CN116818358A - Method for testing anti-icing performance of engine air inlet system and crankcase ventilation system - Google Patents
Method for testing anti-icing performance of engine air inlet system and crankcase ventilation system Download PDFInfo
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- CN116818358A CN116818358A CN202310738562.5A CN202310738562A CN116818358A CN 116818358 A CN116818358 A CN 116818358A CN 202310738562 A CN202310738562 A CN 202310738562A CN 116818358 A CN116818358 A CN 116818358A
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- 238000012360 testing method Methods 0.000 title claims abstract description 91
- 238000009423 ventilation Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims description 28
- 230000007613 environmental effect Effects 0.000 claims abstract description 24
- 239000010705 motor oil Substances 0.000 claims abstract description 17
- 238000007689 inspection Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 1
- 238000010998 test method Methods 0.000 abstract description 9
- 238000012795 verification Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- SAZUGELZHZOXHB-UHFFFAOYSA-N acecarbromal Chemical compound CCC(Br)(CC)C(=O)NC(=O)NC(C)=O SAZUGELZHZOXHB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The invention relates to a test method for anti-icing performance of an engine air inlet system and a crankcase ventilation system, which comprises the steps of vehicle servicing, test and monitoring, disassembling inspection and result judgment. Aiming at the use requirements of actual users and market problems, the invention summarises and provides a brand-new and high-efficiency whole vehicle bench test vehicle speed curve, test flow and evaluation standard for verifying the anti-icing performance of an engine air inlet system and a crankcase ventilation system; through the whole vehicle indoor test method, the anti-icing performance of the engine air inlet system and the crankcase ventilation system can be rapidly and accurately verified, and the problems of throttle valve faults, supercharger impeller damage, engine oil leakage and the like caused by icing of the engine air inlet system and the crankcase ventilation system can be effectively avoided correspondingly. Meanwhile, the test can simulate winter test conditions based on verification of the whole vehicle rack in the environmental bin, can verify at any time without being limited by seasons, can repeatedly verify different design schemes for many times, and greatly shortens development period.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a whole automobile test method for verifying anti-icing performance of an engine air inlet system and a crankcase ventilation system of a passenger car based on an environmental bin.
Background
During operation of the engine, some of the combustible mixture and combustion products may blow-by into the crankcase via the piston rings and through the cylinders. These substances, if not removed in time, will accelerate the deterioration of the engine oil and will cause corrosion or rust to the parts. And because the gas that is blowby into the crankcase contains HC and other contaminants, it is not allowed to be vented to the atmosphere. Currently, forced crankcase ventilation systems used in automotive engines introduce waste crankcase gas into the intake system and then into the engine for combustion, preventing crankcase gas from damaging the engine and being vented to the atmosphere to cause pollution. However, because the waste water contains vapor generated by combustion, the crankcase ventilation system and the engine air intake system are often frozen in low-temperature areas in winter, and the serious problems of deterioration or leakage of engine oil with excessive crankcase pressure, broken and broken ice in the engine air intake system, damage to a supercharger impeller, freezing of a throttle valve, incapability of normal starting and the like can occur due to freezing and blocking of the ventilation pipe.
For the problems, various anti-icing measures are adopted by a train enterprise to ensure the normal running of a vehicle at low temperature, but in the development process, the anti-icing performance of an air inlet system and a crankcase ventilation system of a passenger car engine is verified, and at present, an engine bench test mode and a whole train road test mode are mostly adopted for verification. The test of the engine bench has limitation, various performance performances of the engine and actual performance of the whole vehicle have certain difference, and the test of the engine bench cannot completely and effectively verify the anti-icing performance of the whole vehicle. Meanwhile, the road whole vehicle test verifies that the anti-icing performance has the problems of long test period, complex working condition, low repeatability, large influence by factors of seasons and test areas, high verification cost and the like. Therefore, it is necessary to develop a whole vehicle test method for verifying the anti-icing performance of an engine air intake system and a crankcase ventilation system based on an environmental chamber, and to rapidly, efficiently and accurately verify the anti-icing performance of the engine air intake system and the crankcase ventilation system.
