WO2015192636A1

WO2015192636A1 - Heat radiating device for engine, cooling system and method for engine

Info

Publication number: WO2015192636A1
Application number: PCT/CN2014/095653
Authority: WO
Inventors: 孙韶阳; 杨洁; 李国红
Original assignee: 北汽福田汽车股份有限公司; 北京智科投资管理有限公司
Priority date: 2014-06-17
Filing date: 2014-12-30
Publication date: 2015-12-23
Also published as: DE112014006749T5; CN104832268A

Abstract

A heat radiating device for an engine, comprising a radiator (1) and a variable grid (5). The variable grid (5) is connected to and covers the radiator (1). The variable grid (5) is provided with a grid opening angle control part for controlling the opening angle of the variable grid, so that the working environment temperature of the engine is regulated in real time, rapid warm-up of the engine is achieved, opening time of cooling fan is reduced and energy is saved. A cooling system and a cooling method for engine are also disclosed.

Description

Heat sink for engine, engine cooling system and method

Technical field

The invention belongs to the technical field of vehicles, and in particular to a heat sink for an engine, an engine cooling system and a method.

Background technique

The engine generates a large amount of heat during operation, which causes the engine temperature to rise, which seriously affects the performance of the engine. In order for the engine to operate within the normal temperature range, a cooling system is required for the engine.

Referring to Fig. 1, a conventional engine cooling system generally includes a radiator 1 and a cooling fan 2, and a cooling fan 2 is disposed on the radiator 1, and the radiator 1 is disposed on a front windward surface of the front end of the nacelle. Referring to FIG. 2, the specific structure of the radiator 1 is generally composed of a water inlet chamber 12, a core body 11 and a water outlet chamber 13, and the water inlet chamber 12 and the water outlet chamber 13 of the radiator are respectively connected to the cooling water passages in the engine 3. Since the radiator itself does not have the temperature control function, the thermostat 4 is generally disposed on the communication pipe between the inlet chamber 12 of the radiator and the cooling water passage in the engine, when the temperature of the coolant in the engine is higher than the preset At the temperature, the thermostat 4 is turned on, and the coolant in the engine 3 flows to the radiator 1 to dissipate heat. Since the radiator has no temperature control function, if the thermostat 4 fails, the engine is too cold. In addition, the vehicle ECU (Electronic Control Unit) also reads the temperature of the coolant collected by the temperature sensor 31 disposed in the engine cooling passage. When the temperature is too high, the cooling fan 2 is turned on to the radiator 1 Ventilation and heat dissipation.

Engine overheating and undercooling can affect engine performance. When the outside temperature is low, the heat emitted by the engine itself is already large, causing the engine to be too cold, so the thermostat and the cooling fan can be turned off at this time. However, for cold regions, especially in the winter in the north, even if the thermostat and the cooling fan are turned off, the air intake grille at the front end of the radiator is open, and the outside atmosphere is connected to the nacelle, causing an increase in engine heat loss, resulting in engine warming. Problems such as excessive machine time, low work efficiency, and increased fuel consumption of the entire vehicle seriously affect the performance of the engine.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. In view of this, it is an object of the present invention to provide a heat sink for an engine that can reduce the warm-up time of the engine in a low temperature environment.

Another object of the present invention is to provide an engine cooling system having the above described heat sink.

It is still another object of the present invention to provide an engine cooling method.

A heat dissipation device for an engine according to an embodiment of the first aspect of the present invention includes: a heat sink, the radiator package a core body, a water inlet chamber and a water outlet chamber, the core body being connected between the water inlet chamber and the water outlet chamber; a variable grid, a variable grid connection and covering the heat sink, a variable grid A grid opening angle control member is disposed on the grid, and the grid opening angle control member is configured to close the variable grid when the engine coolant temperature is lower than the first preset temperature.

According to the heat dissipating device for an engine according to an embodiment of the present invention, by providing a variable grille on the radiator, when the engine is warmed up, if the ambient temperature is low, the vane of the variable grille can be completely closed to prevent the outside atmosphere. Blowing on the engine, reducing the heat loss of the engine, ensuring the working environment temperature of the engine, greatly shortening the warm-up time of the engine, especially in the cold northern regions, the effect is more obvious; when the engine needs to be cooled, it can be pulled The grille opens the angle control component to fully or partially open the variable grille to ventilate the heat sink.

