WO2004043755A1 - A brake system of an automobile - Google Patents

A brake system of an automobile Download PDF

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Publication number
WO2004043755A1
WO2004043755A1 PCT/KR2003/002404 KR0302404W WO2004043755A1 WO 2004043755 A1 WO2004043755 A1 WO 2004043755A1 KR 0302404 W KR0302404 W KR 0302404W WO 2004043755 A1 WO2004043755 A1 WO 2004043755A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
pressure
velocity
automobile
oil pressure
Prior art date
Application number
PCT/KR2003/002404
Other languages
French (fr)
Inventor
Cheol-Soo Yoon
Original Assignee
Cheol-Soo Yoon
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 Cheol-Soo Yoon filed Critical Cheol-Soo Yoon
Priority to AU2003276762A priority Critical patent/AU2003276762A1/en
Publication of WO2004043755A1 publication Critical patent/WO2004043755A1/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
    • 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed 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
    • 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
    • B60T13/741—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 an ultimate actuator
    • 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
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • 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
    • B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
    • B60T8/17616—Microprocessor-based 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4208—Debooster systems
    • B60T8/4266—Debooster systems having an electro-mechanically actuated expansion unit, e.g. solenoid, electric motor, piezo stack
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • B60Y2400/3032—Wheel speed sensors
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/306—Pressure sensors
    • 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

