Fuel system and vehicle

Abstract

The invention discloses a fuel system and a vehicle. Belongs to the technical field of vehicles, and comprises a fuel tank, a fuel filling main pipe, a fuel filling one-way valve, a fuel filling circulating pipe, a rollover valve, an oil-gas separator, a fuel tank vent valve, a fuel filling quantity limiting control valve and a carbon tank, the fuel tank is provided with a fuel storage cavity, the fuel filling main pipe is communicated with the fuel storage cavity through the fuel filling one-way valve, and one end of the fuel filling circulating pipe is communicated with the fuel filling main pipe; the oil-gas separator is communicated with the oil storage cavity through the oil tank vent valve and the oil filling quantity limiting control valve, and is further communicated with the carbon tank, so that liquid fuel oil can be prevented from leaking to the carbon tank under the condition of ensuring smooth oil filling and normal operation of an OBD (On-Board Diagnostic), the carbon tank is prevented from losing efficacy, and the service life of the carbon tank is prolonged. Therefore, the emission control performance and economical efficiency of the vehicle are improved, environmental pollution and energy waste caused by the fuel oil system are reduced, user claims and complaints caused by failure of the carbon tank are reduced, and the product competitiveness of the fuel oil system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a fuel system and a vehicle. Background Art

[0002] The National VI Emission Regulations have put forward more stringent requirements on the evaporative emissions of automobile fuel. In the relevant technology, the fuel tank is connected to the carbon canister through a circulation pipe to absorb the gaseous fuel formed by evaporation. However, when the vehicle is in use, liquid fuel may also enter the carbon canister through the circulation pipe, causing environmental pollution and energy waste. At the same time, the failure of the carbon canister caused by oil inflow will also trigger claims and user complaints in the after-sales market. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present invention provides a fuel system that can prevent liquid fuel from leaking into a carbon canister and prevent the carbon canister from failing.

[0004] The invention also provides a vehicle with the fuel system.

[0005] According to an embodiment of the present invention, the fuel system includes: a fuel tank, the fuel tank having an oil storage chamber; a refueling main pipe and a refueling one-way valve, the refueling main pipe is connected to the oil storage chamber through the refueling one-way valve; a refueling circulation pipe and a rollover valve, the refueling circulation pipe is passed through the fuel tank, one end of the refueling circulation pipe is connected to the refueling main pipe, and the other end of the refueling circulation pipe is connected to the oil storage chamber through the rollover valve; an oil-gas separator, a fuel tank vent valve, a refueling limit control valve and a carbon canister, the oil-gas separator having a first interface, a second interface and an air outlet, the first interface is connected to the oil storage chamber through the fuel tank vent valve, the second interface is connected to the oil storage chamber through the refueling limit control valve, and the air outlet is connected to the carbon canister.

[0006] According to the fuel system of the embodiment of the present invention, one end of the refueling circulation pipe is connected to the refueling main pipe, the other end of the refueling circulation pipe is connected to the oil storage chamber through the rollover valve, the oil-gas separator is connected to the oil storage chamber through the fuel tank vent valve and the refueling limit control valve, and the oil-gas separator is also connected to the carbon canister. Under the condition of smooth refueling and normal operation of OBD, liquid fuel can be prevented from leaking into the carbon canister and preventing the carbon canister from failing, which is beneficial to improving the emission control performance and economy of the vehicle, reducing environmental pollution and energy waste of the fuel system, and reducing user claims and complaints caused by carbon canister failure, thereby improving the product competitiveness of the fuel system.

[0007] According to some embodiments of the present invention, the closing liquid level height of the rollover valve and the refueling limit control valve is the same.

[0008] According to some embodiments of the present invention, the refueling circulation pipe is not lower than the height of the rollover valve.

[0009] According to some embodiments of the present invention, the rollover valve is disposed at a middle position in the oil storage chamber.

[0010] According to some embodiments of the present invention, the refueling circulation pipe includes: a first pipe section, a second pipe section and a pipe joint, the pipe joint is passed through the fuel tank, one end of the pipe joint located outside the oil storage chamber is connected to the refueling main pipe through the first pipe section, and one end of the pipe joint located inside the oil storage chamber is connected to the rollover valve through the second pipe section.

