CN106442341A - Method for testing oxidation stability of gasoline engine lubricating oil based on spot test - Google Patents
Method for testing oxidation stability of gasoline engine lubricating oil based on spot test Download PDFInfo
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- CN106442341A CN106442341A CN201610830382.XA CN201610830382A CN106442341A CN 106442341 A CN106442341 A CN 106442341A CN 201610830382 A CN201610830382 A CN 201610830382A CN 106442341 A CN106442341 A CN 106442341A
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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
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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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention belongs to the monitoring field of engine lubricating oil, and discloses a method for testing the oxidation stability of gasoline engine lubricating oil based on a spot test. The method comprises the following steps: (1) obtaining lubricating oil samples of three to five different running mileage of a to-be-tested vehicle, conducting a filter paper spot test, obtaining an oil spot image through photographing by a mobile phone and then transmitting the oil spot image to a computer; (2) conducting segmentation and denoising on the oil spot image by Matlab software, calculating a gray scale average value of the oil spot image; (3) conducting pressure differential type scanning calorimeter tests on the obtained lubricating oil samples to determine lubricating oil initial oxidation temperature value, and establishing a functional relationship model by the lubricating oil initial oxidation temperature value and the obtained oil sample gray scale average value; (4) conducting on-site spot tests and picture processing on the to-be-tested oil samples to obtain the gray scale average value, putting the gray scale average value in the functional relationship model established in step 3, and calculating the initial oxidation temperature value. According to the method, equipment is simple, operation is convenient, measurement accuracy is high, and the on-site quantitative measurement of initial oxidation temperature of the gasoline engine lubricating oil is achieved.
Description
Technical field
The present invention relates to a kind of assay method of petrol engine lubricating oil oxidation stability, belong to engine lubricating oil prison
Survey field.
Background technology
Lubricating oil spot test had started to be applied to the peace and quiet dispersion of live qualitative evaluation lubricating oil early in the 1950's
Performance, the method is simple to operate, low cost, takes short, therefore uses till today always, but the method needs there is rich experiences
To oil mark, each provincial characteristics is identified professional, and the result judging has larger error.At computer picture
The development of reason technology, has scholar to replace naked eyes RM to judge the zones of different feature of oil mark using image processing techniques,
Calculate zones of different area and colourity it is intended to quantitatively characterizing lubricating oil detergent-dispersant performance energy, but at present these methods also need to into
One step is with reference to field test to verify its accuracy.
Lubricating oil oxidation stability is important performance indexes in lubricating oil evaluation procedure, and determining lubricating oil makes
With during there is rotten complexity, resistance to elevated temperatures and service life etc., therefore provide one kind more efficiently easily
Lubricating oil oxidation stability evaluation method has highly important meaning to the oil quality of monitoring lubricating oil.That commonly uses at present comments
The method of valency oxidation stability has rotating bomb oxidation test, opening test tube oxidation test, pressure differential scanning calorimetry etc., these sides
Method needs Specialty Experiment personnel to operate by expensive equipment in laboratory, there is detection time length, operating procedure complexity or oil product
Large usage quantity etc. is not enough it is impossible to meet scene, need that are instant, efficiently easily measuring petrol engine lubricating oil oxidation stability
Ask.
Content of the invention
It is an object of the invention to realizing a kind of live, instant, efficient easily method to quantitative determine rising of lubricating oil
Beginning oxidizing temperature, in conjunction with lubrication oil filter paper spot test and Matlab image processing techniques segmentation oil mark region, calculates oil mark ash
Degree average, to characterize the lubricating oil situation of change of different distances travelled, carries out pressure differential scanning calorimetry simultaneously and measures initial oxygen
Change temperature, set up spot test oil mark gray average and measure lubricating oil initial oxidation temperature with laboratory pressure differential scanning calorimetry
Relational model between degree, calculates initial oxidation temperature with the oil mark gray average that live spot test obtains, realizes gasoline and send out
Motivation lubricating oil oxidation stability in situ quantitation measures.
