Heat collection type diesel engine fuel preheating system

Abstract

The invention discloses a heat collection type diesel engine fuel preheating system. The preheating system comprises a heating pot and a heat collection type fuel pump. An oil inlet of the heat collection type fuel oil pump is communicated with an engine fuel oil tank, an oil outlet of the heat collection type fuel oil pump is communicated with the heating pot and an oil inlet of the engine fuel oil supply system, and the heat collection type fuel oil pump is used for conveying fuel oil in the engine fuel oil tank to the heating pot and the engine fuel oil supply system and heating the conveyed fuel oil; and the heating pot and an oil return port of the engine fuel oil supply system are both communicated with the engine fuel oil tank. According to the preheating system, pumped fuel oil is instantly heated under the cold start working condition, so that preheating of fuel oil for an engine fuel oil supply system and a heating pot is achieved, and therefore the cold start performance of the diesel engine is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of diesel engine preheating, and particularly relates to a heat collection type diesel engine fuel preheating system. BACKGROUND

[0002] The diesel engine is widely applied to the power machinery field due to its high thermal efficiency and good economy. However, China is vast in territory, and the surface temperature difference is great. In the Qinghai-Tibet Plateau and Daxing'anling regions, the temperature is below 0℃ for a long time within a year, and in some northern regions, the minimum temperature can reach about -50℃. In these extremely cold regions, the diesel engine has the problems of difficult cold start and even cannot start, which seriously affects the daily use of the diesel engine. Therefore, the cold start has become an important index for measuring the diesel engine in the low-temperature environment.

[0003] In the cold start process of the diesel engine, three conditions need to be met to realize the continuous and stable ignition of the cylinder, which are: good atomization of the diesel in the cylinder, sufficient mixing of the atomized diesel and air, and the temperature of the compressed gas reaching the self-ignition temperature of the diesel. In the low-temperature environment, the diesel temperature is low, which increases the viscosity of the diesel. At this time, the diesel injected into the cylinder has poor atomization effect, and under the condition of insufficient diesel atomization, the diesel cannot form small droplets, but exists in the form of large droplets or even liquid column, which cannot be fully mixed with air. In addition, the engine cylinder in the low-temperature environment is also cold. At this time, the compressed air and diesel after mixing cannot reach the self-ignition temperature of the diesel, which finally leads to the problem of difficult ignition of the diesel engine in the low-temperature environment.

[0004] In order to solve the problem that the diesel engine cannot be started smoothly in a low temperature environment, a diesel engine preheating system using a heating pot has been developed in the prior art. The preheating system uses an external fuel heating pot to heat the diesel in the diesel engine fuel tank by extracting the diesel from the fuel tank and burning and heat exchanging in the heating pot. The antifreeze in the engine is pumped to the heating pot by a water pump to circulate and heat the antifreeze, so as to preheat the engine cylinder. After being heated to a certain temperature, the diesel engine is ignited and started. However, when the preheating system is started in a low temperature environment, only the engine cylinder is usually preheated, and the preheating of the oil supply system in the engine, i.e. the engine fuel supply system, is difficult to achieve, so that the entire oil circuit from the inside of the engine oil tank to the engine fuel supply system is at a low temperature, and the temperature of the diesel inside is even lower, which finally leads to insufficient diesel atomization and mixing, causing the engine to be still difficult to start. At the same time, in an extremely low temperature environment, although the oil supply amount of the heating pot device is small and the starting condition is low, the further reduction of the temperature of the diesel will cause a large increase in the viscosity of the diesel, at which time the heating pot system also has the problem of difficult starting, which will further cause the engine to be insufficiently preheated, and finally cause the problem of diesel engine ignition failure and the like.

[0005] Therefore, the present application needs to solve the problems of poor cold start performance of the diesel engine, difficult starting of the traditional auxiliary preheating system and long preheating time in the prior art. SUMMARY

[0006] The present application provides a heat collecting type diesel engine fuel preheating system, which instantaneously heats the pumped fuel in the cold start condition to preheat the engine fuel supply system and the fuel for the heating pot, thereby improving the cold start performance of the diesel engine.

