WO2015039465A1

WO2015039465A1 - Fuel system for vehicle

Info

Publication number: WO2015039465A1
Application number: PCT/CN2014/079645
Authority: WO
Inventors: 刘振山
Original assignee: 北汽福田汽车股份有限公司; 北京智科投资管理有限公司
Priority date: 2013-09-17
Filing date: 2014-06-11
Publication date: 2015-03-26
Also published as: CN104454254B; CN104454254A

Abstract

Disclosed is a fuel system for a vehicle. The fuel system comprises: a fuel tank pump assembly (1), a carbon canister assembly (2) and an adsorption control device (3) provided between the fuel tank pump assembly (1) and the carbon canister assembly (2). The adsorption control device (3) comprises: a buffer chamber (31), wherein the buffer chamber (31) is provided with an inlet (311) and an outlet (312), the inlet (311) of the buffer chamber (31) is connected to the fuel tank pump assembly (1) to receive fuel vapour, and the outlet (312) of the buffer chamber (31) is connected to the carbon canister assembly (2); and a cooling device used for cooling the fuel vapour in the buffer chamber (31). With the adsorption control device (3) provided between the fuel tank pump assembly (1) and the carbon canister assembly (2), the fuel system can reduce fuel vapour flow rate and temperature output per unit time from the adsorption control device (3) to the carbon canister assembly (2) so as to improve the adsorption effect of the carbon canister assembly (2) and reduce emissions.

Description

FUEL SYSTEM FOR VEHICLE This application claims priority to China Prior Application No. 201310425625. 8 filed on September 17, 2013, entitled "Fuel System for Vehicles". Technical field

The present invention relates to the field of automobile construction technology, and more particularly to a fuel system for a vehicle. Background technique

Existing gasoline vehicles generally adopt a fuel evaporative emission control system with a carbon canister as a main component. The canister is directly connected to the tank. However, increasing the rate of gasoline vapor flowing into the canister will reduce the capacity of the canister. In addition, since the process of adsorbing HC by activated carbon in the canister is an exothermic process, when the temperature of the gasoline vapor flowing into the canister is too high, the adsorption capacity of the activated carbon is also greatly reduced, so that the existing fuel evaporative emission control system has a reduced emission. Unstable, easily lead to emissions exceeding the standard. Summary of the invention

The present invention aims to solve at least one of the above technical problems in the prior art to some extent.

Accordingly, it is an object of the present invention to provide a fuel system for a vehicle that can effectively control the flow of fuel vapor output from a fuel tank pump assembly to a canister assembly, thereby improving adsorption of the canister assembly. effect.

According to the fuel system for a vehicle of the present invention, the fuel system includes: a fuel tank oil pump assembly, a carbon canister assembly, and an adsorption control device disposed between the fuel tank oil pump assembly and the canister assembly, The adsorption control device includes: a buffer chamber having an inlet and an outlet, an inlet of the buffer chamber being adapted to be coupled to the fuel tank pump assembly to receive fuel vapor, the outlet of the buffer chamber being adapted to be The canister assembly is connected; and a cooling device for cooling the fuel vapor in the buffer chamber.

According to the fuel system for a vehicle according to an embodiment of the present invention, by providing an adsorption control device between the oil tank oil pump assembly and the canister assembly, oil and gas per unit time output from the adsorption control device to the canister assembly can be reduced. The flow rate and the temperature of the oil and gas can greatly improve the adsorption effect of the carbon canister assembly, reduce emissions, and avoid the problem of excessive emissions.

Further, the fuel system for a vehicle according to the present invention may further have the following additional technical features: According to some embodiments of the present invention, the cooling device includes: a cooling chamber, the cooling chamber being sleeved in the buffer Outside the chamber, the cooling chamber has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are respectively adapted to be connected to a cooling source to form a circulation between the cooling source and the cooling chamber Cooling circuit.

In this way, the cooling source can continuously supply a cooling medium to the cooling chamber, and the cooling medium can take away part of the heat of the buffer chamber by indirect heat exchange, thereby reducing the temperature of the oil and gas in the buffer chamber.

According to some embodiments of the invention, the liquid inlet and the liquid outlet are respectively connected to an engine circulating water of the vehicle.

According to some embodiments of the present invention, the buffer chamber is further provided with an oil return port, and the oil return passage is connected between the oil return port and the oil tank pump assembly.

