CN111207928B - Engine oil emulsification and engine oil dilution comprehensive verification method - Google Patents
Engine oil emulsification and engine oil dilution comprehensive verification method Download PDFInfo
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- CN111207928B CN111207928B CN202010104135.8A CN202010104135A CN111207928B CN 111207928 B CN111207928 B CN 111207928B CN 202010104135 A CN202010104135 A CN 202010104135A CN 111207928 B CN111207928 B CN 111207928B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention discloses a comprehensive verification test method for engine oil emulsification and engine oil dilution, which is characterized in that before a new vehicle leaves a factory and is delivered to a user, circulation steps of starting, accelerating, idling and restarting at a lower environmental temperature are adopted, and the engine oil emulsification condition and the engine oil dilution condition are judged according to an engine oil emulsification judgment standard and an engine oil dilution judgment standard, so that whether the risk of engine oil emulsification and engine oil dilution exists in a vehicle engine can be fully verified, the vehicle with the risk of engine oil emulsification or engine oil dilution is prevented from flowing into the market, and the after-sale maintenance or recall cost is saved.
Description
Technical Field
The invention relates to a low-temperature environment test of a whole vehicle, in particular to a comprehensive verification test method for engine oil emulsification and engine oil dilution.
Background
Emulsifying machine oil: in the compression stroke and the expansion stroke of the engine, the pressure of the mixed gas in the cylinder is high, and part of the mixed gas can enter a crankcase through a piston, a piston ring, a gap between the opening of the piston ring and a cylinder sleeve and the like and is mixed with the engine oil in the crankcase to form oil mist. Usually, the oil mist is led into an oil-gas separation system through a channel integrated in a cylinder body, a cylinder cover and a crankcase to separate oil, water, vapor and the like; if the oil and gas are not separated from the water vapor sufficiently, a mixture of the two will accumulate at locations such as the head cover, forming a white foam (occasionally a yellowish color).
The emulsification phenomenon of the engine is generally related to the structure of a crankcase ventilation system, the quality of engine oil, the climate condition of a vehicle driving area, the driving condition of the vehicle and the like. The occurrence of the emulsification condition may cause a reduction in the lubricating properties of the engine oil, which in turn may lead to a reduction in fuel economy and power efficiency, a reduction in engine reliability and life, and the like.
Machine oil dilution: part of fuel oil sprayed by an engine fuel spray nozzle is attached to the inner wall of an engine cylinder and enters an oil pan along with a piston ring to be mixed with engine oil; part of the mixture in the combustion chamber of the engine enters the crankcase through gaps among the piston, the piston ring and the inner wall of the cylinder, and part of the mixture is mixed with the engine oil, so that the dilution condition of the engine oil is finally generated.
The dilution phenomenon of the engine oil is generally related to the arrangement position of an oil injector, the injection angle of the oil injector, related oil injection parameters, the climate condition of a vehicle driving area, the vehicle driving condition and the like. The engine oil dilution can reduce the service life of the engine oil, reduce the fuel economy and the dynamic property, reduce the reliability and the service life of the engine, and the like.
The long-time tracking investigation and data analysis of the running condition of the vehicle with the conditions of engine oil emulsification and engine oil dilution find that the insufficient engine warming caused by low environmental temperature, short single running distance, low running speed, stop and go in the running process and the like is an important reason for the generation of the engine oil emulsification and the engine oil dilution.
CN107192813B discloses a method for verifying engine oil emulsification, which comprises the steps of starting, accelerating, idling, and restarting a circulation before a new vehicle leaves a factory and delivers to a user, and observing whether the engine oil turns milky white and foams to determine whether the engine oil is emulsified or not, so as to prevent the engine oil from getting into the bud, thereby eliminating the use risk of the user after the vehicle is on the market, and saving the maintenance after-sale cost caused by the engine oil emulsification. The verification test method only verifies the engine oil emulsification condition, has no special requirement on the environment temperature, verifies the working condition parameters, is only suitable for verifying the engine oil emulsification condition, and cannot judge the engine oil dilution condition.
