JP3269094B2 - air purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier for automatically adjusting operation time and input voltage of a high-voltage power supply by detecting dust and gas in the air by a gas sensor.

[0002]

2. Description of the Related Art Conventionally, there has been an air purifier of this type. However, a gas concentration is detected based on a gas amount, etc., and a suction force is set in multiple stages. The operation was forcibly stopped after the operation was performed only for the specified time. In addition, the voltage of the high-voltage power supply for applying the high voltage in the dust collecting section always applies only a constant voltage.

[0003]

In such a conventional air purifier, when the air purifier is filled with CO gas that is not collected, only the operation for a predetermined time is performed. There was a major problem that the driver continued to drive despite feeling, and stopped operating despite the noise of the fan motor being heard on the ears and the feeling that dust still remained.

The present invention solves the above-mentioned problems, and provides an air purifier that detects the amount of gas or dust, determines the suction power and operation time suitable for each gas amount, and determines an appropriate operation. It is intended to do so.

[0005]

The air purifier of the present invention for achieving the above object has a gas sensor for detecting gas concentration in an air purifier having a fan motor for sucking dust and smoke. The rotational speed of the fan motor is varied according to the resistance value of the gas sensor in the initial state and the amount of change in the resistance value when the gas is detected. It is provided with a fuzzy inference device that determines the operation time of the fan motor according to the amount of change from the initial resistance value to the peak value, and the output of the gas sensor reaches a peak, and the output is rapidly attenuated. It is intended to stop the operation determined in Tokinifu <br/> Ajii reasoning further by the amount of change in peak arrival time and the gas amount of the output of the gas sensor, full Those having a fuzzy inference unit for determining the operation time and the input voltage of the high voltage power supply Nmota.

[0006]

In the above construction, the operation time of the fan motor is set by inputting the output of the gas sensor to the fuzzy inference device. When the output of the gas sensor changes significantly after the fuzzy inference , the fuzzy inference is performed. The operation is stopped, the operation time is determined finely, and the output of the gas sensor is input to the fuzzy inference unit to change the operation time of the fan motor and the high voltage power supply.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. For the same parts as before,
The description is omitted by using the same name and the same reference numeral. FIG.
In the figure, reference numeral 1 denotes an air purifier main body, on which a gas sensor 2 is arranged. The gas sensor 2 detects a gas amount and converts the magnitude of the gas amount into an electric signal as a change in resistance value. Reference numeral 3 denotes a peak time detecting means for detecting a time from an initial value of the gas sensor 2 to a peak point at the time of change. Reference numeral 4 denotes a gas amount change amount detecting means for detecting a change amount of the gas amount detected by the gas sensor 2 from an initial value to a peak value. Reference numeral 5 denotes a fuzzy inference unit for inferring the operation time of the fan motor 6 from the output of the peak time detection means 3 and the output of the gas amount change amount detection means 4. A control means 7 drives the fan motor 6 during the inferred operation time.

The fuzzy inference device 5 has a configuration as shown in FIG. That is, a peak time conformity calculating means 9 for obtaining the degree of conformity 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 means 11 for similarly obtaining an adaptability with respect to the input from the change amount detecting means 4 and the membership function stored in the gas amount change amount membership function storing means 10; MIN
Predicate part minimum calculation means 1 which takes
2 and MIN of the driving time membership function of the consequent part stored in the driving time membership function storage means 14 according to the rules stored in the driving time inference rule storage means 13 and And the consequent part minimum calculating means 15 for determining the conclusion of the rule, and obtaining the respective conclusions for all the rules, taking the MAX of all the conclusions, calculating the center of gravity, and finally calculating the center of gravity for obtaining the driving time. And an operation means 16. This fuzzy inference unit 5 can be easily realized by a microcomputer.

The control means 7 calculates and controls the motor operation time of the fan motor 6 based on the determined operation time.

Next, the operation of the air purifier having the above configuration will be described. The amount of gas detected by the gas sensor 2 changes greatly when the air becomes very dirty with gas or the like, for example, when two people simultaneously smoke a cigarette in the vehicle interior. It becomes smaller when there is little dirt. 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. In this way, the amount of change in the gas amount and the time until the gas reaches the peak are determined by the peak time detecting means 3.
And the gas amount change amount detecting means 4, it is possible to estimate the characteristics of the current state of the gas component in the air and what the dirt component is. In addition, the optimal motor operation time when performing air cleaning is determined by the gas amount and the like, and this is inferred by the fuzzy inference unit 7.

Next, the process of inferring the motor operation time will be described. The fuzzy inference of the present embodiment is that "if the gas amount is large and the peak arrival time is long, the operation time is long" or "if the gas is small and the peak arrival time is short, the operation time is short" Is made based on such a general judgment. The inference rules consist of nine rules shown in Table 1 below.

