CN218235205U - Crankcase ventilation system, engine and vehicle - Google Patents

Abstract

The utility model discloses a crankcase ventilation system, engine and vehicle, crankcase ventilation system includes: an air filter having a first outlet; the mixing valve is provided with an input end and an output end, and the negative pressure of the output end is greater than that of the input end; the air inlet assembly is connected with the output end and is used for supplying air to a combustion chamber of the engine; the first outlet is communicated with the input end through the first gas pipe, and the first gas pipe is provided with a first branch port; a crankshaft ventilation system having a blow-by gas outlet end; and the blow-by gas outlet end is communicated with the first branch port through the first vent pipe. Blow-by gas that has oil gas in the crankcase can let in first gas-supply pipe through first breather pipe, then discharges the subassembly that admits air, and final burning is got rid of, and the negative pressure of mixing valve output is greater than the negative pressure of mixing valve input moreover, can avoid the fluid in the crankcase to enter into first gas-supply pipe like this, reduces the fluid loss in the crankcase.

Description

Crankcase ventilation system, engine and vehicle

Technical Field

The utility model belongs to the technical field of the vehicle technique and specifically relates to a crankcase ventilation system, engine and vehicle are related to.

Background

In the related art, a crankcase ventilation system includes a crankcase, a cylinder head cover, a breather valve, an intake manifold, and an air filter, the crankcase, the cylinder head cover, the breather valve, and the intake manifold are sequentially communicated, the air filter is communicated with the crankcase through a first pipeline, and the air filter is used for supplying fresh air to the crankcase through the first pipeline and also supplying fresh air to the cylinder head cover through a second pipeline in a low-load working stage.

Currently, the crankcase is typically in direct communication with the supercharger; however, the negative pressure at the air inlet end of the supercharger is larger, and the negative pressure of the crankcase is smaller, so that oil in the crankcase is easy to suck out, and the oil in the crankcase is lost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a crankcase ventilation system, this crankcase ventilation system can reduce the fluid loss in the crankcase.

The utility model discloses an engine is further proposed.

The utility model discloses a vehicle is still further provided.

According to the utility model discloses a crankcase ventilation system, include: an air filter having a first outlet; a mixing valve having an input end and an output end, the negative pressure at the output end being greater than the negative pressure at the input end; the air inlet assembly is connected with the output end and is used for supplying air to a combustion chamber of the engine; the first outlet is communicated with the input end through the first gas pipe, and the first gas pipe is provided with a first branch port; a crankshaft ventilation system having a blow-by gas outlet end; and the blow-by gas outlet end is communicated with the first branch port through the first vent pipe.

According to the utility model discloses a crankcase ventilation system, the blowby gas that has oil gas in the crankcase can let in first gas-supply pipe through first breather pipe, mix with fresh air and form the mist, then arrange the subassembly that admits air, finally can burn and get rid of, and the blowby gas exit end passes through first breather pipe intercommunication with first branch mouth, the negative pressure of mixing valve output is greater than the negative pressure of mixing valve input, can avoid first breather pipe and first branch mouth junction negative pressure too big and make the fluid in the crankcase also enter into first gas-supply pipe like this, finally by the burning, thereby can reduce the fluid loss in the crankcase.

In some examples of the invention, the crankcase ventilation system further comprises: the breather valve is provided with an air inlet valve port and a first air outlet valve port, the air inlet valve port is communicated with the blowby outlet end, and the first air outlet valve port is communicated with the first branch port through the first breather pipe.

In some examples of the present invention, the air intake assembly includes a supercharger, an intercooler, and an air intake manifold connected in sequence by a pipeline, and the output end is communicated with the inside of the supercharger; the crankcase ventilation system further comprises: the second breather pipe is provided with a second air outlet valve port which is communicated with the inside of the intercooler through the second breather pipe; when the pressure of the intake manifold is higher than the pressure of the crankshaft ventilation system, the intake valve port is communicated with the first outlet valve port, and the intake valve port is disconnected with the second outlet valve port; when the pressure of the intake manifold is smaller than the pressure of the crankshaft ventilation system, the intake valve port is communicated with the second outlet valve port, and the intake valve port is disconnected with the first outlet valve port.