Disclosure of Invention
The invention aims to provide a comprehensive verification test method for engine oil emulsification and engine oil dilution, which can fully verify whether the risk of engine oil emulsification and engine oil dilution exists in a vehicle engine, avoid vehicles with the risk of engine oil emulsification or engine oil dilution from entering the market, and save after-sale maintenance or recall cost.
The invention relates to a comprehensive verification test method for engine oil emulsification and engine oil dilution, which comprises the following steps:
firstly, preparing a test sample vehicle, driving the test sample vehicle at the speed of 40 +/-2 km/h for 15 +/-1 min under the condition that the environmental temperature is-35 to-15 ℃, then placing the test sample vehicle in a natural environment for cooling, and cooling engine oil and cooling liquid in an engine to the environmental temperature;
step two, verifying the working condition:
1) starting the test sample car, idling in situ for 120 plus or minus 5s if the ambient temperature is more than or equal to-25 ℃ and less than-25 ℃ if the ambient temperature is more than or equal to-35 ℃, and idling in situ for 300 plus or minus 10 s;
2) starting to accelerate to 15 +/-2 km/h, driving at a constant speed for 10 +/-2 s, and then stopping and idling in situ for 20 +/-2 s;
3) starting to accelerate to 30 +/-2 km/h, driving at a constant speed for 30 +/-2 s, and then stopping and idling in situ for 20 +/-2 s;
4) starting to accelerate to 50 +/-2 km/h, driving at a constant speed for 20 +/-2 s, and then stopping and idling in situ for 10 +/-2 s;
5) repeating the steps 2), 3) and 4) for four times, stopping the vehicle, extinguishing the vehicle, standing and cooling for more than 4 hours, and measuring the liquid level height of the engine oil;
step three, stopping and extinguishing after the working condition is verified for 5 times by repeating the step two, disassembling an engine oil port cover, an oil rule and a cylinder cover of the engine and checking the engine oil emulsification condition; after the inspection is finished, the test sample car is restored to the original state, is kept stand and cooled for more than 4 hours, and the liquid level height of the engine oil is measured;
step four, repeating the step two to verify the working condition for 30 times, stopping and extinguishing the engine, disassembling an engine oil cover, an oil rule and a cylinder cover of the engine, and checking the engine oil emulsification condition; after the inspection is finished, the test sample car is restored to the original state, the test sample car is kept stand and cooled for more than 8 hours, the oil level height is measured, then 200mL of engine oil in an engine oil pan is collected, the engine oil dilution rate is detected, and if the engine oil dilution rate is more than 10%, the engine oil dilution is judged to occur;
checking the emulsification condition, confirming according to an engine oil emulsification judgment standard, judging that the engine oil is emulsified if the engine oil emulsification judgment standard is not met, and continuing the test if the engine oil emulsification judgment standard is not met;
and step two, step three and step four are carried out after the oil level height is measured, the oil is confirmed according to an oil dilution judgment standard, if the oil level height does not meet the judgment standard, the test is stopped, the oil is judged to be diluted, and if the oil level height meets the requirement, the test is continued.
Further, the oil emulsification condition examination items in the third step and the fourth step include:
oil filling port cover: whether white foam is attached to the inner surface of the oil filling port cover and the amount of the white foam;
an oil level gauge: drawing out the oil level gauge, and observing whether the engine oil attached to the bottom of the oil level gauge becomes turbid or not;
a cylinder head cover: whether white foam is attached to the inner surface of the cylinder head cover and the amount of the white foam;
an antifreeze kettle: and observing whether the antifreeze in the antifreeze kettle becomes turbid or not.
Further, the engine oil emulsification determination standard is as follows: through the verification working condition of the second step, when the following conditions occur, the engine oil is judged to have an emulsification condition, and the use requirement of a user cannot be met:
a. more than 50% of the area of the inner surface of the oil filling port cover is adhered with obvious white foam;
b. obviously turbid engine oil is adhered to the bottom of the oil rule, and the engine oil is milky;
c. more than 50% of the area of the inner surface of the cylinder head cover is adhered with obvious white foam;
d. the antifreeze in the antifreeze kettle is in a whitish state and is turbid.
