Dual tank fuel supply system and vehicle

Abstract

The embodiment of the application provides a double-oil-tank oil supply system and a vehicle. The double-oil-tank oil supply system comprises a main oil tank and an auxiliary oil tank; the main oil tank and the auxiliary oil tank are connected through an oil suction passage to suck oil from the auxiliary oil tank into the main oil tank; the main oil tank and the auxiliary oil tank are connected through an anti-overflow passage, and the anti-overflow passage at a first connection position of the main oil tank is not lower than the anti-overflow passage at a second connection position of the auxiliary oil tank, thereby solving the problem that fuel overflow of the main oil tank is caused when the auxiliary oil tank delivers fuel to the main oil tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a double-oil-tank fuel supply system and a vehicle. BACKGROUND

[0002] With the continuous development of intelligent automobile technology, people's requirements for the endurance of vehicles are getting higher and higher, therefore, the double-oil-tank design of vehicles gradually becomes an important solution. The double-oil-tank design increases the oil tank capacity by designing two oil tanks to provide longer driving mileage for vehicles. In the case of remote areas or sparse gas stations, vehicles with double-oil-tank systems can have enough fuel to reach the destination.

[0003] In the double-oil-tank system in the prior art, the fuel in the auxiliary oil tank is delivered to the main oil tank through an oil suction device, and the working principle of the oil suction device is as follows: the oil suction device is driven by the engine oil return amount to suck fuel from the auxiliary oil tank and then deliver the fuel to the main oil tank.

[0004] However, the engine oil return amount is positively correlated with the engine speed, and when the engine speed is high, the engine oil return amount also increases, thus causing the amount of fuel sucked from the auxiliary oil tank by the oil suction device to increase, which in turn causes the fuel in the main oil tank to overflow, resulting in fuel waste. SUMMARY

[0005] The embodiments of the present application provide a double-oil-tank fuel supply system and a vehicle to solve the problem of fuel overflow in the main oil tank when too much fuel is supplemented from the auxiliary oil tank to the main oil tank.

[0006] In a first aspect, the embodiments of the present application provide a double-oil-tank fuel supply system, comprising: a main oil tank (1) and an auxiliary oil tank (2);

[0007] The main oil tank (1) and the auxiliary oil tank (2) are connected through an oil suction passage (3) to suck oil from the auxiliary oil tank (2) to the main oil tank (1);

[0008] The main oil tank (1) and the auxiliary oil tank (2) are connected through an anti-overflow passage (4), and the first connection position of the anti-overflow passage (4) in the main oil tank is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary oil tank (2).

[0009] In a possible implementation, a one-way valve (5) is arranged on the anti-overflow passage (4) to limit the flow of oil in the auxiliary oil tank (2) to the main oil tank (1) through the anti-overflow passage (4).

[0010] In a possible implementation, the first connection position is close to the top of the main oil tank (1), and the second connection position is close to the top of the auxiliary oil tank (2).

[0011] In a possible implementation, the anti-overflow passage is further provided with an oil storage device (6), the oil storage device (6) comprises the movable bottom (7) and the spring (8), when the amount of oil in the anti-overflow passage (4) is greater than or equal to a preset oil amount, the spring (8) is compressed by the oil in the anti-overflow passage (4), the movable bottom (7) is located at the lowermost part of the oil storage device (6), part of the oil in the anti-overflow passage (4) flows into the oil storage device (6), when the amount of oil in the anti-overflow passage (4) is less than the preset oil amount, the spring (8) pushes the movable bottom (7) out, so that the oil in the oil storage device (6) flows into the auxiliary oil tank (2).

[0012] In a possible implementation, the spring (8) is flush with the movable bottom (7) and the inner surface of the anti-overflow passage (4) when the spring (8) returns to its original state.

[0013] In a possible implementation, a plurality of flow sensors (9) are sequentially arranged on the anti-overflow passage (4), when the flow measured by the flow sensor (9) close to the first connection position is greater than the flow measured by the flow sensor (9) away from the first connection position, a prompt information is sent, the prompt information is used to indicate that the anti-overflow passage (4) is leaking.

[0014] In a possible implementation, the first connection position is provided with a first connection hole (10), the second connection position is provided with a second connection hole (11), and the two ends of the straight pipeline are movably fixed in the first connection hole (10) and the second connection hole (11).

