Fuel supply system and vehicle

Abstract

The present invention belongs to the technical field of automobiles, and discloses a fuel supply system and a vehicle. The fuel supply system includes a main fuel supply mechanism, a secondary fuel supply mechanism, a diesel filter, and a degassing switching mechanism. The main fuel supply mechanism includes a large fuel tank and a small fuel tank that are interconnected. The small fuel tank is provided with a fuel supply port and a fuel return port, and the fuel return port and the fuel supply port are respectively connected to the engine. A heating component is provided in the small fuel tank; the secondary fuel supply mechanism includes a secondary fuel tank, and a fuel pipeline is connected to the secondary fuel tank; the diesel filter is arranged in the fuel supply pipeline, the inlet of the diesel filter is connected to the small fuel tank, and the outlet of the diesel filter is connected to the engine; the degassing switching mechanism is connected between the large fuel tank, the diesel filter, the small fuel tank, and the fuel pipeline. The degassing switching mechanism has: a first state in which the large fuel tank is connected to the diesel filter; a second state in which the diesel filter is connected to the fuel pipeline; a third state in which the fuel pipeline is connected to the small fuel tank, and the diesel filter is connected to the degassing switching mechanism. This fuel supply system meets the long-distance operation requirements of the vehicle and at the same time avoids the problem that the vehicle is difficult to start in a low-temperature environment.

Description

Technical Field

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

[0002] Diesel commercial vehicles, characterized by long mileage and high efficiency, are generally equipped with larger fuel tanks. However, due to the constraints of the vehicle's overall layout, the fuel tank capacity cannot be increased indefinitely.

[0003] To address the above-mentioned issues, the prior art discloses a dual-tank fuel supply device, which includes a main fuel tank, a secondary fuel tank, and a diesel filter. The main fuel tank is connected to the engine via an oil return channel and an oil supply channel, while the secondary fuel tank's oil outlet pipe is connected to the oil return channel to supply fuel to the main fuel tank.

[0004] The main fuel tank of the above-mentioned dual-tank fuel supply device is a separate large fuel tank. When the engine is in a low temperature environment, the fuel in the large fuel tank is very likely to crystallize, making it difficult to start the vehicle.

[0005] Therefore, there is an urgent need for a fuel supply system and a vehicle to solve the above problems. Summary of the Invention

[0006] According to one aspect of the present invention, an object is to provide a fuel supply system that meets the long-mileage running requirements of a vehicle while avoiding the problem of difficulty in starting the vehicle in a low-temperature environment.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Fuel supply system, including:

[0009] A main oil supply mechanism, comprising a large oil tank and a small oil tank connected to each other, the small oil tank being provided with an oil supply port and an oil return port, the oil return port being connected to the engine via an oil return line, the oil supply port being connected to the engine via an oil supply line, and a heating assembly being provided in the small oil tank;

[0010] Auxiliary oil supply mechanism, the auxiliary oil supply mechanism includes an auxiliary oil tank, and the auxiliary oil tank is provided with an oil delivery pipe connected to the inner cavity thereof;

[0011] a diesel filter, the diesel filter being arranged in the oil supply pipeline, the inlet of the diesel filter being connected to the small fuel tank, and the outlet of the diesel filter being connected to the engine;

[0012] The degassing switching mechanism is connected between the large fuel tank, the diesel filter, the small fuel tank and the oil pipeline. The degassing switching mechanism has three states:

[0013] In the first state, the large fuel tank is connected to the diesel filter;

[0014] In the second state, the diesel filter is connected to the fuel delivery pipe.

[0015] In the third state, the fuel delivery pipe is connected to the small fuel tank, and the diesel filter is connected to the degassing switching mechanism.

[0016] As a preferred solution of the fuel supply system provided by the present invention, the diesel filter is provided with an oil inlet, a first oil outlet, a second oil outlet and a degassing port; the oil inlet is connected to the oil supply port, and the first oil outlet is connected to the engine.

[0017] When the degassing switching mechanism is in the first state, the large fuel tank is connected to the degassing port.

[0018] When the degassing switching mechanism is in the second state, the second oil outlet is connected to the fuel delivery pipe.

[0019] When the degassing switching mechanism is in the third state, the fuel delivery pipe is connected to the small fuel tank, and the degassing port is connected to the degassing switching mechanism.

[0020] As a preferred solution of the fuel supply system provided by the present invention, the degassing switching mechanism includes a base and a rotary valve. The rotary valve is rotatably arranged in the base. By rotating the rotary valve, the switching among the three states of the degassing switching mechanism can be realized.

