KR20010070675A - Method for measuring a pollution level of air-cleaner - Google Patents

Abstract

PURPOSE: A measuring method of pollution level of air purifier is provided, which can detect pollution level correctly and can increase precision of air purifier by overcoming deviation of output voltage caused by changing of pollution environment and error of resistance of pollution detecting sensor itself, the overcoming being made by comparing the absolute value set preliminary at the sensor with present actual pollution level. CONSTITUTION: The method is as follows: (i) divide pollution environment into a clean condition (Co) at which fan is on a low speed, a primary pollution condition (C1) at which fan is on a medium speed and a secondary pollution condition (C2) at which fan is on high speed; (ii) measure voltage according to pollution conditions for measuring output voltages at various pollution conditions of clean, primary and secondary; (iii) store absolute values according to pollution threshold for storing the measured voltage at the micro computer as a data of absolute value; (iv) compare relatively the output voltage (Vo) of pollution detecting sensor (1) that is proportional to the present real pollution level of the room with the absolute values (CV0-CV2) obtained at pollution conditions (C0-C2); and (v) decide pollution level of room according to the resulting value obtained at the relative comparing step (iv).

Description

Method for measuring a pollution level of air-cleaner

The present invention relates to a method for measuring the pollution level of an air purifier, and more particularly, to classify a pollution detection sensor before being installed in an air purifier into a plurality of conditions according to the degree of pollution, and to output the voltage from the pollution detection sensor under each pollution condition. Is stored as absolute value data, and the environment is changed by judging the degree of pollution by comparing the voltage value output in proportion to the actual indoor pollution and the absolute value of the voltage stored for each pollution condition. The present invention relates to a method for measuring the pollution level of an air cleaner to overcome the output voltage deviation caused by the error, thereby increasing the precision of the air cleaner.

FIG. 1A is a pollution detection circuit diagram of a general air cleaner, and includes a pollution detecting sensor 1 including a heating coil 3 to which 5V is applied, and a gas electrode 2 on which tin oxide (SnO 2) is surface-treated. At the output end of the pollution detection sensor 1, a pollution detection signal is applied to the microcomputer 6 via resistors R1 and R2 connected in series to adjust the sensitivity.

When the + 5V constant voltage is applied to the pollution detection sensor 1, the pollution degree detecting circuit of the air purifier generates heat by heating the heating coil 3, and the heated heat is transmitted to the gas electrode 2. A constant voltage is applied to the gas electrode 2 and the resistors R1 and R2, respectively, and an output voltage appearing between the resistor R2 and the ground is applied to the microcomputer 6 to detect the air pollution.

That is, when oxygen is adsorbed on the tin oxide (SnO 2) surface-treated on the gas electrode 2, the oxygen is free from the tin oxide (SnO 2) due to the electron affinity. It interferes with the flow of electrons and increases electrical resistance.

When a gas such as hydrogen is introduced into the sensor, an oxidation reaction between the gas and the adsorbed oxygen occurs on the surface of tin oxide (SnO 2), and as a result, it is adsorbed on the surface of tin oxide (SnO 2). By reducing the oxygen present, electrons move easily, and the electrical resistance decreases, so that the concentration of the gas contained in the atmosphere can be detected by the resistance change.

Therefore, when a pollutant is generated, the voltage across the gas electrode 2 is significantly reduced, and the voltage between both ends of the resistors R1 and R2 is relatively increased, so that the output voltage of the pollution detection sensor 1 is reduced to a microcomputer ( In 6), the fan obtained by converting the digital signal and the preset data are compared with each other to control the blowing fan according to various conditions.

Referring to the conventional method of controlling the air purifier using the pollution detection sensor 1 in detail with reference to Figure 1b, first, the pollution state of the room is divided into three or more conditions, according to the clean state divided by each condition The voltage output from the pollution detection sensor 1 is input to the microcomputer 6 and stored in advance.

For example, assume that the output voltage of the pollution detection sensor 1 is 0.7V when the room is clean, and the output voltage is 1V when the room is contaminated to some extent and needs to operate the air cleaner. Save it to (6).

In this state, when the air cleaner is powered and operated in the automatic operation mode, after warming up for about 3 minutes, the output voltage Vo of the pollution detection sensor 1 is read from the microcomputer 6, When the output voltage Vo of the pollution detection sensor 1 is 0.7 V or less, it is determined as a clean state and the blowing fan is controlled at a low speed.

