Control method of fuel supply system

Abstract

The present invention belongs to the field of automotive technology and discloses a method for controlling a fuel supply system, including: determining engine start; obtaining an ambient temperature Te, a liquid level La in a main fuel tank, and a liquid level Lb in a secondary fuel tank; S300, comparing Lb with a first set liquid level Lb1, comparing La with a second set liquid level La1, and comparing Te with a preset temperature Te1; ​​if Lb is greater than or equal to Lb1, La is less than La1, and Te is less than Te1, placing a degassing switching mechanism in a second state; after a set time t1, placing the degassing switching mechanism in a third state, and after a set time t2, returning to S300; if Lb is less than Lb1, or when Lb is greater than or equal to Lb1 and La is greater than or equal to La1, placing the degassing switching mechanism in the first state. This arrangement can ensure unobstructed passage between the two fuel tanks in a dual fuel supply system in cold regions, ensuring normal vehicle operation.

Description

Technical Field

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

[0002] Diesel commercial vehicles are generally equipped with larger fuel tanks due to their long mileage and high efficiency. Due to vehicle layout constraints, the tank capacity cannot be increased indefinitely, leading to the development of dual-tank fuel supply systems. A dual-tank fuel supply system consists of a main and auxiliary fuel supply mechanism. The auxiliary fuel supply mechanism replenishes fuel to the main fuel supply mechanism, which then supplies fuel to the engine.

[0003] Prior art (Chinese Patent CN115257363A) provides a dual-tank fuel supply system in which a fuel outlet pipe connects the main and auxiliary tanks, through which the auxiliary tank supplies fuel to the main tank. However, in cold climates, fuel crystallization can easily occur, clogging the outlet pipe and preventing the auxiliary tank from supplying fuel to the main tank, making it difficult for the driver to start the vehicle.

[0004] Therefore, a control method for a fuel supply system is urgently needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a control method for a fuel supply system, which can ensure the smooth flow of fuel between the two fuel tanks in a dual fuel supply system, ensuring that the vehicle can still carry out normal circulation of fuel between the dual fuel tanks and normal driving of the vehicle in cold areas.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A method for controlling a fuel supply system is provided for controlling heating of the fuel supply system. The fuel supply system includes a main fuel supply mechanism, a secondary fuel supply mechanism, and a degassing switching mechanism. The main fuel supply mechanism includes a diesel filter and interconnected large and small fuel tanks. The small fuel tank integrates an additional fuel supply pump and several heating pipes, and the small fuel tank is connected to the engine via the diesel filter. The secondary fuel supply mechanism includes a secondary fuel tank provided with a fuel delivery pipe. The degassing switching mechanism is connected between the large fuel tank, the diesel filter, and the secondary fuel tank. The degassing switching mechanism has three operating states:

[0008] In the first state, the diesel filter and the large fuel tank are connected;

[0009] In the second state, the auxiliary fuel tank and the diesel filter are connected;

[0010] In the third state, the auxiliary fuel tank is connected to the large fuel tank and the degassing switching mechanism is connected;

[0011] The control method of the fuel supply system includes:

[0012] S100, determining that the engine is started;

[0013] S200, obtaining the ambient temperature Te, the liquid level La of the main fuel tank, and the liquid level Lb of the auxiliary fuel tank;

[0014] S300, comparing the liquid level Lb of the auxiliary tank with the first set liquid level Lb1, comparing the liquid level La of the large tank with the second set liquid level La1, and comparing the ambient temperature Te with the preset temperature Te1;

[0015] S400. In S300, if the liquid level Lb of the auxiliary tank is greater than or equal to the first set liquid level Lb1, and the liquid level La of the large tank is less than the second set liquid level La1, and the ambient temperature Te is less than the preset temperature Te1, the degassing switching mechanism is placed in the second state;

[0016] S500, after a set time t1 in S400, the degassing switching mechanism is placed in the third state, and after a set time t2, the process returns to S300;

[0017] S600. In S300, if the liquid level Lb of the auxiliary tank is greater than or equal to the first set liquid level Lb1, and the liquid level La of the large tank is less than the second set liquid level La1, and the ambient temperature Te is greater than or equal to the preset temperature Te1, the degassing switching mechanism is placed in the third state, and after a set time t2, the process returns to S300.