[0007] In order to achieve the above purpose, the present application adopts the following specific technical solutions: The present application provides a heat collecting type diesel engine fuel preheating system, which instantaneously heats the pumped fuel in the cold start condition to preheat the engine fuel supply system and the fuel for the heating pot, thereby improving the cold start performance of the diesel engine. The oil inlet of the heat collecting type fuel pump is in communication with the engine fuel tank, and the oil outlet of the heat collecting type fuel pump is in communication with the oil inlet of the heating pot and the engine fuel supply system. The heat collecting type fuel pump is used to deliver the fuel in the engine fuel tank to the heating pot and the engine fuel supply system, and heat the delivered fuel. The oil return of the heating pot and the engine fuel supply system is in communication with the engine fuel tank.

[0008] Further, the heat collecting type fuel pump is composed of an electric fuel pump and an instant heating type electric heating body. The electric fuel pump is connected between the engine fuel tank and the instant heating electric heating body, for pumping the fuel in the engine fuel tank to the instant heating electric heating body; The oil outlet of the instant heating electric heating body is communicated with the oil inlet of the warming pot and the engine fuel supply system.

[0009] Further, a cooling liquid circulation passage is formed between the water jacket of the engine and the radiator through an engine water inlet pipe and an engine water outlet pipe; An engine water pump for pumping the cooling liquid to the water jacket is installed in the engine water inlet pipe; A thermostat is installed in the engine water outlet pipe; An engine return pipe is connected between the engine water inlet pipe and the engine water outlet pipe; One end of the engine return pipe is connected between the engine water pump and the radiator, and the other end is communicated with the thermostat; A warming pot water return pipe is connected between the water jacket and the warming pot, and a warming pot water outlet pipe is connected between the warming pot and the engine return pipe.

[0010] Further, the oil outlet of the instant heating electric heating body is communicated with the oil inlet of the warming pot through a warming pot oil conveying pipe, and the oil return port of the warming pot is communicated with the engine fuel tank through a warming pot oil return pipe; The oil outlet of the instant heating electric heating body is communicated with the oil inlet of the engine fuel supply system through an engine oil conveying pipe, and the oil return port of the engine fuel supply system is communicated with the engine fuel tank through an engine oil return pipe.

[0011] Further, the warming pot, the electric fuel pump, the instant heating electric heating body and the engine water pump are all signal connected with the electronic control system of the diesel engine; The electronic control system is used for controlling the warming pot, the electric fuel pump, the instant heating electric heating body and the engine water pump.

[0012] Further, a valve for controlling the flow of the pipes is installed in the warming pot water return pipe, the warming pot water outlet pipe and the warming pot oil conveying pipe; The electronic control system is signal connected with each valve, for controlling the opening degree of each valve.

[0013] Further, a first temperature sensor installed in the engine fuel tank is further included; The first temperature sensor is used for measuring the fuel temperature in the engine fuel tank, and sending the collected fuel temperature signal to the electronic control system.

[0014] Further, a second temperature sensor is installed at the water return port of the warming pot. The second temperature sensor is used to measure the cooling liquid temperature at the water return port of the warming pot and send the collected cooling liquid temperature signal to the electric control system.

[0015] Compared with the prior art, the technical scheme of the present application has the following beneficial effects: The preheating system of the present application adopts a double-heating single-cycle structure, and the added heat collecting fuel pump can directly heat the pre-injection fuel in the engine fuel supply system, so as to improve the atomization performance and mixing degree of the pre-injection fuel at ignition time. Therefore, the direct heating of the pre-injection fuel by the preheating system can indirectly reduce the demand of the engine on the cylinder preheating temperature, so as to reduce the time required for engine preheating and the workload of equipment start-up.

[0016] Meanwhile, the preheating system of the present application is particularly suitable for the cold start process of the engine in an extremely low temperature environment. The fuel delivered to the engine fuel supply system and the warming pot is preheated by the heat collecting fuel pump, which can preheat the fuel required by the traditional warming pot preheating system, so as to improve the reliability of the warming pot start-up and further improve the cold start performance of the engine in an extremely low temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a schematic diagram of the principle structure of the heat collecting diesel engine fuel preheating system of the present application; Figure 2 Fig. 2 is a schematic diagram of the flow direction of the cooling liquid when the heat collecting diesel engine fuel preheating system of the present application does not work in a low temperature environment; Figure 3 Fig. 3 is a schematic diagram of the flow direction of the fuel and the cooling liquid when the heat collecting diesel engine fuel preheating system of the present application works in an extremely low temperature environment.