According to an example of the present invention, the heat sink further includes: an actuator coupled to the grille opening angle control member of the variable grille, the actuator being configured to cool the liquid in the outlet according to the radiator The temperature controls the opening angle of the variable grid.

According to an example of the present invention, the actuator includes: a housing fixed in a water outlet of the heat sink; a jack, the jack is disposed in the housing, and one end of the jack The casing is fixedly connected to the inner wall of the casing, and the other end is a free end; the temperature sensing unit casing is provided with a sealing space for sealing paraffin, and the temperature sensing unit casing is further provided with a cavity that is open at one end, the temperature sensing unit housing is connected to the grill opening angle control component; a flexible tube is disposed in the tunnel and sleeved outside the top rod; an elastic component, The elastic member is disposed between the temperature sensing unit housing and an inner wall of the housing.

According to an example of the present invention, the actuator includes: a temperature sensor for collecting the temperature of the coolant in the water outlet of the radiator; a stepping motor, the output end of the stepping motor and the grill opening angle The control unit is connected to the first controller, the first controller is configured to receive the temperature collected by the temperature sensor, and control the rotation of the stepping motor when the temperature of the received coolant is greater than or equal to the second preset temperature, thereby controlling The variable grille opens.

According to an example of the present invention, the variable grille includes a first bracket, a second bracket, a plurality of blades and a rotating shaft, and two ends of each of the blades are respectively rotatably connected to the first bracket and the second bracket through a rotating shaft, and the grill opening angle is The control unit is coupled to each of the vanes.

An engine cooling system according to an embodiment of the second aspect of the present invention includes a thermostat and a heat sink according to the above first embodiment of the present invention, the thermostat being disposed between the water inlet chamber of the radiator and the cooling passage in the engine On the connecting pipe, the opening temperature of the variable grille in the heat sink is greater than the opening temperature of the thermostat.

According to an example of the present invention, the engine cooling system further includes: a cooling fan fixed to the heat sink; and a collector for collecting a temperature of the coolant in the water outlet of the radiator a second controller, the second controller is configured to receive a temperature of the coolant in the water outlet, and cool in the water outlet The cooling fan is turned on when the temperature of the liquid is greater than or equal to the third preset temperature.

An engine cooling method according to an embodiment of the third aspect of the present invention, wherein the engine is cooled by an engine cooling system according to an embodiment of the second aspect of the present invention, the engine cooling method comprising the step of: cooling the temperature of the coolant in the engine is less than At a preset temperature, the thermostat, the cooling fan, and the variable grille that has been previously placed on the heat sink are turned off.

According to an example of the present invention, the engine cooling method further includes the steps of: turning on the thermostat when the temperature of the coolant in the engine is greater than or equal to the first preset temperature; and the temperature of the coolant in the outlet of the radiator is greater than or equal to the first When the temperature is preset to a preset temperature, the variable grille is opened; when the temperature of the coolant in the water outlet of the radiator is greater than or equal to the third preset temperature, the cooling fan mounted on the heat sink is turned on; the first preset temperature, the second preset The temperature and the third preset temperature are sequentially increased.

According to an example of the present invention, when the temperature of the coolant in the radiator outlet is greater than or equal to the second preset temperature, the step of opening the variable grid further includes: controlling the variable grid according to the temperature of the coolant in the outlet of the radiator The opening angle.

According to the engine cooling method of the embodiment of the present invention, when the engine is warmed up, if the ambient temperature is low, the blades of the variable grille can be completely closed, the outside atmosphere is prevented from being blown on the engine, and the heat loss of the engine is reduced, thereby ensuring The operating temperature of the engine greatly shortens the warm-up time of the engine, especially in the cold northern regions. When the engine needs cooling, the thermostat can be turned on to make the radiator heat the engine coolant. Cooling; after the thermostat is still not able to meet the cooling requirements of the engine, the angle control component can be opened by pulling the grille to fully or partially open the variable grille to ventilate and dissipate the heat sink; After the grid is fully opened, the cooling fan is activated when the engine cooling requirements are still not met. It can be seen that the present invention can achieve the purpose of quickly warming up the engine, reducing the opening time of the cooling fan, and reducing energy consumption by setting a stepped opening temperature.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural view of an engine cooling system in the related art;

