CN116660084A - Low-temperature engine oil dilution measurement method for supercharged direct injection gasoline engine of passenger car - Google Patents
Low-temperature engine oil dilution measurement method for supercharged direct injection gasoline engine of passenger car Download PDFInfo
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- CN116660084A CN116660084A CN202310583646.6A CN202310583646A CN116660084A CN 116660084 A CN116660084 A CN 116660084A CN 202310583646 A CN202310583646 A CN 202310583646A CN 116660084 A CN116660084 A CN 116660084A
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- 239000010705 motor oil Substances 0.000 title claims abstract description 80
- 238000010790 dilution Methods 0.000 title claims abstract description 34
- 239000012895 dilution Substances 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 title claims abstract description 17
- 239000007924 injection Substances 0.000 title claims abstract description 17
- 238000000691 measurement method Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 239000003921 oil Substances 0.000 claims abstract description 35
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 238000007598 dipping method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000012356 Product development Methods 0.000 abstract description 3
- 230000008859 change Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
-
- 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
-
- 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 low-temperature engine oil dilution rapid measurement method for a pressurized direct injection gasoline engine of a passenger car, belongs to the technical field of engine oil dilution measurement, and defines an engine oil dilution measurement method and specific hub test working conditions. In the product development stage, the vehicle state ensures that ECU data are normal, the engine works normally, the test is carried out according to the low-speed small-load working condition under the condition of the low-temperature rotating hub environment bin temperature of minus 35 ℃, the engine oil temperature is monitored, when the engine oil temperature reaches 40 ℃, the test is stopped immediately, the engine is stopped, the engine is kept for 6 hours after the engine oil temperature stands still, the small-load working condition test is continued when the standby oil temperature is consistent with the environment temperature, the engine is carried out repeatedly until the accumulated test mileage reaches 200km, the test is ended, the oil discharge weighing is carried out, the change quantity of the engine oil is compared, and the engine oil dilution degree is calculated.
Description
Technical Field
The invention belongs to the technical field of engine oil dilution measurement, in particular relates to a rapid measurement method for engine oil dilution in a low-temperature state of a pressurized direct injection engine of a passenger car, and provides a small-load driving engine oil dilution rapid measurement method for a cabin-hub automobile based on a low-temperature environment.
Background
At present, emission regulations are stricter, in order to meet emission requirements and ensure certain engine performance, more and more direct injection gasoline engines are developed and applied in a large quantity by various automobile manufacturers, when the engine works under low-temperature environment and under small load, the atomization rate of fuel oil is low under low-temperature condition, oil film with certain thickness is formed on the wall surface of a cylinder due to wall collision or untimely evaporation in the process of directly injecting the fuel oil into the cylinder, and when a piston reciprocates, the oil film flows into a crankcase along the wall of the cylinder, so that engine oil is diluted, the lubricating performance of the engine oil is reduced, and further the problems of increased friction loss, reduced mechanical efficiency, reduced dynamic performance, delayed VVT response, reduced reliability, reduced service life and the like are caused, and at the same time, the fuel economy is reduced, and the emission characteristic is deteriorated.
The engine oil dilution phenomenon is more and more emphasized by various domestic automobile manufacturers and research institutions, and a small-load engine oil dilution test under a low-temperature condition can be carried out in a product development stage, as described in CN111207928A patent:
1. undefined test subjects;
2. the test is carried out in a cold region, so that the convenience of the test is affected;
3. the temperature sensor is not arranged to monitor the temperature of engine oil, so that the test working condition can not be accurately controlled;
4. the accuracy of the measurement result is affected by judging through measuring the liquid level of the engine oil. As described in CN112098260a patent:
5. in the test process, oil is discharged and weighed for multiple times, the accuracy of a measurement result is affected, and the level of engine oil dilution is not rapidly and accurately mastered.
