KR102061908B1 - Electronic hydraulic brake device - Google Patents

Abstract

The present invention relates to an electronic hydraulic brake device, a pedal cylinder for generating hydraulic pressure by pressing the pedal, a master cylinder for generating a hydraulic pressure by detecting the pedal, the main chamber and the auxiliary chamber and the additional chamber is formed; A storage unit for storing the fluid, an auxiliary channel unit having both ends communicating with the storage unit and the auxiliary chamber, an integrated channel unit connected to the storage unit, the pedal cylinder unit, the main chamber, and the additional chamber to control the movement of the fluid; The hydraulic circuit is simplified and the braking response is improved, including an auxiliary wheel cylinder portion in communication with the chamber and providing a braking force, and a main wheel cylinder portion in communication with the main chamber and providing a braking force.

Description

Electronic hydraulic brake device {ELECTRONIC HYDRAULIC BRAKE DEVICE}

The present invention relates to an electronic hydraulic brake device, and more particularly, to an electronic hydraulic brake device in which a chamber is further formed in the master cylinder, thereby improving responsiveness.

In general, the electronic hydraulic brake device is to adjust the braking pressure of each wheel by the hydraulic pressure of the master cylinder driven by the motor after the pedal pressure of the driver is detected by the sensor.

The electronic hydraulic brake device includes a sensor that detects the stroke of the pedal so that the driver knows the desired braking pressure.

The electronic hydraulic brake device also includes a pedal travel simulator that allows the driver to feel the same pedal pressure as in a normal hydraulic brake device.

Therefore, when the driver presses the brake pedal, the electronic control unit detects this and supplies hydraulic pressure to the master cylinder.

Then, the master cylinder delivers the braking hydraulic pressure to the wheel cylinder of each wheel, to provide a braking force to each wheel.

On the other hand, the background of the present invention is disclosed in Republic of Korea Patent Publication No. 2007-0104982 (published October 30, 2007, the name of the invention: the valve control device of the electronic hydraulic brake device).

In the conventional electronic hydraulic brake device, the master cylinder is divided into two chambers, the main piston and the main spring, the sub piston and the sub spring are sequentially arranged, and the main piston is moved by the motor.

When the master cylinder is controlled from a high pressure to a low pressure and then controlled again with a high pressure, the main piston is controlled by the motor, but the sub piston is not controlled by the motor, which causes a problem in that the response is degraded.

Therefore, there is a need for improvement.

The present invention has been made to solve the above problems, an object of the present invention is to provide an electronic hydraulic brake device that improves responsiveness by adding a chamber to the master cylinder and improving the flow path.

An electronic hydraulic brake apparatus according to the present invention includes: a pedal cylinder unit configured to generate hydraulic pressure by pressurizing a pedal; A master cylinder unit configured to generate the hydraulic pressure by sensing the pedal and to form a main chamber, an auxiliary chamber, and an additional chamber; A storage unit for storing the fluid; An auxiliary channel unit having both ends communicating with the storage unit and the auxiliary chamber; An integrated flow path unit connected to the storage unit, the pedal cylinder unit, the main chamber, and the additional chamber to control the movement of the fluid; An auxiliary wheel cylinder in communication with the auxiliary chamber and providing a braking force; And it is in communication with the main chamber, characterized in that it comprises a main wheel cylinder for providing a braking force.

The pedal cylinder unit: a pedal housing which is open at one side; A pedal rod connected to the pedal and inserted into the pedal housing; A pedal piston coupled to the pedal rod and formed in the pedal housing to form a pedal chamber, the pedal piston being amplified by the pedal and amplifying the hydraulic pressure stored in the pedal chamber; And a pedal spring embedded in the pedal housing and supporting the pedal piston.

The master cylinder portion: a drive housing to which the drive motor is mounted; A master housing communicating with one side of the driving housing; An additional housing part connected to the other side of the driving housing part and in which the additional chamber is formed; And a hydraulic pressure control unit mounted on the driving motor, and configured to adjust the hydraulic pressure of the master housing part and the additional housing part while being moved left and right according to the rotational direction of the drive motor.

