CN106442341B - A kind of petrol engine lubricating oil oxidation stability measuring method based on spot test - Google Patents
A kind of petrol engine lubricating oil oxidation stability measuring method based on spot test Download PDFInfo
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- 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
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- G—PHYSICS
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Abstract
The invention belongs to engine lubricating oils to monitor field, disclose a kind of measuring method of petrol engine lubricating oil oxidation stability based on spot test, include the following steps：(1) 3 ~ 5, vehicle different distance travelled lubricating oil oil samples to be measured are taken, filter paper spot test is carried out, oil mark image is obtained by mobile phone photograph method and is transmitted to computer；(2) oil mark image is split by Matlab software, denoised, seek oil mark image grayscale mean value；(3) the scanning amount heat test of pressure differential is carried out to the lubricating oil oil sample obtained in step (1) and measures lubricating oil initial oxidation temperature value, and establish functional relationship model with obtained oil sample gray average；(4) live spot test, image procossing acquisition gray average are carried out to oil sample to be measured, gray average is brought into the functional relationship model that step (3) is established, calculates initial oxidation temperature.The method of the present invention equipment is simple and convenient to operate, measurement accuracy is high, realizes the measurement of petrol engine lubricating oil initial oxidation temperature in situ quantitation.
Description
Technical field
The present invention relates to a kind of measuring methods of petrol engine lubricating oil oxidation stability, belong to engine lubricating oil prison
Survey field.
Background technique
Lubricating oil spot test has early started in the 1950s using the peace and quiet dispersion of qualitative evaluation lubricating oil on site
Performance, this method is easy to operate, at low cost, time-consuming short, therefore uses till today always, but this method needs to have rich experiences
There are biggish errors for the result that professional identifies each provincial characteristics of oil mark, and judges.At computer picture
The development of reason technology has scholar to determine the different zones feature of oil mark instead of naked eyes identification method using image processing techniques,
Calculate different zones area and coloration, it is intended to quantitatively characterizing lubricating oil detergent-dispersant performance energy, but at present these methods also need into
One step combination field test is to verify its accuracy.
Lubricating oil oxidation stability is an important performance indexes in lubricating oil evaluation procedure, determines that lubricating oil makes
With rotten complexity, high temperature resistance and service life etc. occur in the process, therefore provide a kind of more efficient and convenient
Lubricating oil oxidation stability evaluation method is of great significance to the oil quality of monitoring lubricating oil.It is currently used to comment
The method of valence oxidation stability has rotating bomb oxidation test, and be open test tube oxidation test, pressure differential scanning calorimetry etc., these sides
Method needs Specialty Experiment personnel to operate in laboratory by expensive equipment, and there is detection time length, operating procedure complexity or oil products
The deficiencies of dosage is larger, the need for not being able to satisfy scene, immediately, efficiently easily measuring petrol engine lubricating oil oxidation stability
It asks.
Summary of the invention
It is an object of the invention to realize a kind of live, instant, efficient and convenient method to quantitative determine rising for lubricating oil
Beginning oxidizing temperature divides oil mark region in conjunction with lubrication oil filter paper spot test and Matlab image processing techniques, calculates oil mark ash
Mean value is spent to characterize the lubricating oil situation of change of different distances travelled, while carrying out pressure differential scanning calorimetry measurement starting oxygen
Change temperature, establishes spot test oil mark gray average and laboratory pressure differential scanning calorimetry measures lubricating oil initial oxidation temperature
Relational model between degree calculates initial oxidation temperature with the oil mark gray average that live spot test obtains, realizes gasoline hair
The measurement of motivation lubricating oil oxidation stability in situ quantitation.