[0018] S600. In S300, if the liquid level Lb of the auxiliary tank is less than the first set liquid level Lb1, or when the liquid level Lb of the auxiliary tank is greater than or equal to the first set liquid level Lb1 and the liquid level La of the large tank is greater than or equal to the second set liquid level La1, the degassing switching mechanism is placed in the first state.

[0019] As a preferred embodiment of the method for controlling the fuel supply system provided by the present invention, the method for controlling the fuel supply system further includes the following steps at S100:

[0020] S001, obtaining an ambient temperature Te and determining that the ambient temperature Te is less than a first set temperature T1;

[0021] S002, obtaining the fuel temperature Tf in the small fuel tank, and determining that the fuel temperature Tf in the small fuel tank is less than a first set temperature T1;

[0022] S003: The heating pipe is energized to electrically heat the fuel in the small fuel tank;

[0023] S004: After a first set time Tj1, the first fuel supply pump in the small fuel tank is powered on;

[0024] S005: Starting the engine after a second set time Tb2.

[0025] As a preferred embodiment of the method for controlling the fuel supply system provided by the present invention, the method for controlling the fuel supply system further includes the following steps after S100:

[0026] S006: After a third set time Tb3, the additional oil supply pump is powered off;

[0027] S007: Obtaining the temperature of the engine's cooling water, and determining whether the temperature of the engine's cooling water is greater than or equal to a set water temperature limit Tw;

[0028] S008: When the temperature of the cooling water of the engine is greater than or equal to the set water temperature limit Tw, the heating pipe is powered off.

[0029] As a preferred embodiment of the control method of the fuel supply system provided by the present invention, S002 further includes, after obtaining the fuel temperature Tf in the small fuel tank and before determining that the fuel temperature Tf in the small fuel tank is less than the first set temperature T1:

[0030] Determining whether the temperature sensor is faulty includes determining whether the difference between the fuel temperature Tf in the small fuel tank and the ambient temperature Te is not greater than the set oil temperature limit Ts. If the difference between the fuel temperature Tf in the small fuel tank and the ambient temperature Te is not greater than the set oil temperature limit Ts, determining that the temperature sensor is faulty.

[0031] As a preferred solution of the control method of the fuel supply system provided by the present invention, judging that the temperature sensor is not faulty in S002 also includes: if the difference between the fuel temperature Tf in the small fuel tank and the ambient temperature Te is greater than the set oil temperature limit Ts, it is determined that the temperature sensor is faulty, and the fuel temperature Tf in the small fuel tank is redefined to be equal to the difference between the ambient temperature Te and the manually preset temperature.

[0032] As a preferred solution of the control method of the fuel supply system provided by the present invention, in S001, if the ambient temperature Te is greater than the first set temperature T1, the engine is directly started.

[0033] As a preferred embodiment of the control method of the fuel supply system provided by the present invention, in S003, when the fuel temperature Tf in the small fuel tank is between the second set temperature T2 and the first set temperature T1, wherein the second set temperature T2 is lower than the first set temperature T1, the first set time = T11, the second set time = T21, and the third set time = T31;

[0034] If the fuel temperature Tf in the small fuel tank is lower than the second set temperature T2, the first set time = T12, the second set time = T22, the third set time = T33, T12>T11, T22>T21, T32>T31.

[0035] As a preferred embodiment of the control method of the fuel supply system provided by the present invention, in S007, if the temperature of the cooling water of the engine is lower than the set water temperature limit Tw, then S009 is executed;

[0036] S009: Obtaining the power-on time of the heating tube, the engine speed n, and the vehicle speed V;

[0037] If the power-on time of the heating tube is greater than or equal to the set working time Th, the engine speed n is not 0, and the vehicle speed V is not 0, the process returns to S007.

[0038] As a preferred solution of the control method of the fuel supply system provided by the present invention, in S009, if the power-on time of the heating pipe is greater than or equal to the set working time Th and the speed n of the engine is 0, the fuel supply system is powered off.

[0039] As a preferred solution of the control method of the fuel supply system provided by the present invention, the plurality of heating tubes are arranged at intervals. In S009, if the power-on time of the heating tubes is greater than or equal to the set working time Th, the engine speed n is not 0 and the vehicle speed V is 0, some of the heating tubes are powered off, while the other part of the heating tubes continue to be powered on, and the process returns to S007.

