CN115097071A - Heavy-duty diesel vehicle exhaust pollutant testing method - Google Patents
Heavy-duty diesel vehicle exhaust pollutant testing method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a method for testing exhaust pollutants of a heavy-duty diesel vehicle, belonging to the field of testing the exhaust pollutants of the diesel vehicle; comparing two collection modes of a first exhaust collection mode and a second exhaust collection mode, and analyzing a rotating speed range according to the actual rotating speed condition of the heavy-duty diesel vehicle in the actual transportation process to determine the collection rotating speed so as to obtain a collection rotating speed group consisting of a plurality of collection rotating speeds; then collecting the exhaust gas at each acquisition rotating speed corresponding to the acquisition rotating speed group, and discharging the exhaust gas into a vacuum detection box; correspondingly detecting a gas concentration group I and a gas concentration group II of the collected waste gas group; divide the gas concentration two that all collection waste gases correspond by gas concentration one, obtain the correction value to establish the correction model between gathering rotational speed and the correction value, actual conditions is pressed close to more to this correction model, and the follow-up measurement of being convenient for is more accurate.
Description
Technical Field
The invention relates to the technical field of exhaust pollutant testing, in particular to a method for testing exhaust pollutants of a heavy-duty diesel vehicle.
Background
The patent with publication number CN106198332A discloses a portable vehicle-mounted test system for particulate matters discharged by diesel vehicle exhaust; the system measures PM2.5, PM10 and total particles discharged by the diesel vehicle in real time, conducts multi-channel parallel sampling, can accurately measure particulate matters discharged by the diesel vehicle under real working conditions, and collected real-time data can be used for quantitatively evaluating particulate matter discharge of various diesel vehicles.
For the test of exhaust pollutants of a heavy diesel vehicle, in the prior art, the following methods are adopted for treating the tail gas of the heavy diesel vehicle, and specifically are as follows:
(1) an Oxidation Catalytic Converter (OCC) for the oxidation removal of mainly soluble organic components (SOF) and hydrocarbons; (2) particulate traps (DPF) and regeneration technology thereof for filtering and removing particulate matters such as soot; (3) the nitrogen oxide purification technology mainly comprises two methods of Selective Catalytic Reduction (SCR) and nitrogen oxide storage reduction (NSR); (4) the four-effect catalytic technology for simultaneously purifying PM, HC, CO and NOx, and the post-treatment technologies are respectively catalytic treatment technologies aiming at one or more pollutants, and are one of important means for solving the problem of tail gas emission pollution of the diesel engine;
after the treatment in the centralized manner is completed, whether the gas discharged by the treated exhaust pollutants of the heavy-duty diesel vehicle meets the current national standard or not is detected, particularly when the emission of the heavy-duty diesel vehicle is detected, a plurality of exhaust pollutant detection devices, generally gas detectors, are arranged in an exhaust pipeline, and the concentration of the discharged pollutants is detected through the exhaust pollutant detection devices, but we know that an exhaust pipe has a long section, the pollutant concentration at the position of an air inlet of the exhaust pipe is the closest real data, but when the position of an air outlet of the exhaust pipe is detected, the exhaust pipe is contacted with the outside air, so that the pollutant data can be diluted to a certain degree, the dilution degree also depends on the sealing property with the exhaust pipe, particularly for some diesel vehicles with long driving time, the exhaust pipe can have the problems of aging or partial leaks, the measurement data is not accurate enough, but when the position of the gas detector is closer to the gas inlet of the exhaust pipe, the maintenance and the replacement of the gas detector are more difficult, but the gas outlet of the exhaust pipe is more convenient to arrange;
however, the gas concentration of the exhaust pollutants at the position of the exhaust pipe gas outlet is diluted, so that how to accurately detect the exhaust pollutants at the position of the exhaust pipe gas outlet of the exhaust pipe, thereby determining whether the emission of the heavy-duty diesel vehicle is in a standard; this is a problem; based on this, a solution is now provided.
