CN111663989A - Engine cooling system and vehicle - Google Patents
Engine cooling system and vehicle Download PDFInfo
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- CN111663989A CN111663989A CN202010625021.8A CN202010625021A CN111663989A CN 111663989 A CN111663989 A CN 111663989A CN 202010625021 A CN202010625021 A CN 202010625021A CN 111663989 A CN111663989 A CN 111663989A
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- engine
- cooling
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- temperature
- water pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/002—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/021—Cooling cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/024—Cooling cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
The invention provides an engine cooling system and a vehicle, relates to the technical field of vehicles, and aims to solve the technical problems of long warm-up time and low exhaust temperature of an engine. The engine cooling system comprises a water pump, a thermostat, a cooling device and an adjusting device, wherein the adjusting device comprises an adjusting valve, a controller and a temperature sensor, a liquid inlet of the adjusting valve is communicated with a liquid outlet of the water pump, and a liquid outlet of the adjusting valve is communicated with a liquid inlet of the water pump; the temperature sensor is used for detecting the temperature of cooling liquid in a cooling channel of the engine, and when the temperature of the cooling liquid is smaller than or equal to a first preset temperature, the controller controls the regulating valve to be opened, so that at least part of the cooling liquid circulates between the water pump and the regulating valve, the flow rate of the cooling liquid in the cooling channel of the engine is reduced, the convective heat transfer coefficient of the engine is reduced, the heat radiation amount of the engine is reduced, the temperature is rapidly increased, the warm-up time of the engine in the starting stage is shortened, and the exhaust temperature is improved. In addition, the invention also provides a vehicle.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an engine cooling system and a vehicle.
Background
The engine cooling system is an important component of the engine, and heat of the engine is dissipated in time through circulation of a cooling medium so as to ensure that the engine works under an allowable temperature condition. The design of engine cooling systems has a tremendous effect on improving engine performance and reliability as well as improving fuel economy.
The engine cooling system is connected with a cooling channel of the engine and comprises a water pump and a thermostat, wherein the water pump increases the pressure of a cooling medium so that the cooling medium flows in the cooling channel of the engine, and the thermostat adjusts the cooling mode of the engine cooling system. The cooling mode of the engine cooling system is formed by a cold vehicle circulation and a normal circulation so as to ensure that the engine can work better under different working conditions. The cold vehicle circulation means that after an engine is started in a cold state, a thermostat in an engine cooling system is closed, and a cooling medium circularly flows in a cooling channel between a water pump and the engine, so that the engine reaches a normal working temperature as soon as possible; when the temperature of the cooling medium reaches the set value of the thermostat, the thermostat is opened, and the cooling medium circularly flows among the water pump, the cooling channel of the engine and the radiator so as to ensure the normal work of the engine.
When the engine is in a starting stage, the engine cooling system enables the engine to be long in warming-up time and low in exhaust temperature.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide an engine cooling system and a vehicle for shortening a warm-up time of an engine in a start phase and increasing an exhaust temperature.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides an engine cooling system, including a water pump, a thermostat, a cooling device, and an adjusting device, where:
the water pump, a cooling channel of the engine, a main valve of the thermostat and the cooling device are communicated in sequence to form a first circulation loop; the water pump, a cooling channel of the engine and an auxiliary valve of the thermostat are communicated in sequence to form a second circulation loop; the adjusting device comprises an adjusting valve, a controller and a temperature sensor, wherein a liquid inlet of the adjusting valve is communicated with a liquid outlet of the water pump, and a liquid outlet of the adjusting valve is communicated with a liquid inlet of the water pump; the temperature sensor is used for detecting the temperature of cooling liquid in a cooling channel of the engine, when the temperature of the cooling liquid is smaller than or equal to a first preset temperature, the controller controls the regulating valve to be opened, so that at least part of the cooling liquid circulates between the water pump and the regulating valve, and the cooling channel of the engine is a channel for the cooling liquid to pass through in a cylinder body and/or a cylinder cover of the engine.