2 is a schematic structural view of a heat sink in the related art;

3 is a schematic structural view of a heat sink for an engine according to an embodiment of the present invention;

4 is a schematic structural view of a wax type temperature controller used in a heat sink of an engine according to an embodiment of the present invention;

5 is a schematic structural view of still another actuator in a heat sink for an engine according to an embodiment of the present invention;

6 is a schematic structural view of an engine cooling system according to an embodiment of the present invention;

7 is a schematic structural view of a variable grid in an engine cooling system according to an embodiment of the present invention;

FIG. 8 is a flow chart showing an engine cooling method according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A heat sink for an engine according to an embodiment of the present invention will be described below with reference to Figs.

Referring to FIG. 3, a heat sink for an engine according to an embodiment of the present invention includes a heat sink 1 and a variable grille 5.

Among them, the radiator 1 includes a core body 11, a water inlet chamber 12, and a water outlet chamber 13, and the core body 11 is connected between the water inlet chamber 12 and the water outlet chamber 13. The inlet chamber 12 and the outlet chamber 13 are for communication with a cooling passage within the engine.

The variable grid 5 is connected and covered by the heat sink 1. The specific structure of the variable grille 5 is the same as that of the prior art louver, and the specific structure of the variable grille 5 will not be described herein. In a specific assembly, the variable grille 5 may be connected to the outer wall of the water inlet chamber 12 and the water outlet chamber 13 of the radiator 1, and the variable grid 5 covers the entire surface of the heat sink 1, and is opposite to the surface of the heat sink 1. There is a distance between them so that the blades of the variable grid 5 can be turned over. It will be understood by those skilled in the art that the variable grille 5 should be provided with a grill opening angle control member to adjust the flip angle of the blade. The opening angle control component may be a pull wire 51 or a tie rod. The grill opening angle control member is for closing the variable grill 5 when the engine coolant temperature is less than the first preset temperature. It should be noted that the variable grille 5 and the outer wall of the water inlet chamber 12 and the water outlet chamber 13 of the radiator 1 may be connected by bolts, or may be welded, snapped or otherwise connected. The specific connection structure of the grid 5 and the inlet chamber 12 and the outlet chamber 13 is not limited in any way.

In the specific implementation, the operator can operate the grille opening angle control component to adjust the opening and closing of the variable grille. When the engine is warmed up, the operator closes the variable grille, and after the warming up is completed, the operator can open the variable grid. In the cold area, the variable grid can also be kept closed.

When the engine is warmed up, if the ambient temperature is low, the operator can adjust the blades of the variable grille to completely close, preventing the outside air from blowing on the engine, reducing the heat loss of the engine, thereby ensuring the operating temperature of the engine, greatly Shorten the engine warm-up time, especially in the cold northern regions, the effect is more obvious; when the engine needs to be cooled, the angle control component can be opened by pulling the grille to make the variable grille fully or partially open to the radiator Ventilation and cooling; in addition, in the cold northern regions, the variable grille can also be kept closed to improve the performance of the engine.

In the above embodiment, after the variable grille 5 is closed, the outside atmosphere can be prevented from entering the engine compartment to reduce the heat loss of the engine. Therefore, the variable grille 5 in the embodiment of the present invention can be disposed on the windward side of the radiator 1 ( For example, Figure 3 The left side of the radiator 1 in the middle) blocks the entry of outside air; it can also be disposed on the leeward side of the radiator 1 (for example, the right side of the radiator 1 of Fig. 3, that is, the side facing the engine), at this time, The variable grid 5 is placed between the radiator 1 and the engine, and this arrangement can also prevent the entry of outside air by increasing the back pressure of the inlet of the radiator 1.

In order to automatically control the opening angle of the variable grille, in the above embodiments, an actuator may be additionally provided. The actuator is connected to the opening angle control member of the variable grille 5, and the actuator can automatically adjust the opening angle of the variable grille 5 according to the temperature of the coolant in the water outlet chamber 13 of the radiator 1.

Specifically, when the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is less than the second preset temperature, the actuator controls the blades of the variable grid 5 to be completely closed; when the temperature of the coolant in the outlet chamber 13 of the radiator 1 is greater than Or equal to the second preset temperature, the actuator controls the variable grille 5 to open, so that the outside atmosphere is blown on the radiator 1, and the radiator 1 is ventilated and dissipated.

