JPH04260458A - On-vehicle air purifier - Google Patents

Abstract

PURPOSE:To operate an air purifier so as to emit proper operation sound by finely controlling suction force suitable for the amount of gas from the detection value of a gas sensor and the output of a light detection means using fuzzy inference and discriminating day and night. CONSTITUTION:A fan motor 6 sucking dust or smoke, a gas sensor 1 detecting the smoke of a tobacco or exhaust gas, a light detection means 2 detecting the quantity of light of the circumference and a fuzzy inference device 5 determining the suction force of the fan motor 6 are mounted and the fuzzy inference device determines the suction force of the fan motor 6 from the outputs of the gas sensor 1 and the light detection means 2 so as to finely determine suction force and discriminates day and night to perform operation so as to emit proper sound.

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 cleaner that detects dust and gas in the air using a Fas sensor and automatically controls the suction force and input voltage of a high-voltage power supply.

0002

2. Description of the Related Art In recent years, there has been a demand for in-vehicle air cleaners that detect dust and gas in the air inside a vehicle and control the suction force.

[0003] Conventionally, this type of in-vehicle air purifier has been designed to detect gas concentration based on the amount of gas, etc., and to determine the suction force in multiple stages. Further, the voltage of the high voltage power supply for applying high voltage to the dust collecting section is only a constant voltage. Furthermore, the air was always purified with a fixed suction power, regardless of day or night.

0004

[Problems to be Solved by the Invention] Such conventional vehicle-mounted air cleaners have had the following problems. In other words, the amount of gas cannot be set in two to three stages, but changes continuously, and the suction force that can be set accordingly must also be set in multiple stages, and the optimal suction can be determined depending on the amount of gas and dust. There was a problem that the power could not be set. On the other hand, in the environment in which the air purifier is used, for example, during the daytime, there is a lot of ambient noise, so even if the fan motor is a little loud, it can be annoying, but at night, the ambient noise is low, so the operating noise can be audible. Therefore, it is necessary to be able to collect dust appropriately without producing unpleasant operating noises. However, since conventional car air purifiers purify the air with a constant suction force regardless of day or night, when the surroundings are quiet, such as at night, the noise of the fan motor can be audible. It had a big problem.

[0005] The present invention solves these conventional problems, and uses fuzzy inference to detect the amount of gas and dust collected from the detected value of the gas sensor and the output of the optical detection means, and to determine the amount of gas. The purpose is to determine the appropriate suction force in detail, distinguish between day and night, and determine the appropriate operating sound.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fan motor that sucks in dust, smoke, etc.
The fuzzy inference device includes a gas sensor that detects cigarette smoke, exhaust gas, etc., a light detection means that detects the amount of surrounding light, and a fuzzy inference device that determines the suction force of the fan motor, and the fuzzy inference device detects the gas sensor and the light detection device. A first means for solving the problem is that the suction force of the fan motor is determined by the output of the means.

Further, the fuzzy inference device of the first problem solving means determines the suction force of the fan motor and the input voltage of the high-voltage power supply for applying high voltage to the dust collecting section based on the outputs of the gas sensor and the light detection means. This is the second problem-solving method.

[0008]

[Operation] The present invention has the above-mentioned first problem solving means.
The suction force can be precisely determined, dust can be collected efficiently regardless of the amount of gas or dust, and the appropriate operating sound can be determined by determining day or night, making it possible to obtain an on-vehicle air purifier that is extremely easy to operate.

Furthermore, according to the second problem-solving means, the suction force can be determined in detail, and the dust collection efficiency can be more optimally controlled by changing the voltage of the high-voltage power supply.

0010

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, a gas sensor 1 detects the amount of gas in the air inside the vehicle, and converts the amount of gas into an electrical signal. The light detection means 2 detects the brightness of the surroundings and converts the brightness into an electrical signal. The absolute gas amount detection means 3 detects the absolute amount of gas detected by the gas sensor 1. The absolute amount of light detection means 4 calculates the absolute amount of light detected by the light detection means 2. The fuzzy inference device 5 infers the rotational speed of the fan motor 6 from the output of the absolute gas amount detection means 3 and the output of the absolute light amount detection means 4. The control means 7 calculates the inferred rotation speed motor drive voltage amount and drives the fan motor 6.

As shown in FIG. 2, the fuzzy reasoner 5 calculates the degree of compatibility between the input from the absolute gas amount detection means 3 and the membership function stored in the absolute gas amount membership function storage means 8. Similarly, the goodness of fit is calculated with respect to the input from the absolute light amount detection means 4 and the membership function stored in the absolute light amount membership function storage means 1. a calculation means 11 for calculating the degree of suitability of the light amount to be obtained;
Antecedent part minimum calculation means 12 which takes the MIN of the two fitness degrees and determines the fitness of the antecedent part, and rotation speed inference rule storage means 1.
3, the consequent is determined by taking the MIN of the antecedent suitability and the rotation number membership function of the consequent part stored in the rotation number membership function storage means 14 as the conclusion of the rule. The system is comprised of a minimum calculation means 15, and a center of gravity calculation means 16 which obtains each conclusion for all the rules, takes the MAX of all the conclusions, calculates the center of gravity, and finally obtains the number of revolutions. This fuzzy inference device 5 can be easily realized by a microcomputer. Note that the control means 7 calculates and controls the motor drive voltage amount of the fan motor 6 based on the determined rotation speed.

