KR20200048578A - Cooling system for engine - Google Patents

Abstract

The present invention relates to an engine cooling apparatus which improves engine performance by separately cooling a cylinder head, an upper portion of a cylinder block, and a lower portion of the cylinder block. According to an embodiment of the present invention, an engine cooling apparatus may comprise: a water pump which pumps coolant so that a coolant circulates while cooling an engine; a water jacket which is a passage of the coolant formed in an upper portion of a cylinder block of the engine and a cylinder head of the engine; a water chamber which is a passage of the coolant provided at a lower portion of the cylinder block; an integrated flow control valve which changes a circulation path of the coolant so that the coolant passes through one or both of the water jacket and the water chamber; and a controller for controlling the operation of the integrated flow control valve.

Description

Engine cooling system {COOLING SYSTEM FOR ENGINE}

The present invention relates to an engine cooling device, and more particularly, to an engine cooling device for separating and cooling the upper and lower parts of a cylinder block.

In general, heat generated in the combustion chamber of the engine is absorbed by a cylinder head, a cylinder block, an intake / exhaust valve, and a piston, and a water jacket through which coolant passes to cool the engine mainly blocks the cylinder to circulate the coolant in the vertical direction of the engine. And a cylinder head.

When heat is absorbed by the components of the engine and the temperature is excessively increased, thermal deformation may occur, or an oil film on the inner wall of the cylinder may be destroyed, resulting in poor lubrication. Accordingly, an engine failure may occur, and the engine failure may cause abnormal combustion such as defective combustion, knocking, or preignition. Such abnormal combustion may damage the piston, and there is a problem of lowering the thermal efficiency and power of the engine. Conversely, excessive cooling of the engine causes problems such as deterioration of power and fuel consumption and low temperature wear of the cylinder. Therefore, the cooling of the engine by cooling water needs to be properly controlled.

However, when using a cooling method that circulates the cooling water in the vertical direction of the engine through the water jacket, the complex shape of the water jacket acts as a resistance to the flow of the cooling water, and uniform cooling of various cylinders of the engine is not easy. Accordingly, cooling efficiency may be reduced.

On the other hand, since the cylinder block has a lower surface temperature than the cylinder head, and the temperature of the coolant is slow after the engine starts, a method for preparing for deterioration of fuel efficiency and performance caused by a warm-up delay is required.

Therefore, the present invention was created to solve the above problems, and an object of the present invention is to provide a cooling device for an engine that improves engine performance by separating and cooling the cylinder head, the upper part of the cylinder block, and the lower part of the cylinder block. Is to provide.

An engine cooling apparatus according to an embodiment of the present invention for achieving the above object is formed in a water pump for pumping coolant to circulate while cooling water cools the engine, and formed at the top of the cylinder block of the engine and the cylinder head of the engine Integration of changing the circulation path of the cooling water so that the cooling water passes through one or both of the water jacket and the water chamber, and the water jacket which is a passage of the cooling water provided in the lower portion of the cylinder block and the cooling water passage provided in the lower part of the cylinder block It may include a flow control valve, and a controller that controls the operation of the integrated flow control valve.

An engine cooling apparatus according to an embodiment of the present invention flows cooling water to one side of the engine, communicates with the water chamber, and the inlet line in which the water pump is disposed, and the water pump at a position close to the inlet line After passing through, the first communication path communicating the water jacket with the branch path branched from the inflow line before communicating with the water chamber, and flowing cooling water to the other side of the engine, the upper end of the cylinder head A first outlet line communicating the water jacket and the integrated flow control valve, and a second outlet line flowing the cooling water to the other side of the engine, and communicating the water jacket and the integrated flow control valve at the lower end of the cylinder head. It may further include.

The engine cooling apparatus according to an embodiment of the present invention flows cooling water to the other side of the engine, and a third outlet line communicating the water chamber and the integrated flow control valve, and the first, second, and third outlet lines The second flow path communicating the branch path and the water jacket at a position close to the, and the integrated flow control valve communicates with the inlet line so as to circulate the cooling water via the integrated flow control valve to the engine. A first circulation line in which an oil cooler for cooling engine oil by heat exchange with is disposed, and the integrated flow control valve and the inlet line to circulate cooling water through the integrated flow control valve to the engine, A second circulation line in which a radiator for dissipating the heat of the cooling water into the air and a cooling water via the integrated flow control valve are circulated to the engine A third circulation line communicating with the integrated flow control valve and the inflow line, and having a low pressure exhaust gas recirculation cooler for cooling recirculated exhaust gas by heat exchange with cooling water and a heater using cooling water as a heat source, and the integrated flow rate Further comprising a fourth circulation line that communicates the first circulation line and the inlet line to circulate the cooling water through the control valve to the engine, and a reservoir tank for receiving or supplementing the cooling water so that the cooling water is circulated smoothly. can do.