[0012]

[Table 1]

Qualitative concepts such as "longer" peak arrival time, "small" change in gas amount, and "very long" motor operation time are shown in FIGS. 3 (a), 3 (b) and 3 (c).
It is quantitatively expressed by a membership function as shown in FIG. The fuzzy inference unit 5 uses the input from the gas amount change amount detection unit 4 and the degree of adaptation to the membership function stored in the gas change amount membership function storage unit 10 in the gas amount change amount adaptation unit 11. M
Determined by taking AX. 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. In the antecedent part minimum calculating means 12, the MIN of the two conformances is calculated.
Is taken as the conformity of the antecedent part. In the consequent part minimum calculating means 15, the suction power member of the consequent part stored in the antecedent part conformity and the driving time membership function storage means 14 according to the rules stored in the driving time inference rule storage means 13. Take the MIN of the ship function as the conclusion of the rule.

After obtaining the conclusions for all the rules, the center-of-gravity calculating means 16 takes the MAX of all the conclusions and calculates the center of gravity to finally obtain the motor operation time. The control means 7 calculates and controls the operation time of the fan motor 6 based on the determined motor operation time. FIG. 4 shows an embodiment in which a change in gas amount after fuzzy inference is also observed to determine whether to continue or stop fuzzy inference. That is, if the CO gas or the like is rapidly reduced due to ventilation or the like immediately after the operation time is determined by fuzzy inference, the operation time in which fuzzy inference is performed is felt long, so that the change amount detection means of the gas amount is always detected. The output of the fuzzy inference stop judging unit 17 monitoring the output of the control unit 4 is connected to the control unit 7. As a result, if there is a large change in the gas amount after the fuzzy inference, the fuzzy inference is stopped and the suction force is set in multiple stages according to the gas amount as in the conventional case, so that the fan motor operation time is always appropriate. Can be determined. FIG. 5 shows an embodiment in which the voltage of the high voltage power supply 18 is adjusted by a fuzzy inference device.
That is, "if the peak arrival time is long and the amount of change in the gas amount is large, the operation time is long and the input voltage of the high-voltage power supply is increased (that is, the high-voltage output is increased)" or "the peak arrival time is short and If the change amount of the gas amount is small, the determination is made based on a general determination such as "shortening the operation time and lowering the input voltage of the high-voltage power supply (that is, lowering the high-voltage output)". According to this method, since the input voltage of the high-voltage power supply 18 suitable for the operation time is set, the dust collection efficiency is further increased.

In this embodiment, MA is included in the inference method.
Although the X-MIN synthesis method and the centroid method are used, other methods are also possible, and the suction power, which is the consequent part, is represented by a membership function. However, it can be represented by a real value or a linear form. Needless to say.

[0016]

As is clear from the above description of the embodiment, according to the air purifier of the present invention, the operation time of the fan motor is determined by fuzzy inference from the detection value of the gas sensor, so that the air cleaning is performed. In this case, gas and dust can be efficiently removed, and even if the air purifier is in any environment, for example, if the cabin is full of CO gas, it will be in the operating state the next time a cigarette is smoked. There is such an effect that an unpleasant driving sound such as a driving sound is heard in the ear even though there is no driving sound. In the second method, even after performing fuzzy inference,
Since the amount of gas is monitored, there is an effect that an optimum operation time can be obtained in any state of the ventilation of the passenger compartment. Further, the third method has an advantage that the air collection can be effectively performed because the dust collection efficiency is more optimally controlled by changing the voltage of the high-voltage power supply.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an air purifier of the present invention.

FIG. 2 is a block diagram showing a configuration of a fuzzy inference device.

FIG. 3 is a diagram showing a membership function.

FIG. 4 is a block diagram showing one embodiment of a second air purifier of the present invention.

FIG. 5 is a block diagram showing an embodiment of a third air purifier of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-vehicle air purifier main body 2 Gas sensor 3 Peak time detecting means 4 Gas amount change detecting means 5 Fuzzy inference device 6 Fan motor 7 Control means

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Norihito Mochida 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (56) References Patent 3019508 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 53/30 B01D 46/46

Claims (3)

(57) [Claims] An air purifier having a fan motor for sucking dust and smoke has a gas sensor for detecting a gas concentration, and a resistance value of the gas sensor in an initial state and a change amount of a resistance value when a gas is detected. By changing the number of rotations of the fan motor, the operation time of the fan motor is determined by the time when the change of the output of the gas sensor from the initial state reaches a peak and the amount of change from the initial resistance value to the peak value of the gas sensor. An air purifier with a fuzzy inference device to determine. 2. After the output of the gas sensor reaches a peak ,
Air purifier according to claim 1, wherein the stop operation that is determined by the full Ajii inference when the output is rapidly damped. 3. The air purifier according to claim 1, further comprising a fuzzy inference unit that determines the operation time of the fan motor and the input voltage of the high-voltage power supply based on the peak arrival time of the output of the gas sensor and the amount of change in the gas amount.