KR101612268B1 - Apparatus drag torque of elctro-machanical brake and method thereof - Google Patents

Apparatus drag torque of elctro-machanical brake and method thereof Download PDF

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KR101612268B1
KR101612268B1 KR1020100081591A KR20100081591A KR101612268B1 KR 101612268 B1 KR101612268 B1 KR 101612268B1 KR 1020100081591 A KR1020100081591 A KR 1020100081591A KR 20100081591 A KR20100081591 A KR 20100081591A KR 101612268 B1 KR101612268 B1 KR 101612268B1
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turned
pad
accelerator pedal
initial value
gap
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KR1020100081591A
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Korean (ko)
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KR20120018629A (en
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김종성
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현대모비스 주식회사
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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adjusting a drag torque of an electric braking device capable of reducing a drag torque by adjusting a gap between disk pads and adjusting a gap between a pad and a disk depending on whether an accelerator pedal is turned on .

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for adjusting drag torque of an electric brake apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric brake apparatus, and more particularly, to an apparatus and method for adjusting a drag torque of an electric brake apparatus which can reduce a drag torque by adjusting a gap between disc pads.

The ELCTRO-MACHANICAL BRAKE (EMB), instead of the hydraulic brake system applied to the vehicle, converts the force that the driver stepped on the brake pedal into an electrical signal and brakes it. When the driver depresses the pedal, the simulator attached to the pedal changes it into an electrical signal and transmits it to the ECU. The ECU controls the electric calipers by calculating the vehicle condition and braking force.

This electric braking device does not need time to transmit the hydraulic pressure and can control the braking force of the vehicle optimally so that the braking distance is relatively short so that the safety of the driver is further improved and the brake pedal is very easy to use due to electronic braking, No noise is generated at all.

In addition, excellent braking power on ice roads and steep curve roads, so that the driver does not feel tilted or tilted very much, the driver's ride comfort is further improved.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

In the conventional electric braking device, when the ECU, which has received the electronic pedal information, generates an axial movement force by driving the motor, the piston is moved in the axial direction through the speed reducer coupled to the motor, do.

However, drag torque due to contact between the disk and the pad is generated in the electric brake apparatus, as in the conventional braking apparatus, due to its operating characteristics.

The drag torque is generated by the contact between the disc and the pad, and is a force acting in a direction opposite to the rotational force generated by frictional resistance between the disc pads. This drag torque causes frictional heat generation, power loss, and fuel consumption deterioration.

Accordingly, the gap between the disc and the pad must be increased to reduce the drag torque. However, since the gap between the disc and the pad must be kept large, the responsiveness is reduced when the vehicle is suddenly braked.

Disclosure of the Invention The present invention has been devised to overcome the above-mentioned problems, and it is an object of the present invention to provide a brake system capable of adjusting a gap between a pad and a disc according to whether an accelerator pedal and a brake pedal are turned on or off in an electric brake apparatus, And an object of the present invention is to provide an apparatus and method for adjusting the drag torque of an electric brake apparatus.

A method of adjusting a drag torque of an electric braking device according to an aspect of the present invention includes: determining whether an accelerator pedal is turned on; And adjusting the gap between the pad and the disk by driving the actuator according to whether the accelerator pedal is turned on or not.

In the present invention, the step of adjusting the clearance between the pad and the disk may increase the clearance between the pad and the disk to a value greater than an initial value when the accelerator pedal is turned on.

In the present invention, the step of adjusting the clearance between the pad and the disc is adjusted to an initial value as a gap between the pad and the disc when the accelerator pedal is turned off.

According to another aspect of the present invention, there is provided a method of adjusting a drag torque of an electric brake apparatus, the method comprising: determining whether an accelerator pedal and a brake pedal are turned on; And adjusting a gap between the pad and the disc depending on whether the accelerator pedal and the brake pedal are turned on.

In the present invention, the step of adjusting the clearance between the pad and the disk may include adjusting the clearance between the pad and the disk by turning on the accelerator pedal and turning off the brake pedal, Is increased to be larger than the initial value.