In the engine cooling system provided by the embodiment of the invention, the circulation path of the cooling liquid comprises a first circulation loop consisting of the water pump, the cooling channel of the engine, the main valve of the thermostat and the cooling device, and a second circulation loop consisting of the water pump, the cooling channel of the engine and the auxiliary valve of the thermostat. Wherein, the liquid outlet of water pump still communicates with the inlet of the governing valve among the adjusting device, and the inlet of water pump communicates with the liquid outlet of governing valve, and temperature sensor among the adjusting device detects the coolant temperature among the cooling channel of engine. When the temperature of the cooling liquid is less than or equal to the first preset temperature, the controller controls the regulating valve to be opened, so that at least part of the cooling liquid circulates between the water pump and the regulating valve, the flow speed of the cooling liquid in the second circulation loop is reduced, the convective heat transfer coefficient of the engine is reduced, the heat dissipation capacity of the engine is reduced, the temperature is rapidly raised, the warm-up time of the engine in the starting stage is shortened, and the exhaust temperature of the engine is increased.
In the engine cooling system as described above, when the temperature of the coolant is greater than a first preset temperature and less than or equal to a second preset temperature, the controller controls the opening degree of the regulating valve to be decreased so that a part of the coolant circulates between the water pump and the regulating valve and another part of the coolant circulates in the second circulation circuit.
In the engine cooling system as described above, when the temperature of the coolant is greater than a second preset temperature, the controller controls the regulating valve to close so that the coolant circulates in the second circulation circuit.
In the cooling system of the engine, the thermostat includes a main valve and an auxiliary valve, the main valve and the auxiliary valve share the same valve body, a valve core is disposed inside the valve body, and when the temperature of the coolant reaches a third preset temperature, the valve core closes the auxiliary valve and opens the main valve.
In the engine cooling system as described above, the thermostat is a wax thermostat.
In the engine cooling system as described above, the water pump is a displacement pump or a vane pump.
The engine cooling system as described above, the cooling device includes a radiator and a cooling fan for radiating heat from the radiator.
The engine cooling system further comprises an oil cooler, and the oil cooler is arranged between the water pump and the cooling channel of the engine and communicated with the water pump and the cooling channel of the engine.
In a second aspect, an embodiment of the invention provides a vehicle, which includes an engine, and the engine cooling system as described above, wherein a cooling passage is provided in the engine, and the cooling passage is connected to the engine cooling system.
The vehicle in the embodiment of the invention includes the engine cooling system, so that the vehicle also has the advantages of the engine cooling system, the warm-up time of the vehicle in the starting stage can be shortened, and the exhaust temperature of the engine can be improved.
The vehicle as described above, the engine includes a cylinder block and a cylinder head mounted on the cylinder block, the cylinder head having the cooling passage provided therein.
In addition to the technical problems addressed by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems that the engine cooling system and the vehicle provided by the embodiments of the present invention can solve, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an engine cooling system according to an embodiment of the present invention;
fig. 2 is an operational schematic diagram of an engine cooling system according to an embodiment of the present invention.
10. A water pump;
20. an oil cooler;
30. a cooling passage of the engine;
40. a thermostat;
50. a cooling device;
60. an adjustment device;
70. a second circulation loop.
Detailed Description
In order to solve the problems of long warm-up time and low exhaust temperature in the engine starting stage, the embodiment of the invention provides an engine cooling system, wherein a liquid outlet of a water pump is communicated with a liquid inlet of an adjusting valve, the liquid inlet of the water pump is communicated with the liquid outlet of the adjusting valve, the opening degree of the adjusting valve is controlled according to the temperature in a cooling channel of an engine, so that part of cooling liquid circulates between the water pump and the adjusting valve, and the flow rate of the cooling liquid in the water pump and the adjusting valve is controlled, so that the cooling effect of the engine cooling system is reduced, the heat dissipation capacity of the engine is reduced, the temperature of the engine is increased rapidly, the warm-up time in the engine starting stage is shortened, and the exhaust temperature of the engine is increased.
In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The vehicle provided by the embodiment of the invention comprises an engine, wherein the engine comprises a cylinder body and a cylinder cover, and the cylinder cover is arranged on the cylinder body to seal the cylinder body to form a combustion chamber. The cylinder cover is internally provided with a cooling channel of the engine, the cooling channel is connected with an engine cooling system and is used for allowing cooling liquid to flow, so that part of heat in the engine is taken away by the cooling liquid, and the heat is radiated or conducted to the outside of the engine through the cooling channel to reduce the temperature of the engine, and the cooling channel can be arranged in the cylinder body of the engine.
