A high-power fan cooling system for a diesel engine adapted to low-temperature environments

Abstract

The present invention discloses a high-power fan cooling system for a diesel engine adapted to low-temperature environments, comprising a radiator and a fan. The fan is arranged on one side of the radiator. The interior of the radiator includes a low-temperature water heat dissipation unit and a high-temperature water heat dissipation unit. High-temperature and low-temperature water circulation pipelines are respectively arranged outside the radiator. The high-temperature water circulation pipeline includes a high-temperature water pump, an oil cooler, and a high-temperature water thermostat. One end of the high-temperature water pump is connected to the high-temperature water heat dissipation unit, the other end of the high-temperature water pump is connected to the oil cooler, one end of the oil cooler is connected to the diesel engine, and the output pipeline of the diesel engine is connected to the high-temperature water thermostat. This high-power fan cooling system for a diesel engine adapted to low-temperature environments can achieve the functions of rapid start-up, rapid loading, variable fan speed, and variable fuel injection advance angle in low-temperature environments of the diesel engine, improving the economic efficiency of the use of the diesel engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a high-power fan cooling system for a diesel engine adapted to low-temperature environments. Background Art

[0002] For high-power diesel engines cooled by fan radiators, the radiator is divided into two heat dissipation units: high-temperature water and low-temperature water. The fan of the radiator is driven by a diesel engine pulley through a belt, and the speed of the fan is proportional to the rotational speed of the diesel engine. The conventional air-cooled diesel engine cooling system has the following problems when operating in low-temperature environments: (1) The fan radiator is designed based on the highest temperature. When operating in low-temperature environments, the cooling effect of the fan remains unchanged, and there is a risk of overcooling for the diesel engine; (2) The power consumption of the diesel engine fan is high when operating at low loads and high speeds in low-temperature environments; (3) After the diesel engine starts, due to the small load and high fan speed, the temperature rise of diesel-cooled water is slow, affecting the loading speed of the diesel engine; (4) The overcooled intake air causes incomplete combustion of the diesel engine, resulting in white smoke from the diesel engine; (5) The excessive fan speed leads to an increase in the power consumption of the diesel engine, affecting the economy of the diesel engine; (6) The high viscosity of the engine oil in low-temperature environments makes starting difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a high-power fan cooling system for a diesel engine adapted to low-temperature environments, realizing the functions of rapid start-up, rapid loading, variable fan speed, and variable fuel injection advance angle for the diesel engine in low-temperature environments, and effectively solving the problems in the background art.

[0004] To achieve the above object, the present invention provides the following technical solution: A high-power fan cooling system for a diesel engine adapted to low-temperature environments, including a radiator and a fan. The fan is arranged on one side of the radiator. The interior of the radiator includes a low-temperature water heat dissipation unit and a high-temperature water heat dissipation unit. High-temperature water circulation pipelines and low-temperature water circulation pipelines are respectively arranged outside the radiator;

[0005] The high-temperature water circulation pipeline includes a high-temperature water pump, an oil cooler, and a high-temperature water thermostat. One end of the high-temperature water pump is connected to the high-temperature water heat dissipation unit, and the other end of the high-temperature water pump is connected to the oil cooler. One end of the oil cooler is connected to the diesel engine, the output pipeline of the diesel engine is connected to the high-temperature water thermostat, one end of the high-temperature water thermostat is connected to the high-temperature water heat dissipation unit, and there is a pipeline between the high-temperature water thermostat and the high-temperature water pump. A fuel boiler preheater is connected in parallel outside the high-temperature water circulation pipeline. The fuel boiler preheater is respectively connected to the pipeline between the high-temperature water thermostat and the high-temperature water pump, the pipeline between the high-temperature water pump and the oil cooler, and the oil sump. The output pipeline of the oil sump is connected to the oil cooler;

[0006] The low-temperature water circulation pipeline includes a low-temperature water pump, an air cooler, and a low-temperature water thermostat. One end of the low-temperature water pump is connected to the low-temperature water cooling unit, the other end of the low-temperature water pump is connected to the air cooler, one end of the air cooler is connected to the low-temperature water thermostat, one end of the low-temperature water thermostat is connected to the low-temperature water cooling unit, and a pipeline is provided between the low-temperature water thermostat and the low-temperature water pump;

[0007] It further includes a control system for controlling the fan speed.

[0008] As a preferred technical solution of the present invention, an oil pre-feed pump is provided between the output pipeline of the oil pan and the oil cooler.

[0009] As a preferred technical solution of the present invention, a check valve is provided on the pipeline between the high-temperature water pump and the oil cooler.