In the present invention, the step of adjusting the clearance between the pad and the disk may be performed by adjusting the gap between the pad and the disk to an initial value when the accelerator pedal is turned on and the brake pedal is turned on.

In the present invention, the step of adjusting the clearance between the pad and the disk may be such that the gap between the pad and the disk is adjusted to an initial value when the acceleration pedal is turned off and the brake pedal is turned off.

According to an aspect of the present invention, there is provided an apparatus for adjusting a drag torque of an electric braking apparatus, including: an actuator unit generating a rotational force; A pressing portion for pushing or retracting the pad toward the disc through the rotational force generated by the actuator portion; And an ECU for adjusting the gap between the pad and the disk by controlling the actuator according to whether the accelerator pedal is turned on or not.

The ECU of the present invention is characterized in that, when the accelerator pedal is turned on, the gap between the pad and the disk is increased to be larger than an initial value.

The ECU of the present invention adjusts the gap between the pad and the disk to an initial value when the accelerator pedal is turned off.

According to another aspect of the present invention, there is provided an apparatus for adjusting a drag torque of an electric braking apparatus, including: an actuator unit generating a rotational force; A pressing portion for pushing or retracting the pad toward the disc through the rotational force generated by the actuator portion; And an ECU for adjusting the gap between the pad and the disc by controlling the actuator according to whether the accelerator pedal and the brake pedal are turned on.

The ECU of the present invention is characterized in that when the accelerator pedal is turned on and the brake pedal is turned off, the gap between the pad and the disk is increased larger than the initial value.

In the ECU of the present invention, when the accelerator pedal is turned on and the brake pedal is turned on, the gap between the pad and the disk is adjusted to an initial value.

The ECU of the present invention adjusts the gap between the pad and the disk to an initial value when the accelerator pedal is turned off and the brake pedal is turned off.

According to the present invention, the gap between the pad and the disk can be adjusted according to whether the accelerator pedal and the brake pedal are turned on or off in the electric brake apparatus, so that the drag torque can be reduced without lowering the responsiveness upon braking.

1 is a block diagram of an apparatus for adjusting a drag torque of an electric braking apparatus according to an embodiment of the present invention.
2 is a flowchart of a drag torque adjusting method of the electric braking device according to the first embodiment of the present invention.
3 is a flowchart of a method of adjusting the drag torque of the electric braking device according to the second embodiment of the present invention.

Hereinafter, an apparatus and method for adjusting a drag torque of an electric braking apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, terms to be described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram of an apparatus for adjusting a drag torque of an electric braking apparatus according to an embodiment of the present invention.

1, an apparatus for adjusting the drag torque of an electric braking apparatus according to an embodiment of the present invention includes an ECU 10, an actuator unit 20, and a pressing unit 30. As shown in Fig.

The actuator unit 20 generates a rotational force in accordance with a control signal from the ECU 10 and includes a motor (not shown) and a speed reducer (not shown).

The motor is driven in accordance with the control signal of the ECU 10 to generate torque, and the speed reducer reduces the number of revolutions of the motor to generate a large output torque. Normally, the reducer is composed of various gears, and the final output torque is determined according to the design specification.

The pressing portion 30 moves the pad 40 in the direction of the disk D through the rotational force generated by the actuator portion 20 to apply a restraining force.

The pressurizing portion 30 has a screw shaft (not shown) rotated by the rotational force of the speed reducer and a piston (not shown) pushing or retracting the pad 40 by the rotational direction of the screw shaft.

The ECU 10 drives the actuator unit 20 according to various signals input from the outside, for example, an accelerator pedal signal, a braking pedal signal, a vehicle start signal or the like.

In particular, the ECU 10 variably adjusts a gap (hereinafter, simply referred to as an air gap) between the pad 40 and the disk D depending on whether the accelerator pedal and the brake pedal are turned on or off.

In this case, when the accelerator pedal is turned on, the air gap is adjusted to a set value larger than the initial value to reduce the drag torque, and when the accelerator pedal is turned off or the brake pedal is turned on, the vehicle can be braked.

