Engine oil supply system and vehicle

Abstract

The utility model discloses an engine oil supply system and vehicle relates to vehicle engine oil supply technical field, and the engine oil supply system includes: auxiliary oil tank, main oil tank and venturi tube structure, the first oil supply pipe is communicated to the auxiliary oil tank, and the oil supply pump is equipped in the auxiliary oil tank, the second oil supply pipe is communicated to the main oil tank, and the oil supply pump in the auxiliary oil tank is suitable for pumping the oil into the main oil tank, the venturi tube structure includes two inlets and an outlet, and the two inlets of venturi tube structure are communicated first oil supply pipe and second oil supply pipe respectively, and the outlet of venturi tube structure is communicated the oil inlet of engine through oil pump, and the oil return of engine is communicated auxiliary oil tank, the engine oil supply system of the utility model embodiment, and the first oil supply pipe of main oil tank and the second oil supply pipe of auxiliary oil tank are connected through venturi tube structure and are in proportion for the oil supply of engine, and set up the oil supply pump in the auxiliary oil tank, realize the intercommunication of main oil tank and auxiliary oil tank, improve the reliability of double oil tank system, and reduce the cost.

Description

Technical Field

[0001] This utility model relates to the field of vehicle engine fuel supply technology, and in particular to an engine fuel supply system and a vehicle. Background Technology

[0002] As the economy develops, people's demands for cars are also increasing, and car manufacturers are developing more types of products to meet the needs of different groups. In order to meet the demand for ultra-long driving range, some models have added a dual fuel tank design.

[0003] The original dual-tank system switched between the main and auxiliary tanks by switching a six-way valve. When switched to the auxiliary tank, only the auxiliary tank supplied fuel, and when switched to the main tank, only the main tank supplied fuel. The six-way valve was expensive and had a failure rate as high as 3%, which would cause a lot of complaints from customers in passenger vehicles. At the same time, the fuel supply from the main tank and the auxiliary tank could not be kept within an optimal ratio, so there was room for improvement. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an engine fuel supply system in which the fuel supply pipes of the main fuel tank and the auxiliary fuel tank are connected together via a Venturi tube structure to supply fuel to the engine in a proportional manner. Furthermore, a fuel pump is installed in the auxiliary fuel tank, thereby improving the reliability of the dual-tank system and reducing costs.

[0005] An engine fuel supply system according to an embodiment of the present invention includes: an auxiliary fuel tank, a main fuel tank, and a venturi tube structure; the auxiliary fuel tank is connected to a first fuel supply pipe and a fuel supply pump; the main fuel tank is provided with a second fuel supply pipe, and the fuel supply pump in the auxiliary fuel tank is adapted to pump fuel into the main fuel tank; the venturi tube structure includes two inlets and one outlet, the two inlets of the venturi tube structure are respectively connected to the first fuel supply pipe and the second fuel supply pipe, and one outlet of the venturi tube structure is connected to the engine's fuel inlet via a suction pump, and the engine's fuel return port is connected to the auxiliary fuel tank.

[0006] According to the engine fuel supply system of this utility model embodiment, the second fuel supply pipe of the main fuel tank and the first fuel supply pipe of the auxiliary fuel tank are connected by a venturi tube structure. The negative pressure of the suction pump is used to supply fuel to the engine. The fuel flows back to the auxiliary fuel tank through the engine. The auxiliary fuel tank integrates a fuel supply pump to supply fuel to the main fuel tank, realizing the connection between the main fuel tank and the auxiliary fuel tank, ensuring the operation of the dual fuel tank system, improving the reliability of the dual fuel tank system, and reducing costs.

[0007] According to an embodiment of the present invention, the engine fuel supply system includes a venturi tube structure comprising a first inlet pipe, a throat section, an outlet pipe, and a second inlet pipe connected sequentially along the axial direction; the diameter of the first inlet pipe gradually decreases at the end facing the throat section, and the diameter of the throat section gradually increases at the end facing the outlet pipe; the first inlet pipe is connected to the second fuel supply pipe, and the outlet pipe is connected to the engine's fuel inlet; one end of the second inlet pipe is connected to the throat section, and the other end is connected to the first fuel supply pipe; the inner diameter of the second inlet pipe is smaller than the inner diameter of the first inlet pipe and the throat section.

