KR20160086578A - Brake system in a vehicle - Google Patents

Brake system in a vehicle Download PDF

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Publication number
KR20160086578A
KR20160086578A KR1020150004068A KR20150004068A KR20160086578A KR 20160086578 A KR20160086578 A KR 20160086578A KR 1020150004068 A KR1020150004068 A KR 1020150004068A KR 20150004068 A KR20150004068 A KR 20150004068A KR 20160086578 A KR20160086578 A KR 20160086578A
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KR
South Korea
Prior art keywords
vehicle
pressure
front wheel
braking
unit
Prior art date
Application number
KR1020150004068A
Other languages
Korean (ko)
Inventor
류성연
Original Assignee
주식회사 만도
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Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020150004068A priority Critical patent/KR20160086578A/en
Publication of KR20160086578A publication Critical patent/KR20160086578A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1763—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to the coefficient of friction between the wheels and the ground surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

The present invention relates to a brake control system for a vehicle, comprising a wheel braking pressure measuring unit for measuring braking pressures of front and rear wheels of a vehicle, a master cylinder pressure measuring unit for measuring a master cylinder pressure of the vehicle, And a control unit for executing anti-lock brake control after linearly increasing the front wheel braking pressure of the vehicle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake system for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake system of a vehicle and a control method thereof, and more particularly to a control device relating to an anti-lock brake system (ABS).

The vehicle is essentially equipped with a brake system for braking. Recently, various types of systems have been proposed to obtain a more powerful and stable braking force. Examples of the brake system include an anti-lock brake system that prevents slippage of the wheel during braking and a brake traction control system (BTCS: Brake Traction Control) that prevents slippage of the drive wheel during sudden acceleration or sudden acceleration of the vehicle. (Vehicle Dynamic Control System) that stabilizes the running condition of the vehicle by controlling brake hydraulic pressure by combining anti-lock brake system and traction control.

Generally, the conventional ABS is provided to brake the vehicle by repeatedly locking or unlocking the wheels of the vehicle at the time of quick braking. However, there is a problem that when the vehicle suddenly brakes, the rear wheel of the vehicle is heard to provide an unstable ride feeling.

Particularly, in the conventional ABS, when the vehicle body such as an SUV is high, the rear wheel lifting due to the pitching motion is more serious, so that an appropriate braking distance can not be secured and the stability of the vehicle is deteriorated.

Therefore, recently, an improved ABS control device and its control method that can improve the safety of the vehicle by preventing the rear wheel lifting phenomenon of the vehicle while optimizing the braking distance at the time of rapid braking have been continuously studied.

Embodiments of the present invention are directed to solving the above problems, and one aspect of the present invention is to optimize the braking distance while maintaining the optimization slip range.

Another object of the present invention is to provide an ABS control apparatus capable of more efficiently improving the stability of a vehicle while optimizing the braking distance more efficiently.

According to an embodiment of the present invention, there is provided a vehicle braking system including a wheel braking pressure measuring unit for measuring braking pressures of front and rear wheels of a vehicle, a master cylinder pressure measuring unit for measuring a master cylinder pressure of the vehicle, And a controller for executing anti-lock brake control after linearly increasing the front wheel braking pressure of the vehicle if the change in the master cylinder pressure is larger than a reference value.

The controller may further include a road surface friction estimating unit that estimates a road surface friction coefficient of a road in which the vehicle is running, and the control unit controls the front wheel braking pressure to a first reference pressure when the estimated road surface friction coefficient is greater than a threshold value And the front wheel braking pressure can be linearly increased to the second reference pressure when the front wheel braking pressure reaches the first reference pressure.

Further, the anti-lock brake control of the vehicle can be executed when the front wheel braking pressure reaches the second reference pressure.

The control unit may set the braking pressure pattern of the outer front wheel and the inner front wheel differently when the turning of the vehicle is detected by the turning detection unit.

The embodiments of the present invention are directed to an ABS control apparatus and a control method for a vehicle that prevent deep slip of a wheel due to pitching motion of the vehicle through appropriate wheel pressure control of the front wheel of the vehicle, The braking distance can be optimized by maximizing the grounding area of the front wheels and the rear wheels of the vehicle.

