Fuel evaporation control system of gasoline engine

Abstract

The utility model relates to the technical field of fuel oil control, in particular to a gasoline engine fuel oil evaporation control system which comprises an oil tank, a carbon tank and a carburetor, the oil tank is communicated with the carbon tank through a first connecting pipe and connected with the carburetor through a second connecting pipe, the carburetor is connected into an air inlet channel of an engine, and the fuel oil evaporation control system further comprises an air filter. The air filter is communicated with the carburetor, the carbon tank is connected with a third connecting pipe, a one-way valve is arranged at the tail end of the third connecting pipe, and the one-way valve is further connected with a fourth connecting pipe. The fuel steam which is not absorbed in the carbon tank can only flow in a one-way mode, the fuel steam which is not absorbed by the carbon tank is prevented from being discharged to the outside, and the requirement for fuel evaporation and emission control in a gasoline engine system is met.

Description

Technical Field

[0001] This utility model relates to the field of fuel control technology, and in particular to a gasoline engine fuel evaporation control system. Background Technology

[0002] Most gasoline engines today are internal combustion engines, which convert the heat generated by burning fuel into mechanical energy. The fuel tank, in conjunction with the carburetor, delivers a certain proportion of fuel and air into the gasoline engine for combustion under the vacuum created by the engine's operation.

[0003] However, during the operation of the entire system, fuel is prone to evaporation, which can lead to serious air pollution problems, causing gasoline engines to fail to meet the CARB evaporative emission standards. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a gasoline engine fuel evaporation control system to improve the effect of controlling fuel evaporation emissions inside the gasoline engine system.

[0005] To solve the above-mentioned technical problems, this utility model provides a gasoline engine fuel evaporation control system, which includes a fuel tank, a carbon canister, and a carburetor. The fuel tank is connected to the carbon canister through a first connecting pipe and to the carburetor through a second connecting pipe. The carburetor is connected to the engine's intake manifold. The system also includes an air filter connected to the carburetor. The carbon canister is connected to a third connecting pipe, and a one-way valve is provided at the end of the third connecting pipe. The one-way valve is also connected to one end of a fourth connecting pipe.

[0006] In this design, the fuel tank is used to store fuel. After fuel vapor is generated, it is sent to the carbon canister through the first connecting pipe. The carbon canister absorbs the fuel vapor, preventing it from being released to the outside. The carburetor, connected to the fuel tank through the second connecting pipe, atomizes the fuel and delivers it to the engine. The carbon canister is equipped with a third connecting pipe, and a one-way valve is installed at the end of the third connecting pipe, so that the fuel vapor fluid in the carbon canister can only flow in one direction. Part of the fuel vapor passing through the carbon canister will only pass through the one-way valve and be sent to the fourth connecting pipe under negative pressure when the entire gasoline engine is started, thus preventing fuel vapor leakage.

[0007] Furthermore, the other end of the fourth connecting pipe is connected to the air filter.

[0008] In this process, the other end of the fourth connecting pipe is connected to the air filter, so that the fuel vapor passing through the carbon canister is filtered by the air filter and sent to the carburetor, where it is atomized together with the fuel in the fuel tank that is directly sent to the carburetor and then sent to the engine intake manifold.

[0009] Furthermore, the other end of the fourth connecting pipe is connected to the engine's air intake.

[0010] In this implementation, the other end of the fourth connecting pipe is directly connected to the engine's air intake. Since the fuel vapor itself is in a gaseous state, it can also be directly sent into the engine's air intake in this embodiment.

[0011] Furthermore, a fuel switch is also provided on the second connecting pipe.

[0012] The fuel switch is located on the second connecting pipe to control the transport of fuel from the fuel tank to the carburetor.

[0013] Furthermore, the oil tank is also equipped with a shut-off valve, which is installed on the oil tank, and the oil tank is connected to the first connecting pipe through the shut-off valve.

[0014] The shut-off valve is installed on the fuel tank to prevent fuel from overflowing from the shut-off valve when the fuel tank is tilted. Normally, the shut-off valve is in the open state, allowing fuel vapor to enter the first connecting pipe through the shut-off valve, thus preventing excessive pressure inside the fuel tank due to fuel evaporation.

[0015] Furthermore, the shut-off valve includes a valve body, a base, and a valve core. An elastic element is embedded between the base and the valve core. The upper and lower ends of the elastic element abut against the bottom of the valve core and the top surface of the base, respectively. The valve body is sleeved on the top of the base, and the valve body has a steam passage that communicates with the first connecting pipe.

[0016] The elastic element is disposed between the base and the valve core. In the normal placement state, the valve core is subjected to its own weight and the elastic force exerted on it by the elastic element. The weight is slightly greater than the elastic force, so the steam passage is in the open state. That is, the fuel vapor inside the fuel tank can be sent to the first connecting pipe through the shut-off valve. When the fuel tank is tilted, the weight is less than the elastic force, and the elastic element will drive the valve core to close the steam passage to prevent the fuel from being discharged to the outside through the shut-off valve. The fuel tank can also be provided with a fuel tank cap to facilitate the sealing of the filling port.