[0008] According to the engine fuel supply system of this utility model embodiment, the second inlet pipe is located at the exact middle part of the throat section along the axial direction.

[0009] According to the engine fuel supply system of this utility model embodiment, the main fuel tank is provided with a first liquid level sensor, and the auxiliary fuel tank is provided with a second liquid level sensor.

[0010] According to the engine fuel supply system of this utility model embodiment, a control valve is provided between the auxiliary fuel tank and the venturi tube structure. The control valve controls the oil in the auxiliary fuel tank to enter the venturi tube structure. The control valve is a normally open valve, which is suitable for opening the first fuel supply pipe when the power is off and closing the first fuel supply pipe when the power is on.

[0011] According to the engine fuel supply system of this utility model embodiment, the outlet of the venturi tube structure is connected to the fuel inlet of the engine through a third fuel supply pipe, and the third fuel supply pipe is equipped with a pressure sensor.

[0012] According to the engine fuel supply system of this utility model embodiment, a pressure balance pipe is connected between the upper parts of the auxiliary fuel tank and the main fuel tank, and the top of the pressure balance pipe is higher than the top of the auxiliary fuel tank and the main fuel tank.

[0013] The engine fuel supply system according to an embodiment of the present utility model further includes a fuel filler pipe, the fuel filler pipe including a common filler pipe, and a first branch and a second branch connecting the common filler pipe, the first branch connecting the auxiliary fuel tank and the second branch connecting the main fuel tank.

[0014] The engine fuel supply system according to an embodiment of the present invention further includes a first return pipe and a second return pipe. One end of the first return pipe is connected to the auxiliary fuel tank and the other end is connected to the common filling pipe. One end of the second return pipe is connected to the main fuel tank and the other end is connected to the common filling pipe.

[0015] This utility model also discloses a vehicle including the above-described engine fuel supply system.

[0016] The advantages of the vehicle compared to the prior art are the same as the advantages of the engine fuel supply system compared to the prior art, and will not be elaborated here.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a simplified structural diagram of the engine fuel supply system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the Venturi tube structure of the engine fuel supply system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the fuel supply logic of the engine fuel supply system according to an embodiment of the present invention.

[0019] icon: Engine fuel supply system 100, Auxiliary fuel tank 1, fuel pump 11, second level sensor 12, first fuel supply pipe 13, fourth fuel supply pipe 14, main fuel tank 2, first level sensor 21, second fuel supply pipe 22, engine 3, return fuel line 30, venturi tube structure 4, third fuel supply pipe 40, first inlet pipe 41, throat section 42, outlet pipe 43, second inlet pipe 44, control valve 5, pressure sensor 6, suction pump 7, pressure balance pipe 8, main pressure pipe 81, manifold 82, refueling pipe 9, common filling pipe 91, first branch 92, second branch 93, first return air pipe 10, second return air pipe 20. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Unless otherwise specified, the front-back direction in this application refers to the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction refers to the lateral direction of the vehicle, i.e., the Y direction; and the up-down direction refers to the vertical direction of the vehicle, i.e., the Z direction.

[0023] The following is for reference. Figures 1-3 The present invention describes an engine fuel supply system 100 according to an embodiment of the present invention. This embodiment employs an external Venturi tube structure 4 in the fuel supply line to ensure that the main fuel tank 2 and the auxiliary fuel tank 1 are supplied with fuel in a certain proportion. Simultaneously, an electromagnetic valve and a fuel supply pump 11 are added to ensure that fuel can be transferred from one fuel tank to the other when the other is empty. Furthermore, a pressure sensor 6 is added between the Venturi tube structure 4 and the fuel pump 7 to prevent accidental activation of the electromagnetic valve and fuel supply pump 11, which could cause the fuel tank to overflow beyond its rated flow rate. The control strategy, verified through theoretical calculations and experiments, allows the fuel in the main fuel tank 2 and the auxiliary fuel tank 1 to be consumed simultaneously, eliminating the need for manual operation, improving driver comfort, and maximizing driving range.

