KR20120045597A - Electric booster type brake system - Google Patents

Electric booster type brake system Download PDF

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Publication number
KR20120045597A
KR20120045597A KR1020100107230A KR20100107230A KR20120045597A KR 20120045597 A KR20120045597 A KR 20120045597A KR 1020100107230 A KR1020100107230 A KR 1020100107230A KR 20100107230 A KR20100107230 A KR 20100107230A KR 20120045597 A KR20120045597 A KR 20120045597A
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KR
South Korea
Prior art keywords
solenoid valve
line
hydraulic
master cylinder
fail
Prior art date
Application number
KR1020100107230A
Other languages
Korean (ko)
Inventor
이상목
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020100107230A priority Critical patent/KR20120045597A/en
Publication of KR20120045597A publication Critical patent/KR20120045597A/en

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Classifications

    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • B60T13/145—Master cylinder integrated or hydraulically coupled with booster
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
    • 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
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

PURPOSE: An electric booster type brake device reinforces a fail-safe function by maintaining the hydraulic flow into a wheel during the fail, and enhances the cost competitiveness through forming the hydraulic flow line for minimizing the number of solenoid valves for an embodying fail-safe function. CONSTITUTION: An electric booster type brake device comprises a first solenoid valve(21), a second solenoid valve(22), and a third solenoid valve(23). The first solenoid valve is only installed in a second hydraulic line(8) of a pair of hydraulic lines of the first master cylinder(5). The second solenoid valve is installed in a pedal force line(9). The pedal force line is leaded to a pedal simulator(30) from a second master cylinder(6). The third solenoid is installed in a branch line(10). The branch line divaricates from the pedal force line in the front part of the second solenoid valve and is connected to the second hydraulic line from the rear part of the first solenoid valve.

Description

Electric Booster Type Brake System

The present invention relates to an electric booster type braking device, and more particularly, to an electric booster type braking device capable of reinforcing fail-safe while reducing the number of valves for controlling hydraulic flow.

In general, the electric booster type braking device drives a motor to form a front wheel braking pressure, a pedal wheel pressure is used to form a rear wheel braking pressure, and mutual cooperative control is implemented.

To this end, it is equipped with a front wheel master cylinder supplied with oil from an oil reservoir and a motor controlled by an ECU that recognizes a pedal stroke to generate front brake pressure, and supplies oil from an oil reservoir with pedal effort to generate rear brake pressure. Equipped with a receiving rear master cylinder.

In addition, it is typically provided with a pedal simulator for providing a reaction force according to the pedal stroke toward the pedal to feel the pedal response.

The fail-safe function implemented in the electric booster-type braking device as described above typically applies a plurality of solenoid valves and supplies a hydraulic flow toward the master cylinder to form hydraulic pressure by using the solenoid valves. Braking according to the failure of the electric booster is implemented.

However, as described above, the fail-safe implementation using a plurality of solenoid valves may inevitably include operational instability.

For example, due to the open / closed state of the solenoid valve during electrical fail, the hydraulic flow toward the wheel can be maintained to implement fail-safe, but otherwise, the wheel during the failing of the non-electric flow connection hydraulic line The lack of hydraulic flow towards the side prevents fail-safe implementation.

In other words, the fail-safe implementation using the solenoid valve works stably during an electrical fail, but inevitably has an instability that does not work at all in the failure of the hydraulic line.

Accordingly, the present invention in view of the above point is to apply a solenoid valve of the hydraulic line while forming a hydraulic flow to the wheel side during the electrical failure (Fail) as well as during the failure of the hydraulic connection line (Fail) It is an object of the present invention to provide an electric booster-type braking device capable of implementing a stable and further enhanced fail-safe by maintaining a hydraulic flow toward a wheel at a time of failing.

In addition, an object of the present invention is to provide an electric booster-type braking device that can increase the cost competitiveness by configuring a hydraulic line to minimize the number of solenoid valves for implementing fail-safe (Fail-Safe).

The present invention for achieving the above object in the braking device having a second master cylinder for forming the hydraulic pressure by the pedal and the first master cylinder for forming the hydraulic pressure by the electric booster,

A first solenoid valve installed in one hydraulic line of a pair of hydraulic lines connected to the first master cylinder, a second solenoid valve installed in a stepping line leading from the second master cylinder to a pedal simulator, and branching from the stepping line And a third solenoid valve installed at a branch line connected to the hydraulic line in which the first solenoid valve is installed.

