Low-emission fuel system and vehicle

Abstract

The utility model relates to a low-emission fuel oil system and a vehicle. The low-emission fuel oil system comprises an oil tank, an oil gas condensation system and a carbon tank. The oil gas condensation system comprises a condensation box and a liquid accumulation box, the condensation box is arranged above the oil tank, a refrigerator is arranged on the condensation box, and the liquid accumulation box is arranged in the condensation box; an oil liquid pipe and a first oil gas pipe are communicated between the liquid accumulation tank and the oil tank, the oil liquid pipe is located at the bottom of the liquid accumulation tank, and a second oil gas pipe is communicated between the liquid accumulation tank and the carbon tank; a first valve, a second valve and a third valve are respectively arranged on the first oil gas pipe, the oil liquid pipe and the second oil gas pipe. According to the scheme, timely pressure relief of the fuel tank is achieved, balance of the internal pressure of the fuel tank is maintained, the running stability of a fuel system is better, liquefaction recovery of oil steam is achieved, oil gas emission of the fuel system is reduced, the load of a carbon tank is reduced, environmental pollution is reduced, the fuel utilization rate is increased, and energy is saved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a low-emission fuel system and a vehicle. Background Art

[0002] With the development of new energy technology and the increasingly stringent requirements for automobile emissions, hybrid vehicles are gradually emerging in the market. Hybrid vehicles are mainly driven by electricity. When the electricity is exhausted or in other special circumstances, the engine will be driven by fuel. Therefore, the fuel in hybrid vehicles is unused most of the time. Due to shaking or temperature rise during driving, the fuel in the fuel tank will continue to evaporate, generating a large amount of fuel vapor in the tank. Excessive fuel vapor can easily cause the carbon canister to be saturated, which is insufficient to completely absorb the evaporated oil and gas, causing the oil and gas to be directly discharged into the atmosphere, resulting in energy waste and environmental pollution. Utility Model Content

[0003] Based on this, the utility model provides a low-emission fuel system and a vehicle to solve the problem that the existing vehicle fuel system has high oil and gas emissions, resulting in energy waste and environmental pollution.

[0004] On the one hand, the utility model provides a low-emission fuel system, including a fuel tank, an oil-gas condensation system and a carbon canister;

[0005] The oil-gas condensation system comprises a condensation tank and a liquid accumulation tank, wherein the condensation tank is arranged above the oil tank, a refrigerator is arranged on the condensation tank, and the liquid accumulation tank is arranged inside the condensation tank;

[0006] An oil pipe and a first oil-gas pipe are connected between the liquid storage box and the oil tank, and the oil pipe is located at the bottom of the liquid storage box, and a second oil-gas pipe is connected between the liquid storage box and the carbon canister;

[0007] The first oil and gas pipe, the oil pipe and the second oil and gas pipe are respectively provided with a first valve, a second valve and a third valve, wherein the first valve is used to open when the internal pressure of the oil tank is greater than P1 or less than 0, the third valve is used to open when the internal pressure of the liquid storage tank is greater than P2 or the internal pressure of the oil tank is less than 0, and the second valve is used to open when the internal pressure of the oil tank is greater than 0 and less than P1;

[0008] The P1 is the internal rated pressure of the oil tank, and the P2 is the internal rated pressure of the fluid storage tank.

[0009] In one of the embodiments, the liquid storage tank is supported in the middle of the condensation tank.

[0010] In one embodiment, the third valve is located on a portion of the second oil and gas pipe inside the condensate tank.

[0011] In one embodiment, the end of the second oil and gas pipe connected to the liquid storage tank is lower than the end of the second oil and gas pipe connected to the carbon canister.

[0012] In one embodiment, in the vertical direction, the first oil and gas pipe and the second oil and gas pipe are connected to the middle or above the liquid storage tank.

[0013] In one of the embodiments, in the horizontal direction, the first oil and gas pipe and the second oil and gas pipe are respectively connected to two ends of the liquid storage tank.

[0014] In one embodiment, the first valve, the second valve and the third valve are all electrically controlled valves.

[0015] In one embodiment, a pressure sensor is disposed in the oil tank, and a temperature sensor and a pressure sensor are disposed in the fluid storage tank.

