CN111663981A - Closed crankcase ventilation system for engine and vehicle - Google Patents
Closed crankcase ventilation system for engine and vehicle Download PDFInfo
- Publication number
- CN111663981A CN111663981A CN202010627129.0A CN202010627129A CN111663981A CN 111663981 A CN111663981 A CN 111663981A CN 202010627129 A CN202010627129 A CN 202010627129A CN 111663981 A CN111663981 A CN 111663981A
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- China
- Prior art keywords
- oil
- gas
- engine
- ventilation system
- crankcase ventilation
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
- F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0038—Layout of crankcase breathing systems
- F01M2013/0044—Layout of crankcase breathing systems with one or more valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M2013/0038—Layout of crankcase breathing systems
- F01M2013/005—Layout of crankcase breathing systems having one or more deoilers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention provides a closed crankcase ventilation system for an engine and a vehicle. The closed crankcase ventilation system includes: the oil-gas separator is used for separating high-temperature oil gas which enters a crankcase after being combusted in an engine cylinder or mixed oil gas which is mixed with fresh air; and the negative pressure guide device is respectively connected with the air outlet end of the oil-gas separator and the air inlet end of the engine post-treatment system, and is used for guiding the exhaust gas separated by the oil-gas separator to the engine post-treatment system so as to reprocess the exhaust gas by using the engine post-treatment system and discharge the reprocessed exhaust gas to the air outside the vehicle. The scheme of the invention can completely avoid the influence of oil gas on the performance of related parts caused by the fact that the waste gas separated by the existing crankshaft ventilation system enters the air inlet system, and has no over-high requirement on the separation efficiency of the oil-gas separator.
Description
Technical Field
The invention relates to the technical field of crankcase ventilation systems, in particular to a closed crankcase ventilation system for an engine and a vehicle.
Background
Along with the overall improvement of the performance of the engine, oil consumption and emission regulations are stricter and stricter, so that the research on a ventilation system of an engine crankcase is more and more emphasized in each host factory, and the improvement of the oil-gas separation efficiency and the reliability are more and more important.
The principle of the closed crankcase ventilation system is that when an engine works, part of combustible mixed gas and waste gas flee into the crankcase through a piston ring, the crankcase ventilation system can separate oil and gas of the oil fleeing into the crankcase, separated engine oil returns to an oil pan, and the separated waste gas is continuously upgraded along with the requirements of regulations and needs to enter an engine air inlet system again, so that the pollution of the air directly discharged into the atmosphere is reduced. The crankcase ventilation system has multiple functions, can keep the internal pressure of the engine crankcase stable, avoid leakage of each sealing surface, prevent deterioration of lubricating oil and dilution of engine oil by fuel oil, reduce abrasion and corrosion of parts, also enable separated waste gas to reenter the cylinder to participate in combustion, recover combustible gas in the waste gas and reduce pollution of the separated waste gas to the environment.
The prior closed type crank system leads out oil gas in a crank case, after the oil gas is separated by an oil-gas separator, the separated engine oil is returned to an oil pan, the separated waste gas is led into a pipeline in front of an inlet of a supercharger compressor through a pipeline, the stable pressure of the crank case is kept through the negative pressure action at the inlet of the supercharger compressor, and simultaneously the waste gas is pressurized by the supercharger compressor and returns to an engine cylinder again to participate in combustion.
However, since the oil-gas separator cannot completely separate oil and gas therein, the performance of the engine is affected in many ways after a long-time operation, for example, part of the oil and gas pollutes the pressure impeller of the supercharger, so that the efficiency of the supercharger is reduced. Partial oil gas enters the intercooler after being pressurized by the supercharger, and because the intercooler cools the pressurized air, water vapor and oil gas in the gas are condensed in the intercooler, so that the performance of the intercooler is reduced. For an engine injected by an air inlet channel, oil gas contained in the air inlet can pollute the head of the oil sprayer and influence the performance of the oil sprayer.
Disclosure of Invention
The invention aims to solve the technical problem of pollution of relevant parts in an air intake system caused by introducing exhaust gas separated by an oil-gas separator into the air intake system in the prior art.
The invention also aims to solve the technical problem that the requirement on the separation effect of the oil-gas separator is high due to the fact that the waste gas separated by the oil-gas separator needs to be introduced into the air inlet system in the prior art.