In addition, when the vehicle is suddenly stopped, the rear wheels of the vehicle are prevented from being lifted, thereby improving the safety of the vehicle.

Further, the brake control system according to the embodiments of the present invention has another effect that the stability of the vehicle can be improved more efficiently while the braking distance is more efficiently optimized by forcibly reducing the front wheel braking pressure.

1 is a block diagram of a brake control system for a vehicle according to the present invention.
2 is a graph showing an embodiment of a conventional vehicle brake control.
3 is a graph showing an embodiment of a vehicle brake control according to the present invention.
4 is a graph showing another embodiment of the vehicle brake control according to the present invention.
5 is a graph showing an embodiment of vehicle braking control when the vehicle is turning in accordance with the present invention.
6 is a flowchart of brake control of a vehicle according to the present invention.
7 is a flow chart according to another embodiment of brake control of a vehicle according to the present invention.
8 is a flowchart according to another embodiment of brake control of a vehicle according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs. The present invention is not limited to the embodiments shown herein but may be embodied in other forms. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 is a block diagram of a brake control system 1 of a vehicle according to the present invention.

1, a vehicle brake control system 1 according to the present invention includes a wheel speed measuring unit 10, a wheel braking pressure measuring unit 20, a master cylinder pressure measuring unit 30, a turn sensing unit 40 A road surface friction estimation unit 41, a control unit 50, and an ABS driving unit 60. [

The wheel speed measuring unit 10 can detect the rotational speed of the vehicle wheel from the wheel speed sensors respectively provided on the wheels of the vehicle 2 according to the present invention and send a detection signal to the control unit 50. [ The control unit 50 can measure the speed of the vehicle through the detection signal detected by the wheel speed measuring unit 10. [

For example, the wheel speed sensors are located on each wheel of the vehicle. In other words, the wheel speed sensor may be provided on the left front wheel FL, the right front wheel FR, the left rear wheel RL, and the right rear wheel RR of the vehicle 2, respectively.

The wheel braking pressure measuring unit 20 can measure the brake hydraulic pressure in the wheel brake cylinder. In order to measure this, it is also possible to use the pressure value of the brake hydraulic pressure or the estimated value through the master cylinder pressure measuring part.

For example, the pressure sensors are located on each wheel of the vehicle. In other words, the brake hydraulic pressure measuring sensor may be provided on the left front wheel FL, the right front wheel FR, the left rear wheel RL, and the right rear wheel RR of the vehicle 2, respectively. In the case of a non-system, the master cylinder pressure is used to estimate the pressure of each wheel.

The master cylinder pressure measuring section 30 measures the pressure change in the master cylinder. That is, the pressure generated in the master cylinder during braking is detected and sent to the controller 50.

Two master cylinder pressure sensors 3 for measuring the master cylinder pressure may be installed at the lower end of the master cylinder (not shown). At this time, the control unit 50 can sense the driver's braking intent through the pressure of the changing master cylinder.

The turning detection unit 40 detects whether the vehicle is turning to the right or to the left. For this purpose, the turning detection unit 40 can detect turning or turning using the difference between the steering wheel and the left and right wheel speeds of the vehicle.

The road surface friction estimation unit 41 estimates the degree of friction of the road surface in which the vehicle is running. That is, the road surface friction estimation unit 41 estimates the friction coefficient of the road surface while driving to estimate whether the friction of the road surface is a high friction surface.

The road surface friction estimating unit 41 can estimate the friction coefficient of the road surface by using a change in the wheel speed measured by the wheel speed measuring unit 10 or the like in order to estimate the friction coefficient of the road surface.

The control unit (50) collectively controls the brake control system (1) of the vehicle (2).

The controller 50 may be a general ECU (Electric Control Unit) that controls and determines the overall operation of the vehicle, or a processor, a memory, and an input / output device in a single chip, (Microcontroller unit).

