KR101755484B1 - Apparatus for controlling oil pump of automatic transmission and method thereof - Google Patents

Apparatus for controlling oil pump of automatic transmission and method thereof Download PDF

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Publication number
KR101755484B1
KR101755484B1 KR1020150175295A KR20150175295A KR101755484B1 KR 101755484 B1 KR101755484 B1 KR 101755484B1 KR 1020150175295 A KR1020150175295 A KR 1020150175295A KR 20150175295 A KR20150175295 A KR 20150175295A KR 101755484 B1 KR101755484 B1 KR 101755484B1
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KR
South Korea
Prior art keywords
oil pump
oil
rpm
driving
solenoid valve
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KR1020150175295A
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Korean (ko)
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KR20170068280A (en
Inventor
황진영
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현대자동차 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0436—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/42—Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/431—Pump capacity control by electro-hydraulic control means, e.g. using solenoid valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The present invention relates to an oil pump control apparatus for an automatic transmission, and more particularly, to an oil pump control apparatus and method for an automatic transmission that includes two oil pumps and can prevent a hydraulic under- .
To this end, an oil pump control apparatus for an automatic transmission according to an embodiment of the present invention includes a first oil pump driven by a driving force of an engine and sucking oil in an oil tank to discharge a hydraulic pressure to a first oil path, A second oil pump driven by the first oil pump to suck the oil in the oil tank and discharge the oil pressure to the second oil path, a recirculation passage for supplying the oil pressure discharged from the first oil pump back to the first oil pump, A solenoid valve for controlling the switch valve so that the discharged oil pressure is selectively supplied to the first flow path and the recirculation flow path; and a solenoid valve for controlling the first oil pump and the second oil pump And then switching from the first oil pump to the second oil pump or switching from the second oil pump to the first oil pump.

Figure R1020150175295

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump control apparatus for an automatic transmission,

The present invention relates to an oil pump control apparatus for an automatic transmission, and more particularly, to an oil pump control apparatus and method for an automatic transmission, which includes two oil pumps and can prevent a hydraulic under- .

In order to satisfy such demands, the automobile manufacturers are required to develop the technology to reduce fuel consumption as the demand for environmentally friendly vehicles is increased due to the constant fuel efficiency improvement required for the vehicles according to the worldwide high oil prices. .

The improvement of the fuel economy in the automatic transmission can be achieved by improving the power transmission efficiency, and the improvement of the power transmission efficiency can be realized by minimizing unnecessary consumption power of the oil pump.

As described above, in order to improve the fuel economy, the oil pump applied to the automatic transmission is divided into two. The oil pressure generated by the first oil pump is supplied to the low-pressure portion (torque converter, cooling, lubrication), and the oil pressure generated by the second oil pump is supplied to the high-pressure portion (friction member selectively operated upon shifting).

More specifically, it has a configuration for generating the entire hydraulic pressure on the basis of the low-pressure portion, and at the same time, only a part of the hydraulic pressure required by the high-pressure portion is controlled to a high pressure and supplied to the high-

Accordingly, the consumption power for driving the oil pump can be minimized, thereby improving the fuel efficiency. In addition, the load applied to the oil pump can be reduced, thereby reducing the noise and vibration and improving the durability.

However, in the conventional case, a phenomenon occurs that the flow rate temporarily becomes insufficient in the mode switching period of the first oil pump and the second oil pump.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

An embodiment of the present invention provides an apparatus and method for controlling an oil pump for an automatic transmission that can prevent a shape temporarily lacking a flow rate in a mode switching period of a first oil pump and a second oil pump.

An embodiment of the present invention provides an oil pump control apparatus and method for an automatic transmission that can overlap the operation of a first oil pump and a second oil pump in a mode switching period of a first oil pump and a second oil pump .

In an embodiment of the present invention, a first oil pump driven by a driving force of an engine and sucking oil in an oil tank and discharging oil pressure through a first oil path; A second oil pump driven by the driving force of the motor to suck the oil in the oil tank and discharge the oil pressure to the second oil path; A recirculation passage for supplying the hydraulic pressure discharged from the first oil pump to the first oil pump again; A solenoid valve for controlling the switch valve to selectively supply the hydraulic pressure discharged from the first oil pump to the first flow path and the recirculation flow path; And a second mode in which the first oil pump and the second oil pump are operated simultaneously during the set time of mode switching between the first oil pump and the second oil pump, and then the first oil pump is switched to the second oil pump, 1 < / RTI > oil pump for controlling an oil pump for an automatic transmission.

