Intelligent digital metering system and method for smoke intensity of automobile exhaust gas

Abstract

The invention discloses an automobile exhaust gas smoke intensity intelligent digital metering system and method, and the method comprises the steps: a pretest stage: assembling the gas smoke intensity intelligent digital metering system, inserting a sampling probe of a light-proof smoke meter into an automobile exhaust pipe, and inserting an optical filter into a calibration port of a gas chamber of the light-proof smoke meter; the automobile is set to work at the limited measurement power, so that the exhaust smoke intensity of the automobile is stable, the absolute error and the relative error of the lightproof smoke meter are calculated based on the optical filters, and the optical filters meeting the requirements are screened out; in the formal metering stage, the actual measurement value of the lightproof smokemeter is corrected based on the relative error of the lightproof smokemeter calculated in the pretest stage, the actual measurement value is stored, audited, analyzed and calculated, and a verification item electronic report of the verified equipment is generated; according to the invention, standard measurement values and actual measurement values of the metering detection equipment and the detected equipment are recorded synchronously, and an electronic verification report can be generated accordingly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of exhaust gas smoke measurement technology, and particularly relates to an intelligent digital measurement system and method for automobile exhaust gas smoke. BACKGROUND

[0002] The automobile exhaust gas smoke refers to the concentration index of solid particles in the exhaust gas, which is usually expressed by the light absorption coefficient (smoke value) and ranges from 0 to 10, and the larger the value is, the more serious the emission pollution is. The national standard requires that the smoke value should not exceed 1.0, and the light absorption rate of the particulate matter in the exhaust gas is measured by using a smoke meter. The detection method is measured by a smoke meter, the smoke meter traps the particulate matter in the exhaust gas by using filter paper and measures the light absorption rate, and the detection process needs to be repeated three times to take the average value. If the value exceeds 1.0, it is determined that the emission is over-standard.

[0003] The existing motor vehicle inspection and detection institution detects the equipment measurement and verification in the mode of manual field operation + paper record, which has certain disadvantages and cannot trace the accuracy of the measurement data in the verification process. SUMMARY

[0004] The present application aims to provide an intelligent digital measurement system and method for automobile exhaust gas smoke, to solve the technical problem that the accuracy of the measurement data in the verification process cannot be traced in the prior art.

[0005] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0006] An intelligent digital measurement system for automobile exhaust gas smoke comprises:

[0007] An opaque smoke meter, whose sampling probe is inserted into the automobile exhaust pipe to measure the smoke of the vehicle exhaust gas;

[0008] A data acquisition instrument, which is connected in communication with the opaque smoke meter and is used to collect the data measured by the opaque smoke meter, the data serving as the actual measurement value of the opaque smoke meter;

[0009] A filter, which is inserted into the calibration port of the gas chamber of the opaque smoke meter and is used to measure the interference light filtered from the automobile exhaust pipe;

[0010] A host computer, which is connected in communication with the opaque smoke meter, is used to control the opaque smoke meter to perform the gas smoke verification test, and is used to read the opacity value measured by the opaque smoke meter through the filter, the opacity value being the standard measurement value measured by the opaque smoke meter after the filter is inserted;

[0011] The master computer calculates the measurement error of the opacity smoke meter based on the error between the opacity values measured multiple times, and automatically corrects the actual measurement values collected by the data collector in combination with the measurement error.

[0012] As a preferred scheme of the present application, the master computer regulates the opacity values measured multiple times by the opacity smoke meter after filtering by the optical filter, calculates the relative error and absolute error of the opacity values measured multiple times, to obtain the measurement error of the opacity smoke meter.

[0013] The formula for calculating the absolute error is:

[0014] Where xi is the opacity value measured by the opacity smoke meter for the ith time, and xi is the opacity value measured by the opacity smoke meter for the ith time.

[0015] The formula for calculating the relative error is:

[0016] α = Δ / x1 x 100%;

[0017] Where Δ is the absolute error, and xi is the opacity value measured by the opacity smoke meter for the ith time.