Disclosure of Invention
Aiming at the existing problems, the invention provides a method for quickly measuring the low-temperature engine oil dilution of a pressurized direct injection gasoline engine of a passenger car, and the engine oil dilution measurement method and specific hub test working conditions are defined. In the product development stage, the vehicle state ensures that ECU data are normal, the engine works normally, the test is carried out according to the low-speed small-load working condition under the condition of the low-temperature rotating hub environment bin temperature of minus 35 ℃, the engine oil temperature is monitored, when the engine oil temperature reaches 40 ℃, the test is stopped immediately, the engine is stopped, the engine is kept for 6 hours after the engine oil temperature stands still, the small-load working condition test is continued when the standby oil temperature is consistent with the environment temperature, the engine is carried out repeatedly until the accumulated test mileage reaches 200km, the test is ended, the oil discharge weighing is carried out, the change quantity of the engine oil is compared, and the engine oil dilution degree is calculated.
The invention is realized by the following technical scheme:
a low-temperature engine oil dilution measurement method for a supercharged direct injection gasoline engine of a passenger car specifically comprises the following steps:
step S1: setting test conditions;
step S2: preparing before testing;
step S3: and (3) under the test condition of the low-temperature hub-rotating environmental bin, when the temperature of the engine oil reaches 40 ℃, suspending the test of the vehicle dipping again, carrying out the test repeatedly until the accumulated test mileage reaches 200km, ending the test, discharging the oil, weighing, comparing the variation of the engine oil, and calculating the dilution degree of the engine oil.
Further, the setting test conditions in step S1 includes:
1) Vehicle requirements: at least two vehicles to be tested, the ECU data of the vehicles to be tested are normal, and the engine works normally;
2) Low temperature hub environment bin, temperature requirement: -35 ℃;
3) And (3) detecting equipment: an environment temperature sensor, an engine oil temperature sensor, an electronic scale and a vessel.
Further, the pre-test preparation in step S2 includes:
1) Running in the vehicle for 1000km;
2) Installing a temperature sensor and measuring the ambient temperature and the engine oil temperature;
3) The engine oil is put clean until the oil drops are no longer dropped;
4) And adding new engine oil until the middle of the oil rule graduation line, and recording the adding quantity M1 and the current apparent mileage L1 at the moment.
Further, in step S3, the low-temperature hub environmental chamber test conditions include the following:
1) Starting;
2) Idling for 60s;
3) Keeping the small load to run for 2km;
4) Repeating the steps 2) and 3), when the temperature of engine oil reaches 40 ℃, flameout and vehicle dipping are carried out for 6 hours;
5) Running for 200km in an accumulated manner according to the step 4), and stopping the test;
6) Discharging oil until oil drops are no longer falling, weighing, and recording the discharge amount M2 of engine oil;
7) And (3) calculating: oil dilution ratio= (M2-M1)/M1.
Further, the vehicle speed for keeping the small load running is 25km/h to 30km/h.
Compared with the prior art, the invention has the following advantages:
1. the invention definitely tests the object to be the whole car carrying the supercharged direct injection gasoline engine;
2. the test working condition is carried out on the low-temperature environment bin rotating hub, is not influenced by factors such as seasons, places and the like, and is more convenient to test;
3. according to the invention, the temperature of engine oil is monitored by adopting the installation sensor, and when the temperature of the engine oil reaches 40 ℃, a test is stopped, so that the test working condition is controlled more accurately;
4. according to the invention, the engine oil dilution rate is measured in a calculation mode, and the test result is more accurate;
5. according to the invention, the oil discharging weighing is carried out once when the test mileage reaches 200km, so that errors caused by oil discharging in the test process are avoided, and the test result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic flow chart of a low-temperature engine oil dilution measurement method for a supercharged direct injection gasoline engine of a passenger car;
fig. 2 is a schematic diagram of the engine oil dilution principle.
