Crankcase ventilation system and vehicle

Abstract

The utility model discloses a crankcase ventilation system and a vehicle, the crankcase ventilation system comprises a cylinder head cover, an air filter, an air inlet module, a connecting module and a ventilation pipeline, the connecting module comprises a first joint, a second joint and a sealing piece, the first joint comprises a connecting part and a diagnosis part connected to the peripheral side of the connecting part, and the second joint comprises a second joint and a sealing piece. The diagnosis part is provided with at least one through diagnosis hole, and the sealing piece is clamped between the connecting part and the second connector and blocks the diagnosis hole. The ventilation pipeline and the cylinder head cover are in gas path communication through the connecting module, the first connector is provided with a diagnosis hole, the sealing piece blocks the diagnosis hole in the normal working state, when the connecting position of the first connector and the second connector is disconnected, gas inlet pressure fluctuates, an alarm can be given, OBD diagnosis is completed through the structure of the connecting module, and the diagnosis efficiency is improved. No additional wire harness connection is needed, and the structure of the ventilation system is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine crankcase ventilation, especially to a crankcase ventilation system and vehicle. BACKGROUND

[0002] The crankcase ventilation system can introduce the exhaust gas discharged during the operation of the engine into the combustion chamber for burning, reduce the particulate matter and hydrocarbon emissions in the exhaust gas, and introduce fresh air into the crankcase to balance the pressure in the crankcase. The crankcase ventilation system needs to have OBD (On-Board Diagnostics) diagnosis or meet the exemption conditions, and the OBD can monitor whether the vehicle exhaust emission is over standard according to the operation of the engine and issue a fault warning.

[0003] In the related art, a conductive connector is arranged on the pipeline, the conductive connector is connected with the vehicle ECU (Electronic Control Unit) through a wire harness, and the OBD diagnosis is performed by comparing the voltage signal detected by the ECU with the set value. This method needs to connect the ECU and the conductive connector through the wire harness, and the connection of the wire harness is complicated, resulting in a relatively complex structure of the crankcase ventilation system. SUMMARY

[0004] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a crankcase ventilation system which can perform OBD diagnosis and simplify the structure of the crankcase ventilation system.

[0005] The utility model further provides a vehicle with the above crankcase ventilation system.

[0006] The crankcase ventilation system according to the first aspect of the utility model comprises:

[0007] The air cylinder cover, the air filter, the air inlet module, the connecting module and the ventilation pipeline, the air inlet module, the inner cavity of the air cylinder cover is communicated with the air inlet module; the connecting module comprises a first connector, a second connector and a sealing element, the first connector is connected with the air cylinder cover, the first connector comprises a connecting part and a diagnosis part connected with the periphery of the connecting part, the diagnosis part is provided with at least one through diagnosis hole, the inside of the connecting part is provided with a first channel, the diagnosis hole and the first channel are communicated with the inner cavity of the air cylinder cover, the connecting part is connected with the second connector, the sealing element is clamped between the diagnosis part and the second connector when the first connector and the second connector are normally connected, and the diagnosis hole is blocked, the sealing element releases the blocking of the diagnosis hole when the first connector and the second connector are connected with faults, so that the air inlet module appears pressure fluctuation; the ventilation pipeline is connected with the second connector and the air filter respectively, and the ventilation pipeline is communicated with the first channel.

[0008] According to the crankcase ventilation system, at least the following beneficial effects are achieved:

[0009] In the embodiment of the utility model, ventilation pipeline and air cylinder cover realize gas circuit intercommunication through connecting module, first connector in connecting module is equipped with diagnosis hole, sealing element blocks diagnosis hole in normal working condition, make ventilation pipeline and air cylinder cover keep sealed connection, when first connector and second connector connect with fault, air inlet pressure of air inlet module appears fluctuation and can alarm, OBD diagnosis utilizes self structure of connecting module to complete, need not to carry out wire harness connection additionally, simplify structure of ventilation system.

[0010] According to some embodiments of the utility model, the crankcase ventilation system further comprises a pressure detection element and a control module, the pressure detection element is in communication connection with the control module, the pressure detection element is used to detect the air pressure of the air inlet module, when the first connector and the second connector are connected with faults, the control module is configured to alarm according to the pressure fluctuation detected by the pressure detection element.

[0011] According to some embodiments of the utility model, the diagnosis part is provided with a plurality of, a plurality of diagnosis parts are arranged along the circumference of the connecting part, and each diagnosis part is provided with at least one diagnosis hole.

[0012] Alternatively, the diagnosis part is annular and is arranged around the outer periphery of the connecting part.

[0013] According to some embodiments of the utility model, the sealing element is annular and is arranged outside the connecting part.

[0014] According to some embodiments of the present application, the diagnostic part is provided with one diagnostic hole, which is arc-shaped or annular;

[0015] Alternatively, the diagnostic part is provided with a plurality of diagnostic holes, which are arranged in a radial and / or circumferential direction of the connecting part;

[0016] Alternatively, the diagnostic part has a plurality of spaced-apart ribs, the diagnostic part has a through hole, the ribs are located in the through hole and divide the through hole into a plurality of diagnostic holes.

