US20140165932A1

US20140165932A1 - Engine cooling system for vehicle and control method of the same

Info

Publication number: US20140165932A1
Application number: US13/847,682
Authority: US
Inventors: Chang-Seok Oh
Original assignee: Hyundai Motor Co
Current assignee: Hyundai Motor Co
Priority date: 2012-12-17
Filing date: 2013-03-20
Publication date: 2014-06-19
Also published as: CN103867281A; KR101394051B1; DE102013103423A1

Abstract

An engine cooling system for a vehicle includes a water pump disposed to supply an engine with a coolant and a radiator disposed to cool heated coolant of the engine by exchanging heat with outside air. The system may include: a control valve that is disposed at one side of the engine to control flow rate and flow passage of coolant; a first passage that connects the control valve with the radiator and connects the radiator with the water pump; a TOC that is disposed between an outlet of the radiator and the water pump to be connected through the first passage; a second passage that connects the TOC with the control valve and directly supplies the TOC with the coolant exhausted from the engine; and a heater that is disposed in a third passage that bypasses the engine to connect the control valve with the water pump.

Description

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority of Korean Patent Application Number 10-2012-0147801 filed Dec. 17, 2012, the entire contents of which application is incorporated herein for all purposes by this reference.

BACKGROUND OF INVENTION

1. Field of Invention
The present invention relates an engine cooling system and the control method for a vehicle that controls the flow direction and flow amount of coolant to offer optimized cooling conditions.
2. Description of Related Art
A motorized water pump is used or an electric thermostat using electric heating is applied to control coolant temperature.
Further, there is a method for mounting an ATF warmer on a warm-up circuit of an engine cooling system, but it increases cost and the effectiveness is not high.
Also, when an ATF warmer is applied to reduce friction of an automatic transmission through quick warm-up thereof, a coolant flow rate of a heater line is decreased, fuel consumption is increased by reduction of heat that is supplied from an engine to a heater, and a separate bypass valve has to be mounted.
The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

BRIEF SUMMARY

Various aspects of the present invention provide for an engine cooling system for a vehicle and a control method thereof having advantages of controlling a coolant flow direction and rate in accordance with an engine warm-up condition and an overall engine operating condition to offer an optimized cooling condition by efficiently using waste heat of an engine such that the cooling performance and air-conditioning performance are improved.
An engine cooling system for a vehicle in which a water pump is disposed to supply an engine with a coolant and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air may include: a control valve that is disposed at one side of the engine to control flow rate and flow passage of coolant; a first passage that connects the control valve with the radiator and connects the radiator with the water pump; a transmission oil cooler (TOC) that is disposed between an outlet of the radiator and the water pump to be connected through the first passage; a second passage that connects the TOC with the control valve and directly supplies the TOC with the coolant exhausted from the engine; and a heater that is disposed in a third passage that bypasses the engine to connect the control valve with the water pump.
The control valve may be a 3-way valve that is electrically controlled.
An engine oil cooler (EOC) may be disposed between the TOC and the water pump by connecting the first passage and the second passage.
The EOC may be disposed in parallel with the TOC.
A bypass passage may be formed between the radiator and the water pump, through which a part of the coolant that is exhausted from the radiator is bypassed and the bypassed coolant is supplied to the water pump.
An opening/closing valve may be disposed on the bypass passage
