Novel fuel evaporation system
By employing a fuel evaporation system in gasoline engine sets and utilizing negative pressure to control the adsorption and desorption of fuel vapors, the problem of fuel vapor escape is solved, achieving the effects of reducing waste and pollution, and lowering costs. This method is applicable to general-purpose gasoline engine sets.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHONGQING AMPRIDE POWER & MACHINERY CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-04
Smart Images
Figure CN2025097548_04062026_PF_FP_ABST
Abstract
Description
A novel fuel evaporation system
[0001] Cross-reference to related applications
[0002] This application claims priority to Chinese Patent Application No. 2024117039962, filed on November 26, 2024, entitled "A Novel Fuel Evaporation System", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the technical field of engine fuel, and in particular to a novel fuel evaporation system. Background Technology
[0004] Cars are equipped with gasoline generator sets. To meet environmental and economic requirements, existing gasoline generator sets typically include a carbon canister between the fuel tank and the engine. The carbon canister adsorbs and stores gasoline vapors evaporated from the fuel tank, preventing them from directly evaporating into the air. The desorption port of the carbon canister connects to the air filter. However, some fuel vapors that are not adsorbed by the carbon canister escape through the desorption port into the air filter and are directly emitted into the air, causing waste and pollution. To prevent this escape, cars use electronically controlled valves, but this structure is costly and complex, making it unsuitable for general-purpose gasoline generator sets.
[0005] Application content
[0006] In order to reduce the direct emission of fuel vapor into the air, which causes waste and pollution, and at the same time reduce costs, simplify the structure, and make it suitable for general-purpose gasoline generator sets, this application provides a novel fuel evaporation system.
[0007] The novel fuel evaporation system provided in this application adopts the following technical solution:
[0008] A novel fuel evaporation system includes an engine, an intake manifold, a fuel tank, and a carbon canister. The fuel tank is equipped with a fuel pump and a tilt valve. The carbon canister is equipped with an adsorption port and a desorption port. The fuel pump is connected to the intake manifold, and the tilt valve is connected to the adsorption port. A one-way valve is provided between the intake manifold and the carbon canister. The inlet of the one-way valve is connected to the desorption port, and the outlet of the one-way valve is connected to the intake manifold.
[0009] By adopting the above technical solution, the various components in this system can be connected by pipes according to actual conditions. When the engine is not running, the gasoline in the fuel tank evaporates to produce fuel vapor, which enters the carbon canister and is adsorbed by carbon powder. The carbon canister desorption port is equipped with a one-way valve. At this time, there is no negative pressure in the intake manifold, and the one-way valve is in the closed state, so the fuel vapor cannot escape into the air through the desorption port, reducing environmental pollution.
[0010] When the engine is running, the vacuum pump draws fuel from the fuel tank into the intake manifold, where it enters the engine for combustion. During the intake stroke, a negative pressure is created in the intake manifold. This negative pressure opens a one-way valve, connecting the carbon canister to the intake manifold. The negative pressure desorbs fuel vapors from the carbon canister, which then enters the combustion chamber for combustion. This utilization of the adsorbed fuel vapors in the carbon canister improves fuel economy and reduces costs. Furthermore, compared to the electronically controlled valves used in automobiles, this system simplifies the structure and is suitable for general-purpose gasoline generator sets.
[0011] Optionally, a two-way valve is provided between the fuel tank and the carbon canister, with the inlet of the two-way valve connected to the tilt valve and the outlet of the two-way valve connected to the adsorption port.
[0012] By adopting the above technical solution, the two-way valve can be set with a pressure setting value according to the actual situation. When the pressure in the fuel tank is greater than the setting value, the two-way valve is fully opened, and fuel vapor enters the carbon canister and is adsorbed by carbon powder. When the pressure generated by the fuel vapor in the fuel tank is less than the pressure setting value of the two-way valve, the two-way valve is closed, and a small amount of fuel vapor enters the carbon canister, reducing the amount of fuel evaporation.
[0013] Optionally, a valve body assembly is provided between the fuel tank and the intake manifold. The valve body assembly is a three-way valve including two inlets and one outlet. One inlet of the valve body assembly is connected to the fuel pump, the other outlet of the valve body assembly is connected to an air filter, and the outlet of the valve body assembly is connected to the intake manifold.