[0040] Beneficial effects of the present invention:

[0041] The fuel supply system control method provided by the present invention uses the ambient temperature Te, the liquid level La of the main fuel tank, and the liquid level Lb of the auxiliary fuel tank as the basis for judgment logic. When the liquid level Lb of the auxiliary fuel tank is greater than or equal to a first set level Lb1, the liquid level La of the main fuel tank is less than a second set level La1, and the ambient temperature Te is less than a preset temperature Te1, it indicates that the fuel in the auxiliary fuel tank needs to be pumped into the main fuel tank. However, the temperature is too low at this time, and solid fuel may be present in the oil pipeline between the main and auxiliary fuel tanks, affecting the success rate of fuel pumping. At this time, the degassing switching mechanism is in the second state, that is, the auxiliary fuel tank and the diesel filter are connected. Fuel in the diesel filter can enter the oil pipeline through the degassing switching mechanism, opening the oil pipeline and preparing for the subsequent pumping of fuel from the auxiliary fuel tank to the main fuel tank. After a set time t1, the fuel line is opened, allowing fuel to be pumped from the auxiliary tank to the main tank. The degassing switching mechanism enters its third state, connecting the auxiliary tank and the main tank, allowing fuel to be pumped from the auxiliary tank to the main tank. The diesel filter is now connected to the degassing switching mechanism, allowing the degassing process to proceed. When the auxiliary tank's liquid level Lb is greater than or equal to a first set level Lb1, and the main tank's liquid level La is less than a second set level La1, and the ambient temperature Te is greater than or equal to a preset temperature Te1, the degassing switching mechanism also enters its third state. This indicates that the main tank is running low on fuel, that the auxiliary tank has sufficient fuel to supply it, and that the ambient temperature has risen to a level at which fuel can melt. The fuel line is now open, allowing fuel to be pumped from the auxiliary tank to the main tank. At time t2, when the degassing switching mechanism is in the third state, the logic returns to S300. When the auxiliary tank's liquid level Lb is less than the first set level Lb1, or when the auxiliary tank's liquid level Lb is greater than or equal to the first set level Lb1 and the main tank's liquid level La is greater than or equal to the second set level La1, the degassing switching mechanism is in the first state. In this case, the auxiliary tank's fuel level is insufficient to pump fuel into the main tank, and the main tank's fuel level is sufficient, eliminating the need for pumping. Only the degassing process of the diesel filter is performed. This fuel supply system control method ensures unobstructed access between the two tanks in a dual fuel supply system, ensuring normal fuel flow and vehicle operation even in cold climates. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0043] Figure 1 is a schematic diagram of a fuel supply system provided by an embodiment of the present invention;

[0044] Figure 2 1 is a schematic structural diagram of a degassing switching mechanism provided by an embodiment of the present invention;

[0045] Figure 3 is an exploded view of a degassing switching mechanism provided by an embodiment of the present invention;

[0046] Figure 4 This is a flow chart of a fuel supply control process in a fuel supply system control method provided by an embodiment of the present invention;

[0047] Figure 5 It is a flow chart of the combustion control process in the control method of the fuel supply system provided by an embodiment of the present invention.

[0048] In the picture:

[0049] 100. Engine;

[0050] 1. Degassing switching mechanism; 11. Valve body; 111. Inner cylinder; 112. Outer cylinder; 12. Valve core; 13. Degassing pump;

[0051] 2. Large fuel tank;

[0052] 3. Small fuel tank; 31. Heating pipe; 32. Additional fuel supply pump; 33. Degassing pump;

[0053] 4. Wood filter;

[0054] 5. Auxiliary fuel tank; 51. Oil pipeline. DETAILED DESCRIPTION

[0055] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0056] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0059] The following describes an embodiment of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0060] Reference Figure 1 This embodiment provides a fuel supply system. The main fuel supply mechanism includes a diesel filter 4 and interconnected large and small fuel tanks 2 and 3. The small fuel tank 3 integrates an additional fuel pump 32 and several heating pipes 31. The small fuel tank 3 is connected to the engine 100 through the diesel filter 4. The auxiliary fuel supply mechanism includes an auxiliary fuel tank 5, which is provided with a fuel delivery pipe 51. The degassing switching mechanism 1 is connected between the large fuel tank 2, the diesel filter 4, and the auxiliary fuel tank 5.