Disclosure of Invention
The invention aims to provide a method for testing exhaust pollutants of a heavy-duty diesel vehicle;
the purpose of the invention can be realized by the following technical scheme:
a method for testing exhaust pollutants of a heavy-duty diesel vehicle specifically comprises the following steps:
the method comprises the following steps: setting the collected rotating speed by analyzing the rotating speed range in the modes of adopting the first exhaust collection mode and the second exhaust collection mode, eliminating redundant data in the group of data of the lowest rotating speed according to the relation between the W value and X1 under the condition that the group of data of the lowest rotating speed is calculated by the lowest rotating speed of a plurality of diesel vehicles collected twice a day in a month when the diesel vehicles run, and determining the nuclear low-speed value according to the approved lowest rotating speed;
processing the highest rotating speed in the same mode of processing the lowest rotating speed data to obtain a nuclear high-speed value, so that an acquisition rotating speed group consisting of a plurality of acquisition rotating speeds is determined;
step two: collecting exhaust gas at each acquisition rotating speed corresponding to the acquisition rotating speed group in the first exhaust gas collection mode and the second exhaust gas collection mode, and discharging the exhaust gas into a vacuum detection box;
step three: a plurality of gas detectors which are uniformly distributed are arranged in the vacuum detection box; every time when correspondingly discharged waste gas enters, gas detection is carried out, and all collected waste gas and corresponding gas concentration thereof are obtained under the two conditions of a first exhaust gas collection mode and a second exhaust gas collection mode respectively through the gas detection; the corresponding exhaust gas collection mode I and the exhaust gas collection mode II are respectively marked as a gas concentration group I and a gas concentration group II of the corresponding collected exhaust gas group; dividing the gas concentration I corresponding to all the collected waste gases by the gas concentration II to obtain a corrected value;
step four: then obtaining correction values under each acquisition rotating speed condition in all the acquisition rotating speed groups, and establishing a correction model between the acquisition rotating speeds and the correction values;
step five: then testing the collected exhaust gas discharged by the heavy diesel vehicle on a test road in motion, and arranging a gas detector at the outlet of the exhaust pipe;
step six: and then, after the gas concentration of the collected waste gas is measured at different rotating speeds of the heavy diesel vehicle, acquiring the real-time gas concentration of the corresponding real-time collected waste gas by using a binomial acquisition mode, and then acquiring the actual gas concentration corresponding to each real-time collected waste gas by using the corresponding relation between the corresponding acquisition rotating speed and the correction value in the correction model.
The invention has the beneficial effects that:
comparing two collection modes of a first exhaust collection mode and a second exhaust collection mode, and analyzing a rotating speed range according to the actual rotating speed condition of the heavy diesel vehicle in the actual transportation process to determine the collection rotating speed so as to obtain a collection rotating speed group consisting of a plurality of collection rotating speeds;
then collecting the exhaust gas at each acquisition rotating speed corresponding to the acquisition rotating speed group, and discharging the exhaust gas into a vacuum detection box; correspondingly detecting a gas concentration group I and a gas concentration group II of the collected waste gas group; dividing the gas concentration two corresponding to all the collected waste gases by the gas concentration one to obtain a correction value, thereby determining a correction model between the collection rotating speed and the correction value, wherein the correction model is closer to the actual condition and is more accurate in subsequent measurement; then, real-time measurement is carried out, and the most accurate gas concentration test value is determined according to the set position; the invention is simple, effective and easy to use.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of the testing method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention is a method for testing exhaust pollutants of a heavy-duty diesel vehicle,
as a first embodiment of the present invention, the method specifically includes the following steps:
the method comprises the following steps: the pre-test environment arrangement is carried out in a specific mode that:
s1: arranging an experimental environment, and lifting a driving wheel of the heavy-duty diesel vehicle to be overhead;
s2: then two exhaust gas collection modes are set, wherein the exhaust gas collection mode is as follows: the collecting pipeline is arranged at the air inlet of the exhaust pipe and is used for collecting exhaust gas discharged by the diesel vehicle, so that subsequent analysis is facilitated;
and a second exhaust gas collection mode: a collecting pipeline is arranged at the position of an air outlet of an exhaust pipeline of the heavy-duty diesel vehicle and is used for collecting exhaust gas;
s3: then, the exhaust waste gas collected by the first exhaust gas collection mode and the second exhaust gas collection mode is transmitted to a vacuum detection box;
only one air inlet is arranged in the vacuum detection box, and the first exhaust collection mode and the second exhaust collection mode are respectively and independently used for exhausting waste gas into the box body;