This will be described in detail with reference to FIG. 2 and FIG.

2 is a flowchart of a drag torque adjusting method of the electric braking device according to the first embodiment of the present invention.

A method of adjusting the drag torque of the electric braking device according to the first embodiment of the present invention is as follows.

First, the ECU 10 determines whether the vehicle is turned on (S100).

As a result of the determination, when the vehicle is turned on, the air gap is adjusted to a predetermined initial value by controlling the actuator unit 20 (S102).

After adjusting the air gap to the initial value through the actuator unit 20, it is determined whether the accelerator pedal is in the ON state (S104).

As a result of the determination, if the accelerator pedal is on, it is determined whether the air gap is equal to or less than the initial value (S106). If the air gap is less than the initial value, the air gap is adjusted to the set value.

Here, the set value is larger than the initial value. Therefore, since the air gap is larger than the state in which the accelerator pedal is turned on, the drag torque can be reduced.

On the other hand, if it is determined in step S104 that the accelerator pedal is turned on, if the accelerator pedal is turned off, it is determined whether the air gap is equal to or less than the initial value (S110).

As a result of the determination, if the air gap exceeds the initial value, the air gap is adjusted to the initial value (S112).

In this case, if the air gap is larger than the initial value, the air gap is adjusted to the initial value. If the accelerator pedal is turned off, the air gap can be brought into the braking state. do.

The reason why the air gap is adjusted to the initial value when the air gap exceeds the initial value in the state that the accelerator pedal is turned off is because the air gap is large in a state where the air gap is adjusted to a setting value larger than the initial value , And the response may be degraded when sudden sudden braking.

On the other hand, after the air gap is adjusted to the initial value, it is determined whether the vehicle is turned on (S114). If the vehicle is turned on, the above steps (S104 to S114) are repeated.

The drag torque adjusting method of the electric braking device according to the first embodiment of the present invention is a case in which the accelerator pedal and the braking pedal are operated separately.

However, depending on the driver, the accelerator pedal and the brake pedal may be operated at the same time. Fig. 3 is for this case, and a drag torque adjusting method of the electric braking device when the accelerator pedal and the brake pedal are operated at the same time will be described with reference to Fig.

3 is a flowchart of a method of adjusting the drag torque of the electric braking device according to the second embodiment of the present invention.

The method of adjusting the drag torque of the electric braking device according to the second embodiment of the present invention further includes the case where the accelerator pedal and the braking pedal are simultaneously turned on in the first embodiment. Therefore, the case where the accelerator pedal and the brake pedal are operated separately is the same as the first embodiment described above, and therefore, will be briefly described.

First, when the vehicle is turned on (S200), the ECU 10 adjusts the air gap to an initial value (S202).

After the air gap is adjusted to the initial value, it is determined whether the accelerator pedal is turned on (S204). If the accelerator pedal is turned on, it is determined whether the brake pedal is turned on (S206).

As a result of the determination, if the brake pedal is turned on, it is determined that the air gap is equal to or less than the initial value by setting the priority of the brake pedal to the brake pedal (step S208). If the air gap exceeds the initial value, The gap is adjusted to an initial value (S210).

Thus, if the brake pedal is turned on even if the accelerator pedal is turned on, the driver is in a state of being able to brake. In this case, priority is given to the brake pedal to adjust the air gap to an initial value so as not to lower the responsiveness to braking .

Thereafter, the start-up state of the vehicle is determined (S220). If the start-up of the vehicle is on, steps after the above-described step S204 are performed.

On the other hand, if the accelerator pedal is turned on and the brake pedal is turned off, only the accelerator pedal is in the on state. If the air gap is less than the initial value, the air gap is adjusted to the set value (S212, S214).

On the other hand, if the accelerator pedal is turned off, it is determined whether the air gap is less than the initial value, and if the air gap exceeds the initial value, the air gap is adjusted to the initial value (S216, S218).

