Intelligent switching oil supply system for tractor and method thereof

Abstract

Tractor intelligent switching oil supply system and method thereof, relate to the technical field of tractor, wherein the tractor intelligent switching oil supply system comprises: an oil supply circuit comprising a supply tank, a main oil inlet pipe, an engine and a main oil return pipe connected in series, and a secondary filter connected in series on the main oil inlet pipe; the supply tank comprises a main tank for filling high-grade diesel oil and a secondary tank for filling low-grade diesel oil, and the oil inlet end and the oil outlet end of the main tank and the secondary tank are connected to the corresponding main oil inlet pipe and main oil return pipe through electromagnetic switches; a flushing mechanism comprising a secondary oil inlet pipe and a secondary oil return pipe; the secondary oil inlet pipe is connected in parallel on the main oil inlet pipe between the secondary filter and the engine through two electromagnetic switches. After adopting the system and method, the diesel engine does not need to idle for a long time or manually predict the shutdown time in advance, the fuel consumption of non-operation time is reduced, and the use cost of the tractor under low-temperature and low-grade diesel oil conditions is reduced.

Description

Technical Field

[0001] This invention relates to the field of tractor technology, specifically to an intelligent switching fuel supply system and method for tractors. Background Technology

[0002] In Northeast my country and Xinjiang, winter temperatures are low, requiring tractors to operate in temperatures as low as -25°C or even lower. High-grade diesel fuel crystallizes at low temperatures and cannot be used directly in diesel engines, while low-grade diesel fuel, with its lower crystallization temperature, can be used directly. However, different grades of diesel fuel have different prices. For example, the price difference between 0# and -35# diesel is about 1 yuan per liter. If users in low-temperature areas use -35# diesel for all operations, their operating costs will increase significantly.

[0003] Currently, there are two main methods used in China to address the issue of needing to use low-grade diesel fuel and increasing operating costs in low-temperature conditions for automobiles and construction machinery. The main difference lies in the starting method: ① A dual-tank system: the auxiliary tank is filled with high-grade diesel fuel, which is liquefied through electric heating before the diesel engine is started; ② A dual-tank system: the auxiliary tank is filled with low-grade diesel fuel, which is drawn into the auxiliary tank during engine start-up. After starting, the waste heat from the engine heats the high-grade diesel fuel in the main tank, restoring its fluidity before switching to the high-grade, low-priced diesel fuel supplied from the main tank. For tractors, both methods have drawbacks. Using electric heating to start the tractor will reduce the battery capacity, which may prevent the diesel engine from starting. Also, all parts such as the fuel lines need to be heated, and you need to wait for the diesel in the auxiliary fuel tank to liquefy before starting, which will delay agricultural operations. The existing low-grade diesel starting method requires the diesel engine to idle for a long time before shutdown, or manual prediction of shutdown time, and switching to low-grade fuel supply to fill the fuel line with low-grade diesel for easy start-up next time. However, tractors generally have at least two-stage filtration, and the diesel engine needs to idle for a long time to completely remove high-grade diesel. This results in a large amount of unnecessary fuel consumption during non-operation time. Tractors usually operate under load, and the operating conditions are complex. It is not easy for humans to predict the shutdown time, and misjudgment is also easy. Summary of the Invention

[0004] The purpose of this invention is to propose an intelligent switching fuel supply system and method for tractors, which eliminates the need for diesel engines to idle for extended periods or for manual prediction of shutdown time, thereby reducing fuel consumption during non-operational periods and lowering the operating costs of tractors under low-temperature and low-grade diesel conditions.

[0005] The technical solution adopted in this invention is: a tractor intelligent switching fuel supply system, comprising: The fuel supply circuit includes a fuel supply tank, a main fuel inlet pipe, an engine, and a main fuel return pipe connected in series. A secondary filter is connected in series on the main fuel inlet pipe. The fuel supply tank includes a main fuel tank for refueling high-grade diesel and an auxiliary fuel tank for refueling low-grade diesel. The inlet and outlet ends of the main fuel tank and the auxiliary fuel tank are respectively connected to the corresponding main inlet pipe and main return pipe via electromagnetic switches. The flushing mechanism includes a secondary oil inlet pipe and a secondary oil return pipe. The secondary oil inlet pipe is connected in parallel to the main oil inlet pipe between the secondary filter and the engine via two electromagnetic switches. An electric pump and a temporary fuel tank for storing low-grade diesel fuel are connected in series on the secondary oil inlet pipe. One end of the secondary oil return pipe is connected to the main fuel tank, and the other end of the secondary oil return pipe is connected to the secondary oil inlet pipe between the electric pump and the temporary fuel tank via an electromagnetic switch. The controller, whose output terminals are electrically connected to the electromagnetic switch and the electric pump respectively, is configured to: control the electromagnetic switch to switch the oil flow direction when receiving a tractor stop signal; perform a flushing procedure using the engine to replace the high-grade diesel in the engine with low-grade diesel; and after the engine is shut down, perform a flushing procedure using the electric pump to replace the high-grade diesel in the secondary filter with low-grade diesel and replenish the low-grade diesel in the temporary fuel tank.