In some examples of the present invention, the intake assembly further includes a throttle valve disposed at an inlet of the intercooler.

In some examples of the invention, the crankcase ventilation system further comprises: an exhaust gas circulation valve and a booster pipe; the output end is communicated with the supercharger through the supercharging pipe, the supercharging pipe is provided with a second branch port, and an outlet of the exhaust gas circulation valve is communicated with the second branch port through a pipeline.

In some examples of the present invention, the first outlet valve port is located above the first branch port, such that oil and gas flows downstream from the first outlet valve port to the first branch port by gravity; and/or the second air outlet valve port is positioned above the inlet of the intercooler, so that the oil gas flows from the second air outlet valve port to the inlet of the intercooler in a downstream mode under the action of gravity.

In some examples of the invention, the first vent pipe cover is provided with a thermal insulation sleeve.

In some examples of the invention, the crankcase ventilation system further comprises: the air filter comprises a second air pipe and an air supply one-way valve, wherein the air supply one-way valve is arranged in the crankshaft ventilation system, and is communicated with the air filter through the second air pipe.

According to the utility model discloses an engine, include: the crankcase ventilation system described above.

According to the utility model discloses a vehicle, include: the engine described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a first angle of a crankcase ventilation system according to an embodiment of the invention;

FIG. 2 is a schematic view of a second angle of a crankcase ventilation system according to an embodiment of the invention;

fig. 3 is a schematic diagram of a connection of a crankcase ventilation system according to an embodiment of the invention.

Reference numerals are as follows:

1. a crankcase ventilation system;

10. a crankcase; 20. an air intake assembly; 21. a supercharger; 22. an intercooler; 23. an intake manifold; 24. a throttle valve; 30. an air filter; 31. a first gas pipe; 40. a mixing valve; 50. a first breather pipe; 60. a vent valve; 70. a timing cover; 71. an oil-gas separation device; 80. a second vent pipe; 90. an exhaust gas recirculation valve; 100. a cylinder head cover; 110. air supply one-way valve.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A crankcase ventilation system 1 according to an embodiment of the invention is described below with reference to fig. 1-3, the crankcase ventilation system 1 being adapted to discharge blow-by gas from a crankcase 10.

As shown in fig. 1-3, a crankcase ventilation system 1 according to an embodiment of the invention comprises: a crank ventilation system, an air intake assembly 20, an air filter 30, a mixing valve 40, a first air inlet conduit 31 and a first air outlet conduit 50. The air filter 30 filters the air to introduce fresh air, and the air filter 30 has a first outlet from which the air filtered by the air filter 30 can be discharged. The mixing valve 40 may function as an open and close control to control the passage of the mixed gas, the mixing valve 40 having an input end and an output end, the gas entering the mixing valve 40 from the input end and exiting from the output end. The intake assembly 20 may be used for intake and for supplying air to a combustion chamber of an engine, into which a mixture containing oil and gas may be introduced for combustion. The crankshaft ventilation system includes: the crankcase 10, the crankcase 10 can be used for installing a crankshaft, and oil is arranged in the crankcase 10. While the first vent conduit 50 may function as a communication vent.

As shown in fig. 3, the first outlet is connected to the first air pipe 31, the input end is also connected to the first air pipe 31, so that the first outlet and the input end can be communicated through the first air pipe, the air intake assembly 20 is connected to the output end, the crankshaft ventilation system has a blow-by outlet end, that is, the crankcase 10 has a blow-by outlet end, the blow-by outlet end is communicated with the first branch port through the first breather pipe 50, that is, the fresh air filtered by the air filter 30 is firstly led to the mixing valve 40 through the first air pipe 31, and meanwhile, the blow-by gas with oil gas in the crankcase 10 is also led to the first air pipe 31, the fresh air and the blow-by gas with oil gas are mixed in the first air pipe 31 to form a mixed gas, and then led to the air intake assembly 20 through the mixing valve 40, and finally led to the combustion chamber for combustion.

