CN109060695A - The method of calibration of exhaust gas from diesel vehicle testing result accuracy - Google Patents
The method of calibration of exhaust gas from diesel vehicle testing result accuracy Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 100
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000010521 absorption reaction Methods 0.000 claims abstract description 97
- 238000007689 inspection Methods 0.000 claims abstract description 46
- 239000000779 smoke Substances 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000000691 measurement method Methods 0.000 claims abstract description 7
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- 238000011105 stabilization Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000008030 elimination Effects 0.000 claims description 3
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- 239000002283 diesel fuel Substances 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
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- G01N2201/12746—Calibration values determination
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Abstract
The present invention relates to a kind of methods of calibration of exhaust gas from diesel vehicle testing result accuracy comprising: it is measured using opacity smoke meter to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle；It is synchronous to be measured using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness value；It calculates in exhaust gas from diesel vehicle discharge process, absorption coefficient of light y per second and lingemann blackness value x；It converts to lingemann blackness value x, is converted into the lingemann blackness scaled value y ' that there are same units with absorption coefficient of light y；The lingemann blackness scaled value y ' of synchronization is compared with absorption coefficient of light y, if meeting preset condition, warning note；If being unsatisfactory for preset condition, not warning note.The lingemann blackness value and the absorption coefficient of light of tail gas are compared by method of the invention, avoid and occur mistake or cheating in exhaust gas from diesel vehicle absorption coefficient of light detection process, and improve the accuracy of detection efficiency and result.
Description
Technical field
The present invention relates to exhaust gas from diesel vehicle detection fields, and in particular to a kind of school of exhaust gas from diesel vehicle testing result accuracy
Proved recipe method.
Background technique
Currently, whether exhaust gas from diesel vehicle discharge is qualified, main use freely accelerates smoke opacity method and Lug-Down not
Light transmission smoke intensity method measures the absorption coefficient of light of tail gas, then judges the absorption coefficient of light of exhaust gas from diesel vehicle in measurement process
Whether over-limit condition, if over-limit condition, the exhaust gas from diesel vehicle discharge it is unqualified；If being not above limiting value, the bavin
Oily tail gas discharge is qualified.When using the measurement of Lug-Down smoke opacity method, the limiting value of the absorption coefficient of light is 1.39；
When using freely accelerating smoke opacity method to measure, the limiting value of the absorption coefficient of light is 3.In measurement process, it is easy to appear
Mistake or cheating, and mainly realized by way of manually verifying in the judgment process, subjectivity is strong, heavy workload,
The accuracy of detection data can not be effectively ensured in low efficiency.
Summary of the invention
In view of this, it is really necessary to provide a kind of method of calibration of exhaust gas from diesel vehicle testing result accuracy, this method is logical
The lingemann blackness value and the absorption coefficient of light for crossing detection exhaust gas from diesel vehicle, the two numerical value is compared, the diesel oil tailstock is avoided
Occur mistake or cheating in gas absorption coefficient of light detection process, while improving the accurate of detection efficiency and testing result
Property.
The method of calibration of the exhaust gas from diesel vehicle testing result accuracy of offer of the invention, comprising:
S101 is measured to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle using opacity smoke meter, is recorded per second
The absorption coefficient of light；It is synchronous to be measured using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness value；
S102 is calculated in exhaust gas from diesel vehicle discharge process, lingemann blackness value x per second；
S103 converts to lingemann blackness value x, is converted into the woods for having same units with absorption coefficient of light y
The graceful blackness scaled value y ' of lattice；
The lingemann blackness scaled value y ' of synchronization is compared by S104 with absorption coefficient of light y, if meeting default item
Part, then warning note；If being unsatisfactory for preset condition, not warning note.
Further, the method also includes:
Before S101, first in the exhaust pipe by the sampling probe insertion of opacity smoke meter by inspection diesel vehicle；And acquire woods
Stabilization image before the graceful blackness value of lattice measures in 10-30S by inspection diesel vehicle middle and back is as background image.
Further, described to convert to lingemann blackness value x in S103, it is converted into and is had with absorption coefficient of light y
There is the lingemann blackness scaled value y ' of same units, specifically:
Using formula: y '=x3/6-x2/ 3+2x/3 converts to lingemann blackness value x, is converted into and light absorption
Coefficient y has the lingemann blackness scaled value y ' of same units.
