CN111075534A - Crankcase ventilation system and integrity detection method thereof - Google Patents
Crankcase ventilation system and integrity detection method thereof Download PDFInfo
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- CN111075534A CN111075534A CN201911345025.4A CN201911345025A CN111075534A CN 111075534 A CN111075534 A CN 111075534A CN 201911345025 A CN201911345025 A CN 201911345025A CN 111075534 A CN111075534 A CN 111075534A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 94
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000009757 thermoplastic moulding Methods 0.000 claims description 3
- 238000011016 integrity testing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 35
- 238000003745 diagnosis Methods 0.000 description 7
- 229920002302 Nylon 6,6 Polymers 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 229920009788 PA66 GF30 Polymers 0.000 description 1
- 229920006497 PA66-GF30 Polymers 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012643 polycondensation polymerization Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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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
- F01M2013/0077—Engine parameters used for crankcase breather systems
- F01M2013/0083—Crankcase pressure
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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 discloses a crankcase ventilation system and an integrity detection method thereof, and belongs to the technical field of engines. The crankcase ventilation system includes: the oil-gas separator is arranged on a cylinder cover assembly of the engine; the first one-way valve is integrated on the oil-gas separator; the second one-way valve is integrated on the air inlet pipe; the first ventilation channel is integrated on the cylinder cover assembly; the second ventilation channel is used for communicating the air inlet pipe with the oil-gas separator; a pressure sensor disposed on the intake manifold and configured to detect a negative pressure value within the intake manifold. According to the crankcase ventilation system provided by the invention, the first one-way valve is integrated on the oil-gas separator, the second one-way valve is integrated on the air inlet pipe, and the first ventilation channel is integrated on the cylinder cover assembly, so that the crankcase ventilation system meets the national six regulations and simultaneously obtains a certain exemption, only disconnection detection of the second ventilation channel is needed, and the detection cost is obviously reduced.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a crankcase ventilation system and an integrity detection method thereof.
Background
With the continuous implementation of the national six-emission regulation GB18352.6 of passenger vehicles in various regions, the engine needs to be equipped with a PCV (Positive Crankcase Ventilation) system that meets the national six-regulation; in order to ensure the integrity of the PCV system, it needs to be checked in case of a disconnection failure, and the ventilation cannot be effectively performed. At present, the mainstream detection scheme adopted by each manufacturer is a continuous diagnosis circuit scheme, which needs to integrate plug connectors in each ventilation pipeline of the PCV system, the plug connectors collect corresponding electric signals and transmit the electric signals to an Electronic Control Unit (ECU) of an automobile, integrity diagnosis is performed through an On-Board Diagnostics (OBD), if the PCV system has a disconnected place, OBD alarm is triggered, and a fault code is displayed, so that a person can know the fault type in time and perform corresponding maintenance. Because the existing scheme needs to set the plug connector, the cost is increased, and meanwhile, the error triggering of the alarm can be caused by continuously diagnosing the circuit fault which happens to the circuit, and the after-sale experience of a customer is influenced.
Therefore, it is desirable to provide a crankcase ventilation system and an integrity detection method thereof to solve the above problems.
Disclosure of Invention
The invention aims to provide a crankcase ventilation system, which can obviously reduce the manufacturing cost of a PCV system.
The invention also aims to provide an integrity detection method of the crankcase ventilation system, so as to avoid false alarm caused by detection by adopting a continuous diagnosis circuit scheme in the prior art and improve after-sale experience of customers.
In order to realize the purpose, the following technical scheme is provided:
a crankcase ventilation system comprising:
the oil-gas separator is arranged on a cylinder cover assembly of the engine;
the first one-way valve is integrated on the oil-gas separator;
the second one-way valve is integrated on the air inlet pipe;
a first ventilation passage integrated in said cylinder head assembly, said first ventilation passage communicating between said gas-oil separator and an intake manifold and being configured to introduce crankcase gases into said intake manifold at low engine load and to block gas outflow in said intake manifold at high engine load and positive intake manifold pressure via said first one-way valve integrated in said gas-oil separator in said first ventilation passage;
a second vent passage for communicating the intake pipe with the gas-oil separator, and configured to introduce the crankcase gas into the air-filtered intake pipe at a time of a large load of the engine, and to block gas from flowing into the intake manifold through the second check valve integrated on the intake pipe in the second vent passage at a time of a small load of the engine;
a pressure sensor disposed on the intake manifold and configured to detect a negative pressure value within the intake manifold.