When the mode is switched from the first oil pump to the second oil pump, the controller drives the second oil pump to the first RPM, drives the second oil pump to the second RPM after operating the solenoid valve, .

When the mode is switched from the first oil pump to the second oil pump, the controller drives the second oil pump to the first RPM at the first time point, and drives the second oil pump to the second RPM at the first point in time, The solenoid valve may be operated at a time point and the second oil pump may be driven to the second PRM at a third time point at which the second set time has elapsed at the second time point.

When the mode is switched from the first oil pump to the second oil pump, the controller checks the oil temperature of the transmission and the driving RPM of the first oil pump, confirms the first RPM according to the oil temperature of the transmission and the driving RPM, The second oil pump can be driven at the speed of the first RPM.

In addition, the controller may operate the solenoid valve when the mode is switched from the second oil pump to the first oil pump, and stop the operation of the second oil pump after the third predetermined time has elapsed.

Further, when the solenoid valve is operated under the control of the controller, the switch valve may be connected to the recirculation passage to supply the hydraulic pressure of the first oil pump to the first oil pump again.

In another embodiment of the present invention, there is provided a method of controlling a first oil pump driven by a driving force of an engine and a second oil pump driven by a driving force of the motor, the method comprising: driving a first oil pump; Driving the second oil pump to the first RPM by confirming the mode change according to the operation state information; Operating a solenoid valve; And driving the second oil pump to a second PRM.

The embodiment of the present invention can prevent the hydraulic under-shooting phenomenon due to pressure leakage by overlapping the operation of the first oil pump in the mode switching period of the first oil pump and the second oil pump.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a view showing an oil pump control apparatus for an automatic transmission according to an embodiment of the present invention.
2 is a flowchart illustrating an oil pump control method for an automatic transmission according to an embodiment of the present invention.
3 is an exemplary view for explaining an oil pump control method for an automatic transmission according to an embodiment of the present invention.
4 is a flowchart illustrating an oil pump control method for an automatic transmission according to another embodiment of the present invention.
5 is a diagram illustrating an oil pump control method for an automatic transmission according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation principle of an embodiment of an oil pump control apparatus and method for an automatic transmission according to the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory of various embodiments for effectively illustrating the features of the present invention. Therefore, the present invention should not be limited to the following drawings and descriptions.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

In order to efficiently explain the essential technical features of the present invention, the following embodiments will appropriately modify, integrate, or separate terms to be understood by those skilled in the art to which the present invention belongs , And the present invention is by no means thereby limited.

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

1 is a view showing an oil pump control apparatus for an automatic transmission according to an embodiment of the present invention.

1, an oil pump control apparatus 100 for an automatic transmission 190 according to an embodiment of the present invention includes a state detection unit 30, an oil tank 110, an engine 120, a first oil pump 130 A motor 140, a second oil pump 150, a switch valve 160, a solenoid valve 170, a regulator valve 180, an automatic transmission 190, and a controller 200.

The state detecting unit 30 detects the operating state information for controlling the first oil pump 130 and the second oil pump 150 and provides the detected state information to the controller 200. That is, the state detecting unit 30 detects the state of the vehicle, including the displacement (opening amount) of the accelerator pedal operated by the driver, the vehicle speed detected from the output shaft rotational speed of the transmission, the gear stage currently synchronized with the transmission, And the operation state information is detected.

The state detection unit 30 detects the drive RPM, which is the rotation speed of the first oil pump 130, and provides it to the controller 200.

The oil tank 110 stores oil necessary for operating the automatic transmission 190.

The engine 120 drives the second oil pump 150. That is, the engine 120 can drive the second oil pump 150 connected to the rotating shaft.

The first oil pump 130 drives the oil stored in the oil tank 110 to supply the oil pressure to the automatic transmission 190. That is, the first oil pump 130 is driven by the driving force of the engine 120, sucks the oil in the oil tank 110, and discharges the oil pressure to the first oil path 50. The first oil pump 130 may be a mechanical oil pump.