[0015] In a possible implementation, the diameter of the anti-overflow passage (4) is greater than or equal to the diameter of the oil suction passage (3).

[0016] In a possible implementation, the oil suction passage (3) comprises a first oil pipe (12) and a second oil pipe (13), and the system further comprises an engine (14).

[0017] The oil outlet of the auxiliary oil tank (2) is connected to the oil suction device (15) through the first oil pipe (12), and the oil suction device (15) is connected to the oil inlet of the main oil tank (1) through the second oil pipe (13).

[0018] The oil inlet of the engine (14) is connected to the oil outlet of the main oil tank (1).

[0019] The oil return port of the engine (14) is connected to the oil suction device (15), so as to drive the oil suction from the auxiliary oil tank (2) to the main oil tank (1) under the action of the oil return of the engine (14).

[0020] In a second aspect, the embodiments of the present application provide a vehicle comprising the dual-tank fuel supply system provided by the first aspect of the embodiments of the present application.

[0021] The dual-tank fuel supply system and the vehicle provided by the embodiments of the present application, the main tank (1) of the dual-tank fuel supply system stores the main amount of fuel required by the engine (14), and the auxiliary tank (2) of the dual-tank fuel supply system serves as a backup tank and stores additional fuel, so that the auxiliary tank (2) provides fuel for the main tank (1) when the main tank (1) is insufficient in fuel. The main tank (1) and the auxiliary tank (2) are connected through the oil suction passage (3) to suck oil from the auxiliary tank (2) to the main tank (1) when the main tank (1) is insufficient in fuel. The main tank (1) and the auxiliary tank (2) are also connected through the anti-overflow passage (4), and the first connection position of the anti-overflow passage (4) in the main tank (1) is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary tank (2). By arranging the anti-overflow passage (4) between the main tank (1) and the auxiliary tank (2), when the fuel level in the main tank (1) is higher than the fuel level in the auxiliary tank (2), the fuel will flow back from the main tank (1) to the auxiliary tank (2) through the anti-overflow passage (4) due to gravity, thereby avoiding excessive fuel in the main tank (1) and causing fuel overflow in the main tank (1). BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the present application.

[0023] Figure 1 The dual-tank fuel supply system structure schematic diagram provided by the embodiments of the present application;

[0024] Figure 2 The storage device structure schematic diagram;

[0025] Figure 3 The structure schematic diagram when there is no fuel in the storage device.

[0026] Reference signs:

[0027] 1-main tank; 2-auxiliary tank; 3-oil suction passage; 4-anti-overflow passage; 5-one-way valve; 6-storage device; 7-movable bottom; 8-spring; 9-flow sensor; 10-first connection hole; 11-second connection hole; 12-first oil pipe; 13-second oil pipe; 14-engine; 15-oil suction device.

[0028] The specific embodiments of the present application have been described hereinabove by reference to the accompanying drawings. The drawings and detailed description are not meant to limit the present application to any particular embodiments, but are merely intended to explain the concepts of the present application by reference to particular embodiments. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings of the preferred embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present application shall fall within the scope of protection of the present application.

[0030] It should be noted that, in the description of the embodiments of the present application, the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description, and are not intended to indicate or imply that the device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] In addition, it should also be noted that the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, therefore, the features with "first" and "second" can explicitly or implicitly include one or more of the features, and in the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection or can communicate with each other; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the prior art, the oil suction device is used to suck fuel from the auxiliary oil tank, and then deliver it to the main oil tank. Since the power of the oil suction device comes from the engine oil return amount, and the engine oil return amount is positively correlated with the engine speed, when the engine is at high speed, the engine oil return amount also increases accordingly, which leads to an increase in the fuel sucked from the auxiliary oil tank by the oil suction device, and further causes the fuel in the main oil tank to overflow, resulting in fuel waste.

[0034] Based on this, the application concept of the application is how to provide a double-oil-tank fuel supply system and a vehicle, how to transport excess fuel from the auxiliary oil tank to the main oil tank, causing the fuel in the main oil tank to be too much, and how to transport the fuel in the main oil tank back to the auxiliary oil tank. Based on this, by providing an anti-overflow passage in the main oil tank and the auxiliary oil tank, and the first connection position of the anti-overflow passage in the main oil tank is higher than the second connection position of the anti-overflow passage in the auxiliary oil tank, therefore, when the fuel in the main oil tank reaches the first connection position, due to the action of gravity, the fuel flows to the anti-overflow passage through the first connection position, and finally flows to the auxiliary oil tank, thereby avoiding the problem of fuel overflow in the main oil tank.