The hydraulic control unit: a drive rod mounted on the drive motor to move; A main piston coupled to one end of the driving rod and inserted into the master housing; An auxiliary piston embedded in the master housing and spaced apart from the main piston; A juice spring disposed between the main piston and the auxiliary piston to elastically support the main piston; An auxiliary spring embedded in the master housing and elastically supporting the auxiliary piston; And an additional piston coupled to the other end of the driving rod and adjusting the volume of the additional chamber, wherein the auxiliary piston divides an internal space of the master housing into the main chamber and the auxiliary chamber, wherein the main chamber Is disposed between the main piston and the auxiliary piston.

The integrated channel unit may include: a first channel connecting the pedal cylinder unit and the first integrated valve to guide the fluid; A second passage connecting the first passage and the second integration valve to guide the fluid; A third flow passage connecting the second integration valve and the third integration valve to guide the fluid; A fourth passage extending from the third passage and connected to the additional housing; A pedal passage configured to guide the fluid by connecting the storage unit and the pedal cylinder unit; And a master flow path connecting the master housing part and the third integrated valve to guide the fluid and communicating with the pedal flow path.

The second flow path is characterized in that it comprises a pedal pressure sensor for measuring the pedal pressure of the pedal by measuring the hydraulic pressure.

The electronic hydraulic brake apparatus according to the present invention has the effect of reducing the energy of the drive motor since the drive rod is moved by the drive motor and the hydraulic pressure in accordance with the pedal stroke of the driver.

The electronic hydraulic brake apparatus according to the present invention has an effect of improving braking response and improving braking performance.

The electronic hydraulic brake apparatus according to the present invention has an effect of reducing the stroke detection error of the pedal by measuring the hydraulic pressure of the pedal pressure sensor is increased or decreased by the pedal.

1 is a view schematically showing an electronic hydraulic brake device according to an embodiment of the present invention.
2 is a view schematically showing the flow of the fluid by the drive of the motor when the pedal in the electronic hydraulic brake device according to an embodiment of the present invention.
3 is a view schematically showing the fluid flow by the driving of the motor and the pedal effort when the pedal in the electronic hydraulic brake device according to an embodiment of the present invention.
4 is a view schematically showing a fluid flow in a reduced pressure state in the electronic hydraulic brake device according to an embodiment of the present invention.
5 is a view schematically showing the flow of the fluid when the system is bad in the electronic hydraulic brake device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the electronic hydraulic brake apparatus according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a view schematically showing an electronic hydraulic brake device according to an embodiment of the present invention, Figure 2 is a flow of fluid by the drive of the motor when the pedal pressure in the electronic hydraulic brake device according to an embodiment of the present invention. 3 is a view schematically showing the fluid flow by the driving of the motor and the pedal effort when the pedal pressure in the electronic hydraulic brake device according to an embodiment of the present invention.

4 is a view schematically showing a fluid flow in a pressure-reduced state in the electronic hydraulic brake device according to an embodiment of the present invention, Figure 5 is when the system is bad in the electronic hydraulic brake device according to an embodiment of the present invention A diagram schematically showing the flow of fluid.

1 to 6, the electronic hydraulic brake device 1 according to an embodiment of the present invention includes a pedal cylinder unit 10, a master cylinder unit 20, a storage unit 30, and an auxiliary flow path. The unit 40, the integrated flow path unit 50, the auxiliary wheel cylinder unit 60 and the main wheel cylinder unit 70 is included.

The pedal cylinder 10 generates hydraulic pressure by the pressure of the pedal 100. The pedal cylinder portion 10 forms one pedal chamber 15.

In the present embodiment, the pedal cylinder unit 10 includes a pedal housing 11, a pedal rod 12, a pedal piston 13, and a pedal spring 14.