Further, the absorption coefficient of light, which uses, freely accelerates smoke opacity method to measure.
Further, in S104, the lingemann blackness scaled value y ' by synchronization compares with absorption coefficient of light y
Compared with, if meeting preset condition, warning note；If being unsatisfactory for preset condition, not warning note, specifically:
Using freely accelerate smoke opacity method measure the absorption coefficient of light when, when lingemann blackness value be more than or equal to 2.8 grades,
Then the lingemann blackness value scaled value of synchronization is compared with the absorption coefficient of light, if continuous N seconds or accumulative M seconds Ringelman
Blackness value is more than or equal to 2.8 grades, but the absorption coefficient of light is less than 3 or display is qualified；Then warning note；On the contrary then not warning note.
Further, described freely to accelerate smoke opacity method specifically: opacity smoke meter to be opened, by smoke opacity
In exhaust pipe of the sampling probe insertion of meter by inspection diesel vehicle；Make to be under idling mode by inspection diesel vehicle, rapidly steps on throttle
On earth, so that injection pump is supplied maximum oil mass in the shortest time and keep this position before engine reaches the maximum (top) speed of permission
It sets, when engine reaches maximum (top) speed, release throttle restores engine to idling, repeats at least 3 times；Record detection process
In the absorption coefficient of light absorption coefficient of light per second.
Further, the absorption coefficient of light, which uses, freely accelerates smoke opacity method to measure.
Further, in S104, the lingemann blackness scaled value y ' by synchronization compares with absorption coefficient of light y
Compared with, if meeting preset condition, warning note；If being unsatisfactory for preset condition, not warning note, specifically:
Using Lug-Down smoke opacity method measure the absorption coefficient of light when, when lingemann blackness value be more than or equal to 2 grades, then
The lingemann blackness value scaled value of synchronization is compared with the absorption coefficient of light, if continuous N seconds or accumulative M seconds Ringelman it is black
Angle value is more than or equal to 2 grades, but the absorption coefficient of light is less than 1.39 or display is qualified；Then warning note；On the contrary then not warning note.
Further, the Lug-Down smoke opacity method specifically:
Determine rotary drum linear velocity VelMaxHP when the maximum wheel power by inspection diesel vehicle；
The emission of vehicle under 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP speed is measured respectively
The absorption coefficient of light；
Each second under 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP speed light absorption system is recorded respectively
Number, and calculate separately the absorption coefficient of light average value y under three speed1, y2, y3If y1, y2, y3Any one is more than or equal to
1.39, then it is unqualified by inspection emission of diesel engine tail gas.
Further, the lingemann blackness value is measured using following methods:
S11 acquires background image, specifically, by the stabilization image of inspection diesel vehicle middle and back in 10-30S before acquisition measures
As background image；
S12 carries out denoising to background image using the method for low-pass filtering, removes the interference letter in background image
Breath；
S13, for image when acquiring emission of diesel engine tail gas as image is measured, the measurement image includes diesel vehicle profile
And the tail gas ontology of emission of diesel engine；
S14 protrudes the diesel vehicle profile and tail gas ontology in measurement image, weakening or elimination and bavin using Robust Estimation method
The information that oily wheel is wide and tail gas ontology is unrelated；
S15, removal measure part identical with background image in image, obtain tail gas image, which includes bavin
Oily wheel exterior feature and tail gas ontology；
S16 removes the diesel vehicle profile in tail gas image, obtains tail gas ontology；
S17 determines the lingemann blackness of tail gas ontology: according to the tail gas ontology, the gray scale for calculating tail gas ontology is average
Value, average gray is compared with Ringelman map parameter, obtains the lingemann blackness grade of tail gas ontology.
Compared with prior art, the method for calibration of exhaust gas from diesel vehicle testing result accuracy of the invention, by detecting bavin
The lingemann blackness value and the absorption coefficient of light of oily tail gas, the two numerical value is compared, and avoids exhaust gas from diesel vehicle light absorption
Occur mistake or cheating in coefficient detection process, while improving the accuracy of detection efficiency and testing result.