The liquefied fuel can be returned to the tank oil pump assembly through the oil return passage and re-entered into the circulation, and the buffer chamber is partially liquefied due to partial liquefaction of the oil and gas, so that more oil can be sucked from the fuel tank pump assembly.

According to some embodiments of the present invention, the oil return passage is provided with an oil return check valve, and the oil return check valve is used for single-passing in a direction from the oil return port toward the oil tank pump assembly. The oil return passage.

According to some embodiments of the present invention, the fuel system further includes: a first oil and gas outflow line and a control valve, the first oil and gas outflow line being connected between an outlet of the buffer chamber and the canister assembly The control valve is disposed on the first oil and gas outflow pipeline for controlling the on and off of the first oil and gas outflow pipeline.

According to some embodiments of the invention, the control valve is a solenoid valve.

According to some embodiments of the present invention, the fuel system further includes: a first one-way valve, the first one-way valve being disposed on the first oil and gas outflow line for moving from the buffer chamber toward the carbon The direction of the can assembly is directed to the first oil and gas outflow line.

According to some embodiments of the present invention, the fuel system further includes:

a second oil and gas outflow line and a second one-way valve, wherein the second oil and gas outflow line is connected between the outlet of the buffer chamber and the canister assembly and is arranged in parallel with the first oil and gas outflow line The second check valve is disposed on the second oil and gas outflow pipeline for unidirectionally guiding the second oil and gas outflow pipeline in a direction from the buffer chamber toward the carbon canister assembly; The opening pressure of the second one-way valve is greater than the opening pressure of the first one-way valve.

Therefore, the second oil and gas outflow pipeline constitutes a protection circuit of the first oil and gas outflow pipeline. When the control valve is closed and cannot be normally opened due to a failure or the like, the pressure of the oil and gas in the buffer chamber will gradually increase, when the pressure reaches a certain value. The second check valve will be opened, so that the oil and gas in the buffer chamber can flow to the carbon canister assembly through the second oil and gas outflow pipeline, thereby avoiding damage to the fuel tank oil pump assembly and the buffer chamber due to excessive pressure in the fuel tank pump assembly and the buffer chamber. .

a gas pressure balance line and a third check valve, the gas pressure balance line being connected between the outlet of the buffer chamber and the canister assembly and with the first oil and gas outflow line and the second oil and gas The outflow pipelines are arranged in parallel, and the third one-way valve is disposed on the air pressure balance pipeline for unidirectionally guiding the air pressure in a direction from the carbon canister assembly toward the buffer chamber Balance the pipeline.

Therefore, when the negative pressure in the fuel tank pump assembly and the buffer chamber is too large, the air and/or oil and gas in the canister assembly can be replenished into the buffer chamber and the oil tank pump assembly through the air pressure balance line to avoid the negative pressure. Large, resulting in damage to the buffer chamber and fuel tank pump assembly.

According to some embodiments of the present invention, the first oil and gas outflow line, the second oil and gas outflow line, and the air pressure balance line are connected to the carbon canister assembly through a common line.

The fuel system further includes: a flow meter, the flow meter being disposed on the common line, the flow meter being coupled to an ECU of the vehicle, and the ECU being further coupled to the control valve.

According to some embodiments of the present invention, the fuel system further includes: a third oil and gas outflow line and a flow regulating valve, wherein the third oil and gas outflow line is connected to an outlet of the buffer chamber and the carbon canister assembly The flow regulating valve is disposed on the third oil and gas outflow pipeline for regulating the flow of oil and gas flowing through the third oil and gas outflow pipeline.

According to some embodiments of the present invention, the cooling device is a cooling rod, the cooling rod extends into the buffer chamber, and the cooling rod is adapted to be connected to a cooling source for the cooling rod and the cooling source A circulating cooling circuit is formed between them.

According to some embodiments of the invention, the cooling rod is at least one, and the cooling rod extends in a meandering manner. DRAWINGS

1 is a schematic view of a fuel system in accordance with one embodiment of the present invention;

2 is a schematic view of an adsorption control device in accordance with one embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the terms "inside", "outer", and the like is based on the orientation or positional relationship shown in the drawings, for convenience of description of the present invention and simplified description. It is not intended to be a limitation or limitation of the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first", "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" unless otherwise specifically defined and defined. The terms should be understood in a broad sense. For example, they may be fixed connections, detachable connections, or integrated; they may be mechanical or electrical; they may be directly connected or indirectly connected through an intermediate medium. It is the internal communication of two components or the interaction of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature being directly above and above the second feature, or merely indicating that the first feature is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely indicating that the first feature level is less than the second feature.

