KR102469362B1 - Electric brake system - Google Patents

Abstract

An electronic brake system is disclosed. An electronic brake system according to the present embodiment includes a first block including a master cylinder having a first master piston connected to a brake pedal and a first master chamber whose volume is varied by displacement of the first master piston; A pedal simulator, a hydraulic pressure supply device that generates hydraulic pressure by operating a hydraulic piston by an electrical signal, and a first hydraulic circuit that controls the hydraulic pressure transmitted to two wheel cylinders and controls the hydraulic pressure transmitted to the other two wheel cylinders A second block including a hydraulic control unit having a second hydraulic circuit and spaced apart from the first block; a plurality of electronic control units controlling various devices and valves based on hydraulic pressure information and displacement information of the brake pedal; and a connection line having one end connected to the first block and the other end connected to the second block.

Description

Electronic brake system {Electric brake system}

The present invention relates to an electronic brake system, and more particularly, to an electronic brake system that improves pedal feel and reduces kickback.

A brake system for performing braking is necessarily installed in a vehicle, and various types of brake systems have been proposed for the safety of drivers and passengers.

A conventional brake system mainly uses a method of supplying hydraulic pressure necessary for braking to wheel cylinders using a mechanically connected booster when a driver steps on a brake pedal. However, as the market demand for implementing various braking functions in detail in response to the operating environment of the vehicle increases, recently the driver's will to brake is determined electrically from the pedal displacement sensor that detects the displacement of the brake pedal when the driver steps on the brake pedal. An electronic brake system that receives a signal and operates a hydraulic pressure supply device based thereon to supply hydraulic pressure required for braking to a wheel cylinder is widely used.

Such an electronic brake system generates and provides an electrical signal to determine braking when the driver operates the brake pedal or autonomously drives the vehicle in a normal operation mode, and based on this, the hydraulic pressure supply device is electrically operated and controlled to reduce the hydraulic pressure required for braking. formed and delivered to the wheel cylinder. In this way, these electronic brake systems and operating methods are electrically operated and controlled, so they can implement complex and various braking actions, but when a technical problem occurs in an electric component element, the hydraulic pressure required for braking is not stably formed. There is a risk of endangering the safety of passengers.

Since most components of the electronic brake system are controlled by electrical signals of an electronic control unit (ECU), it may cause a big problem when the electronic control unit fails. Therefore, the electronic brake system may have a plurality of electronic control units in case the electronic control unit fails, and even if one electronic control unit operates abnormally, it is connected so that the other electronic control unit that recognizes it operates so that the safety of passengers is ensured. may also promote

On the other hand, at the moment when one electronic control unit operating in normal mode fails and another electronic control unit that recognizes it fails and operates, the electronic brake system temporarily operates in an abnormal operation mode in which there is no electrical signal. , When changing the mode, discomfort such as kickback may occur in the driver's pedal feeling.

EP 2 520 473 A1 (Honda Motor Co., Ltd.) 2012. 11. 7.

The present embodiment is intended to provide an electronic brake system capable of effectively implementing braking in various operating situations.

The present embodiment is intended to provide an electronic brake system with improved performance and operational reliability.

The present embodiment is intended to provide an electronic brake system capable of improving the degree of freedom in vehicle design.

The present embodiment is intended to provide an electronic brake system capable of easily and efficiently installing and arranging a vehicle.

The present embodiment is intended to provide an electronic brake system capable of stably providing braking pressure even in the event of a component failure.

The present embodiment is intended to provide an electronic brake system capable of improving safety through a redundancy function of a plurality of electronic control units.

The present embodiment is intended to provide an electronic brake system capable of reducing kickback and maintaining a pedal feel to reduce a sense of heterogeneity in a driver's pedal feel.

According to one aspect of the present invention, a first block including a master cylinder having a first master piston connected to the brake pedal, and a first master chamber whose volume is varied by displacement of the first master piston; A pedal simulator, a hydraulic pressure supply device that generates hydraulic pressure by operating a hydraulic piston by an electrical signal, and a first hydraulic circuit that controls the hydraulic pressure transmitted to two wheel cylinders and controls the hydraulic pressure transmitted to the other two wheel cylinders a second block including a hydraulic control unit having a second hydraulic circuit and spaced apart from the first block; a plurality of electronic control units controlling various devices and valves based on hydraulic pressure information and displacement information of the brake pedal; and a connection line having one end connected to the first block and the other end connected to the second block, wherein the connection line has one end connected to the first master chamber and the other end connected to the pedal simulator side. We want to provide a brake system.