When the engine is warmed up, the actuator can control the blades of the variable grille to be completely closed to ensure the operating temperature of the engine and shorten the warm-up time of the engine; when the engine needs to be cooled, the radiator is turned on, and the coolant in the engine flows through the heat sink. The temperature of the coolant in the water outlet chamber 13 of the radiator 1 is increased. When the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is greater than or equal to the second preset temperature, the actuator automatically controls the variable grid. The blade of 5 is turned over, and the angle of the blade is automatically adjusted according to the temperature of the coolant in the water outlet 13 to ventilate and dissipate the radiator, reduce the operating temperature of the engine, and improve the working performance of the engine; in the cold northern region, when When the engine is working normally, even if the radiator is turned off, the operating temperature of the engine may still be lower than the set temperature. At this time, the actuator controls the blades of the variable grille to close to improve the operating temperature of the engine.

It can be seen that the embodiment of the present invention can automatically adjust the opening angle of the variable grille according to the temperature of the coolant in the water outlet of the radiator, thereby adjusting the working environment temperature of the engine to ensure the working performance of the engine.

According to a specific embodiment of the present invention, the actuator may be a wax type temperature controller, and the wax type temperature controller is disposed in the water outlet chamber 13 of the radiator 1. Referring to FIG. 4, the wax type temperature controller includes a housing 61 and a jack 62 disposed in the housing 61, a temperature sensing unit housing 63, a flexible tube 65, and an elastic member 64. Wherein, the housing 61 is fixedly connected to the inner wall of the water outlet chamber 13 of the heat sink 1; one end of the jack 62 (for example, the left end in FIG. 4) is fixedly connected to the inner wall of the housing 61, and the other end (for example, in FIG. 4) The right end) is a free end; the temperature sensing unit housing 63 is provided with a sealing space for sealing the paraffin 66, and the temperature sensing unit housing 63 is further provided with a hole having an opening at one end, and the flexible tube 65 is placed in the hole and sleeved in the hole The housing 61 is provided with a connecting hole. The opening angle control component of the variable grille 5 is connected to the temperature sensing unit housing 63 through the connecting hole; the elastic component 64 is placed in the temperature sensing unit housing. 63 is between the inner wall of the housing 61.

It should be noted that the temperature sensing unit housing 63 should be made of an elastic material such as rubber. For example, the flexible tube 65 may be a hose such as a hose. The opening angle control member may be a pull wire 51.

The working process of the wax type temperature controller is: when the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is less than the second preset temperature, the paraffin 66 is solid, and the cable 51 of the variable grid 5 is located at the support shell. The length of the body is the shortest, the pull wire 51 is in a relaxed state, and the rotation angle of the variable grille 5 blade is 0, that is, the variable grille 5 is completely closed; when the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is greater than or equal to the second At the preset temperature, the paraffin 66 melts into a liquid state, is compressed by the heat expansion, and the space of the tunnel is reduced, the flexible tube 65 is compressed, and the flexible tube 65 exerts a force on the ejector 62, since one end of the ejector 62 is fixed to the shell On the body 61, so under the action of the reaction force, the temperature sensing unit housing 63 will move the whole right, the compression spring member 64 generates displacement, and drives the cable to generate displacement, thereby controlling the variable grid 5 to open a certain angle; The temperature in the water outlet chamber 13 of the device 1 continues to rise, and the paraffin 66 continues to melt, and continues to drive the blades of the variable grille 5 to be turned over to be fully opened; when the temperature of the coolant in the outlet chamber 13 of the radiator 1 is less than the second preset At the temperature, at The biasing force of spring member 64, the return temperature sensing unit 63 housing, variable blade grid 5 off.

In accordance with another embodiment of the present invention, referring to FIG. 5, the actuator includes a temperature sensor 81, a stepper motor 83, and a first controller 82. The temperature sensor 81 is used to collect the temperature value of the coolant in the water outlet chamber 13 of the radiator 1, and the output end of the stepping motor 83 is connected to the opening angle control unit of the variable grid 5, and the input end of the stepping motor 83. Connected to the first controller 82, the first controller 82 is configured to receive the temperature of the coolant in the water outlet chamber 13 of the radiator 1, and control the rotation of the stepping motor 83 according to the received temperature, thereby adjusting the variable grid 5 The opening angle.