The pedal housing 11 is open at one side (right side of FIG. 1), and the pedal rod 12 is connected to the pedal 100 to be inserted into the opened portion of the pedal housing 11.

The pedal piston 13 is coupled to the pedal rod 12 to be in close contact with the inside of the pedal housing 11, and the pedal spring 14 is embedded in the pedal housing 11 to support the pedal piston 13.

At this time, the space enclosed by the pedal housing 11 and the pedal piston 13 becomes the pedal chamber 15.

Therefore, when the driver steps on the pedal 100, the pedal piston 13 coupled to the pedal rod 12 is moved from the right side to the left side of the pedal housing 11, so that the pressure of the fluid stored in the pedal chamber 15 increases. (See FIG. 1).

The master cylinder 20 detects the pedal 100 to generate hydraulic pressure. The master cylinder portion 20 forms a main chamber 201, an auxiliary chamber 202, and an additional chamber 203.

In the present embodiment, the master cylinder portion 20 includes a drive housing portion 21, a master housing portion 22, an additional housing portion 23, and a hydraulic control portion 24.

A drive motor 211 is mounted to the drive housing 21, and the rotation speed, the rotation direction, and the like of the ball screw 212 are changed by the drive motor 211. The drive housing 21 has a shape in which both sides are opened.

At this time, the rotation direction of the ball screw 212 is changed in a limited state, this configuration is used for a general braking device, so a detailed description thereof will be omitted.

The driving motor 211 is driven by sensing the pressure of the pedal 100. For example, a pedal sensor (not shown) detects whether the pedal 100 is pressed, and a controller (not shown) that receives the detection signal controls the rotation direction and the rotation speed of the driving motor 211.

The master housing portion 22 has a cylindrical shape in which fluid is embedded, and communicates with one side of the driving housing portion 21.

For example, the master housing portion 22 is coupled to the driving housing portion 21 so that the right side surface of FIG. 1 is opened to communicate with the left opening portion of the driving housing portion 21.

The additional housing part 23 is connected to the other side of the driving housing part 21. An additional chamber 203 is formed in the additional housing 23.

For example, the additional housing 23 is coupled to the additional cover 231 and the additional cover 231 coupled to the right side of the drive housing 21 to cover the right opening of the drive housing 21. And includes an additional tube 232 extending to the right side. At this time, the additional tube 232 is an additional chamber 203 in the inner space.

The hydraulic control unit 24 includes a drive rod 241, a main piston 242, an auxiliary piston 243, a juice spring 244, an auxiliary spring 245, and an additional piston 246. .

The driving rod 241 is mounted to the driving motor 211. For example, the driving rod 241 is coupled to the ball screw 212 rotated by the drive motor 211, and is moved left and right according to the rotation direction of the ball screw 212.

The left end of the driving rod 241 is inserted into the master housing 22, and the right end of the driving rod 241 is inserted into the additional pipe 232 through the additional cover 231.

The main piston 242 is coupled to the left end of the driving rod 241 and inserted into the master housing 22. The main piston 242 is moved inside the master housing 22 as the driving motor 211 is driven to adjust the pressure of the fluid stored in the master housing 22.

The auxiliary piston 243 is embedded in the master housing 22 and spaced apart from the main piston 242. The auxiliary piston 243 partitions the inner space of the master housing 22.

The juice spring 244 is disposed between the main piston 242 and the auxiliary piston 243 to elastically support the main piston 242, and the auxiliary spring 245 is embedded in the master housing 22 to support the auxiliary piston 243. ) Elastic support.

The auxiliary piston 243 divides the internal space of the master housing part 22 into the main chamber 201 and the auxiliary chamber 202. At this time, the space between the main piston 242 and the auxiliary piston 243 is the main chamber 201, the space between the left end of the auxiliary piston 243 and the master housing 22 is the secondary chamber (202). do.