Detailed description of the invention
Fig. 1 is the flow diagram that method of the present invention uses exhaust gas from diesel vehicle lingemann blackness method；
The flow diagram of the method for calibration of the exhaust gas from diesel vehicle testing result accuracy of Fig. 2 one embodiment of the invention；
The flow diagram of the method for calibration of the exhaust gas from diesel vehicle testing result accuracy of Fig. 3 further embodiment of this invention；
The flow diagram of the method for calibration of the exhaust gas from diesel vehicle testing result accuracy of Fig. 4 yet another embodiment of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
Example, present invention is further described in detail.It should be appreciated that described herein, specific examples are only used to explain the present invention,
It is not intended to limit the present invention.
The present invention is using the lingemann blackness of exhaust gas from diesel vehicle to the accurate of exhaust gas from diesel vehicle absorption coefficient of light testing result
Property is verified.
As shown in Figure 1, exhaust gas from diesel vehicle lingemann blackness of the present invention measures by the following method:
S11 acquires background image, specifically, by the stabilization image of inspection diesel vehicle middle and back in 10-30S before acquisition measures
As background image.The background image is only the image of road surface and ambient enviroment, does not include diesel vehicle.Due to the face of background
The interference such as color, texture, shade trembling all directly affect the accuracy of exhaust gas from diesel vehicle lingemann blackness measurement, and therefore, acquisition is surveyed
Stabilization image before measuring in 10-30S by inspection diesel vehicle middle and back can reduce background to bavin as background image to greatest extent
The influence of oily tail gas lingemann blackness measurement.When choosing measurement place, chooses shade and trembles less place, it is possible to reduce
Influence of the background to exhaust gas from diesel vehicle lingemann blackness.
S12 removes the interference information in background image.Specifically, background image is carried out using the method for low-pass filtering
Denoising.Since the spectrum concentration of picture signal is in high frequency, by the way that the interference in background image can be eliminated after denoising
Factor makes to measure diesel vehicle profile and tail gas ontology in image and more protrudes, easily distinguishes.
S13, for image when acquiring emission of diesel engine tail gas as image is measured, the measurement image includes diesel vehicle profile
And the tail gas ontology of emission of diesel engine.
S14 protrudes the diesel vehicle profile and tail gas ontology in measurement image, weakening or elimination and bavin using Robust Estimation method
The information that oily wheel is wide and tail gas ontology is unrelated achievees the purpose that the entirety or local feature of emphasizing measurement image.
S15, removal measure part identical with background image in image, obtain tail gas image, which includes bavin
Oily wheel exterior feature and tail gas ontology.
S16 removes the diesel vehicle profile in tail gas image, obtains tail gas ontology.It specifically includes, confirms diesel vehicle profile:
The video image of acquisition is detected frame by frame, and is matched with the car modal in database, is extracted and is transported using calculus of finite differences
Animal body, to confirm diesel vehicle profile.Confirmation tail gas ontology: removal diesel vehicle profile utilizes light by multiple image comparisons
Stream method extracts the range that tail gas drifts in video image, and the changes in distribution of the gray value according to light stream in different images becomes
Gesture obtains the direction of drifting of tail gas according to the variation of gray value, and the concentration of tail gas is determined according to the size of gray value, really
Determine tail gas ontology.
S17 determines the lingemann blackness of tail gas ontology: according to the tail gas ontology, the gray scale for calculating tail gas ontology is average
Value, average gray is compared with Ringelman map parameter, obtains the lingemann blackness grade of tail gas ontology.
The refinement of lingemann blackness value is as shown in table 1:
Table 1: lingemann blackness value and intensity contrast table
Of the invention freely accelerates smoke opacity method to measure using following methods:
Before measurement, it will be first under idling mode by inspection diesel vehicle, throttle is floored rapidly, makes injection pump most in short-term
The maximum oil mass of interior supply keeps this position before engine reaches the maximum (top) speed of permission, turns when engine reaches maximum
Speed unclamps throttle, restores engine to idling, and repetitive operation 3 times；In this way can will by inspection exhausting pipe of diesel oil vehicle residual it is dirty
Object emptying is contaminated, the accuracy of measurement is improved.