A kind of petrol engine lubricating oil oxidation stability assay method based on spot test of the present invention, it specifically walks
Suddenly as follows：
(1) take 3 ~ 5 different distance travelled lubricating oil oil samples of vehicle to be measured, and carry out spot test, concrete operation method is as follows：
A. after automobile engine 1 ~ 2 h out of service, take out oil level gauge of engine, extract 8 ~ 12 mL engine lubricating oil examinations
Sample；
B. take a diameter 90 ~ 110 mm quantitative filter paper to be placed horizontally on a diameter of 65 ~ 75 mm disposal plastic cups, make filter
Paper central area is hanging, in no-wind environment, 1 ~ 3 mL suction pipe is inserted 20 ~ 30 mm depth in candidate oil, vertical proposition
Suction pipe, by the 5th or 6 lubrication oil droppings, above filter paper, 20 ~ 30 mm drip on filter paper, and oil to be lubricated spreads 1 ~ 2 on filter paper
h；
C. gather oil mark image using photographing function of mobile phone, by the image transmitting collecting to computer；
(2) by Matlab software, oil mark image is processed, ask for oil mark gray average, concrete grammar is：
A. the colored oil mark image collecting is converted to by gray level image, output image intensity histogram by Matlab software
Figure, and determine image zones of different segmentation threshold, using Global thresholding, image is split, with the output point of two-value bitmap-format
Image after cutting, verification segmentation obtains the size and shape in region, Optimized Segmentation threshold value；
B. pass through STATS=regionprops (BW, ' area') function and solve present image area, using BW=bwareaopen
(BW, area) function removes the isolated noise that cut zone external area is less than threshold value area, and bianry image is negated,
Carry out BW=bwareaopen (BW, 5000) again and remove the noise that cut zone internal area is less than 5000, then right again
Image negates, and obtains removing the cut zone of all noises；
C. the binary map after denoising is converted to gray-scale map, obtains splitting and the oil mark gray-scale map after denoising, calculate the ash of oil mark
Degree average, according to blank filter paper gray average and spot test filter paper blank position gray average, to the oil mark ash calculating gained
Degree average is modified, and reduces brought error of taking pictures；
(3) pressure differential scanning amount heat test is carried out to the lubricating oil oil sample obtaining in step (1) and measure lubricating oil initial oxidation
Temperature value, and set up functional relationship model with obtained oil sample gray average；
(4) carry out live spot test by the lubricating oil oil sample that step (1) takes initial oxidation temperature to be measured, by step (2) side
Method carries out image segmentation and calculates this mileage oil mark gray average of acquisition, the gray average obtaining is brought into set up function and closes
It is to be calculated in model, obtain the initial oxidation temperature value of this mileage.
The beneficial effects of the present invention is：
(1) present invention a kind of only need to measure 3 based on the petrol engine lubricating oil oxidation stability assay method of spot test ~
The initial oxidation temperature value of 5 distance travelled lubricating oil oil samples, can build in conjunction with oil mark gray average corresponding in spot test
Vertical numerical relationship model between the two, realizes the mensure of lubricating oil initial oxidation temperature, and quantitatively characterizing oil ageing is pacified
Qualitative, certainty of measurement is high.
(2) a kind of petrol engine lubricating oil oxidation stability assay method based on spot test of the present invention, test
Equipment is simple, easy to operate, low cost few with oil mass, with photographing function of mobile phone combine data wireless transmission method it is achieved that
The long-distance transmissions of data and storage.
(3) a kind of petrol engine lubricating oil oxidation stability assay method based on spot test of the present invention,
Complete image segmentation, denoising and gray average in Matlab software to solve, processing speed is fast, high precision.
Brief description
Fig. 1 is oil mark image processing process figure of the present invention, and wherein (a) is oil mark gray level image, and (b) is oil mark intensity histogram
Figure, (c) is oil mark filter paper white space gray-scale map, and (d) is to have noise segmentation figure, and (e) is to remove the outside noise figure of oil mark, (f)
For removing the internal noise figure of oil mark, (g) obtains deposition ring figure for segmentation, and (h) obtains diffuser ring figure for segmentation, and (i) is to split
To oil ring figure；
The variety classes lubricating oil initial oxidation temperature prediction data that Fig. 2 is provided by embodiment for the present invention and experimental data pair
Ratio figure, wherein (a) are full synthetic oil, and (b) is semi synthetic base oils -1, and (c) is semi synthetic base oils -2, and (d) is mineral oil.
