Engine ventilation system, engine and vehicle

Abstract

The utility model belongs to the technical field of engines, and particularly relates to an engine ventilation system, an engine and a vehicle. The engine ventilation system comprises an air taking pipe, an air outlet pipe and an adjusting valve, and the air taking pipe and the air outlet pipe are both communicated with a crankcase of an engine; the end, away from the crankcase, of the gas taking pipe communicates with an exhaust pipe of an engine. The adjusting valve is installed in the exhaust pipe and used for adjusting the flow of gas flowing into the gas taking pipe from the exhaust pipe. According to the engine ventilation system, waste gas of the engine is used for purging hydrogen in the crankcase, the supercharging capacity of the air inlet side of the engine is not sacrificed, and the combustion efficiency of the engine is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of engine, in particular, be related to an engine ventilation system, engine and vehicle. BACKGROUND

[0002] Hydrogen as a clean energy, get more and more extensive application. Hydrogen as fuel in the combustion chamber of engine combustion, because the piston can not completely seal the combustion chamber, the hydrogen in the combustion chamber will inevitably be into the crankcase, the hydrogen concentration in the crankcase is higher when there is a higher safety accident.

[0003] In the prior art, the purge system of the crankcase is usually to introduce the gas in the intake pipe of the engine into the crankcase. However, using the gas in the intake pipe of the engine to purge the hydrogen in the crankcase will reduce the gas entering the combustion chamber, and further lose the supercharging capacity of the engine, resulting in the problem of insufficient air amount of the engine under heavy load. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a kind of engine ventilation system, engine and vehicle to solve the technical problem that the hydrogen in the crankcase is purged by the gas in the intake pipe of the engine in the prior art will lose the supercharging capacity of the engine.

[0005] To solve the above problems, the first embodiment of the utility model provides an engine ventilation system, comprising a gas taking pipe, a gas outlet pipe and a regulating valve, the gas taking pipe and the gas outlet pipe are both communicated with the crankcase of the engine.

[0006] One end of the gas taking pipe away from the crankcase is communicated with the exhaust pipe of the engine. The regulating valve is installed in the exhaust pipe, and is used to adjust the gas flow rate of the exhaust pipe flowing into the gas taking pipe.

[0007] Optionally, the engine ventilation system further comprises an oil-gas separator. One end of the gas outlet pipe away from the crankcase is communicated with the inlet of the oil-gas separator. The oil outlet of the oil-gas separator is communicated with the oil gallery of the engine. The gas outlet of the oil-gas separator is communicated with the exhaust pipe.

[0008] Optionally, the engine ventilation system further comprises a proportional valve. The gas outlet of the oil-gas separator is communicated with the inlet of the proportional valve. The first outlet of the proportional valve is communicated with the exhaust pipe. The second outlet of the proportional valve is communicated with the intake pipe of the engine.

[0009] Optionally, the engine ventilation system further comprises a drying assembly installed in the gas taking pipe. The drying assembly is used to dry the gas in the gas taking pipe.

[0010] Optionally, the engine ventilation system further comprises a hydrogen concentration sensor extending into the crankcase, the hydrogen concentration sensor being configured to detect a hydrogen concentration in the crankcase.

[0011] Optionally, the engine ventilation system further comprises a controller electrically connected to the hydrogen concentration sensor and the regulating valve.

[0012] Optionally, the engine ventilation system further comprises a gas extraction sensor installed in the gas outlet pipe, the gas extraction sensor being configured to detect a gas pressure or flow rate in the gas extraction pipe.

[0013] The second embodiment of the utility model provides an engine, comprising an engine body, an air inlet pipe, an air outlet pipe and the above-mentioned engine ventilation system;The engine body is equipped with a crankcase and a combustion chamber, the air inlet pipe and the air outlet pipe all communicate with the combustion chamber.

[0014] The third embodiment of the utility model provides a vehicle comprising the above-mentioned engine.