The master cylinder further includes a second master piston provided to be displaceable by the hydraulic pressure of the first master chamber, and a second master chamber whose volume is varied by displacement of the second master piston, and the connection line is An electronic brake system further includes a second connection line having one end connected to the second master chamber and the other end connected to the second hydraulic circuit.

The first block further includes a main reservoir in which pressurized medium is stored, and the electronic unit further includes a sub-reservoir in which pressurized medium is stored, and one end of the connection line is connected to the main reservoir and the other end is connected to the sub-reservoir. It is intended to provide an electronic brake system further comprising a third connection line connected to.

The second block includes an outlet passage connecting the first hydraulic circuit and the sub reservoir, a first cut valve provided in the outlet passage and controlling a flow of pressurized medium, and a flow of pressurized medium provided in the second connection line. To provide an electronic brake system further comprising a second cut valve for controlling.

The second block further includes a first sub-reservoir passage connecting the sub-reservoir and the rear end of the first hydraulic circuit, and a second sub-reservoir passage connecting the sub-reservoir and the rear end of the second hydraulic circuit. We want to provide a brake system.

The second block further includes a simulator discharge passage connected to a rear end of the pedal simulator, and the simulator discharge passage joins the first sub-reservoir passage to be connected to the sub-reservoir.

The hydraulic control unit further includes a balance passage connecting the first hydraulic circuit and the second hydraulic circuit, and a balance valve provided in the balance passage to control the flow of a pressurized medium.

The first block is intended to provide an electronic brake system further including a pedal folding device provided between the first master piston and the brake pedal.

The first block further includes a main reservoir in which pressurized medium is stored, and the electronic unit further includes a sub-reservoir in which pressurized medium is stored, and one end of the connection line is connected to the main reservoir and the other end is connected to the sub-reservoir. It is intended to provide an electronic brake system further comprising a second connection line connected to.

The second block further includes a first sub-reservoir passage connecting the sub-reservoir and the rear end of the first hydraulic circuit, and a second sub-reservoir passage connecting the sub-reservoir and the rear end of the second hydraulic circuit. We want to provide a brake system.

The second block includes a first outlet passage connecting the first hydraulic circuit and the first sub-reservoir passage, a second outlet passage connecting the second hydraulic circuit and the sub-reservoir, and the first outlet passage. It is intended to provide an electronic brake system further comprising a first cut valve provided to control the flow of a pressurized medium and a second cut valve provided to the second outlet passage to control the flow of a pressurized medium.

The second block further includes a simulator discharge passage connected to a rear end of the pedal simulator, and the simulator discharge passage joins the first sub-reservoir passage to be connected to the sub-reservoir.

The pedal folding device provides an electronic brake system including an actuator for generating and providing power, and a gear part provided between an input rod connected to the brake pedal and the actuator to convert the rotational force of the actuator into linear motion of the input rod want to do

The hydraulic pressure supply device is intended to provide an electronic brake system including a first pressure chamber provided in front of the hydraulic piston and a second pressure chamber provided in the rear of the hydraulic piston.

The second block further includes a dump control unit provided between the sub reservoir and the hydraulic pressure supply device to control the flow of pressurized medium, and the dump control unit controls the flow of pressurized medium between the first pressure chamber and the sub reservoir. It is intended to provide an electronic brake system including a first dump control unit for controlling and a second dump control unit for controlling the flow of pressurized medium between the second pressure chamber and the sub-reservoir.

The second block further includes a third sub-reservoir passage connecting the sub-reservoir and the first dump control unit, and a fourth sub-reservoir passage connecting the sub-reservoir and the second dump control unit. want to do

The plurality of electronic control units is an electronic brake system including a first electronic control unit that controls various devices and valves, and a second electronic control unit that operates to control the electronic part when the first electronic control unit is abnormally operated. want to provide

The electronic brake system according to the present embodiment can stably and effectively implement braking in various operating situations of a vehicle.

The electronic brake system according to this embodiment can improve the degree of freedom in vehicle design.

The electronic brake system according to the present embodiment can be easily and efficiently installed and arranged in a vehicle.

The electronic brake system according to this embodiment can improve product performance and operational reliability.

