A fuel system and vehicle

Abstract

The application discloses a fuel system and a vehicle. The fuel system comprises an oil tank, a carbon canister, a first connecting pipeline and an integrated valve. The oil tank is directly communicated with the carbon canister through the first connecting pipeline. The integrated valve comprises a pressure balance valve group, a first pipeline, a second pipeline and a third pipeline. The first pipeline is respectively communicated with the pressure balance valve group and the carbon canister. The third pipeline is respectively communicated with the pressure balance valve group and an external environment. The pressure balance valve group is arranged to conduct or cut off the first pipeline and the second pipeline, conduct or cut off the first pipeline and the third pipeline, and conduct or cut off the second pipeline and the third pipeline, so as to adjust the air pressure state of the oil tank. The fuel system can adjust the air pressure between the carbon canister, the oil tank directly communicated with the carbon canister and the external environment through the integrated valve, reduce the volatilization of fuel vapor in the carbon canister to the external environment, and save the installation space without arranging an isolation device between the oil tank and the carbon canister.

Description

Technical Field

[0001] This application relates to the field of fuel system technology, and in particular to a fuel system and a vehicle. Background Technology

[0002] As people's environmental awareness gradually increases, national environmental protection policies are becoming stricter, and hydrocarbon emission requirements are becoming more stringent. Under the increasingly stringent National VI emission regulations and fuel consumption requirements, more and more hybrid vehicles are emerging.

[0003] Currently, a fuel tank isolation device is often required between the fuel tank and the charcoal canister. However, the fuel tank isolation device can only reduce the evaporation of fuel vapor from the fuel tank into the charcoal canister, while the fuel vapor in the charcoal canister is not effectively restricted. Furthermore, the fuel tank isolation device is located on the outside of the fuel tank, occupying a lot of space, which limits the volume of the fuel tank. Summary of the Invention

[0004] The main objective of this application is to provide a fuel system and vehicle that addresses the aforementioned technical problems existing in the prior art.

[0005] To solve the above problems, the fuel system includes: a fuel tank, a charcoal canister, a first connecting pipe, and an integrated valve. The fuel tank is directly connected to the charcoal canister through the first connecting pipe. The integrated valve includes a pressure balancing valve assembly, a first pipe, a second pipe, and a third pipe. The first pipe is connected to the pressure balancing valve assembly and the charcoal canister, and the third pipe is connected to the pressure balancing valve assembly and the external environment. The pressure balancing valve assembly is configured to open or close the first and second pipes, open or close the first and third pipes, and open or close the second and third pipes to regulate the air pressure in the fuel tank.

[0006] In some embodiments, the pressure balancing valve assembly includes a solenoid valve, one end of a first pipe is connected to the solenoid valve and the other end is connected to the charcoal canister, one end of a third pipe is connected to the solenoid valve and the other end is connected to the external environment; when the oil tank is in the oil inlet state, the solenoid valve opens the first pipe and the third pipe to make the air pressure in the oil tank the same as the air pressure in the external environment.

[0007] In some embodiments, the pressure balancing valve assembly includes a first balancing pipe and a first pressure balancing valve. The first pressure balancing valve is disposed in the first balancing pipe, and the first balancing pipe is connected to the first pipe and the second pipe respectively. When the oil tank pressure is greater than the external ambient pressure, the solenoid valve opens the second pipe and the third pipe, and the first pressure balancing valve opens in one direction to connect the first pipe, the first balancing pipe and the second pipe so that the oil tank pressure is the same as the external environment.

[0008] In some embodiments, when the fuel tank pressure is greater than the external ambient pressure, and the first difference between the fuel tank pressure and the external ambient pressure is greater than a first preset difference threshold, the first pressure balancing valve opens with a first opening degree; when the fuel tank pressure is greater than the external ambient pressure, and the first difference between the fuel tank pressure and the external ambient pressure is greater than a second preset difference threshold, the first pressure balancing valve opens with a second opening degree; the first preset difference threshold is greater than the second preset difference threshold, and the first opening degree is greater than the second opening degree.

[0009] In some embodiments, the pressure balancing valve assembly includes a second balancing pipe and a second pressure balancing valve. The second pressure balancing valve is disposed in the second balancing pipe, which is connected to the first pipe and the second pipe respectively. When the tank pressure is lower than the ambient pressure, the solenoid valve opens the second pipe and the third pipe, and the second pressure balancing valve opens in one direction to connect the second pipe, the second balancing pipe and the first pipe, so that the tank pressure is the same as the ambient pressure.

