KR101530429B1 - Preload control system of clutch for tod device - Google Patents

Preload control system of clutch for tod device Download PDF

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Publication number
KR101530429B1
KR101530429B1 KR1020130104428A KR20130104428A KR101530429B1 KR 101530429 B1 KR101530429 B1 KR 101530429B1 KR 1020130104428 A KR1020130104428 A KR 1020130104428A KR 20130104428 A KR20130104428 A KR 20130104428A KR 101530429 B1 KR101530429 B1 KR 101530429B1
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South Korea
Prior art keywords
clutch
step motor
controller
pressure value
piston
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KR1020130104428A
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Korean (ko)
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KR20150026077A (en
Inventor
방승우
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현대위아 주식회사
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Abstract

An embodiment of the present invention relates to a preload control system for a clutch for a TOD device, and a technical problem to be solved is to reduce power consumption by driving a step motor, prevent a decrease in durability of the motor, Thereby improving ride comfort.
To this end, one embodiment of the present invention is a preload control system for a clutch for a TOD device for controlling a preload of a clutch provided in a TOD device, comprising: a piston moved by hydraulic pressure generated by driving a motor pump; A plurality of clutch discs provided around an inner circumference of the clutch disc to be moved and contacted by the movement of the pistons, a plurality of clutch discs provided at the inner center thereof to support the plurality of clutch discs, A clutch; An elastic member provided to be compressed or expanded between a part of the piston and one side of the support shaft; A step motor portion that can be driven to move a part of the piston in the spring direction; A clutch pressure sensor unit for measuring a clutch pressure due to the movement of the piston; And a control unit for controlling the drive of the motor pump, the step motor unit, and the clutch pressure sensor unit, wherein the step motor of the step motor unit controls the clutch pressure value measured by the clutch pressure sensor unit during forward rotation or reverse rotation, And a controller for controlling whether or not the step motor unit is stopped.

Description

[0001] PRELOAD CONTROL SYSTEM OF CLUTCH FOR TOD DEVICE [0002]

One embodiment of the present invention relates to a preload control system of a clutch for a TOD device.

The TOD (Torque On Demand) device automatically distributes the torque to the front and rear wheels according to the running state of the four-wheel drive vehicle. Generally, such a TOD device always drives the pump motor for appropriate torque distribution and pre-pressure generation and maintenance of the clutch.

1 is a cross-sectional view schematically showing a conventional TOD device.

1, the TOD device according to the related art includes a piston 8 which is moved by the hydraulic pressure generated by the driving of the motor pump 2 and a piston 8 which is moved in the case 4 by the movement of the piston 8, A spring (7) provided to be compressed or expanded between the piston (8) and the support shaft (5) of the clutch (6), and a piston And a controller 9 for controlling the drive of the motor pump 2 and the clutch pressure sensor unit 3. The clutch pressure sensor unit 3 measures the clutch pressure caused by the movement of the clutch pressure sensor unit 3,

In the TOD apparatus according to the related art, the motor pump 2 always forms a pre-pressure, compresses the piston 8 to generate a pre-pressure, and always drives the motor pump 2 to maintain the pre-pressure. At this time, the preload is fixed and does not change. Therefore, in the conventional TOD device, the preload of the clutch 6 is specified at the time of designing so that the response time (clutch disconnection and engagement time) due to engagement and disengagement of the clutch 6 is fast, The larger the response speed at the time of driving, the faster the transmission of power, but the larger the amount of the impact, the lower the ride quality. Further, in the conventional TOD device, the durability of the motor pump 2 is lowered by continuously driving the motor pump 2 for pressure generation and maintenance, and power consumption due to continuous driving of the motor pump 2 is generated There was a problem.

Japanese Patent Application Laid-Open No. 10-2007-0036883 'Preload Compensation Device for Transmission' Registration No. 10-0864568 entitled " Torque-on-demand device for four-wheel drive vehicle "

An embodiment of the present invention provides a preload control system for a clutch for a TOD device that can reduce power consumption by driving a stepper motor, prevent durability of the motor from being deteriorated, prolong its service life, and improve ride quality.

The preload control system of the clutch for the TOD device according to the embodiment of the present invention is a preload control system for the clutch for the TOD device for controlling the preload of the clutch provided in the TOD device, A hydraulically moved piston; A plurality of clutch discs provided around an inner circumference of the clutch disc to be moved and contacted by the movement of the pistons, a plurality of clutch discs provided at the inner center thereof to support the plurality of clutch discs, A clutch; An elastic member provided to be compressed or expanded between a part of the piston and one side of the support shaft; A step motor portion that can be driven to move a part of the piston in the spring direction; A clutch pressure sensor unit for measuring a clutch pressure due to the movement of the piston; And a control unit for controlling the drive of the motor pump, the step motor unit, and the clutch pressure sensor unit, wherein the step motor of the step motor unit controls the clutch pressure value measured by the clutch pressure sensor unit during forward rotation or reverse rotation, And a controller for controlling whether the step motor unit is stopped or not.