[0061] Specifically, several heating tubes 31 within the interior of the small fuel tank 3 electrically heat the fuel. Due to the small size of the small fuel tank 3, the fuel temperature rises rapidly and efficiently. Both the large and small fuel tanks 2 and 3 are filled with No. 0 diesel fuel. When the vehicle is traveling in cold weather, before starting the engine 100, the heating tubes 31 rapidly heat the fuel in the small fuel tank 3 until it melts. The heated No. 0 diesel fuel then flows through the fuel supply line to the engine 100, providing fuel for the engine 100. After the engine 100 has operated for a certain period of time, the residual heat generated by the engine 100 heats the cooling water in the water tank. This cooling water then flows through the water inlet line to the large fuel tank 2, heating and thawing the No. 0 diesel fuel in the large tank 2 until the fuel is completely melted. The melted No. 0 diesel fuel then enters the small fuel tank 3 through the oil outlet, connecting pipe, and oil inlet, where it continuously supplies fuel to the engine 100. No. 0 diesel is relatively cheap, but it is prone to crystallization in cold environments. Through the above settings, vehicles can use cheaper diesel in cold areas, which is beneficial to reducing economic costs.

[0062] More specifically, the additional fuel supply pump 32 is integrated with the small fuel tank 3. The small fuel tank 3 itself has an integrated first fuel supply pump. This first fuel supply pump is capable of pumping the fuel in the small fuel tank 3 to the engine 100 under normal circumstances. The additional fuel supply pump 3 has a higher pumping pressure than the first fuel supply pump. When the fuel in the small fuel tank 3 is in a solid-liquid coexisting state, the additional fuel supply pump 32 pumps the fuel in the small fuel tank 3 to the engine 100. When the heating pipe 31 heats the fuel in the small fuel tank 3 until the fuel is completely melted, the additional fuel supply pump 32 stops operating.

[0063] Preferably, the fuel supply system also includes a degassing pump 33, which is used to increase the fuel level. Degassing pump 33 is integrated into the small fuel tank 3, resulting in a compact structure and efficient use of installation space. Degassing pump 33 increases the fuel level within the small fuel tank 3, thereby ensuring timely fuel supply to the engine 100.

[0064] More specifically, a number of heating tubes 31 are arranged at intervals and are all immersed in the fuel in the small fuel tank 3. The multiple heating tubes 31 are all powered and electrically heat the fuel in the small fuel tank 3 at the same time. Specifically, one end of the heating tube 31 is set on the outer shell of the small fuel tank 3, and the power supply voltage is directly applied to the heating tube 31. When current flows through, the heating tube 31 generates heat, and the other end is completely immersed in the fuel. There are multiple heating tubes 31, which effectively shortens the heating time of the fuel temperature and improves the heating efficiency. Before the engine 100 is started, the multiple heating tubes 31 electrically heat the fuel by converting electrical energy into thermal energy, so that the fuel in the small fuel tank 3 and the fuel in the low-pressure pipeline melt.

[0065] Optionally, the fuel supply system also includes a one-way valve installed in the connecting pipe. This one-way valve is a one-way ball valve, the diameter of which can be selected based on the diameter of the connecting pipe. The maximum operating pressure of the one-way valve is 0.6 MPa. Located at the end of the connecting pipe near the fuel inlet of the small fuel tank 3, the one-way valve ensures that fuel can only flow from the large fuel tank 2 to the small fuel tank 3 in one direction, preventing fuel backflow.

[0066] Reference Figure 2 and Figure 3 The switching mechanism 1 includes a valve body 11, a valve core 12, and a degassing pump 13. The valve body 11 includes an inner cylinder 111 and an outer cylinder 112 coaxially arranged, with the inner cylinder 111 containing a valve cavity. The degassing pump 13 is integrated into the valve body 11 and is configured to remove gas from the valve cavity. The valve core 12 is rotatably inserted between the inner cylinder 111 and the outer cylinder 112. The rotation of the valve core 12 enables the switching mechanism 1 to have at least three states:

[0067] In the first state, the diesel filter 4 is connected to the large fuel tank 2;

[0068] In the second state, the auxiliary fuel tank 5 is connected to the diesel filter 4;

[0069] In the third state, the auxiliary fuel tank 5 is connected to the large fuel tank 2 and the diesel filter 4 .

[0070] Specifically, the valve body 11 is provided with a first through hole, a second through hole, a third through hole and a fourth through hole which pass through the side wall of the inner tube 111 and the side wall of the outer tube 112. The first through hole and the second through hole are respectively connected to the large oil tank 2, the third through hole is connected to the oil pipe 51, and the fourth through hole is connected to the oil pipe 51.