[0035] The technical solutions of the application and how the technical solutions of the application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the application will be described below with reference to the drawings.

[0036] Figure 1 The double-oil-tank fuel supply system structure schematic diagram provided by the embodiments of the application is shown in FIG. 1, the double-oil-tank fuel supply system provided by the embodiments of the application includes a main oil tank (1) and an auxiliary oil tank (2). Figure 1

[0037] Specifically, the main oil tank (1) and the auxiliary oil tank (2) are connected through an oil suction passage (3) to suck oil from the auxiliary oil tank (2) to the main oil tank (1); the main oil tank (1) and the auxiliary oil tank (2) are connected through an anti-overflow passage (4), and the first connection position of the anti-overflow passage (4) in the main oil tank (1) is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary oil tank (2).

[0038] In the embodiments of the application, the main oil tank (1) of the double-oil-tank fuel supply system stores the main amount of oil required by the engine (14), and the auxiliary oil tank (2) of the double-oil-tank fuel supply system stores additional fuel as a backup oil tank to provide fuel for the main oil tank (1) when the oil amount of the main oil tank (1) is insufficient. The main oil tank (1) and the auxiliary oil tank (2) are connected through an oil suction passage (3) to suck oil from the auxiliary oil tank (2) to the main oil tank (1) when the oil amount of the main oil tank (1) is insufficient. The main oil tank (1) and the auxiliary oil tank (2) are also connected through an anti-overflow passage (4), and the first connection position of the anti-overflow passage (4) in the main oil tank (1) is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary oil tank (2). By providing the anti-overflow passage (4) between the main oil tank (1) and the auxiliary oil tank (2), when the fuel level in the main oil tank (1) is higher than the fuel level in the auxiliary oil tank (2), due to the action of gravity, the fuel will flow back from the main oil tank (1) to the auxiliary oil tank (2) through the anti-overflow passage (4), thereby avoiding the problem of excessive fuel in the main oil tank (1) causing fuel overflow in the main oil tank (1). ​

[0039] In the embodiment of the present application, the main oil tank (1) and the auxiliary oil tank (2) are connected through the oil suction passage (3) to suck oil from the auxiliary oil tank (2) into the main oil tank (1); the main oil tank (1) and the auxiliary oil tank (2) are connected through the anti-overflow passage (4), and the first connection position of the anti-overflow passage (4) in the main oil tank (1) is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary oil tank (2). Compared with the prior art, when the auxiliary oil tank (2) delivers too much fuel to the main oil tank (1), causing the fuel in the main oil tank (1) to overflow, the present application sets the anti-overflow passage (4) between the main oil tank (1) and the auxiliary oil tank (2), and sets the first connection position of the anti-overflow passage (4) in the main oil tank (1) to be higher than the second connection position in the auxiliary oil tank (2), so that when the fuel in the main oil tank (1) reaches the first connection position, due to the factor of gravity, the fuel in the main oil tank (1) can flow into the auxiliary oil tank (2) through the anti-overflow passage (4), thus avoiding the problem of too much fuel in the main oil tank (1) causing fuel overflow.

[0040] Referring to Figure 1 In the embodiment of the present application, a one-way valve (5) is arranged on the anti-overflow passage (4) to limit the oil in the auxiliary oil tank (2) from flowing to the main oil tank (1) through the anti-overflow passage (4).

[0041] In the embodiment of the present application, a one-way valve (5) is arranged on the anti-overflow passage (4) to limit the oil in the auxiliary oil tank (2) from flowing to the main oil tank (1) through the anti-overflow passage (4). Optionally, the one-way valve (5) is a spring type one-way valve, a ball type one-way valve or a diaphragm type one-way valve. More optionally, the one-way valve (5) can be installed on the anti-overflow passage (4) by screw connection, and in order to ensure that the one-way valve (5) can be tightly closed on the anti-overflow passage (4) to prevent fuel leakage, a gasket is installed at the connection between the one-way valve (5) and the anti-overflow passage (4) to prevent fuel leakage from the one-way valve (5).

