KR20180128145A - System for controlling temperature of transmission fluid - Google Patents

Abstract

The present invention relates to a transmission oil temperature control system, and a main object of the present invention is to provide a transmission oil temperature control system capable of always maintaining and controlling an ATF (transmission oil) temperature at an appropriate temperature regardless of a load condition of a vehicle. In order to achieve the above object, the present invention includes: an ATF warmer in which transmission oil (ATF) and engine cooling water pass through the ATF warmer and heat exchange is performed between the transmission oil and engine cooling water; an oil cooler for cooling the transmission oil while allowing the transmission oil to pass through the ATF warmer and then to move to the transmission side; a bypass line for bypassing the transmission oil passing through the ATF warmer to prevent the transmission oil from passing through the oil cooler; a first valve installed to open and close a flow path of a cooling water line connected to the ATF warmer; a second valve installed to selectively open and close the flow path of the bypass line and the flow path of an ATF circulation line between the oil cooler and the transmission side; a first temperature sensor for detecting the temperature of the transmission oil; and a control unit that controls driving of a first valve and a second valve in accordance with the temperature of the transmission oil detected by the first temperature sensor.

Description

Technical Field [0001] The present invention relates to a transmission oil temperature control system,

The present invention relates to a transmission oil temperature control system, and more particularly, to a system for maintaining and controlling the temperature of a transmission oil at an appropriate level.

As is known, the automatic transmission is a transmission that automatically shifts the vehicle according to the vehicle speed without requiring the driver's clutch operation or shifting operation, which is required in the manual transmission.

In such an automatic transmission, an automatic transmission fluid (ATF) is used to smoothly transmit the power of a vehicle drive source such as an engine or a motor to a drive shaft.

The ATF is used as a working fluid to transmit power in the torque converter of an automatic transmission. In addition, it is used as a working fluid for clutches, brakes, and valve bodies as well as lubrication and cooling for gears and bearings.

The ATF is provided with a frictional agent having an appropriate frictional coefficient to improve the durability of the clutch plate during clutch engagement. However, the torque may be increased due to frictional heating during torque transmission, and the temperature may gradually increase .

Also, the temperature of the ATF may rise during component lubrication and cooling.

Therefore, an oil cooler (mainly air cooling type) cooling the ATF to lower the temperature of the ATF is installed near the radiator of the vehicle, and the ATF (transmission oil) circulates through the oil cooler to prevent the temperature rise of the ATF.

On the other hand, when the ATF temperature is low, the operation efficiency of the ATF is low because the temperature of the ATF is low. In particular, when the temperature of the ATF is low, the viscosity of the fluid increases, Lt; / RTI >

The above-described oil cooler only cools the ATF and does not have a function to warm up the ATF if necessary, that is, a function to raise the temperature of the ATF in a low-temperature or cold-running condition.

Thus, an ATF warmer that raises the temperature of the ATF is known.

The ATF warmer is a device for heating the ATF to reduce friction and to improve the fuel efficiency of the vehicle. When the temperature of the ATF is low, the ATF is heated to lower the viscosity of the fluid, thereby inducing friction reduction and improving the fuel efficiency of the vehicle.

For this purpose, there is known an ATF warmer which uses an engine coolant as a heat source to heat the ATF, that is, an ATF warmer that raises the temperature of the ATF through heat exchange between the ATF and the high temperature engine coolant.

Such an ATF warmer is provided as a kind of heat exchanger capable of exchanging heat between the ATF and the engine cooling water passing through the ATF and the engine cooling water, respectively.

1 is a perspective view showing an example of an ATF warmer according to the prior art.

As shown in the figure, the ATF warmer 30 is provided with an inlet and an outlet for cooling water so that the engine cooling water flows into the ATF warmer 30 through the interior of the ATF warmer 30, and then the ATF is introduced into the ATF warmer 30, ATF inlet and outlet are provided.

Further, piping (31, 32, 33, 34) through which cooling water and ATF flow is connected to each of the mouth and the outlet.

2 shows an engine cooling water system and an ATF circulation system. The engine cooling system includes an engine cooling system including a radiator 11, a water pump 12 and a thermostat 13, a heater core 14 for vehicle air conditioning, 20) and the ATF warmer 30, respectively.