It should be noted that, in order to improve the cooling effect of the engine cooling system, a cooling channel may also be provided in the engine cylinder, and the cooling channel in the cylinder is communicated with the cooling channel in the cylinder head, so that the cylinder may also be cooled by the coolant, thereby increasing the heat dissipation area of the engine, further reducing the temperature of the engine, and ensuring that the engine can normally operate.
It should be noted that the cooling channel of the engine is a channel for the cooling liquid to flow through, and the cross-sectional shape of the cooling channel may be circular, and the cooling channel of the engine may be arranged in a zigzag manner or in a zigzag manner in the cylinder block and/or the cylinder head, so as to increase the cooling effect.
In this embodiment, the cylinder body and the cylinder cover may be made of gray cast iron, alloy cast iron, aluminum alloy, or the like, and the cylinder body and the cylinder cover may be made of the same material or different materials, for example, the cylinder body and the cylinder cover may be made of magnesium aluminum alloy with light weight and good heat conductivity, so that the weight of the engine may be reduced while the heat dissipation effect of the engine is ensured.
The coolant may be selected from water or glycol-water solution, and the glycol-water solution includes an anti-freezing agent, an additive for preventing corrosion of metal, and water, and has good anti-freezing property, corrosion resistance, thermal conductivity, and stability, and in view of this, the coolant in the embodiment of the present invention may be selected from glycol-water solution, such as DEX-COOL coolant or G12 coolant.
Referring to fig. 1, the engine cooling system of the embodiment of the present invention includes a water pump 10, a thermostat 40, a cooling device 50, and an adjusting device 60. Wherein, the liquid outlet of the water pump 10 is connected with one end of the cooling channel 30 of the engine, the other end of the cooling channel 30 of the engine is connected with one end of the cooling device 50 through the main valve of the thermostat 40, and is connected with the liquid inlet of the water pump 10 through the auxiliary valve of the thermostat 40, and the other end of the cooling device 50 is also connected with the liquid inlet of the water pump 10.
The water pump 10 is primarily used to transport liquids including water, oil, acid and base liquids, emulsions, suspoemulsions, liquid metals, etc., as well as gas mixtures and liquids containing suspended solids. In this embodiment, the water pump 10 drives the coolant to circulate in the engine cooling system, which is the power of the engine cooling system.
It should be noted that, in the embodiment of the present invention, the specific type of the water pump 10 is not limited, the water pump 10 may be a vane pump or a displacement pump, and the water pump 10 is selected according to the operating requirement of the engine cooling system.
When the water pump 10 is a vane pump, the water pump 10 may be a centrifugal pump. Under the high-speed rotation of water pump 10 blade, coolant liquid gets into water pump inner chamber and liquid outlet through the water pump inlet, forms the low-pressure region in the rotation center department of blade simultaneously, and the coolant liquid is constantly supplied into, forms continuous suction and discharge process, realizes the circulation flow of coolant liquid in engine cooling system.
The thermostat 40 in the embodiment of the present invention includes a main valve disposed at one end of a valve body, an auxiliary valve disposed at the other end of the valve body, a valve core disposed inside the valve body, and a temperature sensing body disposed inside the valve body, which measures the temperature of the coolant in the thermostat 40 and adjusts the opening and closing of the main valve and the auxiliary valve according to the measured temperature.
The thermostat 40 may be a wax thermostat, and the temperature sensing body is paraffin. When the temperature of the cooling liquid is lower than a third preset temperature, the paraffin is in a solid state, the valve core of the thermostat 40 opens the auxiliary valve and closes the main valve, and the cooling liquid circularly flows in the water pump 10 and the cooling channel 30 of the engine, so that the engine reaches a normal working temperature as soon as possible; when the temperature of the cooling liquid reaches a third preset temperature, the paraffin starts to melt and gradually becomes liquid, the volume is increased, so that the valve core is pushed to close the auxiliary valve, the main valve is opened, and the cooling liquid circularly flows among the water pump 10, the cooling channel 30 of the engine and the cooling device 50 to ensure the normal work of the engine.
The cooling device 50 in the embodiment of the present invention is used for cooling the coolant, the cooling device 50 includes a radiator, the coolant flows inside the radiator, air passes through the radiator, when the temperature of the coolant is higher than the temperature of the air, the coolant radiates heat into the air to reduce the temperature, and the air absorbs the heat radiated by the coolant to increase the temperature, that is, the radiator reduces the temperature of the coolant through heat exchange, so that the coolant further cools the engine.