[0024] like Figure 1-3 As shown, an engine fuel supply system 100 according to an embodiment of the present invention includes: an auxiliary fuel tank 1, a main fuel tank 2, and a venturi tube structure 4.

[0025] The auxiliary oil tank 1 is connected to the first oil supply pipe 13, and the auxiliary oil tank 1 is equipped with an oil supply pump 11; the main oil tank 2 is connected to the second oil supply pipe 22, and the oil supply pump 11 in the auxiliary oil tank 1 is adapted to pump oil into the main oil tank 2; the venturi tube structure 4 includes two inlets and one outlet. The two inlets of the venturi tube structure 4 are respectively connected to the first oil supply pipe 13 and the second oil supply pipe 22, and one outlet of the venturi tube structure 4 is connected to the oil inlet of the engine 3 through the suction pump 7, and the oil return port of the engine 3 is connected to the auxiliary oil tank 1.

[0026] In practice, when the engine 3 is supplied with fuel by the main fuel tank 2 and the auxiliary fuel tank 1 at the same time, if one of the fuel tanks fails, the other fuel tank can still continue to supply fuel, ensuring that the engine 3 continues to run. When supplying fuel to the engine 3, the fuel can be drawn in by the fuel suction pump 7. Moreover, if there is only one fuel tank, if the system of one fuel tank fails, it may cause the engine 3 to stop. The dual fuel tank system reduces the risk of the entire system being paralyzed due to the failure of a single component.

[0027] Specifically, the auxiliary fuel tank 1 supplies fuel to the engine 3 through the first fuel supply pipe 13, and the main fuel tank 2 supplies fuel to the engine 3 through the second fuel supply pipe 22. The fuel pump 11 in the auxiliary fuel tank 1 is connected to the main fuel tank 2 through the fourth fuel supply pipe 14. Furthermore, the outlets of both the first fuel supply pipe 13 and the second fuel supply pipe 22 are connected to the Venturi tube structure 4. The Venturi tube structure 4 can realize core functions such as fluid acceleration, pressure regulation, flow measurement, mixing, and energy saving. Setting the Venturi tube structure 4 can change the fuel supply ratio from the first fuel supply pipe 13 to the engine 3 from the second fuel supply pipe 22. For example, when the volume of the main fuel tank 2 is 120L and the volume of the auxiliary fuel tank 1 is 80L... The fuel supply flow rate of the second fuel supply pipe 22 of the main fuel tank 2 is 116L, the fuel supply flow rate of the first fuel supply pipe 13 of the auxiliary fuel tank 1 is 4L, the fuel consumption of the engine 3 is 10L, the return fuel of the engine 3 flows back to the auxiliary fuel tank 1 through the return fuel pipe 30, and the fuel supply pump 11 of the auxiliary fuel tank 1 supplies 110L. Therefore, we can draw the following conclusions: 116L flows out of the main fuel tank 2 and 110L flows in, reducing the total volume by 6L; 114L (4L+110L) flows out of the auxiliary fuel tank 1 and 110L flows in, consuming 6L of fuel from the main fuel tank 2 and 4L of fuel from the auxiliary fuel tank 1 in proportion. In the end, the main fuel tank 2 and the auxiliary fuel tank 1 can both run out of fuel at the same time.

[0028] Therefore, by controlling the proportion, since the returned fuel is less than the output fuel, the main fuel tank 2 and the auxiliary fuel tank 1 will not exceed the original fuel tank volume.

[0029] Furthermore, through theoretical calculations and subsequent experimental verification, the flow rate of the fuel supply pump 11 and the design of the venturi tube structure 4 can be adjusted according to the volume of the main fuel tank 2 and the auxiliary fuel tank 1 to ensure the fuel supply ratio of the main fuel tank 2 and the auxiliary fuel tank 1, thereby achieving simultaneous depletion of fuel in both main fuel tank 2 and auxiliary fuel tank 1 and ensuring maximum range. Simultaneously, the negative pressure of the suction pump 7 supplies fuel to the engine 3, and the fuel flows back to the auxiliary fuel tank 1 through the engine 3. The auxiliary fuel tank 1 integrates a fuel supply pump 11 to supply fuel to the main fuel tank 2, ensuring the operation of the dual-tank system, improving the reliability of the dual-tank system, and reducing costs.

