102 results about "Crankcase ventilation system" patented technology

Described herein are engine systems, closed crankcase ventilation systems, and hot filter assemblies that are configured to filter out contaminants from the closed crankcase ventilation system prior to being returned to an air intake of the engine system. In some examples, a closed crankcase ventilation system can include an engine comprising a crankcase, an oil separator coupled to the crankcase, and a hot filter assembly coupled to the oil separator and mounted to an exhaust manifold of the engine or a turbine housing of a turbocharger. The hot filter assembly comprises a housing defining a cavity, a gas inlet fluidly coupled between the oil separator and the cavity, a gas outlet fluidly coupled between the cavity and an air intake of the engine, and at least one baffle extending across the cavity and defining a first and second gas pathways on opposite sides of the baffle.

The utility model discloses an engine and a vehicle, the engine comprises a cylinder body, a timing cavity is formed in the cylinder body, and the cylinder body is provided with an oil pan located below the timing cavity; the cylinder cover and the cylinder body are connected and jointly define an oil return cavity, the oil return cavity is communicated with the timing cavity, an oil return hole is formed in the bottom wall of the oil return cavity, and the oil return hole is communicated with the oil pan; an oil return cavity bottom face distributed around the oil return hole is formed at the bottom of the oil return cavity, an oil return cavity oil weir protruding upwards is arranged on the oil return cavity bottom face, and oil on the inner side wall of the oil return cavity is suitable for flowing to the oil return hole after being shunted by the oil return cavity oil weir. According to the engine, oil storage dead areas can be prevented from being generated at cylinder covers on the two sides, the problem of oil stirring of a timing chain can be solved, the oil gas amount is reduced, the burden of a crankcase ventilation system is reduced, the protruding oil return cavity oil weir is arranged on the bottom face of the oil return cavity, the flow speed of oil in the oil return cavity can be further increased, and the service life of the engine is prolonged. The risk of low engine oil pressure is effectively avoided, and it is guaranteed that the whole machine has good lubricating performance.

The invention discloses a crankcase ventilation system, an engine and a vehicle. The crankcase ventilation system comprises a cylinder head cover, a ventilation device and a ventilation device, and the venturi structure is internally arranged and integrated in the cylinder head cover. According to the crankcase ventilation system, the Venturi structure is internally arranged and integrated in the cylinder head cover, and a plurality of pipelines and parts related to the Venturi structure and the cylinder head cover can also be integrated in the cylinder head cover, so that the pipelines can be saved, the space of an engine is saved, the number of parts of the engine is reduced, and the structure is simplified; the engine cost is reduced. Besides, due to the fact that a plurality of pipelines are integrated in the cylinder head cover, aging of the pipelines due to long-term use is avoided, the problems that an external pipe is prone to high-temperature aging and falling off are solved, waste gas leakage is avoided, and sealing performance is enhanced.

The invention relates to a closed engine crankcase ventilation system, a vehicle and a control method, and relates to the technical field of engine component design, the closed engine crankcase ventilation system comprises a first oil-gas separator used for being arranged on a cylinder head cover and driven by supercharged air, and the air inlet end of the first oil-gas separator is used for stretching into the cylinder head cover; the air outlet end is used for communicating with an engine air inlet pipe, and the oil outlet end is used for communicating with an oil pan so as to suck gas in the cylinder head cover, convey the gas to the engine air inlet pipe after oil-gas separation and convey oil to the oil pan; the second oil-gas separator is used for being arranged on an engine cylinder body and driven by circulating press oil in the engine cylinder body, the gas inlet end of the second oil-gas separator is used for communicating with the engine cylinder body, the gas outlet end of the second oil-gas separator is used for communicating with an engine gas inlet pipe, and the oil outlet end of the second oil-gas separator is used for communicating with an oil pan so as to suck gas in the engine cylinder body; and after oil-gas separation, gas is conveyed to an engine gas inlet pipe, and oil liquid is conveyed to an oil pan.

Internal combustion engine with a crankcase ventilation system (23), comprising a crankcase (17), an intake air line (2), wherein the intake air line (2) comprises a throttle valve (6) and an air filter (8), as well as with a crankcase ventilation line (4) for ventilating the crankcase (17) and a crankcase ventilation line (3) for flushing the crankcase (17), wherein the crankcase ventilation line (4) is arranged at a first connection point (13, 70) downstream of the air filter (8) to the intake air line (2), characterized in that a sensor unit (18) is arranged in the crankcase ventilation line (3) downstream of a first flow influencing device (7) and upstream of a first backflow prevention device (26), wherein the first connection point (13, 70) is spaced downstream from a crankcase ventilation line connection (28) is arranged on the intake air line (2),so that a malfunction of the crankcase ventilation system (23) can be detected by the sensor unit (18).