Disclosure of Invention
The invention aims to provide a whole vehicle test method for verifying the anti-icing performance of an engine air inlet system and a crankcase ventilation system of a passenger vehicle based on an environmental bin, so as to solve the problem of rapidly and accurately verifying the anti-icing performance of the engine air inlet system and the crankcase ventilation system.
The invention aims at realizing the following technical scheme:
a test method for anti-icing performance of an engine air inlet system and a crankcase ventilation system comprises the following steps:
A. preparing a vehicle;
B. performing test and monitoring according to the curve;
C. after the test working condition curve is successfully completed, disassembling and checking;
D. and judging whether the anti-icing performance of the engine air inlet system and the crankcase ventilation system is qualified.
Further, the step A specifically comprises the following steps:
a1, performing vehicle safety inspection;
a2, arranging 1 pressure sensor for monitoring a crankcase pressure value in the test process, and 1 thermocouple temperature sensor for recording the ambient temperature, wherein the sensors are connected with a data acquisition system;
a3, placing the vehicle into an environment cabin and fixing the environment cabin on a chassis dynamometer to obtain test running resistance, and connecting a tail row system;
a4, setting the environmental temperature of the environmental laboratory.
Further, in step A2, 1 pressure sensor is arranged at the engine oil filling port position of the vehicle engine through the perforation of the engine oil cover, and 1 thermocouple temperature sensor is arranged at the air outlet of the environmental chamber.
Further, in step A4, the environmental temperature of the environmental laboratory is set to-40 DEG C
Further, the step B specifically comprises the following steps:
b1, after the temperature of the environment simulation test room reaches the set temperature, placing the vehicle for 12 hours, and ensuring that the deviation between the temperature of engine cooling liquid and engine oil and the temperature of the environment is within +/-2 ℃;
and B2, starting a data acquisition system by a test engineer to record data and monitor the pressure of a crankcase in the test process, and driving the vehicle by a driver according to the test working condition.
Further, in the step B2, the air conditioner is set to be in a state of highest temperature, maximum air quantity, external circulation and foot blowing in the test; the speed of the windward fan of the vehicle follows the speed of the vehicle.
And step B2, stopping the test if the curve pressure is abnormal, and finishing the test curve if the anti-icing performance is unqualified.
Further, step C is specifically:
c1, maintaining a low-temperature environment, disassembling a throttle valve, an air inlet pipe, a crankcase ventilation small-load pipeline, a crankcase ventilation large-load pipeline and a PCV valve body for inspection, or checking icing conditions of all parts and pipelines by using inspection devices such as an endoscope and photographing and preserving;
and C2, maintaining a low-temperature environment, recovering the whole machine to an initial state before the test, starting ignition, and confirming whether one-time success is achieved or not and whether related fault alarms of a throttle valve and a crank system occur or not.
Further, meeting the following requirements determines that the anti-icing performance of the engine air intake system and the crankcase ventilation system is acceptable, otherwise, the anti-icing performance is not acceptable:
d1, under the running condition of the automobile, the pressure in the crankcase rises to be not more than 5kPa;
d2, after the test is finished, the ignition is successfully resumed once, the engine performance is normal, and no throttle related fault prompt exists;
and D3, after the test is finished, the icing phenomenon cannot occur in each pipeline of the engine air inlet system and the crankcase ventilation system, but frost and fog can be attached.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the use requirements of actual users and market problems, the invention summarises and provides a brand-new and high-efficiency whole vehicle bench test vehicle speed curve, test flow and evaluation standard for verifying the anti-icing performance of an engine air inlet system and a crankcase ventilation system; through the whole vehicle indoor test method, the anti-icing performance of the engine air inlet system and the crankcase ventilation system can be rapidly and accurately verified, and the problems of throttle valve faults, supercharger impeller damage, engine oil leakage and the like caused by icing of the engine air inlet system and the crankcase ventilation system can be effectively avoided correspondingly. Meanwhile, the test can simulate winter test conditions based on verification of the whole vehicle rack in the environmental bin, can verify at any time without being limited by seasons, can repeatedly verify different design schemes for many times, and greatly shortens development period.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of testing anti-icing performance of an engine air intake system and crankcase ventilation system of the present invention;
FIG. 2 is a graph of test conditions.