An engine cooling system for a vehicle in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of an engine and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air may include: a control valve that is disposed at a coolant outlet side of the engine; a first passage that connects the control valve and the radiator and connects the radiator and the water pump; a TOC that is disposed in a second passage that is connected to the control valve between the radiator and the water pump and is connected to the first passage; an EOC that is serially disposed with the TOC in the second passage; and a heater that is disposed in a third passage that connects the control valve with the water pump.
An opening/closing valve may be disposed in the first passage between the radiator and the water pump.
A control method of an engine cooling system for a vehicle according to a season mode in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of the engine, a radiator is disposed to cool the heated coolant of the engine through exchanging heat with outside air, a control valve is disposed at a coolant outlet side of the engine, wherein the control valve is connected with the radiator through a first passage, is connected to a TOC that is disposed in the first passage through a second passage, and is connected to a heater through a third passage, and an EOC is disposed in parallel with the TOC between the first passage and the second passage, wherein the season mode is divided into a summer engine warm-up mode, a summer oil warm-up mode, a summer coolant temperature control mode, and a summer maximum cooling performance demand mode, and a winter engine warm-up mode, a winter engine warm-up and heating mode, a heating and oil heating mode, and a heating and coolant temperature control mode, and in the summer engine warm-up mode and the winter engine warm-up mode, the coolant is prevented from being exhausted from the engine and the control valve closes the first, second, and third passages so as to raise the engine temperature.
In the summer oil warm-up mode, the control valve may close the first and third passages and open the second passage such that the heated coolant of the engine is supplied to the TOC and the EOC to raise the temperature of the transmission oil and engine oil.
In the summer coolant temperature control mode, the control valve may open the first passage that is connected to the radiator and the second passage such that the cooled coolant of the radiator is mixed with the heated coolant of the engine and the mixed coolant having an appropriate temperature passes the TOC and the EOC to be supplied to the engine.
A predetermined flow rate of the coolant flowing in the first passage and the second passage may pass the EOC.
In the summer maximum cooling performance mode, the control valve may open the first passage such that the coolant that is exhausted from the engine is supplied to the radiator at a maximum flow rate and the coolant that is cooled by the radiator passes the TOC and the EOC to be supplied to the engine.
In the winter engine warm-up and heating mode, the control valve may open the third passage so as to maximize interior heating performance such that the high temperature coolant of the engine passes the heater to be supplied to the engine again.
In the winter heating and oil heating mode, the control valve may open the second passage and the third passage such that the high temperature coolant of the engine is supplied to the TOC and the EOC to circulate in the engine again.
In the winter heating and coolant temperature control mode, the control valve may open the first, second, and third passages such that the coolant circulates in the radiator, the TOC, the EOC, and the heater.
As described above, an engine cooling system for a vehicle and a control method thereof may control the flow direction and the flow rate of the coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved.
A motorized passage control type of 3-way valve is applied instead of a thermostat valve to quickly control the flow direction and flow rate of the coolant in accordance with operating conditions, and therefore operating reliability and efficiency of the system are improved.
Further, a coolant passage is formed to connect an engine, a radiator, a TOC, and an EOC such that coolant that is exhausted from an engine and a radiator is effectively supplied to a transmission oil cooler (TOC) and an engine oil cooler (EOC), wherein the layout of the system becomes simple, coolant is supplied to each constituent element in accordance with driving conditions, and the flow rate of the coolant can be optimized.
The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an exemplary engine cooling system for a vehicle according to the present invention.