[0017] According to some embodiments of the present application, the cylinder head cover has a first load channel and a second load channel, the crankcase ventilation system further comprises a first one-way valve, a second one-way valve and an air intake module, one end of the first load channel is in communication with the first channel, the other end can be in communication with the air intake module, the first one-way valve is arranged in the first load channel, the second load channel is in communication with the air intake module and is used for conveying gas to the air intake module, and the second one-way valve is arranged in the second load channel; the crankcase ventilation system is configured as:

[0018] When the air intake module is in a negative pressure state, the second one-way valve is opened, and the first one-way valve is closed; when the air intake module is in a positive pressure state, the first one-way valve is opened, and the second one-way valve is closed.

[0019] According to some embodiments of the present application, the crankcase ventilation system further comprises an oil-gas separator, and the air intake module is in communication with the first load channel and the second load channel through the oil-gas separator.

[0020] According to some embodiments of the present application, the crankcase ventilation system further comprises an air intake module, a first one-way valve and a third one-way valve, the cylinder head cover has a gas supplement channel and a first load channel, the first one-way valve is arranged in the first load channel, the third one-way valve is arranged in the gas supplement channel, one end of the gas supplement channel and one end of the first load channel are both in communication with the first channel, and the other ends are both in communication with the air intake module; the crankcase ventilation system is configured as:

[0021] When the air intake module is in a negative pressure state, the third one-way valve is opened, and the first one-way valve is closed; when the air intake module is in a positive pressure state, the first one-way valve is opened, and the third one-way valve is closed.

[0022] According to some embodiments of the present application, the cylinder cover has a gas guide channel, one end of the gas guide channel is communicated with the diagnostic hole, the other end is communicated with the inner cavity of the cylinder cover, the gas guide channel is arranged on the circumferential side of the air supplement channel and the first load channel, the projection formed by the diagnostic hole in the projection plane is staggered with the projection formed by the air supplement channel in the projection plane, and the projection formed by the diagnostic hole in the projection plane is staggered with the projection formed by the first load channel in the projection plane, and the projection plane is perpendicular to the penetrating direction of the diagnostic hole.

[0023] The vehicle according to the second aspect of the present application comprises the crankcase ventilation system according to the first aspect of the present application.

[0024] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0026] Figure 1 FIG. 1 is a schematic view of one embodiment of the crankcase ventilation system of the present application;

[0027] Figure 2 FIG. 2 is a schematic view of one embodiment of the diagnostic assembly of the present application;

[0028] Figure 3 FIG. 3 is a schematic view of another direction of the diagnostic assembly of the present application;

[0029] Figure 4 FIG. 4 is a sectional view of the present application in direction A-A; Figure 2

[0030] FIG. 5 is a schematic view of the connection of one embodiment of the first joint and the second joint of the present application; Figure 5

[0031] FIG. 6 is a schematic view of the gas flow under low load conditions of the present application; Figure 6

[0032] FIG. 7 is a schematic view of the gas flow under high load conditions of the present application; Figure 7

[0033] FIG. 8 is a schematic view of the gas flow when OBD diagnosis is performed under low load conditions of the present application. Figure 8 REFERENCE NUMERALS:

[0034]

[0035] ​Cylinder head cover 100, air guide channel 110, first load channel 120, first one-way valve 121, second load channel 130, second one-way valve 131, air supplement channel 140, third one-way valve 141, air supplement port 142; air filter 200; connection module 300, first connector 310, first channel 311, connection part 312, diagnosis part 313, diagnosis hole 314, protrusion 315, muscle body 316, mounting groove 317, limiting groove 318, second connector 320, plug-in part 321, clamping part 322, second channel 323, sealing element 330; air vent pipeline 400; air inlet module 500; PRV valve 600; oil-gas separator 700; oil return hole 800. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] An embodiment of the utility model provides a kind of crankcase ventilation system (hereinafter referred to as ventilation system), refer to Figure 1 Ventilation system includes cylinder head cover 100, air filter 200, connection module 300 and vent line 400, in an embodiment, ventilation system further includes intake module 500, intake module 500 is not limited to including intake manifold, crankcase, cylinder etc., cylinder is connected to the upper portion of crankcase, intake manifold is connected the cylinder cover of cylinder, and gas is sent into combustion chamber and burns, cylinder head cover 100 is as the cover shell on engine cylinder cover, can cover and seal cylinder cover, to prevent external impurities from entering engine, provide installation base for other parts, and assist crankcase to carry out pressure regulation.

[0042] Air filter 200 can filter the particulate impurities in the exhaust gas discharged by engine operation, ensure that the air entering the engine is pure, and improve fuel efficiency. Vent line 400 is connected between cylinder head cover 100 and air filter 200, vent line 400 can deliver the air filtered by air filter 200 to cylinder head cover 100, and then enter the crankcase through the corresponding channel for air supplement, or deliver the exhaust gas discharged by the engine to air filter 200 for filtration.

[0043] Refer to Figures 2 to 4 Connection module 300 includes first joint 310, second joint 320 and sealing element 330, first joint 310 is connected with cylinder head cover 100, two ends of vent line 400 are connected with second joint 320 and air filter 200 respectively, first joint 310 is provided with first channel 311 communicating with the inner cavity of cylinder head cover 100, after first joint 310 is connected with second joint 320, vent line 400 communicates with the inner cavity of cylinder head cover 100 through first channel 311, the exhaust gas discharged by intake module 500 can be delivered to air filter 200 for filtration and purification through first channel 311 and vent line 400, and the gas at air filter 200 can enter the inside of cylinder head cover 100 through vent line 400 and first channel 311, and air supplement to intake module 500.

