KR20120031391A - Fale-safe improving electric booster type brake system - Google Patents

Fale-safe improving electric booster type brake system Download PDF

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Publication number
KR20120031391A
KR20120031391A KR1020100092906A KR20100092906A KR20120031391A KR 20120031391 A KR20120031391 A KR 20120031391A KR 1020100092906 A KR1020100092906 A KR 1020100092906A KR 20100092906 A KR20100092906 A KR 20100092906A KR 20120031391 A KR20120031391 A KR 20120031391A
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KR
South Korea
Prior art keywords
master cylinder
electric booster
braking
type
pedal
Prior art date
Application number
KR1020100092906A
Other languages
Korean (ko)
Inventor
김필구
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 KR1020100092906A priority Critical patent/KR20120031391A/en
Publication of KR20120031391A publication Critical patent/KR20120031391A/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
    • B60T13/74—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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • 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
    • B60T8/40—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 comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/92—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action
    • B60T8/94—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action on a fluid pressure regulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking

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

Abstract

The electric booster type braking device of the present invention includes a main master cylinder (5) for forming a brake hydraulic pressure with the electric booster (4), and a pedal simulator (30) for providing pedal reaction force by forming hydraulic pressure only by the operation of the pedal (2). The sub master cylinder 20 to be supplied, and the sub master cylinder 20 and the main master cylinder 5 side are directly connected to the branch line 22 having one control valve 24, the conduction booster Simplify the configuration for fail-safe due to the failure of (4) and reduce the cost by reducing the quantity of solenoid valves.

Description

Fail-Safe Improving 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 with enhanced fail-safe function.

In general, the electric booster type braking system includes a motor-type electric booster for forming front and rear wheel braking pressure, a pair of master cylinders, a pedal simulator for forming a reaction force of the driver, four solenoid valves for opening and closing a flow path, It consists of a pedal stroke sensor and an ECU for controlling the electric booster.

When the driver presses the pedal, the electric booster type braking device is closed with three of the four solenoid valves and one is open so that the pressure of the master cylinder connected to the pedal is transmitted to the pedal simulator, and through the reaction force of the piston and the spring of the pedal simulator. The driver can feel the power on the pedals.

On the other hand, the required braking force (braking pressure) of the front and rear brakes is generated when the ECU receiving the pedal stroke sensor signal drives the electric booster, thereby generating a braking force by supplying the master cylinder to the front and rear wheel braking pressure through the electric booster. Done.

In general, even if a fail occurs due to an electric error in the electric booster type braking device, a fail-safe operation may be implemented by only operating a pedal, which is a pressure line connected to a master cylinder connected to a pedal through a solenoid valve. It is supplied, and the hydraulic line is connected to the front and rear wheels because the braking force is generated in the front and rear wheels.

However, the hydraulic line of the electric booster type braking device is connected to each other by a hydraulic line connected to the master cylinder linked to the electric booster, and a connecting hydraulic line connected to the master cylinder linked to the pedal, so that only the solenoid valve installed on the connecting hydraulic line side In a closed hydraulic line fail situation, braking pressure in the front and rear wheels using the master cylinder linked to the electric booster may be impossible.

Accordingly, the present invention in view of the above point by directly connecting the hydraulic line of the pedal operated master cylinder to the master cylinder operated by the electric booster, while reducing the number of solenoid valves installed in the hydraulic line while failing the hydraulic line It is an object of the present invention to provide an electric booster-type braking device that can enhance the fail-safe function.

The present invention for achieving the above object is to operate by braking is operated through a sub-master cylinder to form a hydraulic pressure by the pedal to supply to the pedal simulator to provide a pedal reaction force, and an electric booster controlled by the ECU that detects the stroke of the pedal In the electric booster type braking device composed of a main master cylinder for forming hydraulic pressure,

When the electric booster fails, the sub master cylinder and the main master cylinder are directly connected by a branch line to use the hydraulic pressure of the sub master cylinder as the braking hydraulic pressure in the main master cylinder.

The branching line branches one end at a step line connecting the sub master cylinder and the pedal simulator and connects the other side directly to the main master cylinder.

The branch line is provided with one normal open type control valve, and the stepping line is provided with another control valve of the normal close type.

When the control valve of the branch line is opened, the control valve of the stepping line is closed to block the hydraulic flow of the pedal simulator.

The main master cylinder has first and second chambers forming inner spaces of cylinders opposed to each other on the basis of the connecting portion of the branch line, and the main piston driven through the electric booster is accommodated in the inner space.

Hydraulic lines are respectively connected to the first and second chambers, leading to ESCs for distributing braking hydraulic pressure to wheel cylinders.

The present invention can directly connect the hydraulic line of the master cylinder linked to the pedal to the master cylinder linked to the electric booster to form a braking pressure even when the hydraulic line fails to enhance the fail-safe function, a pair of master cylinder By simplifying the hydraulic line between the two, the number of solenoid valves is reduced, thereby reducing the number of parts and reducing the cost.