The electronic brake system according to this embodiment can stably provide braking pressure even when a component fails.

The electronic brake system according to this embodiment can improve safety through the redundancy function of a plurality of electronic control units.

The electronic brake system according to the present embodiment reduces kickback and maintains pedal feel, thereby reducing a driver's sense of difference in pedal feel.

1 is a hydraulic circuit diagram showing an electronic brake system according to a first embodiment of the present invention.
2 is a hydraulic circuit diagram showing the operation of the electronic brake system according to the first embodiment of the present invention in the first normal mode.
3 is a hydraulic circuit diagram showing an operation in a switching state of the electronic brake system according to the first embodiment of the present invention.
4 is a hydraulic circuit diagram showing the operation of the electronic brake system according to the first embodiment of the present invention in the second normal mode.
5 is a hydraulic circuit diagram showing the operation of the electronic brake system according to the first embodiment of the present invention in a fallback mode.
6 is a hydraulic circuit diagram showing an electronic brake system according to a modified example of the first embodiment of the present invention.
7 is a hydraulic circuit diagram showing an electronic brake system according to a second embodiment of the present invention.
8 is a hydraulic circuit diagram showing the operation of the electronic brake system according to the second embodiment of the present invention in the first normal mode.
9 is a hydraulic circuit diagram showing an operation in a switching state of an electronic brake system according to a second embodiment of the present invention.
10 is a hydraulic circuit diagram showing the operation of the electronic brake system according to the second embodiment of the present invention in the second normal mode.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented to sufficiently convey the spirit of the present invention to those skilled in the art. The present invention may be embodied in other forms without being limited to only the embodiments presented herein. In the drawings, in order to clarify the present invention, illustration of parts irrelevant to the description may be omitted, and the size of components may be slightly exaggerated to aid understanding.

1 is a hydraulic circuit diagram showing an electronic brake system 1000 according to a first embodiment of the present invention.

Referring to FIG. 1, an electronic brake system 1000 according to a first embodiment of the present invention includes a first block 100 including a master cylinder 1200, a pedal simulator 1250, and a hydraulic pressure supply device 1300. And a second block 200 including a hydraulic control unit 1400 and spaced apart from the first block 100, a plurality of electronic control units 300, one end connected to the first block 100 and the other end A connection line 1600 connected to the second block 200 may be provided.

The first block 100 is connected to and interlocked with the brake pedal 10 to mechanically operate a mechanical unit is disposed, and the second block 200 is a valve and sensor whose operation is controlled by an electronic control unit (ECU, 300) An electronic unit operated and controlled in an iso-electronic manner is disposed. The first block 100 and the second block 200 are disposed apart from each other in the vehicle but may be hydraulically connected by a plurality of connection lines 1600, thereby improving the vehicle mountability of the electronic brake system 1000 and In addition, it is possible to achieve efficient space arrangement by promoting the degree of freedom in vehicle design.

The mechanical part includes parts that perform mechanical operations in conjunction with the brake pedal 10 regardless of the control signal of the electronic control unit, and may be disposed in the first block 100.

The first block 100 includes a main reservoir 1100a in which pressurized medium such as brake oil is stored, and a master cylinder 1200 that pressurizes and discharges pressurized medium such as brake oil accommodated inside according to the pedal force of the brake pedal 10 , Main reservoir passages 1110a and 1120a connecting the main reservoir 1100a and the master cylinder 1200 may be included.

The master cylinder 1200 is configured to include at least one hydraulic chamber, and can pressurize and discharge an internal pressurized medium. The master cylinder 1200 includes a first master chamber 1220a, a second master chamber 1230a, and a first master piston 1220 and a second master piston 1230 provided in each of the master chambers 1220a and 1230a. can be provided

The first master chamber 1220a may be formed on the inlet side (right side of FIG. 1 ) of the cylinder block 1210 to which the brake pedal 10 is connected, and the first master chamber 1220a includes the first master piston. 1220 may be accommodated to be reciprocating.

A pressurized medium may be introduced into and discharged from the first master chamber 1220a through the first hydraulic port 1280a and the second hydraulic port 1280b. The first hydraulic port 1280a is connected to a first main reservoir flow path 1110a to be described later so that pressurized medium flows from the main reservoir 1100a into the first master chamber 1220a, and the front side of the first hydraulic port 1280a. A pair of sealing members may be provided on the left (left side of FIG. 1 ) and the rear side (right side side of FIG. 1 ) to seal the first master chamber 1220a. The second hydraulic port 1280b is connected to a first connection line 1610 to be described later so that the pressurized medium in the first master chamber 1220a is discharged to the first connection line 1610 or, conversely, the first connection line 1610 A pressurized medium may be introduced into the first master chamber 1220a.

