JPH04190827A - Control apparatus of air purifier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an air cleaner that detects air pollution and purifies the air depending on the air pollution.

Conventional technology In recent years, air purifiers have become widely used to improve the indoor environment, and devices that use gas sensors to detect air pollution and operate automatically have appeared. .

Conventionally, a control device for this type of air cleaner was generally as shown in FIG. That is, using a gas sensor 1 whose resistance value changes depending on the gas concentration, the detection means 2 detects the degree of air pollution from the amount of change in the resistance value of the gas sensor 1, and inputs this signal to the control means 3 to determine the detection level. The fan motor 4 was driven in response to the air purification. In addition, the gas sensor 1 is such that the amount of change in resistance value increases depending on the gas concentration, and the control means 3 sets the resistance value at a certain gas concentration (air that is considered to be clean) to a reference resistance value R0.
With respect to this value, the degree of air pollution is determined and output from the amount of change in the resistance value H at the current gas concentration.

Problems to be Solved by the Invention In such a conventional air purifier control device, as shown in FIG. 6, the output value of the gas sensor 1 changes in a transient response (IZ -t.

Therefore, when the air volume of the fan motor 4 changes, the air flow around the gas sensor changes, and the output level of the gas sensor 1 changes. Judging air pollution based on the value often leads to incorrect judgments and poor detection accuracy.

The present invention solves the above problem, and detects the output value in a stable state by not determining the degree of air pollution based on the output of the gas sensor until the output level of the gas sensor is stabilized, thereby achieving high reliability. The purpose of the present invention is to provide a control device for an air purifier.

Means for Solving the Problems A first means for solving the problems of the present invention for achieving the above object includes a gas sensor that detects air pollution, a switch that opens and closes the output of this gas sensor, and a switch that opens and closes the output of the gas sensor. A detection means for detecting the output level of the gas sensor, a reference storage means for storing a resistance value serving as a reference for gas contamination, and signals output from the reference storage means and the detection means are inputted to determine the degree of air pollution. a first control means that changes the output based on the signal output from the comparison means; an air volume detection means that detects a change in the air volume caused by the fan; a timer that receives input and operates for a certain period of time; and a second timer that operates the switch to open and close based on the output of this timer.
The second problem-solving means includes a gas sensor for detecting air pollution, a detection means for detecting the output level of this gas sensor, and a switch for switching the output destination of this detection means. a switch, a change storage means for storing a change in the output level of the gas sensor which is an output destination of one of the changeover switches, and a reference storage means for storing a resistance value serving as a reference for gas contamination. , a comparison means for inputting the signals outputted from the reference storage means and the detection means and determining the degree of air pollution, a control means for changing the output based on the signal outputted from the comparison means, and an air volume by the fan. an air volume detection means for detecting a change in the output of the gas sensor;
A third problem-solving means is provided with a changeover means for operating the changeover switch according to the outputs of the change amount detection means, the air flow rate detection means, and the change amount storage means. A gas sensor that detects dirt, and a detection means that detects the output level of this gas sensor.

A reference storage means for storing a resistance value as a reference for gas contamination, an air volume detection means for detecting a change in air volume due to the fan, and a correction value storage for outputting a correction value based on the output of the air volume detection means. a correction means for inputting the outputs of the correction value storage means and the detection means and performing correction processing;
The apparatus is equipped with a comparison means for inputting the output signals of the correction means and the reference value storage means and determining the degree of air pollution, and a control means for changing the output based on the signal output from the comparison means. .

Operation The first problem-solving means described above stores a resistance value as a reference for gas contamination in the reference storage means, and the gas sensor detects air contamination and inputs the detected value to the switch.

The air volume detection means detects the change in air volume caused by the fan, inputs the output to the timer, inputs it to the switch after the gas sensor becomes stable, and inputs it to the detection means when it is closed, and from the reference storage means and the detection means. The output signal can be input to the comparison means to determine the degree of air pollution, and the output can be changed by the control means based on the signal output from the comparison means. The operation is such that a resistance value serving as a reference for gas contamination is stored in the reference storage means, the gas sensor detects air contamination and inputs it to the detection means, and its output is input to the changeover switch.

The change amount storage means stores the value of the output level of the gas sensor immediately before the fan air volume changes, and switches after the gas sensor output level after the fan air volume changes becomes the same level as the value before the fan air volume change. The switching operation can be performed by the input of the means, and furthermore, the action of the third problem solving means is to change the transient response curve of the output value of the gas sensor due to the change in the fan air volume from the change state of the output level of the gas sensor immediately before the fan air volume changes. is derived and stored in the correction value storage means, and this output is input to the correction means to determine the degree of air pollution.

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

FIG. 1 shows an embodiment related to the first problem-solving means of the present invention.

As shown in the figure, a switch 6 opens and closes the output of a gas sensor 7 that detects air pollution, and a detection means 8 detects the output level of the gas sensor γ. Reference storage means 9
Then, the resistance value as a reference for gas contamination is stored in advance, and the signals output from the reference storage means 9 and the detection means 8 are input to the comparison means 1Q to judge the degree of air contamination, and based on this judgment. The rotation of the fan 12 is controlled by inputting it to the first control means 11. The air volume detection means 13 detects changes in the air volume of the fan 12, and inputs this output signal to the timer 14.
The second control means 15 is operated by the output.