Then, opacity smoke meter is opened, by the sampling probe insertion of opacity smoke meter by the exhaust pipe of inspection diesel vehicle
It is interior, in the idling state, it will be floored by inspection diesel vehicle throttle rapidly, injection pump is made to supply maximum oil mass in the shortest time,
Before engine reaches the maximum (top) speed of permission, this position is kept, when engine reaches maximum (top) speed, release throttle makes to start
Machine restores to idling, and repetitive operation at least 3 times；Record process data (each second light in entire measurement process entirely measured
Absorption coefficient).After acquisition is stepped on the gas every time, at least 5 seconds process datas after engine peed stable, i.e., at least 5 seconds light is inhaled
Coefficient data is received, the average absorption coefficient of light (y as the secondary measurement is taken1', y2', y2')；At least 3 times average value is taken again
The final absorption coefficient of light averagely as this by inspection diesel vehicle, i.e. final detection result.In the present embodiment, described by inspection diesel oil
In vehicle measurement process, vehicle remains static.Entire detection process at least steps on throttle three times, the time of recording process data
Preferably 2min.
In order to reduce error, guarantee the accurate fixed of measurement result, at least duplicate measurements three times (in i.e. each measurement process,
Above-mentioned movement is at least repeated, throttle three times is stepped on), by least the average value of the measurement process absorption coefficient of light is averaging again three times
Value, the final detection result of the absorption coefficient of light as the tail gas by inspection diesel engine truck exhaust, and sentenced with the final detection result
Break the emission of diesel engine tail gas it is whether qualified.If the absorption coefficient of light of final detection result is more than or equal to 3, the diesel oil is proved
The tail gas of vehicle discharge is unqualified, which is unqualified vehicle.
Lug-Down smoke opacity method of the invention is measured using following methods:
It drives by inspection diesel vehicle to chassis dynamometer, driving wheel is placed in rotary drum central location, lifting is fallen, slowly drives
Vehicle makes the wheel by inspection diesel vehicle fit like a glove with experimental drum, by the insertion of opacity smoke meter sampling probe by inspection diesel vehicle
In exhaust pipe, suitable gear is selected, makes gas pedal in maximum position, the max. speed by inspection diesel vehicle is closest
70km/h, gas pedal standard-sized sheet after engine peed stable, apply dynamics by detection industrial control software and carry out power scan, determine
Vehicle maximum wheel power, and rotary drum linear velocity when scanning obtained maximum wheel power is denoted as true VelMaxHP
(that is, rotary drum linear velocity when surveying maximum wheel power), obtain continue to scan on after true VelMaxHP it is low to rotary drum linear velocity
After 80%VelMaxHP, rotary drum linear velocity is restored to 100%VelMaxHP, 90%VelMaxHP, 80% respectively
VelMaxHP measures the discharge of (i.e. 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP) vehicle under friction speed
The absorption coefficient of light of tail gas.After detection starts, each second absorption coefficient of light (being commonly called as process data) will be recorded, calculated separately
Under tri- speed of 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP, the absorption coefficient of light of this measurement process
Average value, such as y1, y2, y3, and the absorption coefficient of light average value under three speed (is used into Lug-Down not with standard limitation
Light transmission smoke intensity method measures, 1.39) absorption coefficient of light of qualified vehicle, which should be lower than, to be compared, if measured under three speed
Absorption coefficient of light y1, y2, y31.39 are below, then it is qualified by inspection emission of diesel engine tail gas to prove, if y1, y2, y3Any one is big
It is in being equal to 1.39, then unqualified by inspection emission of diesel engine tail gas.In the present embodiment, in measurement process, vehicle is in simulation row
Make state, the optimal measuring time under each speed is 2 minutes to 30 seconds 2 minutes.
As shown in Fig. 2, the method for calibration packet for the exhaust gas from diesel vehicle testing result accuracy that first embodiment of the invention provides
It includes:
S101 is measured to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle using opacity smoke meter, is recorded per second
The absorption coefficient of light；It is synchronous to be measured using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness；
Further, before carrying out absorption coefficient of light measurement, first by the sampling probe insertion of opacity smoke meter by inspection bavin
In the exhaust pipe of oily vehicle.The stabilization image before lingemann blackness value measures in 10-30S by inspection diesel vehicle middle and back is acquired as back
Scape image.