[0010] In some embodiments, the pressure balancing valve assembly includes a solenoid valve, one end of a first pipe is connected to the solenoid valve and the other end is connected to the charcoal canister, one end of a third pipe is connected to the solenoid valve and the other end is connected to the external environment, and the fuel system also includes a second connecting pipe and a charcoal canister solenoid valve, the charcoal canister solenoid valve is connected to the second connecting pipe, and the charcoal canister solenoid valve is configured to open or close the second connecting pipe and the external system; when the charcoal canister is in a desorbed state, the solenoid valve opens the first pipe and the third pipe, the charcoal canister solenoid valve opens the second connecting pipe and the external system, and under the negative pressure provided by the external system, it draws gas from the charcoal canister.

[0011] In some embodiments, the fuel system also includes a dust filter, and a third conduit communicates with the external environment through the dust filter.

[0012] In some embodiments, the pressure balancing valve assembly includes a solenoid valve, a first pressure balancing valve, a second pressure balancing valve, a first balancing pipe, and a second balancing pipe; the solenoid valve is connected to the first pipe, the second pipe, and the third pipe respectively, and is configured to open or close the first pipe and the third pipe, and to open or close the second pipe and the third pipe; the first pressure balancing valve is located in the first balancing pipe, the second pressure balancing valve is located in the second balancing pipe, and the first balancing pipe and the second balancing pipe are connected to the first pipe and the second pipe respectively.

[0013] In some embodiments, the integrated valve further includes a fourth pipe and a fifth pipe, one end of the fourth pipe being connected to a solenoid valve and the other end being connected to a third pipe, one end of the fifth pipe being connected to the fourth pipe and the other end being connected to a second pipe, at least a portion of the diameter of the fifth pipe being different from the diameter of the remaining portion, the fourth pipe being provided with an air pump for generating pressure; the solenoid valve is configured to open or close the first pipe and the fourth pipe.

[0014] To address the aforementioned problems, this application provides a vehicle including the aforementioned fuel system.

[0015] Compared with the prior art, the fuel system of this application includes: a fuel tank, a charcoal canister, a first connecting pipe, and an integrated valve. The fuel tank is directly connected to the charcoal canister through the first connecting pipe. The integrated valve includes a pressure balancing valve assembly, a first pipe, a second pipe, and a third pipe. The first pipe is connected to the pressure balancing valve assembly and the charcoal canister, and the third pipe is connected to the pressure balancing valve assembly and the external environment. The pressure balancing valve assembly is configured to open or close the first and second pipes, open or close the first and third pipes, and open or close the second and third pipes to regulate the air pressure state of the fuel tank. Through the above implementation method, the integrated valve can regulate the air pressure between the first, second, and third pipes through the pressure balancing valve group. The first pipe is connected to the pressure balancing valve group and the charcoal canister, and the third pipe is connected to the pressure balancing valve group and the external environment. This facilitates the pressure balancing valve group in regulating the air pressure between the charcoal canister and the external environment. The fuel tank is directly connected to the charcoal canister through the first connecting pipe. Thus, the fuel system can regulate the air pressure between the charcoal canister, the fuel tank directly connected to the charcoal canister, and the external environment through the integrated valve, reducing the risk of fuel vapor in the charcoal canister evaporating into the external environment. Since the fuel tank is directly connected to the charcoal canister, there is no need to install an isolation device between the charcoal canister and the fuel tank to restrict fuel vapor from entering the charcoal canister from the fuel tank. This reduces the risk that the isolation device occupies a large installation space, forcing a reduction in the fuel tank volume. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments;

[0018] Figure 2 This is a schematic diagram of a fuel system in an inlet state according to one or more embodiments;

[0019] Figure 3 This is a schematic diagram of a fuel system in a depressurized state according to one or more embodiments;

[0020] Figure 4 This is a schematic diagram of a fuel system in a supplemental air state according to one or more embodiments;

[0021] Figure 5This is a schematic diagram of a fuel system in a charcoal canister desorption state according to one or more embodiments;

[0022] Figure 6 This is a schematic diagram of a fuel system in the air pumping state according to one or more embodiments.

[0023] Reference numerals: Vehicle 1; Fuel system 2; Fuel tank 10; Charcoal canister 20; First connecting pipe 30; Integrated valve 40; Dust filter 50; Second connecting pipe 60; Charcoal canister solenoid valve 70; Pressure balancing valve assembly 110; Solenoid valve 111; First pressure balancing valve 112; Second pressure balancing valve 113; First balancing pipe 114; Second balancing pipe 115; First pipe 120; Second pipe 130; Third pipe 140; Fourth pipe 150; Air pump 151; Fifth pipe 160. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] As people's environmental awareness gradually increases, national environmental protection policies are becoming stricter, and hydrocarbon emission requirements are becoming more stringent. Under the increasingly stringent National VI emission regulations and fuel consumption requirements, more and more hybrid vehicles are emerging.