[0011] According to some embodiments of the present invention, the fuel tank vent valve is higher than the refueling limit control valve.

[0012] According to some embodiments of the present invention, a valve port of the refueling one-way valve is oriented parallel to a width direction of the vehicle.

[0013] According to some embodiments of the present invention, the oil-gas separator is disposed above the fuel tank, and the second interface is lower than the height of the first interface and the air outlet.

[0014] According to some embodiments of the present invention, a diverter baffle is provided in the oil-gas separator, and the diverter baffle is used to block oil from entering the gas outlet.

[0015] A vehicle according to another embodiment of the present invention includes the above-mentioned fuel system.

[0016] According to the vehicle of the embodiment of the present invention, one end of the refueling circulation pipe of its fuel system is connected to the refueling main pipe, and the other end of the refueling circulation pipe is connected to the oil storage chamber through the rollover valve. The oil-gas separator is connected to the oil storage chamber through the fuel tank vent valve and the refueling limit control valve. The oil-gas separator is also connected to the carbon canister. Under the condition of ensuring smooth refueling and normal operation of OBD, liquid fuel can be prevented from leaking into the carbon canister and preventing the carbon canister from failing, which is beneficial to improving the emission control performance and economy of the vehicle, reducing the vehicle's environmental pollution and energy waste, and reducing user claims and complaints caused by carbon canister failure, thereby improving the product competitiveness of the fuel system.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a vehicle and a fuel system thereof according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] Fuel tank 1; fuel storage chamber 11;

[0021] Refueling main pipe 21; fuel tank cap 211; refueling circulation pipe 22; first pipe section 221; second pipe section 222; pipe joint 223;

[0022] Refueling check valve 31; rollover valve 32; fuel tank vent valve 33; refueling limit control valve 34;

[0023] Oil-gas separator 4; first interface 41; second interface 42; gas outlet 43;

[0024] A first connecting pipe 51; a second connecting pipe 52; an adsorption pipe 53; a fuel delivery pipeline 54; a desorption pipe 55; and an atmosphere connecting pipe 56;

[0025] Carbon canister 6; adsorption port 61; desorption port 62; communication port 63;

[0026] Carbon canister flushing solenoid valve 71; Carbon canister ash filter 72; Fuel leak diagnosis module 73;

[0027] Fuel pump assembly 8;

[0028] Fuel system 100;

[0029] Engine 200; intake manifold 201; high pressure fuel rail 202;

[0030] Vehicle 1000. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The fuel system 100 and the vehicle 1000 according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1 As shown, the fuel system 100 includes: a fuel tank 1, a refueling main pipe 21, a refueling one-way valve 31 (ICV valve), a refueling circulation pipe 22, a rollover valve 32 (ROV valve), an oil-gas separator 4, a fuel tank vent valve 33 (GVV valve), a refueling limit control valve 34 (FLVV valve) and a carbon canister 6. The fuel tank 1 has an oil storage chamber 11. The refueling main pipe 21 is connected to the oil storage chamber 11 through the refueling one-way valve 31. The refueling circulation pipe 22 is penetrated by the fuel tank 1. One end of the refueling circulation pipe 22 is connected to the refueling main pipe 21, and the other end of the refueling circulation pipe 22 is connected to the oil storage chamber 11 through the rollover valve 32. The oil-gas separator 4 has a first interface 41, a second interface 42 and an air outlet 43. The first interface 41 is connected to the oil storage chamber 11 through the fuel tank vent valve 33, the second interface 42 is connected to the oil storage chamber 11 through the refueling limit control valve 34, and the air outlet 43 is connected to the carbon canister 6.

[0037] Among them, the fuel tank 1 has an oil storage chamber 11 for storing fuel, and the refueling main pipe 21 is connected to the oil storage chamber 11 through the refueling one-way valve 31. The fuel can flow into the oil storage chamber 11 through the refueling main pipe 21 and the refueling one-way valve 31, while the fuel in the oil storage chamber 11 is difficult to flow back into the refueling main pipe 21 through the refueling one-way valve 31.