In order to improve the cooling effect of the engine cooling system, a cooling fan is further installed near the radiator, the cooling fan dissipates heat of the radiator, surrounding air is driven by the cooling fan to move, the flow speed and flow of the air flowing through the radiator are improved, the heat convection coefficient of the radiator is increased, the heat dissipation of the radiator is accelerated, the cooling speed of cooling liquid is accelerated, and the cooling effect of the engine cooling system is improved.
It should be noted that the material of the heat sink may be copper, aluminum or copper alloy, the material of the cooling fan may be aluminum or aluminum alloy, and the material of the heat sink and the material of the cooling fan may be the same or different, which is not limited herein.
It should be noted that, the engine cooling system in the embodiment of the present invention further includes an oil cooler 20, referring to fig. 2, one end of the oil cooler 20 is communicated with the liquid outlet of the water pump 10, and the other end is communicated with the cooling channel 30 of the engine, and the coolant flows through the oil cooler 20 to cool the oil in the oil cooler 20, so as to prevent the temperature of the oil from being too high during the operation process to reduce the lubricating effect of the oil, so as to ensure that the engine can normally operate.
The water pump 10, the oil cooler 20, the engine cooling passage 30, and the main valve of the thermostat 40 are connected to the cooling device 50 in this order to form a first circulation circuit. When the engine is in normal load operation, when the coolant flows in the first circulation circuit of the engine cooling system, namely the coolant flows through the water pump 10, the oil cooler 20, the cooling passage 30 of the engine, the main valve of the thermostat 40 and the cooling device 50 in sequence and then returns to the water pump 10, the engine cooling system is in a normal circulation state, at this time, the coolant flows through the cooling device 50, the circulation circuit is long, the heat dissipation strength is high, and the engine can be cooled rapidly.
The water pump 10, the oil cooler 20, the engine cooling passage 30, and the auxiliary valve of the thermostat 40 are connected in this order to form a second circulation circuit 70. When the engine is initially started or runs at a low load, when the coolant flows in the second circulation loop 70 of the engine cooling system, namely the coolant flows through the water pump 10, the engine oil cooler 20, the cooling channel 30 of the engine and the auxiliary valve of the thermostat 40 in sequence and then returns to the water pump 10, the engine cooling system is in a cold vehicle circulation state, at the moment, the flow line section of the coolant is short, the heat dissipation intensity is low, the temperature of the engine is rapidly increased, and the engine can reach a normal working state as soon as possible.
The engine cooling system in the embodiment of the invention further comprises an adjusting device 60, wherein the adjusting device 60 adjusts the flow rate of the cooling liquid in the engine cooling system according to the temperature of the cooling channel 30 of the engine, so that the cooling effect of the engine cooling system is adjusted, the heat dissipation capacity of the engine in the starting stage is reduced, the temperature of the engine is increased, the warming-up time of the engine is short, and the exhaust temperature is high.
The adjusting device 60 in the embodiment of the present invention includes an adjusting valve, a controller, and a temperature sensor, the adjusting valve is connected in parallel with the water pump 10, that is, a liquid outlet of the adjusting valve is communicated with a liquid inlet of the water pump 10, a liquid inlet of the adjusting valve is communicated with a liquid outlet of the water pump 10, when the adjusting valve is opened, the cooling liquid circulates between the water pump 10 and the adjusting valve, thereby reducing the flow rate of the cooling liquid flowing through the cooling channel 30 of the engine, and reducing the heat dissipation capacity of the engine; when the regulator valve is closed, the coolant flows in the second circulation circuit 70, cooling the engine.
The temperature sensor of the adjusting device 60 is provided in the cooling passage 30 of the engine for detecting the temperature of the coolant in the cooling passage 30 of the engine, and is electrically connected to a controller that controls the opening and closing of the adjusting valve. When the temperature sensor detects that the temperature of the cooling liquid in the cooling channel 30 of the engine is less than or equal to a first preset temperature, the controller controls the regulating valve to be opened, so that part of the cooling liquid circulates between the water pump and the regulating valve, the flow rate of the cooling liquid flowing through the cooling channel 30 of the engine is reduced, and the heat dissipation capacity of the engine is reduced.
