Non-road type engine evaporation control system

Abstract

The invention discloses a non-road type engine evaporation control system which comprises an engine body, a fuel oil supply device, a steam adsorption device and a fuel tank, and the steam adsorption device is provided with a ventilation opening communicated with the atmosphere, an adsorption opening communicated with the fuel tank and a desorption opening connected with an engine. Fuel steam enters the engine through the steam adsorption device and the fuel supply device after coming out of the fuel tank, and a secondary adsorption device is further arranged between the fuel supply device and the steam adsorption device. According to the invention, the secondary adsorption device is used for carrying out secondary adsorption on the fuel oil steam subjected to primary adsorption, so that the adsorption effect on the fuel oil steam can be improved, the evaporative emission value of the engine is reduced, the discharged steam can reach the emission standard with higher requirements, and the pollution to the atmosphere is reduced.

Description

Technical Field

[0001] The invention relates to an engine evaporation control system, in particular to a non-road engine evaporation control system. Background Art

[0002] Non-road engines refer to engines used in mechanical equipment that are not operated on public roads. Their purpose is to distinguish them from engines used on road vehicles in order to facilitate the formulation of corresponding emission standards. At present, since most non-road engines use gasoline, which is a volatile liquid, the fuel tank is often full of vapor at room temperature. In order to avoid direct emission of fuel vapor into the atmosphere and pollute the atmosphere, the vapor is usually introduced into an adsorption device, which absorbs the fuel vapor. When the engine is started, the absorbed fuel vapor re-enters the working unit for combustion, so as to achieve the purpose of saving fuel and protecting the environment.

[0003] For example, Chinese patent document CN218030387U discloses a non-road mobile machinery, including a fuel storage device, a fuel supply device, a vapor adsorption device and an engine body, wherein the vapor adsorption device is provided with a vent connected to the atmosphere, the vapor discharge hole of the fuel storage device is connected to the adsorption port of the vapor adsorption device, and further includes a valve mechanism connected between the desorption port of the vapor adsorption device and the air intake passage of the engine body, wherein the valve mechanism is a valve mechanism that is turned on when the engine body is running and is blocked when the engine body stops working.

[0004] For another example, Chinese patent document CN116357482A discloses a novel fuel evaporation adsorption system, which includes: a fuel tank, an activated carbon canister, a fuel vapor recovery control valve, an ECU, a carbon canister solenoid valve, a throttle and an engine intake manifold. The activated carbon canister is used in conjunction with the fuel vapor recovery control valve. By controlling the fuel vapor recovery control valve, excess fuel vapor in the activated carbon canister is recovered into a desorption pipeline and enters the engine intake manifold together with fresh air, thereby effectively reducing the fuel vapor discharged outside the vehicle and reducing the energy consumption of the vehicle. This not only saves the vehicle's fuel but also protects the environment. It effectively solves the problem that after the fuel vapor in the fuel tank is adsorbed into the carbon canister, the activated carbon canister will quickly become saturated, resulting in the inability to continue absorbing oil and gas, and excess fuel vapor is discharged into the atmosphere, causing secondary pollution.

[0005] In the above-mentioned prior art, an adsorption device is used to adsorb fuel vapor to prevent fuel vapor from polluting the atmosphere. However, as vehicle emission standards become increasingly stringent, the vapor emitted in the prior art will not meet the higher emission standards, and the problem of excessive emissions still exists. Summary of the invention

[0006] In order to solve the technical problem of excessive emissions in existing engines, the present invention provides a non-road engine evaporation control system, which includes an engine body, a fuel supply device, a vapor adsorption device, and a fuel tank. The vapor adsorption device is provided with a ventilation port communicating with the atmosphere, an adsorption port communicating with the fuel tank, and a desorption port connected to the engine. Fuel vapor comes out of the fuel tank, passes through the vapor adsorption device and the fuel supply device, and then enters the engine. Among them: A secondary adsorption device is further provided between the fuel supply device and the vapor adsorption device.

[0007] Compared with the prior art, in this solution, the secondary adsorption device is used to perform secondary adsorption on the fuel vapor that has undergone primary adsorption, which can improve the adsorption effect on the fuel vapor, thereby reducing the evaporation emission value of the engine, ensuring that the emitted vapor can meet higher emission standards, and reducing pollution to the atmosphere.

[0008] Preferably, the fuel supply device is provided with a balance hole, and the balance hole communicates with the fuel tank. In this solution, after setting the balance hole of the fuel supply device to communicate with the fuel tank, the fuel vapor discharged from the fuel supply device enters the fuel tank and is then absorbed by the vapor adsorption device, which is beneficial to reducing the evaporation emission.

[0009] Preferably, the fuel supply device is provided with a balance hole, and the balance hole communicates with the pipeline between the fuel tank and the vapor adsorption device. In this solution, the vapor discharged from the fuel supply device enters the vapor adsorption device through the pipeline between the fuel tank and the vapor adsorption device and is absorbed by the vapor adsorption device, which is beneficial to reducing the evaporation emission.

[0010] Preferably, the fuel supply device is provided with a balance hole, and the balance hole communicates with the pipeline between the vapor adsorption device and the secondary adsorption device. In this solution, the vapor discharged from the fuel supply device enters the secondary adsorption device through the pipeline between the vapor adsorption device and the secondary adsorption device and is subjected to secondary adsorption by the secondary adsorption device, which is beneficial to reducing the evaporation emission.

