A low-temperature antifreeze and emission reduction integrated device and antifreeze method for a fuel system

Abstract

The present invention belongs to the technical field of oil pipe antifreeze technology and provides an integrated low-temperature antifreeze and emission reduction device and antifreeze method for a fuel system, comprising a cooling system and a heating system. The cooling system comprises a low-temperature thermostat, a high-temperature thermostat, a one-way valve, and a water pump, which are sequentially connected to the engine via a coolant pipe. The water pump is connected to the engine, and the low-temperature thermostat and the water pump are connected via a coolant pipe. An exhaust gas waste heat recovery device is installed on the coolant pipe between the engine and the low-temperature thermostat. The heating system comprises a three-way valve, a thermoelectric device, a battery, a controller, and a heating wire, which are sequentially connected between the engine and the fuel tank. The heating wire is continuously wound around the oil supply and return lines. The three-way valve is also connected to the exhaust gas waste heat recovery device, and the three-way valve and the thermoelectric device are connected to the exhaust pipe. The present invention has the advantages of integrated antifreeze, energy saving and emission reduction, and strong environmental adaptability.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil pipe antifreeze, and in particular relates to a low-temperature antifreeze and emission reduction integrated device and an antifreeze method for a fuel system. Background Art

[0002] When vehicles, ships, low-altitude manned aircraft, high-altitude drones, and other vehicles operate at high latitudes or altitudes, their fuel systems face the problem of low-temperature antifreeze protection. The fuel system primarily includes the engine, fuel tank, fuel level sensor, fuel pump, fuel vapor recovery tank, fuel pressure regulator and return line, air filter, fuel injectors, and fuel filter. In low-temperature environments, the fuel in the fuel system can become viscous or even freeze. If the fuel in the oil lines and fuel tank freezes before the engine starts, the engine will not start, preventing the vehicle from igniting properly. If the fuel in the oil lines and fuel tank is not effectively insulated while the engine is running, the fuel will become viscous or even freeze, causing the entire fuel system to malfunction. In either case, significant damage will be done to the fuel system and may even cause the vehicle to lose power.

[0003] At present, the low-temperature antifreeze and emission reduction methods for fuel systems are mainly aimed at the slow freezing and rapid thawing of the oil circuit and fuel tank, as well as the recovery of waste heat from the vehicle. First, in terms of slow freezing of the oil circuit, Chinese patent document CN 113002293A "A diesel vehicle fuel tank antifreeze device capable of utilizing exhaust gas heat" proposes an antifreeze component that uses exhaust gas heat to act on the inside of the water tank to heat the fuel tank. An extension rod is fixedly connected to the water tank, and a heat conduction component is fixedly connected to the extension rod for transferring heat from the exhaust pipe to the water and heating the water. The exhaust gas heat can be used to heat the fuel tank. However, most of the heat of this device comes from the exhaust gas, and it does not take into account the situation where the oil circuit has been frozen and cannot be started at low temperatures. Chinese patent document CN 207131507U, "A Novel Antifreeze Oil Heating Device," proposes an antifreeze oil heating device that heats the oil pipe by wrapping it with a heating water pipe. The water heats the oil pipe through the cavity formed between the oil pipe and the heating pipe, preventing the diesel in the pipe from solidifying, keeping the pipe unobstructed and preventing diesel vehicles from starting in winter. However, this fails to consider the additional energy consumption of the external heating pipe. Simply increasing energy consumption to prevent freezing of the oil line will place a greater energy burden on the vehicle. Chinese patent document CN 209654142U, "A Cold-Proof and Freeze-Proof Box-Type Diesel Engine," proposes a device for preventing freezing of the oil line and tank. This device employs an insulating shell fixed to the outer wall of the engine tank. The shell has a cavity within it, and mounting grooves on all four inner walls of the shell contain a layer of insulation cotton fixedly installed within the grooves. However, this only addresses the issue of structural design. While simple in design, inexpensive, and easy to use, this method doesn't utilize the vehicle's waste heat, resulting in poor energy efficiency. Without external heat for the fuel tank's oil circuit, it's difficult to achieve a good antifreeze effect. Furthermore, even if the fuel circuit is frozen, it still can't achieve a low-temperature cold start, resulting in significant limitations in its application. Regarding rapid fuel melting, Chinese patent document CN 220869539U, "An Antifreeze Device for a Diesel Engine," proposes an antifreeze device for a diesel engine that utilizes a heating plate and a heating rod. This device primarily uses additional energy to heat the fuel tank and the fuel inside, achieving rapid melting. However, this increases the vehicle's energy consumption to a certain extent, affecting its driving range and other energy supply. Chinese patent document CN 214577448U, "An Antifreeze Device for a Diesel Engine Oil Circuit," proposes a device that utilizes an electric heating wire to heat the oil circuit. This device, through a combination of a heating wire and a flame-retardant layer, heats frozen fuel within the circuit, rapidly melting the frozen fuel.However, this also has the disadvantage of increasing energy consumption, and if heating is required during the process to slow freezing, the energy consumption will be even greater. Finally, regarding waste heat recovery for vehicles, Chinese patent document CN 116044635B, "Energy-saving and Environmentally Friendly Control Device for Internal Combustion Engines and Energy-Saving Antifreeze," proposes an energy-saving and environmentally friendly control device and energy-saving antifreeze for internal combustion engines. These devices primarily recycle waste heat from engine exhaust, helping vehicles save energy while also improving fuel combustion efficiency. However, these devices are uncontrollable and can only be passively regulated, making them unable to adapt to changing environments and the diverse situations faced by vehicles.