[0030] In some embodiments, the Venturi tube structure 4 includes a first inlet pipe 41, a throat section 42, an outlet pipe 43, and a second inlet pipe 44 connected sequentially along the axial direction; the diameter of the first inlet pipe 41 gradually decreases at the end facing the throat section 42, and the diameter of the throat section 42 gradually increases at the end facing the outlet pipe 43; the first inlet pipe 41 is connected to the second oil supply pipe 22, and the outlet pipe 43 is connected to the oil inlet of the engine 3; one end of the second inlet pipe 44 is connected to the throat section 42 and the other end is connected to the first oil supply pipe 13; the inner diameter of the second inlet pipe 44 is smaller than the inner diameter of the first inlet pipe 41 and the throat section 42.

[0031] Combining 1 and Figure 2 As shown, the first inlet pipe 41 and the outlet pipe 43 of the Venturi tube structure 4 are symmetrically arranged about the middle throat section 42. The first inlet pipe 41 is connected to the second oil supply pipe 22 of the main oil tank 2, and the outlet pipe 43 is connected to the oil supply port of the engine 3. The second inlet pipe 44 is connected to the first oil supply pipe 13 of the auxiliary oil tank 1. The diameters of the first inlet pipe 41 and the outlet pipe 43 are both larger than the diameter of the second inlet pipe 44. More oil flows from the first inlet pipe 41 to the outlet pipe 43, while less oil flows from the second inlet pipe 44 to the outlet pipe 43. This is equivalent to setting the flow ratio by designing the diameters of the first inlet pipe 41 and the second inlet pipe 44, thereby realizing the delivery of oil from the auxiliary oil tank 1 and the main oil tank 2 to the oil inlet of the engine 3 in different proportions.

[0032] Furthermore, when the oil pump 7 is drawing oil, if a small amount of oil is difficult to draw to the engine 3, the venturi tube structure design not only supplies oil in proportion, but also makes the oil pressure at the second inlet pipe 44 greater than the oil pressure at the throat section 42. Through the pressure difference, the oil in the auxiliary oil tank 1 is drawn to the throat section 42 through the second inlet pipe 44, and then flows to the oil inlet of the engine 3 through the outlet pipe 43.

[0033] It should be noted that the inlet needs to overcome system resistance to provide power, and the pressure is usually high. The first inlet pipe 41 and the second inlet pipe 44 are both inlets, but the difference in pipe diameter leads to pressure differentiation. For example, the larger the pipe diameter, the smaller the local resistance and the higher the pressure. At this time, the pressure of the first inlet pipe 41 is the highest. Although the second inlet pipe 44 is an inlet, its pipe diameter is the smallest, and the fluid velocity increases, resulting in a decrease in static pressure. The throat section 42 has a wider pipe diameter, forming a buffer zone, which slows down the flow velocity and the static pressure is lower than the pressure at the first inlet pipe 41 and the second inlet pipe 44. The outlet pipe 43 serves as the outlet, allowing the oil to be discharged. In other words, by setting the diameters of the first inlet pipe 41, the second inlet pipe 44, and the throat section 42, a pressure difference can be formed, which can more smoothly draw the oil in the auxiliary oil tank 1 into the throat section 42.

[0034] In some embodiments, the second inlet pipe 44 is located at the exact center of the throat section 42 along the axial direction. That is, after the second inlet pipe 44 is connected to the first oil supply pipe 13, the thinner pipe in the Venturi structure 4 is drawn to the throat section 42 due to the pressure difference, and flows from the throat section 42 to the outlet pipe 43. By setting the second inlet pipe 44 at the middle position of the throat section 42 along the axial direction, the pressure in the throat section 42 of the Venturi structure 4 is relatively low. Setting the second inlet pipe 44 at this position allows the pressure difference to be utilized to make the liquid intake smoother. Liquid entering from the exact center position allows the oil flowing into the second inlet pipe 44 along the first oil supply pipe 13 to be mixed more evenly with the oil entering from the first inlet pipe 41. Moreover, allowing the oil in the auxiliary oil tank 1 to enter from the exact center of the throat section 42 along the axial direction has less interference with the original flow in the Venturi structure 4 and has less impact on the relatively stable flow velocity distribution and flow state already formed in the Venturi structure 4.