The additional piston 246 is coupled to the right end of the driving rod 241, and is embedded in the additional housing 23. For example, the additional piston 246 is embedded in the additional tube 232 and adjusts the volume of the additional chamber 203 to vary the pressure of the fluid stored in the additional tube 232.

For example, the additional chamber 203 is formed on the right side of the additional piston 246, and the volume of the additional chamber 203 increases as the driving rod 241 is moved to the left side.

The storage unit 30 forms a space in which the fluid is temporarily stored, and buffers hydraulic pressure generated by the electronic hydraulic brake device 1. Auxiliary flow path part 40 is connected to both ends of the storage part 30 and the auxiliary chamber 202 of the master cylinder part 20 to guide the fluid.

The integrated flow path unit 50 is connected to the storage unit 30, the pedal cylinder unit 10, the main chamber 201 and the additional chamber 203 to control the movement of the fluid. That is, the integrated flow path unit 50 adjusts the oil pressure supplied to the main chamber 201 or the oil pressure supplied to the additional chamber 203 according to the braking state.

The auxiliary wheel cylinder 60 is connected to the master housing 22 so as to communicate with the auxiliary chamber 202, and provides a braking force to the wheel.

The main wheel cylinder 70 is connected to the master housing 22 so as to communicate with the main chamber 201, and provides a braking force to the wheel.

For example, the wheel is generally composed of four, divided into the front wheel right wheel (FR) and the front wheel left wheel (FL), rear wheel right wheel (RR) and rear wheel left wheel (RL).

The front wheel left wheel FL, the rear wheel right wheel RR, the rear wheel left wheel RL, and the front wheel right wheel FR are sequentially arranged from left to right in FIG.

The auxiliary wheel cylinder 60 provides braking force to the front wheel left wheel FL and the rear wheel right wheel RR, respectively, and the main wheel cylinder 70 provides the rear wheel left wheel RL and the front wheel right wheel FR. Provide braking power to each.

Integrated channel unit 50 according to an embodiment of the present invention is the first channel 51, the second channel 52, the third channel 53, the fourth channel 54, the pedal channel ( 55 and a master flow path 56.

One end of the first passage 51 is connected to the pedal cylinder portion 10, and the other end of the first passage 51 is connected to the first integration valve 301.

The first passage 51 guides the fluid stored in the pedal chamber 15. In this case, the stepping force providing unit 80 connected to the first integrated valve 301 provides a stepping force to the pedal 100.

One end of the second passage 52 is connected to the first passage 51, and the other end of the second passage 52 is connected to guide the fluid.

One end of the third passage 53 is connected to the second integration valve 302, and the other end of the third passage 53 is connected to the third integration valve 303 to guide the fluid.

The first integrated valve 301, the second integrated valve 302, and the third integrated valve 303 open and close the flow path under the control of the controller.

The fourth passage 54 extends from the third passage 53 and is connected to the additional housing 23. The fourth passage 54 communicates with the additional chamber 203 to guide the fluid stored in the additional chamber 203.

One end of the pedal flow path 55 is connected to the storage part 30, and the other end of the pedal path 55 is connected to guide the fluid.

The master flow path 56 has one end connected to the master housing part 22 and the other end connected to the third integrated valve 303 to guide the fluid. The master flow path 56 communicates with the pedal flow path 55 and communicates with the main chamber 201.

In this case, the second flow passage 52 includes a pedal pressure sensor 521. The pedal pressure sensor 521 measures the pressure of the fluid passing through the second passage 52, and measures the pedal force of the pedal 100.

The value measured by the pedal pressure sensor 521 may be used for controlling the driving motor 211 or for controlling the braking pressure of the auxiliary wheel cylinder 60 or the main wheel cylinder 70.

In the electronic hydraulic brake device 1 according to an embodiment of the present invention having the structure as described above, the flow of the fluid by driving the motor when the pedal is pressed is as follows (see FIG. 2).

When the driver presses the pedal 100, the fluid stored in the pedal chamber 15 passes through the first integrated valve 301 to reach the stepping force providing unit 80, and the stepping force providing unit 80 reaches the pedal 100. Provide the answer.