The engine oil dilution determination standard is as follows: through the verification working condition of the second step, when the following conditions occur, it is judged that the engine oil is diluted, and the use requirements of users cannot be met:
e. in the 1 st to 29 th circulation, the height of the oil level relative to the initial liquid level rises by more than 10 mm;
f. in the 30 th circulation, the height of the liquid level of the engine oil rises by more than 7mm relative to the height of the initial liquid level;
g. and step four, the engine oil dilution rate is more than 10%.
Further, if the engine oil dilution rate in the fourth step is greater than 10%, performing a reverse working condition, stopping and flameout the test sample vehicle after the test sample vehicle runs for 1 hour at the speed of 60 +/-2 km/h, standing and cooling for more than 4 hours, collecting 200mL of engine oil in an oil pan of the engine, checking the engine oil dilution rate, judging that the reverse working condition improves the engine oil dilution if the engine oil dilution rate after the reverse working condition meets the engine oil dilution judgment standard, and otherwise, judging that the reverse working condition cannot improve the engine oil dilution.
Further, the number of the test sample vehicles is at least two.
Further, when the working condition is verified in the second step, if the environmental temperature is lower than-35 ℃, the test is suspended, and when the environmental temperature is recovered to-35 ℃ or higher, the test is recovered.
Further, when the test sample car in the second step, the third step and the fourth step is kept standing and cooled, if the environmental temperature is higher than 0 ℃, the verification working condition is stopped.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention effectively simulates the running condition that the vehicle has short single running distance and low running speed in a low-temperature environment and is stopped or stopped during running by limiting and verifying the working condition parameters, and can fully verify whether the engine of the vehicle has the risks of engine oil emulsification and engine oil dilution by combining the engine oil emulsification judgment standard and the engine oil dilution judgment standard. Whether the risk of engine oil dilution and engine oil emulsification exists or not is judged before the vehicles are on the market, so that the vehicles with the defects are prevented from flowing into the market, the quality of the vehicles is improved, and the after-sale maintenance or recall cost is saved.
2. According to the engine oil dilution control method, whether the vehicle can improve the engine oil dilution condition through the reversion working condition is verified through the reversion working condition, if the engine oil dilution rate after the reversion working condition meets the engine oil dilution judgment standard, the reversion working condition is judged to improve the engine oil dilution, and correspondingly, if the engine oil emulsification condition of the vehicle meets the engine oil emulsification judgment standard, the engine oil dilution condition can be improved through the reversion working condition, so that the maintenance cost is saved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is a schematic structural view of the oil dipstick of the test sample car.
In the figure, 1 is the oil level gauge, 2 is the lower limit of the oil level gauge, and 3 is the oil level height.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the method for the comprehensive verification test of engine oil emulsification and engine oil dilution comprises the following steps:
step one, preparing two test sample vehicles, running in according to the use instruction, replacing engine oil and an engine oil filter after the running in is finished, and filling the engine oil to a position close to the upper limit of an oil rule. And (2) driving the test sample car at the speed of 40 +/-2 km/h for 15 +/-1 min under the condition that the ambient temperature is-35 to-15 ℃, driving the automatic transmission car in a D-gear mode, driving the manual transmission car in a 3 or 4 gear mode, then placing the test sample car in a natural environment for cooling, and cooling the engine oil and the cooling liquid in the engine to the ambient temperature.
Checking the liquid level height of the engine oil of the vehicle, referring to fig. 2, setting an index of the lower limit 2 of the engine oil level at the end position of the engine oil level 1, measuring the liquid level height 3 of the engine oil in the oil sump by referring to the index of the lower limit 2 of the engine oil level, firstly measuring twice, taking the average value of the two measurement results as the measurement result and recording if the liquid level difference value measured twice is less than or equal to 2mm, taking the average value of the two measurement results which are similar in value as the measurement result and recording if the liquid level difference value measured twice is greater than 2 mm.
And taking the measured height of the engine oil liquid level as an initial liquid level value, if the engine oil liquid level is more than 10mm above the lower limit of the engine oil dipstick, carrying out a subsequent test, and if the engine oil liquid level is less than 10mm above the lower limit of the engine oil dipstick, filling the engine oil.