The first solenoid valve and the second solenoid valve are applied with a normal close type, and the third solenoid valve is applied with a normal open type.

The branch line branches from the step line at the front end of the second solenoid valve and is connected to the hydraulic line at the rear end of the first solenoid valve.

The present invention is to apply a solenoid valve to form a hydraulic flow toward the wheel when the electric fail (fail) and the hydraulic connection line of the flow path (fail) to implement a stable and further enhanced fail-safe (Fail-Safe) It can be effective.

In addition, the present invention is configured to minimize the number of the solenoid valve of the hydraulic line has the effect of increasing the cost competitiveness due to the reduced solenoid valve.

In addition, the present invention also has the effect that the driver can feel whether the operation of the ABS when the operation of the ABS by shaking the pedal to eliminate the heterogeneity in the operation of the ABS as well.

1 is a configuration of the electric booster brake system according to the present invention, Figure 2 is a regenerative braking operation of the electric booster brake system according to the present invention. Figure 3 is a fail-safe (Fail-Safe) operation of the electric booster brake system according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

1 shows a configuration of an electric booster braking device according to the present invention.

As illustrated, the electric booster type braking device includes an ECU 1 for detecting the movement of the pedal 2 using the pedal sensor 3, and a braking pressure type for generating a braking hydraulic pressure by driving control of the ECU 1. Electronic Stability Control (ESC) 40 which receives the brake portion and the brake fluid pressure generated by the brake pressure forming unit and distributes them to the front and rear wheels, and a wheel cylinder for braking the front and rear wheels with the brake fluid pressure distributed from the ESC 40. It consists of 50.

The ECU 1 implements a braking pressure control that repeats a process of rapidly increasing, maintaining, and reducing a braking pressure from the master cylinder to the wheel cylinder toward the ABS action.

To this end, the ECU 1 receives signals from various sensors, and also receives a signal from a pressure sensor for detecting the pressure of the master cylinder that forms the braking pressure forming unit.

The braking pressure forming unit includes a main braking means for generating a braking hydraulic pressure by driving the electric booster 4 controlled by the ECU 1 and providing the braking pressure of the front wheel and the rear wheel; When the pedal 2 is operated, the virtual pedal response is transmitted to the pedal 2, and the braking hydraulic pressure is generated only by the stroke of the pedal 2 in the section after the boost limit of the electric booster 4, and provided as the braking force of the front wheel and the rear wheel. It consists of a sub braking means.

The main braking means implemented in the present embodiment includes an electric booster 4 and an oil reservoir 6 controlled by the ECU 1 receiving the signal from the pedal sensor 3 detecting the movement of the pedal 2. A pair of first and second hydraulic lines 7 connecting between the first master cylinder 5 generating braking hydraulic pressure through the electric booster 4 and the ESC 40 in the first master cylinder 5; 8).

The electric booster (4) generates a rotational force by the motor, and the screw-nut structure is a structure that presses the master cylinder by converting into a linear motion by receiving the rotational force of the motor, this is a conventional configuration.

The sub braking means includes a second master cylinder 6 for generating braking fluid pressure by the stroke of the pedal 2, and a step line 9 for discharging the braking fluid pressure generated in the second master cylinder 6; A branch line 10 branched from the step line 9 and connected to one of the hydraulic lines 7 and 8 of the hydraulic lines 7 and 8 leading from the first master cylinder 5 at the front end position of the ESC 40; It is composed of a pedal simulator 30 located at the end of the line (9) for transmitting the reaction force toward the pedal (1) using the introduced braking hydraulic pressure.

The second master cylinder 6 commonly uses an oil reservoir for supplying oil to the first master cylinder 5 of the main braking means.

In this embodiment, the branch line 10 is connected to the second hydraulic line 8 so that the second hydraulic line 8 is connected to the stepping line 9.

The pedal simulator 30 has a cylinder having a hydraulic chamber extending to the space occupied by the braking hydraulic pressure introduced thereto, and is pushed when the pressure of the hydraulic chamber increases, and after the full load point exceeding the power limit of the electric booster 5. It is composed of a damper having a piston that can move up to the point where the section is formed and supporting the piston and forming a reaction force according to the movement.

If necessary, the piston may further include a piston stopper for limiting the maximum stroke during movement of the piston, the outer edge of the piston is provided with an airtight member that is in close contact with the inner surface of the cylinder to maintain airtightness.