The engine cooling water is circulated along the cooling water circulation line 14 by the water pump 12 and the cooling water that has passed through the engine 10 flows through the heater core 15 and the thermostat 13, 12 to the engine 10 again.

When the radiator side internal flow path is opened in the thermostat 13, a part of the cooling water from the engine 10 passes through the radiator 11 and is cooled by the radiator 11 and then circulated back to the engine 10 .

The ATF from the transmission 20 is circulated to the transmission side after passing through the ATF warmer 30 and the engine cooling water from the engine 10 is passed through the ATF warmer 30 and then circulated back to the engine side, In the warmer 30, heat exchange is performed between the ATF and the engine cooling water.

In this configuration, the ATF warmer 30 warms up the ATF by using the engine cooling water heated by the engine 10 during the cold start, but if the temperature of the ATF rises to some extent, the temperature of the ATF Can be suppressed.

That is, if the temperature of the ATF is lower than the temperature of the engine cooling water, the engine cooling water will heat up during the heat exchange to raise the temperature of the ATF. If the temperature of the ATF becomes higher than the engine cooling water temperature, The temperature rise of the ATF can be suppressed.

Examples of prior art documents related to such ATF warmers are disclosed in Japanese Patent Application Laid-Open No. 10-2013-0065049 (June 19, 2013) and Japanese Patent Application Laid-Open No. 10-2016-0112403 (June 29, 2016).

However, since the conventional ATF warmer raises the temperature of the ATF (transmission oil) by using the engine cooling water, there is a problem that the temperature of the ATF may be excessively increased according to the load condition of the vehicle.

That is, if the temperature of the engine cooling water rises under a high load condition, the cooling function by the engine cooling water is weakened, and the temperature of the ATF may excessively rise, and the ATF may instantaneously boil or burn due to the excessive increase of the ATF temperature have.

This adversely affects the durability and safety of the transmission.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a transmission oil temperature control system capable of always controlling a temperature of an ATF (transmission oil) to an appropriate temperature regardless of a load condition of a vehicle, .

In order to achieve the above object, according to an embodiment of the present invention, there is provided an automatic transmission fluid (ATF), an ATF warmer through which engine cooling water passes, and heat exchange between a transmission oil and engine cooling water; An oil cooler for allowing the transmission oil to pass through the ATF warmer and then to the transmission side to pass therethrough while cooling the transmission oil; A bypass line for bypassing the transmission fluid passing through the ATF warmer to the transmission side so as not to pass through the oil cooler; A first valve installed to open and close a flow path of a cooling water line connected to the ATF warmer and to be opened and closed so that engine cooling water selectively flows to the ATF warmer; And an oil cooler for selectively opening and closing the flow path of the ATF circulation line between the oil cooler and the transmission side so that the transmission oil is operated to bypass the oil cooler or bypass the oil cooler A second valve; A first temperature sensor for detecting the temperature of the transmission oil; And a controller for controlling the driving of the first valve and the second valve in accordance with the temperature of the transmission fluid detected by the first temperature sensor.

Thus, according to the transmission oil temperature control system of the present invention, it is possible to maintain and control the ATF temperature using the ATF warmer and the oil cooler by controlling the ATF flow path according to the ATF temperature, and the ATF temperature It is possible to always maintain and control the temperature at an appropriate temperature.

1 is a perspective view showing an example of an ATF warmer according to the prior art.
2 is a view showing an engine cooling water and an ATF circulation system according to the prior art.
3 is a view showing a configuration of a transmission oil temperature control system according to an embodiment of the present invention.
4 is a block diagram showing a temperature sensor, a control unit, and a valve in a transmission oil temperature control system according to an embodiment of the present invention.
5 is a perspective view illustrating an oil cooler of a transmission oil temperature control system according to an embodiment of the present invention.
6 is a flowchart illustrating a process of controlling a transmission oil temperature 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 so that those skilled in the art can easily carry out the present invention. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

The main object of the present invention is to provide a transmission oil temperature control system capable of always maintaining and controlling the temperature of an ATF (transmission oil) at an appropriate temperature regardless of a load condition of a vehicle.

To this end, a temperature control system using a combination of an ATF warmer and an oil cooler is disclosed.

In the following description, the transmission fluid will be referred to as ATF.

FIG. 3 is a view showing a configuration of a transmission oil temperature control system according to an embodiment of the present invention. FIG. 4 is a block diagram of a control system for controlling the temperature of the transmission oil temperature control system according to the embodiment of the present invention. And valves 81 and 82, respectively.