Step two, verifying the working condition:
1) starting the test sample car, idling in situ for 120 plus or minus 5s if the ambient temperature is more than or equal to-25 ℃ and less than-25 ℃ if the ambient temperature is more than or equal to-35 ℃, and idling in situ for 300 plus or minus 10 s; if the ambient temperature is less than-35 ℃, suspending the test, and when the ambient temperature is recovered to-35 ℃ or above, recovering the test.
2) Starting to accelerate to 15 +/-2 km/h, driving at a constant speed for 10 +/-2 s, and then stopping and idling in situ for 20 +/-2 s.
3) Starting to accelerate to 30 +/-2 km/h, driving at a constant speed for 30 +/-2 s, and then stopping and idling in situ for 20 +/-2 s.
4) Starting to accelerate to 50 +/-2 km/h, driving at a constant speed for 20 +/-2 s, and then stopping and idling in situ for 10 +/-2 s.
5) Repeating the steps 2), 3) and 4) for four times, stopping the vehicle, extinguishing the vehicle, standing and cooling for more than 4 hours, and measuring the liquid level height of the engine oil.
Step three, repeating step two and stopping and extinguishing after verifying the working condition for 5 times, disassembling the engine oil port cover, the oil rule and the cylinder cover and checking the engine oil emulsification condition, wherein the checking items comprise:
oil filling port cover: whether white foam is attached to the inner surface of the oil filling port cover and the amount of the white foam;
an oil level gauge: drawing out the oil level gauge, and observing whether the engine oil attached to the bottom of the oil level gauge becomes turbid or not;
a cylinder head cover: whether white foam is attached to the inner surface of the cylinder head cover and the amount of the white foam;
an antifreeze kettle: and observing whether the antifreeze in the antifreeze kettle becomes turbid or not.
And after the inspection is finished, restoring the test sample car to the original state, standing and cooling for more than 4 hours, and measuring the liquid level height of the engine oil.
Step four, repeating the step two to verify the working condition for 30 times, stopping and extinguishing the engine, disassembling an engine oil cover, an oil rule and a cylinder cover of the engine, and checking the engine oil emulsification condition; after the inspection is finished, the test sample car is restored to the original state, the test sample car is kept stand and cooled for more than 8 hours, the oil level height is measured, then 200mL of engine oil in an engine oil pan is collected, the engine oil dilution rate is detected, and if the engine oil dilution rate is more than 10%, the engine oil dilution is judged to occur; and meanwhile, if the collected engine oil dilution rate is greater than 10%, carrying out a reversion working condition, stopping and flameout the test sample vehicle after the test sample vehicle runs for 1 hour at the speed of 60 +/-2 km/h, standing and cooling for more than 4 hours, collecting 200mL of engine oil in an oil pan of the engine, checking the engine oil dilution rate, judging that the reversion working condition improves the engine oil dilution if the engine oil dilution rate after the reversion working condition meets the engine oil dilution judgment standard, and otherwise, judging that the reversion working condition cannot improve the engine oil dilution. Whether the vehicle can improve the machine oil dilution condition through the operating mode that reverses is verified through the operating mode that reverses, if the machine oil dilution rate after the operating mode that reverses satisfies the machine oil and dilutes the judgement standard, then judge that the operating mode that reverses improves machine oil and dilute, if correspondingly vehicle machine oil emulsification condition satisfies machine oil emulsification judgement standard, then can improve the machine oil dilution condition through the operating mode that reverses, practiced thrift cost of maintenance.
And step three and step four, after the emulsification condition is checked, confirming according to an engine oil emulsification judgment standard, if the engine oil emulsification judgment standard is not met, stopping the test, judging that the engine oil is emulsified, and if the engine oil emulsification judgment standard is met, continuing the test.
The engine oil emulsification judgment standard is as follows: through the verification working condition of the second step, when the following conditions occur, the engine oil is judged to have an emulsification condition, and the use requirement of a user cannot be met:
a. more than 50% of the area of the inner surface of the oil filling port cover is adhered with obvious white foam;
b. obviously turbid engine oil is adhered to the bottom of the oil rule, and the engine oil is milky;
c. more than 50% of the area of the inner surface of the cylinder head cover is adhered with obvious white foam;
d. the antifreeze in the antifreeze kettle is in a whitish state and is turbid.