This disclosure provides a "system and method for diagnosing intake oxygen sensors." A method and system are provided for diagnosing whether one or more intake oxygen sensors located in the intake port of an engine of a vehicle are functioning as expected. In one example, a method includes: injecting fuel into one or more cylinders of the engine without combustion; directing unburned hydrocarbons from the one or more cylinders to the intake port via a crankcase ventilation system; and indicating whether the one or more intake oxygen sensors are functioning as expected based on their responses. In this way, the one or more intake oxygen sensors can be diagnosed periodically, which can improve engine operation and reduce engine degradation, particularly for hybrid electric vehicles with limited engine operating time.

The utility model relates to an oil return one-way valve of a crankcase ventilation system, which comprises a valve casing and a valve seat, the inside of the valve casing is communicated with the inside of the valve seat, the valve casing comprises a first valve casing and a second valve casing which are in assembled connection, the second valve casing is movably connected with the valve seat, a valve cavity is arranged in the valve casing, a diaphragm is arranged in the valve cavity, and the diaphragm is arranged in the valve casing. The second valve shell is used for blocking fluid when being attached to the first valve shell in a sealed mode, and supporting ribs are arranged in the second valve shell and used for forming a flow channel for the fluid to pass through. The diaphragm type one-way valve core is adopted, so that the diaphragm can freely move in the valve cavity, the position of the diaphragm is continuously changed in the closing process each time to be in contact with the first valve shell, the stress positions of the surface of the diaphragm and the contact surface of the second valve shell are different when the diaphragm is closed each time, and therefore deformation caused by local continuous stress cannot be caused; the service life of the diaphragm is effectively prolonged, opening is kept through the dead weight of the diaphragm and the dead weight of engine oil, and backflow smoothness can be improved when blow-by pressure is small.

The invention discloses a crankcase ventilation system, a control method and a vehicle, relates to the technical field of engines, and can reduce engine oil emulsification and improve engine reliability. The crankcase ventilation system comprises a crankcase, the crankcase comprises a crankshaft cavity and an oil storage cavity, and the crankshaft cavity is communicated between an engine air cylinder and the oil storage cavity; the air inlet channel is provided with an air inlet manifold, and the air outlet end of the air inlet manifold communicates with an air inlet valve of the engine. The air inlet end of the first exhaust channel is communicated with the crankshaft cavity, the air outlet end of the first exhaust channel comprises a first sub-end and a second sub-end, and the first sub-end is communicated with the first air inlet end of the air inlet manifold; the air inlet end of the second exhaust channel is communicated with the second sub-end, the air outlet end of the second exhaust channel is communicated with the second air inlet end of the air inlet manifold, the first exhaust channel is provided with a first one-way valve, and the second exhaust channel is provided with a second one-way valve.

A rotating crankcase ventilation system comprises a housing comprising an inlet and an outlet, a motor comprising a stator and a rotor, and a shaft. A first end of the shaft is coupled to the rotor and configured to rotate in response to rotation of the rotor. A filter element is coupled to the shaft. A sensor is configured to measure at least one operating parameter of the rotating crankcase ventilation system. A controller is operatively coupled to the sensor and the motor, the controller configured to receive the at least one operating parameter and selectively adjust operation of the motor to adjust rotation of the rotor, and thereby, the filter element based on the at least one operating parameter.

The anti-icing crankcase ventilation system comprises a crankcase ventilation air outlet pipe, and the crankcase ventilation air outlet pipe comprises an air outlet pipe shell, a copper pipe, a steel wire mesh assembly and a filter membrane assembly; the air outlet pipe shell is composed of two end portions and a middle portion, the inner cavity diameter of the middle portion is larger than that of the two end portions, the copper pipe is fixed to the inner cavity of the middle portion, the two ends of the copper pipe are connected with the two end portions respectively, and the outer diameter of the copper pipe is smaller than the inner diameter of the middle portion. The steel wire mesh assembly and the filter membrane assembly are sequentially clamped to the inner wall of the copper pipe in the airflow direction. The crankcase ventilation air outlet pipe assembly is designed in a modularized mode, crankcase gas is liquefied, the water content in the crankcase gas is greatly reduced through the hydrophobic nanometer coating technology, the problem of freezing of a crankcase ventilation system is fundamentally solved, and compared with a heating scheme, the crankcase ventilation air outlet pipe assembly is more simplified in structure, better in effect and higher in cost performance.

