KR102474361B1 - Engine cooling system - Google Patents

Abstract

An engine cooling system according to an embodiment of the present invention includes a variable pump unit that controls the flow rate of coolant supplied to each coolant inlet side of a cylinder block and cylinder head, and coolant supplied by being connected to the coolant outlet side of the cylinder block and cylinder head. A flow control valve unit for controlling the flow rate of coolant distributed to each part in the cooling cycle, disposed on a flow path between the coolant outlet side of the cylinder block and the flow control valve unit to control the flow rate of coolant discharged from the cylinder block and a control unit that controls the flow rate of coolant supplied to the cylinder block and the cylinder head by controlling the variable pump unit and the electronic thermostat according to the temperature of the coolant.

Description

Engine cooling system {ENGINE COOLING SYSTEM}

The present invention relates to an engine cooling system capable of reducing an engine warm-up time and improving cooling efficiency by controlling coolant supplied to a cylinder block and a cylinder head according to driving conditions.

The engine emits heat energy to the outside while generating rotational force by burning fuel. In particular, the cooling water absorbs thermal energy while circulating through the engine and the like, and releases it to the outside through the radiator and the like.

When the temperature of the engine coolant is low, the viscosity of the oil increases, which increases frictional force, increases fuel consumption, and increases the temperature of the exhaust gas slowly, increasing the catalyst activation time. In addition, the quality of the exhaust gas may deteriorate, and the time required for the function of the heater to be normalized may increase, which may cause inconvenience to passengers and drivers.

When the temperature of the cooling water of the engine is overheated, knocking occurs, and since the ignition timing must be adjusted to suppress knocking, the performance of the engine may be deteriorated. In addition, if the temperature of the lubricating oil is excessive, the lubricating action may be deteriorated.

Accordingly, a single coolant control valve is used to control several cooling elements through a single valve, such as maintaining a high coolant temperature in a specific part of the engine and a low temperature in other parts.

Meanwhile, a technology in which one cooling water control valve unit controls cooling water passing through a radiator, a heater, an EGR cooler, an oil cooler, or a cylinder block has already been implemented.

In this way, by using one cooling water control valve unit, cooling water distributed to more cooling elements (radiators, heaters, EGR coolers, oil coolers, etc.) can be controlled and cooling performance can be improved.

As prior literature, there is Japanese Patent Application Publication No. 2015-59615.

The water pump of the engine is divided into a mechanical water pump that drives in proportion to the number of engine revolutions and a variable water pump that can be controlled according to engine and environmental factors regardless of the number of revolutions of the engine.

Variable water pumps show different warm-up performance, fuel efficiency, heating performance, and cooling performance depending on the structure and control method. In order to improve its performance, it is necessary to optimize the control method considering the engine and environmental factors as well as the optimization of the structure.

Matters described in this background art section are prepared to enhance understanding of the background of the invention, and may include matters that are not prior art already known to those skilled in the art to which this technique belongs.

An object of the present invention is to provide an engine cooling system capable of optimizing the control logic by reducing the warm-up time by stopping the flow of coolant between the cylinder block and the cylinder head and controlling the coolant passing through the cylinder head and the cylinder block in multiple stages, respectively. will be.

An engine cooling system according to an embodiment of the present invention includes a variable pump unit that controls the flow rate of coolant supplied to each coolant inlet side of a cylinder block and cylinder head, and coolant supplied by being connected to the coolant outlet side of the cylinder block and cylinder head. A flow control valve unit for controlling the flow rate of coolant distributed to each part in the cooling cycle, disposed on a flow path between the coolant outlet side of the cylinder block and the flow control valve unit to control the flow rate of coolant discharged from the cylinder block and a control unit that controls the flow rate of coolant supplied to the cylinder block and the cylinder head by controlling the variable pump unit and the electronic thermostat according to the temperature of the coolant.

The variable pump unit includes an impeller mounted on a shaft to pump coolant, a slider disposed to move in the longitudinal direction of the shaft to block or open a coolant discharge port of the impeller, and moving the slider so that the slider is connected to the cylinder head. A driving means for opening or closing the discharge port connected to the cylinder block may be included.

The control unit may have a control logic for controlling the slider to close the outlet so that the coolant is not supplied to the cylinder head and the cylinder block when the coolant temperature is lower than the first temperature T1 .