step two: the method comprises the following steps of setting acquisition rotating speed in a mode of adopting a first exhaust collection mode and a second exhaust collection mode, firstly analyzing rotating speed range, acquiring the range from the lowest rotating speed to the highest rotating speed of the heavy diesel vehicle in the normal running process, and selecting the lowest rotating speed and the highest rotating speed in a specific mode:
s01: the method comprises the following specific steps of obtaining a plurality of parts of minimum rotating speeds of any diesel vehicle when the diesel vehicle operates in a month, wherein the specific obtaining mode is as follows: counting once every half day, and automatically removing the rotating speed data when the vehicle does not move, wherein the non-movement is that the vehicle does not move; then, taking values to obtain two minimum rotating speed data every day; synchronously removing the lowest rotating speed in an idling state during value taking;
s02: marking the obtained minimum rotating speeds as Zi, i =1.. n, then automatically calculating the mean value of Zi, and marking the mean value as a low-speed mean value P;
s03: calculating the deviation value W by using a formula, wherein the specific calculation formula is as follows:
；
s04: when W exceeds X1, deleting the numerical values, specifically, sequentially selecting the corresponding Zi values in a mode that Zi-P is from large to small, deleting the Zi values after each Zi value is selected, and recalculating the deviation value W after the Zi values are deleted until the W value does not exceed X1;
s05: when the W value does not exceed X1, marking the corresponding low-speed mean value at the moment as a kernel low-speed value;
s06: then carrying out the same treatment on the highest rotating speed, and marking the obtained numerical value as a nuclear high-speed value;
s07: after obtaining a nuclear low-speed value and a nuclear high-speed value, selecting a collecting rotating speed at intervals of V1 rotating speeds after selecting the nuclear low-speed value until the collecting rotating speed is close to the nuclear high-speed value to obtain a plurality of collecting rotating speeds, and then marking the collecting rotating speeds as a collecting rotating speed group;
step three: collecting exhaust gas at each acquisition rotating speed corresponding to the acquisition rotating speed group in the first exhaust gas collection mode and the second exhaust gas collection mode, and discharging the exhaust gas into a vacuum detection box;
step four: a plurality of gas detectors which are uniformly distributed are arranged in the vacuum detection box, the arrangement mode is generally set according to the distance of the gas inlet, for example, after the vacuum detection box is arranged, one gas detector is arranged in the vacuum detection box at a specified interval according to the distance between the vacuum detection box and the position of the gas inlet, wherein the gas detector is arranged at a specified interval; a gas detector is arranged at the position of the gas inlet and below the gas inlet of the vacuum detection box at each specified interval in the vertical direction; designating corresponding values set for management personnel at intervals;
when having the corresponding exhaust waste gas to enter each time, carry out gaseous detection, at first carry out gaseous detection to the collection of exhaust collection mode one, gaseous detection concrete mode is:
SS 1: uniformly arranging gas detectors at a plurality of positions in the vacuum detection box, wherein each gas detector detects a plurality of kinds of collected exhaust gas contained in the discharged exhaust gas, and marking the collected exhaust gas as Fj, j =1.. m, which indicates that m kinds of collected exhaust gas exist, and the collected exhaust gas is generally HC, CO, NO and the like;
SS 2: then let j =1, select the corresponding collected exhaust gas F1; acquiring the gas concentration of each collected waste gas detected by a plurality of gas detectors, and marking the gas concentration as Njo, wherein j =1 and o =1.. f indicates that f gas concentrations exist and are detected by f gas detectors;
SS 3: acquiring N1o, and assigning a weight value to each N1o, wherein the assigning mode is as follows:
acquiring the distance between each gas concentration corresponding to the gas detector in N1o and the gas outlet, and marking the distance as W1o, wherein W1o and N1o are in one-to-one correspondence, and o =1.. f;
then, summing all W1o to obtain a sum value, marking the sum value as Hz, and solving all weight values Q1o of N1o by using a formula, wherein the specific calculation formula is as follows: q1o =1- (W1 o/Hz);
SS 4: and calculating the determined gas concentration E1 according to a formula, wherein the specific calculation formula is as follows:
；
SS 5: then, automatically adding one to the value of j, and repeating the steps SS2-SS5 to obtain the exact gas concentrations Ej, j =1.. m of all the collected waste gases Fj, wherein the Fj corresponds to the Ej one by one;
SS 6: obtaining a first exhaust gas collection mode and a second exhaust gas collection mode, wherein all collected exhaust gases and the corresponding gas concentrations thereof under the two conditions; the corresponding exhaust gas collection mode I and the exhaust gas collection mode II are respectively marked as a gas concentration group I and a gas concentration group II of the corresponding collected exhaust gas group;
SS 7: dividing the gas concentration I corresponding to all the collected waste gases by the gas concentration II to obtain a correction value;
step five: then obtaining a correction value corresponding to each acquisition rotating speed in all the acquisition rotating speed groups, and marking the one-to-one corresponding relation between the acquisition rotating speeds and the correction values and data as a correction model;
