KR101683852B1

KR101683852B1 - Hybrid brake system for vehicle

Info

Publication number: KR101683852B1
Application number: KR1020100061324A
Authority: KR
Inventors: 김종성
Original assignee: 현대모비스 주식회사
Priority date: 2010-06-28
Filing date: 2010-06-28
Publication date: 2016-12-20
Also published as: KR20120000839A

Abstract

The present invention relates to a hybrid braking device for a vehicle capable of sufficiently reducing the energy consumed in braking while improving the safety braking performance of the vehicle and improving the fuel consumption. The braking device transmits the braking force of the driver to the motor by an electric signal, A front wheel braking unit for generating a braking force by a motor driving force corresponding to the electrical signal and transmitting the braking force to the front wheels; And a control section for controlling the motor and a rear wheel braking section for generating a braking force only by the pedal force of the driver and transmitting the braking force to the rear wheels, A hydraulic braking device is provided on a rear wheel which requires a relatively low braking force and an advantage of minimizing the energy consumed in braking is not used because a booster device using negative pressure of the engine is not used have.

Description

[0001] The present invention relates to a hybrid brake system for vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for a vehicle, and more particularly, to a braking device for a vehicle using various braking methods in order to minimize energy consumption required for braking and ensure braking safety of the vehicle.

A braking device is a device that decelerates or stops the speed of a moving machine.

Particularly, a braking device for a vehicle is generally divided into a hydraulic braking device and an electric braking device.

A hydraulic braking device is a device that outputs a braking hydraulic pressure to a braking cylinder located at a front wheel and a rear wheel of a master cylinder after the power of a driver is extracted by a braking device and then transmitted to a master cylinder, Or by providing a friction force to the drum, thereby generating a braking force.

Such a hydraulic braking device has high braking force and good stability, but there are problems that the structure is complicated and the number of mounted parts increases in order to precisely control the braking hydraulic pressure.

On the other hand, an electric braking device refers to an electric braking device that analyzes a driver's treading force as an electrical signal, converts the driving force of the corresponding motor into a linear motion, and presses the friction material against a disk rotating together with the front wheel and the rear wheel, .

[0003] As electric vehicles and hybrid vehicles have become more popular, electric braking devices have been increasingly used as braking devices in place of hydraulic braking devices, and various types of electric braking devices have been proposed.

The electric braking system as described above has excellent characteristics in terms of braking efficiency due to its fast response characteristics. It is also used in automobile electronic systems such as ABS (Anti-lock Bbrake System), TCS (Traction Control System) and ESP (Electronic Stability Process) There is an advantage that connection is easy.

In a vehicle, such a braking device is a very important component associated with the life of the driver, and the stability of the braking device must be given first of all.

At the same time, braking efficiency is also very important. As the engine technology develops, the kinetic energy of the vehicle increases and accordingly, the energy consumed in the process of braking the vehicle is consumed. In consideration of the automobile industry, which considers fuel consumption efficiency increasingly, .

Therefore, a vehicle braking device capable of maximizing the braking efficiency and minimizing the energy consumption required for braking is desperately needed, while ensuring the stability of the braking performance of the vehicle.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle braking device capable of improving fuel economy by minimizing energy consumed in braking while sufficiently ensuring safe braking performance of the vehicle. .

According to an aspect of the present invention to achieve the above object, there is provided a vehicular drive system for a vehicle, comprising: a driver that transmits a stepping force to an electric signal by an electric signal, generates a first braking force by a motor driving force corresponding to the electric signal, A rear wheel braking unit that generates a second braking force by providing a braking hydraulic pressure only by the driver's stepping force and transmits the second braking force to the rear wheels; And a control unit for controlling the motor.

At this time, the rear wheel braking unit may include a master cylinder directly connected to the pedal to receive the pedal force of the driver as it is and provide the braking hydraulic pressure to the rear wheel caliper.

The braking hydraulic pressure compensating unit may further include a braking hydraulic pressure supplementing the braking hydraulic pressure when an error detection signal is input from the sensor group installed in the front wheel.

At this time, the braking hydraulic pressure compensator includes an accumulator connected to the rear wheel caliper and filled with a braking fluid, a pump connected to the accumulator for adding braking hydraulic pressure to the rear wheel caliper, and a pump connected between the rear wheel caliper and the accumulator And a control valve provided on the connection line of the control line for opening or closing the connection line, wherein the control unit controls on / off of the pump and opening and closing of the control valve.

The front wheel braking section is preferably provided between the motor and the braking target and generates braking force through a pressing member having a wedge shape so as to have a magnetic force.

The hybrid braking device for a vehicle according to the present invention is characterized in that a motor braking device is provided on a front wheel requiring a high braking force and a hydraulic braking device is provided on a rear wheel requiring a relatively low braking force, It is advantageous to minimize the energy consumed in braking.