[0018] As a preferred scheme of the present application, the vehicle is operated at a defined measurement power so that the exhaust smoke of the vehicle is stable, and the opacity smoke meter is used to calculate the corresponding exhaust smoke when the vehicle is operated at a defined measurement power for a single time, to form a two-dimensional curve graph of the exhaust smoke-vehicle operation time, and the master computer filters out the data of the front and rear periods of the vehicle operation time, to retain the exhaust smoke corresponding to the stable period of the exhaust smoke of the vehicle.

[0019] The error between the filtered opacity values is used to calculate the measurement error of the opacity smoke meter.

[0020] As a preferred scheme of the present application, the calculated relative error and absolute error are compared with the corresponding determination limit values, respectively, and when the relative error and absolute error exceed the corresponding determination limit values, the optical filter is changed, and an optical filter with a different light transmittance value is inserted into the calibration port of the opacity smoke meter chamber, to calculate the relative error and absolute error of the standard measurement value of each opacity smoke meter, respectively.

[0021] The quartiles of the relative error and absolute error are calculated, respectively, to represent the central tendency and dispersion of the standard measurement value filtered by each optical filter, and then the optical filter with small central tendency and dispersion is selected.

[0022] As a preferred scheme of the present application, the actual measurement value of the light-proof smoke meter is corrected based on the corresponding calculated relative error of the selected light-proof smoke meter.

[0023] As a preferred scheme of the present application, the programmable switch and the intelligent digitalized metrological certification management platform are further included.

[0024] The data acquisition instrument transmits the corrected actual measurement value of the light-proof smoke meter to the programmable switch.

[0025] The programmable switch transmits the collected data acquired by the data acquisition instrument to the intelligent digitalized metrological certification management platform through the Internet.

[0026] The intelligent digitalized metrological certification management platform stores, audits, analyzes and calculates the acquired metrological item standard measurement value and actual measurement value, and generates the electronic report of the tested equipment.

[0027] In addition, the present application further provides a metrological method of the intelligent digitalized metrological system for automobile exhaust gas smoke, which comprises the following steps:

[0028] Step 100, pre-test stage: assemble the gas smoke intelligent digitalized metrological system, insert the sampling probe of the light-proof smoke meter into the automobile exhaust pipe, and insert the optical filter into the calibration port of the gas chamber of the light-proof smoke meter.

[0029] Step 200, set the automobile to work at a defined measurement power, so that the exhaust smoke of the automobile is stable, calculate the absolute error and relative error of the light-proof smoke meter based on the optical filter, and select the optical filter meeting the requirements.

[0030] Step 300, formal metrological stage: correct the actual measurement value of the light-proof smoke meter based on the relative error of the light-proof smoke meter calculated in the pre-test stage, store, audit, analyze and calculate the actual measurement value, and generate the electronic report of the tested equipment.

[0031] As a preferred scheme of the present application, in step 200, the automobile exhaust pipe is in an open state, and the sampling probe of the light-proof smoke meter is inserted into the automobile exhaust pipe.

[0032] Set the automobile to intermittently work at a defined measurement power, and correspondingly acquire the exhaust smoke measured by the light-proof smoke meter when the automobile works at the defined measurement power each time, so that the light-proof smoke meter can measure the corresponding exhaust smoke when the automobile works each time, wherein the same time length is continuously monitored each time the exhaust smoke is measured.

[0033] A front period of the continuous monitoring period of each exhaust smoke test is intercepted to obtain a time period of the exhaust smoke distribution set.

[0034] As a preferred scheme of the present application, the standard measurement values of the light-proof smoke meter measured after the multiple filtering of each filter are calculated respectively, and the relative error and absolute error of the light-proof value corresponding to each filter are calculated;

[0035] The quartiles of the relative error and absolute error are calculated respectively to represent the central tendency and dispersion degree of the standard measurement values after the filtering of each filter, and then the filter with small central tendency and dispersion degree is selected as the qualified filter to be used in the formal measurement stage.

