JP5360682B2 - Exhaust gas measuring device - Google Patents

Description

The present invention relates to an exhaust gas measuring device for measuring the concentration of particulate matter such as black smoke contained in exhaust gas discharged from an engine, and in particular, detects transmitted light of light irradiated to the exhaust gas to be measured. The present invention relates to an exhaust gas measuring device that measures exhaust gas concentration.

While vehicle exhaust gas regulations are becoming stricter, it is necessary to take measures against the occurrence of smoke at the time of start-up, particularly at low temperature start, and smoke at high altitudes.
Conventionally, as a smoke detector, a method of measuring the concentration of smoke based on the reflectance and transmittance of light irradiated in exhaust gas is known. For example, as a light transmission type smoke measuring apparatus, as shown in FIG. 7, the exhaust gas 04 flows in the direction of the arrow in the exhaust gas passage 03, and a light source is formed so as to cross the exhaust gas passage 03. The light emitting unit 05 having 09 and the light receiving unit 013 having the light detection sensor 015 are provided to face each other.

The light emitting unit 05 includes, for example, an LED (issuing diode) or a laser irradiation device as the light source 09, and a light emitting unit lens 011 for allowing the light emitted from the light source 09 to enter the exhaust gas passage 03 as parallel light in the exhaust gas passage 03 It is exposed and provided.
In addition, the light receiving unit 013 includes a light detection sensor 015 made of, for example, a photodiode, and a light receiving unit lens 019 that collects the parallel light transmitted through the exhaust gas passage 03 and causes the light to enter the light detection sensor 015. The light receiving unit lens 019 is provided to be exposed in the exhaust gas passage 03.

  The light emitted from the light source 09 is received in accordance with the concentration of the particulate matter in the exhaust gas because the progress of the irradiation light is hindered by the shielding action of the fine particles present in the exhaust gas in the process of passing through the exhaust gas passage 03. By utilizing the fact that the amount of light incident on the light detection sensor 015 of the unit 013 decreases, the concentration of the particulate matter is determined by measuring the amount of light incident on the light detection sensor 015 relative to the amount of light emitted from the light source 09. It is to be detected.

  As shown in FIG. 7, the exhaust gas measurement control device 041 includes a light transmittance detection unit 022 for detecting a decrease amount of transmitted light, the light emitting unit lens 011, and the light receiving unit lens 019. Since the lens surface is contaminated by the exhaust gas because it is exposed inside, the exhaust gas pollution degree output unit 024 detects the contamination state, and controls the emission amount and provides the emission amount information to the light transmittance detection unit 022 And a detection light emission control unit 026.

  As a method for measuring the concentration of smoke based on the transmittance of light irradiated into exhaust gas as described above, the technique of Patent Document 1 (Japanese Patent Laid-Open No. 2009-14585) is known. Patent Document 2 (Japanese Patent No. 3185310) is known as a technique for measuring the smoke density based on the reflectance of light.

  In this patent document 2, the output light from the laser light emitting part is diffused and reflected by the exhaust gas, and the laser light receiving part receives the light. Based on the light receiving states at the plurality of light receiving parts, black smoke, white smoke, A technique for determining the state of vapor white smoke or a mixture of both white smoke is shown.

JP 2009-14585 A Japanese Patent No. 3185310

  However, in the method of measuring the smoke concentration based on the transmittance of the light irradiated into the exhaust gas as shown in FIG. 7 and the prior art as shown in FIG. 7, the light irradiated from the light source is transmitted in the exhaust gas passage. In the process of passing through, the progress of the irradiation light is hindered by the shielding action of the fine particles present in the exhaust gas, and the amount of light incident on the light receiving sensor of the light receiving unit is reduced corresponding to the concentration of particulate matter in the exhaust gas. Utilizing this, the concentration of particulate matter is detected. For this reason, when the engine is cold, not only black smoke but also white smoke due to unburned hydrocarbons may be emitted, but it is difficult to measure these black smoke and white smoke simultaneously. there were.

  Further, in Patent Document 2, the laser light is used to receive light that is diffused and reflected by the exhaust gas using the laser light, and the black light, white smoke, and white light are received based on the light receiving states of the plurality of light receiving parts. Although it is possible to determine whether smoke, water vapor white smoke, or both white smoke is mixed, it is necessary to install a plurality of light receiving units, and there is a problem in that the apparatus becomes complicated and large, and the analysis is complicated.

