JP3353318B2 - 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 a control device for an air purifier which detects dust and gas in the air by a gas sensor and automatically controls the operation.

[0002]

2. Description of the Related Art Conventionally, a control device of this kind of air purifier uses information such as a gas amount obtained from an output of a gas sensor.
When the gas concentration is high, a high suction force (hereinafter, referred to as HI) operation is performed for several minutes, and then, when the HI operation is completed, the weak suction force (hereinafter, referred to as LO) operation is fuzzy based on the information. The operating time was determined by selecting the table.

[0003]

However, in the above-described conventional air purifier control device, even if the gas amount is the same, some of them reach the level of the HI operation due to the difference in the sensitivity of the gas sensor. If the gas sensor that reaches the HI operation level is set to determine the operation time of HI and LO, if there is a gas sensor that does not reach the HI operation level, only the short-time LO operation is performed. As a result, there is a problem that the operation is stopped before dirt such as cigarettes cannot be removed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides an air purifier control device capable of determining an appropriate operation so that dirt can be completely removed even if the gas sensor sensitivity varies. With the goal.

[0005]

In order to achieve the above object, the present invention provides a gas sensor for detecting a gas amount, and a peak for detecting a time from an initial value of the gas sensor to a peak point when the gas sensor changes. Time detecting means, gas change amount detecting means for detecting a change amount of the gas amount detected by the gas sensor from an initial value to a peak value based on the gas amount, and output and gas amount of the peak time detecting means A fuzzy inference device for inferring the operation time of the fan motor from the output of the change amount detection means, and control means for driving the fan motor during the operation time inferred by the fuzzy inference device, wherein the fuzzy inference device is a gas sensor. The inference rule of the operation time is switched according to the value of the resistance value ratio at the time when the output reaches the peak .

[0006]

In the above configuration, when the output of the gas sensor reaches a peak, the fuzzy inference device switches the inference rule of the operation time according to the value of the resistance value ratio, and the operation time is fixed at the operation time determined by the fuzzy inference device. Because of the added time, a reliable fuzzy inference can be performed with a gas sensor of any sensitivity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the control device 1 of the air purifier comprises a gas sensor 2, a peak time detecting means 3, a gas amount change amount detecting means 4, a fuzzy inference unit 5, and a control means 6. Gas sensor 2
Is for detecting a gas amount and converting the magnitude of the gas amount into an electric signal as a change in resistance value. The peak time detecting means 3 detects the time from the initial value of the gas sensor 2 to the peak point at the time of change. The gas amount change amount detecting means 4 detects the time from the initial value of the gas amount detected by the gas sensor 2. The amount of change up to the peak value is detected based on the gas amount. The fuzzy inference unit 5 infers the operation time of the fan motor 7 from the output of the peak time detection means 3 and the output of the gas amount variation detection means 4, and the control means 6 controls the fan motor 7 during the estimated operation time. It is driven.

FIG. 2 shows the configuration of the fuzzy inference unit 5. That is, the fuzzy inference unit 5 is composed of various electronic circuits including a microcomputer.
A peak time conformity calculating means 9 for obtaining the degree of conformity with respect to the input from the peak time detecting means 3 and the membership function stored in the peak time membership function storing means 8 by taking MAX of both; A change amount adaptation calculating unit 11 for similarly obtaining an adaptation with respect to the input from the gas amount change amount detection unit 4 and the membership function stored in the gas amount change amount membership function storage unit 10; In accordance with the rules stored in the antecedent part minimum calculation means 12 and the driving time inference rule storage means 13, the antecedent part matching degree and the driving time membership function storage means 14 are used. The first consequent part minimum calculating means 15 which takes the MIN of the driving time membership function of the consequent part stored in It is composed of a minimum part calculating means 16 and a center-of-gravity calculating means 17 which obtains the respective conclusions for all the rules, takes the MAX of all the conclusions, calculates the center of gravity, and finally obtains the operation time. .

Next, the operation will be described. For example, when two people simultaneously smoke in a vehicle cabin and the air becomes contaminated with gas, the amount of change in the gas sensor 2 increases. The amount will be smaller. The time required for the gas amount to reach a peak varies depending on whether one cigarette is smoked or two cigarettes are smoked continuously. Therefore, it is possible to determine how to smoke in the vehicle cabin from the output of the gas sensor 2. When the amount of change in the gas amount and the time until the peak is reached are calculated by the peak time detecting means 3 and the gas amount changing amount detecting means 4 in this manner, the characteristics of the current state of the gas components in the air and the contamination are calculated. It is possible to estimate what the components are. Even if there is a similar gas component, a difference in the gas amount occurs if the sensitivity of the gas sensor 2 is different, so that the gas amount change amount does not reach when the gas amount change amount reaches a preset HI operation level. The optimal motor operation time is inferred by the fuzzy inference unit 5.

Next, the process of inferring the motor operation time will be described. In the fuzzy inference of this embodiment, the operation time is lengthened if the gas amount is large and the peak arrival time is long, and the operation time is shortened if the gas is small and the peak arrival time is short. However, the value of the consequent part is further determined based on the determination as shown in (Table 1) and (Table 2) depending on whether or not the gas amount change amount has reached the HI operation level. Change.

