Crankcase forced ventilation system, power assembly and vehicle

Abstract

The utility model provides a crankcase forced ventilation system, a power assembly and a vehicle. The crankcase forced ventilation system comprises an air cylinder body, an oil-gas separator, an oil pan, a supercharger, a three-way valve, a fine separator, an air inlet manifold, a first pipeline and an air inlet pipeline. The cylinder body is communicated with the intake manifold, and a gas outlet of the cylinder body is communicated with a gas inlet of the oil-gas separator; the first gas outlet end of the oil-gas separator is communicated with the first gas inlet end of the fine separator, and the oil outlet end of the oil-gas separator is communicated with the oil pan; a pressure regulating valve and a first one-way valve are sequentially communicated in the fine separator; a second air outlet end corresponding to the first one-way valve is communicated with a first end of a three-way valve through a first pipeline; the second end of the three-way valve communicates with the air inlet pipeline, the third end of the three-way valve communicates with the third air outlet end of the supercharger, and a Venturi structure is arranged from the third end to the second end. The air inlet end of the supercharger communicates with the air inlet pipeline, and the air outlet end of the supercharger communicates with the air inlet manifold. Blow-by gas can be eliminated in time, and safety risks or engine oil deterioration risks caused by positive pressure of the crankcase are avoided.

Description

Technical Field

[0001] This application relates to the technical field of engines, and particularly to a positive crankcase ventilation system, a powertrain, and a vehicle. Background Art

[0002] Existing automotive supercharged engines adopt a passive positive crankcase ventilation (PCV) system. When the engine operates in a low-load condition ( Figure 2 in Area A shown), the intake manifold is in a negative pressure state. The pressure between the crankcase and the intake manifold is adjusted through a pressure control valve (PCV) or a pressure relief valve (PRV) to make the crankcase pressure negative; when the engine operates in the supercharging transition area ( Figure 2 in Area B shown) of medium and high load conditions, at this time the intake manifold is in a positive pressure state, and the vacuum degree of the pipeline between the front of the intake end of the supercharger and the outlet end of the air filter is small. Considering the pressure loss of the PCV system under a large blow-by gas volume of the engine, the crankcase pressure in the supercharging transition area is slightly positive; when the engine operates in a large load condition ( Figure 2 in Area C shown), the supercharger intervenes more completely, and the vacuum degree of the pipeline between the front of the intake end of the supercharger and the outlet end of the air filter is large, and the crankcase pressure is still negative.

[0003] When the engine operates in the supercharging transition area, a positive crankcase pressure is not conducive to the discharge of the air-fuel mixture. For a hydrogen fuel engine operating in this supercharging area, the water vapor and hydrogen in the crankcase cannot be discharged in time. When the hydrogen content is between 4% and 76%, an explosion will occur, and there are safety hazards for the vehicle. At the same time, a hybrid-special supercharged engine operating in this condition for a long time is not conducive to the discharge of water vapor and fuel vapor, and there is a risk of deteriorating the engine oil. Content of the Utility Model

[0004] The technical objective to be achieved by the embodiments of this application is to provide a positive crankcase ventilation system, a powertrain, and a vehicle to solve the problem that when the current engine operates in the supercharging transition area, a positive crankcase pressure is not conducive to the discharge of the air-fuel mixture, resulting in safety risks or the risk of deteriorating the engine oil.

[0005] To solve the above technical problems, the embodiments of this application provide a positive crankcase ventilation system, including: a cylinder block, an oil-gas separator, an oil pan, a supercharger, a three-way valve, a fine separator, an intake manifold, a first pipeline, and an intake pipeline;

[0006] Wherein, the cylinder block is communicated with the intake manifold, and the gas outlet of the blow-by gas in the cylinder block is communicated with the intake port of the oil-gas separator;

[0007] The first gas outlet end of the oil-gas separator is communicated with the first gas inlet end of the fine separator, and the oil outlet end of the oil-gas separator is communicated with the oil sump;

[0008] A pressure regulating valve and a first check valve are sequentially arranged in the fine separator. The second gas outlet end corresponding to the first check valve is communicated with the first end of the three-way valve through a first pipeline, and the first check valve is arranged unidirectionally along the direction from the pressure regulating valve to the first pipeline;

[0009] The second end of the three-way valve is communicated with the intake pipeline, and the third end of the three-way valve is communicated with the third gas outlet end of the supercharger. Wherein, a Venturi structure is arranged in the three-way valve along the direction from the third end to the second end;

[0010] The second gas inlet end of the supercharger is communicated with the intake pipeline, and the fourth gas outlet end of the supercharger is communicated with the intake manifold.