  On the other hand, in the method of measuring the smoke concentration by the transmittance of the light irradiated into the exhaust gas as shown in the prior art as shown in FIG. 7, the light emitting unit lens 011 and the light receiving unit lens 019 are disposed in the exhaust gas passage 03. In the cold region test (temperature minus condition), the light emitting part and the light receiving part are detected by the water vapor in the exhaust gas particularly during the exhaust gas test at the start to detect smoke generated at the start. There is also a problem in that the surface of the optical lens is condensed and cannot be used.

  Therefore, the present invention has been made in view of such a background, and in an exhaust gas measuring device that measures the concentration of smoke by transmitted light of light irradiated into exhaust gas, both white smoke and black smoke are separated. In addition to achieving a measurement device that can measure simultaneously, the lens surface of the light emitting unit and the light receiving unit can be measured without dew condensation due to water vapor in the exhaust gas even in a measurement test in a cold start state below zero. It is an object to provide an exhaust gas measuring device.

In order to solve the above problems, the present invention is directed to an exhaust gas measuring device that analyzes the transmitted light of light irradiated into the exhaust gas of an engine and measures the concentrations of black smoke and white smoke in the exhaust gas. A light emitting unit having a light source and a light receiving unit for detecting transmitted light are provided so that an optical path is formed across the exhaust gas passage, and a transmitted light detection sensor and a transmitted light image for detecting the amount of transmitted light are provided in the light receiving unit. A light transmittance detecting means for detecting smoke concentration in the exhaust gas based on a transmitted light signal from the transmitted light detection sensor, and an image signal from the image reading sensor as a gradation level of black or white a ratio gradient determination was carried out, if the stronger blackness than gradient on the basis light the light source represents the detected density by the optical transmittance detection means, corresponding to the gradient of the black in To determine the density of black smoke, the remainder is determined as the density of the white smoke component, and when the whiteness is stronger than the gradation of the reference light, the density detected by the light transmission detecting means is Image analysis means for obtaining a white smoke density by distributing at a ratio according to the gradation, and obtaining the remainder as a density of a black smoke component .

According to this invention, the smoke (including black smoke and white smoke) concentration in the exhaust gas is calculated by the light transmittance detecting means for detecting the smoke concentration in the exhaust gas based on the transmitted light signal from the transmitted light detection sensor.
Further, the image signal from the image reading sensor is represented by black or white gradation, and the gradation degree is determined, and the smoke density obtained by the light transmission detecting means is detected separately for the white smoke density and the black smoke density. To do.

  That is, a transmitted light image of light transmitted through the exhaust gas is generated by the image reading sensor, and the image reading sensor is, for example, a CCD (charge coupled device) sensor or a CMOS sensor (complementary metal oxide semiconductor) sensor as an imaging device. The image signal from the image reading sensor is represented by a black or white gradation, and the gradation determination is performed. In the gradation degree determination, as shown in FIG. 3, the image is divided into a plurality of zones Zn, and blackness is determined with 256 gradations, for example, black is 0 and white is 255. Then, gradation determination is performed for each zone, and gradation levels are calculated by averaging the gradation levels of all zones.

When the transmitted light is white, that is, in the above example, the higher the gradation, the higher the white smoke emission density, and when the transmitted light is black, that is, the lower the gradation, the higher the black smoke emission density. The smoke (including black smoke and white smoke) concentration in the exhaust gas determined by the light transmittance detection means is detected separately according to the influence of the black smoke and the white smoke according to the gradation level thus calculated.
That is, when the blackness is stronger than the gradation using the light source as the reference light, the density detected by the light transmission detecting means is distributed at a ratio corresponding to the black gradation to obtain the black smoke density. The remainder is obtained as the density of the white smoke component, and when the whiteness is stronger than the gradation of the reference light, the density detected by the light transmittance detecting means is a ratio according to the gradation of the white. Distribute to obtain the white smoke density, and the rest as the density of the black smoke component.
Therefore, it is possible to achieve an exhaust gas measuring device that separates both white smoke and black smoke and simultaneously measures smoke concentration with a simple configuration.

In the present invention, it is preferable that the image analysis unit processes the image signal from the image reading sensor based on real time or a recorded image, and quantifies it in time series and outputs it.
Thus, by processing the image signal from the image reading sensor in real time, the combustion state of the engine at that time can be confirmed and reflected in the adjustment of the engine. Moreover, since it can process also based on a recorded image, the combustion state of an engine can be confirmed repeatedly.