[0021] As a preferred solution of the fuel supply system provided by the present invention, the heating component is a heating pipe. The heating pipe is arranged in the inner cavity of the small fuel tank and is used to heat the fuel in the small fuel tank.

[0022] As a preferred solution of the fuel supply system provided by the present invention, the main fuel supply mechanism further includes a check valve. The large fuel tank and the small fuel tank are connected through a connecting pipe. The check valve is arranged in the connecting pipe and is used to control the one-way fuel supply from the large fuel tank to the small fuel tank.

[0023] As a preferred solution of the fuel supply system provided by the present invention, the main fuel supply mechanism further includes a first liquid level sensor integrated in the small fuel tank for detecting the liquid level in the small fuel tank; and / or, the auxiliary fuel supply mechanism further includes a second liquid level sensor integrated in the auxiliary fuel tank for detecting the liquid level in the auxiliary fuel tank.

[0024] As a preferred solution of the fuel supply system provided by the present invention, the small fuel tank is provided with a first fuel filling port. A first fuel tank cover is movably arranged at the first fuel filling port, and the first fuel tank cover can open or seal the first fuel filling port.

[0025] As a preferred solution of the fuel supply system provided by the present invention, the large fuel tank is provided with a second fuel filling port, and a second fuel tank cover is movably arranged at the second fuel filling port, and the second fuel tank cover can open or seal the second fuel filling port.

[0026] As a preferred solution of the fuel supply system provided by the present invention, the large fuel tank is provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively communicated with the engine.

[0027] According to another aspect of the present invention, an object is to provide a vehicle, and the vehicle includes the fuel supply system according to any one of the above solutions.

[0028] Advantages of the present invention:

[0029] The fuel supply system provided by the present invention includes a main fuel supply mechanism, a secondary fuel supply mechanism, a diesel filter, and a degassing switching mechanism. The main fuel supply mechanism includes a large fuel tank and a small fuel tank that are communicated with each other. The small fuel tank is provided with a fuel supply port and a fuel return port. The fuel return port is communicated with the engine through a fuel return pipeline, and the fuel supply port is communicated with the engine through a fuel supply pipeline. The small fuel tank can heat the fuel therein. That is to say, the size of the small fuel tank is small, so that the heating temperature of the fuel rises sharply in a short time, and the heating efficiency is high. When the vehicle is running in a cold area, before the engine starts, the fuel in the small fuel tank is quickly heated, and the heated diesel flows to the engine through the fuel supply port to provide working fuel for the engine. And after the vehicle leaves the factory, only a small amount of fuel needs to be injected into the small fuel tank with a small volume to achieve a certain mileage of endurance, saving economic costs. The secondary fuel supply mechanism includes a secondary fuel tank, and the secondary fuel tank is provided with an oil pipeline communicating with its inner cavity. The diesel filter is arranged in the fuel supply pipeline. The inlet of the diesel filter is communicated with the small fuel tank, and the outlet of the diesel filter is communicated with the engine. The diesel filter can filter the fuel. The degassing switching mechanism is connected between the large fuel tank, the diesel filter, the small fuel tank and the oil pipeline. The degassing switching mechanism realizes the switching among the states of degassing the diesel filter, the state of the fuel in the small fuel tank opening the oil pipeline, and the state of supplying fuel from the secondary fuel tank to the large fuel tank through the oil pipeline by using the switching of three states. Description of the drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0031] Figure 1 It is a schematic diagram of the fuel supply system provided by the embodiment of the present invention;

[0032] Figure 2It is a partial structural schematic diagram of the main fuel supply mechanism provided by an embodiment of the present invention;

[0033] Figure 3 is Figure 2 a partially enlarged view of the structure marked A in

[0034] Figure 4 It is a structural schematic diagram of the degassing switching mechanism provided by an embodiment of the present invention;

[0035] Figure 5 It is a structural decomposition schematic diagram of the degassing switching mechanism provided by an embodiment of the present invention.