[0011] Preferably, the crankcase forced ventilation system as described above further includes: a second pipeline and a second check valve arranged on the second pipeline;

[0012] Wherein, the second pipeline connects the second gas outlet end and the intake pipeline, and the second check valve is arranged unidirectionally along the direction from the second gas outlet end to the intake pipeline.

[0013] Specifically, for the crankcase forced ventilation system as described above, the fine separator further includes: a third check valve and a fourth check valve;

[0014] The third check valve is communicated with the gas outlet of the pressure regulating valve, and the fifth gas outlet end corresponding to the third check valve is communicated with the intake manifold. The third check valve is arranged unidirectionally along the direction from the pressure regulating valve to the intake manifold;

[0015] The fourth check valve is communicated with the gas inlet of the third check valve, and the third gas inlet end corresponding to the fourth check valve is communicated with the first pipeline. The fourth check valve is arranged unidirectionally along the direction from the first pipeline to the third check valve.

[0016] Specifically, for the crankcase forced ventilation system as described above, it further includes: a fifth check valve, and the fifth check valve is arranged between the oil outlet end and the oil sump and is arranged unidirectionally along the direction from the oil outlet end to the oil sump.

[0017] Preferably, the crankcase forced ventilation system as described above further includes:

[0018] An intercooler, and the intercooler is arranged between the fourth gas outlet end of the supercharger and the intake manifold.

[0019] Preferably, the crankcase ventilation system as described above further includes:

[0020] An air filter disposed on the intake pipeline.

[0021] Another embodiment of the present application further provides a powertrain including the crankcase ventilation system as described above.

[0022] Another embodiment of the present application further provides a vehicle including the powertrain as described above.

[0023] Compared with the prior art, the crankcase ventilation system, powertrain, and vehicle provided by the embodiments of the present application have at least the following beneficial effects:

[0024] In the present application, a first pipeline is provided to connect the fine separator and the three-way valve, and both ends of the three-way valve having a Venturi structure are connected to the outlet end of the supercharger and the intake pipeline. When the engine operates in the boost transition region, a vacuum is generated in the three-way valve due to the high-pressure gas from the supercharger passing through the Venturi structure, driving the blow-by gas in the first pipeline and the fine separator to be discharged, circulating through the supercharger to the intake manifold, and further entering the cylinder block to participate in combustion, forming a closed loop, timely exhausting the blow-by gas in the cylinder block, effectively reducing the pressure in the crankcase in the boost transition region to a negative value, ensuring the normal operation of the crankcase, and avoiding the safety risks or oil deterioration risks brought about when the engine operates in the boost transition region. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the crankcase ventilation system of the present application.

[0026] Figure 2 It is a crankcase pressure distribution diagram of the crankcase ventilation system of an automotive supercharged engine in the prior art.

[0027]

Description of the Reference Numerals

[0028] 1, cylinder block; 2, oil and gas separator; 3, oil pan; 4, supercharger; 5, three-way valve; 6, fine separator; 601, pressure regulating valve; 602, first check valve; 603, third check valve; 604, fourth check valve; 7, intake manifold; 8, first pipeline; 9, intake pipeline; 10, second pipeline; 11, second check valve; 12, fifth check valve; 13, intercooler; 14, air filter. Detailed Embodiments

[0029] To make the technical problems, technical solutions, and advantages to be solved by this application clearer, the following will describe in detail with reference to the accompanying drawings and specific embodiments. In the following description, providing specific details such as specific configurations and components is only to help comprehensively understand the embodiments of this application. Therefore, those skilled in the art should clearly understand that various changes and modifications can be made to the embodiments described here without departing from the scope and spirit of this application. Additionally, for clarity and conciseness, descriptions of known functions and structures are omitted.