[0006] As a preferred embodiment, the system also includes a diesel verification module for determining whether the auxiliary fuel tank contains low-grade diesel fuel, and the output of the diesel verification module is electrically connected to the input of the controller. The controller is configured to: when receiving a tractor start signal, first determine whether the main fuel tank and the auxiliary fuel tank both contain high-grade diesel fuel; if so, then the flushing procedure is not executed when the controller receives a tractor stop signal; if not, then the flushing procedure is executed when the controller receives a tractor stop signal.

[0007] As a preferred embodiment, it also includes a temperature sensor for detecting the current ambient temperature value and a diesel heating mechanism for heating the high-grade diesel fuel in the main fuel tank, with the input terminal of the controller electrically connected to the output terminal of the temperature sensor; The controller is configured to: when receiving a tractor start signal, first determine the temperature difference between the current ambient temperature and the crystallization temperature of high-grade diesel, and selectively activate the diesel heating mechanism according to the temperature difference.

[0008] As a preferred embodiment, the diesel heating mechanism includes an openable and closable antifreeze heating pipe arranged in the main fuel tank. The antifreeze heating pipe is connected to the heat exchange pipeline of the engine. When the ambient temperature is lower than the crystallization temperature of high-grade diesel, the engine heat is used to heat the high-grade diesel in the main fuel tank.

[0009] As a preferred option, the antifreeze heating pipes are evenly distributed within the main oil tank.

[0010] As a preferred embodiment, the controller also includes a human-machine interface module configured on the controller for the operator to transmit control signals and / or diesel fuel grade information to the controller.

[0011] As a preferred embodiment, a storage module is also included for storing the crystallization temperature value of diesel fuel and / or diesel fuel grade information.

[0012] As a preferred embodiment, the temporary fuel tank is located near the engine, and the volume of the temporary fuel tank is configured such that the amount of low-grade diesel fuel stored in it is at least sufficient to replace the high-grade diesel fuel in the engine with low-grade diesel fuel.

[0013] A tractor intelligent switching fuel supply method, wherein the method utilizes a tractor intelligent switching fuel supply system and executes the following flushing procedure when its controller receives a tractor stop signal: S601, The controller controls the electromagnetic switch to connect the temporary fuel tank, engine and main fuel tank in sequence; the controller controls the engine to draw fuel from the temporary fuel tank and return fuel to the main fuel tank, continuing for a first set time until the high-grade diesel fuel in the engine is replaced with low-grade diesel fuel. S602. The engine is turned off. The controller controls the electromagnetic switch to connect the auxiliary fuel tank, secondary filter, electric pump and main fuel tank in sequence. The controller controls the electric pump to draw fuel from the auxiliary fuel tank, and the fuel returns to the main fuel tank through the secondary filter. This continues for a second set time until the high-grade diesel fuel in the secondary filter is replaced with low-grade diesel fuel. S603, the controller controls the electromagnetic switch to connect the auxiliary oil tank, the secondary filter, the electric pump and the temporary oil tank in sequence; controls the electric pump to continue to draw oil from the auxiliary oil tank, return the oil through the secondary filter to the temporary oil tank, and continue for a third set time to replenish the low grade diesel oil in the temporary oil tank.