When the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is less than the second preset temperature, the first controller 82 controls the variable grid 5 to be completely closed by the stepping motor 83; when the water outlet chamber 13 of the radiator 1 is cooled When the temperature of the liquid is greater than or equal to the second preset temperature, the first controller 82 drives the blades of the variable grille 5 to be turned on by the stepping motor 83, and adjusts the angle of opening according to the collected temperature value.

Specifically, the variable grille 5 may include a first bracket, a second bracket, a plurality of blades and a rotating shaft, and the above-described grill opening angle control member. The two ends of each blade are respectively rotatably connected to the first bracket and the second bracket through a rotating shaft; the grill opening angle control member is connected to each blade.

In summary, according to the heat dissipating device for an engine according to an embodiment of the present invention, the opening angle of the variable grille 5 can be controlled according to the temperature of the coolant in the water outlet chamber 13 of the radiator 1, thereby adjusting the operating temperature of the engine and shortening the engine. The warm-up time increases the performance of the engine.

An engine cooling system according to an embodiment of the second aspect of the present invention includes a heat sink and a thermostat 7 according to the above-described first aspect of the present invention. For the specific implementation process of the heat dissipation device, refer to the above description, and details are not described herein again. Since the heat sink has the above technical effects, the engine cooling system having the heat sink also has a corresponding technical effect. Those skilled in the art will appreciate that the engine cooling system may also include an oil cooler, a condenser, an intercooler, and the like.

Referring to Fig. 6, the thermostat 7 is disposed between the water inlet chamber 12 of the radiator 1 and the cooling water passage in the engine 3. The pipe 14 is connected, and the opening temperature of the variable grille 5 in the heat sink is greater than the opening temperature of the thermostat 7. The opening temperature of the thermostat 7 is the temperature of the coolant in the engine 3 when the thermostat 7 is turned on, and the opening temperature of the variable grille 5 is the coolant in the outlet chamber 13 of the radiator 1 when the variable grille 5 is opened. temperature. In this embodiment, the opening temperature of the thermostat 7 is set to a first preset temperature, the opening temperature of the variable grid 5 is set to a second preset temperature, and the second preset temperature is greater than the first preset temperature.

When the temperature of the coolant in the engine 3 is greater than or equal to the first preset temperature, the thermostat 7 is opened, the coolant in the engine 3 flows into the radiator 1 for cooling; after the thermostat 7 is turned on, when the engine 3 dissipates heat Continue to increase, causing the coolant in the water outlet chamber 13 of the radiator 1 to continue to rise. When the temperature of the coolant in the outlet chamber 13 is greater than or equal to the second preset temperature, the actuator opens the variable grid 5 to The radiator 1 is ventilated and cooled.

Referring to FIG. 6, the engine cooling system may further include: a cooling fan 2, a collector, and a second controller. The cooling fan 2 is fixedly connected to the radiator 1; the collector is used for collecting the temperature of the coolant in the water outlet chamber 13 of the radiator 1. The collector may be a temperature sensor disposed in the water outlet chamber 13 of the radiator 1 . The second controller is configured to receive the temperature of the coolant in the radiator outlet of the radiator collected by the collector, and turn on the cooling fan 2 when the temperature of the coolant in the outlet chamber 13 of the radiator 1 is greater than or equal to the third preset temperature. The device 1 performs ventilation and heat dissipation; the third preset temperature is greater than the second preset temperature. The first preset temperature, the second preset temperature, and the third preset temperature are sequentially incremented.

It should be noted that the first preset temperature, the second preset temperature, and the third preset temperature may be determined according to specific engine conditions. For example, for a specific engine, the first preset temperature may be 85 degrees, and the second The preset temperature can be 90 degrees and the third preset temperature can be 95 degrees. The specific values of the first preset temperature, the second preset temperature, and the third preset temperature are not specifically limited.

In addition, when the actuator is the structure shown in FIG. 5, the collector and the second controller in this embodiment may be omitted, and implemented by the temperature sensor and the first controller in the actuator.