As shown, the transmission oil temperature control system according to the embodiment of the present invention includes an ATF warmer 30, an oil cooler 40, a bypass line 56, first and second temperature sensors 61 and 62, A control unit 70, and first and second valves 81 and 82.

3 shows the engine cooling water and the ATF circulation system, and more particularly shows the configuration of the engine cooling system together with the configuration of the oil temperature control system according to the embodiment of the present invention.

In the configuration of the oil temperature control system according to the embodiment of the present invention, the configuration not shown in FIG. 3, that is, the first and second temperature sensors 61 and 62 and the control unit 70, Respectively.

3, there is no difference in the configuration of the engine cooling system and the circulation path of the engine cooling water in comparison with the known configuration. The engine cooling system includes a water pump 12 for circulating engine cooling water, And a thermostat 13 for controlling the flow path of the engine cooling water so that the engine cooling water selectively passes through the radiator 11.

The heater core 15 for vehicle air conditioning may also be installed in the engine coolant circulation line 14 in which the engine coolant is circulated, and there is no difference in comparison with the known configuration.

In the illustrated engine coolant circulation system, when the internal flow path on the radiator side of the thermostat 13 is closed, the coolant is heated by the engine 10 and then the heater core 15, the water pump 12, the thermostat 13, And then to the engine 10 again.

In the case where the internal flow path on the radiator side is opened in the thermostat 13, part of the high temperature cooling water from the engine 10 passes through the radiator 11 and air in the radiator 11 And then circulated to the engine 10 again along the path via the thermostat 13 and the water pump 12. [

The high temperature cooling water from the engine 10 is circulated to the engine 10 again along the path passing through the ATF warmer 30 and then through the thermostat 13 and the water pump 12, The ATF (transmission oil) from the ATF warmer 30 is also passed through the ATF warmer 30. As is known, in the ATF warmer 30, the ATF is heated by heat exchange between the ATF and the engine coolant.

The oil temperature control system according to the present invention further includes an oil cooler 40 for cooling the ATF. The ATF from the transmission 20 is passed through the ATF warmer 30 and then the oil cooler 40 is added As shown in FIG.

The oil cooler 40 may be provided as an air-cooled cooler like the radiator 11, and the ATF introduced into the oil cooler 40 is cooled by air passing around the oil cooler and then flows into the transmission 20 .

FIG. 5 is a perspective view showing an oil cooler of the transmission oil temperature control system according to the embodiment of the present invention. The oil cooler 40 has air introduced into the radiator 11 from the front end of the vehicle (may be running wind) To cool the ATF passing through it.

5, the oil cooler 40 may be disposed in the vicinity of the radiator 11, more specifically, in front of the radiator 11, and may be installed in a smaller size and volume than the radiator 11.

Since the radiator 11 is a well-known structure provided at the front end of the vehicle during the construction of the engine cooling system, detailed description thereof will be omitted. In the known engine cooling system, the rear of the radiator 11 A radiator fan 11a is provided, but only a part of the radiator fan 11a is shown in Fig.

In the transmission oil temperature control system of the present invention, the ATF passing through the ATF warmer 30 after passing through the transmission 20 selectively passes through the oil cooler 40, and passes through the oil cooler 40 And one ATF is supplied to the transmission 20 again.

An ATF inlet line 53 through which the ATF flows to the ATF warmer 30 in the transmission 20 is connected between the transmission 20 side and the ATF inlet side of the ATF warmer 30 and the ATF warmer 30 The first ATF circulation line 54 is connected between the ATF outlet side of the ATF warmer 30 and the ATF inlet side of the oil cooler 40 so that the ATF through the oil cooler 40 can flow into the oil cooler 40. [

A second ATF circulation line 55 is connected between the ATF outlet side of the oil cooler 40 and the transmission 20 side.

As a result, the ATF flowing along the first ATF circulation line 54 in the ATF warmer 30 flows into the oil cooler 40 and is cooled by the air (which may be the running wind) passing around in the oil cooler, Thereafter, the cooled ATF is discharged to the second ATF circulation line 55 and then flows to the transmission 20 side.

Between the first ATF circulation line 54 and the second ATF circulation line 55 there is provided a bypass line 56 for bypassing the ATF warmer 30 through the oil cooler 40 ).