[0004] Therefore, it is very important to delay the freezing time of fuel, quickly melt the frozen fuel, and efficiently utilize the heat dissipated by the vehicle itself to reduce vehicle energy consumption and improve the vehicle's low-temperature adaptability. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an integrated low-temperature antifreeze and emission reduction device for a fuel system, which is used in a vehicle fuel system. The fuel system includes: a fuel tank, a fuel supply line connected to the fuel tank in sequence, an engine, and a fuel return line, an oil pump and a fuel filter provided on the fuel supply line, and an exhaust pipe provided on the engine, the fuel return line also being connected to the fuel tank. The integrated low-temperature antifreeze and emission reduction device includes a cooling system and a heating system.

[0006] The cooling system includes: a low-temperature thermostat, a high-temperature thermostat, a one-way valve, and a water pump connected in sequence via a coolant pipe. The low-temperature thermostat and the water pump are respectively connected to the engine. The low-temperature thermostat and the water pump are connected via a coolant pipe. An exhaust gas waste heat recovery device is installed on the coolant pipe between the engine and the low-temperature thermostat. The coolant pipe between the high-temperature thermostat and the one-way valve is wound around the oil supply pipe and the oil return pipe. A radiator connected via the coolant pipe is also provided between the high-temperature thermostat and the water pump.

[0007] The heating system includes: a thermoelectric device, a battery, a controller and a heating wire connected in sequence. The heating wire is continuously wound on the oil supply pipeline and the oil return pipeline. A three-way valve is provided on the exhaust pipe, and the three-way valve is respectively connected to the engine, the exhaust heat recovery device and the thermoelectric device.

[0008] Preferably, the coolant pipe is sleeved on the oil supply pipe and the oil return pipe to form a sleeve structure; the heating wire is located between the coolant pipe and the oil supply pipe and the oil return pipe, and can further heat the oil supply pipe and the oil return pipe.

[0009] Preferably, a heat storage material is filled between the coolant pipe and the heating wire. The heat storage material is a phase change heat storage material or a non-phase change heat storage material. The heat storage material can store heat.

[0010] Preferably, the coolant pipe between the high-temperature thermostat and the one-way valve passes through the interior of the oil tank to heat the oil tank.

[0011] Preferably, the exhaust gas waste heat recovery device surrounds the coolant pipe, and the coolant pipe is spirally arranged in the exhaust gas waste heat recovery device, which can fully utilize the exhaust gas waste heat to heat the coolant pipe.

[0012] Preferably, a baffle that limits the exhaust gas path is provided in the exhaust gas waste heat recovery device, so that the exhaust gas can fully contact the coolant pipe.

[0013] Preferably, fins are provided on the coolant pipe in the exhaust gas waste heat recovery device.