In the present invention, preferably, the light emitting unit and the light receiving unit are provided with a temperature detecting unit and a heating unit, respectively, and the light emitting unit and the light receiving unit including the optical lens in contact with the exhaust gas are controlled to exceed 0 ° C. It is good to provide the heating control means to do.
As a result, even in a measurement test in a cold start state below zero, measurement can be performed without condensation on the lens surfaces of the light emitting part and the light receiving part due to water vapor in the exhaust gas.

In the present invention, preferably, the light receiving unit is provided with a transmitted light detection sensor for detecting a light transmittance, and when the transmitted light from the transmitted light detection sensor does not reach a reference value, the light receiving unit or the light emitting unit. It is preferable to provide exhaust gas pollution degree output means for determining that the optical lens is contaminated with exhaust gas and urging inspection of the light receiving unit or the light emitting unit.
With such a configuration, it is possible to notify that the optical lens of the light receiving unit is contaminated with the exhaust gas, and to promote cleaning of the lens, thereby preventing measurement accuracy from deteriorating and maintaining high measurement accuracy.

Preferably, in the present invention, the light source color of the light source is a reference color, the reference color is an RGB (red, green, blue) component gradation, and the initial set value fluctuates by a predetermined value or more. In this case, it is preferable to provide a temporal change output means that determines that the optical lens of the light receiving unit or the light emitting unit is contaminated with exhaust gas and prompts the inspection of the light receiving unit or the light emitting unit.
With such a configuration, in the determination of the gradation, when the initial set value changes by a predetermined value or more due to a change over time, an inspection is promoted, so that the measurement accuracy can be prevented from being lowered due to the change over time.

The present invention achieves, with a simple configuration, a measurement device capable of separately measuring both white smoke and black smoke and measuring them simultaneously in an exhaust gas measurement device that measures smoke concentration using transmitted light of light irradiated into exhaust gas. be able to.
In addition, it is possible to provide an exhaust gas measuring device that can perform measurement without causing condensation on the lens surfaces of the light emitting part and the light receiving part due to water vapor in the exhaust gas even in a measurement test in a cold start state below zero.
Further, when the optical lens of the light receiving unit is informed that it has been polluted with exhaust gas, prompting the lens to be cleaned, etc. Since the inspection is urged, it is possible to prevent a decrease in measurement accuracy due to a change with time.

It is a whole lineblock diagram showing an embodiment of an exhaust gas measuring device concerning the present invention. It is a flowchart which shows the measurement procedure by an exhaust gas measuring device. It is a conceptual diagram which divides an image into zones. It is explanatory drawing which shows the state of an image change. It is explanatory drawing which shows a gradation change and the density change of white smoke and black smoke. It is explanatory drawing which shows the density | concentration change containing both white smoke and black smoke by a light transmittance. It is a whole block diagram of the conventional light transmission type | mold density | concentration measuring apparatus.

An embodiment of the present invention will be described. FIG. 1 is an overall configuration diagram showing an embodiment of an exhaust gas measuring apparatus according to the present invention.
This embodiment shows about the exhaust gas measuring device of vehicles. An exhaust gas 4 flows in an exhaust gas passage 3 formed in an exhaust pipe 1 connected to each cylinder of an engine (not shown) in the direction of the arrow in FIG. 1 and faces the exhaust pipe 1 so as to cross the exhaust gas flow. A light emitting unit 5 and a light receiving unit 13 are arranged.

  The light emitting unit 5 includes a light source 9, and the light source 9 includes, for example, an LED (issuing diode) and a laser irradiation device, and emits light emitted from the light source 9 to enter the exhaust gas passage 3 as parallel light. The partial lens 11 is exposed in the exhaust gas passage 3.

  In addition, the light receiving unit 13 includes a transmitted light detection sensor 15 and an image reading sensor 17, and further, a light receiving unit lens 19 that collects the parallel light transmitted through the exhaust gas passage 3 and enters the light receiving sensor is provided in the exhaust gas passage 3. It is exposed inside.

As the transmitted light detection sensor 15, for example, a light receiving sensor such as a photodiode is provided to detect the amount of light transmitted through the exhaust gas passage 3.
The image reading sensor 17 generates a transmitted light image of light transmitted through the exhaust gas. For example, the image reading sensor is constituted by a CCD (charge coupled device) sensor or a CMOS sensor (complementary metal oxide semiconductor) sensor as an image pickup device, and an image signal from the image reading sensor 17 is displayed with a black or white gradation. The gradation level is determined.