In order to further improve the cooling performance of the engine cooling system, the controller of the regulating device 60 may control the opening of the regulating valve according to the temperature of the coolant in the cooling channel 30 of the engine detected by the temperature sensor, and may adjust the flow rate of the coolant flowing through the cooling channel 30 of the engine by adjusting the flow rate of the coolant in the water pump 10 and the regulating valve, so that the engine cooling system may adjust the cooling effect according to the temperature of the engine.
In the embodiment of the present invention, the regulating valve may be a proportional valve, and the opening degree of the proportional valve changes inversely with the temperature of the coolant in the cooling passage 30 of the engine, that is, the opening degree of the proportional valve decreases as the temperature of the coolant in the cooling passage 30 of the engine increases.
When the temperature of the coolant in the cooling passage 30 of the engine is low, the opening degree of the proportional valve is large, the coolant mainly circulates between the water pump 10 and the regulating valve, the flow rate of the coolant flowing through the cooling passage 30 of the engine is low, the cooling effect of the engine cooling system is low, and the engine can be rapidly heated.
When the temperature of the coolant in the cooling passage 30 of the engine increases, the opening degree of the proportional valve gradually decreases, part of the coolant circulates between the water pump 10 and the regulator valve, part of the coolant circulates in the second circulation circuit 70, and the smaller the opening degree of the proportional valve is, the more the coolant circulates in the second circulation circuit 70, the faster the flow rate of the coolant flowing through the cooling passage 30 of the engine is, the better the cooling effect of the engine cooling system is, and the lower the temperature rise rate of the engine is.
The operation of the engine cooling system in the embodiment of the present invention is described in detail below with reference to fig. 2.
When the engine is initially started, and the temperature of the coolant in the cooling passage 30 of the engine measured by the temperature sensor in the adjusting device 60 is less than or equal to a first preset temperature, the adjusting valve in the adjusting device 60 is fully opened, the coolant circulates between the water pump 10 and the adjusting valve, the flow rate of the coolant flowing through the cooling passage 30 of the engine is the lowest, the heat dissipation capacity of the engine is small, and the engine can be rapidly heated.
Meanwhile, the valve core of the thermostat 40 in the engine cooling system opens the auxiliary valve and closes the main valve, so that the cooling liquid flows only in the second circulation loop 70 consisting of the water pump 10, the engine oil cooler 20, the cooling channel 30 of the engine and the auxiliary valve of the thermostat 40, the heat dissipation capacity of the engine is further reduced, the engine reaches the normal working temperature as soon as possible, the warming-up time of the engine is shortened, and the exhaust temperature is improved.
When the temperature of the coolant in the cooling passage 30 of the engine measured by the temperature sensor in the adjusting device 60 is greater than a first preset temperature and less than or equal to a second preset temperature, the controller controls the opening degree of the adjusting valve to decrease, so that a part of the coolant circulates between the water pump 10 and the adjusting valve, and another part of the coolant circulates in the second circulation circuit 70, and as the temperature of the coolant in the cooling passage 30 of the engine increases, the opening degree of the adjusting valve gradually decreases, the flow rate of the coolant circulating in the second circulation circuit 70 increases, the flow rate of the coolant in the cooling passage 30 of the engine gradually increases, so that the convective heat transfer coefficient of the engine increases, the heat radiation amount of the engine increases, and thus the cooling effect of the engine cooling system gradually increases as the temperature of the engine increases.
When the temperature of the coolant in the cooling passage 30 of the engine measured by the temperature sensor in the regulating device 60 is higher than the second preset temperature, the controller controls the regulating valve to close, the coolant circulates in the second circulation circuit 70, and the cooling effect of the engine is enhanced.
When the temperature of the coolant in the cooling passage 30 of the engine reaches the third preset temperature, the valve core of the thermostat 40 closes the secondary valve and opens the main valve, and the coolant circulates in the first circulation circuit sequentially communicated by the water pump 10, the oil cooler 20, the cooling passage 30 of the engine, the main valve of the thermostat 40 and the cooling device 50, so that the cooling effect of the engine cooling system is further enhanced to ensure that the engine operates at an allowable temperature.