On the other hand, when the driver presses the pedal 100, the drive motor 211 is driven to drive the drive rod 241 to the left.

When the driving rod 241 is moved to the left, the main piston 242 and the auxiliary piston 242 is moved to the left, the fluid of the main chamber 201 is supplied to the main wheel cylinder 70, the auxiliary chamber 202 ) Fluid is supplied to the auxiliary wheel cylinder (60).

At this time, as the driving rod 241 is moved to the left side, the volume of the additional chamber 203 increases, and the third integration valve 303 is opened to fill the additional chamber 203 with the fluid stored in the storage unit 30. .

As such, in the normal state of the electromagnetic hydraulic brake device 1, the low pressure braking is generated only by the driving of the driving motor 211.

Referring to the flow of the fluid by the driving of the motor and the pedal effort when the pedal pressure in the electronic hydraulic brake device 1 according to an embodiment of the present invention having the structure as described above (see Figure 3).

In the state of FIG. 2, when the stroke of the pedal 100 increases, such as an emergency brake, additional liquid amount is required, the second integrated valve 302 is closed and the third integrated valve 303 is opened.

In addition, the pressure of the fluid stored in the pedal chamber 15 is further increased to sequentially pass through the first passage 51, the second passage 52, the third passage 53, and the fourth passage 54. Is supplied to the additional chamber 203.

By the hydraulic pressure supplied to the additional chamber 203, the driving rod 241 is moved to the left to press the main piston 242 and the auxiliary piston 243.

Such a fluid flow may reduce the energy of the driving motor 211 by converting the pedal effort of the driver into the main force.

Referring to the fluid flow in the pressure-reduced state in the electronic hydraulic brake device 1 according to an embodiment of the present invention is as follows (see Fig. 4).

At this time, the fluid flow in the pressure-reduced state is when the driver requires the regenerative braking cooperative control or ABS or ABS (ESC) function in the state of pressing the pedal 100, the auxiliary wheel cylinder unit 60 and This means that the fluid is moved so that the braking pressure to the main wheel cylinder portion 70 instantaneously decreases.

In the pressure-reduced state, the hydraulic pressure of the master cylinder portion 20 is reduced regardless of the stroke of the pedal 100. To this end, the first integrated valve 301 is opened and the third integrated valve 303 is opened.

In the above state, the driving motor 211 is rotated in the reverse direction, the driving rod 241 is moved to the right, and the fluid stored in the additional chamber 203 is moved to the storage unit 30 to move the driving rod 241. It does not limit

Referring to the flow of the fluid when the system is bad in the electronic hydraulic brake device 1 according to an embodiment of the present invention is as follows (see Fig. 5).

The system failure means damage to electronic components included in the electronic hydraulic brake device 1 and driven by an electrical signal, and in the case of a system failure, power supply to the electronic hydraulic brake device 1 is cut off.

When the power supply to the electromagnetic hydraulic brake device 1 is cut off, the first integrated valve 301 is closed, the second integrated valve 302 is opened, and the third integrated valve 303 is closed.

In the above state, when the driver presses the pedal 100, the fluid in the pedal chamber 15 passes through the first passage 51, the second passage 52, the third passage 53, and the fourth passage 54. It passes sequentially and is supplied to the additional chamber 203.

By the hydraulic pressure supplied to the additional chamber 203, the driving rod 241 is moved to the left to press the main piston 242 and the auxiliary piston 243.

In the electronic hydraulic brake device 1 according to the exemplary embodiment of the present invention, the driving rod 241 is moved by the driving motor 211 and the hydraulic pressure according to the stroke of the pedal 100 of the driver, and thus the energy of the driving motor 211. Can reduce the cost.

Electronic hydraulic brake device 1 according to an embodiment of the present invention can improve the braking response can improve the braking performance.