[0036] In the figure:

[0037] 1. Engine;

[0038] 100. Large fuel tank; 110. Second fuel tank cover; 120. Water inlet; 130. Water outlet;

[0039] 200. Small fuel tank; 210. Fuel supply port; 220. Oil return port; 230. Oil return pipeline; 240. Fuel supply pipeline; 250. Heating pipe; 260. First liquid level sensor; 270. First fuel tank cover;

[0040] 300. Auxiliary fuel tank; 310. Oil delivery pipe; 320. Second liquid level sensor;

[0041] 400. Diesel filter; 410. Oil inlet; 420. First oil outlet; 430. Second oil outlet; 440. Degassing port;

[0042] 500. Degassing switching mechanism; 510. Base; 511. Inner core; 512. Outer shell; 520. Rotary valve; 530. Air pump;

[0043] 600. Connecting pipe. Detailed implementation manners

[0044] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0045] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", and "left" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0049] Referring to Figure 1 , this embodiment provides a fuel supply system. The fuel supply system includes a main fuel supply mechanism, a secondary fuel supply mechanism, a fuel filter 400, and a degassing switching mechanism 500. The secondary fuel supply mechanism is connected to the main fuel supply mechanism and can supply fuel to the main fuel supply mechanism. The fuel filter 400 is arranged between the main fuel supply mechanism and the engine 1 and can purify the fuel supplied by the main fuel supply mechanism to the engine 1. The degassing switching mechanism 500 is arranged between the main fuel supply mechanism, the secondary fuel supply mechanism, and the fuel filter 400 and can control the connection mode among the three.

[0050] Specifically, referring to Figures 1 - 3, the main fuel supply mechanism includes a large fuel tank 100 and a small fuel tank 200 that are interconnected. Among them, the volume of the small fuel tank 200 is smaller than that of the large fuel tank 100. The small fuel tank 200 is provided with a fuel supply port 210 and a fuel return port 220. The fuel return port 220 is connected to the engine 1 through a fuel return pipeline 230, and the fuel supply port 210 is connected to the engine 1 through a fuel supply pipeline 240. A heating component is arranged in the small fuel tank 200, and the heating component can heat the fuel to melt it as soon as possible.

[0051] More specifically, the above-mentioned heating component is a heating pipe 250. The heating pipe 250 is arranged in the inner cavity of the small fuel tank 200, and the heating pipe 250 is used to heat the fuel in the small fuel tank 200. The heating pipe 250 in the inner cavity of the small fuel tank 200 realizes electric heating of the fuel by converting electrical energy into heat energy. Since the size of the small fuel tank 200 is very small, the heating temperature of the fuel rises rapidly in a short time, and the heating efficiency is high.

[0052] More specifically, the top of the large fuel tank 100 is provided with a water inlet 120 and a water outlet 130. The water inlet 120 is connected to the water tank of the engine 1 through a water inlet pipe, and the water outlet 130 is connected to the water tank of the engine 1 through a water return pipe. Refer to Figure 1 and Figure 2 , the large fuel tank 100 and the small fuel tank 200 are interconnected through a connecting pipe 600. The connecting pipe 600 is specifically connected to the oil delivery port at the bottom of the large fuel tank 100 and the oil receiving port at the bottom of the small fuel tank 200.

[0053] Preferably, the main fuel supply mechanism further includes a one-way valve. The one-way valve is placed in the connecting pipe 600 and is used to control the one-way fuel supply from the large fuel tank 100 to the small fuel tank 200. The one-way valve can be a one-way ball valve, which adopts an aluminum alloy single flange structure and is arranged at one end of the connecting pipe 600 close to the oil receiving port to ensure that the fuel can only flow from the large fuel tank 100 to the small fuel tank 200 unidirectionally and prevent the fuel from flowing back.

[0054] When the fuel supply system operates, No. 0 diesel is added to both the large fuel tank 100 and the small fuel tank 200. When the vehicle needs to run in cold regions, before the engine 1 starts, the heating pipe 250 is used to quickly heat the fuel in the small fuel tank 200. The heated No. 0 diesel flows to the engine 1 through the fuel supply pipeline 240 to provide working fuel for the engine 1. After the engine 1 works for a certain period of time, the waste heat generated by the operation of the engine 1 raises the temperature of the cooling water in the water tank. Then the cooling water in the water tank flows to the large fuel tank 100 through the water inlet pipe to heat and thaw the No. 0 diesel in the large fuel tank 100 until the fuel is completely melted. The melted No. 0 diesel enters the small fuel tank through the oil outlet, the connecting pipe 600 and the oil receiving port in sequence, and finally continuously supplies oil to the engine 1 through the fuel supply pipeline 240, providing power for the normal operation of the vehicle using only low-cost No. 0 diesel in cold regions, without the need to use high-cost -35 diesel, reducing the comprehensive use cost.