Preferably, the second ventilation channel adopts a hose pipeline.
Preferably, a PCV valve is integrated in the gas-oil separator, and the crankcase gas enters the first ventilation passage or the second ventilation passage via the PCV valve.
Preferably, the first check valve and the oil-gas separator are integrated by welding.
Preferably, the first check valve is integrated with the oil separator by means of friction welding.
Preferably, the second check valve and the air inlet pipe are integrated in a thermoplastic molding mode.
Preferably, the first ventilation channel and the cylinder cover assembly are integrally formed by casting.
Preferably, the oil-gas separator and the cylinder head assembly are fastened through a bolt structure.
A method of integrity testing a crankcase ventilation system according to any of the preceding claims, comprising the steps of:
if the reduction of the negative pressure value detected by the pressure sensor is larger than a threshold value, triggering an OBD alarm and displaying an abnormal fault code of a crankcase ventilation system;
and if the reduction of the negative pressure value detected by the pressure sensor is smaller than the threshold value, judging that the crankcase ventilation system works normally, and not alarming by the OBD.
Preferably, the threshold value is 20 kPa.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the crankcase ventilation system, the first one-way valve is integrated on the oil-gas separator, the second one-way valve is integrated on the air inlet pipe, and the first ventilation channel is integrated on the cylinder cover assembly, so that the crankcase ventilation system meets the national six regulations and simultaneously obtains a certain exemption, only disconnection detection of the second ventilation channel is needed, the structure is simple, the reliability is high, the integrity detection flow of the PCV system is effectively simplified, and the detection cost is remarkably reduced.
2) The integrity detection method provided by the invention fully utilizes the pressure sensor at the position of the air inlet manifold in the existing engine structure to carry out the integrity detection of the PCV system, and meanwhile, the traditional continuous diagnosis circuit detection is replaced by the pressure detection, so that the method not only can meet the regulation of the national six regulations, but also avoids the false alarm phenomenon caused by circuit faults when the continuous diagnosis circuit is adopted for detection, and has low cost and high reliability.
Drawings
FIG. 1 is a schematic illustration of a PCV system in an embodiment of the invention;
FIG. 2 is a schematic view of an oil-gas separator integrated on a cylinder head assembly according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a prior art PCV system;
FIG. 4 is a schematic structural diagram of an oil-gas separator in the embodiment of the invention;
fig. 5 is a schematic structural diagram of an intake pipe in an embodiment of the present invention.
Reference numerals:
100. 100' -a crankcase; 200. 200' -air filtration; 300. 300' -a supercharger; 400. 400' -a throttle body;
10. 10' -an oil-gas separator; 20-a cylinder head assembly; 30. 30' -an air inlet pipe; 40. 40' -a first ventilation channel; 50. 50' -a second ventilation channel; 60. 60' -an intake manifold; 70. 70' -a pressure sensor;
11. 11' -a first one-way valve; 12-an output gas pipe; 31. 31' -second one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Before describing the crankcase ventilation system disclosed in the present embodiment, provision for monitoring the PCV system according to article j.4.9 of the sixth country, namely: if the vehicle uses the PCV system, the PCV system should be checked to ensure system integrity. The specific monitoring mode is the regulation of regulation J.4.9.2.2: the OBD system should detect this failure if the crankcase is disconnected from the PCV valve, or the PCV valve is disconnected from the intake manifold. The PCV valve herein refers to a pressure control valve disposed between the crankcase ventilation system and the engine intake system for regulating the flow of gases produced by the crankcase ventilation system into the intake system. Meanwhile, since the six nations mandate that positive crankcase ventilation must be employed, the crankcase ventilation system in this embodiment is defaulted to be a PCV system in regulation (i.e., a positive crankcase ventilation system).
Of course, article j.4.9.2.3, article j.4.9.2.4 and article j.4.9.2.5 of the sixth regulation of state also provide some exemption conditions, which provides possibility for simplifying a specific integrity detection method; the specific laws are as follows:
item j.4.9.2.3: if the PCV valve is fastened directly to the crankcase and it is more difficult to remove the PCV valve from the crankcase than to disconnect the PCV valve from the intake manifold, disconnection failure detection of the crankcase and PCV valve may be allowed to be disabled.