The reference clutch pressure value may include a reference clutch maximum pressure value and a reference clutch minimum pressure value.

Wherein the step motor unit includes a step motor that rotates stepwise at a predetermined angle; A protrusion formed on one end of the step motor and protruding in the direction of the elastic member, the protrusion being rotated by driving the step motor; And a pressing portion provided at an end of the projection member and moved toward the elastic member by rotation of the projection member to press the elastic member.

The outer surface of the projection member may have a screw shape.

And a pressing body portion having a through hole between the step motor and the pressing portion. The inner wall of the through hole may have a screw shape corresponding to the outer surface of the protrusion member.

The elastic member may have a unique preload for the clutch.

The elastic member may be a spring.

The clutch may be a wet clutch.

The controller can determine that the pre-press of the clutch is necessary when the vehicle is in the four-wheel drive state.

The controller can measure the wheel slip amount by the following equation (1).

[Equation 1]

? N = (FL + FR) / 2 - (RL + RR) / 2

Here,? N is the wheel slip amount, FL is the front wheel left wheel speed, FR is the front wheel right wheel speed, RL is the rear wheel left wheel speed, and RR is the front right wheel speed.

The controller may determine the rotational direction of the step motor by comparing the measured wheel slip amount with a preset reference wheel slip amount.

The controller may cause the step motor to rotate forward when the measured wheel slip amount is greater than a preset reference wheel slip amount.

The controller can stop driving the step motor when the step motor is rotated forward and the clutch pressure value measured by the clutch pressure sensor unit is greater than a preset reference clutch maximum pressure value.

The controller may reverse the step motor when the measured wheel slip amount is smaller than a preset reference wheel slip amount.

The controller can stop driving the step motor when the clutch pressure measured by the clutch pressure sensor is greater than a predetermined reference clutch minimum pressure value when the step motor is reversely rotated.

The controller can determine that the pre-pressure of the clutch is unnecessary when the vehicle is driven by two-wheel drive.

The controller can make the step motor rotate forward when the position of the step motor is at a position lower than the position of the step motor which does not require preloading of the clutch.

The controller can reverse the step motor when the position of the step motor is at a position higher than the position of the step motor where the pre-press of the clutch is unnecessary.

The preload control system of the clutch for the TOD apparatus according to the embodiment of the present invention is advantageous in that the durability of the motor pump is higher than that of the conventional clutch that continuously drives the motor pump for generating and maintaining the clutch pressure The ride comfort is improved through the adjustment of the preload, and the continuous power consumption of the motor pump can be prevented.

1 is a cross-sectional view schematically showing a conventional TOD device.
2 is a block diagram schematically showing a preload control system of a clutch for an TOD device according to an embodiment of the present invention.
3 is a flowchart showing an example of the operation of the preload control system of the clutch for the TOD apparatus of Fig.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which those skilled in the art can readily implement the present invention.

FIG. 2 is a block diagram schematically showing a preload control system of a clutch for an TOD device according to an embodiment of the present invention, and FIG. 3 shows an example of the operation of the preload control system of the clutch for the TOD device of FIG. It is a flowchart.

Referring to FIG. 2, the preload control system of the clutch for the TOD apparatus according to the embodiment of the present invention is a system for controlling the preload of the clutch provided in the TOD apparatus, A plurality of clutch discs 71 provided at the inner center of the clutch discs 71 and disposed on the inner periphery of the clutch discs 71 to move in contact with the pistons 90 by movement of the pistons 90, And a support shaft 60 disposed on one side of the piston 90 so as to face a partial area of the piston 90. The clutch 70 is disposed between a part of the piston 90 and one side of the support shaft 60 A step motor S which can be driven to move a part of the piston 90 in the spring direction and a clutch C that is driven by the movement of the piston 90 70) Clutch pressure sensor to measure pressure The step motor section S is controlled by the step motor section S to rotate in the forward or reverse direction And a controller 100 for comparing the clutch pressure value measured by the clutch pressure sensor unit 40 with a preset reference clutch pressure value to control whether the step motor S is stopped. Here, the reference clutch pressure value may include a reference clutch maximum pressure value and a reference clutch minimum pressure value.