[0036] As a preferred scheme of the present application, in the step 300, the actual measurement value of the light-proof smoke meter is corrected based on the relative error of the pre-test stage to obtain the actual measurement value compensated for the system error of the light-proof smoke meter;

[0037] A distribution curve of the actual measurement value is generated, and the emission characteristics of the transient soot and other visible pollutants of the automobile are calculated in combination with the distribution curve.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] The present application adopts the assessment mode of manual field operation + internet electronicization and digitization recording, which is realized by the combination of the standard measurement detection equipment, data acquisition instrument, program-controlled switch and intelligent digital measurement authentication management platform, and the standard measurement value and actual measurement value of the measurement detection equipment and the detected equipment are recorded synchronously. After the numerical comparison and calculation analysis, the detection result is determined, and the electronic detection report is generated.

[0040] The system error of the light-proof smoke meter itself is measured through the pre-measurement work of the filter, the actual measurement value of the light-proof smoke meter for measuring the exhaust smoke of the automobile is corrected based on the system error, and thus the accuracy of the detection result is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical schemes in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and other implementation drawings can be obtained according to the provided drawings without creative labor for those skilled in the art.

[0042] Figure 1 The structural block diagram of the digital measurement system of the embodiment of the present application;

[0043] Figure 2 This is a flowchart illustrating the digital measurement method according to an embodiment of the present invention;

[0044] The labels in the diagram represent the following:

[0045] 1-Opaque smoke meter; 2-Data acquisition instrument; 3-Main control computer; 4-Filter; 5-Programmable switchboard; 6-Intelligent digital metrology certification management platform. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, the present invention provides an intelligent digital metering system for automobile emission gas smoke opacity, including: an opacity meter 1, a data acquisition instrument 2, a filter 4, and a main control computer 3.

[0048] The sampling probe of the opacity meter 1 is inserted into the exhaust pipe of a car to measure the smoke opacity of the vehicle's exhaust gases. When the sampling probe is inserted into the exhaust pipe, the exhaust pipe is in an open, non-closed state, which allows for the free-flowing measurement of the smoke opacity of the vehicle's exhaust gases.

[0049] The data acquisition instrument 2 is connected to the opacity meter 1 for communication and is used to collect the data measured by the opacity meter 1. This data is used as the actual measured value of the opacity meter 1.

[0050] Filter 4 is inserted into the calibration port of the air chamber of the opacity meter 1 to measure and filter interfering light in the car exhaust pipe. Filter is an optical filter that can filter out unwanted spectral components or interfering light in the incident light, reduce interference components in the background, improve the contrast of the target against the background, and thus improve the signal-to-noise ratio of the system.

[0051] The main control computer 3 is connected to the opacity meter 1 and is used to control the opacity meter 1 to perform gas smoke verification tests. The main control computer 3 is also used to read the opacity value measured by the opacity meter 1 after the filter 4 is inserted. This opacity value is the standard measurement value measured by the opacity meter 1 after the filter 4 is inserted.

[0052] The main control computer 3 calculates the measurement error of the opacity meter 1 based on the error between multiple measurements of opacity values, and automatically corrects the actual measurement values ​​collected by the data acquisition instrument 2 in combination with the measurement error.

[0053] In the embodiment, the non-light-transmitting smoke meter 1 can not only measure black smoke in diesel engine exhaust, but also measure blue smoke and white smoke emissions, has strong measurement capability for low-concentration visible pollutants, and can realize continuous measurement of exhaust smoke.

[0054] Therefore, the non-light-transmitting smoke meter 1 can be used to study the emission characteristics of transient soot and other visible pollutants of diesel engines, and also meets the measurement requirements of free acceleration smoke in emission regulations. The filter 4 is specifically used to reflect the intensity of the transmitted light attenuated after being filtered by the filter 4 after light irradiation. The intensity of the transmitted light attenuation is represented by the light blocking degree of the filter 4, and then the specific light blocking degree value is measured by using the non-light-transmitting smoke meter 1. The stability of the specific light blocking degree value measured by the non-light-transmitting smoke meter 1 is analyzed to measure the system error existing in the non-light-transmitting smoke meter 1 itself.

[0055] After measuring the system error existing in the non-light-transmitting smoke meter 1 itself, the actual measurement value measured by the non-light-transmitting smoke meter 1 is corrected. The data acquisition instrument 2 is mainly used to collect the corrected actual measurement value, and further, the data acquisition instrument 2 collects the corrected actual measurement value, and subsequently stores, reviews, analyzes, and calculates the actual measurement value to generate an electronic report of the detection project of the detected equipment.