Item j.4.9.2.4: for systems that use hard tubing to connect the PCV valve and the crankcase, the connection between the crankcase and the PCV valve may not be detected.
Item j.4.9.2.5: the following may not be detected for a disconnection failure between the PCV valve and the intake manifold: (1) the vehicle immediately stalls when idling; (2) the PCV system is an integral part of the intake system and therefore the connection between the valves and the intake manifold is not normally broken (e.g., by machined passages rather than by piping or hoses). Wherein the valve of condition (2) includes all valves or orifices for controlling or limiting crankcase ventilation.
The crankcase ventilation system disclosed in the embodiment is based on the exemption conditions, meets the national six-regulation, reduces the integrity detection cost of the PCV system, and is suitable for wide popularization and application. Specifically, referring to fig. 1 and 2, the present embodiment provides a crankcase ventilation system including:
the oil-gas separator 10 is arranged on a cylinder cover assembly 20 of the engine;
the first one-way valve 11 is integrated on the oil-gas separator 10;
a second check valve 31 integrated on the intake pipe 30;
a first ventilation passage 40 integrated on the cylinder head assembly 20, wherein the first ventilation passage 40 is communicated with the gas-oil separator 10 and the intake manifold 60, and is configured to introduce gas in the crankcase 100 into the intake manifold 60 when the engine is in a small load state, and prevent the gas in the intake manifold 60 from flowing out through a first check valve 11 integrated on the gas-oil separator 10 in the first ventilation passage 40 when the engine is in a large load state and the intake manifold 60 is in a positive pressure state;
a second ventilation passage 50 for communicating the intake pipe 30 with the gas-oil separator 10, and configured to introduce the gas in the crankcase 100 into the intake pipe 30 after the air filter 200 at a time of a large engine load, and to block the gas from flowing into the intake manifold 60 through a second check valve 31 integrated in the intake pipe 30 in the second ventilation passage 50 at a time of a small engine load;
a pressure sensor 70 is provided on the intake manifold 60 and configured to detect a negative pressure value within the intake manifold 60.
Further, the crankcase ventilation system further includes a PCV valve integrated in the oil-gas separator 10, and the gas in the crankcase 100 enters the first ventilation passage 40 or the second ventilation passage 50 through the PCV valve. Referring to fig. 2, since the gas-oil separator 10 is fixedly connected to the cylinder head assembly 20, which forms a part of the engine, the provision of the PCV valve satisfies the specification of item j.4.9.2.3, and allows avoidance of disconnection failure detection of the crankcase 100 from the PCV valve. Optionally, the oil-gas separator 10 and the cylinder head assembly 20 are fastened through a bolt structure. Further, the crankcase ventilation system further comprises a supercharger 300 and a throttle body 400, which are arranged on a connection path when the engine works under a heavy load, and after the air in the crankcase 100 is mixed with the air passing through the air filter 200, the air sequentially passes through the supercharger 300 and the throttle body 400 and enters the intake manifold 60.
Referring to fig. 3, in the prior art, a first hose is adopted between the oil separator 10 ' and the intake manifold 60 ' and is connected with the intake pipe 30 ' through a second hose to form a first ventilation channel 40 ' and a second ventilation channel 50 ', and meanwhile, a first check valve 11 ' is arranged on the first hose, and a second check valve 31 ' is arranged on the second hose to meet the conditions of different engine loads; since hose lines are arranged between the first check valve 11 'and the gas inlet pipe 30' and the gas-oil separator 10 'and between the second check valve 31' and the gas-oil separator 10 'and the gas inlet manifold 60', the prior art does not meet the exemption regulations of item J.4.9.2.5, and therefore plug connectors must be arranged on corresponding hoses to perform continuous circuit diagnosis. In the embodiment, referring to fig. 4, the first check valve 11 is integrated on the oil-gas separator 10, and the first ventilation channel 40 is directly integrated on the cylinder head assembly 20, so that no pipeline is arranged between the first check valve 11 and the oil-gas separator 10, and the arrangement of the first check valve 11 and the first ventilation channel 40 meets item j.4.9.2.5 (item 2), so that exemptions are obtained; further, the second check valve 31 is directly integrated on the air inlet pipe 30, namely fastened on the air inlet pipe 30, and no pipeline is arranged between the air inlet pipe 30 and the second check valve 31, so that the connection between the second check valve 31 and the air inlet manifold 60 is not broken, and the exemption of item (2) of item j.4.9.2.5 is also obtained, and at the moment, only the detection of the disconnection of the second ventilation channel 50 is needed.