Detailed Description
For a clear and complete description of the technical scheme and the specific working process thereof, the following specific embodiments of the invention are provided with reference to the accompanying drawings in the specification:
in the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Example 1
A low-temperature engine oil dilution measurement method for a supercharged direct injection gasoline engine of a passenger car specifically comprises the following steps:
step S1: setting test conditions;
step S2: preparing before testing;
step S3: and (3) under the test condition of the low-temperature hub-rotating environmental bin, when the temperature of the engine oil reaches 40 ℃, suspending the test of the vehicle dipping again, carrying out the test repeatedly until the accumulated test mileage reaches 200km, ending the test, discharging the oil, weighing, comparing the variation of the engine oil, and calculating the dilution degree of the engine oil.
Further, the setting test conditions in step S1 includes:
1) Vehicle requirements: at least two vehicles to be tested, the ECU data of the vehicles to be tested are normal, and the engine works normally;
2) Low temperature hub environment bin, temperature requirement: -35 ℃;
3) And (3) detecting equipment: an environment temperature sensor, an engine oil temperature sensor, an electronic scale and a vessel.
Further, the pre-test preparation in step S2 includes:
1) Running in the vehicle for 1000km;
2) Installing a temperature sensor and measuring the ambient temperature and the engine oil temperature;
3) The engine oil is put clean until the oil drops are no longer dropped;
4) And adding new engine oil until the middle of the oil rule graduation line, and recording the adding quantity M1 and the current apparent mileage L1 at the moment.
Further, in step S3, the low-temperature hub environmental chamber test conditions include the following:
1) Starting;
2) Idling for 60s;
3) Keeping the small load to run for 2km;
4) Repeating the steps 2) and 3), when the temperature of engine oil reaches 40 ℃, flameout and vehicle dipping are carried out for 6 hours;
5) Running for 200km in an accumulated manner according to the step 4), and stopping the test;
6) Discharging oil until oil drops are no longer falling, weighing, and recording the discharge amount M2 of engine oil;
7) And (3) calculating: oil dilution ratio= (M2-M1)/M1.
Further, the vehicle speed for keeping the small load running is 25km/h to 30km/h.
Example 2
When the automobile runs on the environment bin rotating hub under small load, the environment temperature is minus 35 ℃, for a supercharged direct injection engine, after fuel oil enters a cylinder, the atomization rate is insufficient under the low-temperature condition, an oil film with a certain thickness is formed on the wall surface of the cylinder due to wall collision or untimely evaporation, and when a piston reciprocates, the oil film flows into a crankcase along the wall of the cylinder, so that engine oil is diluted. Through continuous small load operation, when the engine oil temperature reaches 40 ℃, the test vehicle dipping is stopped immediately, when the standby oil temperature is consistent with the ambient temperature, the small load operation is continued, when the engine oil temperature reaches 40 ℃, the test vehicle dipping is stopped again, the test is performed repeatedly until the accumulated test mileage reaches 200km, the test is ended, the oil discharging is weighed, the change quantity of the engine oil is compared, and the engine oil dilution degree is calculated.
Specifically, as shown in fig. 1, a flow chart of a low-temperature engine oil dilution measurement method for a supercharged direct injection engine of a passenger car according to the embodiment is shown, and the measurement method specifically includes the following steps:
test conditions:
1) Vehicle requirements: at least 2 vehicles, normal ECU data and normal engine operation;
2) Low temperature hub environment bin, temperature requirement: -35 ℃;
3) And (3) detecting equipment: an environmental temperature sensor, an engine oil temperature sensor, an electronic scale, a vessel and the like;
preparation before test:
1) Running in the vehicle for 1000km;
2) Mounting a temperature sensor and testing: measuring the ambient temperature and the engine oil temperature;
3) Cleaning engine oil until oil drops are no longer dropped;
4) And adding new engine oil until the new engine oil is approximately in the middle of the scale marks of the engine oil rule, and recording the adding amount M1 and the current apparent mileage L1 at the moment.