[0018] Reference signs: 1 - engine water pump, 2 - engine, 3 - thermostat, 4 - engine return pipe, 5 - engine water outlet pipe, 6 - radiator, 7 - engine water inlet pipe, 8 - fan, 11 - engine fuel tank, 12 - heat collecting fuel pump, 13 - warming pot oil delivery pipe, 14 - warming pot, 15 - warming pot water outlet pipe, 16 - warming pot water return pipe, 17 - engine oil delivery pipe, 18 - engine oil return pipe, 19 - warming pot oil return pipe, 20 - electric fuel pump, 21 - instant electric heating body. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0020] Embodiment one The embodiment provides a heat collecting type diesel engine fuel preheating system, which is used for a diesel engine 2. The diesel engine 2 generally has a cylinder body, a cylinder cover, an engine fuel supply system, a thermostat 3, an engine water pump 1 and an electric control system. The diesel engine 2 is matched with an engine fuel tank 11 for providing fuel, a radiator 6 for cooling coolant and a fan 8 for accelerating heat dissipation of the radiator 6. In order to dissipate heat of the cylinder body and the cylinder cover, water jackets for containing coolant are arranged in the cylinder body and the cylinder cover, heat is taken away by circulation of the coolant, and thus the cylinder body and the cylinder cover can work normally. The circulation flow path of the coolant is controlled by the thermostat 3. When the diesel engine 2 is in a low temperature environment, in order to improve cold start performance of the diesel engine 2, a heating pot 14 is used to heat the coolant, the heated coolant circulates between the heating pot 14 and the water jacket, the water jacket is heated, and then the cylinder body and the cylinder cover of the engine 2 are preheated, so that the diesel engine 2 can be started smoothly.

[0021] As shown in Figure 1 The preheating system comprises the heating pot 14 and a heat collecting type fuel pump 12. The heating pot 14 and the heat collecting type fuel pump 12 are signal connected with the electric control system of the diesel engine 2, and the heating pot 14 and the heat collecting type fuel pump 12 are controlled by the electric control system. Wherein: The oil inlet of the heat collecting type fuel pump 12 is communicated with the engine fuel tank 11, and the oil outlet of the heat collecting type fuel pump 12 is communicated with the oil inlet of the heating pot 14 and the engine fuel supply system. The heat collecting type fuel pump 12 is used for delivering fuel in the engine fuel tank 11 to the heating pot 14 and the engine fuel supply system, and heating the delivered fuel. The heat collecting type fuel pump 12 is composed of an electric fuel pump 20 signal connected with the electric control system and an instant electric heating body 21. The electric fuel pump 20 is connected between the engine fuel tank 11 and the instant electric heating body 21, and is used for pumping fuel in the engine fuel tank 11 to the instant electric heating body 21. The electric control system is used for controlling opening and closing and flow of the electric fuel pump 20, and the electric control system is used for controlling opening and closing and power of the instant electric heating body 21. The electric fuel pump 20 and the instant electric heating body 21 can be installed in the engine fuel tank 11.

[0022] The oil outlet of the instant electric heating body 21 is communicated with the oil inlet of the warming pot 14 and the engine fuel supply system, for example, the oil outlet of the instant electric heating body 21 is communicated with the oil inlet of the warming pot 14 through the warming pot oil supply pipe 13, and the oil outlet of the instant electric heating body 21 is communicated with the oil inlet of the engine fuel supply system through the engine oil supply pipe 17. The first valve for controlling the flow rate is installed in the warming pot oil supply pipe 13, and the first valve is signal connected with the electric control system, so that the fuel flow rate into the warming pot 14 can be controlled by controlling the first valve in the warming pot oil supply pipe 13 through the electric control system.