Specific embodiment
It is to reach technological means and effect that predetermined goal of the invention is taken for the present invention is expanded on further, below in conjunction with attached
Figure and application example, survey to according to a kind of petrol engine lubricating oil oxidation stability based on spot test proposed by the present invention
Determine the specific embodiment of method and operation principle is described in detail.Following examples are only used for being illustrated more clearly that the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Embodiment 1：
Road performance test is carried out to the commercially available fully synthetic lubricating oil of one kind, to run 0 km, 1084 km, 1305 km, 1923 km and
5 mileage lubricating oil of 2348 km are separately sampled, illustrate embodiment of the present invention taking wherein 1084 km oil samples as a example, treat
After engine stop runs 1 ~ 2 h, take out oil rule, extract 8 ~ 12 mL lubricating oil and be placed in 15 mL centrifuge tubes, capacity is 1
The suction pipe of ~ 3 mL is inserted into and gathers oil sample at lubricating oil liquid level about 20 ~ 30 mm, vertically above carries, the 5th or 6 is lubricated
On the diameter about quantitative filter paper of 90 ~ 110 mm, quantitative filter paper is placed in the disposal plastic cup of a diameter of 65 ~ 75 mm to oil droplet
On rim of a cup, make filter paper center hanging, after oil to be lubricated spreads 1 ~ 2 h on filter paper, mobile phone is placed on tripod, uses level meter
Keep mobile phone camera level, adjustment tripod establishing shot is highly about 50 ~ 100 mm, shoots oil mark image and pass photo
Defeated on computer；By shoot colored oil mark image by J=rgb2gray (I) function by original color image I be converted into as
Gray level image shown in Fig. 1 (a), label 1 show oil ring region, and label 2 show diffusion ring region, and it is heavy that label 3 show
Long-pending ring region, shown in grey level histogram such as Fig. 1 (b) of output gray level oil mark image, the trough according to label in Fig. 1 (b) 4
The corresponding gray value in position determines that segmentation threshold is respectively 50,151,182,194, and cut zone is exported with two-value bitmap-format,
And verify segmentation figure as size and shape, segmentation threshold is optimized, segmentation obtains spreading shown in ring region such as Fig. 1 (d), 1
There is the isolated noise being indicated as label 5,6 in (d), function is obtained ought by STATS=regionprops (BW, ' area')
Front white portion area area, and with described area as noise-removed threshold value, removed using BW=bwareaopen (BW, area) function
Isolated noise less than area area outside cut zone, after denoising shown in result such as Fig. 1 (e), passes through function to image 1 (e)
BW=~ BW carries out inversion operation, then removes internal such as 1 (e) figure of cut zone by function BW=bwareaopen (BW, 5000)
The isolated noise that pixel shown in label 7 is less than 5000, then negates to image again, obtains removing the cut zone of all noises
As shown in Fig. 1 (f), the deposition ring, diffuser ring and the oil ring that obtain after being split according to the method respectively as Fig. 1 (g), 1 (h), 1
Shown in (i), the binary map after denoising and original gradation figure homography element are carried out product and obtains splitting the oil mark after denoising
Gray-scale map, the initial gray average calculating oil mark is Hchushi, calculate blank filter paper gray average H according to the methodblankAnd spot
Test filter paper blank position gray average H as shown in Fig. 1 (c)background, the oil mark gray average calculating gained is repaiied
Just, Havg=(Hblank-Hbackground)+Hchushi, to reduce the error that mobile phone photograph brings, and according to the method in remaining 4
Journey oil sample carries out gray average mensure；
Pressure differential scanning amount Thermal test is carried out to 0 km, 1084 km, 1305 km, 1923 km and 2348 km mileage oil samples,
Set programming rate 10 K/min, pressure 3.5 MPa, record initial oxidation temperature value；Set up test vehicle distance travelled 0 ~
5 during 2348 km different mileage oil sample gray averages and the functional relationship model of initial oxidation temperature, as Fig. 2 (a) institute
Show, gray average is y=0.68x+130.73 with the linear relation model of initial oxidation temperature, 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 3 mileage oil samples of 2750 km of unknown initial oxidation temperature, 2962 km and 3503 km are carried out
Measure, after taking out oil sample according to the method, carry out spot test, mobile phone photograph, image procossing obtains oil mark gray average, brings into
In the relational model set up, calculate initial oxidation temperature value, the initial oxidation temperature calculated value obtaining such as table 1 institute
Show, and experiment value error is between -0.62 ~ 1.2 DEG C, the method measures initial oxidation temperature high precision.