The invention relates to the technical field of engines, and provides a crankcase ventilation system and method for an ammonia-hydrogen engine. The system comprises an energy supply structure which communicates with an engine through a pipeline and is used for conveying fuel to the engine to serve as an energy source for operation of the engine; the gas supply structure communicates with the engine through a pipeline and is used for conveying a combustion-supporting gas source to the engine; the engine is provided with a sensing assembly electrically connected with the control unit; and the blow-by gas treatment structure communicates with a crankcase of the engine and the gas supply structure through pipelines and is used for separating impurities in blow-by gas in the crankcase and supplementing the separated blow-by gas back to the gas supply structure to participate in gas inlet circulation under the regulation and control of the control unit. According to the device, engine oil steam, water vapor and ammonia gas in blow-by gas of the crankcase can be separated, so that the problem of engine oil emulsification in the crankcase is solved, and meanwhile, the safety problem possibly caused by high-concentration enrichment of the ammonia gas is avoided.

The invention discloses a vehicle control method, device and equipment and a medium, and the method comprises the steps: responding to a power-on instruction of a hybrid vehicle, and obtaining the actual environment temperature of the environment where the hybrid vehicle is located; under the condition that the actual environment temperature is smaller than the preset environment temperature, whether the accumulative running duration of the hybrid vehicle and the accumulative running duration of an engine of the hybrid vehicle meet a first preset condition or not is judged, and / or whether the accumulative stop duration of the engine meets a second preset condition or not is judged; and under the condition that the first preset condition and / or the second preset condition are / is met and the actual vehicle speed of the hybrid vehicle is larger than 0, the engine is controlled to operate. Volatilization of water vapor and gasoline vapor in engine oil is accelerated, the water vapor and the gasoline vapor are introduced into the engine through the crankcase ventilation system to participate in combustion and discharged out of the engine, finally moisture and gasoline in the engine oil are reduced, the performance deterioration condition of the engine oil caused by chemical reaction of the moisture and the gasoline is relieved, and the service life of the engine oil is prolonged.

The utility model discloses a crankcase ventilation system, an engine and a vehicle, and relates to the technical field of crankcase ventilation, the crankcase ventilation system is applied to the engine, the engine comprises a cylinder head cover and a crankcase, and the crankcase ventilation system comprises an oil-gas separator arranged on one side of the cylinder head cover; the first pre-separation structure is arranged between the oil-gas separator and the cylinder head cover, the first pre-separation structure is provided with a gas inlet, a gas outlet and a backflow port, the gas inlet is connected with the cylinder head cover, the gas outlet is connected with the oil-gas separator, and the backflow port is connected with the crankcase. According to the technical scheme, the technical problem that an oil-gas separator in an existing crankcase ventilation system is prone to breaking down is solved.

The utility model provides a crankcase ventilation system and a vehicle. The crankcase ventilation system comprises an air cylinder body and a crankcase which are connected up and down. The air inlet unit and the exhaust unit are respectively communicated with the air cylinder body, and the exhaust unit comprises a three-way catalyst; the crankcase communicates with the air inlet unit through an air supplementing pipeline. The gas inlet end of the oil-gas separation unit is communicated with the crankcase, and the gas outlet end of the oil-gas separation unit is communicated with the gas inlet unit or the three-way catalyst of the gas outlet unit. According to the arrangement of the gas supplementing pipeline and the trend design of the gas at the exhaust end of the oil-gas separation unit, hydrogen in the crankcase can be actively swept away so that the hydrogen concentration can be controlled within a reasonable range, and the ventilation effect of the crankcase can be guaranteed.

The utility model discloses a crankcase ventilation system, an engine and a vehicle, the crankcase ventilation system comprises an air inlet pipeline and a first exhaust pipeline, the air inlet pipeline comprises a turbocharger, a throttle valve and an air inlet manifold which are sequentially connected through pipelines, and the first exhaust pipeline comprises an oil-gas separator and a Venturi tube; a contraction section of the venturi tube is communicated with the air inlet end of the throttle valve, a diffusion section of the venturi tube is communicated with the air inlet end of the turbocharger, a throat portion of the venturi tube is communicated with the oil-gas separator, and a first valve is further arranged between the contraction section of the venturi tube and the air inlet end of the throttle valve. The first valve is used for collecting the opening degree of the throttle valve, the first valve judges the working condition of the engine by collecting the opening degree information of the throttle valve, whether gas can circulate in the venturi tube or not is controlled, and the reliability and stability of rapid exhaust of the ventilation system of the crankcase are improved.