To explain the operation in the above configuration, when the power is turned on, the air volume detection means 13 first detects whether the air volume of the fan 12 has changed, and when it is confirmed that the air volume of the fan 12 has not changed, the is sent to the timer 14, and the timer 14 that receives this signal remains inactive. Since the timer 14 is not operating, a closing signal is sent from the second control means 16 to the switch 6, and the switch 6 is closed. As a result, the signal output from the gas sensor 7 is input to the detection means 8 and is input as the current resistance value R to the comparison means 1o. Then, it is compared with the reference resistance value R0 stored in the reference storage means 9 to determine the degree of air pollution. Based on this judgment result, fan 1-2-
The first control means 11 sends a control signal to the motor for the fan 12 so that the motor for the fan 12 rotates. At this time, the air volume detection means 13 continues to detect changes in the air volume of the fan 12.

In this state, when the air volume of the 7-an 12 changes and the air volume detection means 13 detects a change in the air volume, it notifies the timer 14 of the detection. Upon receiving this signal, the timer 14 operates only until the output level of the gas sensor 7 stabilizes after the air volume of the fan 12 changes. While the timer 14 is operating, a control signal to open the switch 6 is sent from the second control means 15, and the output signal of the gas sensor 7 is not input to the detection means 8 during this time. During this period, the detection means 8
By continuing to output the resistance value immediately before the air volume change, the determination of air pollution becomes stable. In addition,
During the operation period of the timer 14, a configuration may be adopted in which the signal from the detection means 8 is not received and the air volume of the fan 12 is not changed.

FIG. 2 shows an embodiment of the second problem-solving means of the present invention. In each figure, the same parts as those in FIG. 1 are denoted by the same numbers, and their explanations will be omitted. In the embodiment according to the first problem solving means described above, a change in the air volume of the fan 12 is detected and the timer 14 is activated, but in this embodiment, the output of the gas sensor 7 immediately before the air volume of the fan 12 changes. The level is memorized, and the degree of air pollution is judged based on the output value of the gas sensor until the output level of the gas sensor 7 after the air volume of the fan 12 changes becomes the same level as the value before the air volume of the fan 12 changes. I tried to avoid it.

That is, the control device of this embodiment is connected to a switch 16 for switching the output destination of the detection means 8, and one output destination of the changeover switch 16 is connected in parallel with the comparison means 1o, and the output resistance value from the detection means 8 is Change amount storage means 17 that stores the amount of change, change amount detection means 18 that detects the amount of change in the output value at the other output destination of the changeover switch 16, and air volume detection means 13.
, a change amount storage means 17 and a change amount detection means 18 .

The operation of the above configuration will be described. First, when the power is turned on, the selector switch 16 is switched to the comparison means 10° variation storage means 17 side. The output value of the gas sensor 7 detected by the detection means 8 is inputted to the comparison means 1o as the resistance value R, and is inputted to the change amount storage means 17 as the minute time change amount ΔR.
is input.

The resistance value R input to the comparison means 10 is compared with the reference resistance value RQ stored in the reference storage means 9 in advance by the comparison means 1o. The amount of change in resistance value that changes the air volume of the fan 12 according to the judgment of the degree of air pollution at this time is stored. What has been described above is that the air volume detection means 13 is the fan 12.
This continues until a change in air volume is detected. Air volume detection means 1
3 detects a change in air volume, it notifies the switching control means 19 of the detection, and upon receiving this signal, the switching means 19 switches the output destination of the changeover switch 16 to the change amount detection means 18 side. When the changeover switch 16 is switched, the comparison means 1o stops comparing with the reference resistance value R0 and continues to output the degree of air pollution immediately before the air volume of the fan 12 changes.

The change amount storage means 17 also stores the change amount ΔR immediately before the air volume change of the fan 12, and continues to hold the change amount ΔR. During this time, the change amount detection means 18, which inputs the output resistance value from the detection means 8, reads the change amount Δr in the resistance value and outputs Δr to the switching means 19. The switching means 19 includes a fan 12
The amount of change in resistance value ΔR immediately before the change in air volume is stored in the amount of change storage means 1.
7, the amount of resistance change Δτ after the change in air volume of the fan 12 is inputted from the change amount detection means 18, and ΔR and Δr
This state is repeated until the values are almost at the same level. ΔR and Δr are almost at the same level, and the gas sensor 7 is connected to the fan 12.
When it is determined that there is no longer any effect on changes in air volume,
The changeover switch 16 also serves as the comparison means 10. When the variation storage means 1 is switched to the final side, the degree of air pollution is determined according to the output value of the gas sensor 7.

In this way, due to the change in the air volume of the fan 12,
The configuration is such that the degree of air pollution is not determined according to the output value of the gas sensor 7 while the output value of the gas sensor 7 temporarily fluctuates.