And step two, step three and step four are carried out after the oil level height is measured, the oil is confirmed according to an oil dilution judgment standard, if the oil level height does not meet the judgment standard, the test is stopped, the oil is judged to be diluted, and if the oil level height meets the requirement, the test is continued.
The engine oil dilution determination standard is as follows: through the verification working condition of the second step, when the following conditions occur, it is judged that the engine oil is diluted, and the use requirements of users cannot be met:
e. in the 1 st to 29 th circulation, the height of the oil level relative to the initial liquid level rises by more than 10 mm;
f. in the 30 th circulation, the height of the liquid level of the engine oil rises by more than 7mm relative to the height of the initial liquid level;
g. and step four, the engine oil dilution rate is more than 10%.
And step two, step three and step four, the environmental temperature in the standing cooling process is required to be lower than 0 ℃, and if the environmental temperature is higher than 0 ℃, the verification working condition is stopped. The test sample car is guaranteed to be always at a lower environmental temperature, and the influence of the environmental temperature on the verification result is avoided.
The invention effectively simulates the running condition that the vehicle has short single running distance and low running speed in a low-temperature environment and is stopped or stopped during running by limiting and verifying the working condition parameters, and can fully verify whether the engine of the vehicle has the risks of engine oil emulsification and engine oil dilution by combining the engine oil emulsification judgment standard and the engine oil dilution judgment standard. Whether the risk of engine oil dilution and engine oil emulsification exists or not is judged before the vehicles are on the market, so that the vehicles with the defects are prevented from flowing into the market, the quality of the vehicles is improved, and the after-sale maintenance or recall cost is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An engine oil emulsification and engine oil dilution comprehensive verification test method is characterized by comprising the following steps:
firstly, preparing a test sample vehicle, driving the test sample vehicle at the speed of 40 +/-2 km/h for 15 +/-1 min under the condition that the environmental temperature is-35 to-15 ℃, then placing the test sample vehicle in a natural environment for cooling, and cooling engine oil and cooling liquid in an engine to the environmental temperature;
step two, verifying the working condition:
1) starting the test sample car, idling in situ for 120 plus or minus 5s if the ambient temperature is more than or equal to-25 ℃ and less than-25 ℃ if the ambient temperature is more than or equal to-35 ℃, and idling in situ for 300 plus or minus 10 s;
2) starting to accelerate to 15 +/-2 km/h, driving at a constant speed for 10 +/-2 s, and then stopping and idling in situ for 20 +/-2 s;
3) starting to accelerate to 30 +/-2 km/h, driving at a constant speed for 30 +/-2 s, and then stopping and idling in situ for 20 +/-2 s;
4) starting to accelerate to 50 +/-2 km/h, driving at a constant speed for 20 +/-2 s, and then stopping and idling in situ for 10 +/-2 s;
5) repeating the steps 2), 3) and 4) for four times, stopping the vehicle, extinguishing the vehicle, standing and cooling for more than 4 hours, and measuring the liquid level height of the engine oil;
step three, stopping and extinguishing after the working condition is verified for 5 times by repeating the step two, disassembling an engine oil port cover, an oil rule and a cylinder cover of the engine and checking the engine oil emulsification condition; after the inspection is finished, the test sample car is restored to the original state, is kept stand and cooled for more than 4 hours, and the liquid level height of the engine oil is measured;
step four, repeating the step two to verify the working condition for 30 times, stopping and extinguishing the engine, disassembling an engine oil cover, an oil rule and a cylinder cover of the engine, and checking the engine oil emulsification condition; after the inspection is finished, the test sample car is restored to the original state, the test sample car is kept stand and cooled for more than 8 hours, the oil level height is measured, then 200mL of engine oil in an engine oil pan is collected, the engine oil dilution rate is detected, and if the engine oil dilution rate is more than 10%, the engine oil dilution is judged to occur;
checking the emulsification condition, confirming according to an engine oil emulsification judgment standard, judging that the engine oil is emulsified if the engine oil emulsification judgment standard is not met, and continuing the test if the engine oil emulsification judgment standard is not met;
and step two, step three and step four are carried out after the oil level height is measured, the oil is confirmed according to an oil dilution judgment standard, if the oil level height does not meet the judgment standard, the test is stopped, the oil is judged to be diluted, and if the oil level height meets the requirement, the test is continued.