[0023] The oil return port of the warming pot 14 and the engine fuel supply system is communicated with the engine fuel tank 11, for example, the oil return port of the warming pot 14 is directly communicated with the engine fuel tank 11 through the warming pot oil return pipe 19, and the oil return port of the engine fuel supply system is directly communicated with the engine fuel tank 11 through the engine oil return pipe 18.

[0024] The cooling liquid circulation passage is formed between the water jacket of the engine 2 and the radiator 6 through the engine water inlet pipe 7 and the engine water outlet pipe 5, specifically, the water inlet of the water jacket is communicated with the water outlet of the radiator 6 through the engine water inlet pipe 7, and the water outlet of the water jacket is communicated with the water inlet of the radiator 6 through the engine water outlet pipe 5, so that the cooling liquid circulation passage is formed between the water jacket and the radiator 6. The engine water pump 1 signal connected with the electric control system is installed in the engine water inlet pipe 7, and the engine water pump 1 is controlled by the electric control system to pump the cooling liquid to the water jacket, and the electric control system controls the speed and flow rate of the cooling liquid circulation flow through the engine water pump 1.

[0025] The thermostat 3 is installed in the engine water outlet pipe 5. The engine return pipe 4 is connected between the engine water pump 1 and the radiator 6, and the other end of the engine return pipe 4 is communicated with the thermostat 3, so that the circulation flow route of the cooling liquid is controlled through the thermostat 3.

[0026] The warming pot water return pipe 16 is connected between the water jacket and the warming pot 14, so that the cooling liquid in the water jacket can flow back to the warming pot 14 through the warming pot water return pipe 16, and the warming pot water outlet pipe 15 is connected between the warming pot 14 and the engine return pipe 4, so that the cooling liquid heated by the warming pot 14 can flow into the water jacket through the warming pot water outlet pipe 15. The second valve for controlling the flow rate is installed in the warming pot water return pipe 16, and the third valve for controlling the flow rate is installed in the warming pot water outlet pipe 15, and the second valve and the third valve are signal connected with the electric control system, so that the second valve and the third valve can be controlled by the electric control system to control the opening and closing of the cooling liquid flow path between the warming pot 14 and the water jacket, and the second valve and the third valve can also be controlled by the electric control system to control the cooling liquid flow rate between the warming pot 14 and the water jacket.

[0027] In order to facilitate the control of the low temperature starting process of the diesel engine 2, the preheating system further comprises a first temperature sensor installed in the engine fuel tank 11 and a second temperature sensor installed at the backwater port of the warming pot 14; the first temperature sensor installed in the engine fuel tank 11 can measure the fuel temperature in the engine fuel tank 11 and send the fuel temperature signal collected by the first temperature sensor to the electronic control system; the second temperature sensor installed at the backwater port of the warming pot 14 can measure the coolant temperature at the backwater port of the warming pot, i.e. the temperature of the coolant flowing back to the heating pot from the water jacket during the preheating process of the engine 2 using the warming pot 14, and send the coolant temperature signal collected by the second temperature sensor to the electronic control system.

[0028] The preheating system adopts a double-heating single-cycle structure, and the added heat collecting fuel pump 12 can directly heat the pre-injection fuel in the engine fuel supply system to improve the atomization performance and mixing degree of the pre-injection fuel at the time of ignition. Therefore, the direct heating of the pre-injection fuel by the preheating system can indirectly reduce the requirement of the engine 2 for the preheating temperature of the cylinder, thereby reducing the time required for the preheating of the engine 2 and the workload of the equipment starting.

[0029] At the same time, the preheating system is particularly suitable for the cold starting process of the engine 2 in an extremely low temperature environment. The preheating of the fuel delivered to the engine fuel supply system and the warming pot 14 by the heat collecting fuel pump 12 can realize the preheating of the fuel required by the traditional warming pot preheating system, thereby improving the reliability of the starting of the warming pot 14 and further improving the cold starting performance of the engine 2 in an extremely low temperature environment.