  The light emitting unit 5 and the light receiving unit 13 are further provided with a heater 21 as a heating unit, respectively, so that the light emitting unit lens 11 and the light receiving unit lens 19 are heated. A temperature sensor 23 serving as a temperature detecting unit is installed in the vicinity of the light emitting unit lens 11 and the light receiving unit lens 19 and is input to the heating control unit 25. The heating control unit 25 controls the heating of the light emitting unit 5 and the light receiving unit 13. Thus, the light-emitting unit lens 11 and the light-receiving unit lens 19 are controlled so as not to fall below 0 ° C.

  The heating control means 25 enables measurement without condensation on the lens surfaces of the light-emitting unit lens 11 and the light-receiving unit lens 19 due to water vapor in the exhaust gas even in a measurement test in a cold start state below zero.

The transmitted light signal from the transmitted light detection sensor 15 is input to the light transmittance detection means 27, and the density of smoke (including both black smoke and white smoke) is calculated based on the transmitted light amount. That is, in the process in which the light emitted from the light source 9 passes through the exhaust gas passage 3, the progress of the irradiation light is hindered by the shielding action of the fine particles present in the exhaust gas 4, corresponding to the concentration of particulate matter in the exhaust gas. Then, using the fact that the amount of light incident on the transmitted light detection sensor 15 of the light receiving unit 13 decreases, the amount of light emitted from the light source 9 and incident on the transmitted light detection sensor 15 with respect to the amount of light is measured. The concentration of the substance is detected.
Information on the amount of irradiation light for calculating the amount of transmitted light is input from the detection light emission control means 29. The detection light emission control means 29 controls the light emission amount by controlling the operation of the light source 9.

  Further, exhaust gas pollution degree output means 31 is provided, and in this exhaust gas pollution degree output means 31, when the transmitted light signal input from the transmitted light detection sensor 15 to the light transmittance detection means 27 does not reach the reference value. Since the detected light quantity is insufficient and the light receiving part lens 19 or the light emitting part lens 11 receives light and is considered to be a decrease in the light emission quantity, the detection light emission control means 29 is controlled to control the light emission quantity. The lens 19 or the light emitting unit lens 11 is polluted to notify that the exhaust gas is polluted with exhaust gas 33, and the lens is urged to be cleaned. By this notification, it is possible to prevent the measurement accuracy from deteriorating and maintain the measurement accuracy at a high level.

  An image signal from the image reading sensor 17 is input to the image analysis unit 35, and a density obtained by separating black smoke and white smoke is calculated. That is, the image signal from the image reading sensor 17 is represented by a black or white gradation, and the gradation determination is performed. In the gradation degree determination, as shown in FIG. 3, the image is divided into a plurality of zones Zn, and blackness is determined with 256 gradations, for example, black is 0 and white is 255. Then, gradation determination is performed for each zone, and gradation levels are calculated by averaging the gradation levels of all zones.

In gradation determination for each zone, whiteness and blackness are determined based on gradation light differences of R (red), G (green), and B (blue) components of the three primary colors of the reference color. That is, when all the R, G, and B component lights are absorbed (for example, all of the R, G, and B gradations are 0), all the light is reflected (for example, all of the R, G, and B gradations are 255). And determined to be white.
Since the white color cannot be judged as white smoke in the white color, it is desirable to set all gradations of R, G, and B to the intermediate gradation of 128, but the light source color R of the light source 9 of the light emitting unit 5 is desirable. Since it is difficult to precisely adjust the G, B components, the reference color is set by performing the initial calibration of the R, G, B components of the light source color that the light source 9 has.

  Since black smoke is a side that absorbs all of R, G, and B light, the R, G, and B components are on the gradation 0 side from the reference light (light source light) level. Since white smoke is a side that reflects all the R, G, and B light, the R, G, and B components are on the gradation 255 side from the reference light (light source light) level. The whiteness and blackness are determined by the gradation difference of the R, G, and B components with respect to the reference light.

FIGS. 4A to 4F show image changes over time by a CCD camera as the image reading sensor 17 when the engine is started.
FIG. 4A shows a state before the engine is started and shows a state of reference light. (B) shows a state where there is a lot of black smoke immediately after the engine is started. (C) shows a state in which white smoke remains while the black smoke after the engine starts decreases. (D) shows almost white smoke after the engine is started. (E) shows a state in which white smoke has almost disappeared after the engine is started. (F) is a state without black smoke and white smoke after the engine stops, and shows a state returned to the state of (a).

