current resistance value are approached at a fixed time ratio and compared to determine. This is provided with a reference resistance correction means for correcting.

According to this invention, even when the gas to be detected is re-released to the sensing element for a long time by the filter provided in the gas sensor element portion, the automatic operation device of the ventilation fan in which the ventilation fan is not operated for a long time than necessary is required. Can be provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a gas sensor element whose resistance value changes in accordance with the contamination of indoor air, and a gas sensor element which receives an output signal of the gas sensor element. Calculating means for calculating the resistance value of the gas sensor element, and control means for controlling the operation of the ventilation fan by comparing the reference resistance value before the change in the resistance value, which is the reference of the gas sensor element, with the current resistance value calculated by the calculating means. After the resistance value of the gas sensor element fluctuates, the reference resistance value is updated based on a constant update rate, and the reference resistance value and the current resistance value are approached at a fixed time ratio for comparison and determination. This is a configuration of an automatic operation device of a ventilation fan provided with a reference resistance value correction means for correcting the target gas, and the detection target gas is returned to the sensing element for a long time by the filter provided in the gas sensor element part. Even after being output, after the resistance value of the gas sensor element fluctuates, the reference resistance value is updated by the reference resistance correction means so as to approach the current resistance value based on a constant update rate, and compared with the current resistance value, the ventilation fan Since the operation is controlled, the ventilation fan is prevented from being operated for an unnecessarily long time.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) As shown in FIGS. 1 to 3, the gas sensor element 1 is provided with a sensing element 2 and a heater 3, and the sensing element 2 is heated by the heater 3 and is maintained at a constant temperature to increase the detection sensitivity. A filter 5 such as silica gel that adsorbs and decomposes a non-target gas is provided in the sensor case 4 in order to improve selectivity to a target gas to be detected. A part of the gas sensor element 1 whose resistance value changes accordingly is configured.

The calculating means 6 receives the output signal of the gas sensor element 1 and calculates the resistance value of the gas sensor element 1, and the calculating means 6 calculates the reference resistance value of the gas sensor element 1 before the resistance change as the reference. First comparing means 7 for comparing the calculated current resistance value is provided. If the current resistance value is larger than the reference resistance value by a certain value or more as a result of the comparison by the first comparing means 7, the ventilation fan 8 is operated. Control means 9 is provided for sending an operation signal and sending a stop signal for stopping the operation of the ventilation fan 8 when the difference between the reference resistance value and the current resistance value is small.

Further, after the pollutant gas is detected by the gas sensor element 1 and the resistance value of the gas sensor element 1 fluctuates, the update rate is set so as to change the reference resistance value for a certain period of time. And a reference resistance value correcting means 10 for correcting the reference resistance value so that the reference resistance value approaches the current resistance value at a fixed time ratio. The reference resistance value correction means 10 corrects the reference resistance value. A second comparing means 11 for comparing the corrected resistance value with the current resistance value and sending a comparison result to the control means 9 is provided and configured.

The arithmetic means 6, first comparing means 7, control means 9, reference resistance correcting means 10, second comparing means 11
Is realized by the microcomputer 12.

The state in which the operation of the ventilation fan 8 is controlled in the above configuration will be described with reference to the flowchart of FIG.

First, in step 21, the gas sensor element 1
Is set, the current resistance value of the gas sensor element 1 is calculated in response to the output signal of the gas sensor element 1 after a lapse of a predetermined time in step 22, and the current resistance value calculated in step 23 is set in step 21. If the current resistance value is greater than a certain value as a result of comparison in step 23, the ventilation fan is operated in step 24, and if the current resistance value is not greater than a certain value as a result of comparison in step 23. While it is determined, the operation of the ventilation fan is stopped in step 25. Then, after a certain time after the ventilation fan has been operated in step 24, the reference resistance value is updated based on a constant update rate in step 26, and the corrected resistance value that is the corrected reference resistance value approaches the current resistance value, The corrected resistance value corrected in step 27 is compared with the current resistance value,
If the result of the comparison in step 27 is that the current resistance value is not larger than the correction resistance value by a certain amount or more, step 2
The operation of the ventilation fan is stopped in step 8, and as a result of the comparison in step 27, when the current resistance value is still larger than the correction resistance value by a certain value or more, the operation of the ventilation fan is continued in step 29, and after the ventilation fan is operated or stopped. Returns to step 22 and the ventilation fan is automatically operated again in the same steps.

As described above, according to the ventilation fan automatic operation device of the first embodiment of the present invention, the reference resistance value of the gas sensor element 1 is determined based on the constant update rate after the ventilation fan 8 has been operated for a predetermined time. The ventilation fan 8 is provided in the gas sensor element 1 after a certain period of operation since the operation of the ventilation fan 8 is stopped at an early stage by correcting the reference resistance value so as to approach the current resistance value. Even if the gas to be detected is re-emitted for a long time by the filter 5, the ventilation fan is not operated more than necessary.