The step motor S includes a step motor 20 which is stepwise rotated at a predetermined angle and a step motor 20 which is formed at one end of the step motor 20 and which is protruded in the direction of the elastic member 80, A pressing portion 22 provided at the end of the projection member 21 and moved in the direction of the elastic member 80 by the rotation of the projection member 21 to press the elastic member 80, . ≪ / RTI >

The outer surface of the projection member 21 may have a screw shape.

Between the step motor 20 and the pressing portion 22, a pressing body 10 having a through hole 11 may be provided. In the inner wall of the through hole 11, a screw-shaped projection may be formed so as to correspond to the outer surface of the projection member 21.

The elastic member 80 may have a unique preload for the clutch 70. The elastic member 80 may be a spring.

In addition, although the clutch 70 may be a wet clutch, the clutch 70 is not limited in the present invention.

The controller 100 is connected to the motor pump 30, the step motor unit S and the clutch pressure sensor unit 40 and is connected to the motor pump 30, the step motor unit S and the clutch pressure sensor unit 40, Can be controlled.

Hereinafter, the operation of the preload control system of the clutch for the TOD apparatus will be described with reference to FIGS. 2 and 3. FIG.

First, the controller 100 determines whether the vehicle is in a four-wheel drive state or a two-wheel drive state (S10), and drives the system according to each control mode.

The controller 100 can determine that the preload of the clutch 70 is necessary when the vehicle is in the four-wheel drive (4WD) state.

The controller 100 may measure the wheel slip amount according to Equation (1) (S20).

[Equation 1]

? N = (FL + FR) / 2 - (RL + RR) / 2

Here,? N is the wheel slip amount, FL is the front wheel left wheel speed, FR is the front wheel right wheel speed, RL is the rear wheel left wheel speed, and RR is the front right wheel speed.

The controller 100 can adjust the amount of preload by driving the step motor 20 and fixing the position of the piston 90 after measuring the slip amount. Accordingly, in the present invention, it is unnecessary to always drive the motor pump 30, thereby reducing power consumption.

The controller 100 may determine the rotational direction of the step motor 20 by comparing the measured wheel slip amount with a preset reference wheel slip amount (S30). That is, when the slip amount is large, the preload amount increases and the step motor 20 rotates forward (S40). When the slip amount is small, the preload amount decreases and the step motor 20 rotates backward (S31).

The controller 100 may cause the step motor 20 to rotate forward (S40) when the measured wheel slip amount is greater than a preset reference wheel slip amount (DELTA N_Ref). When the step motor 20 is rotated forward and the clutch pressure value P_meas measured by the clutch pressure sensor 40 is greater than a preset reference clutch maximum pressure value P_preMax The driving of the step motor 20 can be stopped (S60). The reference clutch maximum pressure value (P_preMax) is a clutch required preload maximum pressure value, which corresponds to the product pre-determined value through the test evaluation.

The controller 100 can reverse the step motor 20 (S31) when the measured wheel slip amount is smaller than a preset reference wheel slip amount (DELTA N_Ref). When the step motor 20 is reversely rotated, the controller 100 determines whether the clutch pressure value P_meas measured by the clutch pressure sensor 40 is greater than a preset reference clutch minimum pressure value P_preMin (S32 The driving of the step motor 20 can be stopped (S60). The reference clutch minimum pressure value (P_preMin) is a clutch required preload minimum pressure value, and corresponds to a product pre-determined value through a test evaluation.

The controller 100 can determine that the preload of the clutch 70 is unnecessary when the vehicle is two-wheel drive (2WD). At this time, when the position of the step motor 20 is lower than the position (Motor Position (x)) of the step motor 20 in which the pre-pressure of the clutch 70 is unnecessary (S11, 12) The motor 20 can be rotated forward (S13). When the position of the step motor 20 is higher than the position of the step motor 20 where the preload of the clutch 70 is unnecessary (S11, 12), the controller 100 controls the step motor 20 to rotate in the reverse direction (S14).

Meanwhile, the control mode 0 in FIG. 3 means full open, that is, Fully Opend (2WD), and the control mode 1 means the 4WD ready state in which the preload is required.

According to the preload control system of the clutch for the TOD apparatus according to the embodiment of the present invention configured as described above, the motor pump 30 is continuously driven to generate and maintain the clutch pressure by driving the step motor 20 once The durability of the motor pump 30 is lowered and the riding comfort is improved through the adjustment of the preload amount and the continuous power consumption of the motor pump 30 can be prevented.