[0038] The refueling circulation pipe 22 is arranged in the fuel tank 1, and one end of the refueling circulation pipe 22 located outside the oil storage chamber 11 is connected to the refueling main pipe 21, and the other end of the refueling circulation pipe 22 located inside the oil storage chamber 11 is connected to the oil storage chamber 11 through a rollover valve 32, and the valve core of the rollover valve 32 is a float structure that can be opened and closed.

[0039] When the fuel level in the oil storage chamber 11 is lower than the rollover valve 32 and the vehicle 1000 is driving or parked normally, the rollover valve 32 opens to ensure smooth fuel filling during refueling and to ensure the normal operation of the OBD (On-Board Diagnostics) of the vehicle 1000. In addition, when the refueling check valve 31 fails, causing the fuel in the oil storage chamber 11 to enter the refueling main pipe 21 through the refueling check valve 31, the refueling circulation pipe 22 can guide the fuel in the refueling main pipe 21 into the rollover valve 32 to flow back into the oil storage chamber 11, and because the refueling circulation pipe 22 is not connected to the carbon canister 6, the liquid fuel in the refueling circulation pipe 22 can be prevented from entering the carbon canister 6, thereby preventing the carbon canister 6 from failing.

[0040] When the vehicle 1000 rolls over or the fuel level in the fuel storage chamber 11 is higher than the rollover valve 32, the rollover valve 32 automatically closes to prevent the fuel in the fuel tank 1 from flowing into the refueling circulation pipe 22 through the rollover valve 32, thereby avoiding fuel leakage.

[0041] The oil-gas separator 4 is arranged on the top outer side of the fuel tank 1. The oil-gas separator 4 has a first interface 41, a second interface 42 and an air outlet 43. The first interface 41 is connected to the oil storage chamber 11 through the oil tank vent valve 33, the second interface 42 is connected to the oil storage chamber 11 through the refueling limit control valve 34, and the air outlet 43 is connected to the carbon canister 6. The fuel vapor in the oil storage chamber 11 can enter the oil-gas separator 4 through the oil tank vent valve 33, and then enter the carbon canister 6 through the air outlet 43, so that the carbon canister 6 absorbs the fuel vapor. The refueling limit control valve 34 can be connected to the atmosphere through the oil-gas separator 4 and the carbon canister 6 in turn. When refueling, if the fuel liquid level reaches the height of the refueling limit control valve 34, the refueling limit control valve 34 is closed, so that the refueling gun jumps to control the full liquid level H height of the oil storage chamber 11 to avoid over-refueling. When violent shaking causes liquid fuel to enter the oil-gas separator 4 through the fuel tank vent valve 33 or the refueling limit control valve 34, the oil-gas separator 4 can block the liquid fuel from flowing to the outlet 43 to prevent the liquid fuel from entering the carbon canister 6.

[0042] Reference Figure 1 As shown, the first interface 41 can be connected to the fuel tank vent valve 33 through the first connecting pipe 51, the second interface 42 can be connected to the refueling limit control valve 34 through the second connecting pipe 52, and the air outlet 43 can be connected to the carbon canister 6 through the adsorption pipe 53.

[0043] According to the fuel system 100 of the embodiment of the present invention, one end of the refueling circulation pipe 22 is connected to the refueling main pipe 21, and the other end of the refueling circulation pipe 22 is connected to the oil storage chamber 11 through the dump valve 32. The oil-gas separator 4 is connected to the oil storage chamber 11 through the fuel tank vent valve 33 and the refueling limit control valve 34. The oil-gas separator 4 is also connected to the carbon canister 6. Under the condition of ensuring smooth refueling and normal operation of OBD, liquid fuel can be prevented from leaking into the carbon canister 6 and preventing the carbon canister 6 from failing, which is beneficial to improving the emission control performance and economy of the vehicle 1000, reducing environmental pollution and energy waste of the fuel system 100, and reducing user claims and complaints caused by the failure of the carbon canister 6, thereby improving the product competitiveness of the fuel system 100.