(Embodiment 2) As shown in FIGS. 4 and 5, the reference resistance correction means 10A is connected to the reference resistance value for a predetermined time until the detection target gas in the indoor air is cleaned by ventilation. Is configured to reduce the update rate.

The state in which the operation of the ventilation fan is controlled in the above configuration will be described with reference to the flowchart of FIG.

It should be noted that the ventilation fan is a reference resistance value correcting means 10A.
The operation control in the state in which the correction is not performed is the same as that of the first embodiment, so that the description thereof will be omitted.

First, in step 31, for a predetermined time until the detection target gas in the indoor air is cleaned by ventilation.
An initial correction reference value corrected by reducing the update rate of the reference resistance value is set. In step 32, the initial correction reference value and the current resistance value are compared. As a result of the comparison in step 32, the current resistance value is initialized. When the value of the correction reference value is not larger than a predetermined value, the operation of the ventilation fan is stopped in step 33, and as a result of the comparison in step 32, when the current resistance value is larger than the value of the initial correction reference value by a certain value or more, the operation of the ventilation fan is stopped. In step 34, the process is continued.

After the operation of the ventilation fan has passed for a predetermined time, the reference resistance value is updated based on a constant update rate in step 35, and the corrected resistance value which is the corrected reference resistance value is changed to the current resistance value. The current resistance value is compared with the corrected resistance value corrected in step 36, and if the current resistance value is not larger than the corrected resistance value by a certain amount or more as a result of the comparison in step 36, the operation of the ventilation fan is stopped in step 37. And
As a result of the comparison in step 36, when the current resistance value is larger than the correction resistance value by a certain value or more, the operation of the ventilation fan is continued in step 38.

As described above, according to the automatic operation device for the ventilation fan according to the second embodiment of the present invention, the renewal rate of the reference resistance value is maintained for a predetermined time until the gas to be detected in the room air is cleaned by ventilation. So that the reference resistance value correcting means 10
Since the correction is performed by A, the current resistance value is compared with the initial correction reference value in which the reference value is hardly corrected until the indoor air is cleaned, and the current value from the filter provided in the gas sensor element portion is compared. It is not affected by the detection target gas, and the operation of the ventilation fan can be appropriately performed.

(Embodiment 3) As shown in FIG. 6, the reference resistance correction means 10B reduces the update rate of the reference resistance for a predetermined time until the gas to be detected in the air is cleaned by ventilation. Then, it is configured to be a time function.

In the above configuration, the state in which the operation of the ventilation fan is controlled is controlled as described with reference to the flowchart of FIG. 5 in the second embodiment.

As described above, according to the automatic operation device of the ventilation fan according to the third embodiment of the present invention, the renewal rate of the reference resistance value is maintained for a predetermined time until the detection target gas in the room air is cleaned by ventilation. Is reduced by the reference resistance correction means 10B which has been converted into a time function, so that the initial correction reference value and the current resistance value in which the reference value is hardly corrected until the indoor air is cleaned are different from each other. As a result, it is not affected by the detection target gas from the filter provided in the gas sensor element portion, and the operation of the ventilation fan can be appropriately performed.

(Embodiment 4) As shown in FIG. 7 and FIG. 8, a calculating means 6 for receiving the output signal of the gas sensor element 1 and calculating the resistance value of the gas sensor element 1; A first resistance comparing a reference resistance value before a resistance change serving as a reference with a current resistance value calculated by the calculation means 6;
If the current resistance is larger than the reference resistance by a certain value or more as a result of the comparison by the first comparator 7, an operation signal for operating the ventilation fan 8 is sent, and the reference resistance and the current resistance are compared. The control means 9A for sending a stop signal for stopping the operation of the ventilation fan 8 when the difference from the difference is small is provided.

After the control means 9A judges that the gas sensor element 1 has stopped, the current resistance correction means 40 corrects the current resistance value of the gas sensor element 1 with respect to the reference resistance value by the increased sensitivity value.
And a standby unit 41 that stands by with the current resistance value corrected by the current resistance value correction unit 40 is provided.

The computing means 6, the first comparing means 7, the control means 9A, the current resistance value correcting means 40, and the standby means 41 are realized by the microcomputer 12A.

A state in which the operation of the ventilation fan 8 is controlled in the above configuration will be described with reference to a flowchart of FIG.

First, in step 41, the reference resistance value of the gas sensor element is set. In step 42, the current resistance value of the gas sensor element is calculated by receiving the output signal of the gas sensor element after a certain period of time. The current resistance value is compared with the reference resistance value set in step 41. If the current resistance value is larger than a certain value as a result of the comparison in step 43, the ventilation fan is operated in step 44.
If it is determined that the current resistance value is not greater than a certain value as a result of the comparison in step 4, the operation of the ventilation fan is stopped in step 45.

Then, after the operation of the ventilation fan is stopped in step 45, the current resistance value of the gas sensor element with respect to the reference resistance value is corrected by the sensitivity increasing resistance value in step 46, and the corrected current resistance value is corrected in step 47. To make it easier to receive the output signal of the next gas sensor element.