The sub braking means as described above forms the braking hydraulic pressure only by the pedal (2) side force, and sends it to the ESC (40) to operate the wheel cylinder 50, the same amount of front wheel regenerative braking and rear wheel regenerative braking. It can be implemented or similarly, in particular, to implement a fail-safe (fail-safe) to form a hydraulic flow to the wheel cylinder 50 in the case of an electrical fail (Fail) or hydraulic line connection fail (Fail).

The implementation of such a more stable and enhanced fail-safe is composed of a control valve unit 20 that forms and shuts down a hydraulic flow consisting of a solenoid valve, and in this embodiment, the control valve as three solenoid valves. Configure the unit 20.

That is, the first solenoid valve 21 is installed in the second hydraulic line 8 from the first master cylinder 5 to the ESC 40, and the second solenoid valve 22 is the second master cylinder 6. Is installed in the step line (9) leading to the pedal simulator 30, the third solenoid valve 23 is installed in the branch line (10) leading from the step line (9) to the second hydraulic line (8) Lose.

At this time, the branch line 10 branches to the step line 9 at the front end of the second solenoid valve 22 and is connected to the second hydraulic line 8 at the rear end of the first solenoid valve 21.

The first solenoid valve 21 and the second solenoid valve 22 are of a normal close type, and the third solenoid valve 23 is of a normal open type.

 2 shows the regenerative braking operation of the electric booster type braking device according to the present embodiment.

As shown in the drawing, during regenerative braking, the ECU 1 which recognizes the pedaling force of the pedal 2 using the sensor 3 drives the electric booster 4, and the electric booster 4 Rotation is transmitted to the first master cylinder (5) through a screw-nut structure to operate the first master cylinder (5).

At this time, the ECU 1 drives the electric booster 4 to calculate the braking hydraulic pressure according to the stroke of the pedal 2 detected through the sensor 3 and generate the calculated braking hydraulic pressure.

The hydraulic pressure generated by the operation of the first master cylinder (5) is supplied to the ESC 40 through a pair of first and second hydraulic lines (7, 8), the hydraulic pressure distributed in the ESC (40) is the front wheel and The brake is supplied to the wheel cylinder 50 for braking the rear wheel.

At this time, the first solenoid valve 21 of the normal close type is switched to the open state.

The hydraulic pressure generated in the second master cylinder 6 operated by the pedal 2 when braking by the first master cylinder 5 as described above is supplied to the pedal simulator 30 via the step line 9. The pedal simulator 30 forms a reaction force against the supplied hydraulic pressure.

The reaction force generated by the pedal simulator 30 is transmitted to the second master cylinder 6 via the stepping line 9 again, and the pedal 2 receives the reaction force transmitted to the second master cylinder 6. The driver can feel the pedal power.

At this time, the second solenoid valve 22 of the normal close type is switched to the open state.

However, when the braking is performed, the normal open type third solenoid valve 23 installed in the branch line 10 connecting the stepping line 9 and the second hydraulic line 8 is switched to the closed state. Thus, the hydraulic pressure of the first master cylinder 5 is used for braking and the hydraulic pressure of the second master cylinder 6 is used for pedal reaction force formation through the pedal simulator 30.

3 illustrates a fail-safe operation of the electric booster brake system according to the present embodiment.

As shown, fail-safe always occurs by using three first-to-two solenoid valves 21, 22 and 23, even in the case of an electrical fail or a failure of the hydraulic connection line. Safe) can be implemented.

When the fail-safe is implemented, the first solenoid valve 21 is closed to block the path from the second hydraulic line 8 to the first master cylinder 5, and the path to the ESC 40 is open. The second solenoid valve 22 is closed to open the path leading to the second master cylinder 6 in the stepping line 9 and the path leading to the pedal simulator 30 is blocked.

On the other hand, the third solenoid valve 23 is opened to connect the stepping line 9 and the second hydraulic line 8 to the branching line 10, thereby generating the operation of the pedal 2 in the second master cylinder 6. The flow of the hydraulic pressure can be formed.

As described above, since the first solenoid valve 21 and the second solenoid valve 22 are closed and the third solenoid valve 23 is opened, the first solenoid valve 21 and the second solenoid valve are opened. 22 and the third solenoid valve 23 do not receive any operation signal.

Therefore, even if the electric booster 4 cannot be driven due to an electric fail and no hydraulic pressure is generated using the first master cylinder 5, the hydraulic pressure of the second master cylinder 6, which is operated by the pedal 2, is not sufficient. After passing through the line (9) to the branch line (10) through the third solenoid valve 23 in the open state to exit the branch line (10), the hydraulic pressure exiting the branch line (10) is The first end of the solenoid valve 21 is supplied to the ESC 40 through the second hydraulic line 8 to operate the wheel cylinder 50 to implement a fail-safe.