Detailed Description
The invention is further illustrated by the following examples:
aiming at the use requirements of actual users and market problems, the invention summarises and provides a brand new whole vehicle bench test vehicle speed curve and test flow and evaluation standard for efficiently verifying the anti-icing performance of an engine air inlet system and a crankcase ventilation system. The test method comprises the following four steps:
step one, vehicle servicing.
And step two, performing test and monitoring.
And step three, disassembling and checking.
And step four, judging the result.
The specific requirements of the vehicle servicing are as follows:
11. vehicle safety checks are carried out as required by GB/T12534.
12. And 1 pressure sensor is arranged at the engine oil filling port of the vehicle engine through the perforation of the engine oil cover for monitoring the pressure value of the crankcase in the test process, and 1 thermocouple temperature sensor is arranged at the air outlet of the environmental cabin for recording the environmental temperature, and the sensor is connected with the data acquisition system.
13. The vehicle is placed in an environment cabin and fixed on a chassis dynamometer, and the test running resistance is obtained according to the requirement of C.5.2.1.2 in the GB 18352.5-2013 standard, and the tail row system is connected.
14. The environmental laboratory set the ambient temperature to-40 ℃. The temperature of 40 ℃ below zero can cover the lowest winter temperature in most areas in China, and the verification environment temperature is slightly severe so that the icing problem of the market can be fully covered by the actual use requirement of customers.
Step two, testing according to a curve and monitoring specific requirements as follows:
21. after the temperature of the environment simulation test room reaches the set temperature, the vehicle is placed for 12 hours (namely, the vehicle is put out and immersed for 720 minutes), and the deviation between the temperature of engine cooling liquid and engine oil and the temperature of the environment is ensured to be within +/-2 ℃.
22. The test engineer starts the data acquisition system to record data and monitor the pressure of the crankcase in the test process, the driver drives the vehicle according to the test condition requirement, the test condition curve is shown in the following figure 2, and the environmental temperature in the whole test process is kept at-40 ℃. In the test, the air conditioner is set to be in a state of highest temperature, maximum air quantity, external circulation and foot blowing; the speed of the windward fan of the vehicle follows the speed of the vehicle. If the Curve pressure is abnormal, stopping the test, and failing the anti-icing performance. If normal, the test curve is completed.
Step three, the specific requirements of the disassembly inspection are as follows:
after the test condition curve is successfully completed (the flameout immersion is finished for 240 min).
And (3) maintaining a low-temperature environment, disassembling a throttle valve, an air inlet pipe, a crankcase ventilation small-load pipeline, a crankcase ventilation large-load pipeline and a PCV valve body for inspection, or checking icing conditions of all parts and pipelines by using an inspection device such as an endoscope and photographing and preserving.
And (3) maintaining a low-temperature environment, recovering the whole machine to an initial state before the test, starting ignition, and confirming whether the operation is successful once or not and whether related fault alarms of a throttle valve and a crank system occur or not.
Step four, the specific requirements of the result judgment are as follows:
meanwhile, the following requirements are met, and the anti-icing performance of the engine air inlet system and the crankcase ventilation system is judged to be qualified, otherwise, the anti-icing performance is judged to be unqualified:
a. under the running condition of the automobile, the pressure in the crankcase rises to be not more than 5kPa;
b. after the test is finished, the ignition is successfully resumed once, the engine performance is normal, and no throttle related fault prompt exists;
c. after the test is finished, all pipelines of an engine air inlet system and a crankcase ventilation system cannot be frozen, but frost fog can be attached (spongy thin ice can be seen as frost).