[0016] In one embodiment, the refrigerator is an air conditioning refrigeration system.

[0017] On the other hand, the utility model further provides a vehicle, which includes the low-emission fuel system of any one of the above embodiments.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] This low-emission fuel system sets an oil-gas condensation system between the fuel tank and the carbon canister, so that the oil vapor discharged from the fuel tank to the carbon canister will pass through the oil-gas condensation system and be condensed and liquefied by the refrigerator, which not only realizes the pressure relief of the fuel tank, but also realizes the liquefaction recovery of the oil vapor, reduces the oil-gas emission of the fuel system, reduces the load of the carbon canister, reduces environmental pollution, increases the fuel utilization rate, and saves energy. Through the design of each valve, each pipe fitting can be conditionally connected or blocked to ensure timely exhaust, gas replenishment and oil recovery of the fuel tank, maintain the balance of the internal pressure of the fuel tank, make the operation stability of the fuel system better, and can also realize the retention of oil vapor in the liquid storage tank, ensure that the oil vapor is fully condensed and liquefied in the liquid storage tank, improve the recovery rate of oil vapor, and further reduce the external discharge of oil vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a low-emission fuel system in one embodiment;

[0021] Figure 2 Schematic diagram of the structure of an oil and gas condensation system in one embodiment.

[0022] The figure marks in the drawings of the specification include: oil tank 1, oil and gas condensation system 2, condensation box 201, liquid storage box 202, carbon canister 3, first oil and gas pipe 4, oil pipe 5, second oil and gas pipe 6, first valve 7, second valve 8, third valve 9, refrigerator 10. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0025] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0026] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] The fuel system of existing vehicles will discharge the fuel vapor directly through the carbon canister when a large amount of fuel vapor accumulates in the fuel tank. However, excessive fuel vapor can easily cause the carbon canister to become saturated, which is insufficient to completely absorb the evaporated oil and gas, thereby causing the oil and gas to be directly discharged into the atmosphere, leading to energy waste and environmental pollution.

[0028] The embodiment of the utility model provides a low-emission fuel system, which includes a fuel tank 1, an oil-gas condensation system 2 and a carbon canister 3;

[0029] The oil-gas condensation system 2 comprises a condensation tank 201 and a liquid storage tank 202. The condensation tank 201 is arranged above the oil tank 1. A refrigerator 10 is arranged on the condensation tank 201. The liquid storage tank 202 is arranged inside the condensation tank 201.

[0030] An oil pipe 5 and a first oil-gas pipe 4 are connected between the liquid storage box 202 and the oil tank 1, and the oil pipe 5 is located at the bottom of the liquid storage box 202, and a second oil-gas pipe 6 is connected between the liquid storage box 202 and the carbon canister 3;

[0031] The first oil and gas pipe 4, the oil pipe 5 and the second oil and gas pipe 6 are respectively provided with a first valve 7, a second valve 8 and a third valve 9, wherein the first valve 7 is used to open when the internal pressure of the oil tank 1 is greater than P1 or less than 0, the third valve 9 is used to open when the internal pressure of the liquid storage tank 202 is greater than P2 or the internal pressure of the oil tank 1 is less than 0, and the second valve 8 is used to open when the internal pressure of the oil tank 1 is greater than 0 and less than P1;

[0032] P1 is the internal rated pressure of the oil tank 1 , and P2 is the internal rated pressure of the fluid storage tank 202 .

[0033] The low emission fuel system provided by the embodiment of the utility model has the following operating principles:

[0034] When the internal pressure of the oil tank 1 is greater than P1, it indicates that there is a lot of oil vapor inside the oil tank 1. In order to avoid deformation of the oil tank 1, the oil vapor needs to be discharged. Specifically, when the internal pressure of the oil tank 1 is greater than P1, the first valve 7 is opened, and the oil vapor enters the liquid storage tank 202 along the first oil and gas pipe 4, and the refrigerator 10 is started at the same time. The refrigerator 10 cools the liquid storage tank 202. When the internal temperature of the liquid storage tank 202 drops to the condensation point of the oil vapor, the oil vapor will condense into oil liquid and be stored in the liquid storage tank 202.