FIG. 3 shows an embodiment of the third problem-solving means of the present invention. In each figure, the same parts are denoted by the same numbers as in FIG. 1, and the explanation thereof will be omitted.

The characteristic configuration of this embodiment is that even while the output value of the gas sensor 7 temporarily fluctuates due to a change in the fan air volume,
The degree of air pollution is determined according to the output value of the gas sensor 7.

In the figure, reference numeral 19 indicates a correction value storage means that outputs a correction value based on the value detected by the air volume detection means 13, and 2o indicates a gas sensor 7 that inputs signals output from the detection means 8 and correction value storage means 19 and responds to changes in air volume. This is a correction means for correcting fluctuations in the output value of.

In the above configuration, the content of changes in the output level will be explained with reference to FIG. 4. When the degree of air pollution is in the state of ■, when the air volume of the fan 12 changes as shown in ■, the air volume detection means 13 detects this and transmits it to the correction value storage means 19. Receiving this signal, the correction value storage means 19 selects and outputs one of the already stored correction values in accordance with the signal REP. At this time, the output value from the gas sensor 7 changes in a transient response manner via the detection means 8 as shown in (3).

The correction means 20 to which the output value ■ of the detection means 8 and the corrected output value ■ of the correction value storage means 19 are inputted is the output value of the gas sensor 7 which removes the variation due to the change in the air volume of the fan 12 as shown in ■. As a result, the degree of contamination of the air can always be determined according to the output value of the gas sensor 7, regardless of variations in the output of the motor of the fan 12.

Effects of the Invention As is clear from the above description of the embodiments, the air purifier control device of the present invention includes a gas sensor that detects air pollution, a switch that opens and closes the output of this gas sensor,
A detection means for detecting the output level of the gas sensor via this switch, a reference storage means for storing a resistance value serving as a reference for gas contamination, and a signal output from the reference storage means and the detection means. a first control means for changing the output based on a signal output from the comparison means;
It includes an air volume detection means for detecting a change in the air volume caused by the fan, a timer that receives an output signal from the air volume detection means and operates for a certain period of time, and a second control means that opens and closes the switch based on the output of the timer. Therefore, the degree of air pollution is not judged until the output level of the gas sensor is stabilized, and the output value in a stable state can be detected and judged, thereby improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a control device for an air purifier according to an embodiment of the first problem-solving means of the present invention, and FIG. 2 is a block circuit diagram of a control device related to the second problem-solving means of the present invention.
Fig. 3 is a block circuit diagram of a control device related to the third problem solving means, Fig. 4 is a characteristic diagram showing the passage of time and output changes at each location in the third problem solving means, and Fig. 6 is a conventional example. Block circuit diagram of the air purifier control device, No. 6
The figure is a diagram showing the passage of time and changes in output values by the gas sensor of the same control device. 6... Switch, γ... Gas sensor,
8...User test means, 9...Reference storage means, 1
0... Comparison means, 11... First control means, 12-... Fan, 13... Air volume detection means, 14... Timer ~, 16...
- Second control means. Name of agent: Patent attorney Akira Okaji and two others
To Castle Figure 4 Figure 5

Claims (3)

[Claims] (1) a gas sensor that detects air pollution, a switch that opens and closes the output of this gas sensor, and a detection means that detects the output level of the gas sensor via this switch;
a reference storage means for storing a resistance value serving as a reference for gas contamination; a comparison means for inputting signals output from the reference storage means and the detection means to determine the degree of air contamination; a first control means that changes the output based on the output signal; an air volume detection means that detects a change in the air volume caused by the fan; a timer that operates for a certain period of time by inputting the output signal of the air volume detection means; A control device for an air purifier, comprising: second control means for opening and closing the switch according to the output of a timer. (2) A gas sensor that detects air pollution, a detection means that detects the output level of this gas sensor, a changeover switch that changes the output destination of this detection means, and an output of the gas sensor that is one of the output destinations of this changeover switch. A change amount storage means that stores the amount of change in level, a reference storage means that stores a resistance value serving as a reference for gas contamination, and signals output from this reference storage means and the detection means are inputted. a comparison means for determining the degree of air pollution; a control means for changing the output based on a signal output from the comparison means; an air volume detection means for detecting a change in the air volume caused by the fan; and the other output of the changeover switch. a change amount detection means for detecting the amount of change in the output of the gas sensor, and a switching means for switching the changeover switch according to the outputs of the change amount detection means, the air volume detection means, and the change amount storage means. Equipped with an air purifier control device. (3) A gas sensor that detects air contamination, a detection means that detects the output level of this gas sensor, a reference storage means that stores a resistance value that is a reference for gas contamination, and a fan that detects changes in air volume. a correction value storage means for outputting a correction value based on the output of the airflow detection means; a correction means for inputting the outputs of the correction value storage means and the detection means for correction processing; control means for an air purifier, comprising a comparison means for inputting the output signal of the reference value storage means and determining the degree of air pollution, and a control means for changing the output based on the signal output from the comparison means. Device.