Cold start circulating system in ultralow temperature environment

Abstract

The invention discloses a cold start circulating system in an ultralow-temperature environment, and belongs to the technical field of engine low-temperature start. The starting circulation system is composed of the four independent subsystems of the engine water path circulation system, the storage battery heat preservation system, the fuel oil heater system and the fuel oil preheating system, and the engine water path circulation system is used for improving the preheating efficiency of warm air to an engine cylinder body under the ultralow temperature condition; therefore, the efficiency of heating an engine cylinder body and engine oil by the anti-freezing solution heated by the heater is improved; the storage battery heat preservation system is used for heating and preserving heat to maintain the activity of the storage battery electrolyte in an ultralow-temperature environment; the fuel oil heater system achieves rapid ignition of fuel oil through three-stage preheating and atomization injection, the fuel oil preheating system guarantees smoothness of a low-temperature oil way through active preheating, when the four independent subsystems work cooperatively, the voltage of a storage battery is stabilized at 27 V at the temperature of-40 DEG C, a fuel oil heater is started within 92 seconds, and the water temperature of an engine rises to 80 DEG C within 17 minutes.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature starting of engines, and in particular to a cold starting circulation system in an ultra-low temperature environment. Background Art

[0002] The ultra-low temperature starting performance of fuel buses is one of the important indicators to ensure the normal use of the vehicle in ultra-low temperature conditions of -40℃. The bus markets in extremely cold regions at home and abroad have high requirements for the low temperature starting performance in ultra-low temperature conditions.

[0003] In extremely cold regions (such as -40°C), fuel engines face problems such as battery voltage attenuation, reduced fuel fluidity, and increased oil viscosity, resulting in a high cold start failure rate. In the existing technology, a single preheating solution (such as glow plugs or battery insulation) is difficult to fully solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a cold start circulation system in an ultra-low temperature environment, which can at least solve one of the problems faced by fuel engines in the single preheating scheme in the prior art, such as battery voltage attenuation, reduced fuel fluidity, and increased oil viscosity.

[0005] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0006] A cold start circulation system for an ultra-low temperature environment comprises four independent subsystems, which are an engine water circulation system, a battery insulation system, a fuel heater system and a fuel preheating system. The engine water circulation system is used to improve the efficiency of warm air preheating an engine cylinder under ultra-low temperature conditions, thereby improving the efficiency of antifreeze heated by the heater in heating the engine cylinder and engine oil; the battery insulation system is used to heat and insulate to maintain the activity of battery electrolyte in an ultra-low temperature environment; the fuel heater system realizes rapid ignition of fuel through three-stage preheating and atomized injection, and the fuel preheating system ensures smooth low-temperature oil circuits through active preheating.

[0007] As a further solution of the present invention: the engine water circulation system includes a closed-loop water circuit consisting of an engine body, a water pump, a water channel, a butterfly valve group and connecting pipes. The small circulation path is controlled by the butterfly valve group to enable the antifreeze to quickly heat the engine body and the engine oil.

[0008] As a further solution of the present invention: the connecting pipeline includes a warm air water intake, a body end water intake, a warm air water inlet, a urea water inlet and a warm air return water inlet, wherein the warm air water intake is connected to the engine warm air water outlet through a clamp, and is connected to the warm air water inlet through a hose, and is connected to the engine end water intake on a branch road to form an engine preheating small cycle, the engine preheating small cycle is connected in parallel to the warm air water inlet through a hose, the urea water inlet is connected to the body end water intake, and the warm air return water inlet is connected to the engine water inlet.

[0009] As a further solution of the present invention: the butterfly valve group includes butterfly valve 1, urea water intake butterfly valve, warm air water inlet valve, engine preheating butterfly valve and warm air return water butterfly valve; wherein butterfly valve 1 is arranged between the warm air water intake port and the water intake port at the end of the body, the urea water intake butterfly valve is arranged between the warm air water intake port and the urea water inlet port, the warm air water inlet valve is arranged on the warm air water intake port, the engine preheating butterfly valve is connected to the engine water return port, and the warm air return water butterfly valve is connected to the warm air return port.