step six: then testing the collected exhaust gas discharged by the heavy diesel vehicle on a test road in motion, and arranging a gas detector at the gas outlet of the exhaust pipe;
step seven: then, after the gas concentration of the collected waste gas is measured at different rotating speeds of the heavy diesel vehicle, the real-time gas concentration of the corresponding real-time collected waste gas is acquired by the following method, and is corrected by means of a correction model to obtain the actual gas concentration after verification, and the specific method is as follows:
correspondingly acquiring each acquisition rotating speed in the correction model;
correspondingly detecting the real-time gas concentration of real-time collected waste gas discharged from the exhaust port of the exhaust pipe under the condition that the real-time rotating speed of the heavy diesel vehicle is consistent with the collecting rotating speed in the correction model;
then multiplying the real-time gas concentration of the real-time collected waste gas discharged in real time by a correction value which is consistent with the collecting rotating speed of the corresponding collected waste gas in the correction model to obtain the verified actual gas concentration, and marking all the gas concentrations as test values;
step eight: and (6) completing the test.
As the second embodiment of the present invention, the difference between the first and the second embodiments is that the manner of collecting the real-time gas concentration of the corresponding real-time collected exhaust gas in the seventh embodiment is as follows:
step 1: after a fixed time is set, automatically collecting once collected waste gas at each fixed time interval, testing the concentration of each gas in the collected waste gas, and synchronously acquiring the real-time rotating speed at the moment;
step 2: comparing the real-time rotating speed with the collecting rotating speed in the correction model, if the real-time rotating speed is exactly consistent with the collecting rotating speed, automatically obtaining a correction value corresponding to the real-time collected waste gas, and multiplying the measured real-time gas concentration by the correction value to obtain a test result;
step 3: otherwise, if the real-time rotating speed is inconsistent with the collecting rotating speed, automatically matching the collecting rotating speed with the minimum real-time rotating speed difference value to obtain a correction value corresponding to the real-time collected waste gas, multiplying the measured real-time gas concentration value by the correction value to obtain a verified actual gas concentration, and marking all the actual gas concentrations as test values;
while one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A method for testing exhaust pollutants of a heavy-duty diesel vehicle is characterized by comprising the following steps:
the method comprises the following steps: setting the collected rotating speed by analyzing the rotating speed range in the modes of adopting the first exhaust collection mode and the second exhaust collection mode, eliminating redundant data in the group of data of the lowest rotating speed according to the relation between the W value and X1 under the condition that the group of data of the lowest rotating speed is calculated by the lowest rotating speed of a plurality of diesel vehicles collected twice a day in a month when the diesel vehicles run, and determining the nuclear low-speed value according to the approved lowest rotating speed;
processing the highest rotating speed in the same mode of processing the lowest rotating speed data to obtain a nuclear high-speed value, so that an acquisition rotating speed group consisting of a plurality of acquisition rotating speeds is determined;
step two: collecting exhaust gas at each acquisition rotating speed corresponding to the acquisition rotating speed group in the first exhaust gas collection mode and the second exhaust gas collection mode, and discharging the exhaust gas into a vacuum detection box;
step three: a plurality of gas detectors which are uniformly distributed are arranged in the vacuum detection box; every time when correspondingly discharged waste gas enters, gas detection is carried out, and all collected waste gas and corresponding gas concentration thereof are obtained under the two conditions of a first exhaust gas collection mode and a second exhaust gas collection mode respectively through the gas detection; the corresponding exhaust gas collection mode I and the exhaust gas collection mode II are respectively marked as a gas concentration group I and a gas concentration group II of the corresponding collected exhaust gas group; dividing the gas concentration I corresponding to all the collected waste gases by the gas concentration II to obtain a corrected value;
step four: then, obtaining correction values of all the acquisition rotating speed groups under the condition of each acquisition rotating speed, and establishing a correction model between the acquisition rotating speeds and the correction values;
step five: then testing the collected exhaust gas discharged by the heavy diesel vehicle on a test road in motion, and arranging a gas detector at the outlet of the exhaust pipe;
step six: and then, after the gas concentration of the collected waste gas is measured at different rotating speeds of the heavy diesel vehicle, acquiring the real-time gas concentration of the corresponding real-time collected waste gas by using a binomial acquisition mode, and then acquiring the actual gas concentration corresponding to each real-time collected waste gas by using the corresponding relation between the corresponding acquisition rotating speed and the correction value in the correction model.