[0035] In some embodiments, the main oil tank 2 is provided with a first liquid level sensor 21, and the auxiliary oil tank 1 is provided with a second liquid level sensor 12.

[0036] Specifically, the oil level in the main oil tank 2 is monitored in real time by the first level sensor 21 in the main oil tank 2, and the oil level in the auxiliary oil tank 1 is monitored by the second level sensor 12 in the auxiliary oil tank 1. This allows the oil supply to the engine 3 to be adjusted according to the actual situation, improving the flexibility of the oil supply and ensuring the normal operation of the engine 3.

[0037] Combination Figure 3As shown, when the first level sensor 21 and the second level sensor 12 detect that both the main oil tank 2 and the auxiliary oil tank 1 have oil, the first oil supply pipe 13 and the second oil supply pipe 22 can be directly controlled to supply oil simultaneously, and the main oil tank 2 can be supplied with oil through the oil supply pump 11 and the fourth oil supply pipe 14, so that the main oil tank 2 and the auxiliary oil tank 1 can supply oil to the engine 3 simultaneously in proportion. When the first level sensor 21 detects that there is oil in the main fuel tank 2, and the second level sensor 12 detects that the oil level in the auxiliary fuel tank 1 is low and the flow rate is abnormal, the first fuel supply pipe 13 of the auxiliary fuel tank 1 is closed, and the second fuel supply pipe 22 of the main fuel tank 2 ensures that the main fuel tank 2 supplies fuel to the engine 3 through the Venturi tube structure 4. The return fuel from the engine 3 eventually flows back to the auxiliary fuel tank 1. After the return fuel, it only takes a few seconds for the fuel to reach the level that the first fuel supply pipe 13 can draw in, at which point the engine 3 can be started. When the fuel in the main fuel tank 2 and the auxiliary fuel tank 1 reaches a certain proportional volume, the first fuel supply pipe 13 of the auxiliary fuel tank 1 is opened. Combined with the design of the Venturi tube structure 4, this ensures that the main fuel tank 2 and the auxiliary fuel tank 1 can continue to supply fuel proportionally, ultimately ensuring that the fuel in the main fuel tank 2 and the auxiliary fuel tank 1 is exhausted.

[0038] When the first level sensor 21 detects a low fuel level and abnormal flow in the main fuel tank 2, and the second level sensor 12 detects fuel in the auxiliary fuel tank 1, the fuel supply pump 11 of the auxiliary fuel tank 1 can supply fuel to the main fuel tank 2. Within seconds, the fuel level in the main fuel tank 2 will reach the level where the second fuel supply pipe 22 can draw fuel, at which point the engine 3 can be started. The fuel supply pump 11 continues to operate at a high flow rate. When the main fuel tank 2 and the auxiliary fuel tank 1 reach a certain proportional volume, the flow rate of the fuel supply pump 11 and the flow rate of the engine 3's suction pump 7 are adjusted. Combined with the design of the Venturi tube structure 4, this ensures that the main fuel tank 2 and the auxiliary fuel tank 1 continue to receive fuel proportionally, ultimately ensuring that the fuel in both tanks is exhausted. When the first level sensor 21 in the main fuel tank 2 detects that the main fuel tank 2 is empty and the second level sensor 12 in the auxiliary fuel tank 1 detects that the auxiliary fuel tank 1 is empty, a refueling prompt is issued.

[0039] Therefore, by setting the first liquid level sensor 21 and the second liquid level sensor 12, the oil level in the main oil tank 2 and the auxiliary oil tank 1 can be monitored in real time, and the switching can be performed according to the actual situation. After the switching is completed, the engine 3 is started to run, so as to achieve simultaneous oil supply to the main oil tank 2 and the auxiliary oil tank 1.