[0015] In the utility model, the gas extraction pipe and the gas outlet pipe all communicate with the crankcase of the engine;The end of the gas extraction pipe away from the crankcase communicates with the air outlet pipe of the engine;The regulating valve is installed in the air outlet pipe and is configured to regulate the gas flow rate in the air outlet pipe flowing into the gas extraction pipe.The exhaust gas in the combustion chamber of the engine is discharged through the air outlet pipe, the exhaust gas in the air outlet pipe can be input into the crankcase through the gas extraction pipe, the gas output by the gas extraction pipe can purge the gas in the crankcase, and the gas in the crankcase is discharged through the gas outlet pipe, which reduces the hydrogen concentration in the crankcase and ensures the safety of the engine.

[0016] In addition, the amount of gas input into the crankcase through the gas extraction pipe can be regulated by the regulating valve according to the hydrogen concentration in the crankcase, the regulating valve can regulate the opening degree of the air outlet pipe, thereby changing the exhaust back pressure in the air outlet pipe and further regulating the gas flow rate in the air outlet pipe flowing into the gas extraction pipe.In the utility model, the engine ventilation system uses the exhaust gas of the engine to purge the hydrogen in the crankcase, without sacrificing the supercharging capacity of the air inlet side of the engine, and ensures the combustion efficiency of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model is further illustrated below in combination with the drawings and embodiments.

[0018] Figure 1 The utility model provides an engine ventilation system for an embodiment of the utility model.

[0019] The reference signs in the specification are as follows:

[0020] 1, intake pipe; 2, exhaust pipe; 3, regulating valve; 4, oil-gas separator; 5, proportional valve; 6, drying assembly; 7, hydrogen concentration sensor; 8, engine body; 81, crankcase; 82, combustion chamber; 83, exhaust pipe; 84, intake pipe. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model.

[0022] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0023] As shown in Figure 1 The utility model provides a kind of engine ventilation system provided by first embodiment of the utility model, including intake pipe 1, exhaust pipe 2 and regulating valve 3, the intake pipe 1 and the exhaust pipe 2 are all communicated with the crankcase 81 of engine;It can be understood that, the crankshaft of engine is installed in the crankcase 81.Further explanation, the crankshaft of engine is installed in the internal space of the crankcase 81.

[0024] The end of the intake pipe 1 away from the crankcase 81 is communicated with the exhaust pipe 83 of engine;The regulating valve 3 is installed in the exhaust pipe 83, and is used to adjust the gas flow rate of the exhaust pipe 83 flowing into the intake pipe 1.It can be understood that, the combustion chamber 82 of engine is communicated with the exhaust pipe 83, and the gas in the combustion chamber 82 can be discharged through the exhaust pipe 83;Along the flow direction of gas in the exhaust pipe 83, the regulating valve 3 is located behind the communication place of the intake pipe 1 and the exhaust pipe 83;The regulating valve 3 can adjust the opening degree of the exhaust pipe 83, so as to change the exhaust back pressure in the exhaust pipe 83, and then adjust the gas flow rate of the exhaust pipe 83 flowing into the intake pipe 1.Further explanation, when the opening degree of the regulating valve 3 increases, the exhaust back pressure in the exhaust pipe 83 is smaller, and the gas flow rate flowing into the intake pipe 1 will decrease.

[0025] The utility model discloses a take gas pipe 1 and the gas outlet pipe 2 all intercommunication engine's crankcase 81, the take gas pipe 1 is away from the one end intercommunication engine's exhaust pipe 83 of crankcase 81, the regulating valve 3 is installed in exhaust pipe 83, and it is used for adjusting the gas flow of exhaust pipe 83 inflow take gas pipe 1. The exhaust gas in engine combustion chamber 82 is discharged through exhaust pipe 83, and the exhaust gas in exhaust pipe 83 can be input into crankcase 81 through take gas pipe 1, and the gas output by take gas pipe 1 can purge the gas in crankcase 81, and the gas in crankcase 81 is discharged through gas outlet pipe 2, reduces the hydrogen concentration in crankcase 81, guarantees the security of engine.

[0026] In addition, the hydrogen concentration in the crankcase 81 can be adjusted by the regulating valve 3 to adjust the amount of gas input into the crankcase 81 by the take gas pipe 1, and the regulating valve 3 can adjust the opening size of the exhaust pipe 83, thereby changing the exhaust back pressure in the exhaust pipe 83, and further adjusting the gas flow of the exhaust pipe 83 into the take gas pipe 1. In the utility model, the engine ventilation system uses the exhaust gas of the engine to purge the hydrogen in the crankcase 81, without sacrificing the supercharging capacity of the engine intake side, ensuring the combustion efficiency of the engine.