[0014] As a preferred embodiment, the controller performs the following steps when it receives a tractor start signal from the operator: S1. The diesel fuel confirmation module determines whether the main fuel tank and the auxiliary fuel tank both contain high-grade diesel fuel; if yes, proceed to step S2; if no, proceed to step S3. S2. The controller controls the electromagnetic switch to connect the oil supply circuit. The engine runs and draws oil from the main oil tank and / or auxiliary oil tank, which then circulates through the secondary filter, engine, main oil tank and / or auxiliary oil tank in sequence. After the operation is completed and the tractor stops, there is no need to perform the flushing procedure. S3. The temperature sensor detects the current ambient temperature value and transmits it to the controller. The controller determines whether the current ambient temperature value is greater than the crystallization temperature value of the high-grade diesel fuel in the main fuel tank. If not, proceed to step S4; if yes, proceed to step S5. S4. The controller controls the electromagnetic switch to draw low-grade diesel fuel from the auxiliary fuel tank in the fuel supply circuit into the engine. At the same time, the diesel heating mechanism is activated to heat the high-grade diesel fuel in the main fuel tank. After the high-grade diesel fuel reaches a liquefied state, the process proceeds to step S5. S5. Switch the electromagnetic switch to draw high-grade diesel fuel from the main fuel tank in the fuel supply circuit into the engine; after receiving the tractor stop signal at the end of the operation, start the flushing procedure from step S601.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Reduce the operating costs for tractor users in cold and frigid regions and increase their competitive advantage in the market.

[0016] 2. Multi-point heating allows for faster liquefaction of high-grade diesel fuel, making it more suitable for tractor use.

[0017] 3. After starting the diesel engine, the entire process is automated and intelligent, requiring no manual intervention and reducing human error. In addition, the diesel engine has a shorter idling time to flush the pipes and consumes less fuel during non-operational periods.

[0018] 4. The method, structure and installation are simple, versatile and do not increase costs too much, making it suitable for use with a variety of tractors. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the intelligent switching fuel supply system for tractors in this invention; Figure 2 This is a schematic diagram of a portion of the oil circuit of the intelligent switching oil supply system for tractors in this invention; Figure 3 This is a schematic diagram of another part of the oil circuit of the intelligent switching oil supply system for tractors in this invention; Figure 4 This is a control diagram of the intelligent switching fuel supply system for tractors in this invention; Figure 5 This is a flowchart illustrating the intelligent switching fuel supply method for tractors in this invention.

[0021] Reference numerals: 1. Main oil inlet pipe; 2. Engine; 3. Main oil return pipe; 4. Secondary filter; 5. Main fuel tank; 6. Auxiliary fuel tank; 7. Auxiliary oil inlet pipe; 8. Auxiliary oil return pipe; 9. Electric pump; 10. Temporary fuel tank; 11. Controller; 12. Temperature sensor; 13. Antifreeze heating pipe; 14. Human-machine interface module; 15. Storage module; 16. Diesel fuel confirmation module; 17. First electromagnetic switch; 18. Second electromagnetic switch; 19. Third electromagnetic switch; 20. Fourth electromagnetic switch; 21. Fifth electromagnetic switch. Detailed Implementation

[0022] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," or "the," etc., used in the specification and claims of this patent application do not express a limitation on quantity, but rather indicate the presence of at least one; the terms "first," "second," and "third," as used herein, should not be considered as a limitation on the order of components, but are merely for distinguishing different components; the terms "comprising," "including," etc., indicate that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0024] To more clearly describe the intelligent fuel supply switching system and method of this tractor, in conjunction with the appendix... Figure 1-5 This embodiment is described as follows: like Figure 1-5 As shown, the tractor's intelligent switching fuel supply system includes a fuel supply circuit, a flushing mechanism, and a controller 11. The fuel supply circuit includes a fuel supply tank, a main fuel inlet pipe 1, an engine 2, and a main fuel return pipe 3 connected in series. A secondary filter 4 is connected in series on the main fuel inlet pipe 1. The fuel supply tank includes a main fuel tank 5 for filling high-grade diesel fuel and an auxiliary fuel tank 6 for filling low-grade diesel fuel. The inlet and outlet ends of the main fuel tank 5 and the auxiliary fuel tank 6 are respectively connected to the corresponding main fuel inlet pipe 1 and main fuel return pipe 3 via electromagnetic switches. The flushing mechanism includes a secondary oil inlet pipe 7 and a secondary oil return pipe 8. The secondary oil inlet pipe 7 is connected in parallel to the main oil inlet pipe 1 between the secondary filter 4 and the engine 2 via two electromagnetic switches. An electric pump 9 and a temporary fuel tank 10 used only for storing low-grade diesel fuel are connected in series on the secondary oil inlet pipe 7. One end of the secondary oil return pipe 8 is connected to the main fuel tank 5, and the other end of the secondary oil return pipe 8 is connected to the secondary oil inlet pipe 7 between the electric pump 9 and the temporary fuel tank 10 via an electromagnetic switch. The output of controller 11 is electrically connected to electromagnetic switch and electric pump 9 respectively. When the auxiliary oil tank 6 contains low grade diesel, controller 11 is configured to: control electromagnetic switch to switch oil flow direction when receiving tractor stop signal; use engine 2 to perform flushing procedure to replace high grade diesel in engine 2 with low grade diesel; after engine 2 is shut down, use electric pump 9 to perform flushing procedure to replace high grade diesel in secondary filter 4 with low grade diesel, and replenish low grade diesel in temporary oil tank 10.