Wherein the negative pressure at the output of the mixing valve 40 is greater than the negative pressure at the input of the mixing valve 40. It should be noted that, the output end of the mixing valve 40 is the end of the mixed gas after passing through the mixing valve 40, and is generally connected to the pressure booster 21, a relatively large negative pressure is formed at the inlet of the pressure booster 21, so that the negative pressure at the output end of the mixing valve 40 is greater than the negative pressure at the input end of the mixing valve 40, the end of the mixing valve 40 before the mixed gas enters the mixing valve 40, that is, the first gas pipe 31, the output end of the mixing valve 40 is connected to the gas inlet end of the pressure booster 21, the negative pressure at the gas inlet end of the pressure booster 21 is relatively large, and can reach 15kPa, so that the negative pressure at the output end of the mixing valve 40 is also relatively large, and the negative pressure at the input end of the mixing valve 40, that is, about 5kPa or less, and the negative pressure at the first gas pipe 31 of the crankcase 10 is generally less than 5kPa, so that, after the blow-by gas in the crankcase 10 passes through the first branch port, if the first branch port is located between the mixing valve 40 and the intake assembly 20, that is at the output end of the mixing valve 40, then the negative pressure at the connection of the first branch port, the first gas in the crankcase 50, which a relatively large amount of the gas in the crankcase 10 is lost, and a large amount of oil contained in the oil is discharged, and burned, and the oil is relatively large, so that the oil is discharged, and the oil is relatively large.

From this, the blowby gas that has oil gas in the crankcase 10 can let in first air-supply pipe 31 through first breather pipe 50, mix in mixing valve 40 department with fresh air and form the mist, then discharge to air admission subassembly 20, finally can burn and get rid of, and the blowby gas exit end passes through first breather pipe 50 with first branch mouth and communicates, the negative pressure of mixing valve 40 output is greater than the negative pressure of mixing valve 40 input, can avoid first breather pipe 50 and first branch mouth junction negative pressure too big and make the fluid in the crankcase 10 also enter into first air-supply pipe 31 like this, finally by the burning, thereby can reduce the fluid loss in the crankcase 10.

Of course, as shown in fig. 1-3, the crankcase ventilation system 1 further comprises: and a breather valve 60, the breather valve 60 having an inlet valve port communicating with the blow-by gas outlet port and a first outlet valve port communicating with the first branch port through a first breather pipe 50. The breather valve 60 may function to control the amount of blow-by, with the intake valve port communicating with the blow-by outlet port, such that the breather valve 60 communicates with the crankcase 10, and further, the crankshaft ventilation system may further include: the timing cover 70, the crankcase 10 and the timing cover 70 are communicated, an oil-gas separation device 71 is installed inside the timing cover 70, the oil-gas separation device can separate oil gas in blow-by gas as much as possible, oil liquid loss in the crankcase 10 is reduced, the oil-gas separation device 71 is communicated with a breather valve 60 installed outside the timing cover 70, specifically, blow-by gas flows out of the crankcase 10 firstly, then enters the timing cover 70, and then enters the breather valve 60 through the oil-gas separation device 71. The first air outlet valve port is communicated with the first branch port through the first breather pipe 50, and it should be noted that, when the pressure of the intake assembly 20 is greater than the pressure of the crankcase 10, the breather valve 60 selects the crankcase 10 to be communicated with the first breather pipe 50, and the blow-by gas with oil gas in the crankcase 10 is introduced into the first air pipe 31 through the first breather pipe 50 to be mixed with the fresh air. In addition, the vent valve 60 is a three-way diaphragm valve, so that the fresh air released from the air filter 30 can be blocked by the vent valve 60 from entering the crankcase 10 through the first breather pipe 50 and the vent valve 60. In this way, the blow-by gas of the crankcase 10 can be discharged more reasonably, and the crankcase ventilation system 1 can be made to operate normally.