[0014] The present invention also provides an antifreeze method for a fuel system integrating low-temperature antifreeze and emission reduction, comprising the following steps:

[0015] Step 1: Before starting the vehicle, determine whether the fuel temperature is less than a first threshold; if the fuel temperature is less than the first threshold, heat the fuel pipe through the heating wire to thaw the fuel, and the heating wire will no longer heat after the fuel is thawed;

[0016] Step 2: When the fuel temperature is greater than or equal to the first threshold, the vehicle is started. At this time, it is determined whether the coolant temperature is less than the second threshold. If it is less than the second threshold, the coolant needs to be heated. At this time, the exhaust heat recovery device collects the exhaust heat to heat the coolant pipe. Otherwise, no operation is performed.

[0017] Step 3: When the coolant temperature is greater than or equal to a second threshold, the exhaust heat recovery device is shut down. The coolant is then diverted for the first time using the low-temperature and high-temperature thermostats. The diverted coolant is then used to heat the oil supply and return lines. Simultaneously, the thermoelectric device collects exhaust heat to generate electricity and stores it in the battery.

[0018] Step 4: When the coolant temperature rises, it is determined whether the coolant temperature is greater than or equal to a third threshold. If so, it is necessary to dissipate heat from the coolant. A low-temperature thermostat and a high-temperature thermostat are used to divert the coolant a second time, based on the first diversion. The second diverted coolant is dissipated through the radiator. Otherwise, no action is taken.

[0019] Step 5: Determine whether the coolant temperature is greater than or equal to a fourth threshold. If so, the high-temperature thermostat closes the coolant pipe passage between the high-temperature thermostat and the one-way valve. Otherwise, no operation is performed.

[0020] Among them, the first threshold is the freezing temperature of fuel + 5 degrees Celsius, the second threshold is between 70 degrees Celsius and 80 degrees Celsius, the third threshold is between 85 degrees Celsius and 90 degrees Celsius, and the fourth threshold is between 95 degrees Celsius and 100 degrees Celsius.

[0021] Preferably, the coolant pipe between the high-temperature thermostat and the one-way valve passes through the interior of the oil tank, and the oil tank is heated by the coolant.

[0022] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0023] 1. Combining thermoelectric devices with heat storage materials, exhaust gas waste heat is recovered in the form of heat energy and electrical energy, making fuller use of exhaust gas heat, ensuring sufficient energy source for vehicle antifreeze and rapid thawing, and reducing energy waste.

[0024] 2. A triple structure of heating wire, heat storage material and coolant is used to insulate and prevent freezing of the fuel supply system. The heat storage material can not only store the engine heat brought by the coolant, but also absorb and store the remaining heat when the heating wire is heated, thus avoiding energy waste.

[0025] 3. Through the layout design of the coolant circuit, waste heat from the engine exhaust is used to heat the coolant lines through the coolant exhaust heat recovery device, ultimately achieving a rapid cold start of the vehicle. Compared to traditional local heating designs, this system stores heat dissipated during normal vehicle operation to power the heating wire during low-temperature cold starts. This not only solves the problem of frozen oil circuits preventing the vehicle from starting, but also achieves the goal of energy conservation, carbon emission reduction, and environmental protection, energy saving, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of an overall structure provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a heating oil pipe provided in an embodiment of the present invention Figure 1 ;

[0028] Figure 3 A schematic diagram of the structure of a heating oil pipe provided in an embodiment of the present invention Figure 2 ;

[0029] Figure 4 A structural diagram provided for an embodiment of the present invention Figure 1 ;

[0030] Figure 5 A structural diagram provided for an embodiment of the present invention Figure 2 ;

[0031] Figure 6A structural diagram provided for an embodiment of the present invention Figure 3 ;

[0032] Figure 7 A structural diagram provided for an embodiment of the present invention Figure 4 ;

[0033] Figure 8 A flow chart of a heating method provided in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1- Radiator, 2- Low-temperature thermostat, 3- High-temperature thermostat, 4- Fin, 5- Baffle, 6- Three-way valve, 7- Exhaust pipe, 8- Thermoelectric device, 9- Oil supply line, 10- Battery, 11- Controller, 12- Oil pump, 13- Fuel filter, 14- Heating wire, 15- Fuel tank, 16- Heat storage material, 17- Oil inlet, 18- Oil return line, 19- Engine, 20- One-way valve, 21- Exhaust heat recovery device, 22- Water pump, 23- Coolant pipe. DETAILED DESCRIPTION

[0036] A specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiment, and all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In the description of the embodiments of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0039] The terms “first” and “second” and the like in the description and claims of the embodiments of the present invention are used to distinguish different objects rather than to describe a specific order of the objects.