[0033] Currently, a fuel tank isolation device is often required between the fuel tank and the charcoal canister. However, the fuel tank isolation device can only reduce the evaporation of fuel vapor from the fuel tank into the charcoal canister, while the fuel vapor in the charcoal canister is not effectively restricted. Furthermore, the fuel tank isolation device is located on the outside of the fuel tank, occupying a lot of space, which limits the volume of the fuel tank.

[0034] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0035] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Vehicle 1 can be a front-wheel drive vehicle, a four-wheel drive vehicle, etc. Vehicle 1 is equipped with a fuel system 2, which can be used to control fuel evaporation during vehicle 1's operation or when the vehicle is stationary.

[0036] Please refer to Figures 2-6 , Figure 2 This is a schematic diagram of a fuel system in an inlet state according to one or more embodiments; Figure 3 This is a schematic diagram of a fuel system in a depressurized state according to one or more embodiments; Figure 4 This is a schematic diagram of a fuel system in a supplemental air state according to one or more embodiments; Figure 5 This is a schematic diagram of a fuel system in a charcoal canister desorption state according to one or more embodiments; Figure 6 This is a schematic diagram of a fuel system in the air pumping state according to one or more embodiments.

[0037] This application provides a fuel system 2, which includes a fuel tank 10, a charcoal canister 20, a first connecting pipe 30, and an integrated valve 40. The fuel tank 10 is directly connected to the charcoal canister 20 via the first connecting pipe 30. The integrated valve 40 includes a pressure balancing valve assembly 110, a first pipe 120, a second pipe 130, and a third pipe 140. The first pipe 120 is connected to both the pressure balancing valve assembly 110 and the charcoal canister 20, and the third pipe 140 is connected to both the pressure balancing valve assembly 110 and the external environment. The pressure balancing valve assembly 110 is configured to open or close the first pipe 120 and the second pipe 130, the first pipe 120 and the third pipe 140, and the second pipe 130 and the third pipe 140, to regulate the pressure state of the fuel tank 10. In some application scenarios, the fuel system 2 can also be referred to as a fuel evaporative emission leak diagnostic system. The fuel tank 10 can be used to store fuel. Fuel tank 10 is directly connected to charcoal canister 20 via first connecting pipe 30. Fuel vapors evaporate in fuel tank 10 and can directly enter charcoal canister 20 via first connecting pipe 30. Charcoal canister 20 can capture and store fuel vapors to prevent them from entering the external environment and causing environmental pollution. After entering charcoal canister 20, the fuel vapors are adsorbed and stored by charcoal canister 20. Pressure balancing valve assembly 110 is connected to charcoal canister 20 via first pipe 120. Third pipe 140 connects pressure balancing valve assembly 110 to the external environment. Pressure balancing valve assembly 110 can open or close first pipe 120 and second pipe 130, open or close first pipe 120 and third pipe 140, and open or close second pipe 130 and third pipe 140. For example, pressure balancing valve assembly 110 can open first pipe 120 and second pipe 130 to allow gas to enter second pipe 130 from first pipe 120 or to allow gas to enter first pipe 120 from second pipe 130. Alternatively, the pressure balancing valve assembly 110 can shut off the first pipe 120 and the second pipe 130 to prevent gas from entering the second pipe 130 from the first pipe 120 or from entering the first pipe 120 from the second pipe 130. Alternatively, the pressure balancing valve assembly 110 can shut off the first pipe 120 and the third pipe 140 or the second pipe 130 and the third pipe 140, thereby reducing the risk of fuel vapor escaping from the charcoal canister 20 to the external environment. Thus, the fuel system 2 can limit fuel vapor emissions through the integrated valve 40, while simultaneously regulating the air pressure between the charcoal canister 20, the fuel tank 10 directly connected to the charcoal canister 20, and the external environment, thereby reducing the risk of fuel vapor evaporating from the charcoal canister 20 to the external environment. Since the fuel tank 10 is directly connected to the charcoal canister 20, there is no need to install an isolation device between the charcoal canister 20 and the fuel tank 10 to restrict fuel vapor from entering the charcoal canister 20 from the fuel tank 10, thus reducing the risk that the isolation device would occupy a large installation space and force a reduction in the volume of the fuel tank 10.