[0030] In a lower temperature environment, when the preheating system does not work or is not installed, as shown in Figure 2 When the engine 2 is started in a cold state, the coolant is pumped from the engine water pump 1 to the water jacket in the cylinder and the cylinder head. After passing through the water jacket in the cylinder and the cylinder head, the coolant absorbs heat during the starting process of the engine 2, and its temperature is increased to a certain extent. At this time, the thermostat 3 is in a closed state, and the coolant does not pass through the engine water outlet pipe 5, the radiator 6 and the engine water inlet pipe 7, but directly returns to the engine water pump 1 through the engine backflow pipe 4, continuing the above-mentioned circulation process, which is called a small cycle of the cooling system, to achieve the purpose of rapidly increasing the temperature of the engine 2.

[0031] The core part of the preheating system is the heat collecting fuel pump 12, which is connected by fuel pipeline between the electric fuel pump 20 and the instant heating electric heating body 21. During the preheating process, the two work together. After the preheating is completed, the instant heating electric heating body 21 stops working, and the electric fuel pump 20 continues to pump fuel for the engine fuel supply system inside the engine 2. During the working process, the electric fuel pump 20 only needs to continuously and stably pump fuel for the engine fuel supply system inside the engine 2. In addition, the fuel pumping flow of the electric fuel pump 20 is small, so the instant heating electric heating body 21 can be used to instantaneously heat the fuel in the fuel pipeline of the engine 2. The heat collecting fuel pump 12 has a compact structure, so it can be arranged in the engine fuel tank 11 to directly preheat the low-temperature fuel in the engine fuel tank 11. It can also be arranged outside the engine fuel tank 11 or other suitable positions to shorten the pipeline path of the heated fuel to be pumped, thereby reducing the heat loss of the high-temperature fuel. As shown in Figure 1 The engine fuel tank 11 is connected to the heat collecting fuel pump 12 through the fuel pipeline and continues to be connected to the warming pot 14. The warming pot 14 is also directly connected to the engine fuel tank 11 through the warming pot return pipeline 19. At the same time, the outlet of the heat collecting fuel pump 12 is also connected to the engine fuel supply system inside the engine 2 and is connected to the engine fuel tank 11 through the engine return pipeline 18.

[0032] During the cold start process of the diesel engine 2 in an extremely low temperature environment, the preheating system starts to work, as shown in Figure 3As shown, the thermal fuel pump 12 draws low-temperature fuel from the engine fuel tank 11 and heats it. The electronic control system of the diesel engine 2 calculates the required heating power based on the set temperature and the flow rate of the electric fuel pump 20, and instantly powers the instantaneous electric heater 21. When the fuel flows through the fuel pipe wall heated by the instantaneous electric heater 21, heat energy is instantly transferred to the fuel, bringing it to the target temperature. Part of the heated fuel is pumped to the heating pot 14 through the heating pot fuel supply pipe 13 and the first valve, while the other part is pumped to the engine fuel supply system inside the engine 2 through the engine fuel supply pipe 17. By directly pumping fuel to the engine fuel supply system inside the engine 2, the thermal fuel pump 12 can directly heat the pre-injected fuel of the engine 2, and pump the low-temperature fuel from the original engine fuel supply system back to the engine fuel tank 11 through the engine return fuel pipe 18, thus achieving the preheating of the pre-injected fuel of the engine 2. Similarly, the heated fuel can preheat the fuel in the heating pot 14 to ensure that the heating pot 14 can start normally in extremely low temperature environments. When the heating pot 14 starts normally, the fuel heated by the heat-collecting fuel pump 12 burns in the heating pot 14 and generates heat. At this time, the third valve on the heating pot outlet pipe 15 and the second valve on the heating pot return pipe 16 are opened. At the same time, the circulating water pump in the heating pot 14 starts and pumps the coolant heated in the heating pot 14 to the water jacket in the cylinder block and cylinder head through the heating pot outlet pipe 15. At this time, the thermostat 3 is in the closed state, and the coolant does not pass through the engine return pipe 4 and other parts of the engine cooling system. After the heated coolant has flowed fully through the engine cylinder block, the coolant temperature drops and is pumped back to the heating pot 14 through the heating pot return pipe 16, forming a cycle of coolant heating-preheating cylinder block-return cooling-reheating. When the cylinder block temperature reaches the startable temperature, shut off the heat-collecting oil pump and the heating pot 14, simultaneously close the third valve on the heating pot outlet pipe 15 and the second valve on the heating pot return pipe 16, and start the diesel engine 2. At this time, the cooling system inside the diesel engine remains as follows: Figure 2 As shown in the small loop, when the engine 2 temperature gradually rises to the optimal temperature, the thermostat 3 in the cooling system opens, and the engine 2 cooling system switches to a large loop. The coolant circulates between the water jacket and the radiator 6, thereby cooling the engine 2 to maintain the optimal operating temperature of the engine 2.