In particular, the present invention provides a closed crankcase ventilation system for an engine comprising:
the oil-gas separator is used for separating high-temperature oil gas which enters a crankcase after being combusted in an engine cylinder or mixed oil gas which is mixed with fresh air;
and the negative pressure guide device is respectively connected with the air outlet end of the oil-gas separator and the air inlet end of the engine post-treatment system, and is used for guiding the exhaust gas separated by the oil-gas separator to the engine post-treatment system so as to reprocess the exhaust gas by using the engine post-treatment system and discharge the reprocessed exhaust gas to the air outside the vehicle.
Optionally, the negative pressure guide device is further connected with an exhaust end of a vortex end of a supercharger of the vehicle.
Optionally, the negative pressure directing device has a body and a vent associated with the engine aftertreatment system, the vent being smaller in size than the body to create a negative pressure at the vent to direct the exhaust gas to the engine aftertreatment system.
Optionally, the negative pressure guide device is an ejector pipe or a venturi pipe.
Optionally, the closed crankcase ventilation system further comprises:
and the control valve is arranged between the oil separator and the negative pressure guide device and is used for being controlled to be opened to a preset opening degree so as to control the flow rate of the waste gas separated through the oil separator.
Optionally, the control valve is configured to be in an open state at all times.
Optionally, the control valve is configured to maintain the opening thereof when the pressure in the crankcase satisfies a limit requirement, and adjust the opening of the control valve when the pressure in the crankcase does not satisfy the limit requirement, so that the pressure in the crankcase satisfies the limit requirement.
Alternatively, the limit is greater than or equal to-1 kPa and less than or equal to 0 kPa.
In particular, the invention also provides a vehicle comprising the closed crankcase ventilation system.
According to the scheme of the embodiment of the invention, the negative pressure guide device is arranged between the air outlet end of the oil-gas separator and the air inlet end of the engine post-treatment system, so that the waste gas separated by the oil-gas separator is directly guided to the engine post-treatment system and is discharged into the atmosphere after being reprocessed by the engine post-treatment system, and the influence of oil gas on the performance of related parts caused by the fact that the waste gas separated by the conventional crankshaft ventilation system enters the air inlet system is completely avoided.
In addition, the exhaust gas separated by the existing crankshaft ventilation system enters the air intake system again, and in order to prevent the pollution of oil gas in the exhaust gas to relevant parts of the air intake system, the oil gas content in the exhaust gas needs to be reduced to the greatest extent, so that the requirement on the separation efficiency of the oil-gas separator is higher.
In addition, because the flow rate of the exhaust gas separated by the oil-gas separator is very small relative to the flow rate of the exhaust gas in the exhaust system, the influence of the cross section of the drainage opening of the negative pressure guide device on the exhaust back pressure is very small, the influence on the exhaust system is negligible, and the exhaust gas in the crankshaft ventilation system contains a small amount of oxygen, so that the introduction into the exhaust system is beneficial to the oxidation reaction of the post-treatment of the exhaust system on the unburned HC to a certain extent, and the emission of the HC is reduced.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 shows a schematic block diagram of a closed crankcase ventilation system for an engine according to one embodiment of the invention;
in the figure: 1-an oil-gas separator, 2-a negative pressure guide device, 21-a drainage port, 22-a body, 3-an engine aftertreatment system, 4-a supercharger, 41-a vortex end, 5-an exhaust pipeline, 6-a control valve, 7-an oil pan, 8-a pressure sensor and 9-an engine.
Detailed Description
FIG. 1 shows a schematic block diagram of a closed crankcase ventilation system for an engine according to one embodiment of the invention. As shown in fig. 1, the closed crankcase ventilation system comprises an air-oil separator 1 and a negative pressure guide 2. The oil-gas separator 1 is used for separating high-temperature oil gas which enters a crankcase after being combusted in a cylinder of an engine 9 or mixed oil gas which is mixed with fresh air. The negative pressure guide device 2 is connected to the air outlet end of the oil-gas separator 1 and the air inlet end of the engine post-treatment system 3, and is configured to guide the exhaust gas separated by the oil-gas separator 1 to the engine post-treatment system 3, so as to reprocess the exhaust gas by the engine post-treatment system 3, and discharge the reprocessed exhaust gas to the air outside the vehicle.
According to the scheme of the embodiment of the invention, the negative pressure guide device 2 is arranged between the air outlet end of the oil-gas separator 1 and the air inlet end of the engine post-treatment system 3, so that the waste gas separated by the oil-gas separator 1 is directly guided to the engine post-treatment system 3 and is discharged into the atmosphere after being reprocessed by the engine post-treatment system 3, and the influence of oil gas on the performance of related parts caused by the fact that the waste gas separated by the conventional crankshaft ventilation system enters the air inlet system is completely avoided.