[0044] The first joint 310 comprises a connecting portion 312 and a diagnosis portion 313 connected to the periphery of the connecting portion 312, the diagnosis portion 313 is provided with at least one through diagnosis hole 314, the first channel 311 is arranged in the interior of the connecting portion 312, the connecting portion 312 is connected with the second joint 320, so that the first joint 310 is connected with the second joint 320, when the first joint 310 and the second joint 320 are normally connected, the sealing element 330 is clamped between the connecting portion 312 and the second joint 320, one end of the diagnosis hole 314 is in communication with the inner cavity of the cylinder head cover 100, and the other end is blocked by the sealing element 330, so that the ventilation pipeline 400 and the cylinder head cover 100 are sealingly connected.

[0045] When the first joint 310 and the second joint 320 fail to be connected, for example, the first joint 310 and the second joint 320 are loose or even separated, at this time, the connection between the first joint 310 and the second joint 320 is disconnected, the sealing element 330 is no longer clamped by the first joint 310 and the second joint 320, and the diagnosis hole 314 cannot be continuously sealed, the sealing element 330 releases the blocking of the diagnosis hole 314, in this case, external air can enter the interior of the cylinder head cover 100 through the diagnosis hole 314, and then flow to the intake module 500 (such as an intake manifold or a crankcase), and the additional gas flow will cause the intake pressure to fluctuate, and the pressure fluctuation can alarm through the existing control module to realize OBD diagnosis of the ventilation system.

[0046] The ventilation pipeline 400 and the cylinder head cover 100 are connected in gas communication through the connecting module 300, the first joint 310 in the connecting module 300 is provided with the diagnosis hole 314, the sealing element 330 blocks the diagnosis hole 314 in the normal working state, so that the ventilation pipeline 400 and the cylinder head cover 100 are sealingly connected, when the connection between the first joint 310 and the second joint 320 fails, the intake pressure fluctuates and is output to the ECU for diagnosis and code output, the OBD diagnosis is completed by using the structure of the connecting module 300, without additional wire harness connection, so that the structure of the ventilation system is simplified; and compared with the traditional circuit and voltage diagnosis, the pressure detection can reduce the probability of false alarm caused by circuit failure and improve the reliability of OBD diagnosis.

[0047] In an embodiment, the ventilation system further comprises a pressure detection element, which is communicatively connected with the control module. The communication connection is not limited to a wire harness connection, a wireless connection, etc., so that the pressure detection element and the control module can exchange information. The pressure detection element is used to detect the air pressure of the air intake module 500. When the first connector 310 and the second connector 320 fail to be connected, the sealing element 330 unblocks the diagnostic hole 314, and external gas can enter the inside of the cylinder head cover 100 from the diagnostic hole 314 and flow to the air intake module 500, causing the air intake module 500 to fluctuate in pressure. The control module alarms according to the pressure fluctuation detected by the pressure detection element, so as to warn the driver. The control module can be an ECU module of the vehicle or a part of the ECU module. The alarm mode of the control module is not limited to displaying a fault code, displaying a fault icon, playing a fault sound, etc.

[0048] It can be understood that the air intake module 500 of the ventilation system is usually equipped with a pressure detection element. Therefore, the ventilation system in this embodiment can realize OBD diagnosis by using the original pressure detection element, without the need to additionally set a pressure detection device, thereby saving production costs. For example, a pressure sensor is arranged at the intake manifold. The pressure sensor detects the air pressure at the intake manifold. After the first connector 310 and the second connector 320 fail to be connected, external air enters the inside of the cylinder head cover 100, and the air intake module 500 fluctuates in pressure. The air pressure value detected by the pressure sensor exceeds the preset range, indicating that the ventilation system has a running fault, and then the ECU performs diagnosis and code reporting.

[0049] The material of the ventilation pipeline 400 is nylon, polyethylene, etc. For example, the ventilation pipeline 400 is made of glass fiber reinforced nylon material, so that the ventilation pipeline 400 has the characteristics of high and low temperature resistance, impact resistance, and good chemical resistance, and can withstand the high temperature and vibration load of the engine. One end of the second connector 320 is inserted into the ventilation pipeline 400, and the outer wall of the ventilation pipeline 400 tightly fits with the inner wall of the second connector 320, so that the connection part of the two is kept sealed. A clamp or other structure can be arranged outside the ventilation pipeline 400 to strengthen the connection between the ventilation pipeline 400 and the second connector 320.

[0050] The air venting pipeline 400 and the air filter 200 can be connected by a male and female joint, or the air venting pipeline 400 is fixed to the air filter 200, so that the air venting pipeline 400 and the air filter 200 are not detachably connected, and the exemption is realized. In an embodiment, the air venting pipeline 400 and the air filter 200 are connected by two plugs, and the two plugs are fixed to the air venting pipeline 400 and the air filter 200 respectively. One of the plugs is provided with a lock, and after the two plugs are inserted, the lock locks the two plugs, so that the air venting pipeline 400 and the air filter 200 are not detachable; or in another embodiment, the air venting pipeline 400 and the air filter 200 are connected by two plugs, and the two plugs are fixed to the air venting pipeline 400 and the air filter 200 respectively. One of the plugs is provided with a barb, and after the two plugs are inserted, the barb is limited in the direction of insertion and cannot be withdrawn from the other plug, so that the air venting pipeline 400 and the air filter 200 are not detachable.