The reason why the air gap is adjusted to the initial value in a state where the accelerator pedal is turned off is that since the air gap is large when the air gap is adjusted to a setting value larger than the initial value, Because. This is the same as the first embodiment described above.

As described above, the method for adjusting the drag torque of the electric braking device according to the embodiment of the present invention adjusts the air gap according to whether or not the accelerator pedal is turned on. That is, when the accelerator pedal is turned off, the air gap is adjusted to an initial value, and when the accelerator pedal is turned on, the air gap is adjusted to a set value larger than the initial value, thereby reducing the drag torque .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: ECU 20: actuator section
30: pressing portion 40: pad
D: disk

Claims (14)

delete delete delete Determining whether an accelerator pedal and a brake pedal are turned on by the ECU ; And
Controlling the actuator unit to adjust the gap between the pad and the disc by pushing or retracting the pad toward the disc through the pressing unit depending on whether the accelerator pedal and the brake pedal are turned on,
When the accelerator pedal is turned on and the braking pedal is turned off, the gap between the pad and the disk is increased to be larger than the initial value,
When the accelerator pedal is turned on and the brake pedal is turned on, the gap between the pad and the disk is adjusted to an initial value
Wherein the gap between the pad and the disk is adjusted to an initial value when the accelerator pedal is turned off and the brake pedal is turned off . delete delete delete delete delete delete An actuator for generating a rotational force;
A pressing portion for pushing or retracting the pad toward the disc through the rotational force generated by the actuator portion; And
And an ECU for adjusting the gap between the pad and the disk by controlling the actuator according to whether the accelerator pedal and the brake pedal are turned on,
The ECU increases the gap between the pad and the disk to a value larger than the initial value when the accelerator pedal is turned on and the brake pedal is turned off,
The ECU adjusts the gap between the pad and the disk to an initial value when the accelerator pedal is turned on and the brake pedal is turned on,
Wherein the ECU adjusts the gap between the pad and the disk to an initial value when the accelerator pedal is turned off and the brake pedal is turned off .
delete delete delete
KR1020100081591A 2010-08-23 2010-08-23 Apparatus drag torque of elctro-machanical brake and method thereof KR101612268B1 (en)

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KR1020100081591A KR101612268B1 (en) 2010-08-23 2010-08-23 Apparatus drag torque of elctro-machanical brake and method thereof

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KR1020100081591A KR101612268B1 (en) 2010-08-23 2010-08-23 Apparatus drag torque of elctro-machanical brake and method thereof

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KR101612268B1 true KR101612268B1 (en) 2016-04-14

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150012206A (en) 2013-07-24 2015-02-03 한국전자통신연구원 Method and apparatus for encoding three dimensoional content
KR101510419B1 (en) * 2013-08-08 2015-04-14 주식회사 만도 Device for reduction of brake drag using electronic stability control system and method for reduction thereof
KR102352412B1 (en) * 2015-07-13 2022-01-18 현대모비스 주식회사 Apparatus and method of air-gap adjustment for electro-mechanical brake system
CN113928285B (en) * 2021-09-30 2022-09-16 浙江吉利控股集团有限公司 Method for reducing drag torque of brake

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000283198A (en) * 1999-03-31 2000-10-13 Tokico Ltd Electric brake device
JP2002213508A (en) * 2001-01-24 2002-07-31 Akebono Brake Ind Co Ltd Method and device for controlling electric brake device
JP2002347598A (en) * 2001-05-29 2002-12-04 Nissan Motor Co Ltd Anti-skid controller
JP4333190B2 (en) * 2003-04-10 2009-09-16 株式会社アドヴィックス Braking device for vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000283198A (en) * 1999-03-31 2000-10-13 Tokico Ltd Electric brake device
JP2002213508A (en) * 2001-01-24 2002-07-31 Akebono Brake Ind Co Ltd Method and device for controlling electric brake device
JP2002347598A (en) * 2001-05-29 2002-12-04 Nissan Motor Co Ltd Anti-skid controller
JP4333190B2 (en) * 2003-04-10 2009-09-16 株式会社アドヴィックス Braking device for vehicle

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