[0056] The main control computer 3 controls the non-light-transmitting smoke meter 1 to measure the light blocking degree value filtered by the filter 4 multiple times, calculates the relative error and absolute error of the light blocking degree value measured multiple times, and obtains the measurement error of the non-light-transmitting smoke meter 1.

[0057] The calculation formula of the absolute error is:

[0058] Wherein, xi is the light blocking degree value measured by the non-light-transmitting smoke meter 1 for the i-th time, and x1 is the light blocking degree value measured by the non-light-transmitting smoke meter 1 for the i-th time.

[0059] The calculation formula of the relative error is:

[0060] α = Δ / x1 × 100%;

[0061] Wherein, Δ is the absolute error, and x1 is the light blocking degree value measured by the non-light-transmitting smoke meter 1 for the i-th time.

[0062] The absolute error reflects the specific deviation of the measured value from the true value, and has a unit; the relative error is the ratio of the deviation to the true value, which is dimensionless and is used for cross-order comparison. In the present embodiment, when the opacity smoke meter 1 is used to measure the opacity value filtered by the filter 4 multiple times, there are two errors, one is the measurement error caused by the quality problem of the filter 4 itself, and the other is the system error of the opacity smoke meter 1 itself.

[0063] Since the system error of the opacity smoke meter 1 itself in measuring the opacity value is in a stable state and does not cause the measured value of the exhaust smoke of the opacity smoke meter 1 to change suddenly, the filter 4 corresponding to the absolute error of the measured value of the exhaust smoke that changes suddenly is screened out, which means that the quality of the filter 4 itself has a problem, and the filter 4 with stable absolute error of the measured value of the exhaust smoke is retained. Then, based on the opacity measurement result of the filter 4 by the opacity smoke meter 1, the system error of the opacity smoke meter 1 itself can be calculated.

[0064] In order to identify the measurement error caused by the quality problem of the filter 4 itself, the present embodiment specifically provides a solution:

[0065] The car is operated at a defined measurement power so that the exhaust smoke of the car is stable, and the opacity smoke meter 1 is used to calculate the exhaust smoke corresponding to the single operation of the car at the defined measurement power, to form a two-dimensional curve graph of the exhaust smoke and the operation time of the car. The host computer 3 filters out the data of the front period and the rear period of the operation time of the car to retain the exhaust smoke corresponding to the stable period of the exhaust smoke of the car. The error between the filtered opacity values is used to calculate the measurement error of the opacity smoke meter 1.

[0066] In the present embodiment, the opacity smoke meter 1 is used to measure the opacity value once when the car is started at a defined measurement power for a single time, and the opacity smoke meter 1 is used to measure the opacity value multiple times when the car is started at a defined measurement power for multiple times.

[0067] In addition, since the exhaust smoke of the car is unstable when the car is started at a defined measurement power, it is necessary to filter out the period when the exhaust smoke of the car is unstable and retain the period when the exhaust smoke is stable. The error between the filtered opacity values is used to calculate the measurement error of the opacity smoke meter 1, which can exclude the measurement error caused by the quality problem of the filter 4 itself.

[0068] The implementation of specifically screening out the measurement error caused by the quality problem of the filter 4 itself is:

[0069] The calculated relative error and absolute error are compared with the corresponding determination limit, and when the relative error and absolute error exceed the corresponding determination limit, the filter 4 is changed, and a filter 4 with a different light transmittance value is inserted into the calibration port of the non-transparent smoke meter 1 gas chamber to calculate the relative error and absolute error of the standard measurement value of each non-transparent smoke meter 1, respectively.

[0070] The quartiles of the relative error and absolute error are calculated respectively to represent the central tendency and dispersion of the filtered standard measurement value of each filter 4, and then the filter 4 with small central tendency and dispersion is selected.

[0071] The absolute error of each type of filter 4 is arranged from small to large and divided into four equal parts, and the values at the three division points are called quartiles. There are three quartiles, which are the lower quartile, the median and the upper quartile from small to large, represented by Q1, Q2 and Q3 respectively. 25% of the data is less than or equal to Q1, 50% of the data is less than or equal to Q2, and 75% of the data is less than or equal to Q3.