[0040] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0041] like Figure 1 As shown, an embodiment of the present invention provides an integrated low-temperature antifreeze and emission reduction device for a fuel system, which is used in a fuel system of a vehicle. The fuel system includes: a fuel tank 15, a fuel supply line 9 connected to the fuel tank 15 in sequence, an engine 19, and a return oil line 18, an oil pump 12 and a fuel filter 13 provided on the fuel supply line 9, and an exhaust pipe 7 provided on the engine 19. The return oil line 18 is also connected to the fuel tank 15. The integrated low-temperature antifreeze and emission reduction device includes a cooling system and a heating system.

[0042] The cooling system includes: a low-temperature thermostat 2, a high-temperature thermostat 3, a one-way valve 20, and a water pump 22, which are sequentially connected via a coolant pipe 23. The low-temperature thermostat 2 and the water pump 22 are respectively connected to the engine 19. The low-temperature thermostat 2 and the water pump 22 are connected via a coolant pipe 23. An exhaust gas waste heat recovery device 21 is installed on the coolant pipe 23 between the engine 19 and the low-temperature thermostat 2. The coolant pipe 23 between the high-temperature thermostat 3 and the one-way valve 20 is wound around the oil supply line 9 and the oil return line 18.

[0043] The heating system includes: a thermoelectric device 8, a battery 10, a controller 11 and a heating wire 14 connected in sequence. The heating wire 14 is continuously wound on the oil supply pipeline 9 and the oil return pipeline 18. The exhaust pipe 7 is provided with a three-way valve 6, and the three-way valve 6 is respectively connected to the engine 19, the exhaust heat recovery device 21 and the thermoelectric device 8.

[0044] It can be understood that in the embodiment provided by the present invention, the function of the one-way valve 20 is to prevent the coolant from flowing in the reverse direction.

[0045] It can be understood that in the embodiment provided by the present invention, the controller 11 has a fuel temperature detection function. When the temperature is too low, the controller 11 controls the heating wire 14 to heat the fuel supply line 9, the fuel return line 18, and the fuel inlet 17.

[0046] Optionally, in the embodiment provided by the present invention, the oil supply line 9 extends into the fuel tank 15 and is spirally arranged in the fuel tank 15, so as to facilitate rapid melting of the fuel near the oil outlet of the oil supply line 9 and reduce the waiting time for vehicle startup.

[0047] Optionally, in the embodiment provided by the present invention, the battery 10 can be a fixed battery or a mobile battery. Specifically, those skilled in the art can configure it as needed, and the present invention does not limit this.

[0048] Optionally, in the embodiment provided by the present invention, the heating wire 14 can be made of various metals; or it can be replaced by other products capable of heating. Specifically, those skilled in the art can set it according to their needs, and the present invention is not limited to this.

[0049] Preferably, the heating wire 14 is wound in a single layer or multiple layers, and can be tightly wound or sparsely wound. Specifically, those skilled in the art can set it according to their needs, and the present invention is not limited to this.

[0050] Furthermore, in the embodiment provided by the present invention, the coolant pipe 23 passes through the fuel tank 15 and can defrost the fuel at the same time, further improving the defrosting efficiency.

[0051] Furthermore, the thickness of the heating wire 14 is preferably between 1 cm and 2 cm. If the thickness is less than 1 cm, effective heating is not possible, and if the thickness is greater than 2 cm, the power utilization rate is likely to be too low. Specifically, those skilled in the art can set it according to their needs, and the present invention is not limited thereto.

[0052] like Figure 2 、 Figure 3 As shown, in the embodiment provided by the present invention, the coolant pipe 23 is sleeved on the oil supply pipe 9 and the oil return pipe 18 to form a sleeve structure; the heating wire 14 is located between the coolant pipe 23 and the oil supply pipe 9 and the oil return pipe 18.

[0053] It can be understood that the coolant pipe 23 is sleeved on the oil supply pipeline 9 and the oil return pipeline 18 in order to fully utilize the temperature of the coolant to heat the oil supply pipeline 9, the oil return pipeline 18 and the oil inlet 17 in a low temperature environment.

[0054] It can be understood that when the fuel is frozen, the temperature of the coolant is also very low or even frozen, and the heating wire 14 is located between the coolant pipe 23 and the oil supply pipe 9 and the oil return pipe 18, which can heat the oil supply pipe 9, the oil return pipe 18 and the coolant pipe 23, thereby improving the thawing efficiency and providing energy utilization.