[0027] In an embodiment, as shown in Figure 1 The gas outlet pipe 2 is connected to the oil and gas separator 4, and the oil outlet of the oil and gas separator 4 is connected to the oil channel of the engine, and the gas outlet of the oil and gas separator 4 is connected to the exhaust pipe 83. It can be understood that the gas in the gas outlet pipe 2 is input into the oil and gas separator 4, the oil and gas separator 4 can separate the gas and oil, the oil separated by the oil and gas separator 4 can flow into the oil channel (oil pan) of the engine, and the gas separated by the oil and gas separator 4 can be input into the rear end of the exhaust pipe 83 and finally discharged through the exhaust pipe 83. In this embodiment, the design of the oil and gas separator 4 avoids the direct discharge of gasoline in the engine by the gas outlet pipe 2, so that the oil in the gas of the gas outlet pipe 2 can flow back to the oil channel of the engine, reducing the oil consumption of the engine.

[0028] In an embodiment, as shown in Figure 1As shown, the engine ventilation system further comprises a proportional valve 5, the gas outlet of the oil-gas separator 4 is connected to the inlet of the proportional valve 5, the first outlet of the proportional valve 5 is connected to the exhaust pipe 83, and the second outlet of the proportional valve 5 is connected to the air inlet pipe 84 of the engine. It can be understood that the proportional valve 5 can adjust the amount of gas flowing into the exhaust pipe 83 and the air inlet pipe 84. In this embodiment, part of the gas separated by the oil-gas separator 4 flows into the exhaust pipe 83 through the proportional valve 5, and the other part of the gas flows into the air inlet pipe 84 through the proportional valve 5, and then flows back to the engine combustion chamber 82 through the air inlet pipe 84, thereby increasing the EGR (Exhaust Gas Recirculation Rate) of the engine. In addition, the oil-gas separator 4 can return the separated oil to the oil gallery of the engine, avoiding the oil entering the engine combustion chamber 82 through the proportional valve 5 and the air inlet pipe 84, thereby avoiding abnormal combustion phenomena such as induced early combustion and knocking in the engine combustion chamber 82.

[0029] In an embodiment, as shown in Figure 1 As shown, the engine ventilation system further comprises a drying assembly 6 installed in the gas extraction pipe 1, which is used to dry the gas in the gas extraction pipe 1. It can be understood that the drying assembly 6 can remove the moisture in the gas, ensuring the dryness of the gas output from the gas extraction pipe 1 to the crankcase 81, and preventing the engine from experiencing oil dilution accidents.

[0030] In an embodiment, as shown in Figure 1 As shown, the engine ventilation system further comprises a hydrogen concentration sensor 7 extending into the crankcase 81, which is used to detect the hydrogen concentration in the crankcase 81. It can be understood that the hydrogen concentration sensor 7 can detect the hydrogen concentration in the crankcase 81 in real time, and the regulating valve 3 can adjust the amount of gas output from the gas extraction pipe 1 to the crankcase 81 according to the hydrogen concentration detected by the hydrogen concentration sensor 7, thereby ensuring the purging efficiency of the engine ventilation system for the gas in the crankcase 81.

[0031] In a specific implementation, when the engine is working, the hydrogen concentration sensor 7 detects the hydrogen concentration in the crankcase 81 in real time. If the hydrogen concentration is less than 3%, the regulating valve 3 is fully opened. After the gas in the crankcase 81 is purged, it flows out of the oil-gas separator 4 through the gas outlet pipe 2. A small amount of oil separated by the oil-gas separator 4 flows back to the oil gallery of the engine, and the separated gas is divided into two parts by the proportional valve 5. One part of the gas flows into the exhaust pipe 83 and is discharged, and the other part of the gas flows back to the air inlet pipe 84 and finally enters the combustion chamber 82 of the engine.