Next, to explain the operation of the in-vehicle air purifier having the above configuration, the absolute amount of gas detected by the gas sensor 1 becomes large when the air is extremely contaminated with gas, etc. When there is less, it becomes smaller. Also,
The absolute amount of light detected by the light detection means 2 increases when the surroundings are bright, and decreases when the surroundings are dark. Therefore, dirt in the air can be determined from the output of the gas sensor 1,
The surrounding brightness can be determined from the output of the light detection means 2. When the absolute amount of gas and the absolute amount of light are detected by the absolute amount of gas amount detection means 3 and the absolute amount of light amount detection means 4, it is possible to determine the characteristics of the current air pollution state and the brightness (day or night). ) can be estimated. Further, the optimal rotation speed of the fan motor 6 when performing air purification is determined by the amount of gas, etc., and this is inferred by the fuzzy reasoning device 5.

Next, the process of inferring the rotational speed of the fan motor 6 will be explained. The fuzzy reasoning in this example is ``If the amount of gas is large and the surrounding area is bright (daytime), increase the suction force'' and ``If the amount of gas is small and the surrounding area is dark (it is night), increase the suction force.'' This is done based on general judgments such as "to reduce the suction force." The inference rules consist of nine rules shown in (Table 1).

[0015]

[Table 1]

Here, when the amount of gas is "large" or the amount of light is "
The suction force (rotation speed) of the fan motor 6
The qualitative concept of “slightly large” is shown in Figures 3a, b,
It is expressed quantitatively by a membership function as shown in c. The fuzzy inference device 5 includes gas amount compatibility calculation means 9
Now, the degree of compatibility between the input from the absolute gas amount detection means 3 and the membership function stored in the absolute gas amount membership function storage means 8 is determined by taking the MAX of both. The light amount compatibility calculation means 11 similarly calculates the compatibility with respect to the input from the absolute light amount detection means 4 and the membership function stored in the absolute light amount membership function storage means 10. The antecedent minimum calculation means 12 takes the MIN of the two degrees of suitability and sets it as the degree of suitability of the antecedent. In the consequent minimum calculation means 15,
According to the rules stored in the rotation speed inference rule storage means 13, the MIN of the rotation speed membership function of the antecedent part and the rotation speed membership function of the consequent stored in the rotation speed membership function storage means 14 is calculated. This is the conclusion.

After finding the respective conclusions for all the rules, the center of gravity calculation means 16 takes the MAX of all the conclusions and calculates the center of gravity to finally calculate the suction force (rotation speed) of the fan motor 6. Seek. Control means 7
Then, based on the determined rotation speed of the fan motor 6, the phase control amount of the fan motor 6 is calculated and controlled.

Next, FIG. 4 shows another embodiment of the present invention.
Explain using. Components having the same configuration as those in the above embodiment are given the same reference numerals and explanations will be omitted.

As shown in the figure, the fuzzy inference unit 17 controls the fan motor 6 based on the outputs of the gas sensor 1 and the light detection means 2.
The suction force of the dust collector and the input voltage of the high voltage power supply 18 for applying high voltage to the dust collecting section are determined. The control means 19 calculates the amount of motor drive voltage from the inferred rotation speed, drives the fan motor 6, and further inputs the inferred input voltage to the high voltage 18. Fuzzy reasoning is ``If there is a large amount of gas and a large amount of light, the suction force will be large and the input voltage of the high voltage power supply will be increased (that is, the high voltage output will be increased)''
In addition, the determination is made based on general judgments such as, ``If the amount of gas and the amount of light is small, reduce the suction force and lower the input voltage of the high-voltage power supply (that is, lower the high-voltage output).''

[0020] In the above 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 although the suction force, which is the consequent, is expressed by a membership function, it is also possible to express it with real values or linear form. Needless to say.

[0021]

Effects of the Invention As is clear from the above embodiments, the present invention includes a fan motor that sucks in dust, smoke, etc., a gas sensor that detects cigarette smoke, exhaust gas, etc., and a light sensor that detects the amount of surrounding light. and a fuzzy inference device for determining the suction force of the fan motor, and the fuzzy inference device determines the suction force of the fan motor based on the outputs of the gas sensor and the light detection means. The rotation speed of the fan motor can be precisely determined according to the surrounding brightness using fuzzy inference based on the amount of light and the amount of light, and the effect is that gas and dust can be removed quietly and efficiently regardless of day or night.

Furthermore, since the fuzzy reasoner determines the suction force of the fan motor and the input voltage of the high-voltage power supply for applying high voltage to the dust collecting section based on the outputs of the gas sensor and the light detection means, the rotation speed of the fan motor and By changing the voltage of the high-voltage power supply, the dust collection efficiency can be more optimally controlled, and there is an advantage that effective air purification can be achieved.

[Brief explanation of the drawing]

[Fig. 1] Block diagram of an in-vehicle air cleaner according to an embodiment of the present invention

[Figure 2] Block diagram of the fuzzy inference unit of the in-vehicle air purifier

[Figure 3] (a) to (c) Diagrams showing membership functions of the same fuzzy inference machine

[Fig. 4] Block diagram of a vehicle air cleaner according to another embodiment of the present invention.

[Explanation of symbols]

1 Gas sensor 2. Light detection means 5 Fuzzy reasoner 6 Fan motor

Claims (2)

[Claims] [Claim 1] A fan motor that sucks in dust, smoke, etc.; a gas sensor that detects cigarette smoke, exhaust gas, etc.;
The apparatus includes a light detection means for detecting the amount of surrounding light, and a fuzzy inference device for determining the suction force of the fan motor, and the fuzzy inference device determines the suction force of the fan motor based on the outputs of the gas sensor and the light detection means. This is how an in-vehicle air purifier is made. 2. The in-vehicle device according to claim 1, wherein the fuzzy reasoning device determines the suction force of the fan motor and the input voltage of a high-voltage power supply for applying high voltage to the dust collecting section based on the outputs of the gas sensor and the light detection means. air purifier.