[0030] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures, or characteristics related to the embodiment are included in at least one embodiment of this application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

[0031] In various embodiments of this application, it should be understood that the magnitudes of the serial numbers of the following processes do not mean the order of execution is prior or subsequent. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0032] It should be understood that the term "and / or" in this text is merely a description of the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0033] In the embodiments provided by this application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0034] See Figure 1 , an embodiment of this application provides a positive crankcase ventilation system, including: a cylinder block 1, an oil-gas separator 2, an oil pan 3, a supercharger 4, a three-way valve 5, a fine separator 6, an intake manifold 7, a first pipeline 8, and an intake pipeline 9;

[0035] Among them, the cylinder block 1 is communicated with the intake manifold 7, and the gas outlet of the blow-by gas in the cylinder block 1 is communicated with the intake port of the oil-gas separator 2;

[0036] The first outlet end of the oil-gas separator 2 is communicated with the first intake end of the fine separator 6, and the oil outlet end of the oil-gas separator 2 is communicated with the oil pan 3;

[0037] A pressure regulating valve 601 and a first one-way valve 602 are sequentially connected in the fine separator 6. The second air outlet corresponding to the first one-way valve 602 is connected to the first end of the three-way valve 5 through a first pipeline 8. The first one-way valve 602 is arranged unidirectionally along the direction from the pressure regulating valve 601 to the first pipeline 8.

[0038] The second end of the three-way valve 5 is connected to an intake pipeline 9, and the third end of the three-way valve 5 is connected to the third air outlet of the supercharger 4. Among them, a Venturi structure is arranged in the three-way valve 5 along the direction from the third end to the second end.

[0039] The second intake end of the supercharger 4 is connected to the intake pipeline 9, and the fourth air outlet of the supercharger 4 is connected to the intake manifold 7.

[0040] The crankcase forced ventilation system provided in this application includes the above-mentioned cylinder block 1, oil-gas separator 2 (which can also be called a rough separator), oil pan 3, supercharger 4, three-way valve 5, fine separator 6, intake manifold 7, first pipeline 8, and intake pipeline 9. Among them, the blow-by gas generated in the cylinder block 1 first passes through the air outlet and the intake port of the oil-gas separator 2 and enters the oil-gas separator 2 for rough separation to separate the mixed gas and liquid. The liquid is output from the oil outlet of the oil-gas separator 2 to the oil pan 3 for recycling. The mixed gas can enter the fine separator 6 through the first air outlet of the oil-gas separator 2 and the first intake end of the fine separator 6. Further, the mixed gas can be transported to the first pipeline 8 through the pressure regulating valve 601 and the first one-way valve 602 in the fine separator 6 (as shown in the direction of the arrow in Figure 1 ).

[0041] The second end of the three-way valve 5 (as shown at B in Figure 1 ) is connected to the intake pipeline 9, and the third end of the three-way valve 5 (as shown at C in Figure 1 ) is connected to the third air outlet of the supercharger 4 (i.e., after the supercharger is supercharged). When the supercharger 4 is in use, the supercharged high-pressure gas can sequentially pass through the third end and the second end of the three-way valve 5. Since a Venturi structure is arranged in the three-way valve 5 along the direction from the third end to the second end, and the first end of the three-way valve 5 (as shown at A in Figure 1 ) is connected to this Venturi structure, when the high-pressure gas passes through, a vacuum will be generated at the first end of the three-way valve 5, thereby draining the mixed gas located in the first pipeline 8, so that the mixed gas passes through the first end and the second end of the three-way valve 5 (as shown in the direction of the arrow in Figure 1 ). Thus, the mixed gas follows the high-pressure gas and air and enters the supercharger 4 again, then enters the intake manifold 7 from the fourth air outlet of the supercharger 4, and further enters the cylinder block 1 to participate in combustion, forming a closed cycle (as shown in Figure 1As shown by the direction of the solid arrow, the blow-by gas in the cylinder block 1 can be discharged in time, which can effectively reduce the pressure in the crankcase in the supercharging transition area (such as area B in Figure 2 ) to a negative value, ensure the normal operation of the crankcase, and avoid the safety risks or the risk of deteriorating engine oil when the engine operates in the supercharging transition area.

[0042] It should be noted that the intake manifold 7 is located in the cylinder head, and the intake manifold 7 is connected to the fine separator 6 through an internal passage provided in the cylinder head cover.