[0035] In the process of continuously introducing oil vapor into the liquid storage tank 202, the internal air pressure of the liquid storage tank 202 will continue to increase. To ensure the stable operation of the liquid storage tank 202, when the internal pressure of the liquid storage tank 202 is greater than P2, the third valve 9 is opened to allow part of the unliquefied oil vapor and air to flow through the second oil and gas pipe 6 to the carbon canister 3, and the carbon canister 3 adsorbs the oil and gas and finally discharges the air to reduce the internal air pressure of the liquid storage tank 202.

[0036] As the oil vapor inside the fuel tank 1 is continuously discharged, the pressure inside the fuel tank 1 gradually decreases. When the internal pressure of the fuel tank 1 is less than P1, there is no need to continue to discharge the oil vapor. At this time, the first valve 7 is closed and the second valve 8 is opened to allow the oil inside the liquid storage tank 202 to be discharged back to the fuel tank 1 through the oil pipe 5, thereby realizing the recycling of oil vapor and achieving the purpose of saving energy, reducing the load of the carbon canister 3, reducing oil and gas emissions from the fuel system, and reducing environmental pollution.

[0037] When the internal pressure of the fuel tank 1 is less than 0, it indicates that the fuel tank 1 is under negative pressure. In order to avoid the adverse effects of deformation and oil leakage of the fuel tank 1, air needs to be added to the fuel tank 1. Specifically, the first valve 7 and the third valve 9 are opened, and the air enters the liquid storage tank 202 through the carbon canister 3 and the second oil and gas pipe 6, and then enters the fuel tank 1 through the first oil and gas pipe 4 to replenish the fuel tank 1 until the internal pressure of the fuel tank 1 is maintained at a normal state.

[0038] The low emission fuel system provided by the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0039] according to Figure 1 A low-emission fuel system according to at least one embodiment of the present utility model is exemplarily shown, and the low-emission fuel system includes: a fuel tank 1 , an oil-gas condensation system 2 and a carbon canister 3 .

[0040] In this embodiment, the oil vapor condensation system 2 is connected between the fuel tank 1 and the carbon canister 3, and is used to receive the oil vapor discharged from the fuel tank 1 and condense it into oil liquid and discharge it back into the fuel tank 1, so as to reduce the oil vapor discharge amount of the carbon canister 3 and achieve low emission of the fuel system. Figure 1 The oil-gas condensation system 2 is arranged above the oil tank 1 and connected to the oil tank 1 through at least two pipes, one of which is used to introduce the oil vapor inside the oil tank 1 into the oil-gas condensation system 2, and the oil vapor is condensed and liquefied by the oil-gas condensation system 2. The liquefied oil flows back to the oil tank 1 from another pipe under the action of gravity, so as to realize the recycling of the oil vapor. The other end of the oil-gas condensation system 2 is connected to the carbon canister 3 through a pipe, so that the oil gas or air that has not been liquefied in the oil-gas condensation system 2 can be discharged into the carbon canister 3 through the pipe, and the carbon canister 3 adsorbs the gas and then discharges it.

[0041] For details, see Figure 2 The oil vapor condensation system 2 includes a condensation tank 201 and a liquid storage tank 202, wherein the liquid storage tank 202 is arranged inside the condensation tank 201, and the condensation tank 201 is used to cool the liquid storage tank 202 to provide conditions for the condensation and liquefaction of the oil vapor. Specifically, a refrigerator 10 is arranged on the condensation tank 201, and the refrigerator 10 is used to control the temperature of the chamber inside the condensation tank 201, so as to realize the cooling of the liquid storage tank 202 inside the condensation tank 201. For example, see Figure 2 In this embodiment, the refrigerator 10 can be an air-conditioning refrigeration system, which includes components such as a compressor, a condenser, a dryer, an expansion valve, and an evaporator. The evaporator is arranged inside the condensation box 201 and can provide cold air for the inside of the condensation box 201.