[0032] When the hydrogen concentration sensor 7 detects an increase in the hydrogen concentration in the crankcase 81, the opening degree of the regulating valve 3 is reduced, at which time the amount of gas flowing into the gas extraction pipe 1 is increased, so that the gas extraction pipe 1 extracts the amount of gas in the crankcase 81 is also increased, the purging efficiency of the crankcase 81 is increased, and the hydrogen concentration in the crankcase 81 is rapidly reduced.

[0033] In an embodiment, the engine ventilation system further comprises a controller (not shown in the figure) which is electrically connected with the hydrogen concentration sensor 7 and the regulating valve 3. Understandably, the controller can be a control panel or the like on the vehicle, and the controller can adjust the amount of gas output by the gas extraction pipe 1 into the crankcase 81 through the regulating valve 3 according to the hydrogen concentration detected by the hydrogen concentration sensor 7. In this embodiment, the design of the controller improves the degree of automation of the engine ventilation system.

[0034] Further, the controller is also electrically connected with the proportional valve 5, and the controller can also adjust the amount of gas flowing back to the engine combustion chamber 82 through the proportional valve 5, thereby adjusting the EGR (Exhaust Gas Recirculation Rate) of the engine.

[0035] In an embodiment, the engine ventilation system further comprises a gas extraction sensor (not shown in the figure) installed in the gas outlet pipe 2, which is used to detect the gas pressure or flow in the gas extraction pipe 1. Understandably, the gas extraction sensor can detect the pressure or flow of the gas in the gas extraction pipe 1 in real time, further ensuring the purging efficiency of the engine ventilation system on the crankcase 81.

[0036] The second embodiment of the utility model provides an engine, comprising an engine body 8, an air inlet pipe 84, an exhaust pipe 83 and the above-mentioned engine ventilation system, the engine body 8 is equipped with crankcase 81 and combustion chamber 82, the air inlet pipe 84 and the exhaust pipe 83 all communicate the combustion chamber 82.

[0037] The third embodiment of the utility model provides a vehicle comprising the above-mentioned engine.

[0038] The above is only the preferred embodiment of the utility model, and does not limit the utility model, any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An engine ventilation system characterized by, The engine ventilation system comprises a gas suction pipe and a gas discharge pipe, both of which are connected to a crankcase of the engine; An end of the gas suction pipe away from the crankcase is connected to an exhaust pipe of the engine; a regulating valve is installed in the exhaust pipe and used to regulate the gas flow from the exhaust pipe into the gas suction pipe; The engine ventilation system further comprises a drying assembly installed in the gas suction pipe, which is used to dry the gas in the gas suction pipe.

2. The engine ventilation system of claim 1, wherein, The engine ventilation system further comprises an oil-gas separator, an end of the gas discharge pipe away from the crankcase is connected to an inlet of the oil-gas separator, an oil outlet of the oil-gas separator is connected to an oil channel of the engine, and a gas outlet of the oil-gas separator is connected to the exhaust pipe.

3. The engine ventilation system of claim 2, wherein, The engine ventilation system further comprises a proportional valve, the gas outlet of the oil-gas separator is connected to an inlet of the proportional valve, a first outlet of the proportional valve is connected to the exhaust pipe, and a second outlet of the proportional valve is connected to an air intake pipe of the engine.

4. The engine ventilation system of claim 1, wherein, The engine ventilation system further comprises a hydrogen concentration sensor which extends into the crankcase and is used to detect the hydrogen concentration in the crankcase.

5. The engine ventilation system of claim 4, wherein, The engine ventilation system further comprises a controller which is electrically connected to the hydrogen concentration sensor and the regulating valve.

6. The engine ventilation system of claim 1, wherein, The engine ventilation system further comprises a gas suction sensor installed in the gas discharge pipe, which is used to detect the gas pressure or flow in the gas suction pipe.

7. An engine characterized by, The engine comprises an engine body, an air intake pipe, an exhaust pipe and the engine ventilation system as claimed in any one of claims 1 to 6; the engine body is provided with a crankcase and a combustion chamber, and the air intake pipe and the exhaust pipe are both connected to the combustion chamber.

8. A vehicle characterized by comprising: The engine comprises the engine as claimed in claim 7.

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