1 is a configuration diagram of a fail-safe reinforced type electric booster braking device according to the present invention, Figure 2 is an operation diagram during normal braking and regenerative braking of the electric booster braking device according to the present invention, Figure 3 is The fail-safe operation state of the electric booster-type braking device according to.

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 is a block diagram of a fail-safe enhanced type electric booster brake system according to the present invention.

As shown, the electric booster brake system is driven by the ECU 1 which detects the movement of the pedal 2 using the pedal sensor 3 and the electric booster 4 controlled by the ECU 1. The main braking means for generating braking hydraulic pressure and providing the braking force of the front wheel and the rear wheel, and transmitting the virtual pedal response to the pedal 2 when the pedal 2 is operated, and in the section after the boosting limit of the electric booster 4. A sub braking means for forming braking hydraulic pressure only by the stroke of the pedal 2 and providing the braking force of the front and rear wheels, and an ESC (40, Electronic Stability Control) which receives and distributes the braking hydraulic pressure generated from the braking means toward the front and rear wheels. And a wheel cylinder 50 for braking the front and rear wheels with the braking hydraulic pressure distributed by the ESC 40.

The electric booster-type braking device configured as described above is widely applied, and in this embodiment, the main master cylinder 5 forming the braking hydraulic pressure through the electric booster 4 of the main braking means is different.

That is, the main master cylinder 5 includes a main piston 6 driven through the electric booster 4, first and second chambers 7a, which receive the piston 6 and are connected to the oil reservoir 9. A cylinder 7 having the 7b) opposed to each other, and a sub-piston which is elastically supported by a return spring in the first and second chambers 7a and 7b and creates pressure on oil when the piston 6 is operated. 8).

Hydraulic lines 10 and 11 which are connected to the first and second chambers 7a and 7b to supply the braking hydraulic pressure to the ESC 40 are respectively connected.

As the structure of the main master cylinder 5 is changed as described above, the sub master cylinder 20 and the pedal simulator 30 of the sub braking means are branched from the step line 21 having the first control valve 23. Thus, the connection position of the branch line 22 for implementing fail-safe is also changed.

The first control valve 23 is applied to the NC type of Normal Close (Normal Close)

In the present embodiment, the branch line 22 is directly connected to the main master cylinder 5, specifically, to a position where oil is supplied to the first and second chambers 7a and 7b.

A second control valve 24 is installed in the branch line 22, and the second control valve 24 is NO type which is normally open.

Figure 2 shows the normal braking and regenerative braking operation of the electric booster brake system according to the present embodiment.

As shown, since normal operation is implemented during normal braking and regenerative braking, the first control valve 23 is open and the second control valve 24 is in a closed state.

Since the first control valve 23 is open as described above, the hydraulic pressure generated in the sub master cylinder 20 through the pedal 2 is supplied to the pedal simulator 30 along the step line 21, and the pedal simulator 30 generates a reaction force is provided to the pedal (2).

In addition, the brake hydraulic pressure generated in the main master cylinder 5 through the electric booster 4 driven by the ECU 1 is transferred to the hydraulic lines 10 and 11 connected to the first and second chambers 7a and 7b, respectively. The brake fluid pressure discharged through the hydraulic lines 10 and 11 is supplied to the wheel cylinder 50 through the hydraulic lines branched toward the front wheels and the rear wheels via the ESC 40 to brake the wheels.

3 is a failsafe operation state diagram of the electric booster-type braking apparatus according to the present embodiment.

As shown, braking hydraulic pressure is not generated through the electric booster 4 in the main master cylinder 5, but hydraulic pressure is generated only in the sub master cylinder 20 operated through the pedal 2.

In this case, since fail-safe is implemented, the first control valve 23 is closed and the second control valve 24 is in an open state.

Accordingly, the hydraulic pressure generated in the sub master cylinder 20 and discharged into the step line 21 is blocked by the first control valve 23 and flows toward the branch line 22, and the hydraulic pressure flowing toward the branch line 22. Is supplied to the main master cylinder (5) via the open second control valve (24).

As described above, the hydraulic pressure provided from the sub master cylinder 20 to the main master cylinder 5 flows into the first and second chambers 7a and 7b, and the hydraulic pressure flowed into the first and second chambers 7a and 7b. It is discharged to the braking liquid pressure through the hydraulic lines (10, 11) connected to the first and second chambers (7a, 7b), respectively.

When the braking hydraulic pressure discharged through the hydraulic lines 10 and 11 is supplied to the ESC 40, the ESC 40 supplies the braking hydraulic pressure to the wheel cylinder 50 through the hydraulic lines branched toward the front wheel and the rear wheel. The wheels will be braked fail-safe.