[0042] For further information, see Figure 2The liquid storage tank 202 is supported in the middle of the condensing tank 201. For example, the liquid storage tank 202 is supported in the middle of the condensing tank 201 by a support frame (not shown), so that in the vertical direction and the horizontal direction, there is a gap between each side of the liquid storage tank 202 and each side of the condensing tank 201, so that the cold air can evenly contact the liquid storage tank 202 from each side of the liquid storage tank 202, so that the cooling of the liquid storage tank 202 is more uniform, the condensation effect of the oil vapor is better, and the discharge of the oil vapor can be further reduced.

[0043] In this embodiment, the liquid storage tank 202 is used to collect the oil vapor discharged from the oil tank 1, so that the oil vapor can be cooled and condensed by the refrigerator 10. The liquid storage tank 202 is also used to store the oil liquid formed by the condensation and liquefaction of the oil vapor, and to reintroduce the oil liquid into the oil tank 1 when necessary to achieve the recovery and utilization of the oil vapor. The liquid storage tank 202 is also used to collect the air discharged from the oil tank 1, and to introduce the air and part of the oil vapor into the carbon canister 3 when necessary to achieve the external discharge of the air and part of the oil vapor.

[0044] For details, see Figure 1 and Figure 2 An oil pipe 5 and a first oil-gas pipe 4 are connected between the liquid storage tank 202 and the oil tank 1, and a second oil-gas pipe 6 is connected between the liquid storage tank 202 and the carbon canister 3, wherein the first oil-gas pipe 4 is used to introduce the oil vapor and air and other gases in the oil tank 1 into the liquid storage tank 202, the oil pipe 5 is used to re-introduce the oil formed by the condensation and liquefaction of the oil vapor in the liquid storage tank 202 into the oil tank 1, and the second oil-gas pipe 6 is used to introduce the unliquefied oil and gas or air in the liquid storage tank 202 into the carbon canister 3.

[0045] Further, in this embodiment, in the vertical direction, the first oil and gas pipe 4 and the second oil and gas pipe 6 are connected to the middle or above of the liquid storage tank 202, for example, Figure 2 The embodiment in which the first oil and gas pipe 4 and the second oil and gas pipe 6 are connected to the middle part of the liquid storage tank 202 is exemplarily shown. With such a configuration, the connection position of the first oil and gas pipe 4 and the second oil and gas pipe 6 can be higher than the oil inside the liquid storage tank 202, thereby preventing the oil from flowing back into the first oil and gas pipe 4 and the second oil and gas pipe 6.

[0046] For further information, see Figure 2 In the horizontal direction, the first oil and gas pipe 4 and the second oil and gas pipe 6 are respectively connected to the two ends of the liquid storage tank 202, so that the oil vapor introduced into the liquid storage tank 202 by the first oil and gas pipe 4 needs to pass through the entire liquid storage tank 202 at least before it can be discharged from the second oil and gas pipe 6, ensuring the condensation of the oil vapor introduced into the liquid storage tank 202. The condensation is sufficient, further reducing the external discharge of oil vapor and reducing emissions from the fuel system.

[0047] See also Figure 1 and Figure 2The first oil and gas pipe 4, the oil pipe 5 and the second oil and gas pipe 6 are respectively provided with a first valve 7, a second valve 8 and a third valve 9. The three valves respectively control the on-off of the three pipes to achieve the conditional discharge of the oil vapor inside the oil tank 1 and the conditional introduction of external air, thereby maintaining the constant internal pressure of the oil tank 1 and avoiding the oil tank 1 from being deformed by pressure.

[0048] Specifically, in this embodiment, the first valve 7 is used to open when the internal pressure of the oil tank 1 is greater than P1 or less than 0, wherein P1 is the rated pressure inside the oil tank 1. When the internal pressure of the oil tank 1 is greater than P1, it can be understood that the pressure inside the oil tank 1 is greater than the rated pressure inside the oil tank 1. For example, if the pressure resistance of the oil tank 1 is 35kpa, then the rated pressure P1 inside the oil tank 1 can be 30kpa. When the oil vapor inside the oil tank 1 generates a pressure greater than 30kpa, it indicates that the internal air pressure of the oil tank 1 is too high and needs to be exhausted. At this time, the oil vapor inside the oil tank 1 can be discharged into the liquid storage tank 202 through the first oil and gas pipe 4 by opening the first valve 7, so as to reduce the oil vapor inside the oil tank 1, thereby reducing the internal pressure of the oil tank 1. When the internal pressure of the oil tank 1 is less than 0, it can be understood that the internal pressure of the oil tank 1 is negative pressure. At this time, the first valve 7 can be opened to replenish air into the oil tank 1 through the first oil and gas pipe 4 to maintain the balance of the internal pressure of the oil tank 1.