In addition, the exhaust gas separated by the existing crankshaft ventilation system enters the air intake system again, and in order to prevent the pollution of oil gas in the exhaust gas to relevant parts of the air intake system, the oil gas content in the exhaust gas needs to be reduced to the greatest extent, so that the requirement on the separation efficiency of the oil-gas separator 1 is high, and in the scheme of the embodiment of the invention, the separated exhaust gas directly enters the exhaust system of the engine 9 and is treated by the aftertreatment system and then discharged into the atmosphere, so that the requirement on the separation efficiency of the oil-gas separator 1 is not high.
In the embodiment shown in fig. 1, the underpressure-guiding device 2 is also connected to the exhaust end of the vortex end 41 of the supercharger 4 of the vehicle. Namely, the injection pipe is arranged on an exhaust pipeline 5 at the air outlet of a turbine of the supercharger 4 and is also communicated with an engine after-treatment system 3 and the oil-gas separator 1. The negative pressure guide device 2 has a body 22 and a vent 21 connected to the engine aftertreatment system 3, the vent 21 being smaller in size than the body 22 to create a negative pressure at the vent 21 to guide exhaust gas to the engine aftertreatment system 3. The ejector pipe is based on the principle that the pipe diameter is reduced, the flow velocity of airflow is increased at the necking part, and the pressure is reduced, so that negative pressure is generated at the necking part, the requirement that waste gas separated by the oil-gas separator 1 is introduced into the engine post-treatment system 3 is met, and the structure can also realize the same effect by using a Venturi tube structure based on the same principle.
As shown in fig. 1, the closed crankcase ventilation system further comprises a control valve 6, the control valve 6 being arranged between the gas-oil separator 1 and the negative pressure guide 2 for controlled opening to a preset opening degree for controlling the flow rate of the exhaust gas separated via the gas-oil separator 1. The control valve 6 is arranged to maintain its opening when the pressure in the crankcase meets the limit requirement, and to adjust the opening of the control valve 6 so that the pressure in the crankcase meets the limit requirement when the pressure in the crankcase does not meet the limit requirement. Wherein the limiting value is not less than-1 kPa and not more than 0 kPa. The control valve 6 is always in an open state.
The control valve 6 is opened on the principle that an Electronic Control Unit (ECU) of the vehicle detects a signal of the crankcase pressure sensor 8 to control the opening degree of the control valve 6. When the crankcase pressure satisfies a limit value of-1 kPa or more and 0kPa or less, the ECU controls the opening of the control valve 6 of the crank ventilation system to be constant. When the crankcase pressure does not meet the limit value, the ECU controls the opening of a control valve 6 of the crankshaft ventilation system to be adjusted to be larger or smaller, so that the crankcase pressure meets the limit value requirement.
The crankcase gas is led out from an engine 9 and separated into liquid and gas through the oil-gas separator 1, the liquid oil returns to the oil pan 7 through a pipeline, the gas exhaust gas enters the exhaust pipeline 5 through the pipeline and the control valve 6, and finally the gas exhaust gas is purified by the post-treatment system and is exhausted into the atmosphere. By providing the control valve 6, the pressure of the gas in the crankcase is stabilized, and it is ensured that the exhaust gas separated by the gas-oil separator 1 can smoothly flow to the negative pressure guide device 2.
According to the scheme of the embodiment of the invention, because the flow rate of the exhaust gas after being separated by the oil-gas separator 1 is very small relative to the flow rate of the exhaust gas of an exhaust system, the cross section of the drainage port 21 of the negative pressure guide device 2 has very small influence on the exhaust back pressure, the influence on the exhaust system is negligible, and the exhaust gas of a crankshaft ventilation system contains a small amount of oxygen, so that the introduction into the exhaust system is beneficial to the oxidation reaction of the exhaust system post-treatment on unburned HC to a certain extent, and the emission of HC is reduced.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A closed crankcase ventilation system for an engine, comprising:
the oil-gas separator is used for separating high-temperature oil gas which enters a crankcase after being combusted in an engine cylinder or mixed oil gas which is mixed with fresh air;
and the negative pressure guide device is respectively connected with the air outlet end of the oil-gas separator and the air inlet end of the engine post-treatment system, and is used for guiding the exhaust gas separated by the oil-gas separator to the engine post-treatment system so as to reprocess the exhaust gas by using the engine post-treatment system and discharge the reprocessed exhaust gas to the air outside the vehicle.
2. The closed crankcase ventilation system of claim 1, wherein the negative pressure guide is further coupled to an exhaust end of a volute end of a supercharger of the vehicle.