Embodiment 2：
Two kinds of commercially available semi synthetic base oils are tested according to the method, take respectively semi synthetic base oils -1 distance travelled 0 ~ 1258 km it
Between 5 lubricating oil oil samples and semi synthetic base oils -2 distance travelled 0 ~ 3219 km between 4 oil samples measure initial oxygen according to the method
Change temperature value and gray average；The relational model set up between gray average and initial oxidation temperature is respectively y=0.83x+
108.71 and y=1.24x+37.45, wherein x are gray average, and y is initial oxidation temperature, respectively as shown in Fig. 2 (b) and 2 (c),
Its Adj. R2Be respectively 0.99 and 0.91, model with a high credibility；Profit to subsequently unknown initial oxidation temperature according to the method
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, brings in set up relational model, calculates initial oxidation temperature value, the theoretical meter of the initial oxidation temperature obtaining
, as shown in table 2 and table 3, semi synthetic base oils -1 calculated value and experiment value error are between -0.37 ~ 0.77 DEG C, semi-synthetic for calculation value
, between -0.43 ~ 0.26 DEG C, the method measures initial oxidation temperature high 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 oil samples between 0 ~ 2056 km for the distance travelled
Measure initial oxidation temperature and gray average according to the method；Setting up gray average with initial oxidation temperature relational model is y=
1.67x-39.89, wherein x are gray average, and y is initial oxidation temperature, such as shown in Fig. 2 (d), models fitting goodness Adj. R2=
0.95, model credibility is high；According to the method 3 mileage oil samples of subsequently unknown initial oxidation temperature are measured, by institute
After method of stating takes out oil sample, carry out spot test, mobile phone photograph, image procossing obtains oil mark gray average, brings into and is set up
In relational model, calculate initial oxidation temperature value, the initial oxidation temperature calculated value obtaining is as shown in table 4, mineral oil
Theoretical value is -4.52 ~ 2.1 DEG C with the error range of experiment value, and the method certainty of measurement is high.
A kind of petrol engine lubricating oil oxidation stability assay method based on spot test that the present invention provides is first
Matlab image procossing is combined by the spot test of 3 ~ 5 candidate oils and obtains oil mark gray average, cooperation experiment chamber pressure
Power differential scanning calorimetry measures corresponding oil sample initial oxidation temperature, sets up relational model therebetween, subsequently passes through scene
Spot test obtains gray average, realizes the scene to unknown initial oxidation temperature lubricating oil in conjunction with the relational model set up fixed
It is fixed to measure.The present invention is simple and convenient, low cost, measurement result accurately and reliably.