The integrated flow control valve includes a first valve selectively opening and closing the second outlet line communicating with the integrated flow control valve, and a second valve selectively opening and closing the third outlet line communicating with the integrated flow control valve. And a third valve selectively opening and closing the second circulation line communicating with the integrated flow control valve, and a fourth valve selectively opening and closing the third circulation line communicating with the integrated flow control valve. Can be.

The first valve, the second valve, the third valve, and the fourth valve may be controlled by the controller to open and close each independently.

The cooling device of the engine according to an embodiment of the present invention may further include a temperature sensor provided in the cylinder block and the integrated flow control valve to sense the temperature of the cooling water.

The controller closes the first valve, the second valve, the third valve, and the fourth valve in a cold state of the engine according to the temperature information of the coolant received from the temperature sensor, and the controller coolant When the temperature of is less than the first set temperature, the engine is determined to be in a cold state, and the first set temperature may be set to a case where the temperature of the cooling water passing through the cylinder head is 50 ° C.

The controller closes the first valve, the second valve, and the third valve in the low temperature state of the engine according to the temperature information of the coolant received from the temperature sensor, opens the fourth valve, and the controller When the temperature of the cooling water is above the first set temperature and below the second set temperature, it is determined that the engine is in a low temperature state, and the first set temperature is when the temperature of the coolant passing through the cylinder head is 50 ° C. It is set, and the second set temperature may be set when the temperature of the cooling water passing through the cylinder head is 90 ° C.

The controller closes the first valve and the second valve when the temperature of the coolant is high in the low temperature condition range of the engine according to the temperature information of the coolant received from the temperature sensor, and closes the third valve and the When the fourth valve is opened, the controller determines that the temperature of the coolant is high in the low temperature condition category when the temperature of the coolant is greater than or equal to the second set temperature and less than the third set temperature. 3 The set temperature may be set when the temperature of the coolant passing through the cylinder block is 105 ° C.

The controller closes the second valve, opens the first valve, the third valve, and the fourth valve in a hot and low temperature state of the engine according to the temperature information of the coolant received from the temperature sensor, and the The controller determines that the engine is in a hot and low temperature state when the temperature of the coolant is greater than or equal to the third set temperature, and is less than the fourth set temperature, and the third set temperature is 105 ° C of the coolant passing through the cylinder block. The case may be set, and the fourth set temperature may be set when the temperature of the coolant passing through the cylinder block is 115 ° C.

The controller opens all of the first valve, the second valve, the third valve, and the fourth valve in a hot and high temperature state of the engine according to the temperature information of the coolant received from the temperature sensor, and the controller When the temperature of the coolant is greater than or equal to the fourth set temperature, the engine is determined to be in a hot high temperature state, and the fourth set temperature may be set to a case where the coolant temperature passing through the cylinder block is 115 ° C.

The engine cooling apparatus according to an embodiment of the present invention further includes a temperature sensor provided in the cylinder block and the integrated flow control valve to sense the temperature of the coolant, and to transmit the detected temperature information of the coolant to the controller. can do.

The controller closes the first valve, the second valve, the third valve, and the fourth valve when the temperature of the delivered cooling water is less than the first set temperature, and the temperature of the delivered cooling water is the first When the temperature is greater than or equal to 1 set temperature and less than the second set temperature, the first valve, the second valve, and the third valve are closed, the fourth valve is opened, and the temperature of the delivered cooling water is the second setting. When the temperature is above and below the third set temperature, the first valve and the second valve are closed, the third valve and the fourth valve are opened, and the temperature of the delivered cooling water is above the third set temperature , If the second valve is closed when the temperature is lower than the fourth set temperature, the first valve, the third valve, and the fourth valve are opened, and the temperature of the delivered cooling water is greater than or equal to the fourth set temperature First valve, above The two valves, the third valve, and the fourth valve are all opened, but the first set temperature is set to a case where the temperature of the coolant passing through the cylinder head is 50 ° C., and the second set temperature is the cylinder. The temperature of the cooling water passing through the head is set to 90 ° C, the third set temperature is set to the temperature of the cooling water passing through the cylinder block is 105 ° C, and the fourth set temperature is set to the cylinder block. The temperature of the cooling water passing through may be set to 115 ° C.

The water chamber may be formed of an insulating material.

The water chamber may have a larger volume than the water jacket.

A heat insulating material may be coated on the surface of the water chamber.

As described above, according to an embodiment of the present invention, the upper portion of the cylinder head and the cylinder block is cooled using a water jacket, and the lower portion of the cylinder block is cooled using a water chamber, so that efficient cooling of the engine can be realized. . Thus, ultimately, the performance of the engine can be improved.

1 is a block diagram of an engine cooling apparatus according to an embodiment of the present invention.
2 is a cross-sectional view of a cylinder block of an engine according to an embodiment of the present invention.
3 is a view showing the circulation of the cooling water in the cold state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.
4 and 5 is a view showing the circulation of the cooling water in a low temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.
6 is a view showing the circulation of cooling water in a hot and low temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.
7 is a view showing the circulation of cooling water in a hot and high temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an engine cooling apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a cylinder block of an engine according to an embodiment of the present invention.