[0072] The quartiles, as a form of quantile, can quickly show the central tendency and dispersion of the data to understand the overall distribution of the absolute error data. The above "25% of the data is less than or equal to Q1, 50% of the data is less than or equal to Q2, and 75% of the data is less than or equal to Q3" is used as a screening condition to exclude filters 4 that cannot meet the above conditions.

[0073] The remaining filters 4 that meet the above conditions represent the system error of the non-transparent smoke meter 1 itself based on the relative error of the standard measurement value measured by the non-transparent smoke meter 1, and the system error of the non-transparent smoke meter 1 itself is used as a correction value to correct the actual smoke measurement value of the vehicle exhaust gas measured by the non-transparent smoke meter 1, i.e. based on the relative error calculated by the selected non-transparent smoke meter 1.

[0074] In addition, the application also includes a program-controlled switch 5 and an intelligent digital metering authentication management platform 6.

[0075] The data acquisition instrument 2 transmits the corrected actual measurement value of the non-transparent smoke meter 1 to the program-controlled switch 5. The data acquisition instrument 2 is connected in communication with the non-transparent smoke meter 1 for collecting data measured by the non-transparent smoke meter 1, which is used as the actual measurement value of the verification data, and transmits the collected data to the program-controlled switch 5.

[0076] The program-controlled switch 5 transmits the collected data collected by the data acquisition instrument 2 to the intelligent digital metering authentication management platform 6 through the Internet.

[0077] The intelligent digital metrological authentication management platform 6 stores, audits, analyzes and calculates the standard measurement value and the actual measurement value of the measurement item to generate an electronic report of the tested equipment.

[0078] The intelligent digital metrological authentication management platform 6 can be in communication connection with a mobile front end, such as a mobile phone app, to view the electronic report of the tested equipment, i.e., the car, the real-time data of the testing process, the testing equipment information and the testing validity period and the like.

[0079] In addition, as Figure 2 shown, the application further provides a metrological method of the intelligent digital metrological system for automobile exhaust gas smoke intensity, comprising the following steps:

[0080] Step 100, pre-test stage: assemble the gas smoke intensity intelligent digital metrological system, insert the sampling probe of the light-tight smoke intensity meter into the automobile exhaust pipe, and insert the optical filter into the calibration port of the gas chamber of the light-tight smoke intensity meter;

[0081] Step 200, set the automobile to work at a defined measurement power to stabilize the exhaust smoke intensity of the automobile, calculate the absolute error and the relative error of the light-tight smoke intensity meter based on the optical filter, and select the optical filter meeting the requirements;

[0082] Step 300, formal metrological stage: correct the actual measurement value of the light-tight smoke intensity meter based on the relative error of the light-tight smoke intensity meter calculated in the pre-test stage, store, audit, analyze and calculate the actual measurement value to generate an electronic report of the tested equipment.

[0083] In step 200, the automobile exhaust pipe is in an open state, and the sampling probe of the light-tight smoke intensity meter is inserted into the automobile exhaust pipe;

[0084] Set the automobile to work intermittently at a defined measurement power, and correspondingly acquire the exhaust smoke intensity measured by the light-tight smoke intensity meter each time the automobile works at the defined measurement power, so that the light-tight smoke intensity meter can measure the corresponding exhaust smoke intensity each time the automobile works, wherein the same duration is continuously monitored each time the exhaust smoke intensity is measured;

[0085] Intercept the front duration of the continuously monitored duration each time the exhaust smoke intensity is measured to obtain a time period in which the exhaust smoke intensity is concentrated.

[0086] Calculate the standard measurement value of the light-tight smoke intensity meter measured after the exhaust smoke intensity is filtered by each optical filter for multiple times, and calculate the relative error and the absolute error of the light-tight smoke intensity value corresponding to each optical filter;

[0087] The quartiles of the relative error and the absolute error are calculated respectively to represent the central tendency and the dispersion degree of the standard measurement value of each filter respectively, and then the filter with small central tendency and dispersion degree is selected as the qualified filter to be used in the formal measurement stage.