Further, there is an advantage that the braking hydraulic pressure compensating section for supplementing the braking hydraulic pressure of the rear wheel is further provided, thereby further enhancing the braking safety of the vehicle.

Fig. 1 is a conceptual diagram for explaining an embodiment of a hybrid braking system for a vehicle according to the present invention.
2 is a conceptual diagram for explaining an embodiment of a hybrid braking device for a vehicle according to the present invention in which a booster is removed.
3 is a conceptual diagram for explaining a braking hydraulic pressure compensator constructed in an embodiment of the hybrid braking system for a vehicle according to the present invention.
Fig. 4 is a conceptual diagram for explaining the configuration of the braking hydraulic pressure supplement unit shown in Fig. 3. Fig.
5 is a conceptual diagram showing a state in which the braking hydraulic pressure is supplementarily supplied by the braking hydraulic pressure supplementing unit shown in Fig.

A preferred embodiment of the hybrid braking system for a vehicle according to the present invention will be described below.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings.

It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein; It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Before describing the hybrid braking system 100 for a vehicle according to the present invention, the characteristics of the front and rear wheels of the vehicle at the time of braking will be briefly described.

Generally, since the center of the vehicle is higher than the road surface, a rotational moment is generated forward at the same time when the vehicle is running. As a result, the load on the front wheels increases and the load on the rear wheels decreases.

Even if the same braking pressure is applied to the front wheel and the rear wheel due to such load transmission, the slip of the rear wheel becomes larger than the front wheel due to the difference of the road surface and the contact force between the front wheel and the rear wheel.

Generally, in order to solve such a problem, the ratio of the braking force of the front wheel to the braking force of the rear wheel is adjusted to secure the steering property and braking stability in braking.

Generally, a great deal of braking force is required for the front wheels for the safety and braking efficiency of the vehicle.

An electric braking device having excellent braking performance is provided on a front wheel requiring high braking force based on the braking force distribution structure of the front wheel and a rear wheel of the present invention. The rear wheel, which requires a relatively low braking force, is operated only by a driver's stepping force A hydraulic braking device is mounted on the vehicle.

FIG. 1 is a conceptual diagram for explaining an embodiment of a hybrid braking system for a vehicle according to the present invention, and FIG. 2 is a schematic view for explaining an embodiment of a hybrid braking system for a vehicle according to the present invention, FIG.

FIG. 1 and FIG. 2 illustrate only portions that are conceptually clarified in order to clearly understand the constitution of the preferred embodiment of the present invention. As a result, various modifications of the illustrations are expected. Need not be limited.

Referring to FIG. 1, a hybrid braking system 100 for a vehicle includes a front wheel braking unit 110, a rear wheel braking unit 120, and a controller 140.

First, the front wheel braking unit 110 will be described.

1, the front wheel braking unit 110 is provided between the front wheel F and the pedal P of the vehicle, generates a braking force by switching the driving force of the motor, and transmits a braking force to the front wheel F It is the role of

Specifically, the front wheel braking unit 110 detects the displacement of the pedal generated by the pedal force of the driver from a displacement sensor provided on the pedal, converts the detected displacement into an electric signal, and outputs it to an ECU (Electric Control Unit) The control unit 140 applies an operation signal corresponding to the electric signal to the motor M connected to the friction pads of the front wheels and transmits the rotational force of the motor M to the control unit 140, A frictional force is applied to a disk rotating together with the front wheel F to generate a braking force and to transmit the braking force to the front wheel F. [

The braking device having the above configuration is referred to as an electric braking device as described above.

The pressing structure of the friction pads of the present invention can be implemented as various forms of embodiments to provide frictional force, for example, by pressing one side, both sides, or the circumferential surface of the disk to generate a frictional force for braking , And the mechanical structure for converting the rotational force of the motor M into the linear motion can be variously formed in consideration of the shape of the body, the running condition, the braking efficiency, and the like.

Since the response speed of the front wheel braking unit 110 having an electrical configuration is very fast, the braking distance can be shortened, as well as the smooth braking operation can be performed even on a beating road or an ice sheet, It is environmentally friendly and has the characteristic of saving energy.

Further, by constructing the front wheel braking section 110 electrically, it is possible to remove a booster and a hydraulic line, which will be described later, which are provided in the vicinity of the front wheel of the existing vehicle, to effectively utilize the front wheel space section having an important position in the vehicle .

However, in order to supply the braking force as much as that provided by the conventional hydraulic braking device, there is a problem that a high-output motor must be provided. However, in the front wheel braking part 110 of this embodiment, a wedge- By including the pressing member, energy consumption required for braking is minimized.

Here, self reinforcement means that the rotational energy of the disk is used as an energy required for braking to increase the braking force. As a result, due to the wedge-shaped structure having the braking surface and the inclined surface, Force is added to the braking force.