Definitions

  • the present invention relates generally to a brake system of an automobile, and more particularly to a brake system of an automobile comprising a release valve and a decompression cylinder on a brake oil pressure line for reducing brake pressure when the brake is actuated so that any slip due to lock of wheels of the automobile is prevented when the brake is actuated, thereby minimizing a braking distance.
  • an automobile is provided with a brake system for reducing velocity of the automobile or stopping the automobile when the automobile is driven.
  • a brake system comprises: a brake pedal for converting a handling force by the foot of a driver into mechanical energy; a master cylinder for converting the mechanical energy from the brake pedal into oil pressure energy; a brake oil pressure line for delivering the oil pressure energy generated in the master cylinder to each of the wheels; a wheel cylinder for converting the oil pressure energy supplied via the brake oil pressure line into mechanical energy; and a brake unit for reducing the rotation of the wheels by means of the mechanical energy from the wheel cylinder.
  • the brake unit comprises a disc attached to the wheel and a brake pad arranged in friction contact with the disc.
  • the brake unit comprises a drum attached to the wheel and a brake shoe arranged in friction contact with the drum.
  • the handling force of the driver is converted into mechanical energy by means of the brake pedal, and the mechanical energy is delivered to the master cylinder.
  • the mechanical energy delivered to the master cylinder is converted into oil pressure energy, which is supplied to the wheel cylinder via the brake oil pressure line.
  • the oil pressure energy supplied to the wheel cylinder is converted back into mechanical energy, which actuates the brake unit. As a result, the rotation speed of the wheel is reduced so that the automobile is stopped.
  • ABS anti-lock brake system
  • the present invention is disclosed in order to overcome the aforesaid drawbacks of the prior art.
  • Fig. 1 is a view of the structure of a brake system of an automobile according to a preferred embodiment of the present invention
  • Fig. 2 is a sectional side view of a decompression cylinder of a preferred embodiment of the present invention
  • Fig. 3 is a sectional side view of a decompression cylinder of another preferred embodiment of the present invention
  • Fig. 4 is a sectional view of means for changing brake pressure of a preferred embodiment of the present invention
  • Fig. 5 is a sectional view of means for changing brake pressure of another preferred embodiment of the present invention.
  • Fig. 6 is a sectional view of means for changing brake pressure of still another preferred embodiment of the present invent ion.
  • Fig. 7 is a sectional view of means for changing brake pressure of still another preferred embodiment of the present invention.
  • the present invention which is proposed to prevent any slip due to lock of wheels of the automobile when the brake is actuated, thereby minimizing a braking distance, provides a brake system of an automobile, comprising a brake pedal 510 for converting a handling force by the foot of a driver into mechanical energy; a master cylinder 520 for converting the mechanical energy from the brake pedal 510 into oil pressure energy; a brake oil pressure line 530 for delivering the oil pressure energy generated in the master cylinder 520 to each of the wheels; a wheel cylinder 540 for converting the oil pressure energy supplied via the brake oil pressure line 530 into mechanical energy; and a brake unit for reducing the rotation of the wheels by means of the mechanical energy from the wheel cylinder 540, characterized in that said brake system comprises a wheel velocity sensor 120 for sensing velocity of a wheel; an automobile velocity sensor 130 for sensing velocity of the automobile; a controller 110 for comparing the velocity inputted from said wheel velocity sensor 120 with the velocity from said automobile velocity sensor 130 and generating a control signal if the difference between the two
  • said depression cylinder 300 comprises a decompression control unit 313 screwed to control pressurizing pressure of a decompression spring 312 pressurizing a decompression plunger 311 for controlling decompressing pressure
  • said decompression control unit 313 comprises a control unit actuating member 320 controlled by said controller 110 for rotating said decompression control unit 313 in such a manner that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line 530.
  • said release valve 200 is provided at the rear end thereof with means for changing brake pressure 400 so that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line 530 depending on the control of said controller 110.