In addition, a cooling water inlet line 51 branched from the cooling water circulation line 14, which flows after the high-temperature engine cooling water is discharged from the engine 10, is connected to the cooling water inlet side of the ATF warmer 30.

The coolant outlet port of the ATF warmer 30 is connected to the coolant circulation line 14 so that the engine coolant that has passed through the ATF warmer 30 and has undergone heat exchange with the ATF can flow to the coolant circulation line 14. [ Line 52 is provided.

At this time, the cooling water inlet line 51 can be branched from the cooling water circulation line 14 between the engine 10 and the heater core 15 and connected to the cooling water inlet side of the ATF warmer 30, To the cooling water circulation line 14 on the downstream side (downstream side) of the heater core 15 from the cooling water outlet side of the ATF warmer 30.

In addition, the oil temperature control system according to the present invention includes valves (81, 82) for determining the flow path of the ATF, a control unit for outputting control signals for controlling the driving of the valves according to the ATF temperature and the engine coolant temperature 70).

The valves 81 and 82 are electronic valves whose driving is controlled by the control unit 70 and include a first valve 81 for selectively controlling the entry and exit of engine cooling water into and from the ATF warmer 30, And a second valve 82 mounted on the bypass line 56 for controlling the ATF discharged from the oil cooler 40 to pass through the oil cooler 40 selectively.

The first valve 81 may be provided to open and close the flow passage of the cooling water line connected to the ATF warmer and the second valve 82 may be provided to open and close the flow passage of the bypass line 56, And the oil cooler side line 55a to the transmission side line 55b and to switch the connection thereof.

The first valve 81 is connected to the cooling water inlet line 51 connected to the cooling water inlet side of the ATF warmer 30 in the cooling water circulation line 14 or the cooling water inlet line 51 connected to the cooling water circulation line 14 (Not shown).

In the embodiment of FIG. 3, the first valve 81 is provided in the cooling water inlet line 51.

The second valve 82 may be a three-way valve installed at an outlet of the bypass line 56 and an outlet of the second ATF circulation line 55.

When the first valve 81 is closed, the high temperature engine cooling water discharged from the engine 10 is prevented from flowing through the ATF warmer 30. At this time, the engine cooling water flows from the engine 10 through the heater core 15 only The back thermostat 13 and the water pump 12 to the engine 10 again.

On the other hand, when the first valve 81 is opened, the high-temperature engine cooling water discharged from the engine 10 flows through the ATF warmer 30. Thus, in the ATF warmer 30, heat exchange between the ATF and the engine cooling water .

At this time, the ATF can be heated by the engine coolant in the ATF warmer 30 under the condition that the ATF temperature is lower than the engine coolant temperature. On the other hand, when the ATF temperature is higher than the engine coolant temperature, ATF can be cooled.

The second valve 82 is connected to the line 55b connected to the transmission 20 side of the second ATF circulation line 55 and the line 55a connected to the oil cooler 40 side and the bypass line 56 The port to which the bypass line 56 is connected is referred to as a first port 83a and the port of the second ATF circulation line 55 to which the transmission line 55a is connected is referred to as a second port Port 83b and the port of the second ATF circulation line 55 to which the oil cooler side line 55b is connected will be referred to as a third port 83c.

The second valve 82 is connected to the internal line and the first port 83a to which the bypass line 56 is connected and the internal line 55a to which the transmission line 55a of the second ATF circulation line 55 is connected, The second port 83b and the third port 83c connected to the oil cooler side line 55b of the second ATF circulation line 55 are closed and the bypass line 56 is closed, The oil cooler side line 55b is cut off and the bypass line 56 and the transmission side line 55a of the second ATF circulation line 55 are connected.

In this case, the ATF that has passed through the ATF inlet line 53 from the transmission 20 and has passed through the ATF warmer 30 is transmitted to the transmission 20 side via the first ATF circulation line 54 and the bypass line 56 Can be reintroduced.

The second valve 82 is connected to the second port 83b connected to the transmission side line 55a of the second ATF circulation line 55 and the second port 83b connected to the oil of the second ATF circulation line 55 When the internal flow path to which the cooler side line 55b is connected and the internal flow path to which the bypass line 56 is connected and the first port 83a are closed while the third port 83c is opened, 56 are closed and the oil cooler side line 55b is opened and the oil cooler side line 55b of the second ATF circulation line 55 and the transmission side line 55a of the second ATF circulation line 55 ) Is connected.