The control unit controls the opening rate of the outlet so that the slider supplies coolant to the cylinder head and the cylinder block when the coolant temperature is equal to or higher than a first temperature (T1) and lower than a second temperature (T2); A control logic blocking the electronic thermostat to prevent coolant from flowing into the cylinder block may be provided.

The control unit controls the opening rate of the electronic thermostat so that the slider fully opens the outlet to supply the coolant to the cylinder head and the cylinder block when the coolant temperature is equal to or higher than the second temperature and lower than the third temperature. It may have a control logic for controlling coolant flowing through the cylinder block.

The control unit controls that, when the coolant temperature is equal to or higher than the third temperature, the slider fully opens the discharge port to supply the coolant to the cylinder head and the cylinder block, and fully opens the electronic thermostat so that the coolant flows through the cylinder block. It may have a control logic that controls the cooling water.

The slider may include a return elastic member that elastically supports the slider to open the discharge port.

The driving unit may include a control valve for supplying cooling water pressure to a cooling water pressure chamber where the slider closes the discharge port or discharging the cooling water pressure filled in the cooling water pressure chamber through the discharge port, and the cooling water pressure generated by the impeller. It may include a cooling water pressure transmission unit for transmitting to the control valve side.

The impeller may include a rotating disk extending in a radial direction from a rotation center, and wings for pumping cooling water in a radial direction on one surface of the rotating disk, and a through hole may be formed from one surface of the rotating disk to the other surface.

In the cooling water pressure transmission unit, a sliding plate having a concave groove corresponding to the through hole and having an edge portion sliding on the other surface of the rotating disk, a support member supporting the opposite surface of the sliding plate to the concave groove, and a pressurizing elastic member for bringing the support member into close contact with the sliding plate and bringing the sliding plate into close contact with the other surface of the rotating disk, wherein a cooling water pressure transmission passage may be formed between the sliding plate and the center of the support member. have.

The cooling water pressure passing through the delivery passage is transmitted to the control valve, and a second check valve may be further included to prevent the cooling water pressure transmitted to the control valve from flowing back toward the delivery passage.

Coolant passing through the coolant outlet of the impeller may be distributed to the cylinder head and the cylinder block.

The coolant parts may include a radiator, a heater, a low pressure EGR cooler, an EGR valve, a high pressure EGR cooler, an oil cooler, and a transmission oil warmer.

The control unit controls the operation of the flow control valve unit to control the cooling water supplied to the radiator, the cooling water supplied to the heater and the low pressure EGR cooler, and the cooling water supplied to the EGR valve. and control cooling water supplied to the high-pressure EGR cooler, the oil cooler, and the transmission oil warmer.

According to an embodiment of the present invention, when the coolant temperature is low, the warm-up time can be shortened by not pumping the coolant to the cylinder head and the cylinder block, and when the coolant temperature reaches a set value, the coolant is pumped to the cylinder head. However, the cylinder block blocks the flow of coolant so that the control logic can be further optimized.

In particular, the coolant pumped to the cylinder head and cylinder block is controlled as a whole by controlling the slider of the variable pump unit, and the coolant flowing through the cylinder block can be effectively controlled by the operation of the electronic thermostat.

As a result, it is possible to shorten the warm-up time and optimize the control logic by controlling the coolant passing through the cylinder block and the cylinder head in various ways according to the temperature of the coolant.

1 is a block diagram of an engine cooling system having a variable pump unit according to an embodiment of the present invention.
2 is a cross-sectional view showing a state in which a discharge port is opened by a slider in a variable pump unit according to an embodiment of the present invention.
3 is a cross-sectional view showing a state in which a slider closes a discharge port in a variable pump unit according to an embodiment of the present invention.
4 is a cross-sectional view of a cooling water pressure transmission unit in a variable pump unit according to an embodiment of the present invention.
5 and 6 are graphs showing pumping characteristics of a variable pump unit according to an embodiment of the present invention.
7 is a graph showing flow characteristics of coolant in an engine cooling system having a variable pump unit according to an embodiment of the present invention.
8 is a flowchart showing a control method of an engine cooling system having a variable pump unit according to an embodiment of the present invention.

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

However, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown in the drawings, and the thickness is enlarged to clearly express various parts and regions. was

However, in order to clearly describe the embodiments of the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification for description.

In the following description, the names of the components are divided into first, second, etc. to distinguish them because the names of the components are the same, and are not necessarily limited to the order.

1 is a block diagram of an engine cooling system having a variable pump unit according to an embodiment of the present invention.