3. Low temperature hub environment bin test conditions:
1) Starting;
2) Idling for 60s;
3) Keeping the running under a small load for 2km (the speed of the vehicle is 25 km/h-30 km/h);
4) Repeating the steps 2) and 3), and when the temperature of engine oil reaches 40 ℃, flameout and vehicle dipping are carried out for 6 hours;
5) Running for 200km in an accumulated manner according to the step 4), and stopping the test;
6) Discharging oil until oil drops are no longer falling, weighing, and recording the discharge amount M2 of engine oil;
7) And (3) calculating: oil dilution ratio= (M2-M1)/M1.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (5)
1. The low-temperature engine oil dilution measurement method for the supercharged direct injection gasoline engine of the passenger car is characterized by comprising the following steps of:
step S1: setting test conditions;
step S2: preparing before testing;
step S3: and (3) under the test condition of the low-temperature hub-rotating environmental bin, when the temperature of the engine oil reaches 40 ℃, suspending the test of the vehicle dipping again, carrying out the test repeatedly until the accumulated test mileage reaches 200km, ending the test, discharging the oil, weighing, comparing the variation of the engine oil, and calculating the dilution degree of the engine oil.
2. The method for measuring low-temperature engine oil dilution of a supercharged direct injection gasoline engine of a passenger car according to claim 1, wherein the setting test conditions in the step S1 include:
1) Vehicle requirements: at least two vehicles to be tested, the ECU data of the vehicles to be tested are normal, and the engine works normally;
2) Low temperature hub environment bin, temperature requirement: -35 ℃;
3) And (3) detecting equipment: an environment temperature sensor, an engine oil temperature sensor, an electronic scale and a vessel.
3. The method for measuring low-temperature engine oil dilution of a supercharged direct injection gasoline engine of a passenger car according to claim 1, wherein the pre-test preparation in step S2 comprises:
1) Running in the vehicle for 1000km;
2) Installing a temperature sensor and measuring the ambient temperature and the engine oil temperature;
3) The engine oil is put clean until the oil drops are no longer dropped;
4) And adding new engine oil until the middle of the oil rule graduation line, and recording the adding quantity M1 and the current apparent mileage L1 at the moment.
4. The method for measuring the dilution of low-temperature engine oil of the supercharged direct injection gasoline engine of the passenger car according to claim 1, wherein in the step S3, the test conditions of the low-temperature rotating hub environment bin comprise the following contents:
1) Starting;
2) Idling for 60s;
3) Keeping the small load to run for 2km;
4) Repeating the steps 2) and 3), when the temperature of engine oil reaches 40 ℃, flameout and vehicle dipping are carried out for 6 hours;
5) Running for 200km in an accumulated manner according to the step 4), and stopping the test;
6) Discharging oil until oil drops are no longer falling, weighing, and recording the discharge amount M2 of engine oil;
7) And (3) calculating: oil dilution ratio= (M2-M1)/M1.
5. The method for measuring the low-temperature engine oil dilution of the supercharged direct injection gasoline engine of the passenger car according to claim 4, wherein the speed of the passenger car which keeps running under a small load is 25km/h to 30km/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310583646.6A CN116660084A (en) | 2023-05-23 | 2023-05-23 | Low-temperature engine oil dilution measurement method for supercharged direct injection gasoline engine of passenger car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310583646.6A CN116660084A (en) | 2023-05-23 | 2023-05-23 | Low-temperature engine oil dilution measurement method for supercharged direct injection gasoline engine of passenger car |
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| Publication Number | Publication Date |
|---|---|
| CN116660084A true CN116660084A (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310583646.6A Pending CN116660084A (en) | 2023-05-23 | 2023-05-23 | Low-temperature engine oil dilution measurement method for supercharged direct injection gasoline engine of passenger car |
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| Country | Link |
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| CN (1) | CN116660084A (en) |
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- 2023-05-23 CN CN202310583646.6A patent/CN116660084A/en active Pending
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