[0025] The main fuel tank 5 has a large capacity and is filled with high-grade diesel fuel; the auxiliary fuel tank 6 has a small capacity and is filled with low-grade diesel fuel; the temporary fuel tank 10 has a very small capacity and requires filling with low-grade diesel fuel once before the tractor first uses the system. It does not need to be filled with fuel at other times. Its function is to provide low-grade diesel fuel to the diesel engine for a short period before shutdown to flush out residual high-grade diesel fuel in the engine's diesel pipelines. This invention uses a dual fuel tank system (main and auxiliary) to supply diesel fuel of different grades, and adds a very small temporary fuel tank 10. By optimizing the fuel supply algorithm and controlling the working state of the electromagnetic switches in each pipeline to determine the direction of diesel fuel inflow and outflow, this invention solves the problem of users needing to fill with low-grade diesel fuel and increasing operating costs when using tractors in low-temperature conditions, reducing fuel consumption during non-operational periods, without requiring the diesel engine to idle for a long time or requiring manual prediction of shutdown time before shutdown.

[0026] It also includes a diesel verification module 16 for determining whether the auxiliary fuel tank 6 contains low-grade diesel fuel. The output of the diesel verification module 16 is electrically connected to the input of the controller 11. The controller 11 is configured to: when receiving a tractor start signal, first determine whether the main fuel tank 5 and the auxiliary fuel tank 6 both contain high-grade diesel fuel. If so, the flushing procedure is not executed when the controller 11 receives a tractor stop signal; if not, the flushing procedure is executed when the controller 11 receives a tractor stop signal.

[0027] It also includes a temperature sensor 12 for detecting the current ambient temperature and a diesel heating mechanism for heating the high-grade diesel fuel in the main oil tank 5. The input terminal of the controller 11 is electrically connected to the output terminal of the temperature sensor 12. The controller 11 is configured to: when receiving the tractor start signal, first determine the temperature difference between the current ambient temperature and the crystallization temperature of the high-grade diesel fuel, and selectively activate the diesel heating mechanism according to the temperature difference.

[0028] The diesel heating system includes an openable and closable antifreeze heating pipe 13 located within the main fuel tank 5. The antifreeze heating pipe 13 connects to the heat exchange pipes of the engine 2. When the ambient temperature is below the crystallization temperature of high-grade diesel fuel, the heat from the engine 2 is used to heat the high-grade diesel fuel in the main fuel tank 5, eliminating the need for electric heating and reducing the tractor's power consumption. The antifreeze heating pipe 13 is evenly distributed within the main fuel tank 5 to ensure heating rate and uniformity.

[0029] It also includes a human-machine interface module 14 configured on the controller 11, used by the operator to transmit control signals and / or diesel fuel grade information to the controller 11. The tractor operator transmits tractor start signals and tractor stop signals to the controller 11 through the buttons on the human-machine interface module 14. Each time diesel fuel is added, the diesel fuel grade information of the main fuel tank 5 and the auxiliary fuel tank 6 is manually transmitted to the controller 11 through the buttons on the human-machine interface module 14.

[0030] The controller 11 includes at least one storage module 15 for storing the crystallization temperature value of diesel fuel, diesel fuel grade information, and control program. The diesel fuel confirmation module 16 can retrieve the diesel fuel grade information from the main fuel tank 5 and the auxiliary fuel tank 6 stored in the storage module 15, compare the diesel fuel grade information of the two, and feed the comparison result back to the controller 11.

[0031] In the above embodiment, the temporary fuel tank 10 is designed to be located close to the engine 2. The volume of the temporary fuel tank 10 does not need to be too large. Its volume is configured such that the amount of low-grade diesel fuel stored inside is at least sufficient to replace the high-grade diesel fuel in the engine 2 with low-grade diesel fuel.