1, the engine cooling system includes a cylinder block 110, a cylinder head 100, a variable pump unit 105, a flow control valve unit 140, a low pressure EGR cooler 155, a heater 165, EGR valve 160, reservoir 150, radiator 135, transmission oil warmer 130, oil cooler 125, high pressure EGR cooler 120, electronic thermostat 147, and thermostat 115 ).

The cylinder head 100 is disposed on the cylinder block 110 . Here, the cylinder block 110 and the cylinder head 100 may be referred to as engine blocks (reference numerals not shown).

The variable pump unit 105 is disposed at the cooling water inlet side of the engine block 100 or 110, and the flow control valve unit 140 is disposed at the cooling water outlet side of the engine block 100 or 110.

The flow control valve unit 140 controls the cooling water passing through the low pressure EGR cooler 155 and the heater 165, controls the cooling water passing through the EGR valve 160, and controls the radiator 135. It is possible to control cooling water passing through, and controlling cooling water passing through the transmission oil warmer 130 and the oil cooler 125 .

The reservoir 150 is connected to the cooling water line connected to the radiator 135, and the cooling water in the reservoir 150 is connected to the suction side of the variable pump unit 105. Also, the thermostat 115 is opened and closed according to the coolant temperature, and its installation position may be changed or may not be installed according to design specifications.

A block coolant temperature sensor 145 for detecting the temperature of the coolant flowing through the cylinder block 110 is disposed, and a valve coolant temperature sensor 147 for detecting the temperature of the coolant flowing through the flow control valve unit 140 is disposed.

In addition, an electronic thermostat 147 is disposed between the coolant outlet of the cylinder block 110 and the coolant inlet of the flow control valve unit 140, and the electronic thermostat 147 controls the control unit 280, Figure 2) is operated by.

Here, while the variable pump unit 105 is pumping the coolant, the flow of the coolant of the cylinder block 110 may be controlled by the operation of the electronic thermostat 147 .

In an embodiment of the present invention, reference is made to known technologies for a structure in which the flow control valve unit 140 distributes cooling water to cooling water components. In addition, reference is made to known technologies for the structure and function of the cooling water components (heater, radiator, etc.).

The variable pump unit 105 sucks coolant discharged from coolant parts and pumps it to the cylinder head and cylinder block. etc.), the coolant temperature, etc., the flow rate of the coolant pumped to the cylinder head 100 and the cylinder block 110 may be controlled.

The structure of the variable pump unit 105 will be described with reference to FIG. 2 .

2 is a cross-sectional view showing a state in which a discharge port is opened by a slider in a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 2 , the variable pump unit 105 includes an impeller housing 220, a slider 215, a pump housing 210, a pulley 205, a shaft 200, a support member 240, and a through hole 235. ), an impeller 230 including a wing 234 and a rotating disk 232, a position sensor 295, and a return elastic member 245.

A driving means for moving the slider 215 is mounted on one side of the cooling water pump 105 .

The driving means may include a cooling water pressure transmission unit 250, a first check valve 275, and a solenoid 270, and the driving means may selectively include all structures for moving the slider 215. .

The control unit 280 may control the position of the slider 215 by controlling the solenoid 270 according to the position of the slider 215 detected by the position sensor 295 according to driving information. Accordingly, the opening rate of the cooling water outlet 290 can be controlled according to the position of the slider 215 .

In more detail, the impeller 230 is mounted on one end of the shaft 200, and the impeller 230 is mounted on the outer circumferential surface of the shaft 200, and the disk-shaped rotating disk 232 and A wing 234 formed on one surface of the rotating disk 232 is included.

The pulley 205 is mounted on the other end of the shaft 200, and the pulley 205 receives rotational force from an output shaft of the engine and rotates the shaft 200.

As the rotating disk 232 and the blades 234 of the impeller 230 rotate, the cooling water is sucked into the rotational center of the shaft 200 and the cooling water is discharged in a radial direction, substantially pumping the cooling water. Part is the wing 234.

The slider 215 is disposed on the other side of the impeller 230 and has an outer edge end extending to close the discharge port 290 of the impeller 230 . Here, the slider 215 has a cup shape in which the impeller 230 can be disposed, and the shaft 200 passes through the center.

The return elastic member 245 elastically supports one surface of the slider 215 so that the slider 215 retreats from the impeller 230 . Here, the slider 215 is disposed to move reciprocally in the longitudinal direction of the shaft 200, and the support member 240 supports the return elastic member 245.