  FIG. 5 shows a change state of the gradation obtained by analyzing the image change by the CCD camera of FIG. 4 by the image analysis means 35. FIG. 6 shows a density change state including both black smoke and white smoke with the passage of time after the engine start, which is detected by the light transmittance detecting means 27. Since the density change in FIG. 6 indicates a density change including both black smoke and white smoke, the density detected by the light transmittance detecting means 27 is the level of the black smoke analyzed by the image analyzing means 35. The black smoke density is obtained by distributing at a ratio according to the furniture. The remainder is determined as a concentration as a white smoke component or other water vapor component.

  Similarly, the density can be obtained as a white smoke component in the case of 255 side from the reference value of the gradation. That is, the white smoke density is obtained by distributing the density detected by the light transmittance detecting means 27 at a ratio corresponding to the gradation level of the white smoke analyzed by the image analyzing means 35. The remainder is determined as the concentration as a black smoke component or other water vapor component.

  As described above, it is possible to detect the density by separating the black smoke and the white smoke based on the change in the gradation analyzed by the image analysis means 35 and the density calculated by the light transmittance detection means 27. As a result, the result is output as the analysis result 37.

  The image analysis means 35 for analyzing the image change over time by the CCD camera may analyze the image data from the image reading sensor 17 by real-time input or may process it based on the recorded image by the recording means. By processing the image signal from the image reading sensor 17 in real time, the combustion state of the engine at that time can be confirmed and reflected in the adjustment of the engine. Moreover, since it can process also based on a recorded image, the combustion state of an engine can be confirmed repeatedly.

  The image analysis unit 35 performs initial calibration using the light source as a reference light and the reference light as an initial setting value of RGB (red, green, and blue) component gradations. The initial setting value is a predetermined value. When the value fluctuates to the black side (R, G, B components are on the gradation 0 side) or more than the predetermined value, or changes to the white side (R, G, B components are to the gradation 255 side) more than a predetermined value, the light receiving unit 13 or an optical lens of the light-emitting unit 5 is determined to be contaminated with exhaust gas, and a time-change output means 39 that prompts inspection of the light-receiving unit 13 or the light-emitting unit 5 is provided. In the determination of the degree of gradation, when the initial setting value is shifted and changed by a predetermined value or more due to a change with time, the inspection is promoted, so that the measurement accuracy can be prevented from being lowered due to the change with time.

  The exhaust gas measurement control device 41 includes the heating control means 25, the light transmission degree detection means 27, the exhaust gas pollution degree output means 31, the image analysis means 35, and the detection light emission control means 29 described above.

Next, the measurement procedure of the exhaust gas measurement control device 41 will be described with reference to FIG.
First, when measurement is started, in step S1, it is determined whether or not the detection value of the transmitted light detection sensor 15 has reached the reference value. If not, the exhaust gas pollution degree output means 31 is detected in step S2. The lens 19 or the light emitting unit lens 11 is prompted to be cleaned.

  In the case of Yes in step S1, the process proceeds to step S3, and initial calibration is performed with the light emission color of the light source 9. In step S4, it is determined whether the initial setting value by the initial calibration has shifted to the black side (R, G, B components are the gradation 0 side) or the white side by a predetermined value or more.

  If it is shifted by a predetermined value or more, it is determined in step S5 that the optical lens of the light receiving unit 13 or the light emitting unit 5 is contaminated by exhaust gas by the time-change output means 39, and the light receiving unit 13 or the light emitting unit 5 is determined. Encourage inspection.

  If it is determined in step S4 that the shift is not greater than the predetermined value, the process proceeds to step S6, where it is determined whether or not the detected temperature T from the temperature sensor 23 is T ≦ 0 ° C. If it is 0 ° C. or lower, the heater 21 is controlled by the heating control means 25 so as not to be 0 ° C. or lower in step S7.

  When the warm-up is completed and the temperature exceeds 0 ° C., the process proceeds to step S8, where the light transmittance is measured by the light transmittance detector 27 based on the transmitted light signal from the transmitted light detection sensor 15. Calculate and calculate the total smoke concentration including black smoke and white smoke. In step S9, the image analysis means 35 calculates the density by separating the density of white smoke and black smoke based on the image signal from the image reading sensor 17, and outputs it as a measurement result in step S10. .