A kind of petrol engine lubricating oil oxidation stability measuring method based on spot test of the invention is specific to walk
It is rapid as follows：
(1) 3 ~ 5, vehicle different distance travelled lubricating oil oil samples to be measured are taken, and carry out spot test, concrete operation method
It is as follows：
A. after automobile engine 1 ~ 2 h out of service, oil level gauge of engine is taken out, extracts 8 ~ 12 mL engine lubrications
Oily sample；
B. take 90 ~ 110 mm quantitative filter paper of a diameter be placed horizontally at diameter be 65 ~ 75 mm disposal plastic cups on,
Keep filter paper central area hanging, in no-wind environment, 1 ~ 3 mL suction pipe is inserted into 20 ~ 30 mm depth in candidate oil, vertically
It is proposed suction pipe, by the 5th or 6 lubrication oil droppings perpendicular to 20 ~ 30 mm drops above filter paper on filter paper, oil to be lubricated expands on filter paper
Dissipate 1 ~ 2 h；
C. oil mark image is acquired using photographing function of mobile phone, acquired image is transferred to computer；
(2) oil mark image is handled by Matlab software, seeks oil mark gray average, specific method is：
A. the colored oil mark image collected is converted to by gray level image by Matlab software, output image grayscale is straight
Fang Tu, and determine image different zones segmentation threshold, image is split using Global thresholding, with the output of two-value bitmap-format
Image after segmentation, verification segmentation obtain the size and shape in region, Optimized Segmentation threshold value；
B. present image area is solved by STATS=regionprops (BW, ' area') function, using BW=
Bwareaopen (BW, area) function removes the isolated noise that cut zone external area is less than threshold value area, to bianry image
It is negated, carries out BW=bwareaopen (BW, 5000) again and remove noise of the cut zone internal area less than 5000, so
Image is negated again afterwards, obtains the cut zone for removing all noises；
C. the binary map after denoising is converted into grayscale image, the oil mark grayscale image after being divided and being denoised calculates oil mark
Gray average, according to blank filter paper gray average and spot test filter paper blank position gray average, to calculating resulting oil
Spot gray average is modified, and reduces brought error of taking pictures；
(3) pressure differential scanning amount heat test measurement lubricating oil starting is carried out to the lubricating oil oil sample obtained in step (1)
Oxidizing temperature value, and functional relationship model is established with obtained oil sample gray average；
(4) it takes the lubricating oil oil sample of initial oxidation temperature to be measured to carry out live spot test by step (1), passes through step
(2) method carries out image segmentation and calculates to obtain the mileage oil mark gray average, and obtained gray average is brought into and is established
It is calculated in functional relationship model, obtains the initial oxidation temperature value of the mileage.
The beneficial effects of the present invention are：
(1) a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test of the invention only needs to survey
The initial oxidation temperature value of fixed 3 ~ 5 mileage travelled lubricating oil oil samples is in conjunction with oil mark gray average corresponding in spot test
Numerical relationship model between the two can be established, realizes the measurement of lubricating oil initial oxidation temperature, the oxygen of quantitatively characterizing lubricating oil
Change stability, measurement accuracy is high.
(2) a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test of the invention, test
Equipment is simple, easy to operate, few with oil mass, at low cost, with the wireless transmission method of photographing function of mobile phone combined data, realizes
The remote transmission and storage of data.
(3) a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test of the invention,
It completes image segmentation, denoising and gray average in Matlab software to solve, processing speed is fast, and precision is high.
Detailed description of the invention
Fig. 1 is oil mark image processing process figure of the present invention, wherein (a) is oil mark gray level image, it (b) is oil mark intensity histogram
Figure (c) is oil mark filter paper white space grayscale image, is (e) noise figure outside removal oil mark, (f) (d) to there is noise segmentation figure
For removal oil mark inside noise figure, deposition ring figure (g) is obtained for segmentation, (h) obtains diffuser ring figure for segmentation, (i) is to divide
To oil ring figure；
Fig. 2 is the variety classes lubricating oil initial oxidation temperature prediction data of the invention provided by embodiment and experiment number
According to comparison diagram, wherein (a) is full synthetic oil, (b) it is semi synthetic base oils -1, (c) is semi synthetic base oils -2, (d) be mineral oil.