2. The method for testing exhaust pollutants of a heavy-duty diesel vehicle as claimed in claim 1, wherein the step one is preceded by the steps of:
and (4) performing pre-test environment arrangement, actively collecting exhaust waste gas by setting two exhaust collection modes, and transmitting the collected exhaust waste gas to a vacuum detection box.
3. The method for testing exhaust pollutants of a heavy-duty diesel vehicle as claimed in claim 2, wherein the pre-test environment is arranged in a manner that:
s1: arranging an experimental environment, and lifting a driving wheel of the heavy-duty diesel vehicle to be overhead;
s2: then two exhaust gas collection modes are set,
the first exhaust gas collection mode: the method comprises the following steps of arranging a collecting pipeline at the position of an air inlet of an exhaust pipe, wherein the collecting pipeline is used for collecting exhaust gas discharged by the diesel vehicle;
a second exhaust gas collection mode: a collecting pipeline is arranged at the position of an air outlet of an exhaust pipeline of the heavy diesel vehicle and is used for collecting and discharging waste gas;
s3: and then the exhaust gas collected by the first exhaust gas collection mode and the second exhaust gas collection mode is transmitted to a vacuum detection box.
4. The method for testing the exhaust pollutants of the heavy-duty diesel vehicle as claimed in claim 1, wherein the rotating speed range analysis in the step one is to obtain a range from the lowest rotating speed to the highest rotating speed of the heavy-duty diesel vehicle in the normal driving process, and the selection of the lowest rotating speed and the highest rotating speed is as follows:
s01: acquiring the lowest rotating speed of a plurality of diesel vehicles running in a month near any diesel vehicle, and excluding the lowest rotating speed in an idle state when values are taken;
s02: marking the lowest rotation speed as Zi, i =1.. n, then automatically calculating the mean value of Zi, and marking the mean value as a low-speed mean value P;
s03: calculating the deviation value W by using a formula, wherein the specific calculation formula is as follows:
s04: when W exceeds X1, deleting the numerical values, specifically, sequentially selecting the corresponding Zi values in a mode that Zi-P is from large to small, deleting the Zi values after each Zi value is selected, and recalculating the deviation value W after the Zi values are deleted until the W value does not exceed X1;
s05: when the W value does not exceed X1, marking the corresponding low-speed mean value at the moment as a kernel low-speed value;
s06: then, carrying out the same treatment on the highest rotating speed, and marking the obtained numerical value as a nuclear high-speed value;
s07: after obtaining the nuclear low-speed value and the nuclear high-speed value, selecting a collecting rotating speed at intervals of V1 rotating speeds after selecting the nuclear low-speed value until the collecting rotating speed is close to the nuclear high-speed value, obtaining a plurality of collecting rotating speeds, and then marking the collecting rotating speeds as a collecting rotating speed group.
5. The method for testing the exhaust pollutants of the heavy-duty diesel vehicle as claimed in claim 1, wherein the gas detectors in the third step are arranged according to the distance of the gas inlet, and after the vacuum detection box is arranged, one gas detector is arranged at each specified interval in the vertical direction below the gas inlet of the vacuum detection box;
only one air inlet exists in the vacuum detection box, and the designated interval is a numerical value preset by an administrator.