In this case, the ATF that has passed through the ATF inlet line 53 from the transmission 20 and then passes through the ATF warmer 30 is supplied to the first ATF circulation line 54, the oil cooler 40, the second ATF circulation line 55 To the transmission 20 side.

The oil temperature control system according to the embodiment of the present invention further includes a first temperature sensor 61 for detecting the temperature of the transmission fluid, that is, the ATF, and a second temperature sensor 62 for detecting the temperature of the engine coolant do.

The first temperature sensor 61 may be installed to detect the temperature of the ATF before it is introduced into the ATF warmer 30 and may be provided on the side of the transmission 20 or the ATF inlet line 53).

Further, the second temperature sensor 62 may be a known water temperature sensor for detecting the engine coolant temperature.

The second temperature sensor 62 may be a separate temperature sensor installed to detect the temperature of the engine coolant before entering the ATF warmer 30. For example, Or may be installed in the cooling water inlet line 51 branched from the cooling water circulation line 14.

Hereinafter, an operation state and an oil temperature control process of the oil temperature control system according to the embodiment of the present invention will be described with reference to FIG.

6 is a flowchart illustrating an oil temperature control process according to an embodiment of the present invention.

In the present invention, when the temperature of the transmission oil, that is, the temperature of the ATF, is equal to or lower than a predetermined reference temperature set in the controller 70, the ATF is circulated so as to pass through only the ATF warmer 30, The ATF is circulated so as to pass both the water-cooled ATF warmer 30 and the air-cooled oil cooler 40.

This ATF circulation path and flow control can be performed by the control unit 70 controlling the driving of the first valve 81 and the second valve 82 and the control unit 70 can control the first temperature sensor 61 and the second valve 82 2 control signal for controlling the driving of the first valve 81 and the second valve 82 in accordance with the sensor value of the second temperature sensor 62, that is, the ATF and the engine coolant temperature detection value.

The reference temperature can be set to a maximum temperature at which the fuel economy can be improved by maintaining the ATF viscosity at an appropriate level. When the ATF temperature is higher than the reference temperature, the control unit 70 determines that the ATF is in an overtemperature state .

First, when the vehicle is started, that is, when the ignition key is turned on, the temperature control system of the present invention is automatically turned on (S11), and then the controller 70 controls the first valve 81 And outputs a control signal for opening.

Accordingly, the first valve 81 is opened (S12) in accordance with the control signal of the control unit 70, so that a part of the high temperature engine cooling water discharged from the engine 10 is supplied to the cooling water inlet line 51, the ATF warmer 30 ), And a cooling water outlet line (52).

The control unit 70 receives the detection signals of the first temperature sensor 61 and the second temperature sensor 62. At this time, the control unit 70 detects the ATF temperature, which is the detection value of the first temperature sensor 61, And is compared with a preset reference temperature (S13).

When the ATF temperature detected by the first temperature sensor 61 is in an over-temperature condition higher than the reference temperature, the controller 70 generates a control signal for opening the ATF flow path passing through the oil cooler 40, And outputs a control signal for setting the flow path of the ATF to pass through the oil cooler 40 (S14).

That is, the control unit 70 closes the bypass line 56 and opens the oil cooler-side line 55b of the second ATF circulation line 55 and the transmission-side line 55a of the second ATF circulation line 55 And outputs a control signal for a predetermined period.

At this time, in accordance with the control signal of the control unit 70, in the second valve 82, the internal flow path and the second port 83b to which the transmission side line 55a of the second ATF circulation line 55 is connected, An internal flow path to which the oil cooler side line 55b of the ATF circulation line 55 is connected and an internal flow path in which the third port 83c is opened and the bypass line 56 is connected, ) Is closed.

As a result, the oil cooler side line 55b of the second ATF circulation line 55 and the transmission side line 55a of the second ATF circulation line 55 are connected and the oil cooler side line 55b is opened, The ATF inlet line 53, the ATF warmer 30, the first ATF circulation line 54, the oil cooler 40, the second ATF circulation line 54, Cooler-side line 55b of the second ATF circulation line 55 and the transmission-side line 55a.