A through hole 235 is formed from one surface to the other surface of the rotating disk 232 of the impeller 230, and the cooling water pressure transmission unit 250 is disposed on the other side of the through hole 235.

The cooling water pressure transmitting unit 250 supplies the cooling water pressure transmitted through the through hole 235 to the first check valve 275 and, when the solenoid 270 is not operated, the first check valve 275 is not operated. The cooling water pressure transmitted to the valve 275 is bypassed to the outlet of the cooling water pump 105 .

When the solenoid 270 is in operation, the cooling water pressure transmitted to the first check valve 275 is filled into the cooling water pressure chamber 260, and the cooling water pressure filled into the cooling water pressure chamber 260 is applied to the slider. The rear surface of 215 is pushed forward to the impeller 230 side.

Further, the advanced slider 215 compresses the return elastic member 245 and blocks the outlet formed in the radial direction of the impeller 230 .

Conversely, when the solenoid 270 is turned off, the pressure in the cooling water pressure chamber 260 is bypassed to the discharge port to be relieved, and the slider 215 retreats by the elastic force of the return elastic member 245.

In the embodiment of the present invention, the coolant discharged to one side of the radial direction of the impeller 230 may be pumped to the cylinder head 100, and the coolant discharged to the other radial side of the impeller 230 may be pumped to the cylinder block. (110).

In addition, the first check valve 275 and the solenoid 270 may be referred to as control valves 270 and 275 .

3 is a cross-sectional view showing a state in which a slider closes a discharge port in a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 3 , when the slider 215 moves forward, the discharge port is blocked so that coolant is not pumped to the cylinder block 110 and the cylinder head 100 . Conversely, as shown in FIG. 2 , when the slider 215 moves backward, the outlet is opened and coolant is pumped to the cylinder block 110 and the cylinder head 100 .

4 is a cross-sectional view of a cooling water pressure transmission unit in a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 4, the cooling water pressure transmission unit 250 includes a sliding plate 700, a pressure member 705, a pressure elastic member 710, a second check valve 720, a concave groove 702, a transmission passage ( 715), and a housing 252.

The sliding dish 700 has a concave groove 702 concave with respect to the outer surface of the rotating disk 232 of the impeller 230, and the edge of the sliding dish 700 is in contact with the rotating disk 232 have a structure

The pressing elastic member 710 elastically supports the pressing member 705 so that the sliding plate 700 adheres to the outer surface of the rotating disk 232 .

In addition, a transmission passage 715 for transmitting cooling water pressure is formed at the center of the sliding plate 700 and the pressing member 705 . In addition, the second check valve 720 prevents the cooling water pressure from flowing backward toward the sliding dish 700 through the delivery passage 715 .

The pressing member 705, the pressing elastic member 710, and the second check valve 720 are mounted inside the transmission passage 252, and the cooling water pressure is increased by the rotation of the impeller 230. It is formed on one side of the rotating disk 232 by the wing 234.

The formed cooling water pressure passes through the through hole 235 of the rotating disk 232, the concave groove 702 of the sliding dish 700, the transmission passage 715, and the second check valve 720. It is transmitted to the first check valve 275.

As described above, the solenoid 270 is turned on, the first check valve 275 is closed, the cooling water pressure is formed in the cooling water pressure chamber 260, and the slider 215 moves forward to close the outlet. do. Thus, the flow of coolant between the cylinder head 100 and the cylinder block 110 is stopped.

When the solenoid 270 is turned off, the first check valve 275 is opened, the cooling water pressure in the cooling water pressure chamber 260 is released to the outside, and the return elastic member 245 moves the slider 215. Retract to open the discharge port. Therefore, the flow of coolant in the cylinder head 100 can be implemented, and the flow of coolant in the cylinder block 110 can be implemented when the electronic thermostat 147 is opened.

In an embodiment of the present invention, the control unit 280 calculates the position of the slider 215 using the position signal transmitted from the position sensor 295, and uses the calculated position to determine the position of the slider 215. The position of can be changed according to driving information.

5 and 6 are graphs showing pumping characteristics of a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 5, the horizontal axis represents the rotation speed of the impeller 230, and the vertical axis represents the flow rate. At the point where the rotation speed of the impeller 230 is the same, the discharge flow rate of the cooling water according to the position of the slider 215 can be controlled in multiple stages.