[0014] By adopting the above technical solution, the air filter can filter the air entering the engine combustion chamber through the intake manifold, reducing impurities in the air participating in combustion and making the air purer during the combustion process. The valve assembly provides overall control over the fuel and air entering the intake manifold, starting when the engine is running and closing when the engine is not running, making it easy to operate.
[0015] Optionally, the carbon canister is provided with an air vent, and an air pressure valve is provided at the air vent.
[0016] By adopting the above technical solution, when the engine is not working, the one-way valve is closed. If the fuel vapor in the carbon canister is saturated, the air pressure in the carbon canister increases, and the excess fuel vapor can be discharged through the vent to the atmosphere, releasing the pressure in the carbon canister and maintaining air pressure balance.
[0017] In summary, this application includes at least the following beneficial technical effects:
[0018] When the engine is not running, gasoline in the fuel tank evaporates, producing fuel vapor. A two-way valve is installed between the fuel tank and the carbon canister adsorption port. This two-way valve can be set with a pressure setpoint. When the pressure in the fuel tank exceeds the setpoint, the valve opens fully, allowing fuel vapor to enter the carbon canister and be adsorbed by carbon powder. When the pressure generated by the fuel vapor in the fuel tank is less than the valve's pressure setpoint, the valve closes, allowing a small amount of fuel vapor to enter the carbon canister, reducing fuel evaporation. The carbon canister desorption port is equipped with a one-way valve. At this time, there is no negative pressure in the intake manifold, and the one-way valve is closed, preventing fuel vapor from escaping into the air through the desorption port, thus reducing environmental pollution.
[0019] When the engine is running, the vacuum pump draws fuel from the fuel tank into the intake manifold, where it enters the engine for combustion. During the intake stroke, a negative pressure is created in the intake manifold. This negative pressure opens a one-way valve, connecting the carbon canister to the intake manifold. The negative pressure desorbs fuel vapors from the carbon canister, which then enters the combustion chamber for combustion. This utilization of the adsorbed fuel vapors in the carbon canister improves fuel economy and reduces costs. Furthermore, compared to the electronically controlled valves used in automobiles, this system simplifies the structure and is suitable for general-purpose gasoline generator sets. Attached Figure Description
[0020] Figure 1 is a schematic diagram of the overall structure of a novel fuel evaporation system according to an embodiment of this application.
[0021] Explanation of reference numerals in the attached diagram: 1. Engine; 2. Intake manifold; 3. Fuel tank; 31. Fuel pump; 32. Tilting valve; 4. Carbon canister; 41. Adsorption port; 42. Desorption port; 5. Valve body assembly; 6. Air filter; 7. Vent for atmospheric air; 8. Two-way valve; 9. One-way valve. Detailed Implementation
[0022] The present application will be further described in detail below with reference to Figure 1.
[0023] This application discloses a novel fuel evaporation system. Referring to FIG1, the novel fuel evaporation system includes an engine 1, an intake manifold 2, a fuel tank 3, and a carbon canister 4. The fuel tank 3 is equipped with a fuel pump 31 and a tilt valve 32. The carbon canister 4 is equipped with an adsorption port 41 and a desorption port 42. The fuel pump 31 is connected to the intake manifold 2, and the tilt valve 32 is connected to the adsorption port 41. A one-way valve 9 is provided between the intake manifold 2 and the carbon canister 4. The inlet of the one-way valve 9 is connected to the desorption port 42, and the outlet of the one-way valve 9 is connected to the intake manifold 2. A two-way valve 8 is provided between the fuel tank 3 and the carbon canister 4. The inlet of the two-way valve 8 is connected to the tilt valve 32, and the outlet of the two-way valve 8 is connected to the adsorption port 41.
[0024] A valve body assembly 5 is located between the fuel tank 3 and the intake manifold 2. The valve body assembly 5 is a three-way valve with two inlets and one outlet. One inlet of the valve body assembly 5 is connected to the fuel pump 31, and the other outlet is connected to an air filter 6. The outlet of the valve body assembly 5 is connected to the intake manifold 2. The air filter 6 filters the air entering the combustion chamber of the engine 1 through the intake manifold 2, reducing impurities in the air participating in combustion and resulting in cleaner air during combustion. The valve body assembly 5 provides overall control of the fuel and air entering the intake manifold 2, starting when the engine 1 is running and closing when the engine 1 is not running, making it easy to operate. All components in this system are connected via pipes.