[0051] It should be noted that the cylinder head cover 100 and the air filter 200 are connected by the air venting pipeline 400, which realizes the gas path conduction between the air filter 200 and the crankcase, and makes the gas path connection between the cylinder head cover 100 and the air filter 200 more flexible, which is convenient for vehicle layout.

[0052] In an embodiment, the first joint 310 is integrally connected with the cylinder head cover 100, for example, the first joint 310 is integrally connected with the cylinder head cover 100 by injection molding; or in another embodiment, the cylinder head cover 100 is provided with a mounting position of the first joint 310, and the first joint 310 is welded to the mounting position of the cylinder head cover 100. It can be understood that the above-mentioned manners can fix the first joint 310 to the cylinder head cover 100, and the first joint 310 is not detachable relative to the cylinder head cover 100, and the exemption is realized.

[0053] Specifically, after the first joint 310 is connected to the cylinder head cover 100, part of the connecting portion 312 protrudes towards the cylinder head cover 100 compared with the diagnosis portion 313, and is inserted into the inside of the cylinder head cover 100, so as to ensure the effective connection between the first joint 310 and the cylinder head cover 100. In addition, the diagnosis portion 313 is embedded in the cylinder head cover 100, and the surface of the diagnosis portion 313 facing the second joint 320 is flush with the surface of the cylinder head cover 100; or, as shown in FIG. 6, the diagnosis portion 313 is embedded in the cylinder head cover 100, and the surface of the diagnosis portion 313 facing the second joint 320 is recessed relative to the surface of the cylinder head cover 100. Figure 5As shown, the diagnostic part 313 is recessed from the surface of the second joint 320 towards the second joint 320 and forms a mounting groove 317, at least part of the sealing member 330 can be embedded in the mounting groove 317, the mounting groove 317 provides a radial limiting action on the sealing member 330; or, the diagnostic part 313 is protruded from the surface of the second joint 320 towards the cylinder head cover 100, so that after the first joint 310 and the second joint 320 are connected, the self-locking buckle on the second joint 320 can be connected to the diagnostic part 313, and the connection between the first joint 310 and the second joint 320 is strengthened; or, the end of the second joint 320 towards the first joint 310 is provided with a limiting groove 318, part of the sealing member 330 is embedded in the limiting groove 318, and part of the sealing member 330 is located outside the limiting groove 318, the inner wall of the limiting groove 318 limits the sealing member 330 in the radial direction, and the two sides of the sealing member 330 are in close contact with the connecting part 312 and the second joint 320, respectively, and are stable between the first joint 310 and the second joint 320.

[0054] It should be noted that, as Figure 1 shown, the cylinder head cover 100 is provided with a gas guide channel 110, one end of the gas guide channel 110 penetrates into the inner cavity of the cylinder head cover 100, and the other end of the gas guide channel 110 communicates with the diagnostic hole 314. When the first joint 310 and the second joint 320 are disconnected, external air enters the inner cavity of the cylinder head cover 100 through the diagnostic hole 314 and the gas guide channel 110, thereby causing the intake air pressure to fluctuate and realizing OBD diagnosis.

[0055] The sealing member 330 is not limited to be made of silicone, fluororubber, nitrile rubber and other oil-resistant and high-temperature-resistant gaskets. The connection mode of the first joint 310 and the second joint 320 is not limited to plug-in, threaded connection and the like. In an embodiment, as Figure 5 shown, the second joint 320 has a plug-in part 321 and a clamping part 322, the clamping part 322 is connected to the peripheral side of the plug-in part 321, the inside of the plug-in part 321 is provided with a second channel 323, part of the plug-in part 321 is protruded from the clamping part 322 towards the first joint 310 and inserted into the connecting part 312, so that the first channel 311 and the second channel 323 are communicated, and the clamping part 322 and the diagnostic part 313 clamp the sealing member 330 together, thereby realizing the connection between the first joint 310 and the second joint 320, and enabling the sealing member 330 to block the diagnostic hole 314.

[0056] In another embodiment, as Figure 4As shown, the connecting portion 312 protrudes backward from the cylinder head cover 100 compared to the diagnostic portion 313, and is inserted into the interior of the second connector 320, so that the second connector 320 is sleeved outside the connecting portion 312, the first channel 311 communicates with the inner cavity of the second connector 320, the air passage 400 communicates with the first channel 311 through the second connector 320, and the end of the second connector 320 clamps the sealing piece 330 together with the diagnostic portion 313, so as to realize the connection of the first connector 310 and the second connector 320, and the sealing piece 330 can block the diagnostic hole 314. In this embodiment, the second connector 320 is directly sleeved outside the first connector 310, and clamps the sealing piece 330 together with the diagnostic portion 313, and the first connector 310 and the second connector 320 are inserted into each other to complete the assembly, so that the connection mode is simple and convenient, and the structure of the connection module 300 is simplified.