[0044] In some embodiments of the present invention, reference Figure 1 As shown, the closing liquid level height of the tip-over valve 32 and the refueling limit control valve 34 is the same, the tip-over valve 32 and the refueling limit control valve 34 can be arranged at the same height, and the tip-over valve 32 and the refueling limit control valve 34 can be the same height as the full liquid level surface H of the oil storage chamber 11, so as to ensure smooth refueling while accurately controlling the full liquid level surface H height of the oil storage chamber 11 during refueling.

[0045] It can be understood that when the refueling limit control valve 34 is flush with the full liquid level H and the rollover valve 32 is higher than the height of the oil limit control valve, in the refueling state, if the fuel reaches the full liquid level H, the refueling limit control valve 34 is closed, while the rollover valve 32 is still open and has a certain air permeability, resulting in a delayed jump of the refueling gun, and the fuel in the oil storage chamber 11 will exceed the full liquid level H, and the risk of liquid fuel entering the carbon canister 6 becomes higher.

[0046] When the refueling limit control valve 34 is flush with the full liquid level H and the tip-over valve 32 is lower than the oil limit control valve, in the refueling state, when the fuel reaches the tip-over valve 32 height but does not reach the full liquid level H height, the tip-over valve 32 is closed, which will cause the exhaust of the oil storage chamber 11 to be negatively affected, affecting the refueling efficiency. In addition, if the tip-over valve 32 is closed below the full liquid level H height, it will affect the air permeability during OBD diagnosis.

[0047] In some embodiments of the present invention, the closing liquid level heights of the rollover valve 32 and the refueling limit control valve 34 are the same, and the spacing between the rollover valve 32 and the refueling limit control valve 34 is less than or equal to 80 mm. When the fuel in the oil storage chamber 11 shakes, the rollover valve 32 and the refueling limit control valve 34, which are spaced closer together, can be opened and closed synchronously to avoid OBD diagnostic errors.

[0048] It is understandable that if the rollover valve 32 is far away from the refueling limit control valve 34, when the fuel in the oil storage chamber 11 shakes, the inclined fuel liquid level may cause one of the rollover valve 32 and the refueling limit control valve 34 to be located above the fuel liquid level and the other to be located below the fuel liquid level, thereby causing the rollover valve 32 and the refueling limit control valve 34 to have different opening and closing states, affecting the air permeability during OBD diagnosis.

[0049] In some embodiments of the present invention, reference Figure 1 As shown, the refueling circulation pipe 22 is not lower than the height of the rollover valve 32, that is, the refueling circulation pipe 22 can be located at the same height as the rollover valve 32, or at least a portion of the refueling circulation pipe 22 is higher than the height of the rollover valve 32, so that when the fuel enters the refueling circulation pipe 22, the fuel can flow to the rollover valve 32 under the action of gravity, and enter the oil storage chamber 11 through the rollover valve 32, so as to avoid the fuel being retained in the refueling circulation pipe 22, prevent the retained fuel from affecting the air permeability of the refueling circulation pipe 22, and avoid it affecting the air permeability during OBD diagnosis.

[0050] In some embodiments of the present invention, reference Figure 1 As shown, the rollover valve 32 is arranged in the middle position of the oil storage chamber 11 to reduce the influence of the swaying of the fuel liquid level on the opening and closing of the rollover valve 32 .

[0051] Specifically, when the rollover valve 32 is arranged in the middle position of the oil storage chamber 11, in the width direction (Y direction) of the vehicle 1000, the rollover valve 32 can be at the same distance from the side walls on the left and right sides of the oil storage chamber 11, and in the length direction (X direction) of the vehicle 1000, the rollover valve 32 can be at the same distance from the side walls on the front and rear sides of the oil storage chamber 11. When the fuel level in the oil storage chamber 11 shakes, the height change of the fuel level in the middle position of the oil storage chamber 11 is small, thereby reducing the impact of the shaking of the fuel level in the oil storage chamber 11 on the opening and closing of the rollover valve 32, and avoiding the repeated opening and closing of the rollover valve 32 to cause OBD diagnostic errors.