Specific embodiment
For the present invention is further explained to reach the technical means and efficacy that predetermined goal of the invention is taken, below in conjunction with attached
Figure and application example, to a kind of petrol engine lubricating oil oxidation stability survey based on spot test proposed according to the present invention
The specific embodiment and working principle for determining method are described in detail.Following embodiment is only used for being illustrated more clearly that the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Embodiment 1：
Road performance test is carried out to a kind of commercially available fully synthetic lubricating oil, to operation 0 km, 1084 km, 1305 km, 1923 km
And 2348 km 5 mileage lubricating oil it is separately sampled, illustrate embodiment of the present invention by taking wherein 1084 km oil samples as an example,
After engine 1 ~ 2 h out of service, oil rule is taken out, 8 ~ 12 mL lubricating oil is extracted and is placed in 15 mL centrifuge tubes, by capacity
For 1 ~ 3 mL suction pipe be inserted into apart from lubricating oil liquid level be at 20 ~ 30 mm acquisition oil sample, vertically above mention, by the 5th or 6 drop moisten
For lubricating oil drop on the quantitative filter paper that diameter is 90 ~ 110 mm, quantitative filter paper is placed in the disposal plastic cup that diameter is 65 ~ 75 mm
On rim of a cup, keep filter paper center hanging, after oil to be lubricated spreads 1 ~ 2 h on filter paper, mobile phone is placed on tripod, level meter is used
Keep mobile phone camera horizontal, adjustment tripod establishing shot height is 50 ~ 100 mm, shoots oil mark image and transmits photo
Onto computer；Original color image I is converted into such as figure by the colored oil mark image of shooting by J=rgb2gray (I) function
Gray level image shown in 1 (a), label 1 show oil ring region, and label 2 show diffusion ring region, and label 3 show deposition
Ring region, shown in grey level histogram such as Fig. 1 (b) of output gray level oil mark image, according to trough position shown in label 4 in Fig. 1 (b)
It sets corresponding gray value and determines that segmentation threshold is respectively 50,151,182,194, by cut zone with the output of two-value bitmap-format, and
Segmented image size and shape is verified, segmentation threshold is optimized, segmentation obtains shown in diffusion ring region such as Fig. 1 (d), and 1 (d)
It is middle to there is the isolated noise indicated such as label 5,6, it is found out currently by STATS=regionprops (BW, ' area') function
White area area area, and using the area as noise-removed threshold value, using the removal point of BW=bwareaopen (BW, area) function
Cut the isolated noise that region exterior is less than area area, after denoising shown in result such as Fig. 1 (e), to image 1 (e) by function BW=
~ BW carries out inversion operation, then is removed inside cut zone by function BW=bwareaopen (BW, 5000) such as 1 (e) icon
Isolated noise of the pixel less than 5000 shown in numbers 7, then again negates image, obtains removing the cut zone of all noises such as
Shown in Fig. 1 (f), deposition ring, diffuser ring and the oil ring obtained after being split according to the method is respectively such as Fig. 1 (g), 1 (h), 1
(i) shown in, the binary map after denoising is subjected to the oil mark after product obtains segmentation denoising with original gradation figure homography element
Grayscale image, the initial gray mean value for calculating oil mark is Hchushi, blank filter paper gray average H is calculated according to the methodblankAnd spot
Test filter paper blank position gray average H as shown in Fig. 1 (c)background, repaired to resulting oil mark gray average is calculated
Just, Havg=(Hblank-Hbackground)+Hchushi, to reduce mobile phone photograph bring error, and according to the method in remaining 4
Journey oil sample carries out gray average measurement；
Pressure differential scanning amount heat is carried out to 0 km, 1084 km, 1305 km, 1923 km and 2348 km mileage oil samples to survey
Examination, sets 10 K/min of heating rate, and 3.5 MPa of pressure measures initial oxidation temperature value；Test vehicle distance travelled is established to exist
The functional relationship model of 5 different mileage oil sample gray averages and initial oxidation temperature during 0 ~ 2348 km, such as Fig. 2 (a) institute
Show, the linear relation model of gray average and initial oxidation temperature is y=0.68x+130.73, and wherein x is gray average, and y is
Beginning oxidizing temperature, goodness of fit Adj. R2=0.96, model credibility is high；
According to the method to 3 mileage oil samples of 2750 km of unknown initial oxidation temperature, 2962 km and 3503 km
It being measured, after taking out oil sample according to the method, carries out spot test, mobile phone photograph, image procossing obtains oil mark gray average,
It brings into established relational model, calculates initial oxidation temperature value, obtained initial oxidation temperature calculated value such as table 1
Shown, with experiment value error between -0.62 ~ 1.2 DEG C, it is high that this method measures initial oxidation temperature precision.