In addition, when the output voltage Vo of the pollution detection sensor 1 read from the microcomputer 6 is between 0.7V and 1V, it is determined that cleanness is required and the blower fan is controlled at a medium speed. If the output voltage Vo of (1) is 1V or more, it is determined that it is contaminated to control the blowing fan at high speed.

In the conventional method of measuring the pollution level of the air cleaner, the environment according to the pollution level of the room is first set in a number of conditions, and the blower fan is controlled by absolute evaluation according to the voltage value output from the pollution detection sensor 1, If the environment is outside the pollution range set by a number of conditions, it is difficult to determine the pollution level.

In particular, the mass-produced pollution detection sensor 1 has a different internal self resistance (Rs) in the same environment for each individual product, which causes a deviation from the reference voltage according to each pollution degree stored in the microcomputer 6, resulting in contamination. The output voltage of the sensing sensor 1 is lower or higher than the actual voltage to be output, which is a problem in that optimal control is not achieved.

For example, assuming that the reference voltage stored in the microcomputer 6 is 0.7V when the room is in a clean state, when the actual indoor environment is contaminated and it is necessary to control the blower fan at high speed, a pollution detection sensor ( The output voltage of 1) should be more than 1V, but the output voltage is less than 1V due to the variation of internal self-resistance (Rs).

In order to solve the above problems, the present invention divides the pollution detection sensor into a plurality of conditions according to the pollution degree before the air cleaner is installed, and the voltage outputted from the pollution detection sensor under each pollution condition as absolute data. After storing, the output is generated by changing the environment by comparing the voltage value output in proportion to the actual indoor pollution and the absolute value of the voltage stored for each pollution condition to determine the pollution level, or by the error of the pollution sensor's own resistance. It is a technical problem that the accuracy of the air cleaner can be improved by overcoming the voltage deviation.

The present invention relates to a method of measuring a pollution level of an air cleaner in which an output voltage of a pollution detection sensor consisting of a heating coil and a gas electrode is read by a microcomputer to determine a pollution level in a room. Pollution detection step for classifying each pollution condition into a primary pollution condition that controls the blower fan of the air cleaner at medium speed, and a secondary pollution condition that controls the blower fan of the air cleaner at high speed; A voltage measurement step for each pollution condition for measuring the output voltage of the battery; an absolute value storage step for each pollution standard for storing the voltage measured under each condition as an absolute value data; and pollution that is proportional to the actual pollution degree of the current room. Relative comparison step of comparing the output voltage of the detection sensor and the absolute value of the output voltage obtained in the contamination condition, phase It is characterized in consisting of a pollution level determination step for determining a pollution level in the room by the comparison result in comparing the relative phase.

Figure 1a is a pollution degree detection circuit diagram of a typical air cleaner.

1B is a blowdown fan control according to a pollution detection circuit diagram and a pollution level of a conventional air cleaner

Flowchart.

Figure 2 is an exemplary measurement of the sensitivity of the pollution detection sensor according to the present invention.

Figure 3 is an embodiment of the contamination detection sensor under different pollution conditions as an embodiment of the present invention

The process of measuring the output voltage and storing it in the microcomputer.

4 is a blowing fan control according to the method for measuring the pollution level of the air cleaner according to the present invention

Flowchart.

<Explanation of symbols for main parts of drawing>

1: Pollution detection sensor 2: Gas electrode

3: heating coil 6: microcomputer

10a-10c: 1st-3rd chamber

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to FIGS. 2 and 4.

2 is an exemplary view illustrating the sensitivity measurement of the pollution detection sensor 1 according to the present invention, each having first to third chambers 10a to 10c having a constant volume, and including the first to third chambers ( 10a ~ 10c) The inside should have different pollution degree using the same pollution source.

In the present invention, for convenience of description, the volumes of the first to third chambers 10a to 10c are set to 1.0 m 3, the internal temperature is uniformly maintained at 16 ° C., and the humidity RH 40%. It was.

In addition, the first chamber 10a is maintained in a clean state without a source of contamination, and inside the second chamber 10b, seven cigarette smokes, which are pollutants, are put in, and the third chamber 10c, tobacco smoke, which is a source of contamination, is introduced. Twelve donations were made to vary the degree of contamination.