The present application discloses a crankcase ventilation system and a vehicle, belonging to the field of vehicle technology. The crankcase ventilation system includes a crankcase, a first ventilation line, a second ventilation line and an air supply line; the two ends of the first ventilation line are respectively connected to the crankcase and the intake manifold of the engine, and a first valve is arranged on the first ventilation line; the two ends of the second ventilation line are respectively connected to the crankcase and the intake line of the supercharger, and a second valve is arranged on the second ventilation line; the two ends of the air supply line are respectively connected to the crankcase, the intake line between the throttle and the supercharger, and a third valve is arranged on the air supply line. The present application reduces the influence of exhaust gas on the engine oil in the crankcase and increases the service life of the engine oil.

The invention relates to a separator (10) for separating a liquid from a gas stream, in particular for separating oil from blow-by gas in a crankcase ventilation system (200), having at least one nozzle carrier element (102) with at least one nozzle assembly (104) with at least one nozzle (106, 108), and having an impingement element (110) arranged at least partially downstream with respect to the nozzle assembly (104), characterized in that a permanent cover device (120, 122, 124, 126) is provided for one or more nozzles (108) of the nozzle assembly (104), which cover device reduces the throughflow of the gas stream through the one or more nozzles (108) by at least 50% compared to a nozzle (106) without the cover device (120, 122, 124, 126). Furthermore, the invention relates to a fitting kit for a separator (10).

The invention discloses a hydrogen internal combustion engine crankcase ventilation system and a crankcase ventilation control method, and relates to the field of hydrogen internal combustion engines, the hydrogen internal combustion engine crankcase ventilation system comprises a first ventilation pipeline communicated with a supercharger and a first end of a four-way valve, a second ventilation pipeline communicated with an air filter and a second end of the four-way valve, and a third ventilation pipeline communicated with an air storage tank and a third end of the four-way valve, when the water content of the crankcase is larger than the upper limit threshold value of the water content, the opening degree of a first flow adjusting valve in the first ventilation pipeline is controlled to be larger than the opening degree of a third flow adjusting valve in the third ventilation pipeline, and the opening degree of the third flow adjusting valve is controlled to be larger than the opening degree of a second flow adjusting valve in the second ventilation pipeline. Based on the size relation of the opening degrees of the flow regulating valves, the proportion of the dry gas output by the supercharger and the gas storage tank in the mixed gas when the water content of the crankcase is larger than the upper limit threshold value of the water content is increased, the flow speed of the mixed gas is increased, and the inhibition effect on hydrogen detonation and engine oil emulsification phenomena is improved.

The invention provides a plug-in hybrid crankcase ventilation system monitoring method and system, and the method comprises the steps: obtaining operation basic data, and judging whether a crankcase forced ventilation system fault diagnosis physical condition is satisfied or not according to the operation basic data; in response to the fact that the crankcase forced ventilation system fault diagnosis physical condition is met, whether an oil cut-off condition is triggered or not is judged; in response to the triggering fuel cut condition, the engine management system and the vehicle control unit are coordinated and controlled to enter a fuel cut working condition, and whether a diagnosis enabling condition is met or not is judged; and in response to the fact that the diagnosis enabling condition is met, the actual air inlet pressure of the air inlet manifold is obtained, and whether the crankcase ventilation system breaks down or not is judged according to the actual air inlet pressure and a preset fault threshold value. The method constructs a rigorous diagnosis environment through three-layer condition screening, adapts to the working condition of the insertion-mixing vehicle type, is instant and accurate in diagnosis, and has innovativeness and engineering application value.

The invention discloses an engine and a vehicle, and the engine comprises a cylinder body, a timing cavity is formed in the cylinder body, and the cylinder body is provided with an oil pan; a first oil return cavity is defined by the first cylinder cover and the cylinder body, a second oil return cavity is defined by the second cylinder cover and the cylinder body, the first oil return cavity is provided with a first oil return hole communicated with the oil pan, and the second oil return cavity is provided with a second oil return hole communicated with the oil pan; a first inner drainage wall is formed in the first oil return cavity and obliquely arranged towards the first oil return hole from top to bottom, and a second inner drainage wall is formed in the second oil return cavity and obliquely arranged towards the second oil return hole from top to bottom. The inclination angle of the second inner drainage wall relative to the horizontal direction is larger than that of the first inner drainage wall relative to the horizontal direction. According to the engine, oil accumulation areas can be prevented from being generated on the two cylinder covers, oil stirring of the timing chain is prevented, and the oil gas amount is reduced so that the burden of a crankcase ventilation system can be reduced.