[0055] Preferably, the number of the heating pipes 250 is multiple. The multiple heating pipes 250 are arranged at intervals and are all immersed in the fuel in the small fuel tank 200. Specifically, one end of the heating pipe 250 is arranged on the outer shell 512 of the small fuel tank 200, and the other end of the heating pipe 250 is completely immersed in the fuel. When the power supply voltage is directly applied to the heating pipe 250, the heating pipe 250 generates heat when an electric current flows through it. By increasing the number of the heating pipes 250, the time for the fuel to rise in temperature can be shortened, and the heating efficiency is higher. Before the engine 1 starts, the multiple heating pipes 250 electrically heat the fuel in the way of converting electrical energy into heat energy, so that the fuel in the small fuel tank 200 and the fuel in the low-pressure pipeline are melted. Preferably, the multiple heating pipes 250 are all integrated into the small fuel tank 200, which is beneficial to improving the structural compactness of the main fuel supply mechanism.

[0056] Preferably, the main fuel supply mechanism further includes a filter. The filter is arranged in the inner cavity of the small fuel tank 200 and is used to filter impurities and gases in the fuel in the small fuel tank 200. The filter is integrally arranged with the small fuel tank 200, does not occupy the space outside the small fuel tank 200, has a compact structure, and makes reasonable use of the installation space. After the electrically heated fuel is completely melted, impurities and gases are filtered under the action of the filter, and clean fuel is supplied for the engine 1 to operate. During the preheating stage of the engine 1, the melted fuel circulates in the cavity of the integrated filter to ensure sufficient fuel supply during the preheating stage. After the engine 1 completes preheating, the electric heating is turned off.

[0057] Specifically, the main fuel supply mechanism further includes a first liquid level sensor 260. The first liquid level sensor 260 is integrated into the small fuel tank 200 and is used to sense the liquid level signal in the small fuel tank 200.

[0058] More specifically, continue to refer to Figure 2, the small fuel tank 200 is provided with a first fuel filling port, and a first fuel tank cap 270 is movably arranged at the first fuel filling port. The first fuel tank cap 270 can open or seal the first fuel filling port. Specifically, during the adjustment and transportation of the whole vehicle after assembly, the first fuel tank cap 270 is opened, and only a small amount of fuel is added to the small fuel tank 200, while no fuel is added to the large fuel tank 100. The whole vehicle can travel short distances to a gas station or a destination under the condition of supplying fuel from the small amount of fuel in the small fuel tank 200, reducing the fuel filling amount of the whole vehicle after assembly. There is no need to add fuel to the large fuel tank 100, thus reducing the fuel filling cost of the vehicle factory. It can be understood that the large fuel tank 100 has a large size and volume. If the whole vehicle travels only relying on the large fuel tank 100 after assembly, a large amount of fuel needs to be added to meet the operation of the engine 1. While the small fuel tank 200 has a small size and volume, and only a small amount of fuel can fill it or meet the operation conditions of the engine 1.

[0059] More specifically, the large fuel tank 100 is provided with a second fuel filling port, and a second fuel tank cap 110 is movably arranged at the second fuel filling port. The second fuel tank cap 110 can open or seal the second fuel filling port. The small fuel tank 200 and the large fuel tank 100 are respectively provided with a first fuel tank cap 270 and a second fuel tank cap 110, which can realize separate refueling of the small fuel tank 200 and the large fuel tank 100 without mutual influence, so that different grades of fuel can be filled to adapt to the operation of the whole vehicle under different environmental conditions.

[0060] Continue to refer to Figure 1 , the auxiliary fuel supply mechanism includes an auxiliary fuel tank 300, and a fuel delivery pipe 310 communicating with its inner cavity is arranged on the auxiliary fuel tank 300. The degassing and switching mechanism 500 is connected among the large fuel tank 100, the small fuel tank 200 and the auxiliary fuel tank 300. The degassing and switching mechanism 500 can connect the large fuel tank 100 and the fuel delivery pipe 310; or connect the small fuel tank 200 and the fuel delivery pipe 310. The degassing and switching mechanism 500 can control the fuel delivery pipe 310 to connect to the large fuel tank 100 to supplement the fuel in the auxiliary fuel tank 300 to the large fuel tank 100; the degassing and switching mechanism 500 can also control the small fuel tank 200 to connect to the fuel delivery pipe 310, so that the fuel in the small fuel tank 200 can be guided into the fuel delivery pipe 310 to open the fuel delivery pipe 310 and prepare for guiding the fuel from the auxiliary fuel tank 300 to the large fuel tank 100.

