KR102474359B1 - Engine cooling system having coolant pump unit - Google Patents

Abstract

An engine cooling system having a coolant pump unit according to an embodiment of the present invention includes a cylinder head disposed on a cylinder block, and a coolant pump unit for pumping coolant to coolant inlets of the cylinder block and the cylinder head, respectively, The coolant pump unit includes: an impeller mounted on a rotating shaft to pump coolant; a slider arranged to move in a longitudinal direction of the shaft to block or open a coolant outlet of the impeller; Cooling water pressure control means for opening or closing the discharge port connected to the cylinder block, and cooling water pressure control means such that the slider periodically repeats operations of closing the discharge port for a set time and opening for a set time within a coolant warm-up period. It may include a control unit for controlling.

Description

Engine cooling system having a coolant pump unit {ENGINE COOLING SYSTEM HAVING COOLANT PUMP UNIT}

The present invention relates to an engine cooling system equipped with a coolant pump unit capable of reducing the warm-up time of an engine and improving cooling efficiency by respectively controlling coolant supplied to a cylinder block and a cylinder head according to driving conditions. it's about

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 have different warm-up performance, fuel economy, 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 equipped with a coolant pump unit capable of reducing a coolant warm-up time by optimizing a control strategy of a variable coolant pump or a multi-stage coolant pump in a warm-up section.

An engine cooling system having a coolant pump unit according to an embodiment of the present invention includes a coolant pump unit for pumping coolant to a coolant inlet side of an engine block composed of a cylinder block and a cylinder head, wherein the coolant pump unit includes the coolant An impeller mounted on the shaft to pump, a slider arranged to be able to move forward and backward in the longitudinal direction of the shaft to block or open the cooling water outlet of the impeller, and the slider back and forth using the cooling water pressure discharged from the through hole formed in the impeller. Cooling water pressure control means for supplying and controlling cooling water pressure for driving the engine, and a control unit for controlling the cooling water pressure control means so that the slider repeats an operation of closing and opening the discharge port for a set time during a warm-up period of cooling water. can include

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

A cooling water pressure chamber filled with pressure so that the slider closes the discharge port is formed on a rear surface of the slider, and the cooling water pressure control means is a control valve supplying cooling water pressure to the cooling water pressure chamber or bypassing the discharge port. , and a cooling water pressure transmission unit that transfers the cooling water pressure generated by the impeller 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.

The cooling water pressure transmission unit includes a sliding plate having an edge portion sliding on the other surface of the rotating disk and having a concave groove formed corresponding to the through hole, a support member supporting the opposite surface of the sliding plate to the concave groove, A pressurizing elastic member for elastically supporting the supporting member toward the rotating disk may be included, and a transmission passage through which cooling water pressure is transmitted may be formed between the sliding dish and the center of the supporting member.

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.

The control unit controls the closing time and the opening time of the slider for the discharge port in a repeatedly set pattern during the coolant warm-up period, and a control logic for controlling the opening rate during the opening time in a gradually increasing pattern. can be done

The cooling water pressure control means closes the outlet of the slider for a first closing time T1c and opens it at a first opening rate S1 during a first opening time T1o, The operation of closing during the second closing time T2c and opening at the second opening rate S2 during the second opening time T2o may be sequentially performed.

The first closing time T1c is longer than the second closing time T2c, the first opening time T1o is shorter than the second opening time T2o, and the first opening rate S1 is It may be smaller than the second open rate S2.

The control unit may control the cooling water pressure control means so that the slider completely opens the outlet when the cooling water warm-up period ends.

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

The cooling water control valve unit may further include a cooling water control valve unit receiving cooling water discharged from the cylinder head and the cylinder block and distributing the cooling water to cooling water components.

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 cooling water control valve unit controls the cooling water supplied to the radiator, controls the cooling water supplied to the heater and the low pressure EGR cooler, and controls the cooling water supplied to the EGR valve, and controls the cooling water supplied to the high pressure EGR cooler; Cooling water supplied to the oil cooler and the transmission oil warmer may be controlled.