The first master piston 1220 is accommodated and provided in the first master chamber 1220a, pressurizes the pressurized medium accommodated in the first master chamber 1220a by moving forward, or pressurizes the inside of the first master chamber 1220a by moving backward. negative pressure can be created. Specifically, when the first master piston 1220 moves forward, as the volume of the first master chamber 1220a decreases, the pressurized medium existing inside the first master chamber 1220a may be pressurized to form hydraulic pressure. . Conversely, as the volume of the first master chamber 1220a increases when the first master piston 1220 moves backward, the pressurized medium existing inside the first master chamber 1220a may be depressurized. A negative pressure may be formed in the master chamber 1220a.

The second master chamber 1230a may be formed on the front side (left side of FIG. 1 ) of the first master chamber 1220a on the cylinder block 1210, and the second master chamber 1230a has a second master piston. 1230 may be accommodated to be reciprocating.

A pressurized medium may be introduced into and discharged from the second master chamber 1230a through the third hydraulic port 1280c and the fourth hydraulic port 1280d. The third hydraulic port 1280c is connected to a second main reservoir flow path 1120a to be described later so that pressurized medium flows from the main reservoir 1100a into the second master chamber 1230a, and the front side of the third hydraulic port 1280c. A pair of sealing members may be provided on the left (left side of FIG. 1 ) and the rear side (right side side of FIG. 1 ) to seal the second master chamber 1230a. The fourth hydraulic port 1280d is connected to a second connection line 420 to be described later so that the pressurized medium of the second master chamber 1230a is discharged to the second connection line 420 or, conversely, the second connection line 420 A pressurized medium may be introduced into the second master chamber 1230a.

The second master piston 1230 is accommodated and provided in the second master chamber 1230a, pressurizes the pressurized medium accommodated in the second master chamber 1230a by moving forward, or pressurizes the inside of the second master chamber 1230a by moving backward. negative pressure can be created. Specifically, when the second master piston 1230 moves forward, as the volume of the second master chamber 1230a decreases, the pressurized medium existing inside the second master chamber 1230a is pressurized to form hydraulic pressure. . Conversely, when the second master piston 1230 moves backward, as the volume of the second master chamber 1230a increases, the pressurized medium present in the second master chamber 1230a may be depressurized. 2 A negative pressure may be formed in the master chamber 1230a.

The first piston spring 1220b and the second piston spring 1230b are provided to elastically support the first master piston 1220 and the second master piston 1230, respectively. To this end, the first piston spring 1220b is interposed between the front surface (left end with reference to FIG. 1) of the first master piston 1220 and the rear surface (right end with reference to FIG. 1) of the second master piston 1230. , and the second piston spring 1230b may be disposed between the front surface (left end of FIG. 1 ) of the second master piston 1230 and the inner surface of the cylinder block 1210 . When displacement occurs in the first master piston 1220 and the second master piston 1230 according to an operation such as braking, the first piston spring 1220b and the second piston spring 1230b are compressed, respectively, and then braking, etc. When the operation is released, the first piston spring 1220b and the second piston spring 1230b expand by elastic force while the first master piston 1220 and the second master piston 1230 return to their original positions, respectively. .

The main reservoir 1100a may accommodate and store a pressurized medium therein. The main reservoir 1100a may be connected to component elements such as the master cylinder 1200 and a third connection line 1630 to be described later to supply or receive a pressurized medium.

The main reservoir 1100a may be divided into a plurality of chambers by partition walls 1105a. The main reservoir 1100a includes a plurality of main reservoir chambers 1101a, 1102a, and 1103a, and the plurality of main reservoir chambers 1101a, 1102a, and 1103a may be arranged side by side in a row. Specifically, the main reservoir 1100a includes a first main reservoir chamber 1101a disposed in the center, a second main reservoir chamber 1102a disposed on one side, and a third main reservoir chamber 1103a disposed on the other side. can be distinguished.