The invention simulates winter environment based on the environmental chamber, and verifies the anti-icing performance on the whole vehicle rack; the ambient temperature of the test is-40 ℃, which is the optimal ambient temperature summarized by combining road test experience and the occurrence temperature of related market problems; the mode of punching and arranging the pressure sensor on the engine oil cover of the vehicle engine is a special and optimal mode; the test working condition curve is obtained by analyzing a great amount of user working conditions and road test routes, and is protected; the evaluation mode of the anti-icing performance comprises three dimensions of crankcase pressure, whether icing exists or not and ignition rechecking, and the evaluation mode is more sufficient and comprehensively protected; the invention can verify the anti-icing performance of the engine air inlet system and the crankcase ventilation system at the same time.
Example 1
The problem that the supercharger impeller is damaged by the vibration of ice residues after the engine air inlet pipe is frozen and restarted occurs in the cold region road test process of the development of a certain automobile brand vehicle type. Then, road test conditions are basically finished in winter, and the method is adopted to carry out the problem reproduction of the original vehicle proposal and the anti-icing performance verification of the design improvement proposal in an environment simulation laboratory.
The specific process of the first step is as follows:
vehicle safety checks are carried out as required by GB/T12534.
And 1 pressure sensor is arranged at the engine oil filling port of the vehicle engine through the punching of the engine oil cover for monitoring the pressure value of the crankcase in the test process, the specific punching installation mode is shown in the following diagram, and 1 thermocouple temperature sensor is arranged at the air outlet of the environmental cabin for recording the environmental temperature.
The vehicle is placed in an environment cabin and fixed on a chassis dynamometer, and the test running resistance is obtained according to the requirement of C.5.2.1.2 in the GB 18352.5-2013 standard, and the tail row system is connected.
The environmental laboratory set the ambient temperature to-40 ℃.
The specific process of the second step is as follows:
after the temperature of the environment simulation test room reaches the set temperature, the vehicle is placed for 12 hours (namely, the vehicle is put out and immersed for 720 minutes), and the deviation between the temperature of engine cooling liquid and engine oil and the temperature of the environment is ensured to be within +/-2 ℃.
The test engineer starts the data acquisition system to record data and monitor the pressure of the crankcase in the test process, and the driver drives the vehicle according to the requirements of the test working condition, the test working condition is shown in the following figure 2, and the environmental temperature in the whole test process is kept at-40 ℃.
The specific process of the third step is as follows:
and (3) maintaining a low-temperature environment, disassembling a throttle valve, an air inlet pipe, a crankcase ventilation small-load pipeline, a crankcase ventilation large-load pipeline and a PCV valve body, checking icing conditions of all parts, and photographing.
The low-temperature environment is kept, the whole machine is restored to the initial state before the test, ignition is started, and the vehicles of the original vehicle proposal and the design improvement proposal are free from abnormality.
The specific process of the fourth step is as follows:
and when the icing occurs in the air inlet pipe of the engine, judging that the icing prevention performance of the air inlet system of the engine and the crankcase ventilation system is unqualified, and accurately verifying and reproducing the road test problem.
According to the design improvement scheme, all pipelines of the vehicle are not frozen, the crankcase pressure is not abnormal, and the secondary ignition starting is not abnormal, so that the anti-icing performance of the engine air inlet system and the crankcase ventilation system is judged to be qualified.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A method for testing anti-icing performance of an engine air intake system and a crankcase ventilation system, comprising the steps of:
A. preparing a vehicle;
B. performing test and monitoring according to the curve;
C. after the test working condition curve is successfully completed, disassembling and checking;
D. and judging whether the anti-icing performance of the engine air inlet system and the crankcase ventilation system is qualified.