[0017] Furthermore, the valve core is provided with a plug at the top, and the plug is adapted to the inlet of the steam passage.

[0018] The plug is adapted to the inlet of the steam channel, and the combined effect of the elastic element and its own weight achieves the closure of the steam channel.

[0019] Furthermore, the shut-off valve also includes a rubber sleeve, which is fitted over the outside of the valve body, and the valve body is mounted on the oil tank via the rubber sleeve.

[0020] The rubber sleeve is fitted over the outside of the valve body and is used in conjunction with the valve body to be embedded in the oil tank, thereby improving the installation stability of the shut-off valve.

[0021] This utility model discloses a gasoline engine fuel evaporation control system. Based on the existing technology, the fuel evaporation control system is improved by adding an air filter to improve the quality of the atomized fuel entering the carburetor. A third connecting pipe and a one-way valve are connected to the carbon canister, so that the unabsorbed fuel vapor in the carbon canister can only flow in one direction, preventing the unabsorbed fuel vapor from being emitted to the outside, thereby meeting the fuel evaporation emission control requirements of the gasoline engine system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of a gasoline engine fuel evaporation control system according to the present invention.

[0024] Figure 2 This is a schematic diagram of the second embodiment of a gasoline engine fuel evaporation control system according to the present invention.

[0025] Figure 3 This is a schematic diagram of the shut-off valve of a gasoline engine fuel evaporation control system according to this utility model.

[0026] 1. Fuel tank; 2. Carbon canister; 3. Carburetor; 4. First connecting pipe; 5. Second connecting pipe; 6. Engine; 61. Intake manifold; 7. Air filter; 8. Third connecting pipe; 9. Check valve; 10. Fourth connecting pipe; 11. Fuel switch; 12. Shut-off valve; 13. Valve body; 14. Base; 15. Valve core; 16. Elastic element; 17. Steam passage; 18. Plug; 19. Rubber sleeve. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] Please see Figure 1 This utility model provides a gasoline engine fuel evaporation control system, which includes a fuel tank 1, a carbon canister 2, and a carburetor 3. The fuel tank 1 is connected to the carbon canister 2 through a first connecting pipe 4 and to the carburetor 3 through a second connecting pipe 5. The carburetor 3 is connected to the intake manifold 61 of the engine 6. The fuel evaporation control system also includes an air filter 7, which is connected to the carburetor 3. The carbon canister 2 is connected to a third connecting pipe 8, and a one-way valve 9 is provided at the end of the third connecting pipe 8. The one-way valve 9 is also connected to one end of a fourth connecting pipe 10.

[0029] In this embodiment, the fuel tank 1 is connected to the adsorption port of the carbon canister 2. When fuel vapor appears in the fuel tank 1, pressure forces the fuel vapor in the fuel tank 1 to be adsorbed in the carbon canister 2. The unadsorbed fuel vapor can be sent to the fourth connecting pipe 10 through the third connecting pipe 8 connected to the desorption port of the carbon canister 2 and the one-way valve 9 provided on the third connecting pipe 8. The one-way valve 9 is activated when the vehicle is started, allowing fuel vapor to be transported only unidirectionally to the fourth connecting pipe 10, effectively... To prevent fuel vapor from being emitted into the environment, the balance hole of the carburetor 3 is connected to a solenoid valve via a hose. When the engine is running, a negative pressure is generated in the intake manifold, causing the one-way valve 9 to open and conduct, allowing fuel vapor to be drawn into the intake manifold 61. The first solenoid valve 20 and the second solenoid valve 21 then open. When the engine is stopped, the one-way valve 9 is closed to prevent fuel vapor from escaping from the carbon canister 2 desorption port into the engine and leaking directly. The first solenoid valve 20 is closed, preventing fuel from entering the main jet, and the second solenoid valve 21 is closed, preventing fuel vapor from evaporating into the atmosphere through the balance hole.

[0030] The other end of the fourth connecting pipe 10 is connected to the air filter 7.

[0031] Please see Figure 1 In the first embodiment, the other end of the fourth connecting pipe 10 is connected to the air filter 7, so that the fuel vapor flowing through the fourth connecting pipe 10 is filtered by the air filter 7 and sent to the carburetor 3 for subsequent combustion.

[0032] The other end of the fourth connecting pipe 10 is connected to the air intake 61 of the engine 6.

[0033] Please see Figure 2 In the second embodiment, the fourth connecting pipe 10 in the control system is connected to the air intake 61 of the engine 6 to directly deliver fuel vapor into the engine. In this embodiment, the fourth connecting pipe 10 is directly connected to the air intake 61 of the engine 6.

[0034] The second connecting pipe 5 is also equipped with a fuel switch 11.

[0035] The fuel switch 11 is installed on the second connecting pipe 5 to control the delivery of fuel inside the carburetor 3.