  • said means for changing brake pressure 400 comprises: a connection line 411 connected with said brake oil pressure line 530; a variable pressure cylinder 412 having predetermined capacity to release and store the brake fluid of said brake oil pressure line 530 via said connection line 411; and a variable pressure plunger 413 received sliding movably in said variable pressure cylinder 412 and controlled by said controller 110 for releasing and pressurizing the brake fluid on said brake oil pressure line 530, said variable pressure plunger being capable of sliding by means of an actuator, or a screw plunger 431 received sliding movably in said variable pressure cylinder 412 and controlled by said controller 110 for releasing and pressurizing the brake fluid on said brake oil pressure line 530, said screw plunger being capable of rotating by means of a plunger actuating member 432.
  • said actuator may be a screw shaft actuator 421 comprising a screw shaft 421a and a driving motor 421b attached to the rear end of said variable pressure plunger 413, an oil and air pressure actuator 422 comprising a piston rod 422a attached to the rear end of said variable pressure plunger 413, said oil and air pressure actuator being operated by means of oil pressure or air pressure, or a solenoid actuator 423 comprising an armature 423a attached to the rear end of said variable pressure plunger 413.
  • the brake system further comprises a pressure sensor 140 for inputting a pressure signal to said controller 110 in such a manner that the operation of said means for changing brake pressure can be controlled accurately depending on the pressure of the brake fluid.
  • the brake system comprising a wheel velocity sensor 120 for sensing velocity of a wheel; an automobile velocity sensor 130 for sensing velocity of the automobile; a controller 110 for comparing the velocity inputted from said wheel velocity sensor 120 with the velocity from said automobile velocity sensor 130 and generating a control signal if the difference between the two velocities exceeds velocity difference by which maximum deceleration is generated; a release valve 200 controlled by said controller 110 for releasing oil pressure on a brake oil pressure line 530; and a decompression cylinder 300 for elastically filling brake fluid released from said release valve 200 to reduce said brake fluid to predetermined pressure, as mentioned above, the oil pressure on the brake oil pressure line 530 rises rapidly and the brake unit is actuated so that the velocity of the wheel is reduced rapidly.
  • the controller 110 compares the velocity of the wheel inputted from the wheel velocity sensor 120 with the velocity of the automobile inputted from the automobile velocity sensor 130. If the difference between the velocity of the wheel and the velocity of the automobile exceeds the range in which the difference between the velocity of the wheel and the velocity of the automobile has a maximum frictional resistance to obtain the maximum deceleration and the slip of the wheel is about to occur, the controller 110 outputs a decompression signal to the release valve 200.
  • the release valve 200 to which the decompression signal has been inputted from the controller 110, releases the brake fluid on the brake oil pressure line 530, and the released brake fluid is elastically filled into the decompression cylinder 300.
  • the brake pressure is reduced as mentioned above, the decompression of the wheel is reduced, and thus the difference between the velocity of the wheel and the velocity of the automobile is in the predetermined range. Consequently, a minimum braking distance is secured with no slip of the wheel. Furthermore, the control unit actuating member 320 for rotating the decompression control unit 313 of the decompression cylinder 300 is provided and the means for changing brake pressure 400 is provided at the rear end of the release valve 200. Consequently, it is possible to adjust the amount of the brake fluid released depending on the difference between the velocity of the wheel and the velocity of the automobile so that the brake pressure on the brake oil pressure line 530 is controlled to maintain the best deceleration.
  • the brake system since the brake system according to the present invention comprises the release valve for releasing the brake fluid depending on the difference between the velocity of the wheel and the velocity of the automobile and the decompression cylinder, the braking operation is accomplished while the difference between the velocity of the wheel and the velocity of the automobile has the maximum deceleration when the brake is actuated, thereby preventing any slip due to lock of wheels of the automobile and minimizing a braking distance.