2. The method for testing the anti-icing performance of an engine air intake system and a crankcase ventilation system according to claim 1, wherein step a comprises the following steps:
a1, performing vehicle safety inspection;
a2, arranging 1 pressure sensor for monitoring a crankcase pressure value in the test process, and 1 thermocouple temperature sensor for recording the ambient temperature, wherein the sensors are connected with a data acquisition system;
a3, placing the vehicle into an environment cabin and fixing the environment cabin on a chassis dynamometer to obtain test running resistance, and connecting a tail row system;
a4, setting the environmental temperature of the environmental laboratory.
3. The method for testing anti-icing performance of an engine air intake system and a crankcase ventilation system of claim 2, wherein: and A2, punching and arranging 1 pressure sensor at the engine oil filling port of the vehicle engine through an engine oil cover, and arranging 1 thermocouple temperature sensor at the air outlet of the environmental cabin.
4. The method for testing anti-icing performance of an engine air intake system and a crankcase ventilation system of claim 2, wherein: and A4, setting the environmental temperature of the environmental laboratory to-40 ℃.
5. The method for testing the anti-icing performance of an engine air intake system and a crankcase ventilation system according to claim 1, wherein step B comprises the steps of:
b1, after the temperature of the environment simulation test room reaches the set temperature, placing the vehicle for 12 hours, and ensuring that the deviation between the temperature of engine cooling liquid and engine oil and the temperature of the environment is within +/-2 ℃;
and B2, starting a data acquisition system by a test engineer to record data and monitor the pressure of a crankcase in the test process, and driving the vehicle by a driver according to the test working condition.
6. The method for testing anti-icing performance of an engine air intake system and crankcase ventilation system of claim 5, wherein: step B2, setting the air conditioner in the test to be in a state of highest temperature, maximum air quantity, external circulation and foot blowing; the speed of the windward fan of the vehicle follows the speed of the vehicle.
7. The method for testing anti-icing performance of an engine air intake system and crankcase ventilation system of claim 5, wherein: and B2, stopping the test if the communication pressure is abnormal, and finishing the test curve if the anti-icing performance is unqualified.
8. The method for testing the anti-icing performance of an engine air intake system and a crankcase ventilation system according to claim 1, wherein step C comprises:
c1, maintaining a low-temperature environment, disassembling a throttle valve, an air inlet pipe, a crankcase ventilation small-load pipeline, a crankcase ventilation large-load pipeline and a PCV valve body for inspection, or checking icing conditions of all parts and pipelines by using inspection devices such as an endoscope and photographing and preserving;
and C2, maintaining a low-temperature environment, recovering the whole machine to an initial state before the test, starting ignition, and confirming whether one-time success is achieved or not and whether related fault alarms of a throttle valve and a crank system occur or not.
9. The method for testing the anti-icing performance of an engine air intake system and a crankcase ventilation system according to claim 1, wherein the following requirements are met and the anti-icing performance of the engine air intake system and the crankcase ventilation system is judged to be acceptable, otherwise, the anti-icing performance of the engine air intake system and the crankcase ventilation system is judged to be disacceptable:
d1, under the running condition of the automobile, the pressure in the crankcase rises to be not more than 5kPa;
d2, after the test is finished, the ignition is successfully resumed once, the engine performance is normal, and no throttle related fault prompt exists;
and D3, after the test is finished, the icing phenomenon cannot occur in each pipeline of the engine air inlet system and the crankcase ventilation system, but frost and fog can be attached.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310738562.5A CN116818358A (en) | 2023-06-21 | 2023-06-21 | Method for testing anti-icing performance of engine air inlet system and crankcase ventilation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310738562.5A CN116818358A (en) | 2023-06-21 | 2023-06-21 | Method for testing anti-icing performance of engine air inlet system and crankcase ventilation system |
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