[0038] In some embodiments, the pressure balancing valve assembly 110 includes a solenoid valve 111. One end of a first pipe 120 is connected to the solenoid valve 111, and the other end is connected to the carbon canister 20. One end of a third pipe 140 is connected to the solenoid valve 111, and the other end is connected to the external environment. When the oil tank 10 is in the oil-filling state, the solenoid valve 111 opens the first pipe 120 and the third pipe 140 to make the air pressure in the oil tank 10 the same as the air pressure in the external environment. The solenoid valve 111 may consist of a valve body, a coil, a valve core, and a control power supply. When current passes through the coil, the generated magnetic field attracts or repels the valve core, thereby changing the channel state inside the valve body, and thus opening or closing the first pipe 120 and the third pipe 140. When the oil tank 10 is in the oil-filling state, the solenoid valve 111 opens the first pipe 120 and the third pipe 140. When fuel enters the fuel tank 10, the pressure inside the fuel tank 10 increases. The gas mixture inside the fuel tank 10 enters the charcoal canister 20 through the first connecting pipe 30. The fuel vapor in the gas mixture is adsorbed and stored in the charcoal canister 20. The adsorbed gas mixture enters the first pipe 120, and then enters the third pipe 140 through the solenoid valve 111 and enters the external environment. In some other application scenarios, when the fuel tank 10 is not in the fuel-filling state, the solenoid valve 111 can also close the first pipe 120 and the third pipe 140 and open the second pipe 130 and the third pipe 140 to prevent the gas in the fuel tank 10 and the charcoal canister 20 from directly entering the external environment. Therefore, when the oil tank 10 is in the oil-filling state, the electromagnetic field can connect the first pipe 120 and the third pipe 140, thereby balancing the air pressure inside the oil tank 10 and the external ambient air pressure, so that the air pressure in the oil tank 10 is the same as the external ambient air pressure. Here, the air pressure in the oil tank 10 being the same as the external ambient air pressure means that the difference between the air pressure in the oil tank 10 and the external ambient air pressure is within a safe range, rather than limiting the air pressure in the oil tank 10 to be completely consistent with the external ambient air pressure.

[0039] In some embodiments, the pressure balancing valve assembly 110 includes a first balancing pipe 114 and a first pressure balancing valve 112. The first pressure balancing valve 112 is disposed in the first balancing pipe 114, which is connected to the first pipe 120 and the second pipe 130 respectively. When the air pressure in the oil tank 10 is greater than the air pressure in the external environment, the solenoid valve 111 opens the second pipe 130 and the third pipe 140, and the first pressure balancing valve 112 opens in one direction to connect the first pipe 120, the first balancing pipe 114 and the second pipe 130, so that the air pressure in the oil tank 10 is the same as that in the external environment.

[0040] In some embodiments, the pressure balancing valve assembly 110 includes a first balancing pipe 114 and a first pressure balancing valve 112. The first pressure balancing valve 112 is disposed in the first balancing pipe 114, which is connected to a first pipe 120 and a second pipe 130. When the air pressure in the oil tank 10 is greater than the external ambient air pressure, the first pressure balancing valve 112 opens in one direction, thereby connecting the first pipe 120, the first balancing pipe 114, and the second pipe 130, so that the air pressure in the oil tank 10 is the same as the external ambient air pressure. Exemplarily, the first pipe 120 and the second pipe 130 can be arranged side by side, and the first balancing pipe 114 can be connected to the first pipe 120 and the second pipe 130 through the side walls of the first pipe 120 and the second pipe 130, respectively. When the pressure in the fuel tank 10 is greater than the external ambient pressure, it can mean that the pressure difference between the fuel tank 10 and the external environment reaches a certain level. For example, when the pressure inside the fuel tank 10 is greater than the pressure in the external environment and the pressure difference between the fuel tank 10 and the external environment reaches a preset threshold, the first pressure balancing valve 112 opens in one direction, allowing the first pipeline 120, the first balancing pipeline 114 and the second pipeline 130 to be unidirectionally connected. This allows gas to enter the second pipeline 130 from the first pipeline 120 via the first balancing pipeline 114, and then enter the external environment from the third pipeline 140 via the solenoid valve 111. At the same time, it prevents gas from entering the first pipeline 120 from the second pipeline 130 via the first balancing pipeline 114. Therefore, the air pressure of the oil tank 10 can be adjusted by the first pressure balancing valve 112 and the first balancing pipe 114 so that the air pressure of the oil tank 10 is the same as the external ambient air pressure. Here, the air pressure of the oil tank 10 being the same as the external ambient air pressure means that the difference between the air pressure of the oil tank 10 and the external ambient air pressure is within a safe range, rather than limiting the air pressure of the oil tank 10 to be completely consistent with the external ambient air pressure.