A cooling water pump unit according to an embodiment of the present invention includes an impeller mounted on a rotating shaft for pumping cooling water, a slider disposed to move in the longitudinal direction of the shaft to block or open one side and the other side of a cooling water outlet of the impeller, the Cooling water pressure control means for moving a slider so that the slider opens or closes the discharge port connected to the cylinder head and the cylinder block, and the slider closes the discharge port for a set time and periodically repeats an operation of opening the discharge port for a set time. A control unit controlling the cooling water pressure control means may be included.

The control unit, through the cooling water pressure control means, closes the outlet of the slider for a first closing time T1c, opens it at a first opening rate S1 for a first opening time T1o, and The operation of closing during the closing time T2c and opening at the second opening rate S2 during the second opening time T2o may be sequentially performed.

The first closing time T1c is longer than the second closing time T2c, the first opening time T1o is shorter than the second opening time T2o, and the first opening rate S1 is It may be smaller than the second open rate S2.

According to an embodiment of the present invention, by implementing a zero flow state of coolant in the cylinder block and cylinder head in the cold condition of the engine, the warm-up time can be shortened, fuel consumption can be reduced, and heating performance can be improved can make it

In particular, within the coolant warm-up period, the control unit controls the coolant pressure control means so that the slider of the coolant pump unit closes the discharge port for a set time and periodically repeats an operation to open the outlet for a set time to shorten the coolant warm-up time. can

In addition, when the cooling water warm-up is completed, the cooling system can be operated more stably by keeping the slider completely open.

1 is a block diagram of an engine cooling system having a coolant 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 cooling water 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 cooling water 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 cooling water pump unit according to an embodiment of the present invention.
5 is a graph showing the opening rate of the slider and the flow rate of coolant over time.
6 is a graph showing the opening rate of the slider and the flow rate of coolant over time in an embodiment of the present invention.
7 is a graph showing cooling water temperature and cooling water flow rate over time in an embodiment of the present invention.
8 is a flowchart showing a method of controlling a cooling water 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 coolant pump unit according to an embodiment of the present invention.

Referring to FIG. 1, the engine cooling system includes a cylinder block 110, a cylinder head 100, a coolant pump unit 105, a coolant control valve unit 140, a low pressure GR 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 cooling water pump unit 105 is disposed at the cooling water inlet side of the engine block 100 or 110, and the cooling water control valve unit 140 is disposed at the cooling water outlet side of the engine block 100 or 110.

The cooling water 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 cooling water 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 coolant control valve unit 140 is disposed.

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

Here, while the cooling water pump unit 105 is pumping the cooling water, the flow of the cooling water 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 cooling water 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 coolant 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 can be controlled.

The structure of the cooling water 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 cooling water pump unit according to an embodiment of the present invention.

Referring to FIG. 2 , the coolant 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 cooling water pressure control means for moving the slider 215 is mounted on one side of the cooling water pump 105 .

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

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 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 operated, 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 The rear surface of the slider 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 cooling water 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 cooling water 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 delivery passage 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 is a graph showing the opening rate of the slider and the flow rate of coolant over time.

Referring to FIG. 5 , the horizontal axis represents time, and the vertical axis represents the flow rate of cooling water pumped by the cooling water pump unit 105 and passing through the discharge port 290 and the opening rate of the discharge port 290 according to the movement of the slider 215. indicate

In the warm-up section where the cooling water is low, the slider 215 advances, closes the outlet 290, and the flow rate of the cooling water is maintained at zero.

When the warm-up is completed, the control unit 280 controls the cooling water pressure control means for moving the slider to linearly retreat the slider 215. Accordingly, the opening rate of the outlet 290 gradually increases, and the flow rate of cooling water also gradually increases.

6 is a graph showing the opening rate of the slider and the flow rate of coolant over time in an embodiment of the present invention.

Referring to FIG. 6 , the horizontal axis represents time, and the vertical axis represents the flow rate of cooling water pumped by the cooling water pump unit 105 and passing through the discharge port 290 and the opening rate of the discharge port according to the movement of the slider 215.

In the warm-up section where the cooling water is low, the slider 215 advances, closes the outlet 290, and the flow rate of the cooling water is maintained at zero.