A system includes an engine block in blowby gas receiving communication with one or more cylinders and a crankcase ventilation system configured to draw a fluid out of the engine block and separate the fluid into separated crankcase blowby gas and a liquid. The fluid includes the blowby gas. The crankcase ventilation system includes a first crankcase ventilation conduit configured to route the separated crankcase blowby gas to the one or more cylinders. The system includes a controller configured to perform operations including causing the crankcase ventilation system to draw the fluid out of the engine block at a determined purge air flow rate.

The invention discloses equipment and a method for measuring the engine oil carrying capacity of an engine crankcase ventilation system, relates to the technical field of measuring devices, and aims to improve the measuring precision of the engine oil carrying capacity of an engine. The measuring equipment comprises a collecting device provided with a base and an upper cover which are connected in a sealing manner, and an accommodating cavity is formed between the base and the upper cover; a containing cavity is formed in the base, a filter element framework which is connected with the base and provided with filter holes is arranged in the containing cavity and divides the containing cavity into a first cavity body and a second cavity body, the upper cover is connected with an inlet pipe communicating the first cavity body with the atmosphere and an outlet pipe communicating the second cavity body with the atmosphere, the first cavity body is filled with oil absorption sponge, and the second cavity body is filled with oil absorption sponge. And the inlet pipe is connected with a ventilation outlet of the crankcase. According to the device and method for measuring the engine oil carrying amount of the engine crankcase ventilation system, the engine oil carrying amount of the engine can be accurately measured on the premise that the permeability of the crankcase ventilation system is not affected.

A crankcase ventilation system comprising a housing and a filter element assembly rotatably coupled to the housing. The filter element assembly comprises a first endcap, a second endcap spaced apart from the first endcap, a filter media pack coupled to the first endcap at a first end of the filter media pack and the second endcap at a second end of the filter media pack, and a seal member sealingly engaging the second endcap with the filter media pack along an outer perimeter region of the filter media pack. The filter media pack defines a plurality of axial flow channels extending between the first end and the second end.

The utility model discloses a crankcase ventilation system and an automobile, the crankcase ventilation system comprises a curved through pipe assembly and an oil-gas separator, the oil-gas separator is provided with a low-pressure channel, the curved through pipe assembly comprises a double-layer curved through pipe, the double-layer curved through pipe comprises an outer pipe and an inner pipe, an outer-layer channel is defined between the inner wall of the outer pipe and the outer wall of the inner pipe, and the outer-layer channel is communicated with the outer-layer channel. An inner layer channel is defined by the inner wall of the inner pipe; one end of the first connector is connected with one end of the double-layer bent through pipe, the other end of the first connector is connected with the oil-gas separator, and the first connector is configured to communicate the outer-layer channel with the low-pressure channel of the oil-gas separator so that the outer-layer channel can be in a low-negative-pressure state. According to the application, when the double-layer bent through pipe cracks and leaks, as the outer-layer channel is negative pressure relative to the atmospheric pressure, only external gas can be sucked into the pipe, abnormity is monitored, pollutants containing oil gas in the pipe cannot leak to the external environment, and the environment is prevented from being polluted.

The utility model provides an engine crankcase ventilation system. The engine crankcase ventilation system comprises a cylinder head cover, a cooling and filtering assembly and a pressure adjusting assembly. The cooling filter assembly comprises a baffle and at least two metal filter screens, the baffle and the cylinder head cover are combined to form a cooling circulation channel, an inlet is formed in one end of the cooling circulation channel, and all the metal filter screens are located at the other end of the cooling circulation channel; the pressure regulating assembly is used for discharging oil steam filtered by the metal filter screen and comprises a pressure relief boss, a pressure relief structure and an exhaust pipe, the side portion of the pressure relief boss communicates with the exhaust pipe, a pressure relief opening is formed in the top of the pressure relief boss, the pressure relief structure is movably connected with the top of the pressure relief boss, and the pressure relief structure is used for blocking or opening the pressure relief opening. The pressure relief boss is provided with an air inlet hole used for air inflow. By means of the engine oil filtering device, the filtering efficiency can be improved, the engine oil loss amount is reduced, and the problem that oil leaks from multiple positions due to the fact that the internal pressure of an engine is too large can be solved.