As shown in Figure 1, the engine cooling apparatus 1 according to the embodiment of the present invention, the engine 10, the cylinder head 11, the cylinder block 13, the water jacket 15, the water chamber 17 ), Water pump 20, oil cooler 22, reservoir tank 24, low pressure exhaust gas recirculation cooler 26, heater 28, radiator 29, integrated flow control valve 30, first valve (32), second valve (34), third valve (36), fourth valve (38), inlet line (41), first outlet line (42), second outlet line (43), third outlet It includes a line 44, a first circulation line 45, a second circulation line 46, a third circulation line 47, and a fourth circulation line 48.

The cylinder head 11 is a head portion of the engine 10, where airtightness and watertightness are maintained to obtain thermal energy. Inside the cylinder head 11, a piston (not shown) and a combustion chamber (not shown) surrounded by the cylinder head 11 are formed, and in the combustion chamber, a spark plug to convert thermal energy into kinetic energy of the piston, An intake valve and an exhaust valve are provided.

The cylinder block 13 is a central portion of the engine 10 and is coupled to the lower side of the cylinder head 11. Here, a gasket 19 may be interposed between the cylinder head 11 and the cylinder block 13 to ensure airtightness and watertightness. In addition, at least one block bore 13c, that is, a normal cylinder is formed in the cylinder block 13, and the piston is arranged to be able to reciprocate up and down inside the block bore 13c (see FIG. 2). ).

Since the engine 10 constituted by the combination of the cylinder head 11 and the cylinder block 13 is obvious to those having knowledge of frostbite (hereinafter, those skilled in the art) in the art, detailed descriptions thereof will be omitted. .

The water jacket 15 is an empty space formed by disposing a core in a mold during casting of the cylinder block 13 and the cylinder head 11, and around the block bore 13c including the combustion chamber It is the passage of the cooling water arranged in (see Fig. 2). That is, the water jacket 15 is formed on the cylinder block 13 and the cylinder head 11. Referring to FIG. 2, a water jacket 15 according to an embodiment of the present invention formed on the cylinder block 13 is formed on the upper portion U of the cylinder block 13. Here, the water jacket 15 formed on the cylinder block 13 is preferably formed only up to the phase P of the piston ring when the piston is located at the top dead center, which is approximately 70% water jacket compared to the prior art It is deleted. Therefore, the volume of the core disposed in the mold during casting of the cylinder block 13 and the cylinder head 11 is reduced, and the casting process of the cylinder block 13 and the cylinder head 11 can be simplified. . The phase P of the piston ring and the formation range of the water jacket 15 can be variously changed according to the design of a person skilled in the art.

The water chamber 17 is a passage of cooling water disposed around the block bore 13c under the water jacket 15. That is, the water chamber 17 is formed or provided in the cylinder block 13. In addition, the water chamber 17 functions as a chamber having a larger volume per unit length than the water jacket 15 to temporarily store cooling water. In other words, the water chamber 17 has a large cross-sectional area to allow more cooling water to pass through than the water jacket 15. Referring to Figure 2, the water chamber 17 is disposed on the lower portion (L) of the cylinder block 13, is formed of a heat insulating material (17a) or is coated on the outer or inner surface of the insulating material (17a). Therefore, the thermal conductivity between the cooling water passing through the water chamber 17 and the lower part L of the cylinder block 13 is determined by the cooling water passing through the water jacket 15 and the cylinder block 13. It is lower than the thermal conductivity between the upper part U and the cylinder head 11.

In this way, compared to the water jacket 15, the water chamber 17 having a large volume and low thermal conductivity is disposed, thereby preventing excessive cooling of the lower portion L of the cylinder block 13 and at the same time the water jacket 15 ) Cooling performance using the cooling water passing through is guaranteed, so that overheating of the upper part U of the cylinder block 13 and the cylinder head 11 is prevented. Therefore, it is prevented that the cooling water becomes excessively low when the engine 10 is idle and stopped, and excessive cooling of the lower portion L of the cylinder block 13 is prevented when the engine 10 is restarted. ) Can be warmed up quickly.

The water pump 20 is a device for pumping cooling water so that the cooling water is circulated in the cooling device 1 of the engine. In addition, the water pump 20 is selectively applied depending on the type of electronic or mechanical vehicle. Furthermore, the water pump 20 in the cooling device 1 of the engine according to the embodiment of the present invention is not limited to either electronic or mechanical.

The oil cooler 22 is a device that cools the engine oil to maintain the proper temperature. In addition, the oil cooler 22 is an air-cooled type in which heat exchange between air and engine oil is implemented, a water-cooled type in which heat exchange between coolant and engine oil is implemented, or an air-cooled type in which both types of heat exchange are implemented depending on the vehicle. do. Further, in the engine cooling apparatus 1 according to the embodiment of the present invention, the oil cooler 22 may be water-cooled or air-cooled.

The reservoir tank 24 is a device for compensating for the volume of the liquid according to the temperature change, and is a device that accommodates or supplements cooling water so that the cooling water is circulated smoothly in the cooling device 1 of the engine.