[0052] In some embodiments of the present invention, reference Figure 1 As shown, the refueling circulation pipe 22 includes: a first pipe section 221, a second pipe section 222 and a pipe joint 223. The pipe joint 223 is penetrated through the fuel tank 1. The end of the pipe joint 223 located outside the oil storage chamber 11 is connected to the refueling main pipe 21 through the first pipe section 221, and the end of the pipe joint 223 located inside the oil storage chamber 11 is connected to the rollover valve 32 through the second pipe section 222.

[0053] Specifically, the pipe joint 223 can be a double-headed male joint, which can be penetrated and fixed to the fuel tank 1 by welding, bonding, etc., and sealed with the fuel tank 1 at the place where it penetrates the fuel tank 1. One end of the first pipe section 221 is connected to the refueling main pipe 21, and the other end of the first pipe section 221 is sleeved on the male joint of the pipe joint 223 located outside the oil storage chamber 11. One end of the second pipe section 222 is sleeved on the male joint of the pipe joint 223 located inside the oil storage chamber 11, and the rollover valve 32 is plugged into the other end of the second pipe section 222. By splitting the refueling circulation pipe 22 into the first pipe section 221, the second pipe section 222 and the pipe joint 223, it is more convenient to assemble the shorter second pipe section 222 into the oil storage chamber 11, so as to reduce the difficulty of assembling the refueling circulation pipe 22.

[0054] In some embodiments of the present invention, reference Figure 1 As shown, the fuel tank vent valve 33 is higher than the height of the refueling limit control valve 34. Since the height of the refueling limit control valve 34 determines the height of the full liquid level H of the oil storage chamber 11 during refueling, the fuel tank vent valve 33 is higher than the height of the full liquid level H of the oil storage chamber 11 to reduce the risk of liquid fuel entering the oil-gas separation through the fuel tank vent valve 33 during shaking, thereby reducing the risk of liquid fuel entering the carbon canister 6. In addition, when the fuel tank vent valve 33 is higher than the height of the refueling limit control valve 34, after the refueling gun jumps, it can be ensured that the fuel tank vent valve 33 can normally discharge the fuel vapor in the oil storage chamber 11.

[0055] In some embodiments of the present invention, reference Figure 1 As shown, the valve opening of the refueling check valve 31 is oriented parallel to the width direction of the vehicle 1000 , thereby reducing the impact of the fuel in the oil storage chamber 11 on the valve opening of the refueling check valve 31 and reducing the risk of the fuel in the oil storage chamber 11 entering the refueling main pipe 21 through the refueling check valve 31 .

[0056] It can be understood that when the vehicle 1000 is driving normally, the frequency of acceleration change of the vehicle 1000 in its length direction (front and back) is relatively high, and the frequency of acceleration change of the vehicle 1000 in its width direction (left and right) is relatively low. Therefore, the fuel in the oil storage chamber 11 usually swings back and forth in the length direction of the vehicle 1000. When the valve port of the refueling check valve 31 is oriented parallel to the width direction of the vehicle 1000, the frequency of impact of the valve port of the refueling check valve 31 by the fuel swinging back and forth can be reduced, and the risk of the cover plate at the valve port of the refueling check valve 31 being flushed open by the fuel is reduced, which is beneficial to reduce the risk of fuel leakage from the refueling check valve 31 to the refueling main pipe 21.

[0057] In some embodiments of the present invention, the oil-gas separator 4 is arranged above the fuel tank 1, and the second interface 42 is lower than the height of the first interface 41 and the air outlet 43, so that the liquid fuel in the oil-gas separator 4 can flow back to the oil storage chamber 11 through the second interface 42 and the refueling limit control valve 34.

[0058] Specifically, the oil-gas separator 4 is arranged above the fuel tank 1, which can reduce the risk of liquid fuel entering the oil-gas separator 4. At the same time, the second interface 42 can be located at the lowest position of the oil-gas separator 4. After the liquid fuel enters the oil-gas separator 4, it can flow into the refueling limit control valve 34 through the second interface 42, and then flow back to the oil storage chamber 11 through the refueling limit control valve 34, so as to reduce the accumulation of liquid fuel in the oil-gas separator 4 and reduce the risk of liquid fuel entering the carbon canister 6.

