JP3399188B2 - Air purifier control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of an air cleaner by a gas sensor.

[0002]

2. Description of the Related Art Conventionally, in this type of control device, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 0-27849, the minimum value of the gas sensor output in a predetermined sampling period is used as a reference output corresponding to clean air, and the pollution of the atmosphere is detected by the relative value with this output. By doing so, it is possible to avoid the influence of the fluctuation of the sensor's daily difference or the fluctuation of the sensor output unrelated to the air pollution due to the temperature and humidity. Also, the work of adjusting the sensitivity for each individual sensor is not necessary.

Further, in the control for stopping the air purifier, as shown in Japanese Utility Model Publication No. 5-26416, the output decrease detecting means and the gas sensor output by the relative value for detecting the decrease in the gas sensor output. The air purifier is stopped by one of the outputs of the saturation detecting means for detecting that the change of the above is less than a predetermined value.
By doing so, it is possible to appropriately stop the air purifier not only when the gas is actually removed but also when the output of the gas sensor is saturated and no new gas is generated.

[0004]

As described above, the conventional device is mainly controlled by the relative value. However, if it is used in a place where there is a possibility of chronic pollution of the atmosphere, such as Jean Zhuang or a room intended for smoking, the degree of pollution of the atmosphere becomes chronically high, and the saturation of the output of the gas sensor may be detected. However, there is a problem that the blower is erroneously stopped by detecting a decrease in the output of the gas sensor due to a slight decrease in the pollution source.

The present invention has been made to solve the above problems, and when the atmosphere is polluted even when it is used in a place where the degree of pollution of the atmosphere is chronically high,
An object of the present invention is to obtain an air purifier control device capable of performing appropriate stop control without the blower accidentally stopping.

[0006]

A control device for an air purifier according to the present invention samples an output of a gas sensor for detecting contamination of an atmosphere in a predetermined period, and uses a minimum value of the gas sensor output as a reference output. The air conditioner is memorized and the blower is operated when it detects that the gas sensor output has increased by more than a predetermined value with respect to the reference output .
Low output to detect that the gas sensor output has dropped
Lower detection means and change in gas sensor output during operation are within a specified value
And a saturation detection means for detecting the following
In an air purifier controller, an absolute gas sensor
The output level judgment means for judging the output level of
Either the output drop detecting means or the saturation detecting means
At the output and the output of the output level discrimination means it is obtained so as to stop the blower.

Further, a sensitivity switching means for changing the predetermined value of the output level judging means is provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. An embodiment of the present invention will be described below with reference to the functional block diagram of FIG. Here, the control on the stop side of the blower is illustrated. A known technique is applied to the control on the driving side.
In the figure, reference numeral 1 is a gas sensor for detecting contamination of the atmosphere, and this detection may use either electrical conductivity or resistance value. 2 is an output drop detecting means for detecting that the output of the gas sensor 1 is lowered into the OPERATION, the reference output and the current of the gas sensor output, relatively detected from such as sensitivity set value.

[0009] 3 is a saturation detection means for determining that the change in the output of the gas sensor 1 in the OPERATION is less than a predetermined value, sampling the sensor output at predetermined intervals, it is substantially increased gas concentration If there is no state, or if the difference or the ratio thereof is smaller than a certain predetermined value, it is considered to be saturated if it continues for a predetermined period. 4 is the output level determining means for determining that the output level of the gas sensor 1 is equal to or higher than a predetermined value during OPERATION, and the comparison absolute value of the current of the gas sensor output level and the preset predetermined value, The result is output.

Reference numeral 5 will be described later based on the results of the output drop detecting means 2 , the saturation detecting means 3 and the output level judging means 4 .
The blower control means 6 for controlling the blower 7 is a sensitivity switching means, and when the high-sensitivity side is selected, the blower 7 starts operation and cleans the air even if the output of the gas sensor 1 increases slightly. Further, once the operation is started, the condition for stopping the blower 7 becomes severe, and the operation is continued for a longer time. Reference numeral 7 denotes an air purifier of the air purifier, which adjusts the air purifying ability by switching the rotation speed according to a signal from the blower control means 5.