[0071] More specifically, the first, second, and third through-holes are spaced apart along the circumference of the valve body 11, and the fourth through-hole is spaced apart from the third through-hole along the axial direction of the valve body 11. A manifold is integrated into the circumferential side of the outer cylinder 112, into which the third and fourth through-holes engage. This manifold contains a manifold cavity that connects to the oil pipeline 51. The valve core 12 is also formed with a first, second, and third central hole on its circumferential side.

[0072] More specifically, a bottom through-hole is defined at the bottom of the inner cylinder 111, and a first through-hole, a second through-hole, and a third through-hole are defined at one end of the valve core 12 away from the degassing pump 13, each of which is connected to the bottom through-hole. The first through-hole, the second through-hole, and the third through-hole are all connected to the diesel filter 4.

[0073] When the valve core 12 rotates until the switching mechanism 1 is in the first state, the first through hole is connected to the first middle hole, and the valve cavity is connected to the large fuel tank 2; the first through hole is connected to the bottom through hole, and the fuel and gas inside the diesel filter 4 can enter the valve cavity through the first through hole and the bottom through hole, and the gas can be introduced into the large fuel tank 2, thereby realizing the degassing process of the internal space of the diesel filter 4.

[0074] When valve core 12 rotates until switching mechanism 1 is in the second state, the third through-hole connects to the second middle hole, and the valve chamber connects to the manifold and oil delivery pipe 51 in sequence. The second through-hole connects to the bottom through-hole, allowing fuel supplied from small fuel tank 3 to enter the valve chamber through the second through-hole and the bottom through-hole. The fuel then flows through the third through-hole and the second middle hole into the manifold, ultimately flowing into oil delivery pipe 51. This opens up oil delivery pipe 51, preparing for the transfer of fuel from auxiliary fuel tank 5 to main fuel tank 2.

[0075] When the valve core 12 rotates until the switching mechanism 1 is in the third state, the second through-hole connects to the first center hole, connecting the valve chamber to the main fuel tank 2. The fourth through-hole connects to the third center hole, connecting the valve chamber to the manifold, fuel pipe 51, and auxiliary fuel tank 5 in sequence. The third through-hole connects to the bottom through-hole. It should be noted that the diameter of this third through-hole is significantly smaller than that of the bottom through-hole. Therefore, fuel inside the diesel filter 4 cannot flow into the valve chamber through the third through-hole. Only gas from the gas collection chamber at the top of the diesel filter 4 enters the valve chamber through the third through-hole and the bottom through-hole, where it is removed by the degassing pump 13. Fuel in the auxiliary fuel tank 5 flows through the fuel pipe 51, the manifold, and the valve chamber to the main fuel tank 2. The auxiliary fuel tank 5 can now pump fuel into the main fuel tank 2, and the degassing pump 13 simultaneously degasses the fuel flowing from the auxiliary fuel tank 5 to the main fuel tank 2.

[0076] This embodiment also provides a fuel supply system control method, which is used to control the fuel supply system. The fuel supply system control method includes a combustion control process performed before and after the engine 100 is started, and a fuel supply control process after the engine 100 is started.

[0077] Reference Figure 4 , the combustion control process specifically includes the following steps:

[0078] The control method of the fuel supply system further includes the following steps before the engine 100 is started:

[0079] S001. Obtain the ambient temperature Te and determine that the ambient temperature Te is less than the first set temperature T1. Then proceed to S002.

[0080] Furthermore, in S001 , if the ambient temperature Te is greater than the first set temperature T1 , the engine 100 is directly started.

[0081] S002 , obtaining the fuel temperature Tf in the small fuel tank 3 , and determining whether the fuel temperature Tf in the small fuel tank 3 is lower than the first set temperature T1 .

[0082] Specifically, S002 further includes the following steps after obtaining the fuel temperature Tf in the small fuel tank 3 and before determining that the fuel temperature Tf in the small fuel tank 3 is lower than the first set temperature T1:

[0083] Determine whether the temperature sensor is faulty. Determine whether the temperature sensor is faulty, including: determining whether the difference between the fuel temperature Tf in the small fuel tank 3 and the ambient temperature Te is not greater than the set oil temperature limit Ts. If the difference between the fuel temperature Tf in the small fuel tank 3 and the ambient temperature Te is not greater than the set oil temperature limit Ts, then determine that the temperature sensor is faulty.