The low pressure exhaust gas recirculation cooler 26 is a device for cooling the recirculation exhaust gas returning to the combustion chamber. In addition, the low pressure exhaust gas recirculation cooler 26 uses cooling water for cooling the recirculation exhaust gas. In other words, the cooling method of the low pressure exhaust gas recirculation cooler 26 may also be water-cooled or air-cooled.

The heater 28 is a device for indoor heating of a vehicle that uses high-temperature cooling water via the engine 10 as a heat source.

The radiator 29 is a device that discharges heat of high-temperature coolant passing through the engine 10 into the air.

The basic configuration and functions of the water pump 20, the oil cooler 22, the reservoir tank 24, the low pressure exhaust gas recirculation cooler 26, the heater 28, and the radiator 29 are obvious to those skilled in the art. Detailed description will be omitted.

The integrated flow control valve 30 is a portion of the coolant is the oil cooler 22, the reservoir tank 24, the low pressure exhaust gas recirculation cooler 26, the heater 28, and the radiator 29 or The circulation path of the cooling water is changed to selectively pass through the whole.

The first valve 32, the second valve 34, the third valve 36, and the fourth valve 38 are built in the integrated flow control valve 30, each passage of cooling water 43 , 44, 46, 47).

The inflow line 41 is a passage through which coolant flows into the engine 10 and is connected to the cylinder block 13 of the engine 10. In addition, the inflow line 41 communicates with the water chamber 17 disposed in the cylinder block 13. Furthermore, the water pump 20 is provided on the inflow line 41. Furthermore, the inlet line 41 is branched before communicating with the water chamber 17 after passing through the water pump 20, and this branched passage will be referred to as a branch path 12. On the other hand, the branch path 12 is provided inside the cylinder block 13, the water jacket (1) through the first communication path 14 and the second communication path 18 within the cylinder block 13 15). Here, the inflow line 41, the branch path 12, the first communication path 14, and the second communication path 18 may be always open.

The first communication path 14 communicates with the water jacket 15 at a position close to the inflow line 41, and the second communication path 18 is the first, second, and third outflow lines 42, 43, 44) in communication with the water jacket 15. Here, the first, second, and third outlet lines 42 may be connected to the engine 10 on one side and the opposite side of the engine 10 to which the inlet line 41 is connected.

The first outlet line 42 is a passage through which coolant flows from the engine 10 and is connected to the cylinder head 11 of the engine 10. In addition, the first outlet line 42 is in communication with the water jacket 15 disposed on the cylinder head 11. Here, the first outlet line 42 may be connected to the upper end of the cylinder head (11). Furthermore, the first outlet line 42 communicates the water jacket 15 and the integrated flow control valve 30. Here, the first outlet line 42 may be open at all times.

The second outlet line 43 is a passage through which coolant flows from the engine 10, and is connected to the cylinder head 11 of the engine 10. In addition, the second outlet line 43 is in communication with the water jacket 15 disposed on the cylinder head 11. Here, the second outlet line 43 may be connected to the lower end of the cylinder head 11. Furthermore, the second outlet line 43 communicates the water jacket 15 and the integrated flow control valve 30. Here, the first valve 32 is mounted to the integrated flow control valve 30 to selectively open and close the second outlet line 43 communicating with the integrated flow control valve 30.

The third outlet line 44 is a passage through which coolant flows from the engine 10 and is connected to the cylinder block 13 of the engine 10. In addition, the third outlet line 44 is in communication with the water chamber 17 disposed in the cylinder block 13. Furthermore, the third outlet line 44 communicates the water chamber 17 and the integrated flow control valve 30. Here, the second valve 34 is mounted to the integrated flow control valve 30 to selectively open and close the third outlet line 44 communicating with the integrated flow control valve 30.

The first circulation line 45 is a passage for circulating the cooling water passing through the integrated flow control valve 30 to the engine 10, and communicating the integrated flow control valve 30 and the inflow line 41. . In addition, the oil cooler 22 is provided on the first circulation line 45. That is, the coolant flowing out of the integrated flow control valve 30 and passing through the first circulation line 45 flows into the inflow line 41 via the oil cooler 22. Here, the first circulation line 45 may be always open.

The second circulation line 46 is a passage for circulating the cooling water passing through the integrated flow control valve 30 to the engine 10, and communicating the integrated flow control valve 30 and the inflow line 41. . In addition, the radiator 29 is provided on the second circulation line 46. That is, the coolant flowing out of the integrated flow control valve 30 and passing through the second circulation line 46 flows into the inflow line 41 via the radiator 29. Here, the third valve 36 is mounted on the integrated flow control valve 30 to selectively open and close the second circulation line 46 communicated with the integrated flow control valve 30.