The partition walls 1105a may be provided between adjacent main reservoir chambers, and at least a part of an upper end of each partition wall 1105a may be open. As a result, the adjacent main reservoir chambers 1101a, 1102a, and 1103a communicate with each other so that the pressurized medium can move. For example, when a large amount of pressurized medium flows into the first main reservoir chamber 1101a, the pressurized medium passes through the top of the partition wall 1105a to the second main reservoir chamber 1102a or the third main reservoir chamber 1103a. can be conveyed

The first main reservoir chamber 1101a may be connected to a third connection line 1630 to be described later to supply a pressurized medium to the sub-reservoir 1100b or receive a pressurized medium from the sub-reservoir 1100b. The reservoir chamber 1102a is connected to a first main reservoir flow path 1110a described later, and the third main reservoir chamber 1103a is connected to a second main reservoir flow path 1120a to supply pressurized medium to the master cylinder 1200 side. or can be delivered.

In this way, since the main reservoir 1100a is partitioned into the first to third main reservoir chambers 1101a, 1102a, and 1103a, stable operation of the electronic brake system 1000 can be promoted. For example, when the main reservoir 1100a is formed as a single chamber and the capacity of the pressurized medium is insufficient, the pressurized medium cannot be stably supplied not only to the sub reservoir 1100b but also to the master cylinder 1200. Therefore, the first main reservoir chamber 1101a in which the main reservoir 1100a is connected to the sub reservoir 1100b of the second block 200, and the second and third main reservoir chambers connected to the master cylinder 1200 side ( By providing 1102a and 1103a) separately, even when the pressurized medium cannot be supplied to one component, braking of the vehicle can be realized by supplying the pressurized medium to another component.

The main reservoir passage is provided to hydraulically connect the master cylinder 1200 and the main reservoir 1100a.

The main reservoir flow path includes the first main reservoir flow path 1110a connecting the first master chamber 1220a and the second main reservoir chamber 1102a of the main reservoir 1100a, the second master chamber 1230a and the main reservoir ( It may include a second main reservoir flow path 1120a connecting the third main reservoir chamber 1103a of 1100a. To this end, one end of the first main reservoir passage 1110a may communicate with the first master chamber 1220a of the master cylinder 1200, and the other end may communicate with the second main reservoir chamber 1102a of the main reservoir 1100a. One end of the second main reservoir passage 1120a may communicate with the second master chamber 1230a of the master cylinder 1200, and the other end may communicate with the third main reservoir chamber 1103a of the main reservoir 1100a. have.

The electronic part includes parts and elements electronically operated and controlled by a control signal of the electronic control unit (ECU) 300, and may be disposed in the second block 200.

The second block 200 includes a sub-reservoir 1100b for auxiliary storage of pressurized medium inside, a pedal simulator 1250 for providing a reaction force to the driver's brake pedal 10 pedal force, and displacement of the brake pedal 10. The hydraulic pressure supply device 1300 receives the driver's will to brake as an electrical signal by the pedal displacement sensor 11 that detects and generates hydraulic pressure of the pressurized medium through mechanical operation, and the hydraulic pressure provided by the hydraulic pressure supply device 1300 and the hydraulic control unit 1400 for controlling the hydraulic pressure transmitted to the first to fourth wheel cylinders 21, 22, 23, 24, the sub reservoir 1100b and the hydraulic pressure supply device 1300 are hydraulically connected, but these A dump control unit 1800 controlling the flow of pressurized medium between the dump control unit 1800 and a plurality of sub-reservoir passages 1710 and 1720 connecting the sub-reservoir 1100b to the first and second hydraulic circuits 1510 and 1520 and the dump control unit 1800. , 1730, 1740), a plurality of cut valves 411 and 422a provided on the connection line to control the flow of pressurized medium, an inspection valve 1900 for inspecting the leak of the master cylinder 1200, a hydraulic pressure supply device ( 1300) may include a circuit pressure sensor PS1 for detecting the hydraulic pressure of the pressurized medium and a cylinder pressure sensor PS2 for detecting the hydraulic pressure of the second master chamber 1230a.

The electronic control unit 300 may receive electrical signals sensed by various sensors, transmit electrical signals to various devices and component elements such as valves, and determine whether or not there is an abnormality.

For example, the electronic control unit 300 may determine whether the electronic control unit 300 is abnormal through signals detected by sensors such as the pedal displacement sensor 11 and the pressure sensors PS1 and PS2.