The invention relates to a jet pump for oil drainage in a crankcase ventilation system of an internal combustion engine, comprising - an inlet opening 3 for supplying oil from an oil separator of the internal combustion engine, - a propulsion nozzle 5 for supplying a propellant medium, - an outlet opening 6 for returning the oil to a cylinder head chamber 7 of the internal combustion engine, - a check valve 8 arranged at the inlet opening 3 to prevent backflow of oil, - wherein the check valve is designed as a diaphragm valve 8.

The invention belongs to the technical field of engines, and particularly relates to an oil-gas separator and a crankcase ventilation system.The crankcase ventilation system comprises a supercharger, a Venturi tube, the oil-gas separator, an intake manifold and a crankcase. A filtering mechanism and five breather valves are integrated in the oil-gas separator, and the communication state of the Venturi tube, the oil-gas separator, the crankcase and the intake manifold is controlled through the five breather valves, so that the path of mixed gas in the crankcase flowing into the combustion chamber is controlled. Compared with the prior art, the number of external pipelines is reduced, and the integration level of the ventilation system is improved. Particularly, when the ventilation system is in a low-load working condition, air flows into the crankcase after flowing through the ventilation pipeline, the Venturi tube and the oil-gas separator, only one path is provided for the air to flow into the crankcase, and the problem of airflow turbulence can be solved.

The flange joint comprises an upper main body and a lower main body which are connected with each other, and one end of the lower main body is provided with a male plug externally connected with a pipeline; a partition plate and a valve plate which are coaxial with the upper main body are radially arranged at the other end of the lower main body, after the upper main body is connected with the lower main body, the partition plate is axially locked between the upper main body and the lower main body, and a jacking block is arranged on the axial inner side of the upper main body and used for jacking and limiting the axial middle of the valve plate and the partition plate; a through hole corresponding to the valve plate is axially formed in the partition plate so that the through hole can be opened and closed through the valve plate. According to the utility model, the circular valve plate is integrally arranged in the flange joint, and the overall volume is much smaller than that of a split structure, so that the integrated flange joint can be directly assembled in a crankcase ventilation system after being integrally produced, the volume of a crankcase ventilation pipeline can be smaller, the space in a vehicle is effectively saved, and the service life of the crankcase ventilation pipeline is prolonged. And the cost of molds and pipelines can be reduced, so that the cost of the whole vehicle is reduced.

The invention discloses an anti-icing engine crankcase ventilation system which is installed on an engine and comprises an oil-gas separator, a blow-by channel, an air inlet pipe and an air outlet pipe, the engine comprises an air cylinder body, a cylinder cover, an exhaust pipe and a supercharger, the cylinder cover is installed above the air cylinder body, and the exhaust pipe is installed above the air cylinder body. The exhaust pipe is installed on the cylinder cover, and the supercharger is further installed in the middle of the exhaust pipe. At least one longitudinally-arranged blow-by channel is further arranged on the crankcase exhaust side of the air cylinder body. The upper end of the blow-by channel is sealed, and a gas taking opening is formed in the side surface of the upper part; the oil-gas separator is installed on the exhaust side of the air cylinder body, one end of an air inlet pipe of the oil-gas separator is connected with the blow-by channel, oil gas in the crankcase is led into the oil-gas separator, and an air outlet pipe is connected with the air inlet end of the supercharger. The working temperature of the gas outlet pipe of the oil-gas separator ranges from 30 DEG C to 70 DEG C under the high and cold environment, and the risk that a pipeline of a crankcase ventilation system is frozen and blocked is avoided.

The utility model provides a crankcase ventilation system, an engine and a vehicle, and relates to the field of crankcase ventilation systems. An adjusting assembly is arranged at the air outlet end of the crankcase and specifically comprises a vacuum pump and a pressure sensor arranged in the crankcase, and electromagnetic bypass valves in communication connection or electric connection with the pressure sensor are arranged at the two ends of the vacuum pump in parallel. Thus, the pressure value in the crankcase can be monitored in real time through the pressure sensor, when the measured pressure value does not conform to the preset pressure range, the opening degree of the electromagnetic bypass valve can be correspondingly adjusted, and the working state of the adjusting assembly can be correspondingly changed; therefore, the pressure of the crankcase can be correspondingly adjusted to rise or fall to a preset range through the adjusting assembly. In this way, the pressure value in the crankcase can be adjusted in real time without a complex structure, and it is ensured that the crankcase can maintain the stable negative pressure state under all working conditions.