Referring to FIG. 6, the horizontal axis represents the position of the slider 215, the vertical axis represents the discharge flow rate of coolant, and the position of the slider 215 is variable at a point where the rotational speed of the impeller 230 is constant. Accordingly, the discharge flow rate of cooling water can be variably controlled.

7 is a graph showing flow characteristics of coolant in an engine cooling system having a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 7, the horizontal axis represents the cooling water temperature, and the vertical axis represents the discharge flow rate of the cooling water. In Zone 1 and Zone 3-1, the control unit 280 advances the slider 215 to completely open the outlet 290. and the coolant is not pumped to the cylinder head 100 and the cylinder block 110.

In Zone 2 and Zone 3-2, the control unit 280 controls the opening rate of the outlet 290 through the slider 215 to control the coolant pumped to the cylinder head 100, and the electronic thermostat ( 147) is blocked and coolant is not pumped to the cylinder block 110.

In zone 3, the control unit 280 completely opens the discharge port 290 through the slider 215, so that the coolant having the maximum flow rate is circulated through the cylinder head 100, and the electronic thermostat 147 The cooling water pumped to the cylinder block 110 is controlled by being opened and closed according to the cooling water temperature.

In Zone 4, the control unit 280 completely opens the discharge port 290 through the slider 215 so that the coolant is circulated to the cylinder head 100 at the maximum flow rate and the electronic thermostat 147 is also set to the maximum. When opened, coolant is pumped to the cylinder block 110 at maximum flow rate.

8 is a flowchart showing a control method of an engine cooling system having a variable pump unit according to an embodiment of the present invention.

Referring to FIG. 8 , when the engine is started, the control unit 280 performs control at S100.

In step S105, the control unit 280 completely reverses the slider 215 of the variable pump unit 105 to open the outlet 290 100%.

In S110, the control unit 280 detects the coolant temperature through the coolant temperature sensor 146, and the control unit 280 determines whether the coolant temperature is higher than the first temperature (50 degrees Celsius).

If the condition S110 is not satisfied, the control unit 280 performs S145. In S145, the control unit 280 determines whether the heater 165 is in an ON state. If the condition S145 is satisfied, the control unit 280 can control the position of the slider 215 of the variable pump unit 105 based on Zone3-1 at S150.

If the condition S145 is not satisfied, the control unit 280 can control the position of the slider of the variable pump unit 105 based on Zone-1 in S155.

When the condition S110 is satisfied, the control unit 280 can control the position of the slider of the variable pump unit 105 based on Zone2 in S115.

Then, in S120, the control unit 280 detects the coolant temperature through the coolant temperature sensor 146, and the control unit 280 determines whether the coolant temperature is greater than the second temperature (90 degrees Celsius).

If the condition of S120 is not satisfied, the control unit 280 determines whether the heater 165 is in an ON state in S160. Here, the on state of the heater 165 can be determined from a heater operation signal.

If S160 is satisfied, the control unit 280 can control the position of the slider 215 of the variable pump unit 105 based on Zone3-2 in S165.

In the course of performing S165 and S155, S110 may be performed, and when the engine is turned off, the control logic may move to S140 and control may be terminated.

When the condition S120 is satisfied, the control unit 280 can control the position of the variable pump unit 105 based on Zone3 in S125.

Then, in S130, the control unit 280 detects the coolant temperature through the coolant temperature sensor 146, and the control unit 280 determines whether the coolant temperature is greater than the third temperature (105 degrees Celsius).

If the condition S130 is not satisfied, control is terminated by performing S110 or, if the engine is stopped, performing S140.

When the condition S130 is satisfied, the control unit 280 can control the position of the slider 215 of the variable pump unit 105 based on Zone4 in S135. Thereafter, when S110 is performed or the engine is stopped, control is terminated through S140.

In an embodiment of the present invention, the first temperature may be set to 50 degrees Celsius, which may vary depending on engine design specifications. In addition, the second temperature may be set to 90 degrees Celsius, which may vary according to engine design specifications. Also, the third temperature may be set to 105 degrees Celsius, which may vary depending on engine design specifications.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be easily changed from the embodiments of the present invention by those skilled in the art to which the present invention belongs, so that the same It includes all changes within the scope recognized as appropriate.