Wherein, the described pair of absorption coefficient of light and lingemann blackness value by inspection exhaust gas from diesel vehicle measures, and can be pair
Under diesel vehicle simulated driving state or stationary state, the tail gas absorption coefficient of light and lingemann blackness value in a period of time respectively into
The continuous measurement of row.In the present embodiment, smoke opacity method is accelerated to measure the absorption coefficient of light according to load, then diesel vehicle is in
Simulated driving state, time of measuring preferably 2 minutes to 30 seconds 2 minutes；It is inhaled according to freely accelerating smoke opacity hair to measure light
Receive coefficient, then diesel vehicle remains static, and time of measuring preferably 2 minutes.Certainly, time of measuring is not limited to of the present invention
Time range, the specific time can be adjusted according to the actual situation.
Wherein, when using opacity smoke meter to being measured by the inspection exhaust gas from diesel vehicle progress absorption coefficient of light, including but
It is not limited to use and freely accelerates smoke opacity method or Lug-Down smoke opacity method.Specific detection method as previously mentioned, this
Place repeats no more.
Wherein, it is measured using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness；Specifically adopt
Exhaust gas from diesel vehicle lingemann blackness is detected with above-mentioned lingemann blackness method, details are not described herein again.
S102 is calculated in exhaust gas from diesel vehicle discharge process, lingemann blackness value x per second；
When measuring the lingemann blackness value at a certain moment, since tail gas has certain volume, its gray value of different location
Difference, so choosing the tail gas average gray as lingemann blackness value.
S103 converts to lingemann blackness value x, is converted into the woods for having same units with absorption coefficient of light y
The graceful blackness scaled value y ' of lattice；
Specifically, by following formula, the lingemann blackness value x measured is converted into having with absorption coefficient of light y identical
The lingemann blackness scaled value y ' of unit.Specific formula is as follows:
Y '=x3/6-x2/ 3+2x/3 is wherein: y ' is lingemann blackness scaled value, and x is lingemann blackness value.
The lingemann blackness scaled value y ' of synchronization is compared by S104 with absorption coefficient of light y, if meeting default item
Part, then warning note；If being unsatisfactory for preset condition, not warning note.
In a preferred embodiment, the absorption coefficient of light is measured according to Lug-Down smoke opacity method, then preset condition
Are as follows: when tail gas lingemann blackness value is more than or equal to 2 grades, then by the lingemann blackness value scaled value and the absorption coefficient of light of synchronization
It is compared, if continuous N second or accumulative M second lingemann blackness value are more than or equal to 2 grades, but the absorption coefficient of light shows qualification.Wherein M
> N, M, N is natural number, in the embodiment of the present invention, M=5 seconds, N=3 seconds.In the present embodiment, impermeable using acceleration-deceleration
When light smoke intensity method measures the absorption coefficient of light, when the absorption coefficient of light is more than 1.39, then it represents that exhaust gas from diesel vehicle discharge is unqualified.
If lingemann blackness value shows exceeded, but the absorption coefficient of light but shows qualification, then it represents that detection process may quality problems, example
It such as plays tricks, instrument goes wrong.
In a further preferred embodiment, according to freely accelerating smoke opacity method to measure the absorption coefficient of light, then item is preset
Part are as follows: tail gas lingemann blackness value is more than or equal to 2.8 grades, then carries out the lingemann blackness value and the absorption coefficient of light of synchronization
Compare, if continuous N second or accumulative M second lingemann blackness value are more than or equal to 2.8 grades, but the absorption coefficient of light shows qualification.Wherein M >
N, M, N are natural number, and in the embodiment of the present invention, M=5 seconds, N=3 seconds, in other embodiments, M, N was also possible to other
Numerical value.When in the present embodiment, using adding by the acceleration smoke opacity method measurement absorption coefficient of light, when the absorption coefficient of light is more than 3
When, then it represents that exhaust gas from diesel vehicle discharge is unqualified.
The method of calibration of exhaust gas from diesel vehicle testing result accuracy of the invention, by the Ringelman for detecting exhaust gas from diesel vehicle
The two numerical value is compared by blackness value and the absorption coefficient of light, avoids in exhaust gas from diesel vehicle absorption coefficient of light detection process
Existing mistake or cheating, while improving the accuracy of detection efficiency and testing result.