[0011] Preferably, an air filter device is provided between the secondary adsorption device and the fuel supply device. In this solution, the air filter device is used to filter the air entering the fuel supply device, thereby prolonging the service life of the engine.

[0012] Preferably, the secondary adsorption device adopts a carbon canister. As a commonly used adsorption device, adopting a carbon canister as the secondary adsorption device is beneficial to reducing the improvement difficulty and further improving the performance of reducing evaporation emissions.

[0013] Preferably, the fuel supply device is a carburetor, an electronic fuel injection valve body, or an electronic fuel injection pump. In this solution, the carburetor, the electronic fuel injection valve body, and the electronic fuel injection pump are all devices with mature technologies for supplying fuel to the intake passage of the engine body, which is beneficial to reducing the improvement difficulty and further improving the performance of reducing evaporation emissions.

[0014] The present invention has the following beneficial effects: Compared with the prior art, in this solution, the secondary adsorption device is used to perform secondary adsorption on the fuel vapor that has undergone primary adsorption, which can improve the adsorption effect on the fuel vapor, thereby reducing the evaporation emission value of the engine, ensuring that the emitted vapor can meet the higher emission standards, and reducing the pollution to the atmosphere. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of an embodiment of an evaporation control system for a non-road engine of the present invention. Detailed Description of the Invention

[0016] The following is a further detailed description through specific embodiments: 1. Definitions Vapor adsorption device: In the present invention, the vapor adsorption device is a tank body filled with activated carbon inside.

[0017] Charcoal canister: It is filled with highly adsorbent activated carbon inside.

[0018] 2. The reference numerals in the accompanying drawings of the specification include: fuel tank 1, vapor adsorption device 2, ventilation port 21, adsorption port 22, desorption port 23, secondary adsorption device 3, air filtration device 4, fuel supply device 5, engine body 6.

[0019] The embodiment is basically as shown in the attached Figure 1 figures: A non-road engine evaporation control system includes an engine body 6, a fuel supply device 5, a vapor adsorption device 2, a fuel tank 1, a secondary adsorption device 3, and an air filtration device 4. The vapor adsorption device 2 is provided with a ventilation port 21, an adsorption port 22, and a desorption port 23. The secondary adsorption device 3 is provided with an inlet and an outlet. The fuel supply device 5 is provided with a balance hole. The secondary adsorption device 3 uses a charcoal canister, and the fuel supply device 5 is a carburetor, an electronic fuel injection valve body, or an electronic fuel injection pump.

[0020] The fuel tank 1 is connected to the adsorption port 22 of the vapor adsorption device 2 through a pipeline. The desorption port 23 of the vapor adsorption device 2 is connected to the inlet of the secondary adsorption device 3 through a pipeline. The outlet of the secondary adsorption device 3 is connected to the air filtration device 4 through a pipeline. The air filtration device 4 is connected to the fuel supply device 5 through a pipeline. The fuel supply device 5 is then connected to the engine body 6. Each component is connected through a pipeline.

[0021] In this embodiment, the balance hole of the fuel supply device 5 is connected to the pipeline between the vapor adsorption device 2 and the secondary adsorption device 3. In other embodiments, the balance hole is connected to the pipeline between the fuel tank 1 and the vapor adsorption device 2 or directly connected to the fuel tank 1.

[0022] The specific implementation process is as follows: When the engine body 6 is not working, the fuel vapor in the fuel tank 1 enters the vapor adsorption device 2 through the pipeline and is adsorbed. When the engine body 6 is working, under the action of negative pressure, the adsorbed fuel vapor in the vapor adsorption device 2 desorbs and discharges from the desorption port 23, and then enters the secondary adsorption device 3 for secondary adsorption. The fuel vapor after secondary adsorption enters the engine body 6 together with air and burns.

[0023] The above are only embodiments of the present invention. Common general knowledge such as specific structures and characteristics in the solution is not described in detail here. Those of ordinary skill in the art know all the common general knowledge in the technical field to which the invention belongs before the application date or the priority date, can know all the prior art in this field, and have the ability to apply conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given by this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become obstacles for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. An off-road engine evaporation control system, comprising an engine body, a fuel supply device, a vapor adsorption device and a fuel tank. The vapor adsorption device is provided with a vent port communicating with the atmosphere, an adsorption port communicating with the fuel tank and a desorption port connected to the engine. Fuel vapor comes out from the fuel tank, passes through the vapor adsorption device and the fuel supply device, and then enters the engine. It is characterized in that: A secondary adsorption device is also provided between the fuel supply device and the vapor adsorption device.

2. The evaporative control system for a non-road engine according to claim 1, wherein: The fuel supply device is provided with a balance hole, and the balance hole communicates with the fuel tank.

3. The evaporative control system for non-road engines according to claim 1, wherein: The fuel supply device is provided with a balance hole, and the balance hole communicates with the pipeline between the fuel tank and the vapor adsorption device.

4. The evaporative control system for a non-road engine according to claim 1, wherein: The fuel supply device is provided with a balance hole, and the balance hole communicates with the pipeline between the vapor adsorption device and the secondary adsorption device.

5. The off-road engine evaporation control system according to any one of claims 1-4, characterized in that: An air filtering device is provided between the secondary adsorption device and the fuel supply device.

6. The off-road engine evaporation control system according to claim 5, characterized in that: The secondary adsorption device uses a carbon canister.

7. The non-road engine evaporation control system according to claim 6, characterized in that: The fuel supply device is a carburetor, an electronic fuel injection valve body or an electronic fuel injection fuel pump.

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