Note that, as shown in fig. 1 to 3, the intake assembly 20 includes a supercharger 21, an intercooler 22, and an intake manifold 23, which are connected in this order by pipes.

Wherein the crankcase ventilation system 1 further comprises: the second vent pipe 80, the vent valve 60 has a second outlet port, one end of the second vent pipe 80 is connected to the second outlet port, and the other end of the second vent pipe 80 is connected to the intercooler 22, that is, the second outlet port is communicated with the inside of the intercooler 22 through the second vent pipe 80. When the pressure of the intake manifold 23 is less than the pressure of the crankshaft ventilation system, the intake valve port and the second outlet valve port are connected, and the intake valve port and the first outlet valve port are disconnected.

That is, the ventilation load of the second breather pipe 80 is smaller than the ventilation load of the first breather pipe 50, one end of the second breather pipe 80 is connected to the ventilation valve 60, the other end of the second breather pipe 80 is connected to the intake assembly 20, when the pressure of the intake manifold 23 is greater than the pressure of the crankcase 10, because the ventilation load of the second breather pipe 80 is smaller than the ventilation load of the first breather pipe 50, the ventilation valve 60 selects the crankcase 10 to be communicated with the first breather pipe 50, the crankcase 10 is disconnected from the second breather pipe 80, blow-by gas with oil and gas in the crankcase 10 is introduced into the intake manifold 23 through the first breather pipe 50 and then introduced into the combustion chamber for combustion, when the pressure of the intake manifold 23 is smaller than the pressure of the crankcase 10, the ventilation valve 60 selects the crankcase 10 to be communicated with the second breather pipe 80, the crankcase 10 is disconnected from the first breather pipe 50, and blow-by gas with oil and gas in the crankcase 10 is introduced into the intake manifold 23 and then introduced into the combustion chamber for combustion. Also, the breather valve 60 may prevent gas in the intake assembly 20 from entering the crankcase 10 through the second breather tube 80 and the breather valve 60 at positive pressure. In this way, the blow-by gas of the crankcase 10 can be discharged more reasonably, and the crankcase ventilation system 1 can be made to operate normally.

It should be noted that, the two ends of the first vent pipe 50 and the second vent pipe 80 are both provided with the quick-connect connectors, the conventional quick-connect connectors are added with an OBD (vehicle-mounted self-diagnosis system) diagnosis sensor and a wire harness, but the first vent pipe 50 and the second vent pipe 80 are troublesome in disassembly, maintenance or replacement, and in the scheme, the quick-connect connectors can be disassembled by using special tools, so that the OBD diagnosis regulation requirements are met, and the first vent pipe 50 and the second vent pipe 80 can be disassembled, so that the operation is more convenient and faster, and the disassembly cost is reduced.

Specifically, as shown in fig. 1 to fig. 3, the intercooler 22 is connected between the supercharger 21 and the intake manifold 23, the intercooler 22 is mainly a turbocharged kit, the output end of the intercooler is communicated with the inside of the supercharger 21, the supercharger 21 can supercharge and heat the mixture, the intercooler 22 is mainly used for reducing the temperature of the high-temperature supercharged mixture to reduce the heat load of the engine and increase the intake air amount, and further increase the power of the engine, the intake manifold 23 is communicated with the combustion chamber, and the mixture can be introduced into the combustion chamber after passing through the intake manifold 23, so that the blow-by gas in the crankcase 10 can be removed. The other end of the second vent pipe 80 is communicated with the intercooler 22, so that the blow-by gas with oil gas passing through the second vent pipe 80 can enter the intercooler 22 for cooling treatment, and the blow-by gas with oil gas can be mixed with fresh air introduced by the air filter 30 in the intercooler 22 and then introduced into the intake manifold 23, so that the mixing time between gases is longer, the mixed gas entering a combustion chamber is mixed more uniformly, and the combustion can be more sufficient.