A fuel system according to an embodiment of the present invention, which is suitable for a vehicle, and more specifically, a motor vehicle having an internal combustion engine, will be described in detail below with reference to FIGS. 1 and 2.

A fuel system for a vehicle according to an embodiment of the present invention may include a tank oil pump assembly 1, a canister assembly 2, and an adsorption control device 3. It should be understood that both the fuel tank pump assembly 1 and the canister assembly 2 are prior art, so the specific construction and operation of the fuel tank pump assembly 1 and the canister assembly 2 will not be described in detail herein.

As shown in FIG. 1, the adsorption control device 3 is disposed between the oil tank pump assembly 1 and the canister assembly 2 for controlling the flow of oil and gas from the oil tank pump assembly 1 to the canister assembly 2, thereby making the carbon canister Assembly 2 achieves good adsorption and reduces vehicle emissions.

According to an embodiment of the present invention, as shown in Fig. 2, the adsorption control device 3 may include a buffer chamber 31 and a cooling device such as a cooling chamber 32 which will be mentioned later. Specifically, the buffer chamber 31 has an inlet 311 and an outlet 312, and the inlet 311 of the buffer chamber 31 is adapted to be connected to the tank oil pump assembly 1 to receive fuel vapor (referred to as oil and gas) from the tank oil pump assembly 1, the inlet of the buffer chamber 31. The 311 may be directly connected to the fuel tank oil pump assembly 1. Of course, preferably, the inlet 311 of the buffer chamber 31 and the tank oil pump assembly 1 may be indirectly connected by a line. The outlet 312 of the buffer chamber 31 is adapted to be coupled to the canister assembly 2 to output the oil and gas in the buffer chamber 31 to the canister assembly 2.

The buffer chamber 31 is used to buffer the oil and gas from the oil tank pump assembly 1 and reduce the oil and gas rate output to the canister assembly 2, thereby improving the adsorption effect of the canister assembly 2 and reducing emissions. The cooling device is used to cool the fuel vapor in the buffer chamber 31, thereby lowering the temperature of the fuel vapor, thereby further enhancing the adsorption effect of the canister assembly 2.

Thus, according to the fuel system for a vehicle according to the embodiment of the present invention, by providing the adsorption control device 3 between the oil tank oil pump assembly 1 and the canister assembly 2, it is possible to reduce the total output from the adsorption control device 3 to the carbon canister. The oil and gas flow in unit time and the temperature of the oil and gas can greatly improve the adsorption effect of the carbon canister assembly 2, reduce emissions, and avoid the problem of excessive emissions.

According to an embodiment of the present invention, as shown in FIG. 2, the cooling device includes a cooling chamber 32, and the cooling chamber 32 is sleeved in a slow manner. Outside the flush chamber 31, the cooling chamber 32 has a liquid inlet 321 and a liquid outlet 322, respectively, and the liquid inlet 321 and the liquid outlet 322 are respectively adapted to be connected to a cooling source to form a circulating cooling circuit between the cooling source and the cooling chamber 32. . Here, "cooling source" can be understood as a medium source that can provide a cooling medium such as cooling water.

Thus, the cooling source can continuously supply a cooling medium to the cooling chamber 32, and the cooling medium can carry away part of the heat of the buffer chamber 31 by indirect heat exchange, thereby lowering the temperature of the oil and gas in the buffer chamber 31.

In this embodiment, the liquid inlet 321 and the liquid outlet 322 of the cooling chamber 32 may be connected to an engine circulating water passage of the vehicle, for example, to a radiator of the engine.

However, the present invention is not limited thereto. In another embodiment of the present invention, the cooling device is a cooling rod (not shown), and the cooling rod may protrude into the buffer chamber 31 to directly interact with the oil and gas in the buffer chamber 31. Contact heat transfer, taking away part of the heat of the oil and gas, thereby reducing the temperature of the oil and gas. The cooling rod is adapted to be coupled to a cooling source to form a circulating cooling circuit between the cooling rod and the cooling source, the cooling source herein having the same meaning as the cooling source in the embodiment of the cooling chamber 32 described above, and therefore will not be described again.

In this embodiment, the cooling rod is at least one, and the cooling rod preferably extends in a meandering manner. In other words, the cooling rod is serpentine or wavy, which can increase the contact area between the cooling rod and the oil and gas in the buffer chamber 31, and increase heat exchange. effect. In this embodiment, the cooling rod is adapted to be coupled to an engine cycle water circuit of the vehicle, such as to a radiator of the engine.