[0036] The oil tank 1 is also equipped with a shut-off valve 12, which is installed on the oil tank 1. The oil tank 1 is connected to the first connecting pipe 4 through the shut-off valve 12.

[0037] The shut-off valve 12 is installed on the fuel tank 1 to allow fuel vapor to pass through while preventing fuel from passing through, thus preventing fuel from overflowing the fuel tank 1 when it is tilted.

[0038] The shut-off valve 12 includes a valve body 13, a base 14, and a valve core 15. An elastic element 16 is embedded between the base 14 and the valve core 15. The upper and lower ends of the elastic element 16 abut against the bottom of the valve core 15 and the top surface of the base 14, respectively. The valve body 13 is sleeved on the top of the base 14, and the valve body 13 has a steam passage 17 that is connected to the first connecting pipe 4.

[0039] Please see Figure 3 The valve body 13 is provided with the steam passage 17, which cooperates with the valve core 15 to allow fuel vapor to pass through. The base 14 cooperates with the valve core 15. Under the action of the elastic member 16, the valve core 15 tends to move towards the steam passage 17. When the fuel tank 1 is placed normally, the valve core 15 exposes the inlet of the steam passage 17 under the combined action of gravity and the driving force of the elastic member 16 to allow fuel vapor to pass through. When the fuel tank 1 is tilted, the gravity will be less than the driving force of the elastic member 16, and the valve core 15 will close the inlet of the steam passage 17 under the action of the elastic member 16 to prevent fuel leakage.

[0040] The valve core 15 is provided with a plug 18 at its top, and the plug 18 is adapted to the inlet of the steam passage 17.

[0041] The plug 18 is used to fit the inlet of the steam passage 17, thereby preventing fuel leakage from the steam passage 17 when the fuel tank 1 is tilted.

[0042] The shut-off valve 12 also includes a rubber sleeve, which is fitted over the outside of the valve body 13, and the valve body 13 is mounted on the oil tank 1 via the rubber sleeve.

[0043] The rubber sleeve is used to improve the sealing between the valve body 13 and the oil tank 1.

[0044] This utility model discloses a gasoline engine fuel evaporation control system. Based on the existing technology, it improves the layout of the fuel evaporation control system by adding a one-way valve 9 to prevent fuel vapor from leaking to the outside, and also adds a shut-off valve 12 to the fuel tank 1 to further enhance the anti-leakage capability of the fuel inside the fuel tank 1, and can also realize the fuel evaporation control of the entire gasoline engine fuel evaporation control system.

[0045] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A gasoline engine fuel evaporation control system, comprising a fuel tank (1), a carbon canister (2), and a carburetor (3), wherein the fuel tank (1) is connected to the carbon canister (2) via a first connecting pipe (4) and to the carburetor (3) via a second connecting pipe (5), and the carburetor (3) is connected to the intake manifold (61) of an engine (6), characterized in that, It also includes an air filter (7) connected to the carburetor (3), the carbon canister (2) is connected to a third connecting pipe (8), the end of the third connecting pipe (8) is provided with a one-way valve (9), and the one-way valve (9) is also connected to a fourth connecting pipe (10).

2. The gasoline engine fuel evaporation control system as described in claim 1, characterized in that, One end of the fourth connecting pipe (10) is connected to the one-way valve (9), and the other end of the fourth connecting pipe (10) is connected to the air filter (7).

3. The gasoline engine fuel evaporation control system as described in claim 1, characterized in that, One end of the fourth connecting pipe (10) is connected to the one-way valve (9), and the other end of the fourth connecting pipe (10) is connected to the intake manifold (61) of the engine (6).

4. The gasoline engine fuel evaporation control system according to any one of claims 1 to 3, characterized in that, The second connecting pipe (5) is also equipped with a fuel switch (11).

5. The gasoline engine fuel evaporation control system as described in any one of claims 1 to 3, characterized in that, The oil tank (1) is also provided with a shut-off valve (12), which is installed on the oil tank (1). The oil tank (1) is connected to the first connecting pipe (4) through the shut-off valve (12).

6. The gasoline engine fuel evaporation control system as described in claim 5, characterized in that, The shut-off valve (12) includes a valve body (13), a base (14) and a valve core (15). An elastic element (16) is embedded between the base (14) and the valve core (15). The upper and lower ends of the elastic element (16) abut against the bottom of the valve core (15) and the top surface of the base (14) respectively. The valve body (13) is sleeved on the top of the base (14), and the valve body (13) has a steam passage (17) that is connected to the first connecting pipe (4).

7. The gasoline engine fuel evaporation control system as described in claim 6, characterized in that, The valve core (15) is provided with a plug (18) at the top, and the plug (18) is adapted to the inlet of the steam passage (17).

8. The gasoline engine fuel evaporation control system as described in claim 7, characterized in that, The shut-off valve (12) also includes a rubber sleeve, which is fitted over the outside of the valve body (13), and the valve body (13) is mounted on the oil tank (1) through the rubber sleeve.

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