As described above, according to the automatic operation device for the ventilation fan of the fourth embodiment of the present invention, after the ventilation fan 8 is determined to be stopped, the current resistance value of the gas sensor element 1 is determined by the current resistance value correction means 40. Since the standby is performed in a state corrected by the high-sensitivity resistance value, after the gas to be detected is once exhausted by the ventilation fan 8, the gas to be detected next generated can be caught sensitively, and after the ventilation fan 8 is stopped. The detection target gas can be reliably detected.

[0033]

As is clear from the above embodiment,
According to the present invention, a gas sensor element having a resistance value that changes in accordance with the contamination of indoor air, an operation unit that receives an output signal of the gas sensor element and calculates a resistance value of the gas sensor element, and the gas sensor element Control means for controlling the operation of the ventilation fan by comparing the reference resistance value before the resistance value change as the reference and the current resistance value calculated by the calculation means, and after the resistance value change of the gas sensor element, Since the reference resistance value correction means for correcting the current resistance value so that the current resistance value is approached at a fixed time ratio and compared and determined is provided, the gas to be detected is applied to the sensing element for a long time by the filter provided in the gas sensor element portion. It is possible to provide an automatic operation device of a ventilation fan that can prevent the ventilation fan from being operated for a longer time than necessary even in the case of re-release.

Further, the reference value correcting means reduces the renewal rate of the reference resistance value until the gas to be detected in the air is purified by the ventilation fan, so that the normal operation is performed when the gas to be detected is not re-emitted from the filter. The detection of the detection target gas in the air and the operation of the ventilation fan can be appropriately performed.

In addition, the reference value correction means reduces the update rate of the reference resistance value until the gas to be detected in the air is purified by the ventilation fan, and makes it a time function. When the gas is not released, the detection of the gas to be detected in the normal air and the operation of the ventilation fan can be appropriately performed.

Further, after the control means determines that the gas sensor element has stopped, the current resistance value correcting means for correcting the current resistance value of the gas sensor element with respect to the reference resistance value by the high sensitivity resistance value is provided.
Immediately after the operation of the ventilation fan stops, high-sensitivity detection is performed.
After the ventilation fan stops, the detection target gas can be detected more reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an automatic operation device for a ventilation fan according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a gas sensor element of the automatic operation device of the ventilation fan.

FIG. 3 is a flowchart showing the operation of the automatic operation device for the ventilation fan.

FIG. 4 is a block diagram illustrating a configuration of an automatic operation device for a ventilation fan according to a second embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the automatic operation device for the ventilation fan.

FIG. 6 is a block diagram illustrating a configuration of an automatic operation device for a ventilation fan according to a third embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of an automatic operation device for a ventilation fan according to a fourth embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the automatic operation device for the ventilation fan.

FIG. 9 is an exploded perspective view showing a configuration of a conventional gas sensor element.

FIG. 10 is a block diagram showing a configuration of an automatic operation device of the ventilation fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas sensor element 6 Calculation means 8 Ventilation fan 9 Control means 9A Control means 10 Reference resistance value correction means 10A Reference resistance value correction means 10B Reference resistance value correction means 40 Current resistance value correction means

Claims (4)

[Claims] A gas sensor element whose resistance value changes in accordance with the contamination of air in a room; an operation means for receiving an output signal of the gas sensor element and calculating a resistance value of the gas sensor element; Control means for controlling the operation of the ventilation fan by comparing the reference resistance value before the resistance value change as the reference and the current resistance value calculated by the calculation means, and after the resistance value change of the gas sensor element, An automatic ventilation fan provided with reference resistance correction means for updating the reference resistance based on a constant update rate and providing a reference resistance correction means for correcting the reference resistance and the current resistance closer to each other at a fixed time ratio and making a determination. Driving device. 2. The ventilation fan automatic driving device according to claim 1, wherein the reference value correction means is configured to reduce the update rate of the reference resistance value until the detection target gas in the air is cleaned by ventilation. . 3. The reference value correction means is configured to reduce the update rate of the reference resistance value during the time until the gas to be detected in the air is cleaned by ventilation, and to function as a time function.
An automatic operation device for the ventilation fan according to the above. 4. A gas sensor element whose resistance value changes according to contamination of air in a room, an operation means for receiving an output signal of the gas sensor element and calculating a resistance value of the gas sensor element, and the gas sensor element Control means for controlling the operation of the ventilation fan by comparing the reference resistance value before the resistance value change as the reference and the current resistance value calculated by the calculation means,
The current resistance value correction means for correcting the current resistance value of the gas sensor element with respect to the reference resistance value by the high-sensitivity resistance value after the control means determines that the ventilation fan has stopped, and the operation of the ventilation fan is stopped. Immediately after, the automatic operation device of the ventilation fan which was configured to perform high sensitivity detection.