It should be noted that the cooling method of the oil and gas in the buffer chamber 31 is not limited to the above-described cooling chamber 32 and the cooling rod, and other devices and/or methods that can realize the temperature of the oil and gas in the cooling buffer chamber 31 fall into the present invention. Within the scope of protection.

The oil and gas in the buffer chamber 31 is easily liquefied due to the provision of the cooling device. Therefore, preferably, as shown in FIG. 1 and FIG. 2, the buffer chamber 31 is further provided with a oil return port 313, and an oil return passage 314 is connected between the oil return port 313 and the oil tank oil pump assembly 1, so that the liquefied fuel can be The return oil passage 314 is returned to the tank oil pump assembly 1 and re-entered into the circulation, and since the partial oil and gas is liquefied in the buffer chamber 31, the pressure in the buffer chamber 31 is lowered, so that more oil and gas can be sucked from the tank oil pump assembly 1.

Preferably, the oil return passage 314 is provided with an oil return check valve 315 for guiding the oil return passage 314 in a direction from the oil return port 313 toward the oil tank oil pump assembly 1. In other words, the fuel in the buffer chamber 31 can flow into the oil tank pump assembly 1 through the oil return check valve 315, and the fuel or oil and gas in the oil tank pump assembly 1 cannot flow backward through the oil return check valve 315 into the buffer chamber 31. Inside.

Referring to Figures 1 and 2, the outlet 312 of the buffer chamber 31 is not directly connected to the canister assembly 2, but is indirectly connected through the intermediate line. Specifically, the fuel system may include a first oil and gas outflow line 41 and a control valve 54 connected between the outlet 312 of the buffer chamber 31 and the canister assembly 2, and the control valve 54 is provided at the first The oil and gas outflow line 41 is used to control the on/off of the first oil and gas outflow line 41, that is, the control valve 54 is opened, and the oil and gas in the buffer chamber 31 can flow to the carbon canister assembly through the first oil and gas outflow line 41. 2, if the control valve 54 is closed, the oil Gas cannot flow to the canister assembly 2. Alternatively, the control valve 54 may be a solenoid valve, thereby facilitating control.

Further, the fuel system may further include a first check valve 51, and the first check valve 51 is disposed on the first oil and gas outflow line 41 for unidirectionally guiding in the direction from the buffer chamber 31 toward the canister assembly 2. The oil and gas outflow line 41, by providing the first check valve 51, can prevent the oil and gas in the canister assembly 2 from flowing back to the buffer chamber 31 in the reverse direction. It should be understood that the first check valve 51 and the control valve 54 such as the solenoid valve may be two separate valves that operate independently of each other without affecting each other. However, it will also be appreciated that the first one-way valve 51 and the control valve 54, such as a solenoid valve, may be integrated into one valve, such as a one-way solenoid valve, as will be readily understood by those of ordinary skill in the art.

According to a further embodiment of the present invention, as shown in FIG. 2, the fuel system further includes a second oil and gas outflow line 42 and a second check valve 52. The second oil and gas outflow line 42 is connected to the outlet 312 of the buffer chamber 31 and carbon. The tank assembly 2 is disposed in parallel with the first oil and gas outflow line 41, and the second check valve 52 is disposed on the second oil and gas outflow line 42 for single direction from the buffer chamber 31 toward the canister assembly 2. The guide passes through the second oil and gas outflow line 42. The opening pressure of the second one-way valve 52 is greater than the opening pressure of the first one-way valve 51.

Therefore, the second oil and gas outflow line 42 constitutes a protection circuit of the first oil and gas outflow line 41. When the control valve 54 is closed due to a failure or the like and cannot be normally opened, the pressure of the oil and gas in the buffer chamber 31 will gradually increase. When the pressure reaches a certain value, the second one-way valve 52 will be opened, so that the oil and gas in the buffer chamber 31 can flow to the carbon canister assembly 2 through the second oil-gas outflow line 42 to avoid the tank oil pump assembly 1 and the buffer chamber 31. Excessive pressure causes damage to the fuel tank pump assembly 1 and the buffer chamber 31.

When the control valve 54 is working normally, since the opening pressure of the first check valve 51 is small, the second oil and gas outflow line 42 is closed by the second check valve 52, and the oil and gas flows through the first oil and gas outflow line 41. Go to the canister assembly 2.