On the other hand, if a fail occurs in the flow path connection portion (not a fail), the hydraulic flow through the first solenoid valve 21, the second solenoid valve 22 and the third solenoid valve 23 is not formed The first master cylinder (5) operated by the electric booster (4) by connecting the first master cylinder (5) and the ESC (40) to the first hydraulic line (7) without the first solenoid valve (21) installed Fail-Safe is implemented with hydraulic pressure.

As described above, in the present embodiment, the normal closed type first solenoid valve 21, the normal closed type second solenoid valve 22, and the normal open type third solenoid valve 23 installed in the hydraulic circuit are installed, thereby preventing electrical failure ( Fail-safe is implemented through the third solenoid valve 23 which transmits the hydraulic pressure of the second master cylinder 6 at the time of fail, and the electric booster at the time of failing the connection part of the hydraulic line. Fail-Safe can be implemented through the first hydraulic line 7 that delivers the hydraulic pressure of the first master cylinder 5 operated by the N / A to further enhance and stabilize the fail-safe. It can be implemented.

1: ECU 2: Pedal
3: sensor 4: electric booster
5,6: 1st ~ 2nd master cylinder
7,8: hydraulic line 9: power line
10: branch line 20: control valve unit
21,22,23: 1 ~ 2 ~ 3 solenoid valve
30: pedal simulator
40: ESC 50: Wheel cylinder

Claims (3)

A braking device comprising a second master cylinder for generating hydraulic pressure by a pedal and a first master cylinder for generating hydraulic pressure by an electric booster.
A first solenoid valve installed in one hydraulic line of a pair of hydraulic lines connected to the first master cylinder, a second solenoid valve installed in a stepping line leading from the second master cylinder to a pedal simulator, and branching from the stepping line And a third solenoid valve installed at a branch line connected to the hydraulic line provided with the first solenoid valve.
The electric booster type braking device according to claim 1, wherein the first solenoid valve and the second solenoid valve are of a normal close type, and the third solenoid valve is of a normal open type.
The braking device of claim 1, wherein the branch line is branched from the step line at a front end of the second solenoid valve and connected to the hydraulic line at a rear end of the first solenoid valve.

KR1020100107230A 2010-10-29 2010-10-29 Electric booster type brake system KR20120045597A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100107230A KR20120045597A (en) 2010-10-29 2010-10-29 Electric booster type brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100107230A KR20120045597A (en) 2010-10-29 2010-10-29 Electric booster type brake system

Publications (1)

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KR20120045597A true KR20120045597A (en) 2012-05-09

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KR1020100107230A KR20120045597A (en) 2010-10-29 2010-10-29 Electric booster type brake system

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160019676A (en) * 2014-08-12 2016-02-22 현대자동차주식회사 Electro-hydraulic brake system for vehicle
US10518762B2 (en) 2017-06-28 2019-12-31 Hyundai Mobis Co., Ltd. Electric booster
CN113085997A (en) * 2021-04-26 2021-07-09 精诚工科汽车系统有限公司 Electric booster of vehicle and vehicle
WO2021218264A1 (en) * 2020-04-29 2021-11-04 华为技术有限公司 Hydraulic adjustment unit of brake system in automobile, brake system, and control method
US11273817B2 (en) 2019-07-16 2022-03-15 Hyundai Mobis Co., Ltd. Electric booster
US11285931B2 (en) 2019-03-19 2022-03-29 Hyundai Mobis Co., Ltd. Electric booster

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160019676A (en) * 2014-08-12 2016-02-22 현대자동차주식회사 Electro-hydraulic brake system for vehicle
US10518762B2 (en) 2017-06-28 2019-12-31 Hyundai Mobis Co., Ltd. Electric booster
US11285931B2 (en) 2019-03-19 2022-03-29 Hyundai Mobis Co., Ltd. Electric booster
US11273817B2 (en) 2019-07-16 2022-03-15 Hyundai Mobis Co., Ltd. Electric booster
WO2021218264A1 (en) * 2020-04-29 2021-11-04 华为技术有限公司 Hydraulic adjustment unit of brake system in automobile, brake system, and control method
CN113085997A (en) * 2021-04-26 2021-07-09 精诚工科汽车系统有限公司 Electric booster of vehicle and vehicle

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