The motor 140 drives the first oil pump 130. That is, the motor 140 may be driven at a predetermined RPM in accordance with the control of the controller 200 to drive the second oil pump 150 connected to the rotary shaft.

The second oil pump 150 drives the oil stored in the oil tank 110 to supply the oil pressure to the automatic transmission 190. That is, the second oil pump 150 generates the oil pressure by driving the oil stored in the oil tank 110 by the driving force of the motor 140, discharges the generated oil pressure through the second oil passage 60, (190). The second oil pump 150 may be an electric oil pump.

The switch valve 160 is installed on the first flow path 50. The switch valve 160 allows the hydraulic pressure discharged from the first oil pump 130 to be selectively supplied to the first flow path 50 and the recirculation flow path 70 under the control of the solenoid valve 170. At this time, the recirculation passage 70 is connected to the first oil passage 50 by the switch valve 160 to supply the oil pressure discharged from the first oil pump 130 to the first oil pump 130 again.

The solenoid valve 170 controls the switch valve 160 under the control of the controller 200.

The regulator valve 180 is connected to the first flow path 50 and the second flow path 60 to maintain the hydraulic pressure supplied to the automatic transmission 190 constant. That is, the regulator valve 180 controls the oil pressure discharged from the first oil pump 130 and the oil pressure discharged from the second oil pump 150 to a stable oil pressure, and supplies the oil pressure to the automatic transmission 190.

The automatic transmission 190 is operated based on the hydraulic pressure supplied from the first oil pump 130 and the second oil pump 150. [ In other words, the automatic transmission 190 is engaged and disengaged by the friction elements constituted by the operation of the hydraulic pressure, and the automatic transmission 190 joins the target speed change stage suitable for the current operating conditions.

The controller 200 determines the target speed change stage by analyzing the operation state information provided by the state detection unit 30 and controls the first oil pump 130 and the second oil pump 150 based on the target speed change stage .

The controller 200 confirms the mode change based on the operation state information and controls the first oil pump 130 and the second oil pump 150 to operate simultaneously during the set time when the mode change is confirmed. At this time, the set time is a preset time for preventing a phenomenon in which the hydraulic pressure is insufficient at the time of mode switching, and may be a preset value.

In other words, when the mode is switched from the first oil pump 130 to the second oil pump 150, the controller 200 controls the second oil pump 150 in a state in which the first oil pump 130 is driven And operates the solenoid valve 170 at a predetermined time in the set time. The reason for operating the solenoid valve 170 is that the solenoid valve 170 is operated so that the switch valve 160 connects the first flow path 50 to the recirculation flow path 70 and discharges The first oil pump 130 is idly rotated by supplying the hydraulic pressure to the first oil pump 130 so that the first oil pump 130 can be operated without interrupting the connection between the engine 120 and the first oil pump 130. [ This is because power can be cut off.

The controller 200 simultaneously drives the first oil pump 130 and the second oil pump 150 when the mode is switched from the second oil pump 150 to the first oil pump 130, The operation of the solenoid valve 170 is stopped and the driving of the second oil pump 150 is stopped.

For this purpose, the controller 200 may be implemented with one or more microprocessors operating with the program set up, and the program may be implemented as a set of programs for performing each step included in the oil bump according to an embodiment of the present invention Command may be included.

The controller 200 will be described in more detail with reference to FIGS. 2 to 4. FIG.

2 and 3, a method of switching the mode from the first oil pump 130 to the second oil pump 150 will be described.

2 is a flowchart illustrating an oil pump control method for an automatic transmission according to an embodiment of the present invention.

Referring to FIG. 2, the controller 200 drives the first oil pump 130 through the engine 120 (S210). At this time, the first oil pump 130 may be driven by a constant RPM 310 as shown in FIG. 3 (a).

The controller 200 confirms the mode change based on the operation state information (S220).

When the controller 200 confirms the mode change, the controller 200 checks the oil temperature of the transmission and the driving RPM of the first oil pump 130 (S230). Here, the oil temperature of the transmission may indicate the temperature inside the automatic transmission 190. [ The driving RPM of the first oil pump 130 may indicate the RPM at which the first oil pump 130 is currently rotating.