FIG. 2 shows an operating condition of an exemplary engine cooling system in each summer mode for explaining a control method of an engine cooling system for a vehicle according to the present invention.

FIG. 3 shows an operating condition of an exemplary engine cooling system in each winter mode for explaining a control method of an engine cooling system for a vehicle according to the present invention.

FIG. 4 is a block diagram of an exemplary engine cooling system for a vehicle according to the present invention.

FIG. 5 is a block diagram of an exemplary engine cooling system for a vehicle according to the present invention.

DETAILED DESCRIPTION

Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
FIG. 1 is a block diagram of an engine cooling system for a vehicle according to various embodiments of the present invention.
Referring to the drawings, an engine cooling system 100 for a vehicle according to various embodiments of the present invention efficiently uses waste heat of an engine 101 and controls flow direction and flow rate of coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved and fuel consumption is reduced.
For this, in an engine cooling system for a vehicle 100 according to various embodiments of the present invention, as shown in FIG. 1, a water pump 103 that supplies an engine 101 with coolant is disposed at a coolant inlet side of the engine 101, and a radiator 105 is disposed to cool heated coolant passing the engine 101 through heat exchange with outside air.
Here, an engine cooling system for a vehicle 100 according to various embodiments of the present invention further includes a control valve 107, a first passage 109, a transmission oil cooler (TOC) 111, a second passage 113, and a heater 119.
In the meantime, the control valve 107 is disposed at a coolant outlet side of the engine 101 to control flow of coolant that is exhausted from the engine 101.
The first passage 109 connects the control valve 107 with the radiator 105 and connects the radiator 105 with the water pump 103.
In various embodiments, the TOC 111 is disposed between an outlet side of the radiator 105 and the water pump 103 in the first passage 109.
The second passage 113 connects the TOC 111 with the control valve 107 and bypasses the radiator to direct supply the TOC 111 with coolant that is exhausted from the engine 101.
Further, the heater 119 is disposed in a third passage 117 that connects the control valve 107 with the water pump 103.
Here, the control valve 107 can be a motorized passage control type 3-way valve, and the passages 109, 113, and 117 are selectively opened/closed or their opening rates can be respectively controlled by the control valve 107 such that flow rate of the high temperature coolant of the engine 101 is accurately controlled.
Meanwhile, in various embodiments, an engine oil cooler (EOC) 115 can be disposed on the second passage 113 that connects the control valve 107 with the first passage 109 between the TOC 111 and the water pump 103.
The EOC 115 can be disposed in parallel with the TOC 111, and the coolant of the radiator 105 can be distributed to the EOC 115 and the TOC 111.
Hereinafter, an operating and control method of an engine cooling system for a vehicle 100 according to various embodiments of the present invention will be described with reference to FIG. 2 and FIG. 3.
FIG. 2 shows an operating condition of an engine cooling system in each summer mode for explaining a control method of an engine cooling system for a vehicle according to various embodiments of the present invention, and FIG. 3 shows an operating condition of an engine cooling system in each winter mode for explaining a control method of an engine cooling system for a vehicle according to various embodiments of the present invention.
Referring to the drawings, the control method of an engine cooling system for a vehicle according to various embodiments of the present invention control controls flow of coolant by controlling the control valve 107 in accordance with a season mode of a vehicle in an engine cooling system 100 for a vehicle as described above.
Here, the season mode can be divided into a summer engine warm-up mode, a summer oil warm-up mode, a summer coolant temperature control mode, a summer maximum cooling performance demand mode, a winter engine warm-up mode, a winter engine warm-up mode, a heating mode, a heating and oil heating mode, and a heating and coolant temperature control mode.
Firstly, in the summer engine warm-up mode and the winter engine warm-up mode, as shown in S1 of FIG. 2 and S10 of FIG. 3, the control valve 109 controls the first, second, and third passage 109, 113, and 117 such that the coolant is not exhausted from the engine 101 to quickly raise the temperature of the engine 101.
Accordingly, in the summer and winter engine warm-up mode, the coolant does not reach the radiator 105 or the TOC 111, and a cylinder head, a cylinder block, and a metal surface of the engine 101 is quickly warmed up by the coolant.
In the summer oil warm-up mode of various embodiments, as shown in S2 of FIG. 2, the control valve 107 closes the first and third passages 109 and 117 and opens the second passage 113, so the heated coolant of the engine 101 circulates in the TOC 111 and the EOC 115, and the transmission oil and engine oil are heated by the coolant flowing in the TOC 111 and the EOC 115.
Here, the EOC 115 is disposed in parallel with the TOC 111 such that the coolant flowing in the first passage 109 and the second passage 113 is uniformly supplied to them with a predetermined flow rate.
Accordingly, in the summer oil warm-up mode, the high temperature coolant that is exhausted from the engine 101 circulates in the TOC 111 and the EOC 115 to heat the transmission oil and the engine oil, and therefore the waste heat of the engine quickly raises the temperature of each oil without an oil heating device.
In this case, the first passage 109 and the third passage 117 are closed, the coolant is prevented from being supplied to the radiator 105 and the heater 119, the high temperature coolant is supplied to the TOC 111 and the EOC 115, and therefore the oil is efficiently heated by the coolant.