[0057] Further, referring to Figure 4 , the outer wall of the connecting portion 312 and / or the inner wall of the second connector 320 is further provided with a protrusion 315, after the connecting portion 312 is inserted into the interior of the second connector 320, the protrusion 315 is clamped between the second connector 320 and the connecting portion 312 in the radial direction, which plays a role in preventing the connecting portion 312 from being pulled out, and strengthens the connection of the first connector 310 and the second connector 320. In addition, a self-locking buckle can also be provided on the second connector 320, after the connecting portion 312 is inserted into the second connector 320, the self-locking buckle is used to lock the connecting portion 312 in the second connector 320, further strengthening the connection of the first connector 310 and the second connector 320.

[0058] In an embodiment, the diagnostic portion 313 is provided in a plurality, and the plurality of diagnostic portions 313 surround the outer periphery of the connecting portion 312, each diagnostic portion 313 is provided with at least one diagnostic hole 314, the sealing piece 330 is annular and is sleeved outside the connecting portion 312, after the first connector 310 and the second connector 320 are connected, each diagnostic portion 313 is in contact with the sealing piece 330, the sealing piece 330 is clamped by the diagnostic portion 313 and the second connector 320 in the entire circumferential direction, and is stable between the diagnostic portion 313 and the second connector 320, and each diagnostic hole 314 is blocked by the sealing piece 330, so that the connection of the first connector 310 and the second connector 320 is kept sealed.

[0059] In another embodiment, the diagnostic portion 313 is annular and is arranged around the side of the connecting portion 312, the sealing piece 330 is annular and is sleeved outside the connecting portion 312, the position of the diagnostic hole 314 on the diagnostic portion 313 is more flexible, and the sealing piece 330 can block the diagnostic hole 314 at any position, and any position of the sealing piece 330 in the circumferential direction can be supported by the diagnostic portion 313 and be stable between the first connector 310 and the second connector 320, so that the connection of the first connector 310 and the second connector 320 is kept sealed.

[0060] The diagnostic hole 314 can be provided as one or more. For example, the diagnostic hole 314 is provided as one, and the diagnostic hole 314 extends along the circumference of the connecting portion 312, so that the diagnostic hole 314 is arc-shaped or ring-shaped. Alternatively, the diagnostic hole 314 is provided as a plurality, and the plurality of diagnostic holes 314 are arranged along the circumference and / or the radial direction of the connecting portion 312.

[0061] In an embodiment, as shown in FIG. 3, the diagnostic portion 313 has a plurality of spaced-apart ribs 316, and the diagnostic portion 313 has a through hole, the ribs 316 are located in the through hole and divide the through hole into a plurality of diagnostic holes 314. The provision of the ribs 316 in the through hole can improve the structural strength of the diagnostic portion 313. After the first joint 310 is connected to the second joint 320, the sealing member 330 is clamped between the diagnostic portion 313 and the second joint 320 and is supported by each rib 316 to be stable between the first joint 310 and the second joint 320. The sealing member 330 can block each diagnostic hole 314, so that the connection between the first joint 310 and the second joint 320 is kept sealed. Figure 3 Further, the ribs 316 are arranged along the radial direction and / or the circumferential direction of the connecting portion 312, so that the diagnostic holes 314 are arranged along the circumferential direction and / or the radial direction of the connecting portion 312. On the one hand, the sealing member 330 can keep the connection between the first joint 310 and the second joint 320 sealed. On the other hand, in the case that the first joint 310 and the second joint 320 are disconnected, external air can enter the inside of the cylinder head cover 100 from different diagnostic holes 314, so that the sensitivity of OBD diagnosis can be improved.

[0062] It should be noted that the diagnostic hole 314 can also be arranged in a certain area of the diagnostic portion 313 according to the arrangement of the gas path in the cylinder head cover 100, so that different gas paths are isolated from each other.

[0063] During engine operation, according to the load condition of the engine, the operating condition of the engine can be divided into a low load condition and a high load condition. When the engine is in the low load condition, the pressure of the intake module 500 (such as an intake manifold, a crankcase) is negative pressure, at this time, gas is introduced into the intake module 500 to balance the pressure of the crankcase. When the engine is in the high load condition, the pressure of the intake module 500 (such as an intake manifold, a crankcase) increases and becomes positive pressure, and gas needs to be discharged to balance the pressure of the crankcase.

[0064]

[0065] ​In an embodiment, the ventilation system comprises a load pipe, two ends of the load pipe are connected with the cylinder head cover 100 and the air filter 200 respectively, and the load pipe and the ventilation pipe 400 can be provided with a one-way valve. When the engine is in a high load working condition, the pressure of the intake module 500 increases and is in a positive pressure state, the one-way valve of the load pipe opens, the one-way valve of the ventilation pipe 400 closes, the gas is discharged through the load pipe and enters the air filter 200 for filtration; when the engine is in a low load working condition, the intake module 500 is in a negative pressure state, the one-way valve of the ventilation pipe 400 opens, the one-way valve of the load pipe closes, and the gas enters the crankcase through the ventilation pipe 400 and the first channel 311 for air supplement. In the low load working condition, if the first joint 310 and the second joint 320 are disconnected, the external air enters the inside of the cylinder head cover 100 through the diagnosis hole 314, the intake module 500 enters additional gas, the intake pressure fluctuates, and the ECU can be outputted for diagnosis code to realize OBD diagnosis.