[0042] Referring to Figure 1 In the embodiment of the present application, the first connection position is close to the top of the main oil tank (1), and the second connection position is close to the top of the auxiliary oil tank (2).

[0043] In the embodiment of the present application, since the bottom of the oil tank is more prone to accumulate sediment, impurities and moisture, the first connection position is arranged close to the top of the main oil tank (1), and the second connection position is arranged close to the top of the auxiliary oil tank (2), which can avoid the problem of the sediment, impurities and moisture entering the anti-overflow passage (4) through the first connection position, thereby causing the anti-overflow passage (4) to be blocked.

[0044] Referring to Figure 1In the embodiment of the present application, the oil storage device (6) is additionally arranged on the anti-overflow passage (4) to balance the fuel distribution of the double-tank fuel supply system. Specifically, the oil storage device (6) comprises a movable bottom (7) and a spring (8). The movable bottom (7) can tightly adhere to the outer shell of the oil storage device (6) to prevent fuel leakage. The spring (8) is arranged below the movable bottom (7) to provide upward thrust.

[0045] In the embodiment of the present application, Figure 2 For the structure diagram of the oil storage device, the oil storage device (6) is additionally arranged on the anti-overflow passage (4) to balance the fuel distribution of the double-tank fuel supply system. Specifically, the oil storage device (6) comprises a movable bottom (7) and a spring (8). The movable bottom (7) can tightly adhere to the outer shell of the oil storage device (6) to prevent fuel leakage. The spring (8) is arranged below the movable bottom (7) to provide upward thrust.

[0046] The working principle of the oil storage device (6) is as follows: when the oil amount in the anti-overflow passage (4) is greater than or equal to the preset oil amount, the pressure of the fuel increases, the movable bottom (7) of the oil storage device (6) is pushed to move downward to overcome the elastic force of the spring (8), the spring (8) is compressed, and at the same time, the movable bottom (7) moves downward to provide additional storage space for the fuel, thereby reducing the oil amount in the anti-overflow passage (4), preventing the fuel in the anti-overflow passage (4) from being too much, causing fuel blockage, and further causing the fuel in the main tank (1) to overflow. As the oil amount in the anti-overflow passage (4) decreases, the pressure of the oil liquid on the movable bottom (7) of the oil storage device (6) decreases, at this time, the spring (8) gradually restores to the original length to push the movable bottom (7) to move upward, the fuel in the oil storage device (6) is pushed out into the anti-overflow passage (4), and then flows back into the auxiliary tank (2). By arranging the oil storage device (6) on the anti-overflow passage (4), it helps to solve the problem that when the fuel in the anti-overflow passage (4) is too much, it cannot be returned to the auxiliary tank (2) in time, causing the anti-overflow passage (4) to be blocked, and ultimately causing the fuel in the main tank (1) to be unable to be discharged to the anti-overflow passage (4), resulting in fuel overflow in the main tank (1). And the oil storage device (6) uses the movable bottom (7) and the spring (8), and the volume of the oil storage device (6) is automatically adjusted by the fuel pressure in the anti-overflow passage (4), without the need for manual opening and closing of the oil storage device (6), thereby improving the automation degree of the double-tank fuel supply system.

[0047] Referring to Figure 3 , Figure 3The structure diagram of the oil storage device (6) when the oil is out of stock is shown in the embodiment of the present application, and the spring (8) is in the original state and is flush with the inner surface of the movable bottom (7) and the anti-overflow passage (4).

[0048] In the embodiment of the present application, as the amount of oil in the anti-overflow passage (4) decreases, the pressure of the oil on the movable bottom (7) of the oil storage device (6) decreases, and the spring (8) gradually recovers to the original length, and the movable bottom (7) is flush with the inner surface of the anti-overflow passage (4), at this time, the flow resistance of the fuel in the anti-overflow passage (4) is minimized, which is more conducive to the smooth flow of the fuel in the anti-overflow passage (4).

[0049] Referring to Figure 1 In the embodiment of the present application, a plurality of flow sensors (9) are arranged on the anti-overflow passage (4) in sequence, and when the flow measured by the flow sensor (9) close to the first connection position is greater than the flow measured by the flow sensor (9) away from the first connection position, a prompt information is sent, and the prompt information is used to indicate that the anti-overflow passage (4) is leaking.