[0010] As a further solution of the present invention: the battery insulation system includes an air heater, a low-temperature battery, a cover and a control harness 1, the control harness 1 is electrically connected to the low-temperature battery, the low-temperature battery is arranged in the cover, and the air heater is arranged on the cover.

[0011] As a further solution of the present invention: the air heater is connected to the interior of the casing through an air duct, and a heat-insulating material is also provided on the inner wall of the casing.

[0012] As a further solution of the present invention: the fuel heater system includes a control harness 2, a fine filter 1, a control box, a warm air water intake valve and a valve 2, the control harness 2 is electrically connected to the heater body, the fine filter and the control box are connected to the heater body, and the warm air water intake valve and the valve 2 are respectively connected between the heater body and the engine water circulation system.

[0013] As a further solution of the present invention: the fuel preheating system includes a fuel tank, a preheating oil suction pan, a preheating oil suction pipe 1, a coarse filter preheating flange, a preheating oil suction pipe 2 and a fine filter 2, the preheating oil suction pan is arranged in the fuel tank, the preheating oil suction pipe 1 and the preheating oil suction pipe 2 are connected to the coarse filter and the fine filter 2 respectively, and the coarse filter preheating flange is arranged on the coarse filter element.

[0014] As a further solution of the present invention: the fuel preheating system detects the ambient temperature through a temperature sensor, and automatically or forcibly starts the preheating oil suction plate, preheating oil suction pipe 1 and preheating oil suction pipe 2 through a control switch.

[0015] As a further solution of the present invention: when the four independent subsystems work together, the battery voltage is stabilized at 27V at -40°C, the fuel heater starts within 92 seconds, and the engine water temperature rises to 80°C within 17 minutes.

[0016] Beneficial effects of the present invention:

[0017] The invention comprises a starting circulation system composed of four independent subsystems, namely, an engine water circulation system, a battery heat preservation system, a fuel heater system and a fuel preheating system. The engine water circulation system is used for improving the efficiency of preheating the engine cylinder body by warm air under ultra-low temperature conditions, thereby improving the efficiency of the antifreeze heated by the heater in heating the engine cylinder body and the engine oil; the battery heat preservation system is used for heating and heat preservation to maintain the activity of the battery electrolyte in an ultra-low temperature environment; the fuel heater system realizes rapid ignition of the fuel through three-stage preheating and atomizing injection, and the fuel preheating system ensures smooth low-temperature oil circuits through active preheating. When the four independent subsystems work in coordination, the battery voltage is stabilized at 27V at -40°C, the fuel heater is started within 92 seconds, and the engine water temperature rises to 80°C within 17 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of a cold start cycle system in an ultra-low temperature environment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the engine water circulation system of the present invention;

[0021] Figure 3 It is a schematic structural diagram of a battery heat preservation system of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the fuel heater system of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the fuel preheating system of the present invention.

[0024] In the figure: 1. Warm air water inlet; 2. Butterfly valve 1; 3. Water inlet at the end of the body; 4. Urea water intake butterfly valve; 5. Warm air water inlet; 6. Warm air water inlet valve; 7. Engine preheating butterfly valve; 8. Urea water inlet; 9. Warm air return water butterfly valve; 10. Warm air return water inlet; 11. Air heater; 12. Air duct; 13. Low-temperature battery; 14. Cover; 15. Insulation material; 16. Control harness 1; 17. Control harness 2; 18. Fine filter 1; 19. Control box; 20. Warm air water intake valve; 21. Valve 2; 22. Fuel tank; 23. Preheating oil suction plate; 24. Preheating oil suction pipe 1; 25. Coarse filter preheating flange; 26. Preheating oil suction pipe 2; 27. Fine filter 2: 28. Coarse filter. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that terms such as "up", "down", "left", "right", "front" and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they should not be understood as limitations on the present invention.