[0043] See Figure 1 , preferably, the crankcase ventilation system as described above further includes: a second pipeline 10 and a second one-way valve 11 provided on the second pipeline 10;

[0044] Wherein, the second pipeline 10 connects the second air outlet end and the intake pipeline 9, and the second one-way valve 11 is arranged unidirectionally along the direction from the second air outlet end to the intake pipeline 9.

[0045] In a specific embodiment of the present application, the crankcase ventilation system further includes: a second pipeline 10 and a second one-way valve 11 provided on the second pipeline 10, wherein the second pipeline 10 connects the second air outlet end corresponding to the first one-way valve 602 and the intake pipeline 9 described above. When the first pipeline 8 and / or the three-way valve 5 cannot be used due to factors such as low temperature (for example, ice blockage occurs when working in a high-cold area), the blow-by gas in the crankcase can communicate with the intake pipeline 9 through the oil-gas separator 2, the fine separator 6, and the second pipeline 10 (as Figure 1 shown by the direction of the solid double arrow in), so that the blow-by gas can enter the intake manifold 7 and the cylinder block 1 driven by the air in the intake pipeline 9 to form a closed cycle. A redundant solution is provided to ensure the normal operation of the engine in harsh environments.

[0046] See Figure 1 , specifically, for the crankcase ventilation system as described above, the fine separator 6 further includes: a third one-way valve 603 and a fourth one-way valve 604;

[0047] The third one-way valve 603 is communicated with the air outlet of the pressure regulating valve 601, and the fifth air outlet end corresponding to the third one-way valve 603 is communicated with the intake manifold 7. The third one-way valve 603 is arranged unidirectionally along the direction from the pressure regulating valve 601 to the intake manifold 7;

[0048] The fourth one-way valve 604 is communicated with the air inlet of the third one-way valve 603, and the third air inlet end corresponding to the fourth one-way valve is communicated with the first pipeline 8. The fourth one-way valve 604 is arranged unidirectionally along the direction from the first pipeline 8 to the third one-way valve 603.

[0049] In another specific embodiment, a third one-way valve 603 is further provided in the fine separator 6. The third one-way valve 603 communicates with the pressure regulating valve 601 and the intake manifold 7. In the low-load condition, since the intake manifold 7 is in negative pressure, the blow-by gas in the crankcase can directly enter the intake manifold 7 through the oil-gas separator 2 and the third one-way valve 603 of the fine separator 6, avoiding the risk brought by the abnormal discharge of the blow-by gas.

[0050] In addition, a fourth one-way valve 604 is further provided in the fine separator 6. The fourth one-way valve 604 communicates with the third one-way valve 603 and the first pipeline 8. In the low-load condition, since the intake manifold 7 is in negative pressure and the supercharger 4 is not started, the air in the intake pipe can enter the intake manifold 7 through the third end of the three-way valve 5, the first end of the three-way valve 5, the first pipeline 8, the fourth one-way valve 604 and the third one-way valve 603 (as Figure 1 shown by the dotted arrow direction in the figure), forming a closed cycle and ensuring the normal operation of the engine under low-load conditions.

[0051] See Figure 1 , specifically, the crankcase ventilation system as described above further includes: a fifth one-way valve 12, and the fifth one-way valve 12 is arranged between the oil outlet end and the oil pan 3 and is arranged unidirectionally along the direction from the oil outlet end to the oil pan 3.

[0052] In another embodiment, the crankcase ventilation system further includes a fifth one-way valve 12. The fifth one-way valve 12 is arranged between the oil outlet end of the oil-gas separator 2 and the oil pan 3, so that the separated liquid can enter the oil pan 3, and the liquid in the oil pan 3 cannot reverse into the oil-gas separator 2 or even the cylinder block 1, which is beneficial to ensuring the safety of the engine.

[0053] See Figure 1 , preferably, the crankcase ventilation system as described above further includes:

[0054] an intercooler 13, and the intercooler 13 is arranged between the fourth air outlet end of the supercharger 4 and the intake manifold 7.

[0055] In a specific embodiment, the crankcase ventilation system further includes an intercooler 13, and the intercooler 13 is arranged between the fourth air outlet end of the supercharger 4 and the intake manifold 7, which can cool the supercharged gas and avoid the influence on the normal use of the engine caused by the too high temperature of the gas entering the intake manifold 7.

[0056] See Figure 1 , preferably, the crankcase ventilation system as described above further includes:

[0057] an air filter 14, and the air filter 14 is arranged on the intake pipeline 9.