[0032] A method for intelligent switching of fuel supply for tractors, utilizing the aforementioned intelligent switching of fuel supply system for tractors, includes the following steps: S1. When the controller 11 receives the tractor start signal from the operator, it transmits the diesel grade information of the main fuel tank 5 and the auxiliary fuel tank 6 to the controller 11 through the diesel confirmation module. The controller 11 then determines whether the main fuel tank 5 and the auxiliary fuel tank 6 are both high grade diesel. If so, it proceeds to S2 according to the traditional fuel inlet and outlet circuit. If not, it proceeds to S3. S2, Controller 11 controls the electromagnetic switch to connect the oil supply circuit, and Engine 2 starts to draw oil from the main oil tank 5 and / or auxiliary oil tank 6, then circulates the oil through the secondary filter 4, Engine 2, main oil tank 5 and / or auxiliary oil tank 6 in sequence; after the operation ends, it receives the tractor stop signal and enters the next step; see reference Figure 2In this step, the main fuel tank 5 and the auxiliary fuel tank 6 can be used independently. After the diesel fuel in the main fuel tank 5 is used up, switch to the auxiliary fuel tank 6 for fuel supply. The auxiliary fuel tank 6 does not occupy the overall layout space of the tractor. In the figure, routes 01 and 02 are the main fuel tank fuel supply line and the auxiliary fuel tank fuel supply line, respectively. In the main fuel tank fuel supply line, the fifth electromagnetic switch 21 is connected to the main fuel tank 5, and the first electromagnetic switch 17 is connected to the main fuel tank 5. Switch the second electromagnetic switch 18 and the fourth electromagnetic switch 20 until the entire auxiliary fuel inlet pipe 7 is closed. The electric pump 9 and the temporary fuel tank 10 are not used. In the auxiliary fuel tank fuel supply line, the fifth electromagnetic switch 21 is connected to the auxiliary fuel tank 6, and the first electromagnetic switch 17 is connected to the auxiliary fuel tank 6. Switch the second electromagnetic switch 18 and the fourth electromagnetic switch 20 until the entire auxiliary fuel inlet pipe 7 is closed. The electric pump 9 and the temporary fuel tank 10 are not used.

[0033] After the operation is completed, when the controller 11 receives the tractor stop signal from the operator, it directly shuts off the engine in the conventional way, does not execute the flushing procedure, and proceeds to step S7.

[0034] S3. Temperature sensor 12 detects the current ambient temperature T1 and transmits it to controller 11. It determines whether the current ambient temperature is greater than the crystallization temperature T2 of the high-grade diesel in the main fuel tank 5. If not, that is, the ambient temperature T1 ≤ the set high-grade diesel crystallization temperature T2, the high-grade diesel in the main fuel tank is in a crystallized state and does not have fluidity, so it cannot be used. Then proceed to step S4. If yes, that is, the ambient temperature T1 > the set high-grade diesel crystallization temperature T2, it means that the high-grade diesel in the main fuel tank 5 is in a liquid state and has fluidity, so it can be used. Then proceed to step S5.

[0035] Considering the large temperature range at different times of the day during the tractor's operating season, when a signal is received to add different grades of diesel to the main and auxiliary fuel tanks, the lowest ambient temperature of the day should be lower than or close to the crystallization temperature of the high-grade diesel. The control program only reads the ambient temperature T1 when the tractor is powered on. When the engine is turned off, regardless of the ambient temperature, the high-grade diesel remaining in the pipes must be flushed out.

[0036] S4. Controller 11 controls the electromagnetic switch to draw low-grade diesel fuel from the auxiliary fuel tank 6 in the fuel supply circuit into the engine 2. At the same time, the diesel heating mechanism is activated to heat the high-grade diesel fuel in the main fuel tank 5. After the high-grade diesel fuel reaches a liquefied state, the process proceeds to step S5.

[0037] S5. Switch the electromagnetic switch to the main oil tank 5 in the fuel supply circuit to draw high-grade diesel fuel into engine 2; after receiving the tractor stop signal after the operation is completed, proceed to step S6; when the tractor is ignited and starts working, the diesel engine draws fuel from the main oil tank 5, and the high-grade diesel fuel passes through the secondary filter 4 to the fuel injection pump of the diesel engine 2, and is delivered to the combustion chamber to generate power through combustion. The unburned remaining diesel fuel is returned to the main oil tank 5.