In the summer coolant temperature control mode according to various embodiments, as shown in S3 of FIG. 2, the control valve 107 opens the first passage 109 that is connected to the radiator 105 and the second passage 113 such that the heated coolant of the engine 101 is mixed with the cooled coolant of the radiator 105 to be supplied to the TOC 111 and the engine 101.
Here, the coolant temperature that is supplied to the EOC 115 through the first passage 109 and the second passage 113 can vary and the flowing rate of the coolant can vary.
Accordingly, in the summer coolant temperature control mode, the high temperature coolant of the engine 101 is distributed by the control valve 107 to be supplied to the radiator 105, the TOC 111, and the EOC 115, and the temperature of the coolant that is supplied the engine 101 is controlled within an appropriate range.
In the summer maximum cooling performance mode according to various embodiments, as shown in S4 of FIG. 2, the control valve 109 opens the first passage 109 such that the coolant of the engine 101 is supplied to the radiator 105 in a maximum flow rate, and the cooled coolant of the radiator 105 passes the TOC 111 and the EOC 115 to be supplied to the engine 101 again.
That is, the summer maximum cooling performance mode demands maximum cooling performance of the engine 101, wherein all coolant of the engine 101 is supplied to the radiator 105 by the control valve 107 and all coolant that is supplied to the engine 101 is cooled by the outside air.
In this process, the flow rate of the coolant passing the radiator 105 can be maximized and the coolant cooled by the radiator 105 passes the TOC 111 and the EOC 115 to improve their oil cooling efficiency.
Meanwhile, in the summer maximum cooling performance mode, the third passage 117 is closed and the heated coolant is prevented from being supplied to the heater 119, and therefore the cooling performance can be improved.
Further, in the winter engine warm-up and heating mode according to various embodiments, as shown in S20 of FIG. 3, the control valve 107 opens the third passage 117 so as to improve the heating performance, and the heated coolant of the engine 101 passes the heater 119 to be supplied to the engine 101 again.
Thus, the high temperature coolant of the engine 101 passes the heater 119 and the interior heating efficiency is improved.
Simultaneously, the coolant passes the heater 119 to be supplied to the engine 101 in a condition in which the temperature is sustained higher than a predetermined value, and therefore the engine 101 can be quickly warmed up.
In the winter heating and oil heating mode according to various embodiments, as shown in FIG. 3, the control valve 107 opens the second passage 113 and the third passage 117 such that the high temperature coolant of the engine 101 is supplied to the TOC 111, the EOC 115, and the heater 119 and the coolant circulates in the engine 101 again.
Accordingly, an appropriate flow rate of the high temperature of the engine 101 is supplied to the second and third passages 113 and 117 by the control valve 107.
Thus, the high temperature coolant passes the TOC 111 and EOC 115 to heat oil and passes the heater 119 to improve heat exchange efficiency for heating interior air.
Here, the control valve 107 controls the opening rate of the second and third passage 113 and 117 to increase the flow rate of the coolant that is used for heating oil in a case that the fuel consumption efficiency is to be improved or an interior heating load is low.
Also, in the winter heating and coolant temperature control mode, as shown S40 of FIG. 3, the control valve 107 opens the first, second, and third passage 109, 113, and 117 such that the coolant circulates in the radiator 105, the TOC 111, the EOC 115, and the heater 119.
Accordingly, the temperature of the coolant circulating in the passages 109, 113, and 117 is appropriately sustained to circulate in the engine 101.
Accordingly, an engine cooling system for a vehicle and the control method thereof according to various embodiments of the present invention 100 efficiently uses waste heat of an engine 101 and controls the flow direction and the flow rate of coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved and fuel consumption is reduced.
Also, a motorized passage 3-way valve type of control valve 107 is applied instead of a thermostat valve, and the control valve 107 quickly controls the flow direction and the flow rate of coolant according to driving conditions to improve reliability of valve operation and efficiency of the entire system.
Also, a coolant passage is formed to connect an engine 101, a radiator 105, a TOC 111, and an EOC 115 such that coolant that is exhausted from an engine 101 and a radiator 105 is effectively supplied to a transmission oil cooler (TOC) 111 and an engine oil cooler (EOC) 115, wherein the layout of the system becomes simple, coolant is supplied to each constituent element in accordance with driving conditions, and the flow rate of the coolant can be maximized.
FIG. 4 is a block diagram of an engine cooling system for a vehicle according to various embodiments of the present invention.
Referring to the drawings, an engine cooling system for a vehicle according to various embodiments of the present invention 200 efficiently uses waste heat of an engine 201 and controls the flow direction and the flow rate of coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved and fuel consumption is reduced.
For this, in an engine cooling system for a vehicle 200 according to various embodiments of the present invention, as shown in FIG. 4, a water pump 203 that supplies an engine 201 with coolant is disposed at a coolant inlet side of the engine 201, and a radiator 205 is disposed to cool heated coolant passing the engine 201 through heat exchange with outside air.