[0055] Furthermore, in the embodiment provided by the present invention, the cavity thickness of the coolant pipe 23 including the oil supply line 9 and the oil return line 18 is between 1 cm and 2 cm. If the thickness of the cavity is less than 1 cm, the coolant inflow cannot effectively achieve heating. If the thickness of the cavity is higher than 2 cm, the coolant pipe 23 is likely to occupy a large volume.

[0056] Furthermore, in the embodiment provided by the present invention, a heat storage material 16 is filled between the coolant pipe 23 and the heating wire 14. The heat storage material 16 includes but is not limited to a phase change heat storage material or a non-phase change heat storage material, etc. The specific material can be determined according to actual conditions. The present invention is only an illustrative example and does not make any limitation on this.

[0057] That is, the outside of the oil supply pipeline 9 and the oil return pipeline 18 are wrapped by the heat storage material 16, the heating wire 14 is inserted into the gap between the oil supply pipeline 9, the oil return pipeline 18 and the heat storage material 16, and the coolant pipe 23 is wrapped outside the heat storage material 16.

[0058] It can be understood that the heat storage material 16 can store the heat energy generated by the heating wire 14, and can also store the heat energy generated by heating the coolant pipe 23, which is used to heat the oil supply pipeline 9 and the oil return pipeline 18. At the same time, the heat storage material also has a heat preservation effect, further enhancing the heat preservation capacity.

[0059] Furthermore, the thickness of the heat storage material 16 is preferably no more than 2 cm. If it exceeds 2 cm, the coolant pipe 23 will not be able to effectively heat the oil supply pipe 9 and the oil return pipe 18. Specifically, those skilled in the art can set it according to their needs, and the present invention is not limited to this.

[0060] In the embodiment provided by the present invention, the oil supply line 9 and the oil return line 18 extend into the fuel tank 15, and the coolant pipe 23 between the high-temperature thermostat 3 and the one-way valve 20 passes through the interior of the fuel tank 15. At this time, the heating wire 14 heats the oil supply line 9 and the oil return line 18 while heating the fuel tank 15. The coolant pipe 23 can also use the temperature of the coolant to heat the fuel tank 15, making full use of the temperature of the coolant to ensure that vehicles, ships, low-altitude manned aircraft, high-altitude drones and other vehicles do not need to worry about low-temperature freezing when operating in high latitudes or high altitudes.

[0061] Preferably, in the embodiment provided by the present invention, the exhaust gas waste heat recovery device 21 surrounds the coolant pipe 23 , and the coolant pipe 23 is spirally arranged inside the exhaust gas waste heat recovery device 21 .

[0062] It can be understood that the exhaust gas waste heat recovery device 21 surrounds the coolant pipe 23 to ensure that the exhaust gas collected by the exhaust gas waste heat recovery device 21 can be heated in all directions around the coolant pipe 23, and the coolant pipe 23 is spirally arranged in the exhaust gas waste heat recovery device 21 in order to maximize the area of ​​the exhaust gas heating coolant pipe 23 within a limited volume and make full use of the heat of the exhaust gas.

[0063] Preferably, in the embodiment provided by the present invention, a baffle 5 for limiting the exhaust gas path is provided in the exhaust gas waste heat recovery device 21 .

[0064] It can be understood that the baffle 5 limits the flow path of the exhaust gas, ensuring that the exhaust gas can increase the contact area with the coolant pipe 23, fully utilize the heat of the exhaust gas, further improve the heating efficiency and thermal energy utilization rate, and reduce unnecessary heat energy loss.

[0065] Preferably, in the embodiment provided by the present invention, fins 4 are provided on the coolant pipe 23 in the exhaust gas waste heat recovery device 21 .

[0066] It can be understood that the fins 4 are heated by contact with the exhaust gas, and the heated fins 4 can further heat the coolant pipe 23 .

[0067] Furthermore, in the embodiment provided by the present invention, the fins 4 can be made of different materials and have different fin spacings. Specifically, those skilled in the art can set them according to their needs, and the present invention does not limit this.

[0068] In the embodiment provided by the present invention, a thermoelectric device 8 for generating electricity is further included; the thermoelectric device 8 is connected to the exhaust pipe 7 through a three-way valve 6 and is connected to the charging port of the battery 10 through a charging line.