6. The method for testing the exhaust pollutants of the heavy-duty diesel vehicle as claimed in claim 1, wherein the gas detection in the third step is specifically as follows:
firstly, gas detection is carried out on the collection of a first exhaust collection mode, and the specific mode of the gas detection is as follows:
SS 1: uniformly arranging gas detectors at a plurality of positions in the vacuum detection box, wherein each gas detector detects a plurality of collected waste gases contained in the discharged waste gas, and marking the collected waste gases as Fj, j =1.. m, which indicates that m collected waste gases exist;
SS 2: then let j =1, select the corresponding collected exhaust gas F1; acquiring the gas concentration of each collected waste gas detected by a plurality of gas detectors, and marking the gas concentration as Njo, wherein j =1 and o =1.. f indicates that f gas concentrations exist and are detected by f gas detectors;
SS 3: acquiring N1o, and assigning a weight value to each N1o, wherein the assigning mode is as follows:
acquiring the distance between each gas concentration corresponding to the gas detector in N1o and the gas outlet, and marking the distance as W1o, wherein W1o and N1o are in one-to-one correspondence, and o =1.. f;
then, summing all W1o to obtain a sum value, marking the sum value as Hz, and solving all weight values Q1o of N1o by using a formula, wherein the specific calculation formula is as follows:
Q1o=1-（W1o/Hz）；
SS 4: and (3) calculating the determined gas concentration E1 according to a formula, wherein the specific calculation formula is as follows:
SS 5: then, automatically adding one to the value of j, and repeating the steps SS2-SS5 to obtain the determined gas concentrations Ej, j =1.. m of all the collected waste gases Fj, wherein the Fj corresponds to the Ej one by one;
SS 6: obtaining a first exhaust gas collection mode and a second exhaust gas collection mode, wherein all collected exhaust gases and corresponding gas concentrations thereof under the two conditions; the corresponding exhaust gas collection mode I and the exhaust gas collection mode II are respectively marked as a gas concentration group I and a gas concentration group II of the corresponding collected exhaust gas group;
SS 7: and dividing the gas concentration two corresponding to all the collected waste gases by the gas concentration one to obtain a correction value.
7. The method for testing the exhaust pollutants of the heavy-duty diesel vehicle as claimed in claim 1, wherein the two collection modes in the sixth step are as follows:
correspondingly acquiring each acquisition rotating speed in the correction model;
correspondingly detecting the real-time gas concentration of the discharged real-time collected waste gas under the condition that the real-time rotating speed of the heavy diesel vehicle is consistent with the collecting rotating speed in the correction model;
and then multiplying the real-time gas concentration of the real-time collected waste gas discharged in real time by a correction value corresponding to the consistency of the collection rotating speed of the collected waste gas in the correction model to obtain the verified actual gas concentration.
8. The method for testing the exhaust pollutants of the heavy-duty diesel vehicle as claimed in claim 1, wherein the two collection modes in the sixth step are as follows:
step 1: after a fixed time is set, automatically collecting once collected waste gas at each fixed time interval, testing the concentration of each gas in the collected waste gas, and synchronously obtaining the real-time rotating speed at the moment;
step 2: comparing the real-time rotating speed with the collecting rotating speed in the correction model, if the real-time rotating speed is exactly consistent with the collecting rotating speed, automatically obtaining a correction value corresponding to the real-time collected waste gas, and multiplying the measured real-time gas concentration by the correction value to obtain the verified actual gas concentration;
step 3: otherwise, if the real-time rotating speed is inconsistent with the collecting rotating speed, automatically matching the collecting rotating speed with the minimum difference value between the real-time rotating speed and the collecting rotating speed to obtain a correction value corresponding to the real-time collected waste gas, and multiplying the real-time gas concentration value obtained by measurement by the correction value to obtain the verified actual gas concentration.
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| US5639957A (en) * | 1995-10-12 | 1997-06-17 | Snap-On Technologies, Inc. | Method and apparatus for performing modal mass analysis of exhaust gas from motor vehicle |
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