It can be seen that when the variable grid is completely opened and the temperature requirement of the engine is still not satisfied, the embodiment further turns on the cooling fan to further ventilate and dissipate the heat sink.

The invention controls the communication between the atmosphere and the nacelle by using the radiator 1 with the variable grille 5, and blocks the communication between the atmosphere and the nacelle when the water temperature is lower than the set temperature, thereby achieving the purpose of quickly warming up the engine and avoiding the engine being too cold. .

The engine cooling system of the embodiment of the present invention will be described in more detail below with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the engine cooling system includes a radiator 1, a cooling fan 2, a wax temperature controller 6, and a thermostat 7 mounted with a variable grille 5. Wherein, the wax type temperature controller 6 is disposed in the water outlet chamber 13 of the radiator 1, the cooling fan 2 is mounted on the radiator 1, and the thermostat 7 is connected to the water inlet chamber 12 of the radiator 1 and the cooling passage in the engine 3. The communication between the pipes 14 is on.

The structure of the variable grille 5 is the same as that of the blinds well known to those skilled in the art. For details, see FIG. The variable grid 5 includes a first bracket 52, a second bracket (not shown), a plurality of blades 53 and a rotating shaft 54, and a pull wire 51. The two ends of each of the blades 53 are respectively rotatably connected to the first bracket 52 and the second bracket through the rotating shaft 54. The two ends of the first bracket 52 are respectively connected to the outer walls of the water inlet chamber 12 and the water outlet chamber 13 of the radiator 1. By manipulating the pull wire 51, the opening angle of the blade 53 can be controlled. The pull wire 51 is fixedly coupled to the temperature sensing unit housing 63 in the wax type temperature controller 6. The temperature at which the temperature sensing unit housing 63 in the wax temperature controller starts to move is set higher than the opening temperature of the engine thermostat 7, and the temperature value at which the cooling fan 2 starts rotating is set higher than the temperature sensing unit housing 63 starts. The temperature during exercise.

After the engine 3 is started, since the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is very low, the variable grille 5 is completely closed, blocking the connection between the outside atmosphere and the nacelle, thereby achieving the purpose of rapid warm-up; the engine 3 water temperature rises. When the temperature is greater than or equal to the first preset temperature, after the thermostat 7 is turned on, the coolant flows through the radiator 1, and at this time, since the temperature sensing unit casing 63 is not moved, the variable grid 5 is in a closed state, the radiator 1 The heat dissipation is low, the water temperature is naturally cooled. At this time, if the engine heat dissipation does not continue to increase, this state will be maintained; if the heat dissipation of the engine 3 continues to increase, the temperature of the coolant in the water outlet chamber 13 of the radiator 1 When the temperature of the cooling in the water outlet chamber 13 is greater than or equal to the second preset temperature, the temperature value at which the temperature sensing unit casing 63 starts to move is reached, and the temperature sensing unit casing 63 starts to move, thereby driving the variable grid. 5 When a certain angle is opened, the heat dissipation amount of the radiator 1 is increased. At this time, if the heat dissipation amount of the engine is satisfied, the state will be maintained; if the amount of the engine radiator continues to increase, the variable grille 5 will be fully opened. Radiator 1 However, the heat dissipation amount is the largest, and if the heat dissipation amount of the engine 3 is satisfied, the state will be maintained; if the heat dissipation amount of the engine 3 continues to increase, the temperature of the coolant in the radiator water outlet chamber 13 also rises, when the water outlet chamber 13 When the internal coolant temperature is greater than or equal to the third preset temperature, the startup temperature of the cooling fan 2 is reached, and the cooling fan 2 is turned on to enhance the heat dissipation amount of the radiator 1.

The engine cooling system according to the embodiment of the present invention controls the atmosphere to communicate with the nacelle by adjusting the opening angle of the variable grille. In the cold north, the heat dissipation in the cabin can be controlled, thereby improving the engine warm-up time; if the engine itself The heat dissipation amount is too large, because the radiator prevents the entry of the outside cold air, the temperature in the cabin can be maintained, and the engine can be operated within a reasonable temperature range. In addition, the embodiment of the present invention can achieve the stepwise opening temperature. The engine quickly warms up and reduces the cooling fan on time, which is the purpose of reducing energy consumption. In addition, since the heat sink of the embodiment of the present invention can adjust the temperature through the variable grille, the temperature of the water can be controlled not to be too low even if the thermostat fails.