[0038] S6. After the flushing process, proceed to step S7. The flushing process includes the following steps: S601, see reference Figure 3 In route ①, controller 11 controls the electromagnetic switch (switches the fourth electromagnetic switch 20 to connect the temporary fuel tank 10 and the engine 2, and switches the fifth electromagnetic switch 21 to connect the main fuel tank 5) to connect the temporary fuel tank 10, the engine 2 and the main fuel tank 5 in sequence. Controller 11 controls engine 2 to draw oil from temporary fuel tank 10 and return it to main fuel tank 5. This process continues for a first set time t1 until the high-grade diesel fuel in engine 2 is replaced with low-grade diesel fuel. Temporary fuel tank 10 is used to flush out the high-grade diesel fuel remaining in the pipeline between engine 2's oil pump and injector. The duration of this process is short. S602, the engine is turned off, and the controller 11 controls the electromagnetic switch (switches the first electromagnetic switch 17 to connect to the auxiliary oil tank 6, switches the second electromagnetic switch 18 to connect the secondary filter 4 to the electric pump 9, and switches the third electromagnetic switch 19 to connect the electric pump 9 to the main oil tank 5) so that the auxiliary oil tank 6, the secondary filter 4, the electric pump 9, and the main oil tank 5 are connected in sequence. Controller 11 controls electric pump 9 to draw oil from auxiliary fuel tank 6, which then passes through secondary filter 4 and returns to main fuel tank 5. This process continues for a second set time t2 until the high-grade diesel fuel in secondary filter 4 is replaced with low-grade diesel fuel. The purpose of this step is to flush, dilute, and replace the high-grade diesel fuel in the secondary filter. Due to filter structure limitations, this process takes relatively long. Using an electric pump instead of a diesel engine as the power source reduces diesel engine operating time and unnecessary diesel consumption during non-operational periods.

[0039] S603, controller 11 controls the electromagnetic switches (switching the first electromagnetic switch 17 to connect to the auxiliary oil tank 6, switching the second electromagnetic switch 18 to connect the secondary filter 4 to the electric pump 9, and switching the third electromagnetic switch 19 to connect the electric pump 9 to the temporary oil tank 10) to connect the auxiliary oil tank 6, the secondary filter 4, the electric pump 9 and the temporary oil tank 10 in sequence. The electric pump 9 continues to draw oil from the auxiliary oil tank 6, returns it to the temporary oil tank 10 through the secondary filter 4, and continues for a third set time t3 to replenish the low-grade diesel fuel in the temporary oil tank 10. The purpose of this step is to replenish the low-grade diesel fuel in the temporary oil tank 10 for direct use next time.

[0040] In summary, the purpose of flushing procedures S601, S602, and S603 is to minimize the non-working time of the diesel engine and, while reducing unnecessary fuel consumption, replace the high-grade diesel fuel in the pipeline with low-grade diesel fuel to prevent residual diesel fuel in the pipeline from crystallizing after the tractor stops working and the engine body cools down, thus affecting the next normal start-up.

[0041] S7. The tractor has stopped and the process has ended.

[0042] In the above method, the relationship between ambient temperature and the crystallization temperature of high-grade diesel oil is determined, and then different cases are handled accordingly: When the ambient temperature T1 is greater than the set high-grade diesel crystallization temperature T2, the high-grade diesel in the main fuel tank is in a liquid state and has fluidity, so it can be used and therefore there is no need to heat the main fuel tank 5. When the tractor is started, the diesel engine draws fuel from the main fuel tank 5. The high-grade diesel passes through the secondary filter 4 to the diesel engine injection pump and is delivered to the combustion chamber, where it is burned to generate power. The unburned diesel fuel is returned to the main fuel tank 5. When the work is finished, the driver activates the ignition switch and executes the flushing procedures S601, S602, and S603 in sequence.

[0043] When the ambient temperature T1 is less than or equal to the set high-grade diesel crystallization temperature T2, the high-grade diesel in the main fuel tank 5 is in a crystalline state, lacks fluidity, and is unusable. Therefore, the main fuel tank 5 needs to be heated. When the tractor starts working, the diesel engine draws fuel from the auxiliary fuel tank 6. Low-grade diesel passes through the secondary filter 4 to the diesel engine's fuel injection pump, and the remaining diesel returns to the auxiliary fuel tank 6. Simultaneously, the waste heat of the diesel engine is used to heat the high-grade diesel in the main fuel tank 5, causing it to liquefy, for a set time t4. Since tractor fuel tanks are generally rectangular with a large span in the front-to-back direction, antifreeze is added at multiple points in the front, middle, and rear, especially near the inlet pipe, return pipe, and fuel level sensor, to heat the high-grade diesel in the main fuel tank 5. After the predetermined time t4 is reached, the main... The diesel fuel in fuel tank 5 is liquefied to meet the requirements of the diesel engine. The fuel inlet and outlet routes of the diesel engine are switched to draw fuel from the main fuel tank 5. High-grade diesel fuel passes through the secondary filter 4 to the diesel engine injection pump. The unburned remaining diesel fuel returns to the main fuel tank 5. At the same time, since the diesel fuel is pressurized by the diesel engine injection pump, the return oil temperature is generally 40-60℃, which maintains the liquefied state of the diesel fuel in the main fuel tank 5 and can stop the heat exchange between the antifreeze and the diesel fuel in the main fuel tank. After the operation is completed, the ignition switch is turned on, and the flushing procedure S601, S602 and S603 are executed in sequence.