However, the present invention is not limited to this, and the control unit 50 may be any judgment control means capable of judging and controlling the overall operation of the vehicle.

The control unit 40 may include a determination unit 51, a linear control unit 52, a decompression unit 53, and an ABS entry control unit 54.

When the change in the master cylinder pressure measured by the master cylinder pressure measuring unit 30 is detected, the determining unit 51 may determine whether to perform linear control for giving a comfortable ride feeling to the driver before performing the ABS control have.

The determination unit 51 determines whether the road surface friction estimated through the road surface friction estimation unit 41 is in a preliminary braking state based on the detected pressure change in the master cylinder measured by the master cylinder pressure measurement unit 30 If it is larger than the set threshold value, it is possible to judge whether or not to forcibly reduce the braking pressure of the front wheel in order to prevent the rear wheel lifting phenomenon of the vehicle. The rear wheel lifting phenomenon of the vehicle can be caused by a difference in braking force generated between the front wheel and the rear wheel.

That is, when it is determined that the vehicle is to be braked by the determination unit 51, the linear control unit 52 linearly increases the front wheel pressure to the reference pressure linearly before the ABS control is executed to increase the stability of the vehicle at the time of braking Control the front wheel braking pressure.

In order to prevent the rear wheel lifting due to an increase in the difference in braking force occurring between the front wheel and the rear wheel when the road surface friction coefficient estimated at the time of sudden braking is greater than a preset road surface friction threshold value When the front wheel braking pressure measured by the wheel pressure measuring unit 20 exceeds the reference pressure, the front wheel braking pressure can be forcibly reduced.

The ABS entry control unit 54 controls ABS entry so that ABS control can be performed after braking pressure control of the front wheels is performed by the linear control unit 52 and the pressure reducing unit 53. [

When the ABS entry control unit 54 determines to enter the ABS of the vehicle, the ABS drive unit 60 performs ABS control. Normally, the ABS repeatedly operates and releases the brakes continuously to prevent wheel lock-up during vehicle braking.

2 is a graph showing an embodiment of a conventional vehicle brake control.

3 is a graph showing an embodiment of a vehicle brake control according to the present invention.

As shown in FIG. 2, when the brake is actuated by the user during traveling on a road with large friction, the difference between the front wheel braking pressure 21 and the rear wheel braking pressure 22 suddenly widen, .

Therefore, in order to minimize this, it is possible to sharply reduce the braking pressure of the front wheel to prevent the rear wheel from being lifted. However, there is a problem that the driver feels uncomfortable in the ride feeling.

Therefore, in the embodiment of the present invention, when the degree of change of the pressure value measured by the master cylinder pressure measuring unit 30 is equal to or greater than a predetermined value, when the road surface friction estimated by the road surface friction estimation unit 41 is large, When the braking pressure 23 exceeds the first reference pressure 24, the pressure-reducing section 53 in the control section 50 forcibly reduces the braking pressure 23 of the front wheel to the second reference pressure 25 (a section) .

When the braking pressure 23 of the front wheel reaches the second reference pressure 25 due to the forced reduction in pressure, the braking pressure 23 linearly increases in the linear control unit 52 in the control unit 50, , The ABS entry control unit 54 controls the ABS driving unit 60 to perform ABS control (period c).

FIG. 4 is a graph showing the master cylinder pressure and braking pressure for the vehicle brake control according to the present invention, and FIG. 5 is a graph showing the relationship between the master cylinder pressure for the vehicle brake control at the time of turning and the braking pressure The graph showing the embodiment

When the degree of change of the pressure value measured by the master cylinder pressure measuring section 30 is equal to or greater than a predetermined value and when the road surface friction estimated by the road surface friction estimating section 41 is large, When the dynamic pressure 23 exceeds the first reference pressure 24, the pressure-reducing section 53 in the control section 50 forcibly reduces the braking pressure 53 of the front wheel to the second reference pressure 25 (section a).

 When the braking pressure 23 reaches the second reference pressure 25 due to the forced reduction in pressure, the front control pressure 23 linearly increases in the linear control unit 52 in the control unit 50, (section b), the ABS entry controller 54 controls the ABS driver 60 to perform ABS control (section c).