[0041] Furthermore, when the pressure in the fuel tank 10 is greater than the external ambient pressure, and the first difference between the pressure in the fuel tank 10 and the external ambient pressure is greater than a first preset difference threshold, the first pressure balancing valve 112 opens at a first opening degree; when the pressure in the fuel tank 10 is greater than the external ambient pressure, and the first difference between the pressure in the fuel tank 10 and the external ambient pressure is greater than a second preset difference threshold, the first pressure balancing valve 112 opens at a second opening degree; when the first preset difference threshold is greater than the second preset difference threshold, the first opening degree is greater than the second opening degree. The first pressure balancing valve 112 can be set with two opening degree positions. At different opening degree positions, the opening degree of the first pressure balancing valve 112 is different. The two opening degree positions can include a first opening degree position and a second opening degree position, wherein the first opening degree corresponding to the first opening degree position can be greater than the second opening degree corresponding to the second opening degree position. For example, when the pressure in the fuel tank 10 is greater than the external ambient pressure, and the first difference between the pressure in the fuel tank 10 and the external ambient pressure is greater than a first preset difference threshold, the first pressure balancing valve 112 is in a first opening position, opening to allow gas to enter the second pipeline 130 from the first pipeline 120 via the first balancing pipeline 114 at a relatively high flow rate per unit time. When the pressure in the fuel tank 10 is greater than the external ambient pressure, and the first difference between the pressure in the fuel tank 10 and the external ambient pressure is greater than a second preset difference threshold but less than the first preset difference threshold, the first pressure balancing valve 112 is in a second opening position, opening to allow gas to enter the second pipeline 130 from the first pipeline 120 via the first balancing pipeline 114 at a relatively low flow rate per unit time. When the first difference between the pressure in the fuel tank 10 and the external ambient pressure is less than the second preset difference threshold, the first pressure balancing valve 112 closes the first balancing pipeline 114, preventing gas from flowing between the first pipeline 120 and the second pipeline 130 through the first balancing pipeline 114. In other embodiments, the first pressure balancing valve 112 may be configured with other opening degrees according to actual needs. Thus, the first pressure balancing valve 112 can adapt to different pressure conditions between the first pipe 120 and the second pipe 130 by using different opening degrees, thereby more flexibly balancing the air pressure between the first pipe 120 and the second pipe 130, as well as between the oil tank 10 and the external environment. This also reduces the risk that components inside the oil tank 10 may be pushed by the airflow and block the first connecting pipe 30, or components inside the charcoal canister 20 may be pushed by the airflow and block the first pipe 120.

[0042] In some embodiments, the pressure balancing valve assembly 110 includes a second balancing pipe 115 and a second pressure balancing valve 113. The second pressure balancing valve 113 is disposed in the second balancing pipe 115, which is connected to the first pipe 120 and the second pipe 130, respectively. When the air pressure in the oil tank 10 is lower than the external ambient air pressure, the solenoid valve 111 opens the second pipe 130 and the third pipe 140, and the second pressure balancing valve 113 opens in one direction, so that the second pipe 130, the second balancing pipe 115, and the first pipe 120 are connected, making the air pressure in the oil tank 10 the same as the external ambient air pressure. Exemplarily, the first pipe 120 and the second pipe 130 can be arranged side by side, and the second balancing pipe 115 can be connected to the first pipe 120 and the second pipe 130 through the side walls of the first pipe 120 and the second pipe 130, respectively. When the air pressure in the fuel tank 10 is lower than the air pressure in the external environment, the pressure difference between the fuel tank 10 and the external environment can reach a certain level. For example, when the pressure in the fuel tank 10 is lower than the pressure in the external environment and the pressure difference between the fuel tank 10 and the external environment reaches a preset threshold, the second pressure balancing valve 113 opens in one direction, allowing the second pipeline 130, the second balancing pipeline 115 and the first pipeline 120 to be unidirectionally connected. This allows gas in the external environment to enter the second pipeline 130 from the third pipeline 140 through the solenoid valve 111, and then enter the first pipeline 120 through the second pipeline 130 via the second balancing pipeline 115, while preventing gas from entering the second pipeline 130 from the first pipeline 120 via the second balancing pipeline 115. Therefore, the air pressure of the oil tank 10 can be adjusted by the second pressure balancing valve 113 and the second balancing pipe 115 so that the air pressure of the oil tank 10 is the same as the external ambient air pressure. Here, the air pressure of the oil tank 10 being the same as the external ambient air pressure means that the difference between the air pressure of the oil tank 10 and the external ambient air pressure is within a safe range, rather than limiting the air pressure of the oil tank 10 to be completely consistent with the external ambient air pressure.