The third circulation line 47 is a passage for circulating the cooling water passing through the integrated flow control valve 30 to the engine 10, and communicating the integrated flow control valve 30 and the inflow line 41. . In addition, the low pressure exhaust gas recirculation cooler 26 and the heater 28 are provided on the third circulation line 47. That is, the coolant that flows out of the integrated flow control valve 30 and passes through the third circulation line 47 passes through the heater 28 and the low pressure exhaust gas recirculation cooler 26 sequentially, and the inflow line ( 41). Here, the fourth valve 38 is mounted to the integrated flow control valve 30 to selectively open and close the third circulation line 47 communicating with the integrated flow control valve 30.

The fourth circulation line 48 is a passage for circulating coolant passing through the integrated flow control valve 30 to the engine 10, branching from the first circulation line 45 to the inlet line 41 Communicate. In addition, the reservoir tank 24 is provided on the fourth circulation line 48. That is, some of the coolant flowing out of the integrated flow control valve 30 and flowing into the first circulation line 45 passes through the fourth circulation line 48 while passing through the reservoir tank 24. It flows into the line 41. Furthermore, the fourth circulation line 48 is branched from the first circulation line 45 between the integrated flow control valve 30 and the radiator 29, and flows into the first circulation line 45 The cooled water is partially passed through the fourth circulation line 48 before it enters the radiator 29. Here, the fourth circulation line 48 branched from the first circulation line 45 may be open at all times.

Hereinafter, operation and control of the cooling device 1 of the engine according to an embodiment of the present invention will be described with reference to FIGS. 3 to 7. Meanwhile, in FIGS. 3 to 7, a passage through which cooling water circulates is illustrated by a solid line, and a passage through which cooling water is not circulated is illustrated by a dotted line.

The operation of the cooling device 1 of the engine is implemented by the control of the controller 60, the controller 60 is the integrated flow rate according to the temperature information received from the temperature sensor 50 for sensing the temperature of the coolant By controlling the control valve 30, the operation of the cooling device 1 of the engine is realized. In addition, the first valve 32, the second valve 34, the third valve 36, and the fourth valve 38 of the integrated flow control valve 30 are controlled to be opened and closed, respectively, so that the engine ( The circulation of different cooling waters is realized according to the four states of 10). Here, the four states of the engine 10 may be divided into a cold state, a low temperature state, a hot low temperature state, and a hot high temperature state according to the order in which the temperature of the coolant is increased, but is not limited thereto.

The controller 60 may be a general electronic control unit (ECU) that controls the control of electronic devices in the vehicle, and the integrated flow control valve 30 may be an electronic device. Concepts such as the cold state of the engine, the hot state, and the ECU is obvious to those skilled in the art, so a detailed description thereof will be omitted.

3 is a view showing the circulation of the cooling water in the cold state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.

1, the temperature sensor 50 is provided on the cylinder block 13 and the integrated flow control valve 30, respectively. In addition, the controller 60 is connected to the temperature sensor 50 to receive the temperature information of the cooling water, and the integrated flow rate to control the first, 2, 3, 4 valves (32, 34, 36, 38) It is connected to the control valve (30).

3, the first valve 32, the second valve 34, the agent by the control of the controller 60 according to the temperature information of the cooling water received from the temperature sensor 50 When the third valve 36 and the fourth valve 38 are both closed, the first valve 32 blocks the flow of cooling water passing through the second outlet line 43, and the second valve (34) blocks the flow of cooling water passing through the third outlet line (44), and the third valve (36) blocks the flow of cooling water passing through the second circulation line (46). 4 The valve 38 flows into the cylinder block 13 through the inflow line 41 by pumping the water pump 20 by blocking the flow of cooling water passing through the third circulation line 47. The cooled water is the branch path 12 which is always open, the first communication path 14 which is always open, the water jacket 15, and the constant opening. The oil cooler provided on the first circulation line 45 while sequentially passing through the first outlet line 42, the integrated flow control valve 30, and the first circulation line 45 that are always open. It is circulated to flow back into the inflow line 41 via (22).

The circulation of the cooling water through the always open cooling water line is referred to as zero flow, and control to implement the flow stop minimizes the cooling of the cylinder block 13 in the cold state of the engine 10 to minimize the engine ( 10) is performed to speed up the warm-up.

On the other hand, the temperature of the cooling water, which is the upper limit for determining the cold state of the engine 10, will be referred to as a first set temperature T1, and when the temperature of the coolant is less than the first set temperature T1, It is determined that the engine 10 is in a cold state. In other words, the controller 60 determines whether the temperature of the cooling water received from the temperature sensor 50 is equal to or greater than the first set temperature T1, and when the abnormality is not abnormal, the first valve 32 and the agent The two valves 34, the third valve 36, and the fourth valve 38 are all closed. Here, the first set temperature (T1) may be preferably set to a case where the temperature of the cooling water passing through the cylinder head 11 is 50 ° C.

4 and 5 is a view showing the circulation of the cooling water in a low temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.