Optionally, as shown in fig. 1 and 3, the crankcase ventilation system 1 further comprises: the output end of the exhaust gas circulation valve 90 is communicated with the supercharger 21 through the supercharger, a second branch port is arranged on the supercharger, the outlet of the exhaust gas circulation valve 90 is communicated with the second branch port through a pipeline, that is, the exhaust gas circulation valve 90 is connected with the supercharger 21 through the supercharger, and the mixing valve 40 is connected between the exhaust gas circulation valve 90 and the supercharger 21. The exhaust gas recirculation valve 90 is mainly used for controlling the introduction of exhaust gas, which generally contains oil gas. The exhaust gas circulating valve 90 is connected with the supercharger 21, and the mixing valve 40 is connected between the exhaust gas circulating valve 90 and the supercharger 21, that is, after the mixed gas passes through the mixing valve 40, the exhaust gas can be mixed with the mixed gas again through the exhaust gas circulating valve 90, so that the proportion of oil gas in the mixed gas can be increased, the mixing degree of the oil gas and fresh air can be improved, and the mixed gas can be fully combusted. Of course, the exhaust gas recirculation valve 90 can also adjust the amount of the entering exhaust gas to ensure that the amount of oil gas in the mixed gas is in a proper range.

Further, as shown in fig. 1 to 3, the intake assembly 20 further includes: and a throttle valve 24, the throttle valve 24 being provided at an inlet of the intercooler 22. That is to say, still be provided with throttle 24 between booster 21 and intercooler 22, throttle 24 can control the volume of air-fuel mixture, on the one hand, can control the volume that air-fuel mixture gets into air intake manifold 23 as required to can better carry out the processing of burning, promote the combustion efficiency, reduce the oil consumption, on the other hand, with the demand volume control of air-fuel mixture in less scope, also can control in less scope to the cooling capacity of air-fuel mixture like this, thereby can reduce intercooler 22's volume, reduce cost.

According to an optional embodiment of the present invention, as shown in fig. 1, the first outlet valve port is located above the first branch port, so that the oil gas flows downstream to the first branch port from the first outlet valve port by gravity, and/or the second outlet valve port is located above the inlet of the intercooler 22, so that the oil gas flows downstream to the inlet of the intercooler 22 from the second outlet valve port by gravity. The first air outlet valve port is located on the vent valve 60, the first branch port is located on the first air conveying pipe 31, and the first air outlet valve port is located above the first branch port, so that the vent valve 60 is the highest point, oil gas can flow downstream to the first branch port from the first air outlet valve port through the action of gravity, and the oil gas in the first air vent pipe 50 is prevented from forming liquid when meeting cold in a cold environment, flowing back to the first air outlet valve port and freezing, so that the situation that the pressure of the crankcase 10 is too high due to the blockage of the vent valve 60 can be avoided. Similarly, the second air outlet valve port is located on the breather valve 60, and the second air outlet valve port is located above the inlet of the intercooler 22, so that the position of the breather valve 60 is the highest point, the oil gas can flow downstream to the inlet of the intercooler 22 from the position of the second air outlet valve port through the action of gravity, and the oil gas in the second breather pipe 80 is prevented from forming liquid when being cooled under a cold environment, flowing back to the position of the second air outlet valve port and freezing, so that the over-high pressure of the crankcase 10 caused by the blockage of the breather valve 60 can be avoided.

In addition, the first air pipe 50 is fitted with a heat insulating jacket. Also can be equipped with the insulation cover on first breather pipe 50, the insulation cover can play heat retaining effect, can avoid the oil gas in first breather pipe 50 to meet cold formation liquid under chilly environment like this to can avoid first breather pipe 50 and breather valve 60's junction to freeze and cause the jam, of course, also can be equipped with the insulation cover at second breather pipe 80 cover. The thickness range of the heat preservation sleeve is as follows: 3mm-5mm.