More specifically, based on time, the slider 215 closes the outlet 290 for a first closing time T1c, opens it for a first opening time T1o, and closes the outlet 290 for a second closing time T2c. closed during the second opening time T2o, and closed during the third closing time T3c.

And, open during the third open time T3c, closed during the fourth close time T4c, open during the fourth open time T4o, closed during the fifth close time T5c, and fifth open time It is open during (T5o), closed during the sixth closing time (T6c), and then the slider 215 continues to open the discharge port.

Here, the first closing time T1c > the second closing time T2c > the third closing time T3c > the fourth closing time T4c > the fifth closing time T5c > the sixth closing time Tc. have a relationship

In addition, the first open time T1o > the second open time T2o > the third open time T3o > the fourth open time T4o > the fifth open time T5o, and the first open time T5o. The first opening rate of the time T1o is S1%, the second opening rate of the second opening time T2o is S2%, the third opening rate of the third opening time T3o is S3%, and the fourth opening rate is S3%. The fourth opening rate of the opening time T4o is S4%, and the fifth opening rate of the fifth opening time T5o is S5%.

Here, the first open rate (S1%) < the second open rate (S2%) < the third open rate (S3%) < the fourth open rate (S4%) < the fifth open rate (S5%) .

In the embodiment of the present invention, within the coolant warm-up period, the control unit 280 controls the coolant pressure control means so that the slider 215 closes the outlet 290 for a set time and opens it for a set time. repeat periodically.

Accordingly, the warming-up time of the cooling water can be shortened, and after the cooling water warming-up is completed, the slider 215 completely opens the outlet 290 so that the cooling system can be operated more stably.

7 is a graph showing cooling water temperature and cooling water flow rate over time in an embodiment of the present invention.

Referring to FIG. 7 , the horizontal axis represents time and the vertical axis represents the coolant temperature detected by the sensor and the flow rate pumped by the coolant pump unit 105 .

The control unit 280 advances the slider 215 for about 200 seconds to close the discharge port 290, and then opens the slider 215 at a set period, a set time, and a set opening rate to supply cooling water. By intermittently circulating, the temperature of the cooling water converges to a constant warm-up temperature.

In the process of opening and closing the slider 215, the temperature of the cooling water repeatedly rises and falls, but the fluctuation range decreases and reaches a constant warm-up temperature, so that the temperature of the coolant quickly reaches the preset warm-up temperature.

In addition, after the cooling water temperature reaches the warm-up temperature, the control unit 280 may completely open the slider 215 to improve the overall stability of the cooling system.

8 is a flowchart showing a method of controlling a cooling water pump unit according to an embodiment of the present invention.

Referring to FIG. 8 , when the engine is started, control starts in S800 and the control unit 280 receives driving information in S810. Here, the operation information may include coolant temperature, engine RPM, outside air temperature, fuel injection amount, torque, and the like.

In S820, the control unit 280 determines whether the coolant temperature is less than a set value. If this condition is satisfied, the control unit 280 advances or retreats the slider 215 in S830 to repeat the operation of closing and opening the outlet 290 based on the contents described in FIG. 6 . If the condition of S820 is not satisfied, S850 is performed.

While performing S830, in S840, the control unit 280 determines whether the coolant temperature is equal to or greater than a set value. If this condition is not satisfied, S830 is performed again, and if this condition is satisfied, S850 is performed.

In S850, the control unit 280 completely retracts the slider 215 to keep the discharge port 290 of the cooling water pump unit 105 completely open.

Then, if the engine is stopped, the control unit 280 performs S860, and if the engine continues to operate, it performs S810 again.