2. The method for the integrated verification test of the emulsification of engine oil and the dilution of engine oil according to claim 1, wherein the inspection items of the emulsification of engine oil in the third step and the fourth step include:
oil filling port cover: whether white foam is attached to the inner surface of the oil filling port cover and the amount of the white foam;
an oil level gauge: drawing out the oil level gauge, and observing whether the engine oil attached to the bottom of the oil level gauge becomes turbid or not;
a cylinder head cover: whether white foam is attached to the inner surface of the cylinder head cover and the amount of the white foam;
an antifreeze kettle: and observing whether the antifreeze in the antifreeze kettle becomes turbid or not.
3. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that the engine oil emulsification determination criterion is: through the verification working condition of the second step, when the following conditions occur, the engine oil is judged to have an emulsification condition, and the use requirement of a user cannot be met:
a. more than 50% of the area of the inner surface of the oil filling port cover is adhered with obvious white foam;
b. obviously turbid engine oil is adhered to the bottom of the oil rule, and the engine oil is milky;
c. more than 50% of the area of the inner surface of the cylinder head cover is adhered with obvious white foam;
d. the antifreeze in the antifreeze kettle is in a whitish state and is turbid;
the engine oil dilution determination standard is as follows: through the verification working condition of the second step, when the following conditions occur, it is judged that the engine oil is diluted, and the use requirements of users cannot be met:
e. in the 1 st to 29 th circulation, the height of the oil level relative to the initial liquid level rises by more than 10 mm;
f. in the 30 th circulation, the height of the liquid level of the engine oil rises by more than 7mm relative to the height of the initial liquid level;
g. and step four, the engine oil dilution rate is more than 10%.
4. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that: and if the engine oil dilution rate is larger than 10 percent in the fourth step, carrying out a reversion working condition, stopping and flameout the test sample vehicle after the test sample vehicle runs for 1 hour at the speed of 60 +/-2 km/h, standing and cooling for more than 4 hours, collecting 200mL of engine oil in an oil pan of the engine, checking the engine oil dilution rate, judging that the reversion working condition improves the engine oil dilution if the engine oil dilution rate after the reversion working condition meets the engine oil dilution judgment standard, and otherwise, judging that the reversion working condition cannot improve the engine oil dilution.
5. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that: the number of the test sample vehicles is at least two.
6. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that: and step two, when the working condition is verified, if the environmental temperature is lower than-35 ℃, suspending the test, and when the environmental temperature is recovered to-35 ℃ or higher, recovering the test.
7. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that: and when the test sample car in the second step, the third step and the fourth step is kept standing and cooled, if the environmental temperature is higher than 0 ℃, terminating the verification working condition.
8. The engine oil emulsification and engine oil dilution comprehensive verification test method according to claim 1 or 2, characterized in that: before the test sample car is subjected to verification test, running-in is carried out according to the use instruction, after the running-in is completed, engine oil and an engine oil filter are replaced, and the engine oil is filled to a position close to the upper limit of the oil level gauge.
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| CN112053039B (en) * | 2020-08-17 | 2024-04-23 | 安徽江淮汽车集团股份有限公司 | Engine oil dilution risk assessment method, device, equipment and storage medium |
| CN112196684A (en) * | 2020-09-08 | 2021-01-08 | 东风商用车有限公司 | Method and system for judging diesel engine oil fuel oil dilution |
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| CN104807953B (en) * | 2015-05-26 | 2016-04-27 | 重庆长安汽车股份有限公司 | A kind of method of quick detection oil dilution ratio |
| CN106840958B (en) * | 2017-03-14 | 2019-05-24 | 淮阴工学院 | A kind of in-use automotive oil dilution degree fast appraisement method |
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