[0059] In some embodiments of the present invention, a diverter baffle is provided in the oil-gas separator 4, and the diverter baffle is used to block the oil from entering the outlet 43. The diverter baffle can be a baffle that is bent and extended and has an air vent. The diverter baffle can form a maze structure in the oil-gas separator 4 to block the liquid fuel. The gaseous fuel can enter the outlet 43 through the air vent of the diverter baffle and then be adsorbed by the carbon canister 6. The diverter baffle can block the liquid fuel from entering the outlet 43. That is to say, when dynamic leakage occurs in the oil storage chamber 11 under harsh working conditions, the diverter baffle can greatly reduce the liquid fuel accumulated in the oil-gas separator 4, and make the oil flow back to the oil storage chamber 11 from the second interface 42 and the refueling limit control valve 34, so as to prevent the liquid fuel from flowing to the end of the carbon canister 6 and prevent the carbon canister 6 from failing to fill with oil.

[0060] In some embodiments of the present invention, reference Figure 1 As shown, the carbon canister 6 has an adsorption port 61, a desorption port 62 and a communication port 63. The adsorption port 61 is communicated with the gas outlet 43 of the oil-gas separator 4. The gaseous fuel in the oil-gas separator 4 can enter the carbon canister 6 through the gas outlet 43 and the adsorption port 61 in sequence to be adsorbed by the carbon canister 6. The desorption port 62 is communicated with the intake manifold 201 of the engine 200. The gaseous fuel adsorbed by the carbon canister 6 can enter the intake manifold 201 through the desorption port 62 to achieve desorption of the gaseous fuel. The gas outlet 43 is communicated with the atmosphere to balance the air pressure in the carbon canister 6 and the oil storage chamber 11.

[0061] Specifically, the adsorption port 61 is connected to the air outlet 43 of the oil-gas separator 4 through the adsorption tube 53, the desorption port 62 is connected to the intake manifold 201 through the desorption tube 55 and the carbon canister flushing solenoid valve 71 in turn, the connecting port 63 is connected to the atmosphere through the atmospheric connecting tube 56, and a carbon canister ash filter 72 may be provided at the end of the atmospheric connecting tube 56 away from the connecting port 63. The carbon canister ash filter 72 can be used to filter dust and impurities in the atmosphere. A fuel leakage diagnosis module 73 may also be provided between the carbon canister ash filter 72 and the connecting port 63. The fuel leakage diagnosis module 73 can be used to diagnose whether there is fuel leakage at the connecting port 63 of the carbon canister 6.

[0062] In some embodiments of the present invention, reference Figure 1As shown, the fuel system 100 further includes: a fuel tank cap 211, which is disposed at one end of the refueling pipe 21 away from the fuel tank 1. When refueling, the fuel tank cap 211 is opened, and when the fuel tank cap 211 is closed, foreign matter can be prevented from entering the refueling pipe 21.

[0063] Reference Figure 1 As shown, the fuel system 100 further includes: a fuel pump assembly 8, which is at least partially disposed in the oil storage chamber 11, and is connected to a high-pressure oil rail 202 of an engine 200 of the vehicle 1000 through a fuel delivery pipeline 54, and the fuel pump assembly 8 can pump the fuel in the oil storage chamber 11 to the high-pressure oil rail 202 to provide fuel for the operation of the engine 200. The fuel pump assembly 8 can be integrated with an oil level sensor, and the oil level sensor can detect the height of the fuel liquid level in the oil storage chamber 11.

[0064] According to the fuel system 100 of the embodiment of the present invention, when the fuel entering the refueling circulation pipe 22 is caused by damage, jamming, failure, or over-refueling of the refueling check valve 31, the liquid fuel can be prevented and avoided from entering the carbon canister 6 through the refueling circulation pipe 22, thereby improving the reliability of the fuel system 100 and the vehicle 1000, improving product quality, and reducing claims in the aftermarket for the problem of the carbon canister 6 entering the oil due to damage and failure of the refueling check valve 31. At the same time, since the risk of the carbon canister 6 entering the oil is relatively low, the arrangement height of the carbon canister 6 in the whole vehicle has a wider range of flexible options, which can reduce the difficulty of the arrangement of the carbon canister 6 in the whole vehicle. In addition, the gaseous fuel adsorbed by the carbon canister 6 can be sucked into the intake system of the engine 200 to participate in the combustion process, so as to realize the function of the vehicle-mounted oil and gas recovery system (ORVR).