Further, the fuel system further includes a gas pressure balance line 43 and a third check valve 53 connected between the outlet 312 of the buffer chamber 31 and the canister assembly 2 and the first oil and gas outflow line 41 and The second oil and gas outflow line 42 is arranged in parallel, that is, the three lines of the air pressure balance line 43, the first oil and gas outflow line 41 and the second oil and gas outflow line 42 are arranged in parallel. The third check valve 53 is provided on the air pressure balance line 43 for unidirectionally controlling the air pressure balance line 43 from the canister assembly 2 toward the buffer chamber 31.

Therefore, when the negative pressure is excessively large in the oil tank pump assembly 1 and the buffer chamber 31, the air and/or oil and gas in the canister assembly 2 can be replenished to the buffer chamber 31 and the oil tank pump assembly 1 through the air pressure balance line 43. Inside, it is avoided that the buffer chamber 31 and the oil tank pump assembly 1 are damaged due to excessive negative pressure.

Referring to Figures 1 and 2, the first oil and gas outflow line 41, the second oil and gas outflow line 42 and the air pressure equalization line 43 are connected to the canister assembly 2 via a common line 45, and the fuel system further includes a flow meter 46, the flow meter 46 is disposed on the common line 45, the flow meter 46 is connected to the ECU 47 (driving computer) of the vehicle, and the ECU 47 is also connected to the control valve 54, so that the ECU 47 is based on the flow signal fed back from the flow meter 46 and the current operation of the vehicle engine. The working condition can control the opening and closing of the control valve 54, thereby realizing the control of the loading amount, so that the performance of the canister assembly 2 is in a better working state, and the carbon can is improved. The adsorption capacity of assembly 2.

It should be noted that, in the examples of FIG. 1 and FIG. 2, the first oil and gas outflow line 41 is a main outflow line, and the line is provided with a control valve 54 and a first check valve 51, but it is understood that In this example, the first oil and gas outflow line 41 can also cancel the control valve 54 and change to the flow regulating valve. The flow regulating valve can open or close the first oil and gas outflow line 41, and the flow regulating valve is open. When it can change its opening degree to adjust the oil and gas flow rate on the first oil and gas outflow pipe 41, thereby better adapting to the carbon canister assembly 2, so that the adsorption effect of the canister assembly 2 is always in an optimal state.

However, the present invention is not limited thereto, and in view of cost reduction and simplification of structure, etc., according to an alternative embodiment of the present invention, the fuel system further includes a third oil and gas outflow line and a flow regulating valve (not shown) That is, in this embodiment, the line connecting the buffer chamber 31 and the canister assembly 2 may be only the third oil and gas outflow line, and the third oil and gas outflow line is connected to the outlet 312 of the buffer chamber 31 and the canister. Between the assemblies 2, a flow regulating valve is disposed on the third oil and gas outflow line for regulating the flow of oil and gas flowing through the third oil and gas outflow line. In this embodiment, a flow meter may be disposed on the third oil and gas outflow line, the flow meter may be connected to the ECU of the vehicle, and the ECU is also connected to the flow regulating valve, so that the ECU according to the flow signal fed back by the flow meter and the current operation of the vehicle engine Working condition, the opening and closing or opening degree of the flow regulating valve can be controlled, thereby achieving precise control of the loading amount, so that the performance of the canister assembly 2 is in a better working state, and the adsorption capacity of the canister assembly 2 is improved.

In general, according to a fuel system of a preferred embodiment of the present invention, the buffer chamber 31 can effectively slow the loading speed of the fuel vapor in the fuel tank, the cooling chamber 32 can effectively reduce the fuel vapor temperature, and the control valve 54 can effectively control the loading of the fuel vapor. The quantity, in order to achieve the purpose of improving the working capacity of the canister assembly 2. A vehicle according to an embodiment of the present invention will be briefly described below.

A vehicle according to an embodiment of the present invention includes a fuel system which is a fuel system according to the above embodiment of the present invention.

It should be understood that other configurations of the vehicle, such as an engine, a transmission, a differential, etc., in accordance with embodiments of the present invention are known in the art and are well known to those of ordinary skill in the art and therefore will not be described in detail herein.

In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Further, various embodiments or examples described in the specification can be joined and combined by those skilled in the art.

Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary. It is to be understood that the invention is susceptible to variations, modifications, alterations and variations of the embodiments described herein.