[0084] More specifically, determining that the temperature sensor is not faulty in S002 further includes determining that the temperature sensor is faulty if the difference between the fuel temperature Tf in the small fuel tank 3 and the ambient temperature Te is greater than the set oil temperature limit Ts, and redefining the fuel temperature Tf in the small fuel tank 3 to be equal to the difference between the ambient temperature Te and a preset temperature. In this embodiment, the preset temperature is 20°C.

[0085] S003: The heating pipe 31 is energized and electrically heats the fuel in the small fuel tank 3 .

[0086] Specifically, in S003, when the fuel temperature Tf in the small fuel tank 3 is between the second set temperature T2 and the first set temperature T1, wherein the second set temperature T2 is lower than the first set temperature T1, the first set time = T11, the second set time = T21, and the third set time = T31;

[0087] If the fuel temperature Tf in the small fuel tank 3 is lower than the second set temperature T2, the first set time = T12, the second set time = T22, the third set time = T33, T12>T11, T22>T21, T32>T31.

[0088] S004: After a first set time Tj1, the first fuel supply pump in the small fuel tank 3 is energized, and the fuel supply process of the engine 100 is carried out normally.

[0089] S005: After a second set time Tb2, the engine 100 is started.

[0090] Furthermore, after the engine 100 is started, the combustion control process further includes the following steps:

[0091] S006: After a third set time Tb3, the additional oil supply pump 32 is powered off;

[0092] S007: Obtaining the temperature of the cooling water of the engine 100 and determining whether the temperature of the cooling water of the engine 100 is greater than or equal to a set water temperature limit value Tw;

[0093] S008: When the temperature of the cooling water of the engine 100 is greater than or equal to the set water temperature limit Tw, the heating pipe 31 is powered off.

[0094] Furthermore, in S007, if the temperature of the cooling water of the engine 100 is lower than the set water temperature limit Tw, S009 is executed;

[0095] S009: Obtaining the power-on time of the heating tube 31, the speed n of the engine 100, and the vehicle speed V;

[0096] If the power-on time of the heating tube 31 is greater than or equal to the set working time Th, the speed n of the engine 100 is not 0 and the vehicle speed V is not 0, the vehicle is in a normal driving state and the process returns to S007.

[0097] Specifically, in S009, if the power-on time of the heating tube 31 is greater than or equal to the set working time Th and the speed n of the engine 100 is 0, the engine 100 may fail and the fuel supply system is powered off.

[0098] To be more specific, multiple heating tubes 31 are arranged at intervals. In S009, if the power-on time of the heating tube 31 is greater than or equal to the set working time Th, the speed n of the engine 100 is not 0 and the vehicle speed V is 0, the vehicle is in an idling state at this time, some of the heating tubes 31 are powered off, and the other part of the heating tubes 31 continue to be powered on, and the process returns to S007.

[0099] Reference Figure 5 , the oil supply control process specifically includes the following steps:

[0100] S100: Determine whether the engine 100 is started.

[0101] S200: Obtain the ambient temperature Te, the liquid level La of the main fuel tank 2, and the liquid level Lb of the auxiliary fuel tank 5. In this embodiment, the main fuel tank 2 and the auxiliary fuel tank 5 are each integrated with a liquid level gauge for measuring the liquid level La of the main fuel tank 2 and the liquid level Lb of the auxiliary fuel tank 5. The ambient temperature Te, the liquid level La of the main fuel tank, and the liquid level Lb of the auxiliary fuel tank are used as the basis for the judgment logic of the following steps.

[0102] S300 , comparing the liquid level Lb of the auxiliary oil tank 5 with the first set liquid level Lb1 , comparing the liquid level La of the large oil tank 2 with the second set liquid level La1 , and comparing the ambient temperature Te with the preset temperature Te1 .

[0103] S400. In S300, if the liquid level Lb of the auxiliary fuel tank 5 is greater than or equal to the first set liquid level Lb1, the liquid level La of the main fuel tank 2 is less than the second set liquid level La1, and the ambient temperature Te is less than the preset temperature Te1, the degassing switching mechanism 1 is placed in the second state. At this point, fuel from the auxiliary fuel tank 5 needs to be pumped into the main fuel tank 2. However, the temperature is too low, and solid fuel may be present in the oil pipeline 51 between the main fuel tank 2 and the auxiliary fuel tank 5, affecting the success rate of pumping. At this point, the degassing switching mechanism switches to the second state, connecting the auxiliary fuel tank 5 and the diesel filter 4. Fuel in the diesel filter 4 can enter the oil pipeline 51 through the degassing switching mechanism 1, thus opening the oil pipeline 51 and preparing for subsequent pumping of fuel from the auxiliary fuel tank 5 to the main fuel tank 2.