[0088] In step 300, the actual measurement value of the opacity smoke meter is corrected based on the relative error calculated in the pre-test stage to obtain the actual measurement value of the opacity smoke meter compensated for the system error of the opacity smoke meter.

[0089] A distribution curve of the actual measurement value is generated, and the emission characteristics of the transient soot and other visible pollutants of the automobile are calculated based on the distribution curve.

[0090] The filter is a metered lens mainly used for reflecting the intensity of the transmitted light after the light irradiates the filter lens, and the value is the opacity of the filter, which is used as the standard measurement value of the filter.

[0091] In the metering and testing process, the filter is inserted into the calibration port of the opacity smoke meter chamber, the host computer runs the opacity smoke meter gas smoke testing program, reads the opacity value measured by the opacity smoke meter, and takes the value of the metered filter as the standard measurement value. The measurement error of the opacity smoke meter is calculated by the relative error and absolute error calculation formula, and the measurement error value is compared with the limit error specified in the testing procedure. If the measurement error value is less than the limit error, the opacity smoke meter is determined to be qualified, otherwise, the opacity smoke meter is determined to be unqualified.

[0092] Different values of high, medium and low filters are required in the testing process to select the qualified opacity smoke meter.

[0093] The implementation mode of the present embodiment adopts manual on-site operation + Internet electronicization and digitization recording, which is realized by combining the standard metering and testing equipment, the data acquisition instrument, the program-controlled switch and the intelligent digital metering and testing authentication management platform to synchronously record the standard measurement value and the actual measurement value of the metering and testing equipment and the tested equipment. After the numerical comparison and calculation analysis, the testing result is determined, and the electronic testing report is generated.

[0094] The system error of the opacity smoke meter itself is calculated through the pre-measurement of the filter, and the actual measurement value of the opacity smoke meter for measuring the exhaust smoke of the automobile is corrected based on the system error, so as to improve the accuracy of the testing result.

[0095] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. An intelligent digital metering system for automobile exhaust gas smoke intensity, characterized in that, It comprises: An opaque smoke meter (1) with a sampling probe inserted into the exhaust pipe of a vehicle to measure the smoke of the exhaust gas of the vehicle; A data acquisition instrument (2) connected in communication with the opaque smoke meter (1) to collect data measured by the opaque smoke meter (1) as actual measurement values of the opaque smoke meter (1); A filter (4) inserted into the calibration port of the gas chamber of the opaque smoke meter (1) to measure the filtered interference light in the exhaust pipe of the vehicle; A host computer (3) connected in communication with the opaque smoke meter (1) to control the opaque smoke meter (1) to perform gas smoke detection test, and the host computer (3) is used to read the opacity value measured by the opaque smoke meter (1) through the filter (4), which is the standard measurement value measured by the opaque smoke meter (1) after the filter (4) is inserted; The host computer (3) calculates the measurement error of the opaque smoke meter (1) based on the error between the opacity values measured multiple times, and automatically corrects the actual measurement values collected by the data acquisition instrument (2) combined with the measurement error.

2. The intelligent digital measurement system for the smoke of the exhaust gas of a vehicle according to claim 1, wherein The host computer (3) controls the opaque smoke meter (1) to measure the opacity value filtered by the filter (4) multiple times, calculates the relative error and absolute error of the opacity values measured multiple times to obtain the measurement error of the opaque smoke meter (1); The absolute error is calculated according to the following formula: Wherein, xi is the opacity value measured by the opaque smoke meter (1) for the i-th time, x1 is the opacity value measured by the opaque smoke meter (1) for the i-th time; The relative error calculation formula is: Alpha = delta / x1*100%; Wherein, delta is the absolute error, and x1 is the opacity value measured by the opaque smoke meter (1) for the i-th time.

3. The intelligent digital measurement system for the smoke of the exhaust gas of a vehicle according to claim 1, wherein The vehicle is operated at a defined measurement power to stabilize the exhaust smoke of the vehicle, and the opaque smoke meter (1) is used to calculate the exhaust smoke corresponding to the single operation of the vehicle at the defined measurement power to form a two-dimensional curve graph of the exhaust smoke-vehicle operation time, and the host computer (3) filters out the data of the front period and the rear period of the vehicle operation time to retain the exhaust smoke corresponding to the stable period of the exhaust smoke of the vehicle; The error between the filtered opacity values is used to calculate the measurement error of the opaque smoke meter (1).