An engine cooling method according to an embodiment of the third aspect of the present invention includes the following steps:

Step S1: When the temperature of the coolant in the engine is less than the first preset temperature, the heat sink 1, the cooling fan 2, and the variable grille 5 that has been previously disposed on the heat sink are turned off.

The operator can adjust the opening angle of the variable grille through the grill opening angle control unit to adjust the engine Working temperature. In a low temperature environment, when the engine is warmed up, the operator can adjust the blades of the variable grille to completely close to ensure the operating temperature of the engine and shorten the warm-up time of the engine, especially in the cold northern regions. Obviously; after the engine is warmed up, the operator can open the angle control component by pulling the grille to fully or partially open the variable grille. In addition, in the cold northern part, when the engine is working normally, even if the radiator is turned off, the operating temperature of the engine may still be lower than the set temperature. At this time, the variable grille can be kept closed at all times to improve the engine. Work performance.

Referring to Figure 8, the engine cooling method may further comprise the following steps:

Step S2, when the temperature of the coolant in the engine is greater than or equal to the first preset temperature, the thermostat 7 is turned on, and the radiator 1 cools the coolant in the engine;

Step S3, when the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is greater than or equal to the second preset temperature, the variable grid 5 is opened;

In step S4, when the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is greater than or equal to the third preset temperature, the cooling fan 2 mounted on the radiator 1 is turned on.

Specifically, the first preset temperature, the second preset temperature, and the third preset temperature are sequentially incremented. When the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is less than the second preset temperature, the variable grid 5 is closed; when the temperature of the coolant in the outlet chamber 13 of the radiator 1 is greater than or equal to the second preset temperature , the variable grille 5 is turned on. When the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is less than the third preset temperature, the cooling fan 2 mounted on the radiator 1 is turned off; when the temperature of the coolant in the outlet chamber 13 of the radiator 1 is greater than or equal to the first At the three preset temperatures, the cooling fan 2 mounted on the radiator 1 is turned on.

After the engine 3 is started, since the temperature of the coolant in the water outlet chamber 13 of the radiator 1 is very low, the variable grid 5 is completely closed; if the water temperature of the engine 3 rises and is greater than or equal to the first preset temperature, the thermostat 7 is opened, the coolant flows through the radiator 1 for cooling; if the heat dissipation amount of the engine 3 continues to increase, the temperature of the coolant in the outlet chamber 13 of the radiator 1 will rise, and when the coolant in the outlet chamber 13 of the radiator 1 is cooled When the temperature is greater than or equal to the second preset temperature, the operator can manually operate the variable grille to fully or partially open to ventilate and dissipate the heat sink; if the heat dissipation of the engine 3 continues to increase, the coolant in the outlet of the radiator is cooled. The temperature also increases. When the temperature of the coolant in the outlet chamber is higher than the third preset temperature, the startup temperature of the cooling fan 2 is reached, and the cooling fan 2 is turned on to enhance the heat dissipation amount of the radiator 1.

Further, after the variable grid is opened in step S3, the opening angle of the variable grille can be automatically adjusted according to the temperature of the coolant in the water outlet chamber 13 of the radiator 1, thereby adjusting the working environment temperature of the engine in real time. In a specific implementation, the opening angle of the variable grille can be controlled in real time by the control device.

When the engine is warmed up, the blades of the variable grille can be completely closed to ensure the operating temperature of the engine and shorten the warm-up time of the engine, especially in the cold northern regions; the effect is more obvious when the engine needs cooling; Open, the coolant in the engine flows through the radiator, and the temperature of the coolant in the outlet of the radiator rises when the radiator When the temperature of the effluent indoor coolant is higher than the second preset temperature, the blades of the variable grille are opened to ventilate and dissipate the heat sink; if the temperature of the coolant in the effluent chamber of the radiator continues to rise at this time, Turn on the cooling fan to ventilate the heat sink.