As described above, in the present embodiment, the main master cylinder 5 forming the braking hydraulic pressure with the electric booster 4 has the sub master cylinder 20 and the branch line 22 forming the hydraulic pressure only by the operation of the pedal 2. By being directly connected to, the configuration for fail-safe according to the failure of the electric booster 4 can be simplified and the cost can be reduced by reducing the number of solenoid valves, and in particular, the fail-safe function can be enhanced.

1: ECU 2: Pedal
3: sensor 4: electric booster
5,20: Main sub master cylinder
6: main piston 7: cylinder
7a, 7b: 1st-2 chamber 8: sub piston
9: Oil reservoir 10,11: Hydraulic line
21: answer line 22: branch line
23,24: 1st and 2nd control valve
30: pedal simulator
40: ESC 50: Wheel cylinder

Claims (6)

An electric motor consisting of a main master cylinder that generates braking hydraulic pressure by operating a sub master cylinder that generates hydraulic pressure by a pedal and supplies the pedal simulator to provide pedal reaction force, and an electric booster controlled by the ECU that senses the stroke of the pedal. In booster type braking system,
Fail-safe reinforced type electric booster characterized in that the direct connection between the sub master cylinder and the main master cylinder in a branch line to use the hydraulic pressure of the sub master cylinder in the main master cylinder when braking when the electric booster fails. Anti-braking system.
The fail-safe strengthening type electric booster type braking apparatus according to claim 1, wherein the branching line is branched from a step line connecting the sub master cylinder and the pedal simulator, and the other side is directly connected to the main master cylinder. .
The method according to claim 2, wherein the branch line is provided with one normal open type control valve, the step line is provided with another control valve of the normal close type (Normal Close) type Fail-safe reinforcement type electric booster braking system.
The fail-safe strengthening type electric booster type braking apparatus according to claim 3, wherein when the control valve of the branch line is opened, the control valve of the stepping line is closed to block the hydraulic flow of the pedal simulator.
The main master cylinder of claim 2, wherein the first and second chambers forming the inner spaces of the cylinders facing each other based on the connection portion of the branch line are formed, and the main piston driven through the electric booster is formed into the inner space. A fail-safe enhanced type electric booster braking device, characterized in that it is accommodated.
The fail-safe strengthening type electric booster type braking apparatus according to claim 5, wherein a hydraulic line is connected to the first and second chambers, respectively, and leads to an ESC that distributes braking hydraulic pressure to a wheel cylinder.
KR1020100092906A 2010-09-24 2010-09-24 Fale-safe improving electric booster type brake system KR20120031391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100092906A KR20120031391A (en) 2010-09-24 2010-09-24 Fale-safe improving electric booster type brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100092906A KR20120031391A (en) 2010-09-24 2010-09-24 Fale-safe improving electric booster type brake system

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KR20120031391A true KR20120031391A (en) 2012-04-03

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140125544A (en) * 2013-04-19 2014-10-29 현대모비스 주식회사 Method of detecting solenoid valve failure of vehicle electric brake booster and Apparatus for detecting failure implementing the same
KR20160019676A (en) * 2014-08-12 2016-02-22 현대자동차주식회사 Electro-hydraulic brake system for vehicle
KR101724969B1 (en) * 2015-12-11 2017-04-07 현대자동차주식회사 Brake system having pedal simulator
CN108016420A (en) * 2017-12-20 2018-05-11 芜湖伯特利电子控制系统有限公司 Master cylinder structure of electronic wire control brake system
CN110316170A (en) * 2019-07-19 2019-10-11 赵海荣 A kind of automobile brake aid-device of decoupling
CN110654362A (en) * 2019-10-23 2020-01-07 清华大学 Automobile line control brake system
WO2021133115A1 (en) * 2019-12-27 2021-07-01 주식회사 만도 Electronic brake system and control method therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140125544A (en) * 2013-04-19 2014-10-29 현대모비스 주식회사 Method of detecting solenoid valve failure of vehicle electric brake booster and Apparatus for detecting failure implementing the same
KR20160019676A (en) * 2014-08-12 2016-02-22 현대자동차주식회사 Electro-hydraulic brake system for vehicle
KR101724969B1 (en) * 2015-12-11 2017-04-07 현대자동차주식회사 Brake system having pedal simulator
US9914439B2 (en) 2015-12-11 2018-03-13 Hyundai Motor Company Brake system having pedal simulator
CN108016420A (en) * 2017-12-20 2018-05-11 芜湖伯特利电子控制系统有限公司 Master cylinder structure of electronic wire control brake system
CN110316170A (en) * 2019-07-19 2019-10-11 赵海荣 A kind of automobile brake aid-device of decoupling
CN110654362A (en) * 2019-10-23 2020-01-07 清华大学 Automobile line control brake system
WO2021133115A1 (en) * 2019-12-27 2021-07-01 주식회사 만도 Electronic brake system and control method therefor

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