[0058] In a specific embodiment, the crankcase forced ventilation system further includes an air filter 14, which is disposed on the intake pipeline 9 and can filter the air to be introduced into the engine, preventing impurities from entering the pipeline and affecting the pipeline or even the engine itself.

[0059] Another embodiment of the present application further provides a powertrain, including: the crankcase forced ventilation system as described above.

[0060] The powertrain provided by the present application includes the crankcase forced ventilation system as described above, which can effectively solve the problem that blow-by gas cannot be discharged when the engine operates in the supercharging transition region, ensure the normal use of the engine, and further facilitate ensuring the normal use of the entire powertrain.

[0061] Another embodiment of the present application further provides a vehicle, including the powertrain as described above.

[0062] The vehicle provided by the present application includes the powertrain as described above, which can further ensure the normal use of the entire vehicle.

[0063] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or arrangements discussed.

[0064] It should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion.

[0065] The above is the preferred embodiment of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle described in the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A positive crankcase ventilation system, characterized in that, Comprising: A cylinder block (1), an oil and gas separator (2), an oil pan (3), a supercharger (4), a three-way valve (5), a fine separator (6), an intake manifold (7), a first pipeline (8), and an intake pipeline (9); Wherein, the cylinder block (1) is in communication with the intake manifold (7), and the gas outlet of the blow-by gas in the cylinder block (1) is in communication with the intake port of the oil and gas separator (2); The first outlet end of the oil and gas separator (2) is in communication with the first intake end of the fine separator (6), and the oil outlet end of the oil and gas separator (2) is in communication with the oil pan (3); A pressure regulating valve (601) and a first one-way valve (602) are sequentially arranged in the fine separator (6) in a communicating manner. The second outlet end corresponding to the first one-way valve (602) is in communication with the first end of the three-way valve (5) through the first pipeline (8). The first one-way valve (602) is arranged in a one-way manner along the direction from the pressure regulating valve (601) to the first pipeline (8); The second end of the three-way valve (5) is in communication with the intake pipeline (9), and the third end of the three-way valve (5) is in communication with the third outlet end of the supercharger (4). Wherein, a Venturi structure is arranged in the three-way valve (5) along the direction from the third end to the second end; The second intake end of the supercharger (4) is in communication with the intake pipeline (9), and the fourth outlet end of the supercharger (4) is in communication with the intake manifold (7).

2. The crankcase forced ventilation system according to claim 1, wherein, Further comprising: A second pipeline (10) and a second one-way valve (11) arranged on the second pipeline (10); Wherein, the second pipeline (10) connects the second outlet end and the intake pipeline (9), and the second one-way valve (11) is arranged in a one-way manner along the direction from the second outlet end to the intake pipeline (9).

3. The crankcase forced ventilation system according to claim 1 or 2, characterized in that, The fine separator (6) further comprises: a third one-way valve (603) and a fourth one-way valve (604); The third one-way valve (603) is in communication with the outlet of the pressure regulating valve (601), and the fifth outlet end corresponding to the third one-way valve (603) is in communication with the intake manifold (7). The third one-way valve (603) is arranged in a one-way manner along the direction from the pressure regulating valve (601) to the intake manifold (7); The fourth one-way valve (604) is in communication with the intake port of the third one-way valve (603), and the third intake end corresponding to the fourth one-way valve is in communication with the first pipeline (8). The fourth one-way valve (604) is arranged in a one-way manner along the direction from the first pipeline (8) to the third one-way valve (603).

4. The crankcase forced ventilation system according to claim 1, wherein Further comprising: A fifth one-way valve (12), which is arranged between the oil outlet end and the oil pan (3) and is arranged in a one-way manner along the direction from the oil outlet end to the oil pan (3).

5. The crankcase forced ventilation system according to claim 1, wherein, Further comprising: An intercooler (13), which is arranged between the fourth outlet end of the supercharger (4) and the intake manifold (7).

6. The crankcase forced ventilation system according to claim 1, wherein Further comprising: An air filter (14), which is arranged on the intake pipeline (9).

7. A powertrain, characterized in that, Comprising: The crankcase forced ventilation system according to any one of claims 1 to 6.

8. A vehicle, characterized in that, Comprising a powertrain as claimed in claim 7.

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