Thus, the ATF is further cooled by the air cooling type while passing through the oil cooler 40 after the heat exchange with the engine cooling water is performed in the ATF warmer 30, and then the cooled ATF flows into the transmission 20 side again.

In this process, the ATF is firstly cooled from the high temperature superheated state to the intermediate temperature by the engine coolant in the ATF warmer 30, and then the temperature is lower than the reference temperature at the middle temperature by the air passing around in the oil cooler 40 Lt; / RTI >

The ATF is set so as to circulate the transmission 20, the ATF warmer 30, the oil cooler 40, and the transmission 20 under the overtemperature condition where the ATF temperature is higher than the reference temperature, The ATF secondary cooling in the oil cooler 40 is continued after the ATF primary cooling in the ATF warmer 30 until the ATF warmer 30 is cooled.

If the ATF temperature detected by the first temperature sensor 61 is lower than the reference temperature or lower than the reference temperature after the step S14 in the step S13, the control unit 70 passes through the bypass line 56 And outputs a control signal for opening the ATF flow path, that is, a control signal for opening the bypass line 56 (S15).

That is, the control unit 70 closes the oil cooler side line 55b of the second ATF circulation line 55 and opens the transmission side line 55a of the bypass line 56 and the second ATF circulation line 55 And outputs a control signal for a predetermined period.

At this time, in accordance with the control signal of the control unit 70, the second valve 82 is provided with an internal flow path and a first port 83a to which the bypass line 56 is connected and a transmission port side of the second ATF circulation line 55 The internal flow path to which the line 55a is connected and the second port 83b are opened and the oil cooler side line 55b of the second ATF circulation line 55 is connected to the internal flow path and the third port 83c ) Is closed.

As a result, the bypass line 56 and the transmission side line 55a of the second ATF circulation line 55 are connected, and the bypass line 56 is opened and the oil cooler side line 55b is disconnected So that the ATF from the transmission 20 is transmitted to the ATF inlet line 53, the ATF warmer 30, the first ATF circulation line 54, the bypass line 56 and the second ATF circulation line 55 And flows through the transmission side line 55a.

Thus, since the flow path for bypassing the ATF is set so as not to pass through the oil cooler 40, the ATF only flows into the transmission 20 after the heat exchange with the engine cooling water is performed in the ATF warmer 30.

Thereafter, the control unit 70 compares the ATF temperature detected by the first temperature sensor 61 with the cooling water temperature detected by the second temperature sensor 62 (S16). If the ATF temperature is lower than the engine cooling water temperature The ATF warmer 30 performs heat exchange between the ATF and the engine coolant water by maintaining the bypass line 56 in an opened state (moving to 'return' in FIG. 6) To be heated.

If the ATF temperature is lower than the engine coolant temperature and the system on condition of step S11 is satisfied and the condition of step S13 is not satisfied, the open state of the bypass line 56 is maintained. If the condition of step S13 is satisfied, .

On the other hand, if the ATF temperature is equal to or higher than the cooling water temperature in step S16, a control signal for closing the first valve 81 installed on the cooling water inlet line 51 is outputted (S17).

Thereby, the first valve 81 is closed, the engine cooling water does not flow to the ATF warmer 30, and the cooling water path passing through the ATF warmer 30 is shut off.

In this case, the engine cooling water does not pass through the ATF warmer 30 (ATF warmer circulation of the engine coolant), so that the heat exchange in the ATF warmer 30, that is, the heat exchange between the ATF and the engine coolant water, The lubrication and cooling action of the ATF in the transmission 20, and the friction of the ATF.

In this way, the heat exchange between the engine cooling water and the ATF is not performed under the condition that the ATF temperature is equal to or higher than the cooling water temperature, thereby preventing the ATF temperature from rising under the high engine load condition. As a result, the transmission side durability and stability The degradation problem can be solved.

Thus, according to the transmission oil temperature control system according to the present invention, it is possible to maintain the ATF temperature at an appropriate temperature, to prevent the ATF temperature from rising to an excessive temperature, The problem of the durability and the stability of the transmission side can be solved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And are also included in the scope of the present invention.