[0040] In some embodiments, a control valve 5 is provided between the auxiliary oil tank 1 and the venturi tube structure 4. The control valve 5 controls the oil in the auxiliary oil tank 1 to enter the venturi tube structure 4. The control valve 5 is a normally open valve, which is suitable for opening the first oil supply pipe 13 when the power is off and closing the first oil supply pipe 13 when the power is on.

[0041] In other words, a control valve 5 is installed at the first fuel supply pipe 13. The control valve 5 can be a solenoid valve. The opening or closing of the control valve 5 is selected based on the fuel level detected by the aforementioned first liquid level sensor 21. For example, when the fuel level in the auxiliary fuel tank 1 is low and the flow rate is abnormal, the first fuel supply pipe 13 is closed by controlling the opening of the solenoid valve, that is, the solenoid valve is energized to supply fuel through the main fuel tank 2. When the fuel in the main fuel tank 2 and the auxiliary fuel tank 1 reaches a certain proportional volume, the solenoid valve is closed, that is, the solenoid valve is de-energized, and the first fuel supply pipe 13 is opened, thereby ensuring that the main fuel tank 2 and the auxiliary fuel tank 1 continue to supply fuel proportionally, and finally ensuring that the fuel in the main fuel tank 2 and the auxiliary fuel tank 1 is exhausted to achieve the maximum range of the vehicle.

[0042] In addition, by setting the solenoid valve as a normally open valve, when it is necessary to maintain the flow of oil for a long time, the normally open valve opens when the power is off, which can ensure that the system can still maintain basic functions when there is no external power. The normally open valve is only energized when it is necessary to close the first oil supply line 13, which significantly reduces energy consumption compared to the normally closed valve which needs to be continuously energized to keep open.

[0043] In some embodiments, the outlet of the venturi tube structure 4 is connected to the oil inlet of the engine 3 via a third oil supply pipe 40, which is equipped with a pressure sensor 6.

[0044] Specifically, the first fuel supply pipe 13 and the second fuel supply pipe 22 flow to the third fuel supply pipe 40 after the flow rate is regulated by the Venturi tube structure 4. The oil in the second fuel supply pipe 22 can flow to the oil inlet of the engine 3. The third fuel supply pipe 40 is equipped with a pressure sensor 6 to prevent the solenoid valve and fuel supply pump 11 from being accidentally activated, causing the fuel tank to overflow beyond the rated flow rate. If at least one of the first level sensor 21 and the second level sensor 12 is abnormal, such as when the fuel tank is full but the sensor shows that the fuel tank is empty, the fuel supply pump 11 or the solenoid valve may be accidentally opened. Therefore, the pressure sensor 6 is set up so that when the data of at least one of the first level sensor 21 and the second level sensor 12 and the pressure sensor 6 are all abnormal, the fuel supply pump 11 or the solenoid valve is activated. That is, the fuel status in the main fuel tank 2 and the auxiliary fuel tank 1 is judged by dual indicators, which improves the accuracy of the judgment.

[0045] In some embodiments, a pressure balance pipe 8 is connected between the upper parts of the auxiliary oil tank 1 and the main oil tank 2, and the top of the pressure balance pipe 8 is higher than the top of the auxiliary oil tank 1 and the main oil tank 2.

[0046] The pressure balancing pipe 8 maintains a balanced oil pressure in the main oil tank 2 and the auxiliary oil tank 1. When the temperature rises, the air inside the tank expands, increasing the pressure; when the temperature drops, the air contracts, decreasing the pressure. The pressure balancing pipe 8 mitigates pressure fluctuations caused by temperature changes, protecting both the auxiliary and main oil tanks. Furthermore, assuming a pressure difference exists between the main and auxiliary oil tanks, fuel might flow unilaterally from the higher-pressure tank to the lower-pressure tank, causing a problem with the fuel supply ratio. The pressure balancing pipe 8 balances the air pressure, maintaining a stable fuel supply to the engine 3 under the aforementioned conditions. In other words, the pressure balancing pipe 8 balances the internal and external air pressure of the main and auxiliary oil tanks 2 and 1, preventing tank deformation, fuel supply interruption, or fuel leakage due to pressure differences.