[0043] In some embodiments, the pressure balancing valve assembly 110 includes a solenoid valve 111. One end of a first pipe 120 is connected to the solenoid valve 111, and the other end is connected to the charcoal canister 20. One end of a third pipe 140 is connected to the solenoid valve 111, and the other end is connected to the external environment. The fuel system 2 also includes a second connecting pipe 60 and a charcoal canister solenoid valve 70. The charcoal canister solenoid valve 70 is connected to the second connecting pipe 60 and configured to open or close the second connecting pipe 60 and the external system. When the charcoal canister 20 is in a desorbed state, the solenoid valve 111 opens the first pipe 120 and the third pipe 140, and the charcoal canister solenoid valve 70 opens the second connecting pipe 60 and the external system. Under the negative pressure provided by the external system, it draws gas from the charcoal canister 20. The charcoal canister solenoid valve 70 may consist of a valve body, a coil, a valve core, and a control power supply. When current passes through the coil, the generated magnetic field attracts or repels the valve core, thereby changing the channel state inside the valve body, and thus opening or closing the second connecting pipe 60 and the external system. An external system can be used to provide a negative pressure state, which can be an engine system, etc. For example, the engine system can provide a negative pressure state through the intake manifold. When the charcoal canister 20 is in a desorbed state, the solenoid valve 111 connects the first pipe 120 and the third pipe 140, thereby allowing gas to enter the fuel system 2 from the external environment through the third pipe 140. The charcoal canister solenoid valve 70 connects the second connecting pipe 60 and the external system, thereby allowing the mixed gas in the charcoal canister 20 to enter the external system through the second connecting pipe 60. This mixed gas may include air and fuel vapor. The external system provides a negative pressure state, and the fuel vapor and air mixture adsorbed and stored in the charcoal canister 20 enters the external system through the second connecting pipe 60. When the external system is an engine system, the fuel vapor enters the engine system for combustion and consumption, and the gas from the external environment enters the fuel system 2 through the third pipe 140 to balance the pressure between the fuel system 2 and the external environment. Therefore, the charcoal canister solenoid valve 70 and solenoid valve 111 can cooperate with each other to desorb the fuel vapor adsorbed and stored in the charcoal canister 20, so that the charcoal canister 20 can regain its adsorption capacity after adsorbing enough fuel vapor, thereby improving the adsorption capacity of the fuel system 2 for fuel vapor and further reducing the risk of fuel vapor being emitted into the external environment.

[0044] In some embodiments, the fuel system 2 further includes a dust filter 50, through which the third pipe 140 is connected to the external environment. Thus, when gas from the external environment enters the third pipe 140, it can first be filtered by the dust filter 50. The dust filter 50 can block impurities in the gas, such as dust particles, thereby reducing the risk of dust from the external environment entering the third pipe 140 and components such as the fuel tank 10, which could lead to malfunctions in the fuel system 2.

[0045] In some embodiments, the pressure balancing valve assembly 110 includes a solenoid valve 111, a first pressure balancing valve 112, a second pressure balancing valve 113, a first balancing pipe 114, and a second balancing pipe 115. The solenoid valve 111 is connected to the first pipe 120, the second pipe 130, and the third pipe 140, respectively. The solenoid valve 111 is configured to open or close the first pipe 120 and the third pipe 140, and to open or close the second pipe 130 and the third pipe 140. The first pressure balancing valve 112 is located in the first balancing pipe 114, and the second pressure balancing valve 113 is located in the second balancing pipe 115. The first balancing pipe 114 and the second balancing pipe 115 are connected to the first pipe 120 and the second pipe 130, respectively. Exemplarily, the first pipe 120 and the second pipe 130 can be arranged side by side, and the first balancing pipe 114 and the second balancing pipe 115 can be connected to the first pipe 120 and the second pipe 130, respectively, through the side walls of the first pipe 120 and the second pipe 130. Therefore, the solenoid valve 111 can open or close the first pipe 120 and the third pipe 140, as well as the second pipe 130 and the third pipe 140. The first pressure balancing valve 112 and the second pressure balancing valve 113 can open or close the first pipe 120 and the second pipe 130 respectively. Depending on the different operating states of the fuel system 2, at least one of them can be opened to balance the pressure of the first pipe 120 and the third pipe 140. This allows the pressure balancing valve group 110 to more flexibly balance the air pressure between the first pipe 120 and the third pipe 140, as well as between the fuel tank 10 and the external environment.