[0066] In another embodiment, as shown in Figure 1 , the ventilation system comprises a first one-way valve 121 and a second one-way valve 131, the cylinder head cover 100 has a first load channel 120 and a second load channel 130, one end of the first load channel 120 communicates with the first channel 311, and the other end can communicate with the intake module 500, the first one-way valve 121 is arranged in the first load channel 120, the second load channel 130 communicates with the intake module 500 and is used for conveying gas to the intake module 500. As shown in Figure 6 , when the engine is in a low load working condition, the intake module 500 is in a negative pressure state, in this case, the second one-way valve 131 opens, the first one-way valve 121 closes, the gas separated by oil enters the second load channel 130, and then enters the combustion chamber again for combustion and balances the pressure of the crankcase; as shown in Figure 7 , when the engine is in a high load working condition, the intake module 500 is in a positive pressure state, in this case, the first one-way valve 121 opens, the second one-way valve 131 closes, the gas in the crankcase is sequentially discharged into the air filter 200 through the first load channel 120, the first channel 311 and the ventilation pipe 400 for filtration, and the pressure of the crankcase is balanced. As shown in Figure 8 , in the low load working condition, if the first joint 310 and the second joint 320 are disconnected, the external air enters the inside of the cylinder head cover 100 through the diagnosis hole 314, the intake module 500 enters additional gas, the intake pressure fluctuates, and the ECU can be outputted for diagnosis code to realize OBD diagnosis.

[0067] In this embodiment, the first load channel 120 and the second load channel 130 are integrated in the cylinder head cover 100, without the need to arrange a pipe outside the cylinder head cover 100, which can reduce the number of parts of the ventilation system, and the built-in channel can realize exemption.

[0068] As shown in Figure 1 , the ventilation system further comprises a PRV (Pressure Relief Valve) valve 600 for adjusting the crank pressure to realize the ventilation circulation of the crankcase. The PRV valve 600 is integrated in the cylinder head cover 100 and connected with the first load passage 120 and the second load passage 130. When the engine is in a low load working condition, the intake module 500 is in a negative pressure state, and the gas separated from the oil enters the second load passage 130 through the PRV valve 600 and enters the combustion chamber for combustion. When the engine is in a high load working condition, the crank ventilation gas separated from the oil enters the first load passage 120 through the PRV valve 600, and then flows to the air filter 200 through the first passage 311 and the ventilation pipeline 400. The PRV valve 600 can better adjust the crank pressure under different flow rates, so that the ventilation system is suitable for large displacement engines.

[0069] The ventilation system further comprises an oil-gas separator 700. The exhaust gas discharged from the intake module 500 enters the oil-gas separator 700 for oil-gas separation. The oil is retained in the oil storage cavity of the oil-gas separator 700, and the gas further flows and can return to the combustion chamber for combustion.

[0070] In an embodiment, the intake module 500 is connected to the first load passage 120 and the second load passage 130 through the oil-gas separator 700. Therefore, the gas that reenters the combustion chamber for combustion through the second load passage 130 and the gas that is discharged into the air filter 200 through the first load passage 120 are both produced after oil-gas separation through the same oil-gas separator 700. That is, the first load passage 120 and the second load passage 130 share one oil-gas separator 700. The oil-gas separator 700 can be arranged on one side of the cylinder head cover 100, and the arrangement space of the oil-gas separator 700 is more compact. There is no need to set a labyrinth on the intake side and the exhaust side, which saves the machining cost of the cylinder head cover 100. Specifically, the oil-gas separator 700 is connected with the first load passage 120 and the second load passage 130 through the PRV valve 600. The gas separated through the oil-gas separator 700 can be selectively discharged to the air filter 200 through the first load passage 120 or returned to the combustion chamber for combustion through the second load passage 130 after the crank pressure adjustment of the PRV valve 600.

[0071] The side or bottom of the oil-gas separator 700 can be provided with an oil return hole 800 for returning the lubricated oil to the oil sump to complete the circulation of the oil and avoid the accumulation of the oil in the crankcase. An umbrella valve is also provided at the oil return hole 800. The umbrella valve is used to control the oil return flow, prevent the oil from flowing back to other parts of the engine from the oil sump, and prevent external air or impurities from being sucked into the oil return hole and mixed into the oil.