[0104] S500 , after a set time t1 in S400 , the degassing switching mechanism 1 is placed in the third state, and after a set time t2 , the process returns to S300 .

[0105] S600. In S300, if the liquid level Lb of the auxiliary fuel tank 5 is greater than or equal to the first set liquid level Lb1, the liquid level La of the main fuel tank 2 is less than the second set liquid level La1, and the ambient temperature Te is greater than or equal to the preset temperature Te1, the degassing switching mechanism 1 is placed in the third state. After a set time t2, the process returns to S300. When the degassing switching mechanism 1 is in the third state, the auxiliary fuel tank 5 and the main fuel tank 2 are connected, allowing the auxiliary fuel tank 5 to pump fuel into the main fuel tank 2. At this time, the diesel filter 4 is connected to the degassing switching mechanism, and the degassing process of the diesel filter 4 is performed through the degassing switching mechanism 1.

[0106] S600. In S300, if the liquid level Lb of the auxiliary fuel tank 5 is less than the first set liquid level Lb1, or if the liquid level Lb of the auxiliary fuel tank 5 is greater than or equal to the first set liquid level Lb1 and the liquid level La of the main fuel tank 2 is greater than or equal to the second set liquid level La1, the degassing switching mechanism 1 is placed in the first state. In these states, the fuel level in the auxiliary fuel tank 5 is insufficient to pump fuel into the main fuel tank 2, and the fuel level in the main fuel tank 2 is sufficient, eliminating the need for pumping fuel. In this state, only the degassing process of the diesel filter 4 is performed.

[0107] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling a fuel supply system, for controlling heating of a fuel supply system, characterized in that: The fuel supply system comprises a main fuel supply mechanism, an auxiliary fuel supply mechanism and a degassing switching mechanism (1); the main fuel supply mechanism comprises a diesel filter (4) and a large fuel tank (2) and a small fuel tank (3) that are interconnected; the small fuel tank (3) is integrated with an additional fuel supply pump (32) and a plurality of heating pipes (31); the small fuel tank (3) is connected to the engine (100) through the diesel filter (4); the auxiliary fuel supply mechanism comprises an auxiliary fuel tank (5), the auxiliary fuel tank (5) is provided with an oil delivery pipe (51); the degassing switching mechanism (1) is connected between the large fuel tank (2), the diesel filter (4) and the auxiliary fuel tank (5); the degassing switching mechanism (1) has three working states: In the first state, the diesel filter (4) and the large fuel tank (2) are connected; In the second state, the auxiliary fuel tank (5) and the diesel filter (4) are connected; In the third state, the auxiliary fuel tank (5) is connected to the large fuel tank (2), and the diesel filter (4) is also connected; The control method of the fuel supply system includes: S100, determining that the engine (100) is started; S200, obtaining the ambient temperature Te, the liquid level La of the large oil tank (2), and the liquid level Lb of the auxiliary oil tank (5); S300, comparing the liquid level Lb of the auxiliary oil tank (5) with the first set liquid level Lb1, comparing the liquid level La of the large oil tank (2) with the second set liquid level La1, and comparing the ambient temperature Te with the preset temperature Te1; S400. In S300, if the liquid level Lb of the auxiliary oil tank (5) is greater than or equal to the first set liquid level Lb1, and the liquid level La of the large oil tank (2) is less than the second set liquid level La1, and the ambient temperature Te is less than the preset temperature Te1, the degassing switching mechanism (1) is placed in the second state; S500, after a set time t1 in S400, the degassing switching mechanism (1) is placed in the third state, and after a set time t2, returns to S300; S600. In S300, if the liquid level Lb of the auxiliary oil tank (5) is greater than or equal to the first set liquid level Lb1, and the liquid level La of the large oil tank (2) is less than the second set liquid level La1, and the ambient temperature Te is greater than or equal to the preset temperature Te1, the degassing switching mechanism (1) is placed in the third state, and after the set time t2, the process returns to S300; S600. In S300, if the liquid level Lb of the auxiliary oil tank (5) is less than the first set liquid level Lb1, or when the liquid level Lb of the auxiliary oil tank (5) is greater than or equal to the first set liquid level Lb1 and the liquid level La of the large oil tank (2) is greater than or equal to the second set liquid level La1, the degassing switching mechanism (1) is placed in the first state.

