JPH0549847A - On-vehicle air cleaner - Google Patents

Abstract

PURPOSE:To make optimum cleaning operation even if the air in a vehicle is polluted by providing a gas sensor in the on-vehicle air cleaner, detecting its output by a signal detector and determining the running time of a fan motor by a fuzzy argument device, and to stop the fuzzy operation in the event of an abrupt change by monitoring the output of the gas sensor after the fuzzy argument as well. CONSTITUTION:This air cleaner is constituted of the fan motor 6 for sucking dust, the gas sensor 2 for detecting gas and a control means for determining the running time of the fan motor 6 by the output of this gas sensor 2. Even if, therefore, gaseous CO components remain, the optimum running time is obtd. The adequate running time is obtd. in spite of the presence of a change in a ventilation state after the fuzzy argument 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle air purifier which detects dust and gas in the air by a gas sensor and automatically adjusts an operating time and an input voltage of a high voltage power source.

[0002]

2. Description of the Related Art Conventionally, there has been a vehicle air purifier of this type, but the gas concentration is detected by the amount of gas and the suction force is set in multiple stages. , I had to forcibly stop the operation after running it for a set time. Further, the voltage of the high-voltage power supply for applying a high voltage to the dust collecting section is always a constant voltage.

[0003]

In such a conventional on-vehicle air purifier, when the CO gas not collected by the air purifier is full, the air purifier is operated only for a predetermined time. Although it felt clean, it continued to operate, and there was a big problem that the fan motor noise was heard, and the operation was stopped despite feeling that dust still remained.

The present invention solves the above problems, and detects the amount of gas or dust and finely determines the suction force and the operating time suitable for each gas amount, and determines the appropriate operation. It is intended to provide.

[0005]

An on-vehicle air purifier of the present invention for achieving the above object is a fan motor for sucking dust, a gas sensor for detecting a gas amount, and a fuzzy based on a detection value of the gas sensor. It comprises a fuzzy reasoner that determines the operating time of the fan motor by inference, and has a judger that stops the fuzzy reasoning when the detected value of the gas sensor changes significantly after the fuzzy reasoning. It comprises a fuzzy reasoner which determines the operating time of the fan motor and the input voltage of the high-voltage power supply by fuzzy reasoning from the detected value of.

[0006]

In the above structure, the output of the gas sensor is input to the fuzzy inference unit to set the operation time of the fan motor, and when the output of the gas sensor changes significantly after the fuzzy inference, the fuzzy inference is performed. The operation is stopped, the operating time is finely determined, and the output of the gas sensor is input to the fuzzy reasoner to change the operating time of the fan motor and the high voltage power supply.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a vehicle air cleaner main body, and a gas sensor 2 is arranged therein. Gas sensor 2
Is for detecting the gas amount and converting the magnitude of the gas amount into an electric signal as a change in resistance value. A 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. Reference numeral 4 is a gas amount change detecting means for detecting the amount of change in the gas amount detected by the gas sensor 2 from the initial value to the peak value. Reference numeral 5 is a fuzzy reasoner which infers the operating time of the fan motor 6 from the output of the peak time detecting means 3 and the output of the gas amount change detecting means 4. Reference numeral 7 is a control means, which drives the fan motor 6 during the inferred operating time.

The fuzzy reasoner 5 has a structure as shown in FIG. That is, the peak time fitness calculation for obtaining the fitness of 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. Means 9 and change amount adaptability calculating means 11 for similarly obtaining the adaptability with respect 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. MIN of the two goodnesses of fit
Is the suitability of the antecedent part. Antecedent part minimum calculation means 1
2 and the MIN of the driving time membership function of the consequent part stored in the driving time membership function storage means 14 according to the rule stored in the driving time inference rule storage means 13. The minimum part of the consequent part which is used as the conclusion of the rule, and the MAX of all conclusions after obtaining the respective conclusions of all the rules and calculating the center of gravity thereof to finally obtain the driving time. The calculation means 16 is included. This fuzzy reasoner 5 can be easily realized by a microcomputer.

The control means 7 calculates the motor operating time of the fan motor 6 on the basis of the determined operating time and controls it.

Next, the operation of the vehicle-mounted air purifier having the above structure will be described. The amount of gas detected by the gas sensor 2 is greatly changed when the air is extremely polluted by gas or the like by, for example, smoking two people at the same time in the passenger compartment, and one person puts a cigarette on the table. It becomes smaller when there is little dirt, such as when it is worn. Moreover, the time until the amount of gas reaches the peak varies 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 the contamination. One can deduce what the ingredients are. The optimum motor operating time for air cleaning is determined by the amount of gas and the like, which is inferred by the fuzzy inference unit 7.