[0065] A vehicle 1000 according to another embodiment of the present invention includes the fuel system 100 of the above embodiment.

[0066] According to the vehicle 1000 of the embodiment of the present invention, one end of the refueling circulation pipe 22 of the fuel system 100 is connected to the refueling main pipe 21, and the other end of the refueling circulation pipe 22 is connected to the oil storage chamber 11 through the rollover valve 32. The oil-gas separator 4 is connected to the oil storage chamber 11 through the fuel tank vent valve 33 and the refueling limit control valve 34. The oil-gas separator 4 is also connected to the carbon canister 6. Under the condition of ensuring smooth refueling and normal operation of OBD, liquid fuel can be prevented from leaking into the carbon canister 6 and preventing the carbon canister 6 from failing, which is beneficial to improving the emission control performance and economy of the vehicle 1000, reducing environmental pollution and energy waste caused by the vehicle 1000, and reducing user claims and complaints caused by the failure of the carbon canister 6, thereby improving the product competitiveness of the fuel system 100.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fuel system, characterized in that: include: A fuel tank (1), wherein the fuel tank (1) has a fuel storage chamber (11); A refueling main pipe (21) and a refueling one-way valve (31), wherein the refueling main pipe (21) is connected to the oil storage chamber (11) through the refueling one-way valve (31); a refueling circulation pipe (22) and a rollover valve (32), wherein the refueling circulation pipe (22) is arranged through the fuel tank (1), one end of the refueling circulation pipe (22) is communicated with the refueling main pipe (21), and the other end of the refueling circulation pipe (22) is communicated with the oil storage chamber (11) through the rollover valve (32); An oil-gas separator (4), an oil tank vent valve (33), a refueling limit control valve (34) and a carbon canister (6); the oil-gas separator (4) has a first interface (41), a second interface (42) and an air outlet (43); the first interface (41) is connected to the oil storage chamber (11) through the oil tank vent valve (33); the second interface (42) is connected to the oil storage chamber (11) through the refueling limit control valve (34); and the air outlet (43) is connected to the carbon canister (6).

2. The fuel system according to claim 1, characterized in that: The closing liquid level height of the rollover valve (32) and the refueling limit control valve (34) is the same.

3. The fuel system according to claim 2, characterized in that: The refueling circulation pipe (22) is not lower than the height of the rollover valve (32).

4. The fuel system according to claim 3, characterized in that: The rollover valve (32) is arranged at a middle position in the oil storage chamber (11).

5. The fuel system according to claim 4, characterized in that: The refueling circulation pipe (22) comprises: a first pipe section (221), a second pipe section (222) and a pipe joint (223); the pipe joint (223) is arranged to pass through the fuel tank (1); one end of the pipe joint (223) located outside the oil storage chamber (11) is connected to the refueling main pipe (21) through the first pipe section (221); and one end of the pipe joint (223) located inside the oil storage chamber (11) is connected to the rollover valve (32) through the second pipe section (222).

6. The fuel system according to claim 2, characterized in that: The fuel tank ventilation valve (33) is higher than the fuel filling limit control valve (34).

7. The fuel system according to claim 1, characterized in that: The valve port of the refueling check valve (31) is oriented parallel to the width direction of the vehicle.

8. The fuel system according to any one of claims 1 to 7, characterized in that: The oil-gas separator (4) is arranged above the fuel tank (1), and the second interface (42) is lower than the height of the first interface (41) and the air outlet (43).

9. The fuel system according to claim 8, characterized in that: The oil-gas separator (4) is provided with a flow dividing baffle plate, and the flow dividing baffle plate is used to prevent oil from entering the gas outlet (43).

10. A vehicle, characterized in that: Comprising a fuel system according to any one of claims 1-9.

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