3. The closed crankcase ventilation system of claim 2, wherein the negative pressure directing device has a body and a drain associated with the engine aftertreatment system, the drain having a size smaller than a size of the body to create a negative pressure at the drain to direct the exhaust gas to the engine aftertreatment system.
4. The closed crankcase ventilation system according to any one of claims 1-3, wherein the negative pressure guide is a bleed tube or a venturi tube.
5. The closed crankcase ventilation system of claim 4, further comprising:
and the control valve is arranged between the oil separator and the negative pressure guide device and is used for being controlled to be opened to a preset opening degree so as to control the flow rate of the waste gas separated through the oil separator.
6. The closed crankcase ventilation system of claim 5, wherein the control valve is configured to be always in an open state.
7. The closed crankcase ventilation system of claim 6, wherein the control valve is configured to maintain its opening when the pressure in the crankcase meets a limit requirement, and wherein the opening of the control valve is sized to cause the pressure in the crankcase to meet the limit requirement when the pressure in the crankcase does not meet the limit requirement.
8. The closed crankcase ventilation system of claim 7, wherein the limit is greater than or equal to-1 kPa and less than or equal to 0 kPa.
9. A vehicle comprising a closed crankcase ventilation system according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010627129.0A CN111663981A (en) | 2020-07-02 | 2020-07-02 | Closed crankcase ventilation system for engine and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010627129.0A CN111663981A (en) | 2020-07-02 | 2020-07-02 | Closed crankcase ventilation system for engine and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN111663981A true CN111663981A (en) | 2020-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010627129.0A Pending CN111663981A (en) | 2020-07-02 | 2020-07-02 | Closed crankcase ventilation system for engine and vehicle |
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| CN (1) | CN111663981A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879121A (en) * | 2021-02-01 | 2021-06-01 | 浙江吉利控股集团有限公司 | Control method and control system of crankcase ventilation system |
| CN113389616A (en) * | 2021-07-30 | 2021-09-14 | 广西玉柴机器股份有限公司 | Method for preventing closed waste gas internal circulation from oil channeling |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2315301Y (en) * | 1997-11-13 | 1999-04-21 | 韦升永 | Negative pressure machine oil saving device for IC engine crank |
| DE10044922A1 (en) * | 2000-09-12 | 2002-04-04 | Hengst Walter Gmbh & Co Kg | Device for regulating pressure in crankcase of internal combustion engine, adjusts throttle valve between oil aerosol separator and suction section |
| KR20060068096A (en) * | 2004-12-15 | 2006-06-21 | 기아자동차주식회사 | Separating apparatus of blow-by gas for vehicle |
| CN208364204U (en) * | 2018-06-01 | 2019-01-11 | 湖南省力宇燃气动力有限公司 | crankcase ventilation system and gas engine |
| CN110067614A (en) * | 2018-01-24 | 2019-07-30 | 福特全球技术公司 | The inlet manifold of engine discharges assembly |
| CN209704669U (en) * | 2019-04-01 | 2019-11-29 | 浙江吉利新能源商用车集团有限公司 | A kind of crankcase ventilation system and vehicle for vehicle |
-
2020
- 2020-07-02 CN CN202010627129.0A patent/CN111663981A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2315301Y (en) * | 1997-11-13 | 1999-04-21 | 韦升永 | Negative pressure machine oil saving device for IC engine crank |
| DE10044922A1 (en) * | 2000-09-12 | 2002-04-04 | Hengst Walter Gmbh & Co Kg | Device for regulating pressure in crankcase of internal combustion engine, adjusts throttle valve between oil aerosol separator and suction section |
| KR20060068096A (en) * | 2004-12-15 | 2006-06-21 | 기아자동차주식회사 | Separating apparatus of blow-by gas for vehicle |
| CN110067614A (en) * | 2018-01-24 | 2019-07-30 | 福特全球技术公司 | The inlet manifold of engine discharges assembly |
| CN208364204U (en) * | 2018-06-01 | 2019-01-11 | 湖南省力宇燃气动力有限公司 | crankcase ventilation system and gas engine |
| CN209704669U (en) * | 2019-04-01 | 2019-11-29 | 浙江吉利新能源商用车集团有限公司 | A kind of crankcase ventilation system and vehicle for vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879121A (en) * | 2021-02-01 | 2021-06-01 | 浙江吉利控股集团有限公司 | Control method and control system of crankcase ventilation system |
| CN113389616A (en) * | 2021-07-30 | 2021-09-14 | 广西玉柴机器股份有限公司 | Method for preventing closed waste gas internal circulation from oil channeling |
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Application publication date: 20200915 |