According to the engine cooling method of the embodiment of the present invention, by setting the stepwise opening temperature, it is possible to achieve the purpose of quickly warming up the engine, reducing the opening time of the cooling fan, and reducing energy consumption.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims

A heat dissipating device for an engine, comprising:

a radiator (1) comprising a core (11), a water inlet chamber (12) and a water outlet chamber (13), the core body (11) being connected to the water inlet chamber (12) Between the water outlet chamber (13);

a variable grille (5) connected to and covering the heat sink (1), the variable grille (5) being provided with a grill opening angle control member The grill opening angle control member is for controlling the opening angle of the variable grill (5).
The heat dissipating device for an engine according to claim 1, further comprising:

An actuator that is coupled to a grill opening angle control member of the variable grill (5) for use in a coolant according to a water outlet chamber (13) of the radiator (1) The temperature controls the opening angle of the variable grid (5).
The heat sink for an engine according to claim 2, wherein the actuator comprises:

a housing (61), the housing (61) being fixed in a water outlet chamber (13) of the radiator (1);

a jack (62), the jack (62) is disposed in the housing (61), one end of the jack (62) is fixedly connected to an inner wall of the housing (61), and the other end is Free end

a temperature sensing unit housing (63), wherein the temperature sensing unit housing (63) is provided with a sealing space for sealing paraffin (66), and the temperature sensing unit housing (63) is further provided with an opening with one end open The temperature sensing unit housing (63) is coupled to the grill opening angle control member;

a flexible tube (65), the flexible tube (65) is disposed in the tunnel and sleeved outside the ejector rod (62);

An elastic member (64) is disposed between the temperature sensing unit housing (63) and an inner wall of the housing (61).
The heat sink for an engine according to claim 2, wherein the actuator comprises:

a temperature sensor (81) for collecting the temperature of the coolant in the water outlet chamber (13) of the radiator (1);

a stepping motor (83), an output end of the stepping motor (83) is connected to the grill opening angle control component;

a first controller (82), the first controller (82) is configured to receive a temperature collected by the temperature sensor (81), and control when the temperature of the received coolant is greater than or equal to a second preset temperature The stepper motor (83) rotates to control the variable grille (5) to open.
The heat sink for an engine according to any one of claims 1 to 4, characterized in that the variable grill (5) further comprises a first bracket, a second bracket, a plurality of blades and a rotating shaft, each Both ends of the blade pass through The shaft is rotatably coupled to the first bracket and the second bracket, and the grill opening angle control member is coupled to each of the vanes.
An engine cooling system, comprising:

Thermostat (7); and

The heat sink according to any one of claims 1 to 5, wherein the thermostat (7) is provided in a water inlet chamber (12) of the radiator (1) and a cooling passage in the engine The communication duct (14) is connected to each other, and the opening temperature of the variable grid (5) in the heat sink is greater than the opening temperature of the thermostat (7).
The engine cooling system of claim 6 further comprising:

a cooling fan (2), the cooling fan (2) is fixed on the heat sink (1);

a collector for collecting the temperature of the coolant in the water outlet chamber (13) of the radiator (1);

a second controller, the second controller is configured to receive a temperature of the coolant in the water outlet chamber (13), and open when the temperature of the coolant in the water outlet chamber (13) is greater than or equal to a third preset temperature The cooling fan (2).
An engine cooling method for cooling the engine using the engine cooling system of claim 6 or 7, wherein the engine cooling method comprises the following steps:

When the temperature of the coolant in the engine is less than the first preset temperature, the thermostat (7), the cooling fan (2), and the variable grill (5) that has been previously disposed on the radiator (1) are turned off.
The engine cooling method according to claim 8, further comprising the steps of:

When the temperature of the coolant in the engine is greater than or equal to the first preset temperature, the thermostat (7) is turned on;

When the temperature of the coolant in the water outlet chamber (13) of the radiator (1) is greater than or equal to the second preset temperature, the variable grid (5) is opened;

When the temperature of the coolant in the water outlet chamber (13) of the radiator (1) is greater than or equal to the third preset temperature, the cooling fan (2) mounted on the radiator (1) is turned on;

The first preset temperature, the second preset temperature, and the third preset temperature are sequentially incremented.
The engine cooling method according to claim 9, wherein when the temperature of the coolant in the water outlet chamber (13) of the radiator (1) is greater than or equal to the second preset temperature, the variable grid step is opened. Also includes:

The opening angle of the variable grid (5) is controlled according to the temperature of the coolant in the water outlet chamber (13) of the radiator (1).