[0010] As a preferred technical solution of the present invention, the control system includes a diesel engine ECU, a fan clutch, a high-temperature water temperature sensor, a low-temperature water temperature sensor, a starting motor, and an ambient temperature sensor. The fan clutch is connected to the fan. The high-temperature water temperature sensor is arranged on the pipeline between the high-temperature water thermostat and the high-temperature water cooling unit. The low-temperature water temperature sensor is arranged on the pipeline between the low-temperature water cooling unit and the low-temperature water pump. The starting motor is connected to the diesel engine. The ambient temperature sensor is arranged inside the diesel engine. The input end of the diesel engine ECU is electrically connected to the output ends of the low-temperature water temperature sensor, the high-temperature water temperature sensor, and the ambient temperature sensor respectively. The output end of the diesel engine ECU is electrically connected to the input ends of the fan clutch, the oil pre-feed pump, the fuel boiler preheater, and the starting motor respectively.

[0011] As a preferred technical solution of the present invention, a solenoid valve and a speed sensor are arranged inside the fan clutch. The output end of the speed sensor is electrically connected to the input end of the diesel engine ECU. The output end of the diesel engine ECU is electrically connected to the input end of the solenoid valve.

[0012] As a preferred technical solution of the present invention, the interior of the fuel boiler preheater includes a circulation pump, an igniter, and a heater.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The high-power fan cooling system for a diesel engine adapted to low-temperature environments heats the high-temperature water in the diesel engine through a fuel boiler preheater, and the fuel boiler preheater heats the oil pan. When the high-temperature water or the intake air temperature meets the starting requirements, the diesel engine can start, avoiding the risk of overcooling during the operation of the diesel engine. At the same time, it increases the heating rate of the cooling water, increases the loading rate of the diesel engine, reduces the oil viscosity, enables the diesel engine to burn fully, and facilitates starting. By setting a diesel engine ECU, it is convenient to adjust the rotation speed of the fan according to the temperature of the diesel engine, reducing power loss and improving the economic performance of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic diagram of the control system of the present invention.

[0016] In the figure: 1 radiator, 2 fan, 3 fan clutch, 4 high-temperature water temperature sensor, 5 high-temperature water thermostat, 6 oil pan, 7 fuel boiler preheater, 8 oil pre-supply pump, 9 oil cooler, 10 check valve, 11 high-temperature water pump, 12 air cooler, 13 low-temperature water thermostat, 14 low-temperature water pump, 15 low-temperature water temperature sensor, 16 ambient temperature sensor, 17 starting motor, 18 diesel engine ECU. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1-2 , the present invention provides a technical solution: A high-power fan cooling system for a diesel engine adapted to low-temperature environments, including a radiator 1 and a fan 2. The fan 2 is arranged on one side of the radiator 1. The radiator 1 internally includes a low-temperature water heat dissipation unit and a high-temperature water heat dissipation unit. High-temperature water circulation pipelines and low-temperature water circulation pipelines are respectively arranged outside the radiator 1;

[0019] The high-temperature water circulation pipeline includes a high-temperature water pump 11, an oil cooler 9, and a high-temperature water thermostat 5. One end of the high-temperature water pump 11 is connected to the high-temperature water heat dissipation unit, and the other end of the high-temperature water pump is connected to the oil cooler 9. One end of the oil cooler 9 is connected to the diesel engine, and the output pipeline of the diesel engine is connected to the high-temperature water thermostat 5. One end of the high-temperature water thermostat 5 is connected to the high-temperature water heat dissipation unit. There is a pipeline between the high-temperature water thermostat 5 and the high-temperature water pump 11. A fuel boiler preheater 7 is connected in parallel outside the high-temperature water circulation pipeline. The interior of the fuel boiler preheater 7 includes a circulation pump, an igniter, and a heater. The fuel boiler preheater 7 is powered by DC24V. The diesel engine is ignited by the igniter to heat the cooling water, and then circulated by its own circulation pump. At the same time, the high-temperature gas discharged from the preheater can also heat the oil pan 6. The fuel boiler preheater 7 is connected to the pipeline between the high-temperature water thermostat 5 and the high-temperature water pump 11, the pipeline between the high-temperature water pump 11 and the oil cooler 9, and the oil pan 6 respectively. There is an oil pre-feed pump 8 between the output pipeline of the oil pan 6 and the oil cooler 9. After the high-temperature water exits the diesel engine, it enters the high-temperature water thermostat 5. The opening temperature of the high-temperature water thermostat 5 is 72 - 80°C. When the water temperature is lower than 70°C, the high-temperature water flows back into the high-temperature water pump 11 and enters the diesel engine for circulation. When the water temperature is higher than 80°C, the high-temperature water flows through the high-temperature water heat dissipation unit for cooling;