As illustrated in FIG. 4, when the temperature of the cooling water received from the controller 60 by the controller 60 is greater than or equal to the first set temperature T1, the first valve is controlled by the controller 60. (32), when the second valve 34 and the third valve 36 are closed and the fourth valve 38 is opened, the first valve 32 is the second outlet line ( 43) to block the flow of coolant passing through, the second valve (34) to block the flow of coolant passing through the third outlet line (44), and the third valve (36) to circulate the second By blocking the flow of the cooling water passing through the line 46, the fourth valve 38 flows the cooling water into the third circulation line 47, so that the inflow line (by the pumping of the water pump 20) 41) is introduced into the cylinder block 13 through the always open branch path 12, the always open first communication path 14, the The water jacket 15, the first outlet line 42 that is always open, and the cooling water sequentially passing through the integrated flow control valve 30 pass through the first circulation line 45 that is always open. 1 through the oil cooler 22 provided on the circulation line 45 to circulate again to flow into the inflow line 41 and at the same time passing through the open third circulation line 47, the third circulation The heater 28 provided on the line 47 and the low pressure exhaust gas recirculation cooler 26 are sequentially circulated to flow back into the inflow line 41.

The control for implementing the circulation of the cooling water is performed to optimally distribute the flow rate of the cooling water to the heater 28 and the low-pressure exhaust gas recirculation cooler 26 in the low temperature state of the engine 10.

On the other hand, the temperature of the cooling water, which is the upper limit for determining the low temperature state of the engine 10, is referred to as a second set temperature T2, and the temperature of the coolant is equal to or greater than the first set temperature T1, When the temperature is lower than the second set temperature T2, it is determined that the engine 10 is in a low temperature state. In other words, when the temperature of the cooling water received from the temperature sensor 50 is greater than or equal to the first set temperature T1, the controller 60 opens only the fourth valve 38, and then the temperature of the cooling water is the If it is determined that the second set temperature T2 or higher is not abnormal, the first valve 32, the second valve 34, and the third valve 36 are closed, and the fourth valve ( 38) remains open. Here, the second set temperature (T2) may be preferably set to a case where the temperature of the cooling water passing through the cylinder head 11 is 90 ° C.

As illustrated in FIG. 5, when the temperature of the coolant in the low temperature condition range of the engine 10 is equal to or higher than the second set temperature T2, the third valve in the state in which only the fourth valve 38 is opened 36 can be further opened. As such, the control in which the first valve 32 and the second valve 34 are closed and the third valve 36 and the fourth valve 38 are opened is within the low temperature condition range of the engine 10. It is performed when the temperature of the cooling water is high, and the temperature of the cooling water, which is the upper limit for determining the state, will be referred to as a third set temperature T3. That is, when the temperature of the cooling water is greater than or equal to the second set temperature T2 and less than the third set temperature T3, the first valve 32 and the second valve 34 are closed, and the third The valve 36 and the fourth valve 38 are opened. Here, the third set temperature (T3) may be preferably set to a case where the temperature of the cooling water passing through the cylinder block 13 is 105 ° C.

6 is a view showing the circulation of cooling water in a hot and low temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.

As shown in FIG. 6, when the temperature of the cooling water received from the controller 60 by the controller 60 is greater than or equal to the third set temperature T3, the second valve is controlled by the controller 60. When the 34 is closed, and the first valve 32, the third valve 36, and the fourth valve 38 are opened, the first valve 32 is the second outlet line ( 43) flows cooling water to the integrated flow control valve (30), the second valve (34) blocks the flow of cooling water passing through the third outlet line (44), and the third valve (36). ) Flows the cooling water into the second circulation line 46, and the fourth valve 38 flows the cooling water into the third circulation line 47, whereby the water pump 20 pumps the inflow. Through the line 41, the always open branch path 12, the always open first and second communication paths 14, 18, and the water jacket 15 The cooling water that has been sequentially passed through the integrated flow control valve 30 through the first outflow line 42 and the second open outflow line 43 that is always open is first circulated afterwards. As it passes through the line 45, it circulates to flow back into the inflow line 41 via the oil cooler 22 provided on the first circulation line 45, and the open third circulation line 47 ) While passing through the heater 28 and the low pressure exhaust gas recirculation cooler 26 provided on the third circulation line 47 in order to circulate again to enter the inlet line 41 at the same time. While passing through the opened second circulation line 46, the second circulation line 46 is circulated to flow back into the inflow line 41 via the radiator 29 provided on the second circulation line 46, and the second circulation The fourth circulation line 48 branched from the line 46 And with cycles such that by way of the reservoir tank 24 flows back to the inlet line 41 that is provided on the fourth circulating line (48).

The control for implementing the circulation of the cooling water is performed to optimally distribute the flow rate of the cooling water to the radiator 29 in the hot and low temperature state of the engine 10. In addition, the first valve 32 and the second valve 34 are closed when the temperature of the coolant is high within the low temperature condition range of the engine 10, and the third valve 36 and the fourth Even in the control in which the valve 38 is opened, the flow rate of the cooling water is distributed to the radiator 29 (see FIG. 5), but in the hot and low temperature state of the engine 10, the cylinder by the cooling water passing through the water jacket 15 The first valve 32 is further opened so that cooling of the head 11 is maximized.

