JPH05192532A - Control device of air purifier - Google Patents

Abstract

PURPOSE:To set a proper operation condition even when irregularity is generated in the sensitivity of a gas sensor by changing over the inference rule of an operation time from the value of a resistance value ratio at the point of time when the output of the gas sensor reaches a peak by a fuzzy inference device. CONSTITUTION:An amount of gas is detected by a gas sensor 2 and the magnitude of the amount of the gas is converted to an electric signal as the change of a resistance value but the time from the initial value of the gas sensor 2 to a peak point at the time of a change is detected by a peak time detecting means 3. The change quantity of the amount of the gas is calculated by a gas amount change quantity detecting means and the operation time of a fan motor 7 is inferred on the basis of the outputs of both means 3, 4 by a fuzzy inference device 5 and the fan motor 7 is driven by a control means 6.

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 for this type of air purifier uses information such as the amount of gas obtained from the output of a gas sensor.
When the gas concentration is high, how long a strong suction force (hereinafter referred to as HI) operation is performed, and when the HI operation is finished after that, based on the above information, a weak suction force (hereinafter referred to as LO) operation is called fuzzy. The driving time was decided by the selection of the table.

[0003]

However, in the above conventional air purifier control device, even if the gas amount is the same, some of them reach the HI operation level due to the difference in the sensitivity of the gas sensors, but some of them do not. If there is a gas sensor that reaches the level of HI operation and the operating time of HI and LO is determined, if there is a gas sensor that does not reach the level of HI operation, only short-time LO operation is performed. Therefore, there was a problem that the operation was stopped before the dirt such as cigarettes could be removed.

The present invention solves the above-mentioned conventional problems, and provides a controller for an air purifier that can determine an appropriate operation so that dirt can be completely removed even if there is a variation in gas sensor sensitivity. 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 at the time of change. Time detection means, gas amount change amount detection means for detecting the change amount from the initial value of the gas amount detected by the gas sensor to the peak value by the gas amount, the output of the peak time detection means and the gas The fuzzy reasoner includes a fuzzy reasoner that infers the operating time of the fan motor from the output of the amount change detecting means, and control means that drives the fan motor during the operating time inferred by the fuzzy reasoner. When the output of the gas sensor reaches the peak, the inference rule of the operating time is switched according to the value of the resistance value ratio, and another fuzzy reasoner is that the output of the gas sensor reaches the peak. The value of the resistance value ratio of the point, in which adding a predetermined time to the operating time determined by the fuzzy inference unit.

[0006]

In the above structure, when the output of the gas sensor reaches the 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. Since the time is added, reliable fuzzy inference can be performed by a gas sensor of any sensitivity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, an air purifier control device 1 is composed of a gas sensor 2, a peak time detecting means 3, a gas amount change amount detecting means 4, a fuzzy reasoner 5 and a control means 6. Gas sensor 2
Detects the amount of gas and converts the amount of gas 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, and the gas amount change amount detecting means 4 detects the peak value from the initial value of the gas amount detected by the gas sensor 2. The change amount up to the threshold value is detected by the gas amount. The fuzzy reasoner 5 deduces the operating time of the fan motor 7 from the output of the peak time detecting means 3 and the output of the gas amount change amount detecting means 4, and the control means 6 operates the fan motor 7 during the inferred operating time. It is driven.

FIG. 2 shows the configuration of the fuzzy reasoner 5. That is, the fuzzy reasoner 5 is composed of various electronic circuits including a microcomputer.
A peak time fitness calculation means 9 for obtaining the fitness from the peak time detection means 3 and the membership function stored in the peak time membership function storage means 8 by taking the MAX of both. A change amount adaptability calculating unit 11 for similarly obtaining an adaptability with respect to the input from the gas amount change amount detecting unit 4 and the membership function stored in the gas amount change amount membership function storage unit 10, and the two adaptability levels. According to the rule stored in the antecedent part minimum calculating means 12 which takes the MIN of the antecedent part as the adaptability part and the driving time inference rule storage means 13, the antecedent part conformance and the driving time membership function storage means 14 The MIN of the driving time membership function of the consequent part stored in the above is taken as the conclusion of the rule. It is composed of a subject part minimum calculating means 16 and a center of gravity calculating means 17 which finally obtains the operating time by obtaining the MAX of all the conclusions after obtaining the respective conclusions for all rules. ..