[0047] The pressure balance pipe 8 may include a main pressure pipe 81 and a manifold 82. The main pressure pipe 81 connects the main fuel tank 2 and the auxiliary fuel tank 1. The connection point of the main pressure pipe 81 to the main fuel tank 2 is located at the top of the main fuel tank 2, and the connection point to the auxiliary fuel tank 1 is located at the top of the auxiliary fuel tank 1. This facilitates the flow of low-density gas within the main fuel tank 2 and the auxiliary fuel tank 1. The manifold 82 is connected to the main pressure pipe 81 at the middle position between the main fuel tank 2 and the auxiliary fuel tank 1, and it is connected to the outside, allowing for a more uniform and stable gas flow. At the same time, the top of the manifold 82 is set high, above the top of the auxiliary fuel tank 1 and the main fuel tank 2, and above the preset wading depth. This prevents water from entering the main fuel tank 2 or the auxiliary fuel tank 1 along the pressure balance pipe 8, which could affect combustion efficiency or cause damage to the engine 3.

[0048] In some embodiments, the engine fuel supply system 100 further includes a fuel filler pipe 9, which includes a common filler pipe 91, and a first branch 92 and a second branch 93 connected to the common filler pipe 91. The first branch 92 is connected to the auxiliary fuel tank 1 and the second branch 93 is connected to the main fuel tank 2.

[0049] Specifically, the common filling pipe 91 of the refueling pipe 9 is selectively connected to the first branch 92 and the second branch 93. In practice, a switching valve can be selected to switch between them, allowing selective refueling of the main fuel tank 2 or the auxiliary fuel tank 1 from the refueling pipe 9. If the auxiliary fuel tank 1 needs refueling, the connection between the common filling pipe 91 and the second branch 93 is disconnected, and the common filling pipe 91 is connected to the first branch 92. Refueling is then carried out through the common filling pipe 91 along the first branch 92, thus achieving the goal of adding oil from the first branch 92. The fuel enters the auxiliary fuel tank 1. When it is necessary to refuel the main fuel tank 2, the common refueling pipe 91 is switched off from the first branch 92 and connected to the second branch 93. This allows the main fuel tank 2 to be refueled from the common refueling pipe 91 along the second branch 93. The fuel is supplied to the main fuel tank 2 and the auxiliary fuel tank 1 according to the volume of the main fuel tank 2 and the auxiliary fuel tank 1 and the required fuel supply ratio. The fuel is supplied through the common refueling pipe 91, which has a high degree of integration, reduces pipeline waste, and facilitates refueling.

[0050] In some embodiments, the engine fuel supply system 100 further includes a first return pipe 10 and a second return pipe 20. One end of the first return pipe 10 is connected to the auxiliary fuel tank 1 and the other end is connected to the common filling pipe 91. One end of the second return pipe 20 is connected to the main fuel tank 2 and the other end is connected to the common filling pipe 91.

[0051] In practice, when fuel is rapidly injected into the main fuel tank 2 or the auxiliary fuel tank 1, the air inside is compressed, and the pressure rises rapidly. If the air pressure in the main fuel tank 2 or the auxiliary fuel tank 1 cannot be released in time, positive pressure will form. When the pressure exceeds the set value of the pressure valve inside the fuel nozzle, the pressure valve will automatically close, causing the nozzle to shut off. Therefore, the first air return pipe 10 and the second air return pipe 20 are installed to expel the compressed air in the main fuel tank 2 and the auxiliary fuel tank 1 during refueling, preventing pressure buildup and allowing fuel to be added smoothly. When fuel is consumed, outside air is allowed to enter the fuel tank to balance the negative pressure and prevent the fuel tank from deforming.