[0050] In the embodiment of the present application, a plurality of flow sensors (9) are arranged on the anti-overflow passage (4) in sequence from the position close to the first connection position, i.e., the main oil tank (1), and when the flow measured by the flow sensor (9) close to the first connection position is greater than the flow measured by the flow sensor (9) away from the first connection position, a prompt information is sent, and the prompt information is used to indicate that the anti-overflow passage (4) is leaking. For example, two flow sensors (9) can be arranged, i.e., a first flow sensor is arranged at a position close to the main oil tank (1), and a second flow sensor is arranged at a position close to the auxiliary oil tank (2), the first flow sensor and the second flow sensor monitor the fuel flow at their positions in real time, and when the flow measured by the first flow sensor is greater than the flow measured by the second flow sensor, it indicates that the anti-overflow passage (4) may have a crack or other problems that cause fuel leakage, and the operator needs to be reminded to check and repair in time.

[0051] Referring to Figure 1 In the embodiment of the present application, the first connection position is provided with a first connection hole (10), the second connection position is provided with a second connection hole (11), and the two ends of the straight pipe are movably fixed in the first connection hole (10) and the second connection hole (11).

[0052] In the embodiment of the present application, the anti-overflow passage (4) is provided as a straight pipeline, and a first connecting hole (10) is arranged at the first connecting position and a second connecting hole (11) is arranged at the second connecting position to fix the anti-overflow passage (4). Optionally, the anti-overflow passage (4) can be movably fixed in the first connecting hole (10) and the second connecting hole (11) through bolts or buckles, so that the anti-overflow passage (4) can be flexibly installed and removed when a fault occurs, for example, a crack occurs.

[0053] Referring to Figure 1 In the embodiment of the present application, the diameter of the anti-overflow passage (4) is greater than or equal to the diameter of the oil suction passage (3).

[0054] In the embodiment of the present application, the diameter of the anti-overflow passage (4) is greater than or equal to the diameter of the oil suction passage (3), so that when the oil is rapidly returned, the oil cannot pass through the anti-overflow passage (4) in time due to the small diameter of the anti-overflow passage (4), thereby causing the oil to overflow or the system pressure to abnormally rise, and causing the anti-overflow passage (4) to crack. By increasing the diameter of the anti-overflow passage (4), it can be ensured that the oil can pass through smoothly when necessary, and the overflow of the main oil tank (1) can be avoided.

[0055] Referring to Figure 1 In the embodiment of the present application, the oil suction passage (3) comprises a first oil pipe (12) and a second oil pipe (13), and the system further comprises an engine (14).

[0056] Specifically, the oil outlet of the auxiliary oil tank (2) is connected to the oil suction device (15) through the first oil pipe (12), the oil suction device (15) is connected to the oil inlet of the main oil tank (1) through the second oil pipe (13), the oil inlet of the engine (14) is connected to the oil outlet of the main oil tank (1), and the oil return port of the engine (14) is connected to the oil suction device (15) to drive the oil suction device (15) to suck the oil from the auxiliary oil tank (2) to the main oil tank (1).

[0057] In the embodiment of the present application, the double-tank fuel supply system further comprises an engine (14), the fuel suction passage (3) between the main tank (1) and the auxiliary tank (2) comprises a first oil pipe (12) and a second oil pipe (13). The oil outlet of the auxiliary tank (2) is connected to the fuel suction device (15) through the first oil pipe (12), so as to ensure that the fuel flows from the auxiliary tank (2) to the fuel suction device (15); the fuel suction device (15) is connected to the oil inlet of the main tank (1) through the second oil pipe (13), so as to ensure that the fuel in the fuel suction device (15) is transported into the main tank (1); the oil inlet of the engine (14) is connected to the oil outlet of the main tank (1), and the engine (14) is used to suck the fuel from the main tank (1); the oil return port of the engine (14) is connected to the fuel suction device (15), which is used to return the unused fuel of the engine (14) to the fuel suction device (15), so that under the oil return drive of the engine (14), the fuel suction device (15) is used to suck the fuel from the auxiliary tank (2) into the main tank (1).