[0046] In some embodiments, the integrated valve 40 further includes a fourth conduit 150 and a fifth conduit 160. One end of the fourth conduit 150 is connected to a solenoid valve 111, and the other end is connected to a third conduit 140. One end of the fifth conduit 160 is connected to the fourth conduit 150, and the other end is connected to a second conduit 130. At least a portion of the diameter of the fifth conduit 160 is different from the diameter of the remaining portion. The fourth conduit 150 is provided with an air pump 151 for generating pressure. The solenoid valve 111 is configured to open or close the first conduit 120 and the fourth conduit 150. The air pump 151 can receive gas from the end of the fourth conduit 150 away from the solenoid valve 111 and pump the gas to the end of the fourth conduit 150 connected to the solenoid valve 111. Therefore, when the solenoid valve 111 connects the first pipe 120 and the fourth pipe 150, the gas pumped by the air pump 151 can enter the first pipe 120 and the space connected to it through the solenoid valve 111. This facilitates the air pump 151 to apply pressure to the first pipe 120, etc., and makes it easier for the integrated valve 40 to cooperate with other components to perform airtightness checks and other related tests on related systems, such as the fuel system 2, enabling the integrated valve 40 to achieve more functions. When the solenoid valve 111 connects the second pipe 130 and the third pipe 140 and closes the first pipe 120 and the fourth pipe 150, and the air pump 151 is in the start state, the gas pumped by the air pump 151 can circulate through the path of the fourth pipe 150, the fifth pipe 160, the second pipe 130, the solenoid valve 111, the third pipe 140, and the fourth pipe 150. This allows for further airtightness tests and air pump 151 current tests in conjunction with the portion of the fifth pipe 160 with a diameter different from the others, to detect leaks in the fuel system 2.

[0047] In some embodiments, the solenoid valve 111 is used to selectively open the first pipe 120 and the third pipe 140 and close the second pipe 130 and the third pipe 140, or close the first pipe 120 and the third pipe 140 and open the second pipe 130 and the third pipe 140, or open the first pipe 120 and the fourth pipe 150 and close the second pipe 130 and the fourth pipe 150. It is understood that the solenoid valve 111 can be used to connect the first pipe 120 and the third pipe 140, the second pipe 130 and the third pipe 140, and the first pipe 120 and the fourth pipe 150, and when the solenoid valve 111 connects two of the first pipe 120, the second pipe 130, the third pipe 140, and the fourth pipe 150, it can be used to close any two of the remaining four. This allows the integrated valve 40 to more flexibly select the internal passage to coordinate gas flow, thereby more conveniently regulating the internal and external gas pressures of the fuel system 2, and further reducing the risk of fuel vapor in the charcoal canister 20 evaporating into the external environment.

[0048] In some embodiments, the first pipe 120 is equipped with a first pressure sensor; and / or, the fifth pipe 160 is equipped with a second pressure sensor. When the solenoid valve 111 closes the first pipe 120 and the third pipe 140, the first pressure sensor can detect the air pressure in the first pipe 120. When the solenoid valve 111 opens the first pipe 120 and the third pipe 140, the first pressure sensor can detect the air pressure in the third pipe 140 and the first pipe 120. When the solenoid valve 111 opens the second pipe 130 and the third pipe 140 and closes the first pipe 120 and the fourth pipe 150, the second pressure sensor can detect the air pressure in the fifth pipe 160, thereby facilitating the understanding of the air pressure status in the aforementioned circulation path. Thus, the first and second pressure sensors allow the operator to understand the air pressure status of different parts of the integrated valve 40 under different states, thereby facilitating the operator to perform corresponding actions based on different air pressure conditions.