FIG. 2 is an electric circuit diagram showing the functional block diagram of FIG. In the figure, reference numeral 1 is a gas sensor for detecting contamination of the atmosphere, and the resistance value changes depending on the degree of contamination. This change is output to the A / D conversion circuit 8 as analog data. This output is high when the pollution level is high,
The lower the pollution level, the lower the output. The A / D conversion circuit 8 is a circuit for converting analog data from the gas sensor 1 into digital data and inputting the digital data into the microcomputer 9, and may be included in the function of the microcomputer 9. These and the functions of the microcomputer 9 are combined to operate as the output drop detection means 2, the saturation detection means 3, the output level determination means 4, and the blower control means 5. A driver 10 receives the output of the microcomputer 9 and drives the blower 7. The microcomputer 9 changes the predetermined values of the output level judging means 4 , the output drop detecting means 2 and the saturation detecting means 3 which have been set in advance, according to the input signal of the sensitivity changeover switch 6a.

Next, the operation of the control device having the above configuration will be described based on the flowchart of FIG. First, in steps 20 and 21, the output of the gas sensor 1 and the setting of the sensitivity changeover switch 6a are read. These readings do not have to be performed every time, and may be set at appropriate fixed intervals. Next, in step 22, when the blower 7 is not operating, that is, when the pollution of the atmosphere is not detected, the pollution detection (step 23) is performed, and when the pollution is not detected, the process returns to step 20 again, and Repeat the operation.

In the method of detecting contamination, when the output of the gas sensor 1 increases by a predetermined value or more with respect to the reference output, it is regarded as contamination. By controlling with the relative value in this way, it is possible to avoid the influence of the fluctuation of the gas sensor 1 due to the day difference or the fluctuation of the sensor output irrelevant to the air pollution due to the temperature and humidity.
Also, the work of adjusting the sensitivity for each individual sensor is not necessary. Further, the sensitivity at which the blower 7 operates can be switched by changing a predetermined value by setting the sensitivity selector switch 6a. When the atmosphere is polluted and the output of the gas sensor 1 becomes high and increases by a predetermined value or more with respect to the reference output, the change is detected in step 23 and the operation of the blower 7 is started (step 26).

When the blower 7 is operated by detecting the contamination,
In step 22, the process branches to output reduction detection (step 24). In the method of detecting the output drop, when the output of the gas sensor 1 approaches the reference output by a predetermined value or less, it is considered that the output has dropped. Next, in step 25, saturation detection is performed. In the saturation detection method, the sensor output is sampled at a predetermined interval, and when the difference or ratio of the sensor outputs is smaller than a predetermined value for a predetermined period, the sensor output is regarded as saturated. Also here, the sensitivity at which the blower 7 is stopped can be switched by changing the respective predetermined values by setting the sensitivity changeover switch 6a.

In the above steps 24 and 25, when either the decrease or the saturation of the output is detected, the process branches to the output level judgment. In the output level determination, the absolute value of the gas sensor output level when either the decrease or the saturation of the output is detected is compared with a preset predetermined value (step 28) to determine the absolute value of the gas sensor output level. When it is below the value, the operation of the blower 7 is stopped (step 2).
9). Here, the level at which the blower 7 is stopped can be switched by changing the predetermined value by setting the sensitivity changeover switch 6a (step 27). When the absolute value of the gas sensor output level is equal to or higher than the predetermined value, the operation process of the blower 7 (step 26) is continued.

As described above, the output of the output decrease detecting means 2 for detecting the decrease of the output of the gas sensor 1 or the output of the saturation detecting means 3 for detecting that the change of the output of the gas sensor 1 is below a predetermined value. Since the blower 7 is stopped when the output of the output level determining means 4 for determining whether or not the output of the gas sensor 1 is equal to or more than a predetermined value at any time, the atmosphere is chronically changed. Even when used in an automatic operation by the gas sensor 1 in a place where contamination is likely to occur, for example, a jean villa or a room intended for smoking, there is a problem that the blower 7 is accidentally stopped even if the air is dirty. In addition, there is an effect that a highly reliable air purifier can be obtained.