[0027] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1-5 As shown, an embodiment of the present invention provides a cold start circulation system for an ultra-low temperature environment, comprising four independent subsystems, namely an engine water circulation system, a battery insulation system, a fuel heater system and a fuel preheating system, wherein the engine water circulation system is used to improve the efficiency of warm air preheating the engine cylinder under ultra-low temperature conditions, thereby improving the efficiency of the antifreeze heated by the heater to heat the engine cylinder and the engine oil; the battery insulation system is used to heat and insulate to maintain the activity of the battery electrolyte in an ultra-low temperature environment; the fuel heater system realizes rapid ignition of the fuel through three-stage preheating and atomization injection, and the fuel preheating system ensures smooth low-temperature oil circuits through active preheating.

[0029] Among them, the engine water circulation system includes a closed-loop water circuit consisting of an engine body, a water pump, a water channel, a butterfly valve group and connecting pipes. The small circulation path is controlled by the butterfly valve group to enable the antifreeze to quickly heat the engine body and the engine oil.

[0030] See also Figure 2As shown, the connecting pipeline includes a warm air water intake port 1, a machine body end water intake port 3, a warm air water inlet port 5, a urea water inlet port 8 and a warm air return water port 10, wherein the warm air water intake port 1 is connected to the engine warm air water outlet through a clamp, and is connected to the warm air water inlet port 5 through a hose, and is connected to the engine end water intake port on a branch line to form an engine preheating small cycle, the engine preheating small cycle is connected in parallel to the warm air water inlet port 5 through a hose, the urea water inlet port 8 is connected to the machine body end water intake port 3, and the warm air return water port 10 is connected to the engine water inlet port. The butterfly valve group includes a butterfly valve 2, a urea water intake butterfly valve 4, a warm air water inlet valve 6, an engine preheating butterfly valve 7 and a warm air return water butterfly valve 9; wherein the butterfly valve 2 is arranged between the warm air water intake port 1 and the water intake port 3 at the end of the machine body, the urea water intake butterfly valve 4 is arranged between the warm air water intake port 1 and the urea water inlet port 8, the warm air water inlet valve 6 is arranged on the warm air water intake port 1, the engine preheating butterfly valve 7 is connected to the engine water return port, and the warm air return water butterfly valve 9 is connected to the warm air return water port 10.

[0031] The warm air water intake port 1 is connected to the engine warm air outlet through a clamp, and is connected to the warm air water inlet 5 through a butterfly valve 2 and a hose, and is heated by the heater. At the same time, this branch is connected to the engine end water intake port, and the urea water intake butterfly valve 4 forms an engine preheating small cycle, which is connected in parallel to the warm air water inlet 5 through a hose. After being heated inside the heater, one path of hot water is introduced into the whole vehicle warm air, and the other path of hot water flows into the engine return water port through the engine preheating butterfly valve 7. The whole vehicle warm air controls the separate water path of large and small cycles through the butterfly valve, and at the same time returns to the engine water inlet through the warm air return water port 10.

[0032] The engine body's integrated water pump is connected to the internal water channel, and is connected to the external fuel heater water channel through hoses, stainless steel pipes, and clamps to form a closed-loop water channel. Some branches in the water channel are added with control butterfly valve groups. By controlling the on-off of the butterfly valve group, the water channel can form two closed loops, one of which is the normal vehicle warm water circulation diagram. The water circulation is controlled by the butterfly valve group, so that the vehicle water channel forms a water circulation formed only at the front and rear ends of the engine cylinder block. In this way, under ultra-low temperature conditions, the warm air can preheat the engine cylinder block with the fastest efficiency, so that the antifreeze heated by the heater can quickly heat the engine cylinder block and engine oil.

[0033] See also Figure 3 As shown, the battery insulation system includes an air heater 11, a low-temperature battery 13, a cover 14 and a control harness 16. The control harness 16 is electrically connected to the low-temperature battery 13. The low-temperature battery 13 is arranged in the cover 14, and the air heater 11 is arranged on the cover 14. The air heater 11 is connected to the inside of the cover 14 through the air duct 12, and a heat preservation material 15 is also arranged on the inner wall of the cover 14. The heat preservation material 15 performs heat preservation treatment on the low-temperature battery 13, and the air heater 11 heats the low-temperature battery 13, so that the low-temperature battery 13 returns to a normal temperature state as soon as possible.