100: cylinder head 110: cylinder block
105: variable pump unit 147: electronic thermostat
200: shaft 145: block coolant temperature sensor
146: valve coolant temperature sensor 115: thermostat
205: pulley 210: pump housing
215: slider 220: impeller housing
230: impeller 232: rotating disk
234: wing 235: through hole
240: support member 245: return elastic member
250: cooling water pressure transmission unit 252: housing
260: cooling water pressure chamber 270: solenoid
275: first check valve 280: control unit
290: discharge port 700: sliding plate
702: concave groove 715: transmission passage
705: pressing member 710: pressing elastic member
720: second check valve

Claims (14)

a variable pump unit controlling a flow rate of coolant supplied to each coolant inlet side of the cylinder block and cylinder head;
a flow control valve unit connected to the coolant outlets of the cylinder block and cylinder head and controlling the flow rate of the coolant supplied to each part of the cooling cycle;
an electronic thermostat disposed on a flow path between the cooling water outlet side of the cylinder block and the flow control valve unit to control the flow rate of the cooling water discharged from the cylinder block; and
A control unit configured to control the flow rate of the coolant supplied to the cylinder block and the cylinder head by controlling the variable pump unit and the electronic thermostat according to the coolant temperature;
The variable pump unit includes: an impeller mounted on a shaft to pump coolant; a slider arranged to move in the longitudinal direction of the shaft to block or open a coolant outlet of the impeller; And a drive means for opening or closing the discharge port connected to the cylinder block,
The driving unit may include a control valve for supplying cooling water pressure to a cooling water pressure chamber where the slider closes the discharge port or discharging the cooling water pressure filled in the cooling water pressure chamber through the discharge port, and a cooling water pressure generated by the impeller. An engine cooling system comprising a cooling water pressure transmission unit for transmitting the to the control valve side. delete According to claim 1,
The control unit,
and a control logic for controlling the slider to close the outlet so that the coolant is not supplied to the cylinder head and the cylinder block when the coolant temperature is lower than the first temperature (T1). According to claim 3,
The control unit,
When the coolant temperature is equal to or higher than a first temperature (T1) and lower than a second temperature (T2), the slider controls an opening rate of the outlet to supply coolant to the cylinder head and the cylinder block;
An engine cooling system having a control logic that blocks the electronic thermostat so that coolant does not flow to the cylinder block. According to claim 4,
The control unit,
When the coolant temperature is equal to or higher than a second temperature and lower than a third temperature, the slider fully opens the outlet to supply coolant to the cylinder head and the cylinder block;
An engine cooling system having a control logic for controlling the cooling water flowing through the cylinder block by controlling the opening rate of the electronic thermostat. According to claim 4,
The control unit is
When the coolant temperature is equal to or higher than a third temperature, the slider completely opens the outlet to supply the coolant to the cylinder head and the cylinder block;
An engine cooling system having a control logic that completely opens the electronic thermostat to control coolant flowing through the cylinder block. According to claim 1,
a return elastic member that elastically supports the slider so that the slider opens the discharge port; Engine cooling system comprising a. delete According to claim 1,
The impeller includes a rotating disk extending radially from a rotation center, and wings for pumping cooling water in a radial direction on one surface of the rotating disk,
An engine cooling system in which a through hole is formed from one surface to the other surface of the rotating disk. According to claim 9,
The cooling water pressure transmission unit,
a sliding plate having a concave groove corresponding to the through hole and having an edge portion sliding on the other surface of the rotating disk;
a support member supporting a surface opposite to the concave groove of the sliding dish; and
a pressing elastic member for bringing the support member into close contact with the sliding plate and for bringing the sliding plate into close contact with the other surface of the rotating disk; including,
An engine cooling system in which a transmission passage for cooling water pressure is formed in the center of the sliding plate and the support member. According to claim 10,
a second check valve configured to transmit the cooling water pressure passing through the transmission passage to the control valve and prevent the cooling water pressure transmitted to the control valve from flowing back toward the transmission passage; An engine cooling system further comprising a. According to claim 1,
The cooling water passing through the cooling water outlet of the impeller is distributed to the cylinder head and the cylinder block. According to claim 1,
The engine cooling system includes a radiator, a heater, a low pressure EGR cooler, an EGR valve, a high pressure EGR cooler, an oil cooler, and a transmission oil warmer. According to claim 13,
The control unit,
By controlling the operation of the flow control valve unit,
The flow rate of the cooling water supplied to the radiator is controlled, the flow rate of the cooling water supplied to the heater and the low pressure EGR cooler is controlled, and the flow rate of the cooling water supplied to the EGR valve is controlled. An engine cooling system controlling an oil cooler and a flow rate of coolant supplied to the transmission oil warmer.

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