[0049] In summary, this application provides a fuel system 2 including: a fuel tank 10, a charcoal canister 20, a first connecting pipe 30, and an integrated valve 40. The fuel tank 10 is directly connected to the charcoal canister 20 through the first connecting pipe 30. The integrated valve 40 includes a pressure balancing valve assembly 110, a first pipe 120, a second pipe 130, and a third pipe 140. The first pipe 120 is connected to the pressure balancing valve assembly 110 and the charcoal canister 20, and the third pipe 140 is connected to the pressure balancing valve assembly 110 and the external environment. The pressure balancing valve assembly 110 is configured to open or close the first pipe 120 and the second pipe 130, open or close the first pipe 120 and the third pipe 140, and open or close the second pipe 130 and the third pipe 140 to regulate the air pressure state of the fuel tank 10. Therefore, the fuel system 2 can regulate the air pressure between the charcoal canister 20, the fuel tank 10 directly connected to the charcoal canister 20, and the external environment through the integrated valve 40, reducing the risk of fuel vapor in the charcoal canister 20 evaporating into the external environment. Since the fuel tank 10 is directly connected to the charcoal canister 20, there is no need to install an isolation device between the charcoal canister 20 and the fuel tank 10 to restrict fuel vapor from entering the charcoal canister 20 from the fuel tank 10, thus reducing the risk of the isolation device occupying a large installation space and forcing a reduction in the volume of the fuel tank 10. Compared to other fuel systems, the fuel system 2 provided in this application can reduce the evaporation of fuel vapor in the charcoal canister 20 into the external environment, while providing more usable space in the fuel tank 10.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fuel system, characterized in that, The fuel system includes: a fuel tank, a charcoal canister, a first connecting pipe, and an integrated valve, wherein the fuel tank is directly connected to the charcoal canister through the first connecting pipe; The integrated valve includes a pressure balancing valve assembly, a first pipe, a second pipe, and a third pipe. The first pipe is connected to the pressure balancing valve assembly and the carbon canister, and the third pipe is connected to the pressure balancing valve assembly and the external environment. The pressure balancing valve assembly is configured to open or close the first pipe and the second pipe, open or close the first pipe and the third pipe, and open or close the second pipe and the third pipe to regulate the air pressure state of the oil tank. The pressure balancing valve assembly includes a first balancing pipe, a first pressure balancing valve, and a solenoid valve. The first pressure balancing valve is disposed in the first balancing pipe, and the first balancing pipe is connected to the first pipe and the second pipe respectively. When the oil tank pressure is greater than the external ambient pressure, the solenoid valve opens the second pipe and the third pipe, and the first pressure balancing valve opens in one direction to make the first pipe, the first balancing pipe, and the second pipe open, so that the oil tank pressure is the same as the external environment. When the fuel tank pressure is greater than the external ambient pressure, and the first difference between the fuel tank pressure and the external ambient pressure is greater than a first preset difference threshold, the first pressure balancing valve opens at a first opening degree; when the fuel tank pressure is greater than the external ambient pressure, and the first difference between the fuel tank pressure and the external ambient pressure is greater than a second preset difference threshold, the first pressure balancing valve opens at a second opening degree; the first preset difference threshold is greater than the second preset difference threshold, and the first opening degree is greater than the second opening degree; The pressure balancing valve assembly includes a second balancing pipe and a second pressure balancing valve. The second pressure balancing valve is disposed in the second balancing pipe, and the second balancing pipe is connected to the first pipe and the second pipe respectively. When the oil tank pressure is lower than the external ambient pressure, the solenoid valve opens the second pipe and the third pipe, and the second pressure balancing valve opens in one direction to connect the second pipe, the second balancing pipe and the first pipe, so that the oil tank pressure is the same as the external ambient pressure.

2. The fuel system according to claim 1, characterized in that, One end of the first pipe is connected to the solenoid valve, and the other end is connected to the charcoal canister; one end of the third pipe is connected to the solenoid valve, and the other end is connected to the external environment. When the oil tank is in the oil-filling state, the solenoid valve opens the first pipe and the third pipe to make the air pressure in the oil tank the same as the external ambient air pressure.

3. The fuel system according to claim 1, characterized in that, The pressure balancing valve assembly includes a solenoid valve. One end of the first pipe is connected to the solenoid valve, and the other end is connected to the charcoal canister. One end of the third pipe is connected to the solenoid valve, and the other end is connected to the external environment. The fuel system also includes a second connecting pipe and a charcoal canister solenoid valve. The charcoal canister solenoid valve is connected to the second connecting pipe, and the charcoal canister solenoid valve is configured to open or close the second connecting pipe and the external system. When the charcoal canister is in the desorption state, the solenoid valve connects the first pipe and the third pipe, the charcoal canister solenoid valve connects the second connecting pipe and the external system, and under the negative pressure provided by the external system, it draws in the gas inside the charcoal canister.

4. The fuel system according to claim 1, characterized in that, The fuel system also includes a dust filter, and the third conduit is connected to the external environment through the dust filter.

5. The fuel system according to claim 1, characterized in that, The pressure balancing valve assembly includes a solenoid valve, a first pressure balancing valve, a second pressure balancing valve, a first balancing pipe, and a second balancing pipe. The solenoid valve is connected to the first pipe, the second pipe and the third pipe respectively. The solenoid valve is configured to open or close the first pipe and the third pipe, and to open or close the second pipe and the third pipe. The first pressure balancing valve is installed in the first balancing pipe, and the second pressure balancing valve is installed in the second balancing pipe. The first balancing pipe and the second balancing pipe are respectively connected to the first pipe and the second pipe.

6. The fuel system according to claim 5, characterized in that, The integrated valve further includes a fourth pipe and a fifth pipe. One end of the fourth pipe is connected to the solenoid valve and the other end is connected to the third pipe. One end of the fifth pipe is connected to the fourth pipe and the other end is connected to the second pipe. At least a portion of the diameter of the fifth pipe is different from the diameter of the remaining portion. The fourth pipe is equipped with an air pump for generating pressure. The solenoid valve is configured to open or close the first pipe and the fourth pipe.

7. A vehicle, characterized in that, The vehicle includes the fuel system as described in any one of claims 1 to 6.

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