Next, the operation will be described. For example, if two people smoke a cigarette at the same time in the vehicle and the air is contaminated with gas, the change amount of the gas sensor 2 becomes large, and when one person puts a cigarette and the pollution is small, the gas sensor 2 changes. The amount becomes smaller. In addition, the time until the amount of gas reaches the peak changes depending on whether one smokes or two smokes continuously. Therefore, it is possible to determine how to smoke the cigarette in the vehicle from the output of the gas sensor 2. In this way, when the amount of change in the gas amount and the time required to reach the peak are calculated by the peak time detecting means 3 and the gas amount change amount detecting means 4, the characteristics of the state of the gas component in the current air and contamination are calculated. One can deduce what the ingredients are. And even if there is a similar gas component, the amount of change in the amount of gas will differ if the sensitivity of the gas sensor 2 is different, so that the amount of change in the amount of gas does not reach when it reaches the preset HI operation level. The fuzzy reasoner 5 infers the optimum motor operating time from the time.

Next, the process of inferring the motor operating time will be described. The fuzzy reasoning of this embodiment is such that if the gas amount is large and the peak arrival time is long, the operation time is lengthened, and if the gas is small and the peak arrival time is short, the operation time is shortened. However, depending on whether the amount of change in the gas amount has reached the HI operating level, the values in the consequent part are based on the judgments shown in (Table 1) and (Table 2). Change.

[0011]

[Table 1]

[0012]

[Table 2]

Here, a qualitative concept that the peak arrival time is "long", the amount of change in the gas amount is "small", or the motor operating time is "very long" is quantitatively expressed by a membership function. It In the fuzzy inference unit 5, the gas amount change amount adaptability calculating means 11 calculates the adaptability to 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. Obtained by taking the MAX of both,
Further, the peak time fitness calculating means 9 similarly obtains the fitness 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. In the antecedent part minimum calculating means 12, the MIN of the two conformances is taken as the adaptability of the antecedent part. In the first consequent part minimum calculating means 15 and the second consequent part minimum calculating means 16, the change amount of the gas amount is HI.
Either is selected depending on whether or not the driving level is reached,
According to the rule stored in the driving time inference rule storage means 13, the MIN of the antecedent part suitability and the consequent suction power membership function stored in the driving time membership function storage means 14 is taken and the rule is taken. To conclude. After obtaining the respective conclusions for all the rules, the centroid calculating means 17 takes the MAX of all the conclusions,
The motor operating time is finally obtained by calculating the center of gravity. The control means 6 calculates and controls the operating time of the fan motor 7 based on the determined motor operating time.

As described above, according to the control device of the air purifier of the embodiment, the fuzzy reasoner 5 is detected from the detection value of the gas sensor 2.
The operating time of the fan motor 6 is determined by
Since the operating time of the LO operation is changed depending on whether or not the amount of change in the gas amount has reached the HI operating level, an appropriate operating 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-mentioned embodiment in that it does not have the second consequent minimum calculating means 16 but has an operating time correcting means 18. 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 unit 18 adds a certain time to the operation time calculated by the center of gravity calculation unit 17, so that an appropriate operation time can be set. The size of the control circuit can be reduced with a simple configuration.

In this embodiment, the MA is included in the inference methods.
Although the X-MIN synthesis method and the center of gravity method are used, other methods are also possible, and although the suction power is expressed by the membership function in the consequent part, it can be expressed by a real value or a linear form. There is no end.

[0017]

As is apparent from the above embodiments, the control device for an air purifier according to the present invention detects a gas sensor for detecting the amount of gas and the time from the initial value of the gas sensor to the peak point at the time of change. The peak time detecting means, the gas amount change amount detecting means for detecting the amount of change from the initial value of the gas amount detected by the gas sensor to the peak value by the gas amount, and the peak time detecting means. And a control means for driving the fan motor during the operating time inferred by the fuzzy inference device, the fuzzy inference device for inferring the operating time of the fan motor from the output of The fuzzy reasoner switches the inference rule of the operating time according to the value of the resistance value ratio when the output of the gas sensor reaches the peak.By adopting this configuration, the sensitivity of the gas sensor can be improved. Even if variability can set the appropriate operating conditions, practical value is significant.

[Brief description of drawings]

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

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

FIG. 3 is a block diagram of another fuzzy reasoner.

[Explanation of symbols]

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

Claims (2)

[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 amount of gas detected by the gas sensor. The operation time of the fan motor is inferred from the gas change amount detecting means for detecting the change amount from the peak value to the peak value by the gas amount, and 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 operating time inferred by the fuzzy reasoner, wherein the fuzzy reasoner has a resistance value ratio at the time when the output of the gas sensor reaches the peak. The controller of the air purifier that switches the inference rule of the operating time depending on the value of. 2. The fuzzy inference device in place of the fuzzy inference device according to claim 1, wherein the fuzzy inference device determines the operation determined by the resistance ratio at the time when the output of the gas sensor reaches the peak. The control device for an air purifier according to claim 1, wherein a fixed time is added to the time.