2. The method for controlling the fuel supply system according to claim 1, wherein: The control method of the fuel supply system further includes the following steps before S100: S001, obtaining an ambient temperature Te and determining that the ambient temperature Te is less than a first set temperature T1; S002, obtaining the fuel temperature Tf in the small fuel tank (3), and determining that the fuel temperature Tf in the small fuel tank (3) is less than a first set temperature T1; S003: The heating pipe (31) is energized to electrically heat the fuel in the small fuel tank (3); S004: After a first set time Tj 1, the first oil supply pump in the small oil tank (3) is powered on; S005: After a second set time Tb2, the engine (100) is started.

3. The method for controlling the fuel supply system according to claim 2, wherein: The control method of the fuel supply system further includes the following steps after S100: S006: After a third set time Tb3, the additional oil supply pump (32) is powered off; S007: obtaining the water temperature of the cooling water of the engine (100), and determining whether the water temperature of the cooling water of the engine (100) is greater than or equal to a set water temperature limit value Tw; S008: When the temperature of the cooling water of the engine (100) is greater than or equal to the set water temperature limit Tw, the heating pipe (31) is powered off.

4. The method for controlling a fuel supply system according to claim 2, wherein: S002 further includes the following steps, which are located after obtaining the fuel temperature Tf in the small fuel tank (3) and before determining that the fuel temperature Tf in the small fuel tank (3) is less than the first set temperature T1: Determining whether the temperature sensor has no faults includes: determining whether the difference between the fuel temperature Tf in the small fuel tank (3) and the ambient temperature Te is not greater than a set oil temperature limit Ts; if the difference between the fuel temperature Tf in the small fuel tank (3) and the ambient temperature Te is not greater than the set oil temperature limit Ts, determining that the temperature sensor has no faults.

5. The method for controlling a fuel supply system according to claim 4, wherein: In step S002, judging that the temperature sensor is not faulty also includes: if the difference between the fuel temperature Tf in the small fuel tank (3) and the ambient temperature Te is greater than the set oil temperature limit Ts, determining that the temperature sensor is faulty, and redefining the fuel temperature Tf in the small fuel tank (3) to be equal to the difference between the ambient temperature Te and the manually preset temperature.

6. The method for controlling a fuel supply system according to claim 2, wherein: In S001, if the ambient temperature Te is greater than the first set temperature T1, the engine is directly started (100).

7. The method for controlling a fuel supply system according to claim 2, wherein: In S003, when the fuel temperature Tf in the small fuel tank (3) is between the second set temperature T2 and the first set temperature T1, wherein the second set temperature T2 is lower than the first set temperature T1, the first set time = T11, the second set time = T21, and the third set time = T31; If the fuel temperature Tf in the small fuel tank (3) is lower than the second set temperature T2, the first set time = T12, the second set time = T22, the third set time = T33, T12>T11, T22>T21, T32>T31.

8. The method for controlling a fuel supply system according to claim 3, wherein: In S007, if the water temperature of the cooling water of the engine (100) is lower than the set water temperature limit value Tw, then S009 is executed; S009: Obtaining the power-on time of the heating tube (31), the rotation speed n of the engine (100), and the vehicle speed V; If the power-on time of the heating tube (31) is greater than or equal to the set working time Th, the speed n of the engine (100) is not 0, and the speed V of the vehicle is not 0, then the process returns to S007.

9. The method for controlling a fuel supply system according to claim 8, wherein: In S009, if the power-on time of the heating pipe (31) is greater than or equal to the set working time Th and the speed n of the engine (100) is 0, the fuel supply system is powered off.

10. The method for controlling a fuel supply system according to claim 8, wherein: The plurality of heating tubes (31) are arranged at intervals. In S009, if the power-on time of the heating tubes (31) is greater than or equal to the set working time Th, the speed n of the engine (100) is not 0 and the speed V of the vehicle is 0, a portion of the heating tubes (31) are powered off, and the other portion of the heating tubes (31) continue to be powered on, and the process returns to S007.

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