[0061] Specifically, the auxiliary fuel supply mechanism further includes a second liquid level sensor 320, which is integrated on the auxiliary fuel tank 300 and is used to sense the liquid level signal in the auxiliary fuel tank 300.

[0062] More specifically, refer to Figure 1, the fuel supply system further includes a diesel filter 400. The diesel filter 400 is arranged in the fuel supply pipeline 240, and is provided with an inlet 410, a first outlet 420, a second outlet 430 and a degassing port 440. The inlet 410 is communicated with the fuel supply port 210, and the first outlet 420 is communicated with the engine 1. The fuel in the small fuel tank 200 can enter the inlet 410 from the fuel supply port 210 and be purified by the diesel filter 400 to remove impurities and gas in the fuel, and then be supplied to the engine 1 from the first outlet 420.

[0063] More specifically, when the diesel filter 400 is arranged in the fuel supply pipeline 240, the degassing switching mechanism 500 is connected between the large fuel tank 100, the fuel delivery pipe 310 and the diesel filter 400.

[0064] Referring to Figure 4 and Figure 5 , the degassing switching mechanism 500 includes a base 510 and a rotary valve 520. The rotary valve 520 is arranged in the base 510. The base 510 includes an inner core 511 and an outer shell 512. The inner core 511 is inserted and fixed in the outer shell 512. The outer wall of the inner core 511 is spaced from the inner wall of the outer shell 512, and an annular accommodation space is formed therebetween. A plurality of first through holes are formed in the circumferential part and the bottom of the inner core 511, and a plurality of second through holes are formed in the circumferential part of the outer shell 512. And the opening positions of the plurality of second through holes are directly opposite to the opening positions of the plurality of first through holes one by one.

[0065] Specifically, the degassing switching mechanism 500 further includes an air pump 530. The air pump 530 is integrated in the base 510. The air pump 530 can be a degassing electric pump, which can extract the gas in the inner core 511 and the gas in other cavities communicated with the inner core 511.

[0066] Even more specifically, the rotary valve 520 is rotatably arranged in the base 510, and a plurality of third through holes are formed in the rotary valve 520. One or more of the plurality of third through holes can be communicated with one or more of the first through holes and one or more of the second through holes by the rotation of the rotary valve 520. That is, when the rotary valve 520 rotates, it can control the on-off between the oil return port 220, the degassing port 440, the fuel delivery pipe 310 and the second outlet 430.

[0067] The working principle of the degassing switching mechanism 500 is as follows: the degassing switching mechanism 500 communicates the large fuel tank 100 and the degassing port 440, and this is the first state; or, the degassing switching mechanism 500 communicates the second outlet 430 and the fuel delivery pipe 310, and this is the second state; or, the degassing switching mechanism 500 communicates the fuel delivery pipe 310 and the large fuel tank 100, and this is the third state.

[0068] In the first state, the large fuel tank 100 and the fuel pipe 310 are disconnected. Similarly, the small fuel tank 200 and the fuel pipe 310 are also disconnected. At this time, only the degassing port 440 is connected to the large fuel tank 100. The gas inside the fuel filter 400 is introduced into the large fuel tank 100 successively through the degassing port 440 and the degassing switching mechanism 500, realizing the degassing process of the internal space of the fuel filter 400. At this time, the degassing port 440 is connected to the degassing switching mechanism 500 in a fully open state.

[0069] In the second state, the small fuel tank 200, the fuel filter 400 and the fuel pipe 310 are connected. At this time, the fuel in the small fuel tank 200 can enter the inner core 511 successively through the fuel supply port 210, the fuel inlet 410, the filtering structure inside the fuel filter 400 and the second fuel outlet 430, and finally be guided into the fuel pipe 310, thus opening up the fuel pipe 310 and preparing for the fuel transfer from the auxiliary fuel tank 300 to the large fuel tank 100.

[0070] In the third state, the large fuel tank 100 and the fuel pipe 310 are connected through the degassing switching mechanism 500. At this time, the auxiliary fuel tank 300 can pump fuel into the large fuel tank 100, and at the same time, the air pump 530 degasses the fuel flowing from the auxiliary fuel tank 300 to the large fuel tank 100. At this time, the degassing port 440 is connected to the degassing switching mechanism 500 in a slightly open state.