In addition to that, as shown in fig. 1-3, the crankcase ventilation system 1 comprises: a second air pipe and an air supplying one-way valve 110, wherein the air supplying one-way valve 110 is arranged on the crankshaft ventilation system, and the air supplying one-way valve 110 is communicated with the air filter 30 through the second air pipe. Tonifying qi check valve 110 and empty filter 30 pass through the second air-conveying pipe intercommunication, and when ventilating to air admission subassembly 20 by second breather pipe 80, empty filter 30 can the tonifying qi check valve 110 let in fresh air, and crankshaft ventilation system still includes: the cylinder head cover 100 and the air make-up check valve 110 are disposed on the cylinder head cover 100, and the cylinder head cover 100 is communicated with the crankcase 10, so that fresh air can be introduced into the crankcase 10, and thus fresh air can form an air flow in the crankcase 10, so that blow-by gas in the crankcase 10 can be exhausted together to the greatest extent, and good ventilation in the crankcase 10 is ensured, and high negative pressure cannot be generated in the crankcase 10. Further, the make-up check valve 110 is a check valve, so that the blow-by gas in the crankcase 10 is prevented from being discharged into the air cleaner 30.

According to the utility model discloses engine, include: the crankcase ventilation system 1 described in the above embodiment.

According to the utility model discloses vehicle, include: the engine described in the above embodiment.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact via another feature therebetween. In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A crankcase ventilation system, comprising:

an air filter having a first outlet;

a mixing valve having an input end and an output end, the negative pressure at the output end being greater than the negative pressure at the input end;

the air inlet assembly is connected with the output end and is used for supplying air to a combustion chamber of the engine;

the first outlet is communicated with the input end through the first gas pipe, and the first gas pipe is provided with a first branch port;

a crankshaft ventilation system having a blow-by gas outlet end;

a first breather pipe through which the blow-by gas outlet end communicates with the first branch port.

2. The crankcase ventilation system of claim 1, further comprising: the breather valve is provided with an air inlet valve port and a first air outlet valve port, the air inlet valve port is communicated with the blowby outlet end, and the first air outlet valve port is communicated with the first branch port through the first breather pipe.

3. The crankcase ventilation system of claim 2, wherein the intake assembly includes a supercharger, an intercooler, and an intake manifold connected in sequence by conduits, the output communicating with the supercharger;

the crankcase ventilation system further comprises: the second breather pipe is provided with a second air outlet valve port which is communicated with the inside of the intercooler through the second breather pipe;

when the pressure of the intake manifold is higher than the pressure of the crankshaft ventilation system, the intake valve port is communicated with the first outlet valve port, and the intake valve port is disconnected with the second outlet valve port;

when the pressure of the intake manifold is smaller than the pressure of the crankshaft ventilation system, the intake valve port is communicated with the second outlet valve port, and the intake valve port is disconnected with the first outlet valve port.

4. The crankcase ventilation system of claim 3, wherein the air intake assembly further comprises a throttle valve disposed at an inlet of the intercooler.

5. The crankcase ventilation system of claim 3, further comprising: an exhaust gas circulation valve and a booster pipe;

the output end is communicated with the supercharger through the supercharging pipe, a second branch port is arranged on the supercharging pipe, and an outlet of the exhaust gas circulation valve is communicated with the second branch port through a pipeline.

6. The crankcase ventilation system of claim 3, wherein the first outlet port is positioned above the first branch port such that air flows by gravity downstream from the first outlet port to the first branch port; and/or

The second air outlet valve port is positioned above the inlet of the intercooler, so that the oil gas flows downstream from the second air outlet valve port to the inlet of the intercooler under the action of gravity.

7. The crankcase ventilation system of claim 1, wherein the first breather tube is jacketed with a thermal jacket.

8. The crankcase ventilation system of claim 1, further comprising: the air filter comprises a second air pipe and an air supply one-way valve, wherein the air supply one-way valve is arranged in the crankshaft ventilation system, and is communicated with the air filter through the second air pipe.

9. An engine, comprising: the crankcase ventilation system according to any one of claims 1-8.

10. A vehicle, characterized by comprising: an engine as claimed in claim 9.

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