In the engine cooling system according to the embodiment of the present invention, the circulation path of the coolant includes the first circulation circuit composed of the water pump 10, the cooling passage 30 of the engine, the main valve of the thermostat 40, and the cooling device 50, and the second circulation circuit 70 composed of the water pump 10, the cooling passage 30 of the engine, and the sub valve of the thermostat 40. Wherein, the liquid outlet of water pump 10 still communicates with the inlet of the governing valve in adjusting device 60, and the inlet of water pump 10 communicates with the liquid outlet of governing valve, and the temperature sensor in adjusting device 60 detects the coolant temperature in the cooling passage 30 of engine. When the temperature of the coolant is less than or equal to the first preset temperature, the controller controls the regulating valve to be opened, so that at least part of the coolant circulates between the water pump 10 and the regulating valve, the flow rate of the coolant in the second circulation loop 70 is reduced, the convective heat transfer coefficient of the engine is reduced, the heat dissipation capacity of the engine is reduced, the temperature is rapidly raised, the warm-up time of the engine in the starting stage is shortened, and the exhaust temperature of the engine is increased.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In the description of the present specification, references to "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An engine cooling system, comprising a water pump, a thermostat, a cooling device and an adjusting device, wherein:
the water pump, a cooling channel of the engine, a main valve of the thermostat and the cooling device are communicated in sequence to form a first circulation loop; the water pump, a cooling channel of the engine and an auxiliary valve of the thermostat are communicated in sequence to form a second circulation loop;
the adjusting device comprises an adjusting valve, a controller and a temperature sensor, wherein a liquid inlet of the adjusting valve is communicated with a liquid outlet of the water pump, and a liquid outlet of the adjusting valve is communicated with a liquid inlet of the water pump; the temperature sensor is used for detecting the temperature of cooling liquid in a cooling channel of the engine, and when the temperature of the cooling liquid is smaller than or equal to a first preset temperature, the controller controls the regulating valve to be opened so that at least part of the cooling liquid circulates between the water pump and the regulating valve;
the cooling channel of the engine is a channel for the cooling liquid to pass through in the cylinder body and/or the cylinder cover of the engine.
2. The engine cooling system according to claim 1, wherein when the temperature of the coolant is greater than a first preset temperature and less than or equal to a second preset temperature, the controller controls the opening degree of the regulating valve to be decreased so that a part of the coolant circulates between the water pump and the regulating valve and another part of the coolant circulates in the second circulation circuit.
3. The engine cooling system according to claim 1, wherein the controller controls the regulating valve to close to circulate the coolant in the second circulation circuit when the temperature of the coolant is greater than a second preset temperature.
4. The engine cooling system according to any one of claims 1 to 3, wherein the thermostat includes a main valve and a sub-valve, the main valve and the sub-valve share a common valve body, a valve element is disposed inside the valve body, and when the temperature of the coolant reaches a third preset temperature, the valve element closes the sub-valve and the main valve opens.
5. Engine cooling system according to claim 4, characterized in that the thermostat is a wax thermostat.
6. Engine cooling system according to any one of claims 1-3, characterized in that the water pump is a positive displacement pump or a vane pump.
7. Engine cooling system according to any one of claims 1-3, characterized in that the cooling device comprises a radiator and a cooling fan for dissipating heat from the radiator.
8. The engine cooling system according to any one of claims 1 to 3, further comprising an oil cooler provided between and in communication with the water pump and the cooling passage of the engine.
9. A vehicle characterized by comprising an engine, and an engine cooling system according to any one of claims 1 to 8, the engine having a cooling passage provided therein, the cooling passage being connected in the engine cooling system.
10. The vehicle of claim 9, characterized in that the engine includes a block and a head mounted on the block, the head having the cooling passages disposed therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010625021.8A CN111663989A (en) | 2020-07-02 | 2020-07-02 | Engine cooling system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010625021.8A CN111663989A (en) | 2020-07-02 | 2020-07-02 | Engine cooling system and vehicle |
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| CN111663989A true CN111663989A (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010625021.8A Pending CN111663989A (en) | 2020-07-02 | 2020-07-02 | Engine cooling system and vehicle |
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| CN115163282A (en) * | 2022-07-14 | 2022-10-11 | 东风汽车集团股份有限公司 | Control method and control system for cooling engine |
| CN115574077A (en) * | 2022-12-07 | 2023-01-06 | 中国重汽集团济南动力有限公司 | Lubricating oil active cooling structure of double-high-speed motor drive axle |
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| CN115574077B (en) * | 2022-12-07 | 2023-03-14 | 中国重汽集团济南动力有限公司 | Lubricating oil active cooling structure of double-high-speed motor drive axle |
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Application publication date: 20200915 |