In this case, linearly increasing the braking pressure 53 before the ABS entry control in the b section may minimize the possibility of the sense of riding feeling that can be transmitted to the driver through the noise and the brake pedal through the linear control.

Also, the braking loss caused by the problem of solving the rear wheel lifting phenomenon can be minimized through the control of forcibly reducing the braking pressure and linearly increasing the braking pressure before the ABS entry control through the a and b sections.

5 is a graph showing one embodiment of master cylinder pressure and front wheel and rear wheel braking pressure for vehicle braking control when the vehicle is turning in accordance with the present invention.

When the turning detection unit 40 senses the turning of the vehicle, it is necessary to control the front left and right front wheels before braking, before entering the ABS. That is, the outer front wheel has a large ground contact area with the road surface during swing, so that the ABS entry control is delayed. On the other hand, in the case of the inner front wheel, the ground contact area with the road surface is wide so that the ABS entry control starts before the outer front wheel.

 Therefore, the determination unit 51 determines that the vehicle is braked by the user through the master cylinder pressure change measured by the master cylinder pressure measurement unit 30, and if the vehicle is in the turning state through the turn detection unit 40 The control unit 50 can control the outer front braking pressure 23-1 and the inner front wheel braking pressure 23-2 through the ABS driving unit 60 differently.

6 to 8 are flowcharts of a brake control method according to embodiments of the present invention.

Specifically, FIG. 6 is a flowchart showing the forced depressurization control and linear control before ABS entry according to the present invention, and FIG. 7 is a flowchart related to a brake control method showing the linear control in detail.

8 is a flow chart of a brake control system in which the vehicle is swiveled, according to another embodiment of the present invention.

According to one embodiment of the present invention, the brake control system measures the pressure of the master cylinder (100).

Specifically, the brake control system can measure the pressure of the master cylinder through the master cylinder pressure measuring unit 30. [

Thereafter, the brake control system determines whether the change in the measured master cylinder pressure value is greater than a reference value (200). Specifically, it can be determined whether or not the change in the master cylinder pressure value measured by the determination section 51 of the brake control system is larger than the reference value.

If the pressure change is greater than the reference value (example of 200), the brake control system estimates the road surface friction coefficient (400). Specifically, the brake control system can estimate the road surface friction coefficient through the road surface friction estimation unit 41 (400).

At this time, if the road surface friction coefficient estimated by the road surface friction estimation unit 41 is larger than the threshold value (YES in 400), the brake control system determines whether the braking pressure 23 exceeds the first reference pressure.

When the braking pressure 23 exceeds the first reference pressure (example of 500), the brake control system forcibly depressurizes the front wheel braking pressure (600). Specifically, the brake control system can reduce the braking pressure of the front wheel through the pressure reducing portion.

Further, if the measured braking pressure does not exceed the first reference pressure (No in 500), the brake control system repeatedly compares the road surface friction coefficient with the threshold value and compares the braking pressure 23 with the first reference pressure do.

Thereafter, the brake control system performs forced depressurization of the front wheel braking pressure (600).

Thereafter, the brake control system determines whether the braking pressure is greater than the first reference pressure (700). Further, if the road surface friction coefficient is smaller than the threshold value (NO in 400), the brake control system can judge whether the braking pressure is larger than the second reference pressure.

When the braking pressure 23 becomes smaller than the second reference pressure (NO in 700), the brake control system ends the forced depressurization and enters the step of executing the linear control (800).

If the braking pressure 23 is larger than the second reference pressure (example of 700), the brake control system performs forced depressurization and repeats comparing the braking pressure and the second reference pressure.

The execution of the linear control is a step prior to entering the ABS. The braking distance is prevented from being lengthened and the driver performs the linear control instead of the stepwise pattern control in order to minimize the inconvenience in the ride comfort.

After this linear control is performed (800), the ABS entry control unit 54 in the control unit 50 operates the ABS driving unit 60.