Here, an engine cooling system for a vehicle 200 according to various embodiments of the present invention further includes a control valve 207, a first passage 209, a transmission oil cooler (TOC) 211, a second passage 213, and a heater 219.
In the meantime, the control valve 207 is disposed at a coolant outlet side of the engine 201 to control flow of coolant that is exhausted from the engine 201.
The first passage 209 connects the control valve 207 with the radiator 205 and connects the radiator 205 with the water pump 203.
In various embodiments, the TOC 211 is disposed between an outlet side of the radiator 205 and the water pump 203 in the first passage 209.
The second passage 213 connects the TOC 211 with the control valve 207 and bypasses the radiator to directly supply the TOC 211 with coolant that is exhausted from the engine 201.
Also, the heater 219 is disposed in a third passage 217 that connects the control valve 207 with the water pump 203.
Here, the control valve 207 can be a motorized passage control type of 3-way valve, and the passages 209, 213, and 217 are selectively opened/closed or their opening rates can be respectively controlled by the control valve 207 such that the flow rate of the high temperature coolant of the engine 201 is accurately controlled.
Meanwhile, in various embodiments, an engine oil cooler (EOC) 215 can be disposed in the second passage 213 that connects the control valve 207 with the first passage 209 between the TOC 211 and the water pump 103.
The EOC 115 can be disposed in parallel with the TOC 111, and the coolant of the radiator 105 can be distributed to the EOC 115 and the TOC 111.
Here, a bypass passage 221 can be formed between the radiator 205 and the water pump 203 and the passage 221 bypasses coolant that is exhausted from the radiator 205 to supply the water pump 205 with this.
In various embodiments of the present invention, an opening/closing valve 223 can be disposed on the bypass passage 221.
That is, an engine cooling system 200 for a vehicle according to various embodiments of the present invention increases the coolant flow rate of the radiator 205 through the bypass passage 221 and the opening/closing valve 223 when maximum cooling performance is demanded for a vehicle.
Also, the opening/closing valve 223 is opened according to driving conditions when the outside temperature is high and the coolant temperature is high to increase the flow rate of coolant circulating in the radiator 205 such that the coolant temperature is decreased.
FIG. 5 is a block diagram of an engine cooling system for a vehicle according to various embodiments of the present invention.
Referring to the drawings, an engine cooling system for a vehicle according to various embodiments of the present invention 300 efficiently uses waste heat of an engine 301 and controls the flow direction and the flow rate of coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved and fuel consumption is reduced.
For this, in an engine cooling system for a vehicle 300 according to various embodiments of the present invention, as shown in FIG. 5, a water pump 303 that supplies an engine 301 with coolant is disposed at a coolant inlet side of the engine 201, and a radiator 305 is disposed to cool heated coolant passing the engine 201 through heat exchange with outside air.
Here, an engine cooling system for a vehicle 300 according to various embodiments of the present invention further includes a control valve 307, a first passage 309, a transmission oil cooler (TOC) 311, an EOC 315, and a heater 319.
In the meantime, the control valve 307 is disposed at a coolant outlet side of the engine 301 to control flow of coolant that is exhausted from the engine 301.
The first passage 309 connects the control valve 307 with the radiator 305 and connects the radiator 305 with the water pump 303.
In various embodiments, the TOC 311 is disposed in the second passage 313 that is diverged between the radiator 305 and the water pump 303 to be connected to the control valve 307.
The EOC 315 is disposed in the second passage 313 in series with the TOC 311 and the EOC 315 is connected to the first passage 309 that is an outlet side of the radiator 305.
Also, the heater 319 is disposed in the third passage 317 that connects the control valve 307 with the water pump 303.
Here, an opening/closing valve 321 can be disposed in the first passage 309 between the radiator 305 and the water pump 303.
The engine cooling systems (200 and 300) for a vehicle according to the exemplary embodiments of FIG. 4 and FIG. 5 of the present invention have the same of similar functions and effects as the exemplary embodiment of FIG. 1 to FIG. 3, and therefore the detailed description thereof will be omitted.
Accordingly, in an engine cooling system (100, 200, and 300) for a vehicle and the control method thereof according to various embodiments of the present invention efficiently uses waste heat of an engine (101, 201, and 301) and controls the flow direction and flow rate of coolant in accordance with an engine warm-up process and an engine operating process to offer optimized cooling conditions such that cooling performance, air-conditioning performance, and heating performance of an engine are improved and fuel consumption is reduced.
Also, a motorized passage 3-way valve type of control valve (107, 207, and 307) is applied instead of a thermostat valve, and the control valve quickly controls the flow direction and the flow rate of coolant according to driving conditions to improve reliability of valve operation and efficiency of the entire system.
Further, a coolant passage is formed to connect an engine (101, 201, and 301), a radiator (105, 205, and 305), a TOC (111 211, and 311), and an EOC (115, 215, and 315) such that coolant that is exhausted from the engine (101, 201, and 301) and the radiator (105, 205, and 305) are effectively supplied to the TOC (111, 211, and 311) and the EOC (115, 215, and 315), wherein the layout of the system becomes simple, coolant is supplied to each constituent element in accordance with driving conditions, and the flow rate of coolant can be optimized.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.