The controller 200 drives the second oil pump 150 at a first RPM according to the oil temperature of the transmission and the driving RPM of the first oil pump 130 at step S240. Specifically, the controller 200 confirms a drive control map that matches the oil temperature of the transmission and the rotational speed of the first oil pump 130 with the rotational speed of the second oil pump 150. At this time, the drive control map is a preset map, and may be set by a predetermined algorithm (for example, a program and a probability model) or may be set by an operator.

The controller 200 detects the first RPM matched to the oil temperature and the driving RPM identified in step S230 in the drive control map. The controller 200 controls the motor 140 to drive the second oil pump 150 to the first RPM. That is, the controller 200 may drive the second oil pump 150 with the first RPM 320 at a first time point t1 as shown in FIG. 3A.

The controller 200 activates the solenoid valve 170 (S250). In other words, the controller 200 operates the solenoid valve 170 to stop the power of the first oil pump 130 to achieve the same effect. That is, as shown in FIG. 3 (b), the controller 200 operates the solenoid valve 170 at a second time t2 after the first set time H1 has passed at the first time t1 . At this time, the switch valve 160 is connected to the recirculation passage 70 by the solenoid valve 170 so that the hydraulic pressure discharged from the first oil pump 130 is returned to the first oil pump 130, As shown in FIG.

The controller 200 drives the second oil pump 150 with the second RPM (S260). In other words, the controller 200 controls the motor 140 to drive the second oil pump 150 to the second RPM. That is, as shown in (a) of FIG. 3, the controller 200 controls the second oil pump 2 at the second RPM to the third point of time t3 after the second preset time H2 flows at the second point of time t2, (150) can be driven.

3 (c), when the mode is switched from the first oil pump 130 to the second oil pump 150, the oil pump control apparatus 100 for the automatic transmission 190 changes the mode The oil pressure under-shooting phenomenon can be prevented since both the first oil pump 130 and the second oil pump 150 discharge the hydraulic pressure during the set time H1 and the second set time H2.

4 and 5, a method for switching the mode from the second oil pump 150 to the first oil pump 130 will be described.

4 is a flowchart illustrating an oil pump control method for an automatic transmission according to another embodiment of the present invention.

Referring to FIG. 4, the controller 200 drives the second oil pump 150 through the motor 140 (S410). The controller 200 controls the engine 120 to drive the first oil pump 130 and operates the solenoid valve 170 to shut off the power of the first oil pump 130. That is, the controller 200 may simultaneously drive the first oil pump 130 and the second oil pump 150 as shown in FIG. 5 (a). And the controller 200 may operate the solenoid valve 170 as shown in FIG. 5 (b). At this time, the switch valve 160 connects the first flow path 50 and the recirculation flow path 70 by the solenoid valve 170 to return the hydraulic pressure discharged from the first oil pump 130 to the first oil pump 130 again. .

The controller 200 confirms the mode change based on the operation state information (S420).

The controller 200 stops the operation of the solenoid valve 170 when the mode change is confirmed (S430). That is, as shown in FIG. 5 (b), the controller 200 controls the solenoid valve 170 at the fifth time t5 when the third set time H3 has passed from the fourth time t4, Lt; / RTI > The switch valve 160 is connected to the first oil passage 50, the regulator valve 180 and the automatic transmission 190 so that the hydraulic pressure discharged from the first oil pump 130 can be supplied to the automatic transmission 190 .

The controller 200 stops the operation of the solenoid valve 170 and stops driving the second oil pump 150 (S440). That is, the controller 200 disengages the rotary shaft connecting the second oil pump 150 and the motor 140, stops the operation of the motor 140, and stops the operation of the second oil pump 150 .

5 (c), when the mode is switched from the second oil pump 150 to the first oil pump 130, the oil pump control apparatus 100 for the automatic transmission 190 changes the third It is possible to prevent a phenomenon in which the hydraulic pressure is insufficient since it overlaps during the set time H3.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Oil pump control device for automatic transmission
110: Oil tank
120: engine
130: first oil pump
140: motor
150: second oil pump
160: Switch valve
170: Solenoid valve
180: Regulator valve
190: Automatic transmission
200:

Claims (14)