[0020] The low-temperature water circulation pipeline includes a low-temperature water pump 14, an air cooler 12, and a low-temperature water thermostat 13. One end of the low-temperature water pump 14 is connected to the low-temperature water heat dissipation unit, and the other end of the low-temperature water pump is connected to the air cooler 12. One end of the air cooler 12 is connected to the low-temperature water thermostat 13. One end of the low-temperature water thermostat 13 is connected to the low-temperature water heat dissipation unit. There is a pipeline between the low-temperature water thermostat 13 and the low-temperature water pump 14. The low-temperature water of the diesel engine is pressurized by the low-temperature water pump 14 and then enters the air cooler 12 to cool the supercharged air. After exiting the diesel engine from the air cooler 12, it enters the low-temperature water thermostat 13. The opening temperature of the low-temperature water thermostat 13 is 27 - 32°C. When the water temperature is lower than 27°C, the low-temperature water flows back into the low-temperature water pump 14 and enters the diesel engine for circulation. When the water temperature is higher than 32°C, the low-temperature water is cooled by the low-temperature water heat dissipation unit;

[0021] The control system further includes a control system for controlling the rotation speed of the fan 2, the control system includes a diesel engine ECU 18, a fan clutch 3, a high-temperature water temperature sensor 4, a low-temperature water temperature sensor 15, a starter motor 17 and an ambient temperature sensor 16, the fan clutch 3 is connected to the fan 2, the high-temperature water temperature sensor 4 is arranged on the pipeline between the high-temperature water thermostat 5 and the high-temperature water cooling unit, the low-temperature water temperature sensor 15 is arranged on the pipeline between the low-temperature water cooling unit and the low-temperature water pump 14, the starter motor 17 is connected to the diesel engine, the ambient temperature sensor 16 is arranged in the diesel engine, a battery valve 31 and a speed sensor 32 are arranged inside the fan clutch 3, the input end of the diesel engine ECU 18 is electrically connected to the output end of the low-temperature water temperature sensor 15, the high-temperature water temperature sensor 4, the ambient temperature sensor 16 and the speed sensor 32 respectively, and the output end of the diesel engine ECU 18 is electrically connected to the fan clutch 3, the oil pre-supply pump 8, the fuel boiler preheater 7, the battery valve 31 and the input end of the starter motor 17 respectively.

[0022] The radiator 1 is cooled by the fan 2, which is driven by the fan clutch 3. The fan clutch 3 and the diesel engine are driven by a belt. The fan clutch 3 can adjust the speed of the fan 2. The speed of the fan 2 is adjusted according to the low-temperature water inlet temperature and the high-temperature water outlet temperature of the diesel engine. The diesel engine cooling water temperature is collected by the high-temperature water temperature sensor 4 and the low-temperature water temperature sensor 15 installed in the cooling water pipeline, and enters the diesel engine ECU18. After judgment by the diesel engine ECU18, the fan clutch 3 controls the opening of the battery valve 31, and then controls the output speed of the fan clutch 3. A speed sensor 32 is installed inside the fan clutch 3, and the speed of the fan 2 is provided to the diesel engine ECU18 for monitoring. At the same time, the diesel engine ECU18 controls the diesel engine oil pre-supply, cooling water preheating and diesel engine starting.

[0023] A one-way valve 10 is provided on the pipeline between the high-temperature water pump 11 and the oil cooler 9, and the one-way valve 10 ensures that all the coolant inside the diesel engine participates in the circulation.

[0024] The diesel engine monitors the high-temperature water and intake air temperature in real time. When the high-temperature water temperature is ≤25℃ or the intake air temperature is ≤5℃, the diesel engine starter motor is not allowed to start the diesel engine. When the diesel engine starts the preheating function, the fuel boiler preheater 7 burns diesel to heat the high and low temperature water of the diesel engine. The circulating pump of the fuel boiler drives the high and low temperature water to circulate inside the diesel engine. The thermostat in the high and low temperature water circulation pipeline ensures that the coolant of the radiator does not participate in the preheating. When the high-temperature water or intake air temperature meets the starting requirements, the diesel engine can be started.

[0025] After the diesel engine starts and runs at idle speed or under no load, the intake air flow is small and the intake air temperature is low. The diesel engine ECU 18 adjusts the fuel injection advance angle according to the water temperature and the intake air temperature after air cooling. When the intake air temperature ≤ 0 °C, for every 5 °C drop, the fuel injection advance angle increases by 2°. At this time, the temperature in the cylinder rises and the diesel engine burns well. The high-temperature water and the low-temperature water only carry out a small in-engine circulation under the action of their respective thermostats and do not participate in the large circulation of radiator cooling. The water temperature and the intake air temperature rise rapidly. The fan clutch 2 controls the fan 2 to operate in the lowest speed range under the control of the high-temperature water and the low-temperature water temperatures. The air volume of the fan is low and the radiant heat of the diesel engine is small, which is beneficial to increasing the rising speed of the diesel engine water temperature.