[0058] The detailed working principle is as follows: when the engine (14) is running, the engine (14) obtains the fuel from the main tank (1) for combustion, and transports the unused fuel of the engine (14) to the fuel suction device (15), the fuel suction device (15) transports the fuel of the auxiliary tank (2) into the main tank (1) under the oil return drive of the engine (14), the engine (14) is continuously running, the fuel suction device (15) continuously receives the oil return of the engine (14), therefore the fuel suction device (15) continuously transports the fuel in the auxiliary tank (2) into the main tank (1), when the fuel in the main tank (1) reaches a certain degree, the fuel in the main tank (1) is returned to the auxiliary tank (2) through the anti-overflow passage (4), so as to prevent the fuel suction device (15) from continuously sucking the fuel from the auxiliary tank (2) into the main tank (1) under the return drive of the engine (14), so that the fuel in the main tank (1) overflows, causing fuel waste.

[0059] Based on the same inventive concept, the embodiment of the present application also provides a vehicle comprising the above-mentioned double-tank fuel supply system provided by the embodiment of the present application. The vehicle provided by the embodiment of the present application can be applied to all application scenarios using the above-mentioned double-tank fuel supply system.

[0060] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow conversion using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

[0061] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual-tank fuel supply system, characterized in that, include: Main fuel tank (1) and auxiliary fuel tank (2); The main oil tank (1) and the auxiliary oil tank (2) are connected by an oil suction passage (3) to draw oil from the auxiliary oil tank (2) into the main oil tank (1); The main oil tank (1) and the auxiliary oil tank (2) are connected by an anti-overflow passage (4), and the anti-overflow passage (4) at the first connection position of the main oil tank is not lower than the second connection position of the anti-overflow passage (4) in the auxiliary oil tank (2). An oil storage device (6) is also provided on the overflow prevention passage. The oil storage device (6) includes a movable bottom (7) and a spring (8). When the amount of oil in the overflow prevention passage (4) is greater than or equal to the preset amount of oil, the spring (8) is compressed by the oil in the overflow prevention passage (4). The movable bottom (7) is located at the bottom of the oil storage device (6). Part of the oil in the overflow prevention passage (4) flows into the oil storage device (6). When the amount of oil in the overflow prevention passage (4) is less than the preset amount of oil, the spring (8) pushes out the movable bottom (7) so that the oil in the oil storage device (6) flows into the auxiliary oil tank (2).

2. The system according to claim 1, characterized in that, A one-way valve (5) is provided on the overflow prevention passage (4) to restrict the oil in the auxiliary oil tank (2) from flowing to the main oil tank (1) through the overflow prevention passage (4).

3. The system according to claim 1, characterized in that, The first connection position is close to the top of the main oil tank (1), and the second connection position is close to the top of the auxiliary oil tank (2).

4. The system according to claim 1, characterized in that, When the spring (8) returns to its original state, it is flush with the inner surface of the movable bottom (7) and the anti-overflow passage (4).

5. The system according to any one of claims 1 to 3, characterized in that, Multiple flow sensors (9) are sequentially arranged on the overflow prevention passage (4). When the flow rate measured by the flow sensor (9) near the first connection position is greater than the flow rate measured by the flow sensor (9) far from the first connection position, a prompt message is sent. The prompt message is used to indicate that the overflow prevention passage (4) is leaking.

6. The system according to claim 4, characterized in that, A first connection hole (10) is provided at the first connection position, and a second connection hole (11) is provided at the second connection position. The two ends of the straight pipe are movably fixed at the first connection hole (10) and the second connection hole (11).

7. The system according to any one of claims 1 to 3, characterized in that, The diameter of the anti-overflow passage (4) is greater than or equal to the diameter of the oil absorption passage (3).

8. The system according to any one of claims 1 to 3, characterized in that, The oil suction passage (3) includes: a first oil pipe (12) and a second oil pipe (13); the system also includes: an engine (14); The outlet of the auxiliary oil tank (2) is connected to the oil suction device (15) through the first oil pipe (12), and the oil suction device (15) is connected to the inlet of the main oil tank (1) through the second oil pipe (13). The oil inlet of the engine (14) is connected to the oil outlet of the main oil tank (1); The oil return port of the engine (14) is connected to the oil suction device (15) to draw oil from the auxiliary oil tank (2) into the main oil tank (1) under the oil return drive of the engine (14).

9. A vehicle, characterized in that, Includes the dual-tank fuel supply system as described in any one of claims 1 to 8.

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