10: Engine 11: Radiator
12: Water pump 13: Thermostat
14: cooling water circulation line 15: heater core
20: Transmission 30: ATF Warmer
40: Oil cooler 51: Cooling water inlet line
52: Cooling water outlet line 53: ATF inlet line
54: first ATF circulation line 55: second ATF circulation line
55a: transmission side line 55b: oil cooler side line
56: bypass line 61: first temperature sensor
62: second temperature sensor 70:
81: first valve 82: second valve
83a: first port 83b: second port
83c: third port

Claims (9)

ATF warmers that allow transmission fluid (ATF) and engine coolant to pass through and heat exchange between transmission fluid and engine coolant;
An oil cooler for allowing the transmission oil to pass through the ATF warmer and then to the transmission side to pass therethrough while cooling the transmission oil;
A bypass line for bypassing the transmission fluid passing through the ATF warmer to the transmission side so as not to pass through the oil cooler;
A first valve installed to open and close a flow path of a cooling water line connected to the ATF warmer and to be opened and closed so that engine cooling water selectively flows to the ATF warmer;
And an oil cooler for selectively opening and closing the flow path of the ATF circulation line between the oil cooler and the transmission side so that the transmission oil is operated to bypass the oil cooler or bypass the oil cooler A second valve;
A first temperature sensor for detecting the temperature of the transmission oil; And
And a controller for controlling the driving of the first valve and the second valve in accordance with the temperature of the transmission fluid detected by the first temperature sensor.
The method according to claim 1,
Wherein the oil cooler is an air-cooled cooler installed in the vicinity of a vehicle radiator for cooling the engine coolant, and cooling the transmission oil passing through the inside by the air flowing into the radiator.
The method according to claim 1,
The cooling water inlet line branched from the engine cooling water circulation line through which the engine cooling water circulates is connected to the cooling water inlet side of the ATF warmer as a cooling water line connected to the ATF warmer,
The cooling water outlet line through which the engine cooling water passed through the ATF warmer is discharged is connected to the engine cooling water circulation line at the cooling water outlet side of the ATF warmer,
Wherein the first valve is installed in the cooling water inlet line or the cooling water outlet line.
The method according to claim 1,
The ATF inlet line is connected between the transmission side and the ATF inlet side of the ATF warmer so that the transmission oil can be flowed from the transmission side to the ATF warmer,
The first ATF circulation line is connected between the ATF outlet side of the ATF warmer and the ATF inlet side of the oil cooler so that the transmission oil passing through the ATF warmer can be introduced into the oil cooler,
A second ATF circulation line is connected between the ATF outlet side of the oil cooler and the transmission side so that the transmission fluid that has passed through the oil cooler can flow into the transmission side,
Wherein the bypass line is connected between the first ATF circulation line and the second ATF circulation line.
The method of claim 4,
Wherein the second valve comprises:
A second ATF circulation line connected to the first ATF circulation line,
One of the flow path of the bypass line and the oil cooler side line connected to the ATF outlet side of the oil cooler among the second ATF circulation lines is opened,
Way valve for connecting one of the first and second open-circulated flow lines to the transmission side line connected to the transmission side of the second ATF circulation line.
The method according to claim 1,
Wherein,
When the temperature of the transmission oil detected by the first temperature sensor is higher than a preset reference temperature, the flow path of the bypass line is blocked and the flow path of the ATF circulation line between the oil cooler and the transmission side is opened, So as to allow the transmission fluid to pass through the ATF warmer and the oil cooler in order.
The method according to claim 1,
Wherein,
And a second valve for opening the flow path of the bypass line and interrupting the flow path of the ATF circulation line between the oil cooler and the transmission side when the temperature of the transmission fluid detected by the first temperature sensor is equal to or lower than a preset reference temperature Wherein the transmission is controlled to bypass the transmission oil passing through the ATF warmer along the bypass line so as not to pass through the oil cooler.
The method according to claim 1,
Further comprising a second temperature sensor for detecting the temperature of the engine coolant,
Wherein,
Wherein the control means controls the drive of the first valve and the second valve in accordance with the temperature of the transmission fluid detected by the first temperature sensor and the temperature of the engine cooling water detected by the second temperature sensor. Oil temperature control system.
The method of claim 8,
Wherein,
When the temperature of the transmission fluid detected by the first temperature sensor is equal to or lower than a preset reference temperature and the temperature of the transmission oil is equal to or higher than the temperature of the engine cooling water detected by the second temperature sensor, , So that the engine coolant does not flow through the ATF warmer.

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