Embodiment 2：
Two kinds of commercially available semi synthetic base oils are tested according to the method, take -1 distance travelled 0 ~ 1258 of semi synthetic base oils respectively
4 oil samples measure according to the method between 0 ~ 3219 km of 5 lubricating oil oil samples between km and -2 distance travelled of semi synthetic base oils
Beginning oxidizing temperature value and gray average；The relational model established between gray average and initial oxidation temperature is respectively y=0.83x+
108.71 and y=1.24x+37.45, wherein x is gray average, and y is initial oxidation temperature, respectively as shown in Fig. 2 (b) and 2 (c),
Its Adj. R2Respectively 0.99 and 0.91, model it is with a high credibility；According to the method to the profit of subsequent unknown initial oxidation temperature
Lubricating oil oil sample is measured, and after taking out oil sample according to the method, carries out spot test, mobile phone photograph, image procossing obtains oil mark
Gray average is brought into established relational model, and initial oxidation temperature value is calculated, obtained initial oxidation temperature theory meter
For calculation value as shown in table 2 and table 3, -1 calculated value of semi synthetic base oils and experiment value error are semi-synthetic between -0.37 ~ 0.77 DEG C
Between -0.43 ~ 0.26 DEG C, it is high that this method measures initial oxidation temperature precision for oily -2 calculated values and experiment value error.
Embodiment 3：
A kind of commercial mineral lubricating oil is tested according to the method, to 4 of distance travelled between 0 ~ 2056 km
Oil sample measures initial oxidation temperature and gray average according to the method；Gray average, which is established, with initial oxidation temperature relational model is
Y=1.67x-39.89, wherein x is gray average, and y is initial oxidation temperature, as shown in Fig. 2 (d), models fitting goodness Adj.
R2=0.95, model credibility is high；3 mileage oil samples of subsequent unknown initial oxidation temperature are measured according to the method, are pressed
After the method takes out oil sample, spot test, mobile phone photograph are carried out, image procossing obtains oil mark gray average, brings into and established
Relational model in, calculate initial oxidation temperature value, obtained initial oxidation temperature calculated value is as shown in table 4, mineral
Oily theoretical value and the error range of experiment value are -4.52 ~ 2.1 DEG C, and this method measurement accuracy is high.
A kind of petrol engine lubricating oil oxidation stability measuring method based on spot test provided by the invention is first
Oil mark gray average, cooperation experiment chamber pressure are obtained by the spot test combination Matlab image procossing of 3 ~ 5 candidate oils
Power differential scanning calorimetry measures corresponding oil sample initial oxidation temperature, establishes relational model between the two, then passes through scene
Spot test obtains gray average, and it is fixed to the scene of unknown initial oxidation temperature lubricating oil to realize in conjunction with the relational model established
It is fixed to measure.The present invention is simple and convenient, at low cost, measurement result is accurate and reliable.