[0011]

[Table 1]

[0012]

[Table 2]

Here, qualitative concepts such as a longer peak arrival time, a small change in gas amount, and a very long motor operation time are quantitatively expressed by a membership function. You. In the fuzzy inference unit 5, the gas amount change amount matching degree calculating means 11 calculates the degree of matching with the input from the gas amount change amount detecting means 4 and the membership function stored in the gas amount change amount membership function storage means 10. I asked by taking the MAX of both,
The peak time matching degree calculating means 9 similarly calculates the matching degree with respect to the input from the peak time detecting means 3 and the membership function stored in the peak time membership function storing means 8, and The antecedent part minimum calculating means 12 takes the MIN of the two degrees of conformity as the degree of conformity of the antecedent part. In the first consequent part minimum operation means 15 and the second consequent part minimum operation means 16, the amount of change in the gas amount is HI.
Either is selected depending on whether the driving level has been reached,
According to the rules stored in the driving time inference rule storage means 13, the antecedent part fitness and the MIN of the suction power membership function of the consequent part stored in the driving time membership function storage means 14 are taken and the rules are taken. And conclude. After obtaining the respective conclusions for all the rules, the center of gravity calculating means 17 takes the MAX of all the conclusions,
The motor operation time is finally obtained by calculating the center of gravity. The control means 6 calculates and controls the operation time of the fan motor 7 based on the determined motor operation time.

As described above, according to the control device of the air purifier of the embodiment, the fuzzy inference device 5
Determines the operating time of the fan motor 6 by
Since the operation time of the LO operation is changed depending on whether or not the gas amount change amount has reached the HI operation level, an appropriate operation time can be determined even if the sensitivity of the gas sensor 2 varies.

FIG. 3 shows another embodiment, which is different from the above-described embodiment in that the second consequent part does not have the minimum calculating means 16 but the driving time correcting means 18 is provided. It is. According to this configuration, when the amount of change in the gas amount does not reach the HI operation level, the operation time correction means 18 adds a certain time to the operation time obtained by the center-of-gravity calculation means 17, so that an appropriate operation time can be set. In addition, the size of the control circuit can be reduced with a simple configuration.

In this embodiment, MA is included in the inference method.
Although the X-MIN synthesis method and the center of gravity method are used, other methods are also possible, and the suction power is expressed by a membership function in the consequent part, but it can also be expressed by a real value or a linear form. Not even.

[0017]

As is apparent from the above embodiment, the control device of the air purifier of the present invention detects a gas sensor for detecting the amount of gas, and detects the time from the initial value of this gas sensor to the peak point at the time of change. Peak time detecting means for detecting the amount of change in the gas amount detected by the gas sensor from an initial value to a peak value based on the gas amount; and the peak time detecting means. A fuzzy inference device for inferring the operation time of the fan motor from the output of the gas amount change amount detection means, and control means for driving the fan motor during the operation time inferred by the fuzzy inference device, The fuzzy inference device switches the inference rule of the operation time according to the value of the resistance ratio at the time when the output of the gas sensor reaches a peak. With this configuration, the sensitivity of the gas sensor is reduced. Even if variability can set the appropriate operating conditions, practical value is significant.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device of an air purifier according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a fuzzy inference device of the control device of the air purifier.

FIG. 3 is a configuration diagram of another fuzzy inference device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control device 2 Gas sensor 3 Peak time detecting means 4 Gas amount change amount detecting means 5 Fuzzy inference device 6 Control means 7 Fan motor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 46/46 B01D 53/30

Claims (2)

(57) [Claims] 1. A gas sensor for detecting a gas amount, a peak time detecting means for detecting a time from an initial value of the gas sensor to a peak point at the time of change, and an initial value of a gas amount detected by the gas sensor. Gas change amount detecting means for detecting a change amount from the peak value to the peak value by the gas amount, and inferring the operation time of the fan motor from the output of the peak time detecting means and the output of the gas amount change amount detecting means. And a control means for driving the fan motor during the operation time inferred by the fuzzy inference device, wherein the fuzzy inference device has a resistance value ratio when the output of the gas sensor reaches a peak. Control device for switching the inference rule of the operation time according to the value of 2. A gas sensor for detecting a gas amount, and a gas sensor for detecting a gas amount.
Detect the time from the initial value of the sensor to the peak point at the time of change
Peak time detecting means and the gas sensor
The change from the initial value of the gas amount to the peak value
Therefore, the gas change amount detecting means for detecting the gas and the peak time
From the output of the detecting means and the output of the gas amount change amount detecting means,
A fuzzy inference device for inferring the operation time of the fan motor;
During the operation time inferred by the fuzzy inference
Control means for driving a fan motor, wherein the fuzzy inference unit adds a fixed time according to the value of the resistance value ratio when the output of the gas sensor reaches a peak.
A control device for an air purifier having an operation time correction means for the air purifier.