Further, with continued reference to fig. 2, the first vent passage 40 is integrally formed with the cylinder head assembly 20 by casting, so that the first vent passage 40 satisfies the exemption of item j.4.9.2.5 (item 2).
Further, the first check valve 11 is integrated on the oil-gas separator 10 by welding, so as to be fastened with the oil-gas separator 10. Optionally, the first check valve 11 is integrated with the oil-gas separator 10 by friction welding; further, in order to realize friction welding, the optional oil-gas separator 10 and the first check valve 11 are made of a PA66 material, the material is also called polyamide 66 or nylon 66, and is formed by condensation polymerization of adipic acid and hexamethylene diamine, so that the shock resistance and the high strength performance are realized, and the stable connection between the first check valve 11 and the oil-gas separator 10 can be improved; further optionally, the oil-gas separator 10 and the first check valve 11 are made of PA66-GF30, that is, 30% glass fiber is added to PA66 plastic raw material, so as to further improve the rigidity and dimensional stability of the parts.
Optionally, the second ventilation channel 50 employs a hose line; further alternatively, referring to fig. 2, an output air pipe 12 is provided on the oil separator 10 for connecting a hose line of the second ventilation channel 50.
Further, referring to fig. 5, the second check valve 31 is integrated with the air inlet pipe 30 by means of thermoplastic molding, so as to fasten the second check valve 31 with the air inlet pipe 30. Further optionally, the second check valve 31 and the air inlet pipe 30 are both made of PP material.
According to the crankcase ventilation system provided by the embodiment, the PCV valve and the first one-way valve 11 are integrated on the oil-gas separator 10, the second one-way valve 31 is integrated on the air inlet pipe 30, and the first ventilation channel 40 is integrated on the cylinder cover assembly 20, so that the crankcase ventilation system can meet the national six regulations and simultaneously obtain certain exemptions, only disconnection detection of the second ventilation channel 50 is needed, the structure is simple, the reliability is high, the integrity detection flow of the PCV system is effectively simplified, and the detection cost is remarkably reduced.
The embodiment also discloses an integrity detection method of the crankcase ventilation system, which is used for carrying out integrity detection on the crankcase ventilation system so as to prevent the crankcase ventilation system from being disconnected. As can be seen from the above description, the second ventilation channel 50 of the crankcase ventilation system provided by the present embodiment is a detachable connection pipe, and therefore cannot be exempted from the regulation of item j.4.9.2.5, so that according to the regulation of item j.4.9.2, if the second ventilation channel 50 is disconnected from the air inlet pipe 30 or the air-oil separator 10, an OBD alarm should be triggered. In this embodiment, the specific detection method includes the following steps:
if the reduction of the negative pressure value detected by the pressure sensor 70 is larger than the threshold value, triggering an OBD alarm and displaying an abnormal fault code of the crankcase ventilation system; if the reduction of the negative pressure value detected by the pressure sensor 70 is smaller than the threshold value, the normal operation of the crankcase ventilation system is judged, and the OBD does not give an alarm.
The specific principle is as follows: when the second ventilation channel 50 is disconnected, the negative pressure in the intake manifold 60 draws air into the intake manifold 60 through the disconnection point and the first ventilation channel 40, thereby causing the negative pressure value in the intake manifold 60 to become smaller; tests prove that under the condition that the second ventilation channel 50 is disconnected and not disconnected, the pressure difference in the intake manifold 60 can reach at least 20kPa, so that the threshold value of the selectable negative pressure value reduction amount is 20kPa in the embodiment; the threshold value may be adaptively changed according to different engine types.