[0033] Example 2 This embodiment provides a control method for the above-mentioned heat-collecting diesel engine fuel preheating system, the control method including the following steps: Step 1: Detect the fuel temperature in the engine fuel tank 11. This can be done using a first temperature sensor. T r .

[0034] Step two, compare the detected fuel temperature in step one T r with the first set temperature T 1: When the fuel temperature T r is less than the first set temperature T 1, open the first valve in the oil feeding pipe 13 of the heating pot, the third valve in the water outlet pipe 15 of the heating pot and the second valve in the water return pipe 16 of the heating pot, and start the electric fuel pump 20, the instant heating electric heater 21, the heating pot 14 and the engine water pump 1, heat the fuel delivered to the heating pot 14 and the engine fuel supply system through the instant heating electric heater 21, and at the same time, circulate and heat the coolant in the water jacket through the heating pot 14; when the fuel temperature T r is greater than or equal to the first set temperature T 1, open the first valve in the oil feeding pipe 13 of the heating pot, start the electric fuel pump 20, the heating pot 14 and the engine water pump 1, at this time, no heating of the fuel is needed, only the coolant in the water jacket is heated through the heating pot 14 to preheat the cylinder.

[0035] Step three, detect the temperature of the coolant at the water return port of the heating pot 14 T y The temperature of the coolant at the water return port of the heating pot 14 can be measured by the second temperature sensor installed at the water return port of the heating pot 14, and the temperature of the cylinder during the preheating process is determined by the coolant flowing back to the heating pot 14.

[0036] Step four, compare the detected temperature of the coolant at the water return port of the heating pot 14 in step three T y with the second set temperature T 2: When the coolant temperature T y is greater than or equal to the second set temperature T 2, close the instant heating electric heater 21, the heating pot 14, the third valve in the water outlet pipe 15 of the heating pot, the second valve in the water return pipe 16 of the heating pot and the first valve in the oil feeding pipe 13 of the heating pot, and start the engine 2; when the coolant temperature T y is less than the second set temperature T 2, return to step three to continue detecting the temperature of the coolant at the water return port of the heating pot 14 until the coolant temperature T y is greater than or equal to the second set temperature T 2, then start the engine 2 to end.

[0037] The control method is used for preheating system to control the cold start process of the diesel engine 2 in an extremely low temperature environment. In the working condition of the cold start of the engine 2, the fuel temperature in the engine fuel tank 11 is first detected, and the preheating system starts to work only when the fuel temperature is lower than a first set temperature. When the fuel temperature in the engine fuel tank 11 is lower than the first set temperature, the heating function of the heat collecting fuel pump 12 is started by automatic control or manual control in the program of the electronic control system, the preheating system starts to pump and heat the low temperature fuel in the engine fuel tank 11, and then the heated fuel is pumped to the warming pot 14, the warming pot 14 is controlled to operate, and the circulating water pump in the warming pot 14 is opened to start the circulation of the cooling liquid of the engine 2, and the engine 2 cylinder is preheated in the process of the circulation of the cooling liquid. During the preheating, the temperature of the cooling liquid at the return water inlet of the warming pot is monitored, and when the temperature of the cooling liquid is greater than a second set temperature, it is proved that the cylinder temperature of the engine 2 has reached the startable temperature, the first valve on the warming pot oil supply pipe 13 and the heating function of the heat collecting fuel pump 12 are closed, and at this time, the normal start program of the engine 2 can be entered. The first set temperature for starting the preheating system and the second set temperature for controlling the preheating system to be closed can be automatically controlled by the program according to the external environment parameters, or can be determined by the operator according to the experimental results or experience of the cold start of the engine 2.