[0072] The cylinder head cover 100 is further provided with a gas supplement passage 140, and the ventilation system further comprises a third one-way valve 141 arranged in the gas supplement passage 140. The gas supplement passage 140 and one end of the first load passage 120 are both in communication with the first passage 311, and the other end of the gas supplement passage 140 and the first load passage 120 are both in communication with the air intake module 500. The gas supplement passage 140 is provided with a gas supplement port 142, and the gas in the gas supplement passage 140 is discharged through the gas supplement port 142 to perform gas supplement. As shown in Figure 6 When the engine is in a low load working condition, the air intake module 500 is in a negative pressure state. In this case, the first one-way valve 121 is closed, and the third one-way valve 141 is opened. The gas enters the gas supplement passage 140 through the ventilation pipeline 400 and the first passage 311, and is supplemented to the crankcase through the gas supplement passage 140 to balance the pressure of the crankcase. As shown in Figure 7 When the engine is in a high load working condition, the air intake module 500 is in a positive pressure state. In this case, the first one-way valve 121 is opened, and the third one-way valve 141 is closed. The gas enters the ventilation pipeline 400 through the first load passage 120 and the first passage 311, and flows to the air filter 200 for filtration. In the embodiment, the gas supplement passage 140 and the first load passage 120 are integrated in the cylinder head cover 100, and no additional pipeline is needed, thereby saving the cost of the pipeline and achieving exemption by embedding the passages in the cylinder head cover 100. Meanwhile, the gas supplement passage 140 and the first load passage 120 share the first passage 311, so that the ventilation system can supplement the gas to the gas supplement passage 140 through the ventilation pipeline 400 in the low load working condition, and discharge the gas into the air filter 200 through the ventilation pipeline 400 in the high load working condition, thereby effectively simplifying the pipeline structure of the ventilation system.

[0073] It should be noted that, in the present application, the first load passage 120, the second load passage 130 and the gas supplement passage 140 are integrated in the cylinder head cover 100 except the ventilation pipeline 400, thereby simplifying the pipeline structure of the ventilation system and achieving exemption. Meanwhile, the ventilation pipeline 400 and the air filter 200 are connected in a non-detachable manner to achieve exemption, the ventilation pipeline 400 and the cylinder head cover 100 are connected through the insertion of the first joint 310 and the second joint 320, which is convenient to operate and can be subjected to OBD diagnosis. The first load passage 120 and the gas supplement passage 140 are both in communication with the ventilation pipeline 400 through the first passage 311, so that the connection module 300 has the functions of OBD diagnosis and conducting the corresponding gas passage in different working conditions, thereby effectively simplifying the pipeline connection of the ventilation system and reducing the number of parts.

[0074] Specifically, referring to Figures 6 to 8When the engine is in high load condition, the pressure of the intake module 500 increases, and is in a positive pressure state. The exhaust gas released in the crankcase is separated by the oil-gas separator 700, and then enters the first load passage 120 through the PRV valve 600. The gas then flows to the air filter 200 through the first passage 311 and the breather line 400 in turn, and is filtered. The filtered gas can enter the combustion chamber again for combustion, realizing the ventilation cycle of the crankcase. When the engine is in low load condition, the intake module 500 is in a negative pressure state. The exhaust gas released in the crankcase is separated by the oil-gas separator 700, and then enters the second load passage 130 through the PRV valve 600, and enters the combustion chamber again for combustion. At the same time, the gas in the breather line 400 enters the crankcase through the first passage 311 and the air supplement passage 140 in turn, to balance the internal pressure of the crankcase. When the engine is in low load condition, if the first joint 310 and the second joint 320 are disconnected, due to the negative pressure state of the intake module 500, external air enters the internal cavity of the cylinder head cover 100 through the diagnosis hole 314, causing fluctuations in the intake pressure, and the ECU diagnoses and reports codes, realizing OBD diagnosis.

[0075] Since the air supplement passage 140 and the first load passage 120 are both in communication with the first passage 311, and the diagnosis hole 314 is in communication with the internal cavity of the cylinder head cover 100 through the air guide passage 110 in the cylinder head cover 100, in order to facilitate the arrangement of the passages and realize the mutual isolation between the passages, and to avoid the gas from moving between different passages, the diagnosis hole 314 is arranged in the preset area of the diagnosis part 313, so that the air guide passage 110, the first load passage 120 and the air supplement passage 140 are staggered with each other. For example, the diagnosis part 313 is provided with a diagnosis area, the diagnosis area is arc-shaped, the diagnosis hole 314 is arranged in the diagnosis area, the air guide passage 110 is provided as a circular hole, and the air guide passage 110, the first load passage 120 and the air supplement passage 140 are arranged side by side and staggered with each other.

[0076] Alternatively, in another embodiment, the gas guide passage 110 is arranged around the side of the air supplement passage 140 and the first load passage 120, the projection of the diagnostic hole 314 formed in the projection plane is staggered with the projection of the air supplement passage 140 formed in the projection plane, and the projection of the diagnostic hole 314 formed in the projection plane is staggered with the projection of the first load passage 120 formed in the projection plane, wherein the projection plane is perpendicular to the through direction of the diagnostic hole 314. On the one hand, the gas guide passage 110 has a large cross-sectional area, and the gas can flow quickly in the gas guide passage 110, when the connection between the first joint 310 and the second joint 320 fails, the external gas flows quickly to the air intake module 500 through the diagnostic hole 314 and the gas guide passage 110, so that the OBD detection is more sensitive, on the other hand, the gas guide passage 110, the air supplement passage 140 and the first load passage 120 are distributed at different positions of the cylinder head cover 100 and are separated from each other, and the gas can flow in the corresponding passages, which is convenient for the position layout of the passages in the cylinder head cover 100.

[0077] The utility model also provides a vehicle, vehicle includes above-mentioned ventilation system, ventilation system can be when engine works, the gas that intruded into crankcase is handled and is introduced into combustion chamber and carries out combustion to protect engine, and maintain the pressure balance in crankcase, simultaneously make vehicle tail gas emission and OBD diagnosis satisfy the requirement.