[0052] This utility model embodiment also discloses a vehicle, including the above-mentioned engine fuel supply system 100. The second fuel supply pipe 22 of the main fuel tank 2 and the first fuel supply pipe 13 of the auxiliary fuel tank 1 are connected by a venturi tube structure 4. The negative pressure of the suction pump 7 is used to supply fuel to the engine 3. The fuel flows back to the auxiliary fuel tank 1 through the engine 3. The auxiliary fuel tank 1 integrates a fuel supply pump 11 to supply fuel to the main fuel tank 2, ensuring the operation of the dual fuel tank system, improving the reliability of the dual fuel tank system, and reducing costs.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An engine fuel supply system (100), characterized in that, include: Auxiliary oil tank (1), the auxiliary oil tank (1) is connected to a first oil supply pipe (13), and an oil supply pump (11) is provided in the auxiliary oil tank (1). The main oil tank (2) is connected to a second oil supply pipe (22), and the oil supply pump (11) in the auxiliary oil tank (1) is adapted to pump oil into the main oil tank (2). The Venturi tube structure (4) includes two inlets and one outlet. The two inlets of the Venturi tube structure (4) are respectively connected to the first oil supply pipe (13) and the second oil supply pipe (22), and one outlet of the Venturi tube structure (4) is connected to the oil inlet of the engine (3) through the oil suction pump (7). The oil return port of the engine (3) is connected to the auxiliary oil tank (1).

2. The engine fuel supply system (100) according to claim 1, characterized in that, The Venturi tube structure (4) includes a first inlet tube (41), a throat section (42), an outlet tube (43), and a second inlet tube (44) connected sequentially along the axial direction. The diameter of the first inlet pipe (41) gradually decreases at the end facing the throat section (42), and the diameter of the throat section (42) gradually increases at the end facing the outlet pipe (43). The first inlet pipe (41) is connected to the second oil supply pipe (22), and the outlet pipe (43) is connected to the oil inlet of the engine (3). One end of the second inlet pipe (44) is connected to the throat section (42), and the other end is connected to the first oil supply pipe (13). The inner diameter of the second inlet pipe (44) is smaller than that of the first inlet pipe (41) and the throat section (42).

3. The engine fuel supply system (100) according to claim 2, characterized in that, The second inlet pipe (44) is located at the center of the throat section (42) along the axial direction.

4. The engine fuel supply system (100) according to claim 1, characterized in that, The main oil tank (2) is equipped with a first liquid level sensor (21), and the auxiliary oil tank (1) is equipped with a second liquid level sensor (12).

5. The engine fuel supply system (100) according to claim 1, characterized in that, A control valve (5) is provided between the auxiliary oil tank (1) and the venturi tube structure (4). The control valve (5) controls the oil in the auxiliary oil tank (1) to enter the venturi tube structure (4). The control valve (5) is a normally open valve, which is suitable for opening the first oil supply pipe (13) when the power is off and closing the first oil supply pipe (13) when the power is on.

6. The engine fuel supply system (100) according to claim 1, characterized in that, The outlet of the Venturi tube structure (4) is connected to the oil inlet of the engine (3) through the third oil supply pipe (40), and the third oil supply pipe (40) is equipped with a pressure sensor (6).

7. The engine fuel supply system (100) according to claim 1, characterized in that, A pressure balance pipe (8) is connected between the upper parts of the auxiliary oil tank (1) and the main oil tank (2), and the top of the pressure balance pipe (8) is higher than the top of the auxiliary oil tank (1) and the main oil tank (2).

8. The engine fuel supply system (100) according to claim 1, characterized in that, It also includes a refueling pipe (9), which includes a common refueling pipe (91), and a first branch (92) and a second branch (93) connecting the common refueling pipe (91), the first branch (92) connecting the auxiliary fuel tank (1) and the second branch (93) connecting the main fuel tank (2).

9. The engine fuel supply system (100) according to claim 8, characterized in that, It also includes a first return air pipe (10) and a second return air pipe (20), one end of the first return air pipe (10) is connected to the auxiliary oil tank (1) and the other end is connected to the common filling pipe (91), and one end of the second return air pipe (20) is connected to the main oil tank (2) and the other end is connected to the common filling pipe (91).

10. A vehicle, characterized in that, Includes the engine fuel supply system (100) as described in any one of claims 1-9.

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