[0069] Optionally, in the embodiment provided by the present invention, the thermoelectric device 8 can also be replaced by a structure designed by a simple thermoelectric element; specifically, those skilled in the art can set it by themselves according to needs, and the present invention does not limit this.

[0070] It can be understood that when vehicles, ships, low-altitude manned aircraft, high-altitude drones and other vehicles operate normally, exhaust gas will be discharged directly, but the exhaust gas has a large amount of heat energy. At this time, the thermoelectric device 8 can use the exhaust gas to generate electricity and further convert the heat energy in the exhaust gas into electrical energy.

[0071] Preferably, in the embodiment provided by the present invention, a radiator 1 for dissipating heat to the coolant is further included; one end of the radiator 1 is connected to the high-temperature thermostat 3 through a coolant pipe 23, and the other end is connected to the water pump 22 through the coolant pipe 23.

[0072] It is understandable that when vehicles, ships, low-altitude manned aircraft, high-altitude drones and other vehicles have been running for a period of time, the temperature of the coolant will gradually rise. When the temperature is too high, heat dissipation is required to ensure the cooling efficiency of the coolant.

[0073] Optionally, in the embodiment provided by the present invention, the radiator 1 may be an air-cooled radiator or a water-cooled radiator; specifically, those skilled in the art may configure it according to their needs, and the present invention does not limit this.

[0074] It can be understood that when vehicles, ships, low-altitude manned aircraft, high-altitude drones and other vehicles are operating in high latitudes or high altitudes, the temperature of the coolant is reduced by heating the oil supply line 9, the oil return line 18 and the oil tank 15.

[0075] like Figure 8 As shown, the present invention also provides an antifreeze method for a fuel system that integrates low-temperature antifreeze and emission reduction, comprising the following steps:

[0076] Step 1: Before starting the vehicle, determine whether the fuel temperature is less than a first threshold; if the fuel temperature is less than the first threshold, heat the fuel pipe through the heating wire 14 to thaw the fuel, and the heating wire 14 will no longer heat the fuel after it is thawed;

[0077] Step 2: When the fuel temperature is greater than or equal to the first threshold, the vehicle is started. At this time, it is determined whether the coolant temperature is less than the second threshold. If it is less than the second threshold, the coolant needs to be heated. At this time, the exhaust heat recovery device 21 collects the exhaust heat to heat the coolant pipe 23. Otherwise, no operation is performed.

[0078] Step 3: When the coolant temperature is greater than or equal to the second threshold, the exhaust heat recovery device 21 is shut down. The low-temperature thermostat 2 and the high-temperature thermostat 3 are used to divert the coolant for the first time, and the coolant is used to heat the oil supply pipe 9 and the oil return pipe 18. Simultaneously, the thermoelectric device 8 collects the exhaust heat to generate electricity and stores it in the battery 10.

[0079] Step 4: When the coolant temperature rises, it is determined whether the coolant temperature is greater than a third threshold. If it is, the coolant needs to be dissipated. In this case, the low-temperature thermostat 2 and the high-temperature thermostat 3 perform a second diversion of the coolant on top of the first diversion. The second diversion of the coolant is dissipated through the radiator 1. Otherwise, no operation is performed.

[0080] Step 5: Determine whether the coolant temperature reaches a fourth threshold. If it is greater than or equal to the fourth threshold, the high-temperature thermostat 3 closes the passage of the coolant pipe 23 between the high-temperature thermostat 3 and the one-way valve 20; otherwise, no operation is performed.

[0081] Preferably, in the method provided by the present invention, the first threshold is the freezing temperature of the fuel + 5 degrees Celsius, the second threshold is between 70 degrees Celsius and 80 degrees Celsius, the third threshold is between 85 degrees Celsius and 90 degrees Celsius, and the fourth threshold is between 95 degrees Celsius and 100 degrees Celsius.

[0082] It will be appreciated that the first threshold temperature being 5°C higher than the freezing point of the fuel is intended to prevent the fuel from being too close to the freezing point, even though it is not yet solidified, resulting in a high viscosity. Therefore, the freezing point + 5°C threshold is not fixed and can also be +1°C or +10°C, specifically to prevent high viscosity. Those skilled in the art can adjust this threshold as needed, and this is not a limitation of the present invention.