[0044] It should be noted that the values ​​of t1, t2, t3, and t4 are values ​​obtained by the tractor manufacturer based on experiments and their own component structures. The intelligent switching fuel supply method control program for tractors can set different fixed values ​​for t1, t2, and t3 for different tractor models. The value of t4 is affected by factors such as T1, T2, the structure of the main fuel tank components, and the number and location of the heat exchange interfaces between the antifreeze and high-grade diesel. The larger the difference between T1 and T2, the larger the value of t4. It is necessary to set up a database for the program to calculate the difference between T1 and T2 before each start-up and automatically match the value of t4.

[0045] The state of all electromagnetic switches can be adjusted by the controller according to the program requirements.

[0046] The parts not described in detail in the above embodiments are existing technologies.

[0047] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A tractor intelligent switching fuel supply system, characterized in that, include: The oil supply circuit includes a supply oil tank, a main oil inlet pipe (1), an engine (2) and a main oil return pipe (3) connected in series. A secondary filter (4) is connected in series on the main oil inlet pipe (1). The fuel supply tank includes a main fuel tank (5) for refueling high-grade diesel and an auxiliary fuel tank (6) for refueling low-grade diesel. The inlet and outlet of the main fuel tank (5) and the auxiliary fuel tank (6) are respectively connected to the corresponding main inlet pipe (1) and main return pipe (3) via electromagnetic switches. The flushing mechanism includes a secondary oil inlet pipe (7) and a secondary oil return pipe (8); the secondary oil inlet pipe (7) is connected in parallel to the main oil inlet pipe (1) between the secondary filter (4) and the engine (2) via two electromagnetic switches, and an electric pump (9) and a temporary oil tank (10) for storing low-grade diesel fuel are connected in series on the secondary oil inlet pipe (7); one end of the secondary oil return pipe (8) is connected to the main oil tank (5), and the other end of the secondary oil return pipe (8) is connected in switchably to the secondary oil inlet pipe (7) between the electric pump (9) and the temporary oil tank (10) via an electromagnetic switch; The controller (11) is electrically connected to the electromagnetic switch and the electric pump (9) respectively at its output terminals. When the auxiliary oil tank (6) contains low-grade diesel, the controller (11) is configured to: control the electromagnetic switch to switch the oil flow direction when receiving the tractor stop signal; use the engine (2) to perform a flushing procedure to replace the high-grade diesel in the engine (2) with low-grade diesel; after the engine (2) is shut down, use the electric pump (9) to perform a flushing procedure to replace the high-grade diesel in the secondary filter (4) with low-grade diesel, and replenish the low-grade diesel in the temporary oil tank (10).

2. The intelligent switching fuel supply system for tractors according to claim 1, characterized in that: It also includes a diesel verification module (16) for determining whether the auxiliary fuel tank (6) contains low-grade diesel fuel, and the output of the diesel verification module (16) is electrically connected to the input of the controller (11). The controller (11) is configured to: when receiving the tractor start signal, first determine whether the main oil tank (5) and the auxiliary oil tank (6) are both high-grade diesel. If so, the flushing procedure is not executed when the controller (11) receives the tractor stop signal; if not, the flushing procedure is executed when the controller (11) receives the tractor stop signal.

3. The intelligent switching fuel supply system for tractors according to claim 1, characterized in that: It also includes a temperature sensor (12) for detecting the current ambient temperature value and a diesel heating mechanism for heating the high-grade diesel fuel in the main oil tank (5), with the input of the controller (11) electrically connected to the output of the temperature sensor (12); The controller (11) is configured to: when receiving the tractor start signal, first determine the temperature difference between the current ambient temperature and the crystallization temperature of high-grade diesel, and selectively activate the diesel heating mechanism according to the temperature difference.