[0071] This embodiment also provides a vehicle, which includes the fuel supply system provided in this embodiment. This fuel supply system can meet the long-distance operation requirements of the vehicle and avoid the problem that the vehicle is difficult to start in a low-temperature environment.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fuel supply system, characterized in that, Comprising: A main fuel supply mechanism, the main fuel supply mechanism includes a large fuel tank (100) and a small fuel tank (200) that are interconnected. The small fuel tank (200) is provided with a fuel supply port (210) and a fuel return port (220). The fuel return port (220) is connected to the engine (1) through a fuel return pipeline (230). The fuel supply port (210) is connected to the engine (1) through a fuel supply pipeline (240). A heating component is provided in the small fuel tank (200); A secondary fuel supply mechanism, the secondary fuel supply mechanism includes a secondary fuel tank (300), and the secondary fuel tank (300) is provided with an oil delivery pipe (310) communicating with its inner cavity; A diesel filter (400), the diesel filter (400) is arranged in the fuel supply pipeline (240). The inlet of the diesel filter (400) is connected to the small fuel tank (200), and the outlet of the diesel filter (400) is connected to the engine (1); An air removal switching mechanism (500), the air removal switching mechanism (500) is connected between the large fuel tank (100), the diesel filter (400), the small fuel tank (200) and the oil delivery pipe (310). The air removal switching mechanism (500) has three states: In the first state, the large fuel tank (100) is connected to the diesel filter (400); In the second state, the diesel filter (400) is connected to the oil delivery pipe (in0); In the third state, the oil delivery pipe (310) is connected to the small fuel tank (200), and the diesel filter (400) is connected to the air removal switching mechanism (500); The diesel filter (400) is provided with an oil inlet (410), a first oil outlet (420), a second oil outlet (430) and an air removal port (440); the oil inlet (410) is connected to the fuel supply port (210), and the first oil outlet (420) is connected to the engine (1); When the air removal switching mechanism (500) is in the first state, the large fuel tank (100) is connected to the air removal port (440); When the air removal switching mechanism (500) is in the second state, the second oil outlet (430) is connected to the oil delivery pipe (310); When the air removal switching mechanism (500) is in the third state, the oil delivery pipe (310) is connected to the small fuel tank (200), and the air removal port (440) is connected to the air removal switching mechanism (500); The air removal switching mechanism (500) includes a base (510) and a rotary valve (520). The rotary valve (520) is rotatably arranged in the base (510). By rotating the rotary valve (520), the switching between the three states of the air removal switching mechanism (500) can be realized.

2. The fuel supply system according to claim 1, wherein The heating component is a heating pipe (250). The heating pipe (250) is arranged in the inner cavity of the small fuel tank (200), and the heating pipe (250) is used to heat the fuel in the small fuel tank (200).

3. The fuel supply system according to claim 1, characterized in that, The main fuel supply mechanism further includes a check valve. The large fuel tank (100) and the small fuel tank (200) are communicated through a connecting pipe (600). The check valve is arranged in the connecting pipe (600), and the check valve is used for controlling the one-way fuel supply from the large fuel tank (100) to the small fuel tank (200).

4. The fuel supply system according to claim 1, characterized in that, The main fuel supply mechanism further includes a first liquid level sensor (260). The first liquid level sensor (260) is integrated in the small fuel tank (200) and is used for detecting the liquid level in the small fuel tank (200); and / or, the auxiliary fuel supply mechanism further includes a second liquid level sensor (320). The second liquid level sensor (320) is integrated in the auxiliary fuel tank (300) and is used for detecting the liquid level in the auxiliary fuel tank (300).

5. The fuel supply system according to claim 1, characterized in that, The small fuel tank (200) is provided with a first fuel injection port. A first fuel tank cover (270) is movably arranged at the first fuel injection port, and the first fuel tank cover (270) can open or cover the first fuel injection port.

6. The fuel supply system according to claim 1, characterized in that The large fuel tank (100) is provided with a second fuel injection port. A second fuel tank cover (110) is movably arranged at the second fuel injection port, and the second fuel tank cover (110) can open or cover the second fuel injection port.

7. The fuel supply system according to claim 1, characterized in that, The large fuel tank (100) is provided with a water inlet (120) and a water outlet (130). The water inlet (120) and the water outlet (130) are respectively communicated with the engine (1).

8. A vehicle, characterized in that, A fuel supply system according to any one of claims 1-7 is included.

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