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

Abstract

The present invention relates to a brake system of an automobile.The brake system of the present invention comprises: a wheel velocity sensor (120) for sensing velocity of a wheel; an automobile velocity sensor (130) for sensing velocity of the automobile; a controller (110) for comparing the velocity inputted from said wheel velocity sensor (120) with the velocity from said automobile velocity sensor (130) and generating a control signal if the difference between the two velocities exceeds velocity difference by which maximum deceleration is generated; a release valve (200) controlled by said controller (110) for releasing oil pressure on a brake oil pressure line (530); and a decompression cylinder (300) for elastically filling brake fluid released from said release valve (200) to reduce said brake fluid to predetermined pressure.

Description

TITLE A BRAKE SYSTEM OF AN AUTOMOBILE
TECHNICAL FIELD The present invention relates generally to a brake system of an automobile, and more particularly to a brake system of an automobile comprising a release valve and a decompression cylinder on a brake oil pressure line for reducing brake pressure when the brake is actuated so that any slip due to lock of wheels of the automobile is prevented when the brake is actuated, thereby minimizing a braking distance.
BACKGROUND ART
Generally, an automobile is provided with a brake system for reducing velocity of the automobile or stopping the automobile when the automobile is driven. Such a brake system comprises: a brake pedal for converting a handling force by the foot of a driver into mechanical energy; a master cylinder for converting the mechanical energy from the brake pedal into oil pressure energy; a brake oil pressure line for delivering the oil pressure energy generated in the master cylinder to each of the wheels; a wheel cylinder for converting the oil pressure energy supplied via the brake oil pressure line into mechanical energy; and a brake unit for reducing the rotation of the wheels by means of the mechanical energy from the wheel cylinder.
The brake unit comprises a disc attached to the wheel and a brake pad arranged in friction contact with the disc. Alternatively, the brake unit comprises a drum attached to the wheel and a brake shoe arranged in friction contact with the drum.
According to the conventional brake system as mentioned above, if a driver steps on the brake pedal to reduce velocity of an automobile or stop the automobile when the automobile is driven, the handling force of the driver is converted into mechanical energy by means of the brake pedal, and the mechanical energy is delivered to the master cylinder. The mechanical energy delivered to the master cylinder is converted into oil pressure energy, which is supplied to the wheel cylinder via the brake oil pressure line. The oil pressure energy supplied to the wheel cylinder is converted back into mechanical energy, which actuates the brake unit. As a result, the rotation speed of the wheel is reduced so that the automobile is stopped. In the automobile with the conventional brake system constructed as mentioned above, however, if the driver steps on the brake pedal to reduce velocity of an automobile or stop the automobile when the automobile is driven, the velocity of the wheel at the outer circumference thereof is reduced below the velocity of the automobile, and the wheel is in friction contact with the surface of the road. As a result, the velocity of the automobile is reduced. At this time, the wheel of the automobile slides on the surface of the road if the difference between the velocity of the wheel at the outer circumference thereof and the velocity of the automobile is large. If the wheel of the automobile slides on the surface of the road, the friction force between the wheel and the surface of the road is lost to generate a lock phenomenon, by which the wheel is no more rotated. Consequently, the braking distance may be extended rapidly.
In order to prevent any lock of the wheel, an anti-lock brake system (ABS) has been proposed, by which the oil pressure is interrupted so that the lock is released when the wheel is locked due to the sliding caused by the difference between the velocity of the wheel and the velocity of the automobile as mentioned above, and the oil pressure is supplied again to the brake unit when the rotating speed of the wheel reaches a constant speed.
With such an anti-lock brake system, however, there occurs a skid mark due to wear, which is an actual slide of the wheel, between the operation after a release of the brake unit and the next release. The life span of the wheel may be shortened due to such wear as mentioned above, and biased wear may be caused. DISCLOSURE OF THE INVENTION
The present invention is disclosed in order to overcome the aforesaid drawbacks of the prior art.
It is an object of the present invention to provide a brake system of an automobile comprising a release valve and a decompression cylinder on a brake oil pressure line for reducing brake oil pressure in such a manner that the difference between the wheel velocity and the automobile velocity has maximum deceleration to prevent any slip due to lock of wheels of the automobile when the brake is actuated, thereby minimizing a braking distance.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiments of the present invention will hereinafter be described in conjunction with the accompanying drawings in which:
Fig. 1 is a view of the structure of a brake system of an automobile according to a preferred embodiment of the present invention; Fig. 2 is a sectional side view of a decompression cylinder of a preferred embodiment of the present invention;
Fig. 3 is a sectional side view of a decompression cylinder of another preferred embodiment of the present invention; Fig. 4 is a sectional view of means for changing brake pressure of a preferred embodiment of the present invention;
Fig. 5 is a sectional view of means for changing brake pressure of another preferred embodiment of the present invention;
Fig. 6 is a sectional view of means for changing brake pressure of still another preferred embodiment of the present invent ion; and