As shown in FIG. 7, according to an embodiment of the present invention, linear control is performed 800 before ABS control starts according to a control signal of the ABS entry control unit 54 in the control unit 50.

Linear control means that the front wheel braking pressure is linearly increased until the reference pressure is reached before the ABS control is started.

Accordingly, when the front wheel braking pressure measured by the wheel braking pressure measuring unit 20 reaches the reference pressure (YES in 850), the ABS entry control unit 54 performs ABS control (900)

8 is a flow chart of a brake control system in which the vehicle is swiveled, according to another embodiment of the present invention.

According to one embodiment of the present invention, the brake control system measures the pressure of the master cylinder (100). Specifically, the brake control system can measure (100) the pressure of the master cylinder through the master cylinder pressure measurement unit 30. [

At this time, if the master cylinder pressure value rises, the brake control system can determine that the driver intends to brake.

That is, if the change in pressure in the master cylinder measured by the brake control system is greater than the reference value (YES in step 200), the inner front wheel immediately performs ABS control 950 and determines whether the road surface friction coefficient is greater than the threshold value 410 ).

At this time, when the road friction coefficient estimated by the brake control system is larger than the threshold value (410), when the outer front wheel braking pressure is larger than the first reference pressure (510 example), the brake control system performs the forced front- (610). Specifically, the outer front brake braking pressure can be forcibly lowered through the pressure reducing portion 53 of the brake control system (610).

When the outer front wheel braking pressure reaches the second reference pressure (Yes in 710), the outer front wheel performs linear control, and after a predetermined time, the outer front wheel is also controlled by the controller 50 to perform ABS control (910).

As described above, in order to prevent the outer side and the inner side front wheel from being different in ABS entry point, the degree of friction varies depending on the ground contact area with the road surface, and the rear wheel may be lifted.

Further, when the road surface friction coefficient is not larger than the threshold value (NO in 410), the brake control system is operated until the outer front wheel braking pressure reaches the second reference pressure (NO in 710) So as to linearly increase the outer front wheel braking pressure.

Specifically, the outer front brake braking pressure can be linearly increased through the linear control unit 52 of the brake control system.

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 construed as limited to the embodiments set forth herein; It will be understood that various modifications may be made without departing from the spirit and scope of the invention.

1. Brake control system
2. Vehicle
3. Master cylinder pressure sensor

Claims (4)

A wheel braking pressure measuring unit for measuring braking pressures of front and rear wheels of the vehicle;
A master cylinder pressure measuring unit for measuring a master cylinder pressure of the vehicle; And
And a controller for executing anti-lock brake control after linearly increasing the front wheel braking pressure of the vehicle if the change in the master cylinder pressure is larger than a reference value. The method according to claim 1,
Further comprising a road surface friction estimation unit for estimating a road surface friction coefficient of a road in which the vehicle is running,
Wherein the control unit forcibly pressurizes the front wheel braking pressure to a first reference pressure when the estimated road surface friction coefficient is greater than a threshold value, and when the front wheel braking pressure reaches a first reference pressure, Vehicle brake control system. 3. The method of claim 2,
And when the front wheel braking pressure reaches a second reference pressure, executes anti-lock brake control of the vehicle. 4. The method according to any one of claims 1 to 3,
Further comprising: a turning detection unit for detecting turning of the vehicle,
Wherein the control unit sets the braking pressure pattern of the outer front wheel and the inner front wheel differently when the turning detection unit detects the turning of the vehicle.

KR1020150004068A 2015-01-12 2015-01-12 Brake system in a vehicle KR20160086578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150004068A KR20160086578A (en) 2015-01-12 2015-01-12 Brake system in a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150004068A KR20160086578A (en) 2015-01-12 2015-01-12 Brake system in a vehicle

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR1020160095471A Division KR102172168B1 (en) 2016-07-27 2016-07-27 Brake system in a vehicle

Publications (1)

Publication Number Publication Date
KR20160086578A true KR20160086578A (en) 2016-07-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150004068A KR20160086578A (en) 2015-01-12 2015-01-12 Brake system in a vehicle

Country Status (1)

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