Next, the process of inferring the motor operating time will be described. The fuzzy inference according to the present embodiment is "if the amount of gas is large and the peak arrival time is long, the operating time is extended". Also, "if the gas is small and the peak arrival time is short, the operating time is long". It is made based on a general judgment such as "shorten". The inference rules consist of nine rules shown in Table 1 below.

[0012]

[Table 1]

The qualitative concept that the peak arrival time is "long", the amount of change in the gas amount is "small", and the motor operating time is "very long" is shown in FIGS. 3 (a) and 3 (b).
It is quantitatively expressed by a membership function as shown in (c). The fuzzy reasoner 5 uses the gas amount change amount adaptability calculation means 11 to determine the degree of conformity between the input from the gas amount change amount detection means 4 and the membership function stored in the gas change amount membership function storage means 10. M
Calculate by taking AX. 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 calculation means 12, the MIN of the two conformances is calculated.
Is taken as the suitability of the antecedent part. In the consequent part minimum calculation means 15, according to the rule stored in the driving time inference rule storage means 13, the consequent part suction power member stored in the antecedent part conformance and driving time membership function storage means 14 The MIN of the ship function is taken to conclude the rule.

After obtaining the respective conclusions for all the rules, the centroid calculating means 16 takes the MAX of all the conclusions and calculates the centroid to finally obtain the motor operating time. The control means 7 calculates and controls the operating time of the fan motor 6 based on the determined motor operating time. Further, FIG. 4 shows an embodiment in which the change in the gas amount after the fuzzy inference is also observed to judge whether the fuzzy inference is continued or stopped. That is, if the CO gas or the like decreases rapidly due to ventilation immediately after the operating time is determined by the fuzzy inference, the fuzzy inferred operating time is felt to be long, and therefore the variation detecting means for the gas amount is always present. The output of the fuzzy inference stop judgment device 17, which monitors the output of No. 4, is connected to the control means 7. As a result, when there is a large change in the gas amount after the fuzzy inference, the fuzzy inference is stopped, so that an appropriate operating time of the fan motor can always be determined. Further, FIG. 5 shows an embodiment in which the voltage of the high voltage power source 18 is adjusted by a fuzzy reasoner. 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 increased." Is short and the amount of change in the gas amount is small, the operating time is shortened and the input voltage of the high-voltage power supply is lowered (that is, the high-voltage output is lowered). According to this method, since the input voltage of the high voltage power supply 18 is suitable for the operating time, the dust collection efficiency is further increased.

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, which is the consequent part, is expressed by the membership function, it can also be expressed by a real value or linear form. Needless to say.

[0016]

As is apparent from the above description of the embodiments, according to the on-vehicle air purifier of the present invention, the operating time of the fan motor is determined by fuzzy inference based on the detection value of the gas sensor. Gas and dust can be efficiently removed when cleaning the vehicle, and no matter what environment the air purifier has, for example, CO gas in the passenger compartment, the next time you smoke, it will be in an operating state and It has the effect of eliminating the annoying driving sound, such as the driving sound coming into the ears without smoke. The second method also monitors the gas amount even after the fuzzy inference is performed, so that it has an effect that an optimum operating time can be obtained in any state of vehicle ventilation. In the third method, since the dust collection efficiency is controlled more optimally by changing the voltage of the high voltage power source,
It has the advantage of effective air cleaning.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an in-vehicle air cleaner of the present invention.

FIG. 2 is a block diagram showing the configuration of a fuzzy reasoner.

FIG. 3 is a diagram showing a membership function.

FIG. 4 is a block diagram showing an embodiment of a second vehicle air cleaner of the present invention.

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

[Explanation of symbols]

 1 Car Air Purifier Main Body 2 Gas Sensor 3 Peak Time Detecting Means 4 Gas Quantity Change Detecting Means 5 Fuzzy Reasoning Machine 6 Fan Motor 7 Control Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihito Mochida 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Seiichi Ueno 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. An in-vehicle air purifier having a fan motor for inhaling dust and smoke, wherein a gas sensor for detecting a gas component, exhaust gas, etc. of a cigarette is provided in the in-vehicle air purifier main body, and a gas sensor for detecting the initial state of the gas sensor is provided. Depending on the ratio between the resistance value and the resistance value when gas is detected, the rotation speed of the fan motor is changed, and the time when the change of the output of this gas sensor from the initial state reaches the peak and the gas sensor An in-vehicle air purifier equipped with a fuzzy reasoner that determines the operating time of the fan motor based on the rate of change from the initial resistance value. 2. When the output of the gas sensor reaches a peak, it is attenuated, and when the output falls below a set level for determining the rotational speed of the fan motor, the operation determined by fuzzy inference is stopped. The in-vehicle air purifier according to claim 1, wherein the operation is switched according to the output of the gas sensor. 3. The on-vehicle air purifier according to claim 1, further comprising a fuzzy inference unit that determines the operating time of the fan motor and the input voltage of the high-voltage power supply based on the output of the gas sensor.