According to the present embodiment, when the transmitted light is white, that is, as the gradation level is larger toward 255, the white smoke emission density is larger. When the transmitted light is black, that is, as the gradation degree is smaller toward 0, the black color is smaller. High smoke emission concentration. The smoke (including black smoke and white smoke) concentration in the exhaust gas determined by the transmitted light detection sensor that detects the transmitted light amount is separated into the influence of black smoke and white smoke according to the calculated gradation. Can be detected.
As a result, an exhaust gas measuring device that separates both white smoke and black smoke and can simultaneously measure the smoke concentration can be achieved with a simple configuration.

  According to the present invention, in the exhaust gas measuring device that measures the concentration of smoke by the transmitted light of the light irradiated into the exhaust gas, the measuring device that can measure both white smoke and black smoke simultaneously can be measured with a simple configuration. In addition, it is possible to provide an exhaust gas measuring device that can perform measurement without causing condensation on the lens surfaces of the light emitting unit and the light receiving unit due to water vapor in the exhaust gas even in a measurement test in a cold start state below zero. In addition, when the optical lens of the light receiving unit is informed that it has been contaminated with exhaust gas, prompting the lens to be cleaned, etc., and when the initial setting value in the determination of the gradation level due to change over time has changed by a predetermined value or more due to change over time In order to prompt inspection, it is possible to prevent a decrease in measurement accuracy due to changes over time, which is suitable for use in an exhaust gas measuring device.

DESCRIPTION OF SYMBOLS 1 Exhaust pipe 3 Exhaust gas passage 5 Light emission part 9 Light source 11 Light emission part lens (optical lens)
DESCRIPTION OF SYMBOLS 13 Light-receiving part 15 Transmitted light detection sensor 17 Image reading sensor 19 Light-receiving part lens (optical lens)
21 Heating means (heater)
23 Temperature detection means (temperature sensor)
25 Heating control means 29 Detection light emission control means 31 Exhaust gas pollution degree output means 35 Image analysis means 39 Aging change output means

Claims (5)

In the exhaust gas measuring device that analyzes the transmitted light of the light irradiated into the exhaust gas of the engine and measures the concentration of black smoke and white smoke in the exhaust gas,
A light emitting part having a light source and a light receiving part for detecting transmitted light so that an optical path is formed across the exhaust gas passage through which the exhaust gas is introduced, and a transmitted light detection sensor for detecting the amount of transmitted light; An image reading sensor for generating a transmitted light image;
A light transmittance detecting means for detecting smoke concentration in the exhaust gas based on a transmitted light signal from the transmitted light detection sensor;
The image signal from the image reading sensor is represented by a black or white gradation, and the gradation is determined. If the degree of black is higher than the gradation using the light source as a reference light, the light transmission detecting means detects the gradation. The obtained density is distributed at a ratio according to the gradation of black to obtain a black smoke density, and the rest is obtained as a density of white smoke component. When the whiteness is stronger than the gradation of the reference light, Image analysis means for determining the white smoke density by distributing the density detected by the light transmittance detection means at a ratio according to the white gradation, and calculating the density of the black smoke component. A featured exhaust gas measuring device.   2. The exhaust gas measuring apparatus according to claim 1, wherein the image analysis means processes an image signal from the image reading sensor based on real time or a recorded image, and quantifies and outputs in time series.   Each of the light emitting unit and the light receiving unit includes a temperature detecting unit and a heating unit, and includes a heating control unit that controls the light emitting unit and the light receiving unit including the optical lens in contact with the exhaust gas to exceed 0 ° C. The exhaust gas measuring device according to claim 1.   When the transmitted light from the transmitted light detection sensor does not reach the reference value, it is determined that the optical lens of the light receiving unit or the light emitting unit is contaminated with the exhaust gas, and the exhaust gas pollution degree is urged to check the light receiving unit or the light emitting unit. The exhaust gas measuring device according to claim 1, further comprising an output unit.   When the light source color of the light source is a reference color, the reference color is an RGB (red, green, blue) component gradation, and an initial setting value, and when the initial setting value fluctuates by a predetermined value or more, a light receiving unit or a light emitting unit 2. The exhaust gas measuring device according to claim 1, further comprising a time-change output means for determining that the optical lens is contaminated with exhaust gas and prompting inspection of the light receiving unit or the light emitting unit.

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