4. The intelligent digital measurement system for the smoke of the exhaust gas of a vehicle according to claim 2, wherein The calculated relative error and absolute error are compared with the corresponding determination limit, and when the relative error and absolute error exceed the corresponding determination limit, the filter (4) is changed, and a filter (4) with a different light transmittance is inserted into the calibration port of the gas chamber of the non-transparent smoke meter (1) to calculate the relative error and absolute error of the standard measurement value of each non-transparent smoke meter (1), respectively. The quartiles of the relative error and absolute error are calculated to represent the central tendency and dispersion of the standard measurement value filtered by each filter (4), and then the filter (4) with small central tendency and dispersion is selected.

5. The intelligent digital measurement system for automobile exhaust gas smoke according to claim 4, characterized in that, The actual measurement value of the non-transparent smoke meter (1) is corrected based on the corresponding calculated relative error of the selected non-transparent smoke meter (1).

6. The intelligent digital measurement system for automobile exhaust gas smoke according to claim 1, characterized in that, It further comprises a program-controlled switch (5) and an intelligent digital measurement authentication management platform (6); The data acquisition instrument (2) transmits the corrected actual measurement value of the non-transparent smoke meter (1) to the program-controlled switch (5); The program-controlled switch (5) transmits the collected data collected by the data acquisition instrument (2) to the intelligent digital measurement authentication management platform (6) through the Internet; The intelligent digital measurement authentication management platform (6) stores, audits, analyzes, and calculates the standard measurement value and the actual measurement value to generate an electronic report of the tested equipment.

7. A metering method based on the intelligent digital metering system for automobile exhaust gas smoke intensity according to any one of claims 1-6, characterized in that, The steps include: Step 100, pre-test stage: assemble the gas smoke intelligent digital measurement system, insert the sampling probe of the non-transparent smoke meter into the automobile exhaust pipe, and insert the filter into the calibration port of the gas chamber of the non-transparent smoke meter; Step 200, set the automobile to work at a defined measurement power to stabilize the exhaust smoke of the automobile, calculate the absolute error and relative error of the non-transparent smoke meter based on the filter, and select the filter that meets the requirements; Step 300, formal measurement stage: correct the actual measurement value of the non-transparent smoke meter based on the relative error of the non-transparent smoke meter calculated in the pre-test stage, store, audit, analyze, and calculate the actual measurement value to generate an electronic report of the tested equipment.

8. The measurement method according to claim 1, characterized in that, In step 200, the automobile exhaust pipe is in an open state, and the sampling probe of the non-transparent smoke meter is inserted into the automobile exhaust pipe; Set the automobile to work intermittently at a defined measurement power, and correspondingly obtain the exhaust smoke measured by the non-transparent smoke meter when the automobile works at the defined measurement power each time, so that the non-transparent smoke meter can measure the corresponding exhaust smoke when the automobile works each time, and the same duration is continuously monitored each time the exhaust smoke is measured; The front duration of the continuously monitored duration when measuring the exhaust smoke each time is intercepted to obtain the time period of the exhaust smoke distribution center. 9.The intelligent digital measurement system and method for automobile exhaust gas smoke intensity according to claim 8, characterized in that, the standard measurement values of the light-proof smoke meter after multiple filtering of each filter are calculated respectively, and the relative error and absolute error of the light-proof value corresponding to each filter are calculated; the quartiles of the relative error and absolute error are calculated respectively to represent the central tendency and dispersion degree of the standard measurement values after filtering of each filter, and then the filter with small central tendency and dispersion degree is selected as the qualified filter for use in the formal measurement stage. 10.The intelligent digital measurement system and method for automobile exhaust gas smoke intensity according to claim 9, characterized in that, in the step 300, the actual measurement values of the light-proof smoke meter are corrected based on the relative error of the pre-test stage to obtain the actual measurement values compensated for the system error of the light-proof smoke meter; the distribution curve of the actual measurement values is generated, and the emission characteristics of the instantaneous soot and other visible pollutants of the automobile are calculated in combination with the distribution curve.

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