[0034] The battery insulation system forms a closed space between the low-temperature battery 13 and the air heater 11 through the cover 14 and the insulation material 15, starts the air heater 11 through the instrument panel switch, and heats the periphery of the low-temperature battery 13 through the internal air duct 12, so that the low-temperature battery 13 can heat up quickly, activate the activity of the electrolyte, and make the low-temperature battery 13 exert the maximum voltage value.

[0035] See also Figure 4 As shown, the fuel heater system includes a control harness 2 17, a fine filter 18, a control box 19, a warm air water intake valve 20 and a valve 21. The control harness 2 17 is electrically connected to the heater body, the fine filter and the control box 19 are connected to the heater body, and the warm air water intake valve 20 and the valve 2 21 are respectively connected between the heater body and the engine water circulation system.

[0036] See also Figure 5 As shown, the fuel preheating system includes a fuel tank 22, a preheating oil suction pan 23, a preheating oil suction pipe 1 24, a coarse filter preheating flange 25, a preheating oil suction pipe 2 26 and a fine filter 27. The preheating oil suction pan 23 is arranged in the fuel tank 22, the preheating oil suction pipe 1 24 and the preheating oil suction pipe 2 26 are connected to the coarse filter 28 and the fine filter 2 27 in sequence, and the coarse filter preheating flange 25 is arranged on the coarse filter element.

[0037] The fuel preheating system cooperates with the fuel heater system. The fuel preheating system controls the start of the fuel heater through the switch on the instrument panel, preheats the fuel around the oil suction plate of the fuel tank 22 through the electric heating oil pipe, and at the same time, the extracted fuel is atomized by the nozzle and ignited after being preheated by the three-stage filter element, so that the heater is started quickly, so that the antifreeze passing through the heater is quickly heated;

[0038] The fuel heater system senses the outside temperature through a temperature sensor, or is turned on by a forced switch to preheat the pipeline. It mainly preheats the oil circuit by heating the oil absorption plate inside the fuel tank 22, heating the oil pipe with a resistance wire, and preheating the flange 25 of the coarse filter, thereby improving the atomization of the fuel in the cylinder body, thereby ensuring smooth compression ignition of the fuel and starting of the engine at low temperatures.

[0039] The present invention ensures that the battery has sufficient power by innovatively designing the battery heating system and heating and heat-insulating the battery; innovatively tackles the ultra-low temperature starting performance of the fuel heater and innovatively designs three-stage preheating, namely, oil pipe heating, oil filter heating and fuel injector heating, to ensure that the fuel circuit of the fuel heater is unobstructed and the oil temperature is high and easy to ignite, thereby realizing fast, stable and effective operation of the heater. At the same time, innovative design is made for the fuel heater fuel injector structure to improve ignition efficiency and combustion efficiency; innovative design is made for engine water circuit preheating, the water circuit is heated by the fuel heater, the water circuit is optimized by optimizing the water circuit layout, and the water ports at the front and rear ends of the engine are used to form a small circulation system according to the characteristics of the engine water circuit structure, so that the shortest water circuit of the heater preheating circuit covers the entire engine body, thereby quickly realizing preheating of the engine body.

[0040] In the ultra-low temperature environment of -40℃, after all systems were working, the battery voltage on the instrument displayed 27V and always maintained at this value, indicating that the innovative design of the battery heating and insulation system is effective and can ensure the battery voltage value under ultra-low temperature conditions; open the small circulation valve for engine water circuit preheating, turn on the water pump and fuel heater switch, and at the 92nd second, the fuel heater successfully started and achieved stable combustion, indicating that the innovative design around the fuel heater, including the three-stage preheating and the innovative design of the injector structure, is also effective, which can achieve fast, stable and efficient operation of the fuel heater. At the 17th minute, the instrument showed that the engine water temperature had reached 80℃, indicating that the innovative design of the engine water circuit preheating is effective. At the 18th minute, the water temperature further rose to the peak, the thermostat opened, and the bus cooling system started to work. At this time, the water temperature dropped significantly, which also verified that the design scheme is reliable and stable in the ultra-low temperature environment of -40℃ for the cold start of the bus.