[0026] After the water temperature rises to a reasonable range, the diesel engine can increase its speed and load. The water temperature and the intake air temperature after air cooling rise relatively quickly, and the thermostat gradually opens, and the coolant enters the radiator 1 for cooling. While the water temperature and the intake air temperature after air cooling are rising, the fan clutch 3 starts to engage, the speed of the fan 2 increases, and the cooling capacity of the radiator 1 is enhanced to maintain the water temperature of the diesel engine within a reasonable operating range. Throughout the operating range of the diesel engine, the fan clutch 3 controls the fan speed according to the high-temperature water and the low-temperature water temperatures, which can reduce the power loss of the fan and improve the economic performance of the diesel engine.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-power fan cooling system for a diesel engine adapted to low-temperature environments, comprising a radiator (1) and a fan (2), wherein the fan (2) is arranged on one side of the radiator (1). Characterized in that: The interior of the radiator (1) includes a low-temperature water heat dissipation unit and a high-temperature water heat dissipation unit, and high-temperature water circulation pipelines and low-temperature water circulation pipelines are respectively arranged outside the radiator (1). The high-temperature water circulation pipeline includes a high-temperature water pump (11), an oil cooler (9), and a high-temperature water thermostat (5). One end of the high-temperature water pump (11) is connected to the high-temperature water heat dissipation unit, the other end of the high-temperature water pump is connected to the oil cooler (9), one end of the oil cooler (9) is connected to the diesel engine, the output pipeline of the diesel engine is connected to the high-temperature water thermostat (5), one end of the high-temperature water thermostat (5) is connected to the high-temperature water heat dissipation unit, a pipeline is arranged between the high-temperature water thermostat (5) and the high-temperature water pump (11), a fuel boiler preheater (7) is connected in parallel outside the high-temperature water circulation pipeline, and the fuel boiler preheater (7) is respectively connected to the pipeline between the high-temperature water thermostat (5) and the high-temperature water pump (11), the pipeline between the high-temperature water pump (11) and the oil cooler (9), and the oil pan (6). An output pipeline of the oil pan (6) is connected to the oil cooler (9), an oil pre-feed pump (8) is arranged between the output pipeline of the oil pan (6) and the oil cooler (9), and a check valve (10) is arranged on the pipeline between the high-temperature water pump (11) and the oil cooler (9). The low-temperature water circulation pipeline includes a low-temperature water pump (14), an air cooler (12), and a low-temperature water thermostat (13). One end of the low-temperature water pump (14) is connected to the low-temperature water heat dissipation unit, the other end of the low-temperature water pump (14) is connected to the air cooler (12), one end of the air cooler (12) is connected to the low-temperature water thermostat (13), one end of the low-temperature water thermostat (13) is connected to the low-temperature water heat dissipation unit, and a pipeline is arranged between the low-temperature water thermostat (13) and the low-temperature water pump (14). It further includes a control system for controlling the rotation speed of the fan (2).

2. The high-power fan cooling system for a diesel engine adapted to low-temperature environments according to claim 1, Characterized in that: The control system includes a diesel engine ECU (18), a fan clutch (3), a high-temperature water temperature sensor (4), a low-temperature water temperature sensor (15), a starting motor (17), and an ambient temperature sensor (16). The fan clutch (3) is connected to the fan (2). The high-temperature water temperature sensor (4) is arranged on the pipeline between the high-temperature water thermostat (5) and the high-temperature water heat dissipation unit. The low-temperature water temperature sensor (15) is arranged on the pipeline between the low-temperature water heat dissipation unit and the low-temperature water pump (14). The starting motor (17) is connected to the diesel engine. The ambient temperature sensor (16) is arranged inside the diesel engine. The input ends of the diesel engine ECU (18) are electrically connected to the output ends of the low-temperature water temperature sensor (15), the high-temperature water temperature sensor (4), and the ambient temperature sensor (16) respectively. The output ends of the diesel engine ECU (18) are electrically connected to the input ends of the fan clutch (3), the oil pre-feed pump (8), the fuel boiler preheater (7), and the starting motor (17) respectively.

3. The high-power fan cooling system for a diesel engine adapted to a low-temperature environment according to claim 2, characterized in that: a solenoid valve (31) and a speed sensor (32) are arranged inside the fan clutch (3). The output end of the speed sensor (32) is electrically connected to the input end of the diesel engine ECU (18). The output end of the diesel engine ECU (18) is electrically connected to the input end of the solenoid valve (31).

4. The high-power fan cooling system for a diesel engine adapted to a low-temperature environment according to claim 1, characterized in that: the inside of the fuel boiler preheater (7) includes a circulation pump, an igniter, and a heater.

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