A first oil pump driven by a drive force of the engine to suck the oil in the oil tank and discharge the oil pressure to the first oil path;
A second oil pump driven by the driving force of the motor to suck the oil in the oil tank and discharge the oil pressure to the second oil path;
A recirculation passage for supplying the hydraulic pressure discharged from the first oil pump to the first oil pump again;
A solenoid valve for controlling the switch valve to selectively supply the hydraulic pressure discharged from the first oil pump to the first flow path and the recirculation flow path; And
The first oil pump and the second oil pump are operated simultaneously during the set time of mode switching between the first oil pump and the second oil pump, and then the first oil pump is switched to the second oil pump or the second oil pump is switched to the first A controller for switching to an oil pump;
, ≪ / RTI &
The controller
An oil for an automatic transmission that drives the second oil pump to the first RPM when the mode is switched from the first oil pump to the second oil pump and drives the second oil pump to the second RPM after operating the solenoid valve, Pump control device. delete The method according to claim 1,
The controller
When the mode is switched from the first oil pump to the second oil pump, the second oil pump is driven to the first RPM at the first time point, and at the second point in time when the first set time elapses from the first point, And drives the second oil pump to the second PRM at a third time point at which the second set time has elapsed at the second time point. The method according to claim 1,
The controller
When the mode is switched from the first oil pump to the second oil pump, the oil temperature of the transmission and the driving RPM of the first oil pump are checked, the first RPM corresponding to the oil temperature and the driving RPM of the transmission is confirmed, And the second oil pump is driven at a predetermined speed. The method according to claim 1,
The controller
The solenoid valve is operated when the mode is switched from the second oil pump to the first oil pump, and the operation of the second oil pump is stopped after the third predetermined time has elapsed. The method according to claim 1,
And when the solenoid valve is operated under the control of the controller, the switch valve is connected to the recirculation passage to supply the oil pressure of the first oil pump again to the first oil pump. A method for controlling a first oil pump driven by a driving force of an engine and a second oil pump driven by a driving force of the motor,
Driving a first oil pump;
Driving the second oil pump to the first RPM by confirming the mode change according to the operation state information;
Operating a solenoid valve; And
Driving the second oil pump to a second PRM;
, ≪ / RTI &
The step of driving the second oil pump with the first RPM
Driving the second oil pump at a first time point with a first RPM,
The step of operating the solenoid valve
And operating the solenoid valve at a second time point at which the first set time has elapsed at the first time point. delete delete 8. The method of claim 7,
The step of driving the second oil pump with the second RPM
And driving the second oil pump with a second RPM at a third time point at which the second set time passes at the second time point. 8. The method of claim 7,
The step of driving the second oil pump with the first PRM
Confirming the oil temperature of the transmission and the driving RPM of the first oil pump;
Confirming the oil temperature of the transmission and the first RPM according to the drive PRM of the first oil pump; And
Driving the second oil pump at a speed of the first RPM;
And an oil pump for controlling the oil pump. 12. The method of claim 11,
The step of confirming the oil temperature of the transmission and the first RPM according to the drive PRM of the first oil pump
And detecting a first RPM matched to the oil temperature of the transmission and the drive RPM of the first oil pump in a preset drive control map. 8. The method of claim 7,
Driving the second oil pump in a state in which the first oil pump is driven;
Stopping the operation of the solenoid valve upon confirming all the switching operations according to the operation state information; And
Stopping the driving of the second oil pump;
Wherein the oil pump control method further comprises: 14. The method of claim 13,
The step of stopping the drive of the second oil pump
And stopping the operation of the second oil pump after the operation of the solenoid valve is stopped and the set time has elapsed.
KR1020150175295A 2015-12-09 2015-12-09 Apparatus for controlling oil pump of automatic transmission and method thereof KR101755484B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012082947A (en) 2010-10-12 2012-04-26 Hyundai Motor Co Ltd Oil supply system of transmission
JP2014047919A (en) 2012-09-03 2014-03-17 Hyundai Motor Company Co Ltd Hydraulic supply system of automatic transmission for vehicle
KR101703621B1 (en) 2015-08-25 2017-02-07 현대자동차 주식회사 Oil pressure supply system of automatic transmission

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012082947A (en) 2010-10-12 2012-04-26 Hyundai Motor Co Ltd Oil supply system of transmission
JP2014047919A (en) 2012-09-03 2014-03-17 Hyundai Motor Company Co Ltd Hydraulic supply system of automatic transmission for vehicle
KR101703621B1 (en) 2015-08-25 2017-02-07 현대자동차 주식회사 Oil pressure supply system of automatic transmission

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