[0038] By the above preheating system, the cylinder of the diesel engine 2 and the pre-injection fuel in the fuel supply system of the engine are heated, and when the engine 2 is in an extremely low temperature environment, the fuel in the fuel supply system of the engine is first preheated to improve the fuel temperature in the pipeline, and further improve the problems of insufficient diesel atomization and insufficient mixing in the cold start process of the engine 2. At the same time, when the engine preheating system starts, the heated fuel can improve the start reliability of the key component-warming pot 14 in the engine preheating system, so that the cylinder temperature of the engine 2 can be rapidly improved in the cold start process of the engine 2 in an extremely low temperature environment, and finally the cold start performance of the engine 2 is improved, and the working environment adaptation range of the diesel engine 2 is further expanded.

[0039] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

[0040] In conclusion, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heat-collecting diesel engine fuel preheating system, characterized in that, Including a heating pot and a heat-collecting fuel pump; The inlet of the heat-collecting fuel pump is connected to the engine fuel tank, and the outlet of the heat-collecting fuel pump is connected to the inlet of the heating pot and the engine fuel supply system. The heat-collecting fuel pump is used to transport fuel from the engine fuel tank to the heating pot and the engine fuel supply system, and to heat the transported fuel. The heating pot and the return port of the engine fuel supply system are both connected to the engine fuel tank.

2. The preheating system as described in claim 1, characterized in that, The heat-collecting fuel pump consists of an electric fuel pump and an instantaneous electric heating element. The electric fuel pump is connected between the engine fuel tank and the instantaneous electric heater, and is used to pump fuel from the engine fuel tank to the instantaneous electric heater. The oil outlet of the instantaneous electric heater is connected to the oil inlet of the heating pot and the engine fuel supply system.

3. The preheating system as described in claim 2, characterized in that, The engine's water jacket and radiator form a coolant circulation path through the engine inlet pipe and engine outlet pipe. An engine water pump is installed in the engine water inlet pipe to pump coolant to the water jacket. A thermostat is installed in the engine water outlet pipe; An engine return pipe is connected between the engine inlet pipe and the engine outlet pipe; One end of the engine return pipe is connected between the engine water pump and the radiator, and the other end is connected to the thermostat. A heating pot return water pipe is connected between the water jacket and the heating pot; a heating pot outlet water pipe is connected between the heating pot and the engine return pipe.

4. The preheating system as described in claim 3, characterized in that, The oil outlet of the instantaneous electric heater is connected to the oil inlet of the heating pot through the heating pot oil supply pipe; the oil return port of the heating pot is connected to the engine fuel tank through the heating pot oil return pipe. The oil outlet of the instantaneous electric heater is connected to the oil inlet of the engine fuel supply system via the engine fuel supply pipe; the oil return port of the engine fuel supply system is connected to the engine fuel tank via the engine return pipe.

5. The preheating system as described in claim 4, characterized in that, The heating pot, the electric fuel pump, the instantaneous electric heater, and the engine water pump are all connected to the electronic control system of the diesel engine. The electronic control system is used to control the heating pot, the electric fuel pump, the instantaneous electric heater, and the engine water pump.

6. The preheating system as described in claim 5, characterized in that, The heating boiler return water pipe, the heating boiler outlet water pipe, and the heating boiler oil supply pipe are all equipped with valves for controlling the flow rate of the pipelines; The electronic control system is connected to the signals of each valve and is used to control the opening degree of each valve.

7. The preheating system according to any one of claims 1-6, characterized in that, It also includes a first temperature sensor installed inside the engine fuel tank; The first temperature sensor is used to measure the fuel temperature in the engine fuel tank and send the collected fuel temperature signal to the electronic control system.

8. The preheating system as described in claim 7, characterized in that, It also includes a second temperature sensor installed at the return water inlet of the heating pot; The second temperature sensor is used to measure the temperature of the coolant at the return water inlet of the heating pot and send the collected coolant temperature signal to the electronic control system.

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