Fig. 7 is a sectional view of means for changing brake pressure of still another preferred embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The present invention, which is proposed to prevent any slip due to lock of wheels of the automobile when the brake is actuated, thereby minimizing a braking distance, provides a brake system of an automobile, comprising a brake pedal 510 for converting a handling force by the foot of a driver into mechanical energy; a master cylinder 520 for converting the mechanical energy from the brake pedal 510 into oil pressure energy; a brake oil pressure line 530 for delivering the oil pressure energy generated in the master cylinder 520 to each of the wheels; a wheel cylinder 540 for converting the oil pressure energy supplied via the brake oil pressure line 530 into mechanical energy; and a brake unit for reducing the rotation of the wheels by means of the mechanical energy from the wheel cylinder 540, characterized in that said brake system comprises a wheel velocity sensor 120 for sensing velocity of a wheel; an automobile velocity sensor 130 for sensing velocity of the automobile; a controller 110 for comparing the velocity inputted from said wheel velocity sensor 120 with the velocity from said automobile velocity sensor 130 and generating a control signal if the difference between the two velocities exceeds velocity difference by which maximum deceleration is generated; a release valve 200 controlled by said controller 110 for releasing oil pressure on a brake oil pressure line 530; and a decompression cylinder 300 for elastically filling brake fluid released from said release valve 200 to reduce said brake fluid to predetermined pressure.
In a preferred embodiment of the present invention, said depression cylinder 300 comprises a decompression control unit 313 screwed to control pressurizing pressure of a decompression spring 312 pressurizing a decompression plunger 311 for controlling decompressing pressure, and said decompression control unit 313 comprises a control unit actuating member 320 controlled by said controller 110 for rotating said decompression control unit 313 in such a manner that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line 530. In another preferred embodiment of the present invention, said release valve 200 is provided at the rear end thereof with means for changing brake pressure 400 so that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line 530 depending on the control of said controller 110.
Here, said means for changing brake pressure 400 comprises: a connection line 411 connected with said brake oil pressure line 530; a variable pressure cylinder 412 having predetermined capacity to release and store the brake fluid of said brake oil pressure line 530 via said connection line 411; and a variable pressure plunger 413 received sliding movably in said variable pressure cylinder 412 and controlled by said controller 110 for releasing and pressurizing the brake fluid on said brake oil pressure line 530, said variable pressure plunger being capable of sliding by means of an actuator, or a screw plunger 431 received sliding movably in said variable pressure cylinder 412 and controlled by said controller 110 for releasing and pressurizing the brake fluid on said brake oil pressure line 530, said screw plunger being capable of rotating by means of a plunger actuating member 432.
In still another preferred embodiment of the present invention, said actuator may be a screw shaft actuator 421 comprising a screw shaft 421a and a driving motor 421b attached to the rear end of said variable pressure plunger 413, an oil and air pressure actuator 422 comprising a piston rod 422a attached to the rear end of said variable pressure plunger 413, said oil and air pressure actuator being operated by means of oil pressure or air pressure, or a solenoid actuator 423 comprising an armature 423a attached to the rear end of said variable pressure plunger 413.
In still another preferred embodiment of the present invention, the brake system further comprises a pressure sensor 140 for inputting a pressure signal to said controller 110 in such a manner that the operation of said means for changing brake pressure can be controlled accurately depending on the pressure of the brake fluid.
Now, the operation of the present invention will be described.
If a driver steps rapidly on the brake pedal of an automobile when he or she drives the automobile with the brake system comprising a wheel velocity sensor 120 for sensing velocity of a wheel; an automobile velocity sensor 130 for sensing velocity of the automobile; a controller 110 for comparing the velocity inputted from said wheel velocity sensor 120 with the velocity from said automobile velocity sensor 130 and generating a control signal if the difference between the two velocities exceeds velocity difference by which maximum deceleration is generated; a release valve 200 controlled by said controller 110 for releasing oil pressure on a brake oil pressure line 530; and a decompression cylinder 300 for elastically filling brake fluid released from said release valve 200 to reduce said brake fluid to predetermined pressure, as mentioned above, the oil pressure on the brake oil pressure line 530 rises rapidly and the brake unit is actuated so that the velocity of the wheel is reduced rapidly.
At this time, the controller 110 compares the velocity of the wheel inputted from the wheel velocity sensor 120 with the velocity of the automobile inputted from the automobile velocity sensor 130. If the difference between the velocity of the wheel and the velocity of the automobile exceeds the range in which the difference between the velocity of the wheel and the velocity of the automobile has a maximum frictional resistance to obtain the maximum deceleration and the slip of the wheel is about to occur, the controller 110 outputs a decompression signal to the release valve 200. The release valve 200, to which the decompression signal has been inputted from the controller 110, releases the brake fluid on the brake oil pressure line 530, and the released brake fluid is elastically filled into the decompression cylinder 300. If the brake pressure is reduced as mentioned above, the decompression of the wheel is reduced, and thus the difference between the velocity of the wheel and the velocity of the automobile is in the predetermined range. Consequently, a minimum braking distance is secured with no slip of the wheel. Furthermore, the control unit actuating member 320 for rotating the decompression control unit 313 of the decompression cylinder 300 is provided and the means for changing brake pressure 400 is provided at the rear end of the release valve 200. Consequently, it is possible to adjust the amount of the brake fluid released depending on the difference between the velocity of the wheel and the velocity of the automobile so that the brake pressure on the brake oil pressure line 530 is controlled to maintain the best deceleration.
INDUSTRIAL APPLICABILITY
Accordingly, since the brake system according to the present invention comprises the release valve for releasing the brake fluid depending on the difference between the velocity of the wheel and the velocity of the automobile and the decompression cylinder, the braking operation is accomplished while the difference between the velocity of the wheel and the velocity of the automobile has the maximum deceleration when the brake is actuated, thereby preventing any slip due to lock of wheels of the automobile and minimizing a braking distance.