4. The intelligent switching fuel supply system for tractors according to claim 3, characterized in that: The diesel heating mechanism includes an openable and closable antifreeze heating pipe (13) arranged in the main oil tank (5). The antifreeze heating pipe (13) is connected to the heat exchange pipe of the engine (2). When the ambient temperature is lower than the crystallization temperature of high-grade diesel, the high-grade diesel in the main oil tank (5) is heated by the heat of the engine (2).

5. The intelligent switching fuel supply system for tractors according to claim 4, characterized in that: The antifreeze heating pipes (13) are evenly distributed within the main oil tank (5).

6. The intelligent switching fuel supply system for tractors according to claim 1, characterized in that: It also includes a human-machine interface module (14) configured on the controller (11) for the operator to transmit control signals and / or diesel grade information to the controller (11).

7. The intelligent switching fuel supply system for tractors according to claim 6, characterized in that: It also includes a storage module (15) for storing the crystallization temperature value of diesel fuel and / or diesel fuel grade information.

8. The intelligent switching fuel supply system for tractors according to claim 1, characterized in that: A temporary fuel tank (10) is located near the engine (2), and the volume of the temporary fuel tank (10) is configured such that the amount of low-grade diesel fuel stored in it is at least sufficient to replace the high-grade diesel fuel in the engine (2) with low-grade diesel fuel.

9. A tractor intelligent switching fuel supply method, characterized in that: The method utilizes the tractor intelligent switching fuel supply system according to any one of claims 1-8, and executes the following flushing procedure when its controller (11) receives a tractor stop signal: S601, the controller (11) controls the electromagnetic switch to connect the temporary oil tank (10), the engine (2) and the main oil tank (5) in sequence; the controller (11) controls the engine (2) to draw oil from the temporary oil tank (10) and return the oil to the main oil tank (5), and continues for a first set time until the high grade diesel in the engine (2) is replaced with low grade diesel. S602, the engine is turned off, and the controller (11) controls the electromagnetic switch to connect the auxiliary oil tank (6), the secondary filter (4), the electric pump (9), and the main oil tank (5) in sequence; the controller (11) controls the electric pump (9) to draw oil from the auxiliary oil tank (6), and return the oil to the main oil tank (5) through the secondary filter (4) for a second set time until the high grade diesel oil in the secondary filter (4) is replaced with low grade diesel oil; S603, the controller (11) controls the electromagnetic switch to connect the auxiliary oil tank (6), the secondary filter (4), the electric pump (9) and the temporary oil tank (10) in sequence; controls the electric pump (9) to continue to draw oil from the auxiliary oil tank (6), and return the oil to the temporary oil tank (10) through the secondary filter (4) for a third set time to replenish the low grade diesel in the temporary oil tank (10).

10. The intelligent switching fuel supply method for tractors according to claim 9, characterized in that: When the controller (11) receives the tractor start signal from the operator, it performs the following steps: S1. The diesel fuel confirmation module determines whether the main fuel tank (5) and the auxiliary fuel tank (6) both contain high-grade diesel fuel; if yes, proceed to step S2; if no, proceed to step S3. S2, The controller (11) controls the electromagnetic switch to connect the oil supply circuit, and the engine (2) runs to draw oil from the main oil tank (5) and / or the auxiliary oil tank (6), and then circulates through the secondary filter (4), the engine (2), the main oil tank (5) and / or the auxiliary oil tank (6) in sequence; after the operation ends and the tractor stops, there is no need to perform the flushing procedure; S3. The current ambient temperature value is detected by the temperature sensor (12) and transmitted to the controller (11). The controller (11) determines whether the current ambient temperature value is greater than the crystallization temperature value of the high grade diesel oil in the main oil tank (5). If not, proceed to step S4; if yes, proceed to step S5. S4. The controller (11) controls the electromagnetic switch to draw the low-grade diesel fuel from the auxiliary oil tank (6) in the fuel supply circuit into the engine (2), and at the same time activates the diesel heating mechanism to heat the high-grade diesel fuel in the main oil tank (5) until the high-grade diesel fuel reaches the liquefied state and then proceeds to step S5. S5. Switch the electromagnetic switch to the main oil tank (5) in the oil supply circuit to draw high-grade diesel fuel into the engine (2); after the operation is completed and the tractor stops, start the flushing procedure from step S601.

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