[0025] The carbon canister 4 is equipped with an atmospheric vent 7, and an air pressure valve is installed at the atmospheric vent 7. When the engine 1 is not running, the one-way valve 9 is closed. If the fuel vapor in the carbon canister 4 is saturated, the air pressure in the carbon canister 4 increases, and the excess fuel vapor can be discharged through the atmospheric vent 7, releasing the pressure in the carbon canister 4 and maintaining air pressure balance.
[0026] The implementation principle of a novel fuel evaporation system according to an embodiment of this application is as follows: When the engine 1 is not working, gasoline in the fuel tank 3 evaporates to produce fuel vapor. A two-way valve 8 is installed between the fuel tank 3 and the adsorption port 41 of the carbon canister 4. The two-way valve 8 can be set with a pressure setpoint according to actual conditions. When the pressure in the fuel tank 3 is greater than the setpoint, the two-way valve 8 is fully open, and the fuel vapor enters the carbon canister 4 and is adsorbed by carbon powder. When the pressure generated by the fuel vapor in the fuel tank 3 is less than the pressure setpoint of the two-way valve 8, the two-way valve 8 is closed, and a small amount of fuel vapor enters the carbon canister 4, reducing the amount of fuel evaporation. The desorption port 42 of the carbon canister 4 is equipped with a one-way valve 9. At this time, there is no negative pressure in the intake manifold 2, and the one-way valve 9 is in the closed state, so the fuel vapor cannot escape into the air through the desorption port 42, reducing environmental pollution.
[0027] When engine 1 is running, the vacuum pump draws fuel from fuel tank 3 into intake manifold 2, which then enters engine 1 for combustion. During engine 1's operation, an intake stroke creates negative pressure in intake manifold 2. This negative pressure opens one-way valve 9, connecting the carbon canister 4 to intake manifold 2. Due to the negative pressure, fuel vapor in the carbon canister 4 is desorbed, and the fuel vapor in the carbon canister 4 enters the combustion chamber for combustion. The adsorbed fuel vapor in the carbon canister 4 is utilized, improving fuel economy and reducing costs. Furthermore, compared to the electronically controlled valve structure used in automobiles, this system simplifies the structure and is suitable for general-purpose gasoline generator sets.
[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application. Industrial applicability
[0029] The novel fuel evaporation system of this application can reduce the direct emission of fuel vapor into the air, thus reducing waste and pollution, while also lowering costs, simplifying the structure, and being applicable to general-purpose gasoline generator sets.
Claims
1. A novel fuel evaporation system, characterized in that: The system includes an engine (1), an intake manifold (2), a fuel tank (3), and a carbon canister (4). The fuel tank (3) is equipped with a fuel pump (31) and a tilt valve (32). The carbon canister (4) is equipped with an adsorption port (41) and a desorption port (42). The fuel pump (31) is connected to the intake manifold (2), and the tilt valve (32) is connected to the adsorption port (41). A one-way valve (9) is provided between the intake manifold (2) and the carbon canister (4). The inlet of the one-way valve (9) is connected to the desorption port (42), and the outlet of the one-way valve (9) is connected to the intake manifold (2).
2. The novel fuel evaporation system according to claim 1, characterized in that: A two-way valve (8) is provided between the fuel tank (3) and the carbon canister (4). The inlet of the two-way valve (8) is connected to the tilt valve (32), and the outlet of the two-way valve (8) is connected to the adsorption port (41).
3. The novel fuel evaporation system according to claim 1, characterized in that: A valve body assembly (5) is provided between the fuel tank (3) and the air intake (2). The valve body assembly (5) is a three-way valve including two inlets and one outlet. One inlet of the valve body assembly (5) is connected to the fuel pump (31), and the other outlet of the valve body assembly (5) is connected to the air filter (6). The outlet of the valve body assembly (5) is connected to the air intake (2).
4. A novel fuel evaporation system according to any one of claims 1-3, characterized in that: The carbon canister (4) is provided with an air vent (7), and an air pressure valve is provided at the air vent (7).