It is to be understood that the present invention is not limited to the above-described embodiment, and that various modifications, additions, and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: Pressurizing body part 20: Step motor
30: motor pump 40: clutch pressure sensor part
50: housing 60: support shaft
70: clutch 80: elastic member
90: Piston 100: Controller

Claims (18)

A preload control system for a clutch for a TOD apparatus for controlling a preload of a clutch provided in a TOD apparatus,
A piston which is moved by the hydraulic pressure generated by driving the motor pump;
A plurality of clutch discs provided around an inner circumference of the clutch disc to be moved and contacted by the movement of the pistons, a plurality of clutch discs provided at the inner center thereof to support the plurality of clutch discs, A clutch;
An elastic member provided to be compressed or expanded between a part of the piston and one side of the support shaft;
A step motor portion that can be driven to move a part of the piston in the direction of the elastic member;
A clutch pressure sensor unit for measuring a clutch pressure due to the movement of the piston; And
Wherein the control unit controls the drive of the motor pump, the step motor unit, and the clutch pressure sensor unit, wherein the step motor of the step motor unit controls the clutch pressure value measured by the clutch pressure sensor unit and the preset reference clutch pressure value And a controller for controlling whether or not the step motor unit is stopped,
The step motor unit
A stepping motor rotating stepwise at a constant angle;
A protrusion formed on one end of the step motor and protruding in the direction of the elastic member, the protrusion being rotated by driving the step motor; And
And a pressing portion provided at an end of the protrusion member and moved toward the elastic member by rotation of the protrusion member to press the elastic member. The method according to claim 1,
Wherein the reference clutch pressure value includes a reference clutch maximum pressure value and a reference clutch minimum pressure value. delete The method according to claim 1,
And the outer surface of the protruding member has a screw shape. 5. The method of claim 4,
Further comprising a pressing body portion having a through hole formed between the step motor and the pressing portion,
And the inner wall of the through hole has a screw shape corresponding to the outer surface of the protrusion member. The method according to claim 1,
Characterized in that the elastic member has a unique preload for the clutch. The method according to claim 1,
Wherein the elastic member is a spring. ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Characterized in that the clutch can be a wet clutch. 3. The method of claim 2,
Wherein the controller determines that a pre-pressure of the clutch is required when the vehicle is in a four-wheel drive state. 10. The method of claim 9,
Wherein the controller measures a wheel slip amount according to Equation (1) below.
[Equation 1]
? N = (FL + FR) / 2 - (RL + RR) / 2
Here,? N is the wheel slip amount, FL is the front wheel left wheel speed, FR is the front wheel right wheel speed, RL is the rear wheel left wheel speed, and RR is the front right wheel speed. 11. The method of claim 10,
Wherein the controller determines the rotational direction of the step motor by comparing the measured wheel slip amount with a preset reference wheel slip amount. 12. The method of claim 11,
Wherein the controller causes the step motor to rotate forward when the measured wheel slip amount is greater than a preset reference wheel slip amount. 13. The method of claim 12,
Wherein the controller stops driving of the step motor when the clutch pressure value measured by the clutch pressure sensor unit is greater than a predetermined reference clutch maximum pressure value when the step motor is rotated forward. Clutch preload control system. 12. The method of claim 11,
Wherein the controller rotates the step motor in the reverse direction when the measured wheel slip amount is smaller than a preset reference wheel slip amount. 15. The method of claim 14,
Wherein the controller stops driving the step motor when the clutch pressure value measured by the clutch pressure sensor unit is greater than a preset reference clutch minimum pressure value when the step motor is reversely rotated. Clutch preload control system. 3. The method of claim 2,
Wherein the controller determines that a pre-pressure of the clutch is unnecessary when the vehicle is driven by two-wheel drive. 17. The method of claim 16,
Wherein the controller causes the step motor to rotate forward when the position of the step motor is at a position lower than the position of the step motor where the pre-pressure of the clutch is unnecessary. 17. The method of claim 16,
Wherein the controller rotates the step motor in the reverse direction when the position of the step motor is at a position higher than the position of the step motor where the pre-pressure of the clutch is unnecessary.
KR1020130104428A 2013-08-30 2013-08-30 Preload control system of clutch for tod device KR101530429B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101737733B1 (en) 2016-05-31 2017-05-29 현대위아 주식회사 Control method of torque transmiting apparatus for four wheel drive vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960027239A (en) * 1994-12-23 1996-07-22 이형도 Bidirectional step motor
JP2008232368A (en) * 2007-03-23 2008-10-02 Univance Corp Driving force distributing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960027239A (en) * 1994-12-23 1996-07-22 이형도 Bidirectional step motor
JP2008232368A (en) * 2007-03-23 2008-10-02 Univance Corp Driving force distributing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101737733B1 (en) 2016-05-31 2017-05-29 현대위아 주식회사 Control method of torque transmiting apparatus for four wheel drive vehicle

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