On the other hand, the temperature of the cooling water, which is the upper limit for determining the hot and low temperature state of the engine 10, is referred to as a fourth set temperature T4, and the temperature of the coolant is equal to or greater than the third set temperature T3, When the temperature is below the fourth set temperature T4, it is determined that the engine 10 is in a hot and low temperature state. In other words, the controller 60 closes the first valve 32 and the second valve 34 when the temperature of the cooling water received from the temperature sensor 50 is greater than or equal to the third set temperature T3. After the third valve 36 and the fourth valve 38 are opened, the first valve 32 is further opened, and whether the temperature of the cooling water is equal to or greater than the fourth set temperature T4. If it is determined that there is no abnormality, the second valve 34 is closed, and the first valve 32, the third valve 36, and the fourth valve 38 remain open. Here, the fourth set temperature T4 may be preferably set to a case where the temperature of the cooling water passing through the cylinder block 13 is 115 ° C.

7 is a view showing the circulation of cooling water in a hot and high temperature state of the engine implemented by the cooling device of the engine according to an embodiment of the present invention.

As illustrated in FIG. 7, when the temperature of the cooling water received from the controller 60 by the controller 60 is greater than or equal to the fourth set temperature T4, the first valve is controlled by the controller 60. (32), when the second valve (34), the third valve (36), and the fourth valve (38) are all open, the first valve (32) is the second outlet line (43) Cooling water flows into the integrated flow control valve 30 through, and the second valve 34 flows cooling water into the integrated flow control valve 30 through the third outlet line 44. 3 valve 36 flows cooling water into the second circulation line 46, and the fourth valve 38 flows cooling water into the third circulation line 47. At this time, the circulation of the cooling water flowing out from the integrated flow control valve 30 is the second valve 34 described in FIG. 6 closed, the first valve 32, the third valve 36, and This is the same as when the fourth valve 38 is opened. On the other hand, the first valve 32, the second valve 34, the third valve 36, and the fourth valve 38 are all opened to control the cooling water to be circulated to control the engine 10. It is performed so that the cooling of the cylinder block 13 by the cooling water passing through the water chamber 17 in accordance with the opening of the second valve 34 in the hot and high temperature state of the maximized.

As described above, according to the embodiment of the present invention, the cylinder head 11 and the upper portion U of the cylinder block 13 are cooled using a water jacket 15, and the lower portion L of the cylinder block 13 By cooling using the water chamber 17, efficient cooling of the engine 10 can be realized. Therefore, ultimately, the performance of the engine 10 can be improved.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and is easily changed and equalized by those skilled in the art from the embodiments of the present invention. Includes all changes to the extent deemed acceptable.

1: Cooling system
10: engine 11: cylinder head
12: branch road 13: cylinder block
13c: Block Bore 14: No. 1 communication path
15: water jacket 17: water chamber
17a: insulating material 18: second communication path
19: gasket
20: water pump 22: oil cooler
24: reservoir tank 26: low pressure exhaust gas recirculation cooler
28: heater 29: radiator
30: integrated flow control valve 32: first valve
34: second valve 36: third valve
38: fourth valve
41: inflow line 42: first outflow line
43: second outflow line 44: third outflow line
45: first circulation line 46: second circulation line
47: third circulation line 48: fourth circulation line
50: temperature sensor 60: controller
L: Cylinder block bottom P: Piston ring phase
U: Upper cylinder block

Claims (19)