[0041] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A cold start cycle system in an ultra-low temperature environment, characterized in that: It includes four independent subsystems, namely the engine water circulation system, the battery insulation system, the fuel heater system and the fuel preheating system. The engine water circulation system is used to improve the efficiency of warm air preheating the engine cylinder under ultra-low temperature conditions, thereby improving the efficiency of the antifreeze heated by the heater to heat the engine cylinder and the engine oil; the battery insulation system is used to heat and insulate to maintain the activity of the battery electrolyte in an ultra-low temperature environment; the fuel heater system realizes rapid ignition of the fuel through three-stage preheating and atomized injection, and the fuel preheating system ensures the smoothness of the low-temperature oil circuit through active preheating.

2. The cold start circulation system in an ultra-low temperature environment according to claim 1, characterized in that: The engine water circulation system includes a closed-loop water circuit consisting of an engine body, a water pump, a water channel, a butterfly valve group and connecting pipes. The small circulation path is controlled by the butterfly valve group to enable the antifreeze to quickly heat the engine body and the engine oil.

3. The cold start circulation system in an ultra-low temperature environment according to claim 2, characterized in that: The connecting pipeline includes a warm air water intake, a machine body end water intake, a warm air water inlet, a urea water inlet and a warm air return water inlet, wherein the warm air water intake is connected to the engine warm air water outlet through a clamp, and is connected to the warm air water inlet through a hose, and is connected to the engine end water intake on a branch line to form an engine preheating small cycle, the engine preheating small cycle is connected in parallel to the warm air water inlet through a hose, the urea water inlet is connected to the machine body end water intake, and the warm air return water inlet is connected to the engine water inlet.

4. The cold start circulation system in an ultra-low temperature environment according to claim 3, characterized in that: The butterfly valve group includes butterfly valve 1, urea water intake butterfly valve, warm air water inlet valve, engine preheating butterfly valve and warm air return water butterfly valve; wherein butterfly valve 1 is arranged between the warm air water intake port and the water intake port at the end of the body, the urea water intake butterfly valve is arranged between the warm air water intake port and the urea water inlet port, the warm air inlet valve is arranged on the warm air water intake port, the engine preheating butterfly valve is connected to the engine water return port, and the warm air return water butterfly valve is connected to the warm air return port.

5. The cold start circulation system in an ultra-low temperature environment according to claim 1, characterized in that: The battery insulation system includes an air heater, a low-temperature battery, a cover and a control harness 1, wherein the control harness 1 is electrically connected to the low-temperature battery, the low-temperature battery is arranged in the cover, and the air heater is arranged on the cover.

6. The cold start circulation system in an ultra-low temperature environment according to claim 5, characterized in that: The air heater is connected to the interior of the housing through an air duct, and a heat-insulating material is provided on the inner wall of the housing.

7. The cold start circulation system in an ultra-low temperature environment according to claim 1, characterized in that: The fuel heater system includes a control harness 2, a fine filter 1, a control box, a warm air water intake valve and a valve 2. The control harness 2 is electrically connected to the heater body, the fine filter and the control box are connected to the heater body, and the warm air water intake valve and the valve 2 are respectively connected between the heater body and the engine water circulation system.

8. The cold start circulation system in an ultra-low temperature environment according to claim 7, characterized in that: The fuel preheating system includes a fuel tank, a preheating oil suction pan, a preheating oil suction pipe 1, a coarse filter preheating flange, a preheating oil suction pipe 2 and a fine filter 2. The preheating oil suction pan is arranged in the fuel tank. The preheating oil suction pipe 1 and the preheating oil suction pipe 2 are connected to the coarse filter and the fine filter 2 in sequence. The coarse filter preheating flange is arranged on the coarse filter element.

9. The cold start circulation system in an ultra-low temperature environment according to claim 8, characterized in that: The fuel preheating system detects the ambient temperature through a temperature sensor, and automatically or forcibly starts the preheating oil suction plate, the preheating oil suction pipe 1 and the preheating oil suction pipe 2 through a control switch.

10. The cold start circulation system in an ultra-low temperature environment according to claim 1, characterized in that: When the four independent subsystems work together, the battery voltage is stabilized at 27V at -40℃, the fuel heater starts within 92 seconds, and the engine water temperature rises to 80℃ within 17 minutes.

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