Ten contamination detection sensors (1) randomly extracted under the condition given above are sequentially inputted to the first to third chambers (10a to 10c) for about 1 minute, and then the output voltage of the pollution detection sensor (1) Vo and the self resistance value Rs are measured as the first to third voltage / resistance measuring instruments 11a to 11c.

That is, the voltage value and the self-resistance value output from the pollution detection sensor 1 in the first chamber 10a in a clean state without a pollution source are called V (0) and RS (0), and seven cigarette smokes are introduced. In the second chamber 10b, the voltage value and the self-resistance value output from the pollution detection sensor 1 are called V (7) and RS (7), and the third chamber into which twelve sips of tobacco smoke flows ( The voltage value and the self resistance value output from the contamination detection sensor 1 in 10c) are referred to as V (12) and RS (12).

As described above, the output voltage values V and the self resistance values RS of the ten pollution detection sensors 1a to 1j via the first to third chambers 10a to 10c having different pollution degrees are shown in Table 1.

Table 1

Pollution Detection Sensor Output voltage (V) Self-resistance (RS) Remarks V (0) V (7) V (12) RS (0) RS (7) RS (12) 1a 0.596 1.100 2.371 74.495 19.591 4.763 1b 0.534 1.150 2.319 106.583 18.079 4.987 1c 0.652 1.200 2.516 58.230 16.752 4.194 1d 0.712 1.000 2.386 46.951 23.350 4.700 1e 0.482 1.100 2.236 164.518 19.591 5.372 1f 0.537 0.920 1.800 104.435 27.366 8.133 1 g 0.525 1.150 2.303 113.571 18.079 5.059 1h 0.690 0.900 1.760 50.574 28.564 8.474 1i 0.626 1.220 2.551 64.849 16.265 4.068 1j 0.501 0.760 1.160 137.424 40.513 17.800

As shown in Table 1, the 10 pollution detection sensors 1 are sequentially introduced into the first to third chambers 10a to 10c having different pollution levels, thereby output voltage value V and self-resistance value RS. ) Is different from each other, and the reference voltage according to the pollution level is set by inputting the output voltage (V) of the pollution detection sensor (1) shown in the measurement result to the microcomputer (6) as an absolute value. .

For example, if the air cleaner is manufactured using the sixth pollution sensor 1e, 0.482V is used as a reference voltage to control the air flow rate at a low speed when the room is clean. 1.1V is used as the reference voltage for controlling the medium speed, and 2.236V is stored in the microcomputer 6 as the reference voltage for controlling the air flow at high speed due to contamination of the room.

Therefore, in the pollution degree measuring method of the air cleaner of the present invention, each pollution detection sensor (1) used in the air cleaner as described above flows into the chamber with different pollution levels, and then accurately measures the output voltage according to the pollution concentration, By storing the measured voltage as a reference absolute value for each control condition in the microcomputer 6, and comparing the range of the reference absolute value with the output voltage value of the current pollution detection sensor 1 and controlling the blowing fan accordingly. It is to improve the precision of the air cleaner.

The chamber and pollutant source used to measure the output voltage of the pollutant detection sensor 1 may vary depending on the application field of the air cleaner such as automobiles, businesses, households, and industries, and the volume and the pollutant source may be changed according to the use environment. do.

Through this method, the reference absolute values of the various conditions according to the pollution degree are stored in the microcomputer 6, and the blower fan is appropriately controlled by comparing the actual output voltage of the pollution detection sensor 1 with the stored reference absolute values. .

3 is a process chart of measuring the output voltage of the contamination detection sensor under different pollution conditions and storing it in a microcomputer. As described above, the output voltage of the pollution detection sensor 1 is measured for each pollution condition using a chamber and a pollution source. Then, the voltage value measured for each condition is stored in the microcomputer 6 as an absolute value.

In other words, the air conditioner is classified into three types of pollution, but the air conditioner's blower fan is controlled at low speed because the room is not contaminated. The case of controlling at medium speed is defined as the primary pollution condition (C1), and the case of controlling the air volume of the air cleaner at high speed due to the high degree of pollution in the room is defined as the secondary pollution condition (C2).