Generally, a wedge-shaped pressing member is provided between the motor and the friction pad, and has an inclined surface to be inclined with respect to the braking surface. Such a pressing member may be variously formed corresponding to the shape of the dynamic mechanical means for converting the rotational force of the motor into the linear motion, the shape of the inclined surface, and the like.

Next, the rear wheel braking unit 120 will be described.

1 and 2, the front wheel braking unit 110 is provided between the rear wheel R and the pedal P of the vehicle so as to directly convert the driver's treading force into braking hydraulic pressure, To a braking cylinder (not shown) in the caliper 122 installed in the rear wheel F to generate a braking force and to transmit the braking force to the rear wheel F. [

Specifically, the driver's tread force is transmitted from the pedal P to the master cylinder 121, and the braking hydraulic pressure in the master cylinder 121 is transmitted to the rear wheel F along the hydraulic line installed in the caliper 122 The braking force is generated and the braking force is transmitted to the rear wheel R. The braking force is transmitted to the braking cylinder and the frictional pad is pressed against the disk or the drum rotating together with the front wheel F to provide the frictional force.

As shown in FIG. 2, the rear wheel brake unit 120 removes a booster such as a booster located at A in FIG. 2, and the pedal P and the master cylinder 121 are connected to the pushrod C ). &Lt; / RTI >

Therefore, the rear wheel R is braked only by the driver's depressing force.

Here, the booster is a device for adjusting the force applied to the master cylinder 121 when the pedal P is stepped on by using the negative pressure of the vehicle engine, and is a device capable of obtaining a great braking force even with small stepping force of the driver .

Generally, the booster booster of the vehicle is divided into a front-rear space by a diaphragm inside the cylindrical housing, and a front space is communicated with an intake manifold of the engine or communicated with a separate pump, and is formed in a vacuum state when necessary.

And a force generated due to the difference between the vacuum state of the front space and the atmospheric pressure of the rear space is transmitted to the master cylinder 121.

However, since such a booster booster is performed using a negative pressure of the intake manifold of the engine or a separate pump, energy consumption occurs at rest.

In this embodiment, the hydraulic braking device is mounted on a rear wheel which requires a low braking force, so that the booster such as the booster is removed to minimize the energy generated during braking.

Therefore, the rear wheel braking unit 120 of the present embodiment has a configuration capable of increasing the fuel economy of the entire vehicle.

Further, by removing the booster having a relatively large volume and removing the piping accordingly, it becomes possible to efficiently utilize the front wheel space portion having an important position in the vehicle.

Unlike the above-described front wheel F, the rear wheel R is provided with a separate rear wheel braking portion 120 having a hydraulic braking structure as described above, so that the braking force is imparted to the rear wheel R The stability of the entire vehicle can be further enhanced.

This will be described in detail together with the braking hydraulic pressure compensating unit 130 to be described later.

Since the rear wheel braking unit 120 transmits the braking hydraulic pressure to the rear wheel having a low braking force distribution specific gravity without stepping on the driver's stepping force, in the ECU or the HECU, from the viewpoint of braking force distribution of the entire vehicle, It is preferable to set the operation reference value of the front wheel braking unit 110 in consideration of the braking unit 120 and to control the motor.

Next, the braking hydraulic pressure supplementing unit 130 will be described.

3 is a conceptual diagram for explaining a braking hydraulic pressure compensator constructed in an embodiment of the hybrid braking system for a vehicle according to the present invention.

The braking hydraulic pressure supplement unit 130 plays a role of adding a braking force to the rear wheel R in addition to the braking force by the driver's foot force in addition to the front wheel braking unit 110 described above.

The braking hydraulic pressure compensating unit 130 determines that there is a problem in the braking performance of the front wheel braking unit 110 when the error detection signal is inputted from the sensor group S provided on the front wheel F, P, the braking hydraulic pressure is supplied to the braking cylinder in the caliper 122 of each rear wheel to provide the braking force required by the vehicle.

Here, the sensor group S refers to the rotational speed, rotational position and braking pressure (hereinafter, referred to as front wheel operation data) of the front wheel F and the displacement of the mechanisms for linear motion corresponding to the rotation of the motor, (Hereinafter, referred to as operation data of the motor) of a pressing member and the like.

The error detection signal is an error detection signal that is generated by using the operation data of the front wheel received from the sensors and the operation data of the motor and the reference output value corresponding to the input data (torque of the motor, rotation angle displacement, etc.) (A reference value of the operation data of the front wheels and a reference value of the operation data of the motors) and an error out of the tolerance occurs.

The braking hydraulic pressure supplementing unit 130 supplies the braking hydraulic pressure in a complementary manner when the above-described error detection signal is inputted and an operation signal is received from the control unit 140. [

Fig. 4 is a conceptual diagram for explaining the configuration of the braking hydraulic pressure supplement unit shown in Fig. 3, Fig. 5 is a conceptual view showing a state in which the braking hydraulic pressure is supplementarily supplied by the braking hydraulic pressure supplement unit shown in Fig. to be.