[0049] The second valve 8 is used to open when the internal pressure of the oil tank 1 is greater than 0 and less than P1. That is to say, when the oil vapor in the oil tank 1 is gradually discharged into the liquid storage tank 202, the internal pressure of the oil tank 1 gradually tends to a balanced state. At this time, the second valve 8 is opened, so that the oil in the liquid storage tank 202 can be reintroduced into the oil tank 1 through the oil pipe 5, so that the oil vapor is recovered. Under this pressure state, opening the second valve 8 to recover the oil will not cause a large change in the internal pressure of the oil tank 1, and the internal pressure balance of the oil tank 1 can be maintained.

[0050] The third valve 9 is used to open when the pressure inside the liquid storage tank 202 is greater than P2 or the pressure inside the oil tank 1 is less than 0, wherein P2 is the rated pressure inside the liquid storage tank 202, and P2 is less than P1. If the pressure inside the liquid storage tank 202 is greater than P2, it can be understood that the pressure inside the liquid storage tank 202 is greater than the rated pressure inside the liquid storage tank 202. For example, if P2 is 25kpa, when the oil vapor inside the liquid storage tank 202 generates a pressure greater than 25kpa, it indicates that the gas pressure inside the liquid storage tank 202 is too high and needs to be exhausted. At this time, the third valve 9 is opened, and the air and part of the oil vapor inside the liquid storage tank 202 can be guided to the carbon canister 3 through the second oil and gas pipe 6 to reduce the pressure inside the liquid storage tank 202. The third valve 9 is opened when the pressure inside the oil tank 1 is less than 0 in order to cooperate with the opening of the first valve 7. After the external air is introduced into the liquid storage tank 202 through the carbon canister 3 and the second oil and gas pipe 6, the part of the air is introduced into the oil tank 1 from the first oil and gas pipe 4 to maintain the balance of the pressure inside the oil tank 1.

[0051] Based on the above structural design, the first valve 7 and the second valve 8 can control the connection or blockage between the fuel tank 1 and the liquid storage tank 202, so as to realize timely exhaust, air replenishment and oil recovery of the fuel tank 1, maintain the balance of the internal pressure of the fuel tank 1, and ensure the stable operation of the fuel system. The third valve 9 can control the connection or blockage between the carbon canister 3 and the liquid storage tank 202, so as to realize the retention of oil vapor in the liquid storage tank 202, ensure that the oil vapor is fully condensed and liquefied in the liquid storage tank 202, improve the recovery rate, and further reduce the discharge of oil vapor.

[0052] For further information, see Figure 2 In this embodiment, the third valve 9 is located on the portion of the second oil and gas pipe 6 placed inside the condensate box 201, and the first valve 7 and the second valve 8 are both located outside the condensate box 201. With this arrangement, when the third valve 9 is not opened, the third valve 9 can block all the oil vapor inside the condensate box 201, preventing part of the oil vapor from directly flowing from the second oil and gas pipe 6 to the outside of the condensate box 201, so that the oil vapor inside the second oil and gas pipe 6 can also be fully liquefied, so that the recovery rate of the oil vapor is higher, and the oil and gas emissions of the fuel system are further reduced.

[0053] Furthermore, in this embodiment, the end of the second oil and gas pipe 6 connected to the liquid storage tank 202 is lower than the end of the second oil and gas pipe 6 connected to the carbon canister 3. For example, see Figure 2 The second oil and gas pipe 6 is a "Z"-shaped structure, and its end connected to the liquid storage tank 202 is lower than its end connected to the carbon canister 3. Correspondingly, the third valve 9 is arranged in the middle of the vertical pipe section of the second oil and gas pipe 6. Such an arrangement allows the second oil and gas pipe 6 to discharge the liquefied oil therein into the liquid storage tank 202, thereby preventing the oil from flowing out of the second oil and gas pipe 6 and ensuring the safety of the fuel system.