[0078] It should be noted that the vehicle referred to in the utility model can be a private car, such as a sedan, an SUV, an MPV or a pickup truck. The vehicle can also be a commercial vehicle, such as a minivan, a bus or a truck. The vehicle can be a gasoline vehicle or a hybrid vehicle.

[0079] The embodiments of the utility model have been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A crankcase ventilation system characterized in that, The application relates to a crankcase ventilation system, comprising: a cylinder head cover; an air filter; an intake module, an inner cavity of the cylinder head cover being communicated with the intake module; a connecting module, comprising a first connector, a second connector and a sealing element, the first connector comprising a connecting part and a diagnosis part connected to the periphery of the connecting part, the connecting part being connected with the cylinder head cover, the diagnosis part being provided with at least one diagnosis hole, an inner part of the connecting part being provided with a first channel, the diagnosis hole and the first channel being communicated with the inner cavity of the cylinder head cover, the connecting part being connected with the second connector, the sealing element being clamped between the diagnosis part and the second connector when the first connector and the second connector are normally connected, and the sealing element blocking the diagnosis hole, the sealing element being released from the blocking of the diagnosis hole when the first connector and the second connector are connected abnormally, so that pressure fluctuation of the intake module occurs; an air vent pipeline, two ends of the air vent pipeline being connected with the second connector and the air filter respectively, the air vent pipeline being communicated with the first channel.

2. The crankcase ventilation system according to claim 1, characterized in that The crankcase ventilation system further comprises a pressure detection element and a control module, the pressure detection element being communicated with the control module, the pressure detection element being used for detecting the air pressure of the intake module, and the control module being configured to alarm according to the pressure fluctuation detected by the pressure detection element when the first connector and the second connector are connected abnormally.

3. The crankcase ventilation system according to claim 1, characterized in that The diagnosis part is provided with a plurality of diagnosis parts, and the plurality of diagnosis parts are arranged along the circumference of the connecting part, each diagnosis part being provided with at least one diagnosis hole. Alternatively, the diagnosis part is annular and is arranged around the outer periphery of the connecting part.

4. The crankcase ventilation system according to claim 3, characterized in that The sealing element is annular and is sleeved on the outside of the connecting part.

5. The crankcase ventilation system according to claim 3, characterized in that The diagnosis part is provided with one diagnosis hole, and the diagnosis hole is arc-shaped or annular. Alternatively, the diagnosis part is provided with a plurality of diagnosis holes, and the diagnosis holes are arranged along the radial direction and / or the circumferential direction of the connecting part. Alternatively, the diagnosis part has a plurality of spaced-apart ribs, the diagnosis part has a through hole, the ribs are located in the through hole and divide the through hole into a plurality of diagnosis holes.

6. The crankcase ventilation system according to any one of claims 1 to 5, characterized in that The cylinder head cover has a first load channel and a second load channel, the crankcase ventilation system further comprises a first one-way valve, a second one-way valve and an intake module, one end of the first load channel is communicated with the first channel, the other end of the first load channel can be communicated with the intake module, the first one-way valve is arranged in the first load channel, the second load channel is communicated with the intake module and is used for conveying gas to the intake module, and the second one-way valve is arranged in the second load channel; the crankcase ventilation system is configured as follows: When the intake module is in a negative pressure state, the second one-way valve is opened and the first one-way valve is closed; when the intake module is in a positive pressure state, the first one-way valve is opened and the second one-way valve is closed.

7. - Crankcase ventilation system according to claim 6, characterized in that The crankcase ventilation system further comprises an oil-gas separator, and the intake module is communicated with the first load channel and the second load channel through the oil-gas separator.

8. The crankcase ventilation system according to any one of claims 1 to 5, characterized in that The crankcase ventilation system further comprises an air intake module, a first one-way valve and a third one-way valve, the cylinder head cover has a make-up passage and a first load passage, the first one-way valve is arranged in the first load passage, the third one-way valve is arranged in the make-up passage, one end of the make-up passage and one end of the first load passage are both communicated with the first passage, and the other end of the make-up passage and the other end of the first load passage are both communicated with the air intake module; the crankcase ventilation system is configured to: When the air intake module is in a negative pressure state, the third one-way valve is opened, and the first one-way valve is closed; when the air intake module is in a positive pressure state, the first one-way valve is opened, and the third one-way valve is closed.

9. The crankcase ventilation system according to claim 8, characterized in that The cylinder head cover has a gas guide passage, one end of the gas guide passage is communicated with the diagnostic hole, and the other end of the gas guide passage is communicated with the inner cavity of the cylinder head cover, the gas guide passage is arranged on the side of the make-up passage and the first load passage, the projection of the diagnostic hole formed in the projection plane is staggered with the projection of the make-up passage formed in the projection plane, and the projection of the diagnostic hole formed in the projection plane is staggered with the projection of the first load passage formed in the projection plane, and the projection plane is perpendicular to the penetrating direction of the diagnostic hole.

10. Vehicle, characterized in that The crankcase ventilation system according to any one of claims 1 to 9. The crankcase ventilation system according to any one of claims 1 to 9.

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