As described above, after measuring the output voltage of the pollution detection sensor 1 when the room is under the clean condition C0, the measured voltage (hereinafter referred to as "CV absolute value") is stored in the microcomputer 6. After measuring the output voltage of the pollution detection sensor 1 when the room is in a primary pollution condition (C1), the measured voltage (hereinafter referred to as "first pollution absolute value (CV1)") is measured by a microcomputer ( 6) and after measuring the output voltage of the pollution detection sensor 1 when the room is in the secondary pollution condition (C2), the measured voltage (hereinafter referred to as the "secondary pollution absolute value (CV2)") Are stored in the microcomputer 6 respectively.

4 is a flow chart of the fan control according to the pollution degree measuring method of the air purifier according to the present invention, as described above, the absolute absolute value (CV0), the absolute value of primary pollution (CV1), the absolute value of secondary pollution (CV2) When the air cleaner is supplied with power and stored in the microcomputer 6 and operated in the automatic operation mode, after warming up for about 3 minutes, the output voltage Vo of the pollution detection sensor 1 is changed to the microcomputer 6. At this time, the output voltage (Vo) value of the pollution detection sensor (1) read and the absolute value (CV0 to CV2) stored for each pollution condition in the microcomputer (6) are compared with each other. Determination of contamination

That is, when contaminants occur in the room, the voltage across the pollution detection sensor (1) and the gas electrode (2) is significantly reduced, and the voltage between both ends of the resistors (R1) and (R2) is relatively increased. (Vo) will change.

When the output voltage Vo of the pollution detection sensor 1 is in a range less than the absolute clean value CV0 stored in the microcomputer 6, the indoor environment is recognized as a clean state without contamination, and the blower fan is operated at a low speed. And if the output voltage Vo of the pollution detection sensor 1 is present between the absolute absolute value CV1 and the absolute absolute value CV2 stored in the microcomputer 6, the primary pollution. If the blower fan is controlled at a low speed and the output voltage Vo of the pollution detection sensor 1 is in a range larger than the absolute value of the secondary pollution CV2 stored in the microcomputer 6, the room is controlled. Recognizing that the environment is very polluted, the fan will be controlled at high speed.

In this way, the pollution detection sensor 1 before being installed in the air cleaner is measured in advance in the output voltage value according to each pollution degree and stored in the microcomputer 6 as absolute data, and then the pollution detection sensor 1 is stored. After installation in the air cleaner, by comparing the absolute value of the stored voltage with the range of the output voltage in proportion to the actual indoor pollution, it is possible to overcome the output voltage deviation caused by the change of environment or the error of the pollution sensor's own resistance. There is to increase the precision.

As described above, the method for measuring the pollution level of the air cleaner according to the present invention uses the output voltage of the pollution value measured under different pollution conditions when cleaning the pollution detection sensor before being installed in the air cleaner as an absolute value data to the microcomputer. After the pollution sensor is installed in the air cleaner, the environment is changed by comparing the absolute value of the stored voltage with the range of the output voltage in proportion to the actual indoor pollution. It is possible to overcome the output voltage deviation generated, so that the degree of contamination can be accurately detected, thereby increasing the precision of the air cleaner.

Claims (1)

In the contamination level measuring method of the air cleaner which determines the pollution level in the room after reading the output voltage of the pollution detection sensor (1) consisting of the heating coil (3) and the gas electrode (2), Clean condition (C0) to control the blower fan of the air cleaner at low speed, primary pollution condition (C1) to control the blower fan of the air cleaner at medium speed, and secondary pollution condition to control the blower fan of the air cleaner at high speed (C2) each of the pollution environment classification step, A voltage measurement step for each pollution condition for measuring the output voltage CV0 to CV2 of the pollution detection sensor 1 under each pollution condition C0 to C2; An absolute value storage step for each pollution criterion for storing the voltage measured under each condition in the microcomputer 6 as absolute data; A relative comparison step of comparing the output voltage Vo of the pollution detection sensor 1 proportional to the actual pollution degree of the current room and the absolute value CV0 to CV2 of the output voltage obtained under the pollution conditions C0 to C2; Pollution degree measuring method of the air purifier, characterized in that consisting of a pollution degree determining step of determining the pollution degree of the room by the result value compared in the relative comparison step.