Table 1 full synthetic oil initial oxidation temperature calculated value and experiment value
Table 2 semi synthetic base oils -1 initial oxidation temperature calculated value and experiment value
Table 3 semi synthetic base oils -2 initial oxidation temperature calculated value and experiment value
Table 4 mineral oil initial oxidation temperature calculated value and experiment value
Claims (6)
1. a kind of petrol engine lubricating oil oxidation stability assay method based on spot test, is characterized in that, including following
Step：
(1) take 3 ~ 5 different distance travelled lubricating oil oil samples of vehicle to be measured, and carry out spot test, concrete operation method is as follows：
A. after automobile engine 1 ~ 2 h out of service, take out oil level gauge of engine, extract 8 ~ 12 mL engine lubricating oil examinations
Sample；
B. take a diameter 90 ~ 110 mm quantitative filter paper to be placed horizontally on a diameter of 65 ~ 75 mm disposal plastic cups, make filter
Paper central area is hanging, in no-wind environment, 1 ~ 3 mL suction pipe is inserted 20 ~ 30 mm depth in candidate oil, vertical proposition
Suction pipe, by the 5th or 6 lubrication oil droppings, above filter paper, 20 ~ 30 mm drip on filter paper, and oil to be lubricated spreads 1 ~ 2 on filter paper
h；
C. gather oil mark image using photographing function of mobile phone, by the image transmitting collecting to computer；
(2) by Matlab software, oil mark image is processed, ask for oil mark gray average, concrete grammar is：
A. the colored oil mark image collecting is converted to by gray level image, output image intensity histogram by Matlab software
Figure, and determine image zones of different segmentation threshold, using Global thresholding, image is split, with the output point of two-value bitmap-format
Image after cutting, verification segmentation obtains the size and shape in region, Optimized Segmentation threshold value；
B. pass through STATS=regionprops (BW, ' area') function and solve present image area, using BW=bwareaopen
(BW, area) function removes the isolated noise that cut zone external area is less than threshold value area, and bianry image is negated,
Carry out BW=bwareaopen (BW, 5000) again and remove the noise that cut zone internal area is less than 5000, then right again
Image negates, and obtains removing the cut zone of all noises；
C. the binary map after denoising is converted to gray-scale map, obtains splitting and the oil mark gray-scale map after denoising, calculate the ash of oil mark
Degree average, according to blank filter paper gray average and spot test filter paper blank position gray average, to the oil mark ash calculating gained
Degree average is modified, and reduces brought error of taking pictures；
(3) pressure differential scanning amount heat test is carried out to the lubricating oil oil sample obtaining in step (1) and measure lubricating oil initial oxidation
Temperature value, and set up functional relationship model with obtained oil sample gray average；
(4) carry out live spot test by the lubricating oil oil sample that step (1) takes initial oxidation temperature to be measured, by step (2) side
Method carries out image segmentation and calculates this mileage oil mark gray average of acquisition, the gray average obtaining is brought into set up function and closes
It is to be calculated in model, obtain the initial oxidation temperature value of this mileage.
2. a kind of petrol engine lubricating oil oxidation stability assay method based on spot test according to claim 1,
It is characterized in that, in step (1), mobile phone is fixed using tripod level, to obtain intuitively accurately oil mark image, vertical shooting is high
Degree is about 50 ~ 100mm.
3. a kind of petrol engine lubricating oil oxidation stability assay 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
Described area area is noise-removed threshold value, is removed using BW=bwareaopen (BW, area) function and obtains splitting binary map China and foreign countries
Portion's area be less than threshold value area isolated noise, inversion operation is carried out to binary map after denoising, using BW=bwareaopen (BW,
5000) function removes the isolated noise inside image less than 5000, again image is negated, and obtains dividing after complete denoising
Cut binary map.
4. a kind of petrol engine lubricating oil oxidation stability assay method based on spot test according to claim 1,
It is characterized in that, in step (2), by the gray average of the gray average of blank filter paper and spot test oil mark filter paper white space
Difference with Matlab calculated oil mark gray average sum, gray average is modified again, reduce mobile phone photograph produce
Error.
5. a kind of petrol engine lubricating oil oxidation stability assay method based on spot test according to claim 1,
It is characterized in that, in step (3), the initial oxidation temperature according to 3 ~ 5 different mileage oil samples and corresponding gray average, set up it
Functional relationship model.
6. a kind of petrol engine lubricating oil oxidation stability assay method based on spot test according to claim 1,
It is characterized in that, in step (4), the gray average of initial oxidation temperature oil sample to be measured is brought into set up functional relationship model,
It is calculated initial oxidation temperature value.
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| CN115855840A (en) * | 2023-02-23 | 2023-03-28 | 山东天力润滑油有限公司 | Engine oil detection method and device |
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