1 full synthetic oil initial oxidation temperature calculated value of table and experiment value
- 1 initial oxidation temperature calculated value of 2 semi synthetic base oils of table and experiment value
- 2 initial oxidation temperature calculated value of 3 semi synthetic base oils of table and experiment value
4 mineral oil initial oxidation temperature calculated value of table and experiment value
。
Claims (6)
1. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test, characterized in that including following
Step：
(1) 3 ~ 5, vehicle different distance travelled lubricating oil oil samples to be measured are taken, and carry out spot test, the specific operation method is as follows：
A. after automobile engine 1 ~ 2 h out of service, oil level gauge of engine is taken out, extracts the examination of 8 ~ 12 mL engine lubricating oils
Sample；
B. taking 90 ~ 110 mm quantitative filter paper of a diameter to be placed horizontally at diameter is to make to filter on 65 ~ 75 mm disposal plastic cups
Paper central area is hanging, and in no-wind environment, 1 ~ 3 mL suction pipe is inserted into 20 ~ 30 mm depth in candidate oil, vertical to propose
Suction pipe, by the 5th or 6 lubrication oil droppings perpendicular to 20 ~ 30 mm drops above filter paper on filter paper, oil to be lubricated spreads 1 ~ 2 on filter paper
h；
C. oil mark image is acquired using photographing function of mobile phone, acquired image is transferred to computer；
(2) oil mark image is handled by Matlab software, seeks oil mark gray average, specific method is：
A. the colored oil mark image collected is converted to by gray level image by Matlab software, exports image grayscale histogram
Figure, and determine image different zones segmentation threshold, image is split using Global thresholding, with the output point of two-value bitmap-format
Image after cutting, verification segmentation obtain the size and shape in region, Optimized Segmentation threshold value；
B. present image area is solved by STATS=regionprops (BW, ' area') function, using BW=bwareaopen
(BW, area) function removes the isolated noise that cut zone external area is less than threshold value area, negates to bianry image,
BW=bwareaopen (BW, 5000) is carried out again removes noise of the cut zone internal area less than 5000, it is then right again
Image negates, and obtains the cut zone for removing all noises；
C. the binary map after denoising is converted into grayscale image, the oil mark grayscale image after being divided and being denoised calculates the ash of oil mark
Mean value is spent, it is grey to resulting oil mark is calculated according to blank filter paper gray average and spot test filter paper blank position gray average
Degree mean value is modified, and reduces brought error of taking pictures；
(3) the scanning amount heat test of pressure differential is carried out to the lubricating oil oil sample obtained in step (1) and measures lubricating oil initial oxidation
Temperature value, and functional relationship model is established with obtained oil sample gray average；
(4) it takes the lubricating oil oil sample of initial oxidation temperature to be measured to carry out live spot test by step (1), passes through step (2) side
Method carries out image segmentation and calculates to obtain the mileage oil mark gray average, brings obtained gray average into established function and closes
It is to be calculated in model, obtains the initial oxidation temperature value of the mileage.
2. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test according to claim 1,
It is characterized in that using the fixed mobile phone of tripod level, to obtain intuitive accurately oil mark image, vertical shooting is high in step (1)
Degree is 50 ~ 100 mm.
3. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test according to claim 1,
It is characterized in that in step (2), present image area is solved by STATS=regionprops (BW, ' area') function, and with
The area area is noise-removed threshold value, removes to obtain segmentation binary map China and foreign countries using BW=bwareaopen (BW, area) function
Portion's area be less than threshold value area isolated noise, to after denoising binary map carry out inversion operation, using BW=bwareaopen (BW,
5000) the isolated noise inside function removal image less than 5000, again negates image, point after obtaining denoising completely
Cut binary map.
4. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test according to claim 1,
It is characterized in that passing through the gray average of blank filter paper and the gray average of spot test oil mark filter paper white space in step (2)
The sum of the oil mark gray average that is calculated again with Matlab of difference gray average is modified, reduce what mobile phone photograph generated
Error.
5. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test according to claim 1,
It is characterized in that according to the initial oxidation temperature of 3 ~ 5 different mileage oil samples and corresponding gray average, establishing it in step (3)
Functional relationship model.
6. a kind of petrol engine lubricating oil oxidation stability measuring method based on spot test according to claim 1,
It is characterized in that the gray average of initial oxidation temperature oil sample to be measured is brought into established functional relationship model in step (4),
Initial oxidation temperature value is calculated.
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| CN108625926A (en) * | 2017-03-21 | 2018-10-09 | 北京爱德盛业科技有限公司 | A method of Lubricant of Automobile Engine is detected based on mobile intelligent terminal |
| CN109001414A (en) * | 2018-06-05 | 2018-12-14 | 中铝东南材料院（福建）科技有限公司 | A kind of oil mark semi-quantitative detection method of Aluminum Strip Rolling oil |
| CN115855840B (en) * | 2023-02-23 | 2023-05-12 | 山东天力润滑油有限公司 | Engine oil detection method and device |
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