Claims

What is claimed is:

1. An engine cooling system for a vehicle in which a water pump is disposed to supply an engine with a coolant and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air, comprising:

a control valve disposed at one side of the engine to control flow rate and flow passage of coolant;

a first passage that connects the control valve with the radiator and connects the radiator with the water pump;

a transmission oil cooler (TOC) disposed between an outlet of the radiator and the water pump to be connected through the first passage;

a second passage that connects the TOC with the control valve and direct supplies the TOC with the coolant exhausted from the engine; and

a heater disposed in a third passage that bypasses the engine to connect the control valve with the water pump.

2. The engine cooling system for a vehicle of claim 1, wherein the control valve is a 3-way valve electrically controlled.

3. The engine cooling system for a vehicle of claim 1, wherein an engine oil cooler (EOC) is disposed between the TOC and the water pump by connecting the first passage and the second passage.

4. The engine cooling system for a vehicle of claim 3, wherein the EOC is disposed in parallel with the TOC.

5. The engine cooling system for a vehicle of claim 1, wherein a bypass passage is formed between the radiator and the water pump, through which a part of the coolant exhausted from the radiator is bypassed and the bypassed coolant is supplied to the water pump.

6. The engine cooling system for a vehicle of claim 5, an opening/closing valve is disposed on the bypass passage

7. An engine cooling system for a vehicle in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of an engine and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air, comprising:

a control valve disposed at a coolant outlet side of the engine;

a first passage that connects the control valve and the radiator and connects the radiator and the water pump;

a transmission oil cooler (TOC) disposed in a second passage connected to the control valve between the radiator and the water pump and is connected to the first passage;

an engine oil cooler (EOC) serially disposed with the TOC on the second passage; and

a heater disposed in a third passage that connects the control valve with the water pump.

8. The engine cooling system for a vehicle of claim 7, wherein an opening/closing valve is disposed in the first passage between the radiator and the water pump.

9. A control method of an engine cooling system for a vehicle according to a season mode, in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of the engine, a radiator is disposed to cool the heated coolant of the engine through exchanging heat with outside air, a control valve is disposed at a coolant outlet side of the engine, wherein the control valve is connected with the radiator through a first passage, is connected to a transmission oil cooler (TOC) disposed in the first passage through a second passage, and is connected to a heater through a third passage, and an engine oil cooler (EOC) is disposed in parallel with the TOC between the first passage and the second passage,

wherein the season mode is divided into a summer engine warm-up mode, a summer oil warm-up mode, a summer coolant temperature control mode, and a summer maximum cooling performance demand mode, and a winter engine warm-up mode, a winter engine warm-up and heating mode, a heating and oil heating mode, and a heating and coolant temperature control mode, and

in the summer engine warm-up mode and the winter engine warm-up mode, the coolant is prevented from being exhausted from the engine and the control valve closes the first, second, and third passages so as to raise the engine temperature.

10. The control method of an engine cooling system for a vehicle of claim 9, in the summer oil warm-up mode, the control valve closes the first and third passages and opens the second passage such that the heated coolant of the engine is supplied to the TOC and the EOC to raise the temperature of the transmission oil and engine oil.

11. The control method of an engine cooling system for a vehicle of claim 9, wherein in the summer coolant temperature control mode, the control valve opens the first passage connected to the radiator and the second passage such that the cooled coolant of the radiator is mixed with the heated coolant of the engine and the mixed coolant having an appropriate temperature passes the TOC and the EOC to be supplied to the engine.

12. The control method of an engine cooling system for a vehicle of claim 10, wherein a predetermined flow rate of the coolant flowing in the first passage and the second passage passes the EOC.

13. The control method of an engine cooling system for a vehicle of claim 11, wherein a predetermined flow rate of the coolant flowing in the first passage and the second passage passes the EOC.

14. The control method of an engine cooling system for a vehicle of claim 9, wherein in the summer maximum cooling performance mode, the control valve opens the first passage such that the coolant exhausted from the engine is supplied to the radiator at a maximum flow rate and the coolant cooled by the radiator passes the TOC and the EOC to be supplied to the engine.

15. The control method of an engine cooling system for a vehicle of claim 9, wherein in the winter engine warm-up and heating mode, the control valve opens the third passage so as to maximize interior heating performance such that the high temperature coolant of the engine passes the heater to be supplied to the engine again.

16. The control method of an engine cooling system for a vehicle of claim 9, wherein in the winter heating and oil heating mode, the control valve opens the second passage and the third passage such that the high temperature coolant of the engine is supplied to the TOC and the EOC to circulate in the engine again.

17. The control method of an engine cooling system for a vehicle of claim 9, wherein in the winter heating and coolant temperature control mode, the control valve opens the first, second, and third passages such that the coolant circulates in the radiator, the TOC, the EOC, and the heater.