Next, the time chart of FIG. 4 shows the relationship between the saturation detection and the operation of the blower 7 . 4a is the output of the gas sensor 1 , FIG. 4b is the operation of the blower 7 when the predetermined value of the output level determination is Lo, and c of FIG. 4 is the predetermined value of the output level determination is Hi. It is a figure which shows operation | movement of the blower 7 when it does. Here, the predetermined value Lo or Hi is the sensitivity switching means 6
Set by. When saturation of the gas sensor output is detected at point S in FIG. 4a, the blower 7 continues to operate because the gas sensor output level is higher than the predetermined value Lo in FIG. 4b. In c of FIG. 4, since the gas sensor output level is lower than the predetermined value Hi, the blower 7 is stopped.

In this way, the sensitivity switching means 6 switches the sensitivity according to the user's preference and the place of use, so that optimum stop control can be performed.

[0019]

As described above, according to the present invention, the output decrease detecting means for detecting the decrease of the output of the gas sensor during operation, and the change of the output of the gas sensor during operation are less than a predetermined value. In the control device of the air purifier provided with the saturation detection means for detecting, the output level determination means for determining the absolute output level of the gas sensor is provided, and either the output decrease detection means or the saturation detection means is provided. Since the blower is stopped by that output and the output of the output level determination means, when the output level is equal to or higher than a predetermined value, the blower operation is not stopped even after the saturation is detected, so that the atmosphere is chronically polluted. Even when used with automatic operation with a gas sensor in a place where is likely to occur, such as Jean Zhuang or a room intended for smoking, even if the air is dirty, No problems such as would stop, there is an effect that high air purifier reliability.

Further, since the predetermined value of the output level judging means can be changed by the sensitivity switching means, the setting can be made in accordance with the preference of the user and the condition of the room, and the usability is improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a control device for an air purifier according to the present invention.

FIG. 2 is an electric circuit diagram of a control device for an air cleaner according to the present invention.

FIG. 3 is a control flowchart of the control device of the air purifier according to the present invention.

4 is a time chart showing the relationship between the detection of gas sensor output saturation and blower operation according to the present invention, FIG.
Shows the output of the gas sensor, and b and c of FIG. 4 show the operation of the blower when the predetermined values for the output level determination are Lo and Hi.

[Explanation of symbols]

1 gas sensor, 2 output drop detection means, 3 saturation detection means, 4 output level determination means, 5 blower control means,
6 sensitivity switching means, 6a sensitivity switching switch, 7 blower, 8 A / D conversion circuit, 9 micro computer,
10 drivers.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-17912 (JP, A) JP-A-2-160018 (JP, A) JP-A-3-30815 (JP, A) JP-A-63- 178865 (JP, A) JP-A-2-83014 (JP, A) JP-A-61-205738 (JP, A) JP-A-5-96943 (JP, A) Actual development Sho-63-189348 (JP, U) Japanese Patent Publication 6-7897 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 46/46 F24F 7/00

Claims (2)

(57) [Claims] 1. The output of a gas sensor for detecting contamination of an atmosphere is sampled for a predetermined period, the minimum value of the gas sensor output is stored as a reference output, and the gas sensor output is increased by a predetermined value or more with respect to the reference output. together detect and to operate the blower that, moths while driving
Output reduction to detect that the sensor output has decreased
The change in the detection means and the gas sensor output during operation is less than a specified value.
And a saturation detection means for detecting that it is below
In an air purifier controller, the absolute gas sensor
An output level judging means for judging the output level is provided.
Either the output drop detecting means or the saturation detecting means
An air purifier control device , wherein a blower is stopped by an output and an output of the output level determination means . 2. The control device for an air cleaner according to claim 1, further comprising sensitivity switching means for changing a predetermined value of the output level determining means.