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

105: cooling water pump unit 200: shaft
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 (17)

a coolant pump unit pumping coolant to the coolant inlet side of the engine block composed of the cylinder block and the cylinder head, respectively; including,
The cooling water pump unit,
an impeller mounted on the shaft to pump coolant;
a slider arranged to move forward and backward in the longitudinal direction of the shaft to block or open the cooling water outlet of the impeller;
Cooling water pressure control means for supplying and controlling cooling water pressure for driving the slider forward and backward using the cooling water pressure discharged from the through hole formed in the impeller; and
a control unit controlling the cooling water pressure control means so that the slider repeats an operation of closing and opening the discharge port for a set time during a coolant warm-up period; Engine cooling system having a coolant pump unit comprising a. According to claim 1,
a return elastic member that elastically supports the slider so that the slider opens the discharge port; An engine cooling system having a coolant pump unit comprising a. According to claim 2,
A cooling water pressure chamber filled with pressure so that the slider closes the discharge port is formed on the rear surface of the slider,
The cooling water pressure control means,
a control valve supplying cooling water pressure to the cooling water pressure chamber or bypassing the cooling water pressure to the outlet; and
a cooling water pressure transmission unit for transferring the cooling water pressure generated by the impeller to the control valve; Engine cooling system having a coolant pump unit comprising a. According to claim 3,
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 having a coolant pump unit in which a through hole is formed from one surface to the other surface of the rotating disk. According to claim 4,
The cooling water pressure transmission unit,
a sliding dish having an edge portion sliding on the other surface of the rotating disk and having a concave groove corresponding to the through hole;
a support member supporting a surface opposite to the concave groove of the sliding dish;
a pressing elastic member for elastically supporting the support member toward the rotating disk; including,
An engine cooling system having a cooling water pump unit in which a transmission passage through which cooling water pressure is transmitted is formed in the center of the sliding plate and the support member. According to claim 5,
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 having a coolant pump unit further comprising a. According to claim 1,
The control unit
During the warm-up period of the cooling water,
An engine cooling system having a coolant pump unit that performs control logic to control the closing time and opening time of the slider with respect to the discharge port in a repeatedly set pattern, and also controls the opening rate in a gradually increasing pattern during the opening time. . According to claim 7,
The cooling water pressure control means closes the outlet of the slider for a first closing time T1c through the cooling water pressure control means;
It is opened at a first opening rate (S1) during a first opening time (T1o),
Closed during the second closing time (T2c),
An engine cooling system having a coolant pump unit that sequentially performs an opening operation at a second opening rate (S2) during a second opening time (T2o). According to claim 8,
The first closing time T1c is longer than the second closing time T2c,
The first opening time T1o is shorter than the second opening time T2o,
The engine cooling system having a coolant pump unit in which the first opening rate (S1) is smaller than the second opening rate (S2). According to claim 8,
The control unit,
When the coolant warm-up period ends, the cooling water pump unit controls the cooling water pressure control means so that the slider completely opens the discharge port. According to claim 1,
An engine cooling system having a coolant pump unit, wherein the coolant passing through the coolant outlet of the impeller is distributed to the cylinder head and the cylinder block. According to claim 1,
a coolant control valve unit receiving the coolant discharged from the cylinder head and the cylinder block and distributing the coolant to coolant parts; An engine cooling system having a coolant pump unit further comprising a. According to claim 12,
The cooling water parts 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. According to claim 13,
The cooling water control valve unit,
controlling the flow rate of the coolant supplied to the radiator;
Controls the flow rate of cooling water supplied to the heater and the low pressure EGR cooler;
Controls the flow rate of cooling water supplied to the EGR valve,
An engine cooling system having a coolant pump unit controlling a flow rate of coolant supplied to the high-pressure EGR cooler, the oil cooler, and the transmission oil warmer. An impeller mounted on a rotating shaft to pump coolant;
a slider disposed to move in the longitudinal direction of the shaft to block or open one side and the other side of the cooling water outlet of the impeller;
cooling water pressure control means for moving the slider to open or close a discharge port connected to the cylinder head and the cylinder block by the slider; and
a control unit controlling the cooling water pressure control means so that the slider periodically closes and opens the discharge port for a set time; Including,
The control unit, through the cooling water pressure control means, closes the outlet of the slider for a first closing time T1c, opens it at a first opening rate S1 for a first opening time T1o, and The coolant pump unit sequentially performs operations of closing during the closing time T2c and opening at the second opening rate S2 during the second opening time T2o. delete According to claim 15,
The first closing time T1c is longer than the second closing time T2c, the first opening time T1o is shorter than the second opening time T2o, and the first opening rate S1 is The cooling water pump unit smaller than the second opening rate (S2).

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