In specific implementation, because the pressure sensor 70 'is arranged at the position of the intake manifold 60' of the existing engine, the integrity detection method provided by the embodiment makes full use of the pressure sensor 70 'at the position of the intake manifold 60' in the existing structure to carry out the integrity detection of the PCV system, and meanwhile, the pressure detection is adopted to replace the traditional continuous diagnosis circuit detection, so that the method not only can meet the regulation of the national six regulations, but also avoids the phenomenon of false alarm caused by circuit faults, and has low cost and high reliability.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A crankcase ventilation system, comprising:
the oil-gas separator (10) is arranged on a cylinder cover assembly (20) of the engine;
a first one-way valve (11) integrated on the gas-oil separator (10);
a second check valve (31) integrated on the intake pipe (30);
a first ventilation passage (40) integrated on the cylinder head assembly (20), wherein the first ventilation passage (40) is communicated with the oil-gas separator (10) and an intake manifold (60), and is configured to introduce gas in a crankcase (100) into the intake manifold (60) when the engine is in a small load state, and prevent the gas in the intake manifold (60) from flowing out through the first check valve (11) integrated on the oil-gas separator (10) in the first ventilation passage (40) when the engine is in a large load state and the intake manifold (60) is in a positive pressure state;
a second ventilation passage (50) for communicating the intake pipe (30) with the gas-oil separator (10), and configured to introduce gas in the crankcase (100) into the intake pipe (30) after an air filter (200) at a time of a large engine load, and to block gas from flowing into the intake manifold (60) at a time of a small engine load through the second check valve (31) integrated in the intake pipe (30) in the second ventilation passage (50);
a pressure sensor (70) disposed on the intake manifold (60) and configured to detect a negative pressure value within the intake manifold (60).
2. The crankcase ventilation system according to claim 1, wherein the second ventilation passage (50) is a hose line.
3. The crankcase ventilation system according to claim 1, further comprising a PCV valve integrated in the oil separator (10), wherein gas in the crankcase (100) enters the first ventilation passage (40) or the second ventilation passage (50) via the PCV valve.
4. Crankcase ventilation system according to claim 1, wherein the first non return valve (11) is integrated with the gas-oil separator (10) by means of welding.
5. Crankcase ventilation system according to claim 4, wherein the first non return valve (11) is integrated with the gas-oil separator (10) by means of friction welding.
6. Crankcase ventilation system according to claim 1, wherein the second non return valve (31) is integrated with the air inlet conduit (30) by means of thermoplastic moulding.
7. The crankcase ventilation system according to claim 1, wherein the first ventilation passage (40) is integrally formed with the head assembly (20) by casting.
8. The crankcase ventilation system according to claim 1, wherein the gas-oil separator (10) and the head assembly (20) are fastened by a bolt structure.
9. A method of integrity testing a crankcase ventilation system according to any one of claims 1-8 comprising the steps of:
if the reduction of the negative pressure value detected by the pressure sensor (70) is larger than a threshold value, triggering an OBD alarm and displaying an abnormal fault code of the crankcase ventilation system;
and if the reduction of the negative pressure value detected by the pressure sensor (70) is smaller than the threshold value, judging that the crankcase ventilation system works normally, and not alarming by the OBD.
10. The integrity detection method of claim 9, wherein the threshold value is 20 kPa.
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| CN201911345025.4A CN111075534B (en) | 2019-12-24 | 2019-12-24 | Crankcase ventilation system and integrity detection method thereof |
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| CN201911345025.4A CN111075534B (en) | 2019-12-24 | 2019-12-24 | Crankcase ventilation system and integrity detection method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284747A (en) * | 2020-10-26 | 2021-01-29 | 无锡沃尔福汽车技术有限公司 | Function test equipment for engine crankcase ventilation system and arrangement method |
| CN113202594A (en) * | 2021-04-26 | 2021-08-03 | 联合汽车电子有限公司 | Crankcase ventilation system, diagnostic method and storage medium |
| CN114076013A (en) * | 2020-08-19 | 2022-02-22 | 深圳臻宇新能源动力科技有限公司 | Ventilation system of engine crankcase |
| CN114320526A (en) * | 2020-09-30 | 2022-04-12 | 深圳臻宇新能源动力科技有限公司 | Crankcase ventilation system and air leakage diagnosis method thereof |
| CN115788669A (en) * | 2022-10-31 | 2023-03-14 | 重庆长安汽车股份有限公司 | Crankcase ventilation system diagnosis method, device, equipment and storage medium |
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