Claims

WHAT IS CLAIMED IS:
1. A brake system of an automobile comprising: a wheel velocity sensor (120) for sensing velocity of a wheel; an automobile velocity sensor (130) for sensing velocity of the automobile; a controller (110) for comparing the velocity inputted from said wheel velocity sensor (120) with the velocity from said automobile velocity sensor (130) and generating a control signal if the difference between the two velocities exceeds velocity difference by which maximum deceleration is generated; a release valve (200) controlled by said controller (110) for releasing oil pressure on a brake oil pressure line (530); and a decompression cylinder (300) for elastically filling brake fluid released from said release valve (200) to reduce said brake fluid to predetermined pressure.
2. The brake system as claimed in claim 1, wherein said depression cylinder (300) comprises a decompression control unit (313) screwed to control pressurizing pressure of a decompression spring 312 pressurizing a decompression plunger (311) for controlling decompressing pressure, and wherein said decompression control unit (313) comprises a control unit actuating member (320) controlled by said controller (110) for rotating said decompression control unit (313) in such a manner that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line (530).
3. The brake system as claimed in claim 1, wherein said release valve (200) is provided at the rear end thereof with means for changing brake pressure (400) so that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line (530) depending on the control of said controller (110), and wherein said means for changing brake pressure (400) comprises-' a connection line (411) connected with said brake oil pressure line (530); a variable pressure cylinder (412) having predetermined capacity to release and store the brake fluid of said brake oil pressure line (530) via said connection line (411); and a variable pressure plunger (413) received sliding movably in said variable pressure cylinder (412) and controlled by said controller (110) for releasing and pressurizing the brake fluid on said brake oil pressure line (530), said variable pressure plunger being capable of sliding by means of an actuator.
4. The brake system as claimed in claim 1, wherein said release valve (200) is provided at the rear end thereof with means for changing brake pressure (400) so that the difference between the wheel velocity and the automobile velocity has maximum deceleration by means of the oil pressure on said brake oil pressure line (530) depending on the control of said controller (110), and wherein said means for changing brake pressure (400) comprises: a connection line (411) connected with said brake oil pressure line (530); a variable pressure cylinder (412) having predetermined capacity to release and store the brake fluid of said brake oil pressure line (530) via said connection line (411); and a screw plunger (431) received sliding movably in said variable pressure cylinder (412) and controlled by said controller (110) for releasing and pressurizing the brake fluid on said brake oil pressure line (530), said screw plunger being capable of rotating by means of a plunger actuating member (432).
5. The brake system as claimed in claim 3, wherein said actuator is a screw shaft actuator (421) comprising a screw shaft (421a) and a driving motor (421b) attached to the rear end of said variable pressure plunger (413).
6. The brake system as claimed in claim 3, wherein said actuator is an oil and air pressure actuator (422) comprising a piston rod (422a) attached to the rear end of said variable pressure plunger (413), said oil and air pressure actuator being operated by means of oil pressure or air pressure.
7. The brake system as claimed in claim 3, wherein said actuator is a solenoid actuator (423) comprising an armature (423a) attached to the rear end of said variable pressure plunger (413).
8. The brake system as claimed in claim 1, further comprising a pressure sensor (140) for inputting a pressure signal to said controller (110) in such a manner that the operation of said means for changing brake pressure can be controlled accurately depending on the pressure of the brake fluid
PCT/KR2003/002404 2002-11-11 2003-11-10 A brake system of an automobile WO2004043755A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003276762A AU2003276762A1 (en) 2002-11-11 2003-11-10 A brake system of an automobile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020020069838A KR20040041469A (en) 2002-11-11 2002-11-11 A break system of an automobile
KR10-2002-0069838 2002-11-11

Publications (1)

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WO2004043755A1 true WO2004043755A1 (en) 2004-05-27

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Application Number Title Priority Date Filing Date
PCT/KR2003/002404 WO2004043755A1 (en) 2002-11-11 2003-11-10 A brake system of an automobile

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KR (1) KR20040041469A (en)
AU (1) AU2003276762A1 (en)
WO (1) WO2004043755A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826256A (en) * 1986-11-11 1989-05-02 Alfred Teves Gmbh Brake slip-controlled hydraulic brake system for vehicles
US4938543A (en) * 1989-05-17 1990-07-03 General Motors Corporation Anti-lock braking/traction control braking system
US5112117A (en) * 1990-02-13 1992-05-12 Robert Bosch Gmbh Vehicle brake system with anti-skid apparatus
US5362140A (en) * 1991-04-04 1994-11-08 Alfred Teves Gmbh Automotive vehicle brake system with brake-slip-dependent and traction-slip-dependent braking pressure control

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826256A (en) * 1986-11-11 1989-05-02 Alfred Teves Gmbh Brake slip-controlled hydraulic brake system for vehicles
US4938543A (en) * 1989-05-17 1990-07-03 General Motors Corporation Anti-lock braking/traction control braking system
US5112117A (en) * 1990-02-13 1992-05-12 Robert Bosch Gmbh Vehicle brake system with anti-skid apparatus
US5362140A (en) * 1991-04-04 1994-11-08 Alfred Teves Gmbh Automotive vehicle brake system with brake-slip-dependent and traction-slip-dependent braking pressure control

Also Published As

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AU2003276762A1 (en) 2004-06-03
KR20040041469A (en) 2004-05-17

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