A water pump that pumps the coolant so that the coolant circulates while cooling the engine;
A water jacket that is a passage of coolant formed in an upper portion of the cylinder block of the engine and a cylinder head of the engine;
A water chamber that is a passage of cooling water provided in a lower portion of the cylinder block;
An integrated flow control valve that changes a circulation path of the cooling water so that the cooling water passes through one or both of the water jacket and the water chamber; And
A controller that controls the operation of the integrated flow control valve;
Cooling system of the engine comprising a. According to claim 1,
An inflow line for introducing cooling water to one side of the engine, communicating with the water chamber, and in which the water pump is disposed;
A first communication path communicating the water jacket with a branching branch branched from the inflow line before communicating with the water chamber after passing through the water pump at a position close to the inflow line;
A first outlet line that discharges cooling water to the other side of the engine and communicates the water jacket and the integrated flow control valve at an upper end of the cylinder head; And
A second outlet line that discharges cooling water to the other side of the engine and communicates the water jacket and the integrated flow control valve at a lower end of the cylinder head;
Cooling apparatus of the engine further comprising. According to claim 2,
A third outlet line that discharges cooling water to the other side of the engine and communicates with the water chamber and the integrated flow control valve;
A second communication path communicating the branch jacket and the water jacket at a position close to the first, second, and third outflow lines;
A first circulation line communicating the integrated flow control valve and the inflow line so as to circulate the cooling water passing through the integrated flow control valve to the engine, and an oil cooler for cooling the engine oil by heat exchange with the cooling water;
A second circulation line communicating the integrated flow control valve and the inflow line so as to circulate the cooling water passing through the integrated flow control valve to the engine, and a radiator discharging heat of the cooling water into the air;
A low-pressure exhaust gas recirculation cooler and cooling water that communicates the integrated flow control valve and the inflow line so as to circulate the cooling water through the integrated flow control valve to the engine and cools the recirculated exhaust gas by heat exchange with the cooling water as a heat source. A third circulation line in which a heater to be placed is disposed; And
A fourth circulation line that communicates the first circulation line and the inflow line so as to circulate the cooling water passing through the integrated flow control valve to the engine, and a reservoir tank for receiving or supplementing cooling water so that the cooling water is circulated smoothly ;
Cooling apparatus of the engine further comprising. According to claim 3,
The integrated flow control valve,
A first valve selectively opening and closing the second outlet line communicating with the integrated flow control valve;
A second valve selectively opening and closing the third outlet line communicating with the integrated flow control valve;
A third valve selectively opening and closing the second circulation line communicating with the integrated flow control valve; And
A fourth valve selectively opening and closing the third circulation line communicating with the integrated flow control valve;
Including,
The first valve, the second valve, the third valve, and the fourth valve are each the cooling device of the engine, characterized in that controlled by the controller to open and close independently. The method of claim 4,
Each of the cylinder block and the integrated flow control valve is further provided with a temperature sensor for sensing the temperature of the cooling water,
The controller closes the first valve, the second valve, the third valve, and the fourth valve in a cold state of the engine according to the temperature information of the coolant received from the temperature sensor. Cooling system. The method of claim 5,
And the controller determines that the engine is in a cold state when the temperature of the coolant is less than the first set temperature. The method of claim 6,
The first set temperature is the cooling device of the engine, characterized in that the temperature of the cooling water passing through the cylinder head is set to 50 ℃. The method of claim 4,
Each of the cylinder block and the integrated flow control valve is further provided with a temperature sensor for sensing the temperature of the cooling water,
The controller closes the first valve, the second valve, and the third valve in a low temperature state of the engine according to the temperature information of the coolant received from the temperature sensor, and opens the fourth valve. Engine cooling system. The method of claim 8,
And the controller determines that the engine is in a low temperature state when the temperature of the cooling water is greater than or equal to the first set temperature and less than the second set temperature. The method of claim 9,
The controller closes the first valve and the second valve when the temperature of the coolant is high in the low temperature condition range of the engine according to the temperature information of the coolant received from the temperature sensor, and closes the third valve and the A cooling device for the engine, characterized in that the fourth valve is opened. The method of claim 10,
The controller is a cooling device of the engine, characterized in that when the temperature of the cooling water is above the second set temperature and below the third set temperature, the engine determines that the temperature of the coolant is high in a low temperature condition category. The method of claim 4,
Each of the cylinder block and the integrated flow control valve is further provided with a temperature sensor for sensing the temperature of the cooling water,
The controller closes the second valve and opens the first valve, the third valve, and the fourth valve in a hot and low temperature state of the engine according to the temperature information of the coolant received from the temperature sensor. Engine cooling system. The method of claim 12,
And the controller determines that the engine is in a hot and low temperature state when the temperature of the cooling water is greater than or equal to the third set temperature and less than the fourth set temperature. The method of claim 4,
Each of the cylinder block and the integrated flow control valve is further provided with a temperature sensor for sensing the temperature of the cooling water,
The controller opens all of the first valve, the second valve, the third valve, and the fourth valve in a hot and high temperature state of the engine according to the temperature information of the cooling water received from the temperature sensor. Engine cooling system. The method of claim 14,
And the controller determines that the engine is in a hot high temperature state when the temperature of the cooling water is equal to or higher than the fourth set temperature. The method of claim 4,
Each of the cylinder block and the integrated flow control valve is provided to detect the temperature of the cooling water, and further includes a temperature sensor for transmitting the detected temperature information of the cooling water to the controller,
The controller,
When the temperature of the received cooling water is less than the first set temperature, the first valve, the second valve, the third valve, and the fourth valve are all closed.
When the temperature of the received cooling water is above the first set temperature and below the second set temperature, the first valve, the second valve, and the third valve are closed, and the fourth valve is opened,
When the temperature of the delivered cooling water is greater than or equal to the second set temperature and less than the third set temperature, the first valve and the second valve are closed, and the third valve and the fourth valve are opened,
When the temperature of the received cooling water is greater than or equal to the third set temperature and less than the fourth set temperature, the second valve is closed, and the first valve, the third valve, and the fourth valve are opened,
When the temperature of the received cooling water is greater than or equal to the fourth set temperature, the first valve, the second valve, the third valve, and the fourth valve, the cooling system of the engine, characterized in that all open. According to claim 1,
The water chamber is an engine cooling device, characterized in that formed of a heat insulating material. According to claim 1,
The water chamber is a cooling device of the engine, characterized in that the volume is larger than the water jacket. According to claim 1,
Cooling system of the engine, characterized in that a heat insulating material is coated on the surface of the water chamber.

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