Claims

claims

1. A fuel system for a vehicle, characterized in that the fuel system includes: a fuel tank pump assembly, a carbon canister assembly, and an adsorption device provided between the fuel tank pump assembly and the carbon canister assembly. Control device, the adsorption control device includes:

A buffer chamber, the buffer chamber has an inlet and an outlet, the inlet of the buffer chamber is adapted to be connected to the fuel tank pump assembly to receive fuel vapor, and the outlet of the buffer chamber is suitable to be connected to the carbon canister assembly; as well as

A cooling device used to cool fuel vapor in the buffer chamber.

2. The fuel system for vehicles according to claim 1, characterized in that the cooling device includes: a cooling chamber, the cooling chamber is set outside the buffer chamber, the cooling chamber has a liquid inlet The liquid inlet and the liquid outlet are respectively adapted to be connected with a cooling source to form a circulating cooling circuit between the cooling source and the cooling chamber.

3. The fuel system for a vehicle according to claim 1, wherein the liquid inlet and the liquid outlet are respectively connected to the engine circulation water path of the vehicle.

4. The fuel system for vehicles according to claim 1, wherein the buffer chamber is further provided with an oil return port, and an oil return channel is connected between the oil return port and the fuel tank oil pump assembly. .

5. The fuel system for vehicles according to claim 4, characterized in that, the oil return channel is provided with an oil return check valve, and the oil return check valve is used to pass along the oil return port. The oil return passage is led in one direction toward the oil tank and oil pump assembly.

6. The fuel system for a vehicle according to claim 1, further comprising: a first oil and gas outflow pipeline and a control valve, the first oil and gas outflow pipeline is connected between the outlet of the buffer chamber and the control valve. Between the carbon canister assemblies, the control valve is provided on the first oil and gas outflow pipeline for controlling on and off of the first oil and gas outflow pipeline.

7. The fuel system for vehicles according to claim 6, wherein the control valve is a solenoid valve.

8. The fuel system for a vehicle according to claim 6, further comprising: a first one-way valve, the first one-way valve is provided on the first oil and gas outflow pipeline for The buffer chamber unidirectionally leads to the first oil and gas outflow pipeline in the direction of the carbon canister assembly.

9. The fuel system for vehicles according to claim 6, further comprising:

a second oil and gas outflow pipeline and a second one-way valve. The second oil and gas outflow pipeline is connected between the outlet of the buffer chamber and the carbon canister assembly and is arranged in parallel with the first oil and gas outflow pipeline. , the second one-way valve is provided on the second oil and gas outflow pipeline for unidirectionally conducting the second oil and gas outflow pipeline in the direction from the buffer chamber toward the carbon canister assembly;

Wherein, the opening pressure of the second one-way valve is greater than the opening pressure of the first one-way valve.

10. The fuel system for a vehicle according to claim 9, further comprising: an air pressure balance pipeline and a third one-way valve, the air pressure balance pipeline being connected between the outlet of the buffer chamber and the Between the carbon canister assembly and in parallel with the first oil and gas outflow pipeline and the second oil and gas outflow pipeline, the third one-way valve is provided on the air pressure balance pipeline for flowing from the The carbon canister assembly leads to the air pressure balance pipeline in one direction toward the buffer chamber.

11. The fuel system for a vehicle according to claim 10, characterized in that the first oil and gas outflow pipeline, the second oil and gas outflow pipeline and the air pressure balance pipeline are connected to all the gas through a common pipeline. The carbon canister assembly is connected, and the fuel system also includes: a flow meter, the flow meter is installed on the common pipeline, the flow meter is connected to the ECU of the vehicle, and the ECU is also connected to the control valve. connected.

12. The fuel system for a vehicle according to claim 1, further comprising: a third oil and gas outflow pipeline and a flow regulating valve, the third oil and gas outflow pipeline is connected to the outlet of the buffer chamber Between the carbon canister assembly and the carbon canister assembly, the flow regulating valve is provided on the third oil and gas outflow pipeline for adjusting the oil and gas flow rate flowing through the third oil and gas outflow pipeline.

13. The fuel system for vehicles according to claim 1, wherein the cooling device is a cooling rod, the cooling rod extends into the buffer chamber, and the cooling rod is adapted to be connected to a cooling source. A circulating cooling loop is formed between the cooling rod and the cooling source.

14. The fuel system for a vehicle according to claim 1, wherein there is at least one cooling rod, and the cooling rod extends in a meandering manner.