The electronic hydraulic brake apparatus 1 according to an embodiment of the present invention may suppress the stroke detection error of the pedal 100 by measuring the hydraulic pressure of the pedal pressure sensor 521 increased or decreased by the pedal 100.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: pedal cylinder portion 11: pedal housing
12: Pedal Rod 13: Pedal Piston
14: pedal spring 20: master cylinder
21: drive housing 22: master housing
23: additional housing 30: storage unit
40: auxiliary euro part 50: integrated euro part
51: first euro 52: second euro
53: third euro 54: fourth euro
60: auxiliary wheel cylinder 70: main wheel cylinder
80: power supply unit 100: pedal
201: main chamber 202: auxiliary chamber
203: additional chamber 211: drive motor
212: Ball screw 231: Additional cover
232: additional tube 241: driving rod
242: Jupiter 243: Secondary piston
244: juice spring 245: auxiliary spring
246: additional piston 301: first integrated valve
302: second integrated valve 303: third integrated valve
521: Pedal Pressure Sensor

Claims (6)

A pedal cylinder unit configured to generate hydraulic pressure by pressurizing the pedal;
A master cylinder unit configured to generate the hydraulic pressure by sensing the pedal and to form a main chamber, an auxiliary chamber, and an additional chamber;
A storage unit for storing the fluid;
An auxiliary channel unit having both ends communicating with the storage unit and the auxiliary chamber;
An integrated flow path unit connected to the storage unit, the pedal cylinder unit, the main chamber, and the additional chamber to control the movement of the fluid;
An auxiliary wheel cylinder in communication with the auxiliary chamber and providing a braking force; And
A main wheel cylinder in communication with the main chamber and providing a braking force,
The master cylinder portion
A drive housing in which a drive motor is mounted;
A master housing communicating with one side of the driving housing;
An additional housing connected to the other side of the driving housing and in which the additional chamber is formed; And
And an oil pressure control unit mounted to the drive motor, the oil pressure adjusting unit adjusting the oil pressure of the master housing unit and the additional housing unit while moving from side to side according to the rotational direction of the drive motor.
The method of claim 1, wherein the pedal cylinder portion
A pedal housing having one side opened;
A pedal rod connected to the pedal and inserted into the pedal housing;
A pedal piston coupled to the pedal rod and built into the pedal housing to form a pedal chamber, the pedal piston being amplified by the pedal and amplifying the hydraulic pressure stored in the pedal chamber; And
An electric hydraulic brake device, characterized in that the pedal housing is built in the pedal housing, the pedal spring for supporting the pedal piston.
delete According to claim 1, wherein the hydraulic pressure control unit
A drive rod mounted on the drive motor and moved;
A main piston coupled to one end of the driving rod and inserted into the master housing;
An auxiliary piston embedded in the master housing and spaced apart from the main piston;
A juice spring disposed between the main piston and the auxiliary piston to elastically support the main piston;
An auxiliary spring embedded in the master housing and elastically supporting the auxiliary piston; And
Is coupled to the other end of the drive rod, and includes an additional piston for adjusting the volume of the additional chamber,
And the auxiliary piston divides an internal space of the master housing into the main chamber and the auxiliary chamber, wherein the main chamber is disposed between the main piston and the auxiliary piston.
The method of claim 1, wherein the integrated flow path unit
A first passage connecting the pedal cylinder portion and the first integrated valve to guide the fluid;
A second passage connecting the first passage and the second integration valve to guide the fluid;
A third flow passage connecting the second integration valve and the third integration valve to guide the fluid;
A fourth passage extending from the third passage and connected to the additional housing;
A pedal passage configured to guide the fluid by connecting the storage unit and the pedal cylinder unit; And
And a master flow passage connecting the master housing portion and the third integrated valve to guide the fluid and communicating with the pedal flow passage.
The method of claim 5, wherein the second flow path
Electronic hydraulic brake device comprising a pedal pressure sensor for measuring the pressure of the pedal by measuring the hydraulic pressure.

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