[0054] Furthermore, in this embodiment, the first valve 7, the second valve 8 and the third valve 9 are all electrically controlled valves, making their control simpler and more convenient. For example, the first valve 7, the second valve 8 and the third valve 9 can all be connected to the control unit of the vehicle to achieve automatic control of each valve.

[0055] In this embodiment, a pressure sensor is provided in the fuel tank 1. The pressure sensor can detect the pressure inside the fuel tank 1 in real time and feed it back to the vehicle control unit, so that the control unit can open various valves and the refrigerator 10 according to the feedback pressure signal, so that the exhaust and condensation responses are more timely and their safety is ensured.

[0056] In this embodiment, a temperature sensor and a pressure sensor are provided in the liquid storage tank 202, and the temperature sensor and the pressure sensor are used to monitor the temperature and pressure of the liquid storage tank 202 and feed back to the vehicle control unit, so that the control unit can open each valve and control the cooling temperature of the refrigerator 10 according to the feedback pressure signal, so as to ensure the sufficient condensation and liquefaction of the oil vapor in the liquid storage tank 202 and reduce the discharge of oil vapor.

[0057] On the other hand, an embodiment of the present invention further provides a vehicle, which includes the low-emission fuel system of any of the above embodiments.

[0058] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A low emission fuel system, characterized in that: It comprises an oil tank (1), an oil and gas condensation system (2) and a carbon canister (3); The oil-gas condensation system (2) comprises a condensation tank (201) and a liquid storage tank (202); the condensation tank (201) is arranged above the oil tank (1); a refrigerator (10) is arranged on the condensation tank (201); and the liquid storage tank (202) is arranged inside the condensation tank (201); An oil pipe (5) and a first oil and gas pipe (4) are connected between the liquid storage box (202) and the oil tank (1), and the oil pipe (5) is located at the bottom of the liquid storage box (202), and a second oil and gas pipe (6) is connected between the liquid storage box (202) and the carbon canister (3); The first oil and gas pipe (4), the oil pipe (5) and the second oil and gas pipe (6) are respectively provided with a first valve (7), a second valve (8) and a third valve (9), wherein the first valve (7) is used to open when the internal pressure of the oil tank (1) is greater than P1 or less than 0, the third valve (9) is used to open when the internal pressure of the liquid storage tank (202) is greater than P2 or the internal pressure of the oil tank (1) is less than 0, and the second valve (8) is used to open when the internal pressure of the oil tank (1) is greater than 0 and less than P1; The P1 is the internal rated pressure of the oil tank (1), and the P2 is the internal rated pressure of the liquid storage tank (202).

2. The low emission fuel system according to claim 1, characterized in that: The liquid storage tank (202) is supported at the middle of the condensation tank (201).

3. The low emission fuel system according to claim 1, characterized in that: The third valve (9) is located on the portion of the second oil and gas pipe (6) inside the condensate box (201).

4. The low emission fuel system according to claim 3, characterized in that: The end of the second oil and gas pipe (6) connected to the liquid storage tank (202) is lower than the end of the second oil and gas pipe (6) connected to the carbon canister (3).

5. The low emission fuel system according to claim 1, characterized in that: In the vertical direction, the first oil and gas pipe (4) and the second oil and gas pipe (6) are both connected to the middle or above the liquid storage tank (202).

6. The low emission fuel system according to claim 1, characterized in that: In the horizontal direction, the first oil and gas pipe (4) and the second oil and gas pipe (6) are respectively connected to two ends of the liquid storage box (202).

7. The low emission fuel system according to claim 1, characterized in that: The first valve (7), the second valve (8) and the third valve (9) are all electrically controlled valves.

8. The low emission fuel system according to claim 7, characterized in that: A pressure sensor is arranged in the oil tank (1), and a temperature sensor and a pressure sensor are arranged in the liquid storage tank (202).

9. The low emission fuel system according to claim 1, characterized in that: The refrigerator (10) is an air-conditioning refrigeration system.

10. A vehicle, characterized in that: A low emission fuel system comprising any one of claims 1-9.

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