As shown in FIGS. 4 and 5, the braking hydraulic pressure supplement unit 130 preferably includes an accumulator 131, a pump 132, and a control valve 133.

4 and 5 show only a part that is conceptually clarified in order to clearly understand the constitutional relationship of the preferred embodiment of the present invention. In the drawings, the various parts arranged in the hydraulic line connected to the rear wheel braking part 120 described above The known solenoid valves and sensors are omitted, and the present invention is not necessarily limited to the particular type shown.

The accumulator 131 is a tank filled with a braking fluid at a predetermined initial pressure. In the case shown in Figs. 4 and 5, the accumulator 131 is a spring type in which an elastic member is provided, a bladder type in which a bladder is installed may be used.

The accumulator 131 is connected to the braking cylinder of the rear wheel caliper 122 by a hydraulic line.

The pump 132 is connected to the accumulator 131 and the rear wheel caliper 122 to add a driving force to the rear wheel caliper 122 so that the brake fluid can be fed.

The control valve 133 is installed on a hydraulic line located between the rear wheel caliper 122 and the accumulator 131 and serves to open or shut off the hydraulic line.

The control valve 133 is constituted by an electric solenoid valve and corresponds to an electrical signal of the control unit 140 to be described later.

The operation state of the braking hydraulic pressure supplement unit 130 having such a structure will be described with reference to FIG.

The on / off of the pump 132 and the opening and closing of the control valve 133 are controlled by a control unit 140 to be described later.

That is, when the control valve 133 blocks the hydraulic line located between the rear wheel caliper 122 and the accumulator 131 in the OFF state, The ECU 100 determines the validity of the error detection signal. If it is determined that the emergency is detected, the control valve 133 is first turned on to open the corresponding hydraulic line.

The control unit 140 then supplies the braking fluid to the rear wheel caliper 122 by forcibly feeding the braking fluid to the rear wheel caliper 122 by driving the pump 132. [

Thus, in the hybrid braking system for a vehicle according to the present invention, when a problem occurs in the front wheel (F) braking due to an electrical error, driving software, or a hardware error such as a motor, the rear wheel R ) By supplementing the braking force and adding additional braking force, the safety of the vehicle can be greatly improved.

Next, the control unit 140 will be described.

The control unit 140 controls the motor M of the front wheel braking unit 110 in response to the positional displacement information of the pedal P to control the braking force of the front wheel F in accordance with the state of the vehicle do.

If it is determined that the error detection signal transmitted from the sensor group S is valid and the emergency braking force is generated by the front wheel braking unit 110, the braking hydraulic pressure compensating unit 130 In response to the operation signal.

The control unit 140 is a component of a general concept including each ECU (Electric Control Unit) or HECU (Hydraulic Electric Control Unit) installed in the vehicle,

By analyzing the data transmitted from the displacement sensors installed on the pedal P to determine the driver's braking will and controlling the braking force by controlling the motor M, .

The preferred embodiments of the hybrid braking system for a vehicle according to the present invention have been described above.

It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

110: front wheel braking part 120: rear wheel braking part
121: master cylinder 122: rear wheel caliper
130: Braking hydraulic pressure supplement unit 131: Accumulator
132: Pump 133: Control valve
140:

Claims

A front wheel braking unit that transmits a driver's stepping force to an electric signal by an electric signal, generates a first braking force by a motor driving force corresponding to the electric signal, and transmits the first braking force to a front wheel;
A rear wheel braking section for generating a second braking force by transmitting the braking hydraulic pressure only by the driver's foot pressure and transmitting the second braking force to the rear wheels;
And a control unit for controlling the motor,
The front-
And a pressing member which is provided between the motor and the braking object and has a wedge shape so as to have a magnetic force, wherein the braking force is generated through the pressing member,
The rear-
And a master cylinder directly connected to the pedal to directly receive the driver's tread force and to provide braking hydraulic pressure to the rear wheel caliper
And the pedal and the master cylinder are directly connected to the push rod.

delete

The method according to claim 1,
Further comprising a braking hydraulic pressure compensating unit that compensates the braking hydraulic pressure to the rear wheel when an error detection signal is inputted from the sensor group installed in the front wheel.

The method of claim 3,
The braking hydraulic pressure compensator,
An accumulator connected to the rear wheel caliper and filled with a braking fluid;
A pump connected to the accumulator for adding braking hydraulic pressure to the rear wheel caliper;
And a control valve installed on a connection line between the rear wheel caliper and the accumulator for opening or closing the connection line,
Wherein the control unit controls ON / OFF of the pump and opening / closing of the control valve.

delete