[0083] It can be understood that the temperature nodes of the second threshold, the third threshold, and the fourth threshold can be set to different temperatures according to different vehicles, different oil samples, and different environments. The present invention is only an illustrative example and does not make any limitation to this. The above temperatures are only exemplary.

[0084] Optionally, in the method provided by the present invention, for example, the oil sample used is No. 20 diesel, which has a freezing point of -20 degrees Celsius. At this time, the first threshold is -15 degrees Celsius, and the second, third, and fourth thresholds are respectively selected as 80 degrees Celsius, 90 degrees Celsius, and 95 degrees Celsius as thresholds.

[0085] Furthermore, in the embodiment provided by the present invention, the coolant pipe 23 between the high-temperature thermostat 3 and the one-way valve 20 passes through the interior of the oil tank 15, and the oil tank 15 is heated by the coolant.

[0086] To facilitate understanding of the technical solutions of the present invention, the present invention provides the following embodiments to assist understanding;

[0087] Example

[0088] like Figure 4 As shown, when the temperature of the vehicle fuel is lower than the first threshold, the fuel may freeze easily in the low temperature environment of extremely cold weather before starting. At this time, the controller controls the heating wire wrapped around the fuel supply line and the fuel return line to heat up, so that the fuel in the fuel supply line, the fuel return line and the fuel inlet of the fuel supply line can be thawed quickly.

[0089] like Figure 5 As shown, when the fuel temperature is greater than or equal to the first threshold and the fuel is not frozen or thawed, the vehicle starts and enters the fuel combustion engine start-up phase. Since the engine coolant temperature is low at the beginning of startup, the normal starting speed of the engine is affected. At this time, the exhaust heat recovery device collects exhaust gas to preheat the coolant pipe to achieve the purpose of rapid engine start-up.

[0090] like Figure 6As shown, when the fuel supply line, return line and fuel tank are thawed and the engine enters normal working state, the coolant does not need to be preheated, the exhaust heat recovery device no longer collects exhaust gas, and the exhaust gas enters the thermoelectric device through the three-way valve. The thermoelectric device converts the heat energy of the exhaust gas into electrical energy and stores it in the battery to prepare for the next start-up of the heating system.

[0091] like Figure 1 、 Figure 6 、 Figure 7 As shown, when the coolant temperature is less than the second threshold, the low-temperature thermostat diverts the coolant to the water pump. At this time, the coolant passes through the low-temperature thermostat and the water pump and enters the engine;

[0092] When the coolant temperature is greater than or equal to the second threshold and less than the third threshold, the low-temperature thermostat diverts the coolant to the high-temperature thermostat, which then diverts the coolant to heat the oil supply line, oil return line, and fuel tank. At this time, the coolant passes through the low-temperature thermostat and the high-temperature thermostat, heating the oil supply line, oil return line, and fuel tank, and finally enters the engine through the one-way valve and the water pump;

[0093] When the coolant temperature is greater than or equal to the third threshold, the high-temperature thermostat does not divert the coolant to heat the oil supply line, the oil return line, or the fuel tank, but diverts the coolant to the radiator. At this time, the coolant enters the engine through the low-temperature thermostat, the high-temperature thermostat, the radiator, and the second water pump.

[0094] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0095] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A fuel system low-temperature antifreeze and emission reduction integrated device, used in a vehicle fuel system, the fuel system comprising: A fuel tank (15), a fuel supply line (9), an engine (19), and a fuel return line (18) connected in sequence to the fuel tank (15), an oil pump (12) and a fuel filter (13) arranged on the fuel supply line (9), and an exhaust pipe (7) arranged on the engine (19), the fuel return line (18) also being connected to the fuel tank (15), characterized in that the low-temperature antifreeze and emission reduction integrated device includes a cooling system and a heating system; The cooling system comprises: a low-temperature thermostat (2), a high-temperature thermostat (3), a one-way valve (20) and a water pump (22) connected in sequence via a coolant pipe (23); the coolant pipe (23) is sleeved on the oil supply pipeline (9) and the oil return pipeline (18) to form a sleeve structure; the low-temperature thermostat (2) and the water pump (22) are respectively connected to the engine (19); the low-temperature thermostat (2) and the water pump (22) are connected via a coolant pipe (23); an exhaust gas waste heat recovery device (21) is sleeved on the coolant pipe (23) between the engine (19) and the low-temperature thermostat (2); the coolant pipe (23) between the high-temperature thermostat (3) and the one-way valve (20) is wound around the oil supply pipeline (9) and the oil return pipeline (18); and a radiator (1) connected via the coolant pipe (23) is further provided between the high-temperature thermostat (3) and the water pump (22); The heating system comprises: a thermoelectric device (8), a battery (10), a controller (11) and a heating wire (14) connected in sequence, the heating wire (14) being continuously wound on an oil supply line (9) and an oil return line (18), and the heating wire (14) being located between the coolant pipe (23) and the oil supply line (9) and the oil return line (18), a heat storage material (16) being filled between the coolant pipe (23) and the heating wire (14), the heat storage material (16) being a phase change heat storage material or a non-phase change heat storage material, a three-way valve (6) being provided on the exhaust pipe (7), and the three-way valve (6) being connected to the engine (19), the exhaust waste heat recovery device (21) and the thermoelectric device (8) respectively; The oil supply pipeline (9) extends into the oil tank (15) and is spirally arranged in the oil tank (15).