As shown in figure 3, the method for calibration packet for the exhaust gas from diesel vehicle testing result accuracy that second embodiment of the invention provides
It includes:
S201 is remembered using freely accelerating smoke opacity method to measure to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle
Record the absorption coefficient of light per second；It is synchronous to be surveyed using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness
Amount.
Specific as described in the first embodiment of the present invention, details are not described herein again.
S202 is calculated in exhaust gas from diesel vehicle discharge process, lingemann blackness value x per second.
S203 converts to lingemann blackness value x, is converted into the woods for having same units with absorption coefficient of light y
The graceful blackness scaled value y ' of lattice；Reduction formula are as follows: y '=x3/6-x2/ 3+2x/3 is wherein: y ' is lingemann blackness scaled value, and x is woods
The graceful blackness value of lattice.
The lingemann blackness scaled value y ' of synchronization is compared by S204 with absorption coefficient of light y, if the tail gas measured
Lingemann blackness value is more than or equal to 2.8 grades, then is compared the lingemann blackness value and the absorption coefficient of light of synchronization；If even
Continue 3 seconds or accumulative 5 seconds lingemann blackness values are more than or equal to 2.8 grades, but absorption coefficient of light display is qualified.Wherein M > N, M, N are certainly
So number, in the embodiment of the present invention, M=5 seconds, N=3 seconds, then carries out warning note；Conversely, then not warning note.
As shown in figure 4, the method for calibration packet for the exhaust gas from diesel vehicle testing result accuracy that third embodiment of the invention provides
It includes:
S301 is measured to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle using Lug-Down smoke opacity method, is remembered
Record the absorption coefficient of light per second；It is synchronous to be surveyed using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness
Amount.
Specific as described in the first embodiment of the present invention, details are not described herein again.
S302 is calculated in exhaust gas from diesel vehicle discharge process, lingemann blackness value x per second.
S303 converts to lingemann blackness value x, is converted into the woods for having same units with absorption coefficient of light y
The graceful blackness scaled value y ' of lattice；Reduction formula are as follows: y '=x3/6-x2/ 3+2x/3 is wherein: y ' is lingemann blackness scaled value, and x is woods
The graceful blackness value of lattice.
The lingemann blackness scaled value y ' of synchronization is compared by S304 with absorption coefficient of light y, if the tail gas measured
Lingemann blackness value is more than or equal to 2 grades, then is compared the lingemann blackness value and the absorption coefficient of light of synchronization；If continuous
3 seconds or accumulative 5 seconds lingemann blackness values are more than or equal to 2 grades, but absorption coefficient of light display is qualified.Wherein M > N, M, N are natural number,
In with the embodiment of the present invention, M=5 seconds, N=3 seconds, then warning note is carried out；Conversely, then not warning note.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of method of calibration of exhaust gas from diesel vehicle testing result accuracy characterized by comprising
S101 is measured to by the absorption coefficient of light of inspection exhaust gas from diesel vehicle using opacity smoke meter, is recorded light per second and inhale
Receive coefficient；It is synchronous to be measured using lingemann blackness measurement method to by inspection exhaust gas from diesel vehicle lingemann blackness value；
S102 is calculated in exhaust gas from diesel vehicle discharge process, lingemann blackness value x per second；
S103 converts to lingemann blackness value x, is converted into the Ringelman for having same units with absorption coefficient of light y
Blackness scaled value y '；
The lingemann blackness scaled value y ' of synchronization is compared by S104 with absorption coefficient of light y, if meeting preset condition,
Then warning note；If being unsatisfactory for preset condition, not warning note.
2. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 1, which is characterized in that the side
Method further include:
Before S101, first in the exhaust pipe by the sampling probe insertion of opacity smoke meter by inspection diesel vehicle；And acquire Ringelman
Stabilization image before blackness value measures in 10-30S by inspection diesel vehicle middle and back is as background image.
3. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 2, which is characterized in that S103
In, described to convert to lingemann blackness value x, be converted into has the Ringelman of same units black with absorption coefficient of light y
Scaled value y ' is spent, specifically:
Using formula: y '=x3/6-x2/ 3+2x/3 converts to lingemann blackness value x, is converted into and the absorption coefficient of light
Y has the lingemann blackness scaled value y ' of same units.
4. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 1-3, feature exist
In the absorption coefficient of light, which uses, freely accelerates smoke opacity method to measure.
5. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 4, which is characterized in that S104
In, it is described to be compared the lingemann blackness scaled value y ' of synchronization with absorption coefficient of light y, if meeting preset condition,
Warning note；If being unsatisfactory for preset condition, not warning note, specifically:
Using freely accelerate smoke opacity method measure the absorption coefficient of light when, when lingemann blackness value be more than or equal to 2.8 grades, then will
The lingemann blackness value scaled value of synchronization is compared with the absorption coefficient of light, if continuous N seconds or accumulative M seconds lingemann blackness
Value is more than or equal to 2.8 grades, but the absorption coefficient of light is less than 3 or display is qualified；Then warning note；On the contrary then not warning note.
6. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 5, which is characterized in that it is described from
By acceleration smoke opacity method specifically: opacity smoke meter is opened, by the sampling probe insertion of opacity smoke meter by inspection bavin
In the exhaust pipe of oily vehicle；Make to be under idling mode by inspection diesel vehicle, throttle is floored rapidly, makes injection pump in the shortest time
The maximum oil mass of interior supply keeps this position before engine reaches the maximum (top) speed of permission, when engine reaches maximum (top) speed,
Throttle is unclamped, restores engine to idling, repeats at least 3 times；Record the absorption coefficient of light per second in detection process.
7. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 1-3, feature exist
In the absorption coefficient of light, which uses, freely accelerates smoke opacity method to measure.
8. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 7, which is characterized in that S104
In, it is described to be compared the lingemann blackness scaled value y ' of synchronization with absorption coefficient of light y, if meeting preset condition,
Warning note；If being unsatisfactory for preset condition, not warning note, specifically:
Using Lug-Down smoke opacity method measure the absorption coefficient of light when, when lingemann blackness value be more than or equal to 2 grades, then will be same
The lingemann blackness value scaled value at one moment is compared with the absorption coefficient of light, if continuous N seconds or accumulative M seconds lingemann blackness value
More than or equal to 2 grades, but the absorption coefficient of light is less than 1.39 or display is qualified；Then warning note；On the contrary then not warning note.
9. the method for calibration of exhaust gas from diesel vehicle testing result accuracy according to claim 8, which is characterized in that described to add
Carry deceleration smoke opacity method specifically:
Determine rotary drum linear velocity VelMaxHP when the maximum wheel power by inspection diesel vehicle；
The light for measuring the emission of vehicle under 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP speed respectively is inhaled
Receive coefficient；
Each second under 100%VelMaxHP, 90%VelMaxHP, 80%VelMaxHP speed absorption coefficient of light is recorded respectively,
And calculate separately the absorption coefficient of light average value y under three speed1, y2, y3If y1, y2, y3Any one is more than or equal to 1.39,
It is then unqualified by inspection emission of diesel engine tail gas.
10. the method for calibration of -3,5,6,8,9 described in any item exhaust gas from diesel vehicle testing result accuracys according to claim 1,
It is characterized in that, the lingemann blackness value is measured using following methods:
S11 acquires background image, specifically, by the stabilization image conduct of inspection diesel vehicle middle and back in 10-30S before acquisition measures
Background image；
S12 carries out denoising to background image using the method for low-pass filtering, removes the interference information in background image；
S13, for image when acquiring emission of diesel engine tail gas as image is measured, the measurement image includes diesel vehicle profile and bavin
The tail gas ontology of oily vehicle discharge；
S14 protrudes the diesel vehicle profile and tail gas ontology in measurement image, weakening or elimination and diesel vehicle using Robust Estimation method
Profile and the unrelated information of tail gas ontology；
S15, removal measure part identical with background image in image, obtain tail gas image, which includes diesel vehicle
Profile and tail gas ontology；
S16 removes the diesel vehicle profile in tail gas image, obtains tail gas ontology；
S17 determines the lingemann blackness of tail gas ontology: according to the tail gas ontology, the average gray of tail gas ontology is calculated, it will
Average gray is compared with Ringelman map parameter, obtains the lingemann blackness grade of tail gas ontology.
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