2. The low-temperature antifreeze and emission reduction integrated device for a fuel system according to claim 1, characterized in that: The coolant pipe (23) between the high-temperature thermostat (3) and the one-way valve (20) passes through the interior of the oil tank (15).

3. The low-temperature antifreeze and emission reduction integrated device for a fuel system according to claim 1, characterized in that: The exhaust gas waste heat recovery device (21) surrounds the coolant pipe (23), and the coolant pipe (23) is spirally arranged inside the exhaust gas waste heat recovery device (21).

4. The integrated low-temperature antifreeze and emission reduction device for a fuel system according to claim 3, characterized in that: A baffle (5) for limiting an exhaust gas path is provided in the exhaust gas waste heat recovery device (21); and fins (4) are provided on the coolant pipe (23) in the exhaust gas waste heat recovery device (21).

5. The antifreeze method of the low-temperature antifreeze and emission reduction integrated device for a fuel system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Before starting the vehicle, determine whether the fuel temperature is less than a first threshold value; if the fuel temperature is less than the first threshold value, heat the fuel supply pipeline (9) and the fuel return pipeline (18) through the heating wire (14) to thaw the fuel, and the heating wire (14) no longer heats the fuel after the fuel is thawed; Step 2: When the fuel temperature is greater than or equal to the first threshold, the vehicle is started, and at this time, it is determined whether the coolant temperature is less than the second threshold; if it is less than the second threshold, the coolant needs to be heated, and the exhaust gas waste heat recovery device (21) collects the exhaust gas waste heat to heat the coolant pipe (23); otherwise, no operation is performed; Step 3: When the coolant temperature is greater than or equal to the second threshold, the exhaust gas waste heat recovery device (21) is closed, and the coolant is diverted for the first time using the low-temperature thermostat (2) and the high-temperature thermostat (3), and the coolant diverted for the first time is used to heat the oil supply pipeline (9) and the oil return pipeline (18); at the same time, the thermoelectric device (8) collects the exhaust gas waste heat to generate electricity and stores it in the battery (10); Step 4: When the coolant temperature rises, it is determined whether the coolant temperature is greater than or equal to a third threshold value; if it is greater than or equal to the third threshold value, the coolant needs to be dissipated, and at this time, the coolant is diverted a second time using the low-temperature thermostat (2) and the high-temperature thermostat (3) on the basis of the first diversion, and the coolant diverted for the second time is dissipated through the radiator (1); otherwise, no operation is performed; Step 5, determining whether the coolant temperature is greater than or equal to a fourth threshold value. If the coolant temperature is greater than or equal to the fourth threshold value, the high-temperature thermostat (3) closes the passage of the coolant pipe (23) between the high-temperature thermostat (3) and the one-way valve (20); otherwise, no operation is performed. Among them, the first threshold is the freezing temperature of fuel + 5 degrees Celsius, the second threshold is between 70 degrees Celsius and 80 degrees Celsius, the third threshold is between 85 degrees Celsius and 90 degrees Celsius, and the fourth threshold is between 95 degrees Celsius and 100 degrees Celsius.

6. The antifreeze method according to claim 5, characterized in that: The coolant pipe (23) between the high-temperature thermostat (3) and the one-way valve (20) passes through the interior of the oil tank (15) and heats the oil tank (15) through the coolant.

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