The electronic control unit 300 may be provided in plurality and have a redundancy function. Specifically, the electronic control unit 300 may include a first electronic control unit 310 and a second electronic control unit 320, and the first electronic control unit 310 controls various devices and valves in normal times. And, the second electronic control unit 320 can operate to control various devices and valves instead of the first electronic control unit 310 when the first electronic control unit 310 is abnormally operated. That is, when the first electronic control unit 310 operates abnormally, the sensor recognizes whether there is an abnormality, blocks the signal of the first electronic control unit 310, and the second electronic control unit 320 operates various devices and valves. can work to control.

The sub-reservoir 1100b may be disposed in the second block 200 to auxiliary store the pressurized medium. As the pressurized medium is also auxiliaryly stored in the second block 200 by the sub-reservoir 1100b, the hydraulic pressure supply device 1300, the dump control unit 1800, the first and second hydraulic circuits 1510 and 1520, etc. Even within the block 200, the pressurized medium can be smoothly supplied and delivered.

The sub reservoir 1100b may be connected to the main reservoir 1100a of the first block 100 by a third connection line 1630 to be described later. In addition, the sub-reservoir 1100b may be connected to the first hydraulic circuit 1510 and the second hydraulic circuit 1520 by a first sub-reservoir passage 1710 and a second sub-reservoir passage 1720, which will be described later, respectively. It may be connected to the dump controller 1800 by the third sub-reservoir passage 1730 and the fourth sub-reservoir passage 1740 .

The hydraulic pressure supply device 1300 receives the driver's will to brake as an electrical signal from the pedal displacement sensor 11 that detects the displacement of the brake pedal 10 and generates hydraulic pressure of the pressurized medium through mechanical operation.

The hydraulic pressure supply device 1300 includes a hydraulic pressure supply unit that provides pressurized medium pressure transmitted to the wheel cylinder 20, a motor (not shown) that generates rotational force by an electrical signal from the pedal displacement sensor 11, and a motor It may include a power conversion unit (not shown) for converting rotational motion into linear motion and transmitting the converted motion to the hydraulic pressure providing unit.

The hydraulic pressure providing unit is provided between a cylinder block 1310 in which pressurized medium is accommodated, a hydraulic piston 1320 accommodated in the cylinder block 1310, and a pressure chamber provided between the hydraulic piston 1320 and the cylinder block 1310. It includes a sealing member 1350 for sealing 1330 and 1340 and a drive shaft 1390 for transmitting power output from the power conversion unit to the hydraulic piston 1320.

The pressure chambers 1330 and 1340 include a first pressure chamber 1330 located in the front of the hydraulic piston 1320 (in the left direction of the hydraulic piston 1320 with reference to FIG. 1) and the rear of the hydraulic piston 1320 ( A second pressure chamber 1340 located in the right direction of the hydraulic piston 1320 based on FIG. 1 may be included. That is, the first pressure chamber 1330 is partitioned by the front surface of the cylinder block 1310 and the hydraulic piston 1320, and is provided so that the volume varies according to the movement of the hydraulic piston 1320, and the second pressure chamber 1340 ) Is partitioned by the rear surface of the cylinder block 1310 and the hydraulic piston 1320 and is provided so that the volume varies according to the movement of the hydraulic piston 1320.

The first pressure chamber 1330 is connected to a first hydraulic oil passage 1401 to be described later through a first communication hole formed in the cylinder block 1310, and the second pressure chamber 1340 is formed in the cylinder block 1310. It is connected to a second hydraulic oil passage 1402 to be described later through a second communication hole.

The sealing member is a piston sealing member 1350a provided between the hydraulic piston 1320 and the cylinder block 1310 to seal between the first pressure chamber 1330 and the second pressure chamber 1340, and the drive shaft 1390 and the cylinder. A drive shaft sealing member 1350b provided between the block 1310 and sealing the opening of the second pressure chamber 1340 and the cylinder block 1310 is included. The hydraulic or negative pressure of the first pressure chamber 1330 and the second pressure chamber 1340 generated by the forward or backward movement of the hydraulic piston 1320 is sealed by the piston sealing member 1350a and the driving shaft sealing member 1350b. It can be transmitted to the first hydraulic oil passage 1401 and the second hydraulic oil passage 1402 to be described later without leakage. In addition, a chamber sealing member 1350c may be provided between the second pressure chamber 1340 and the driving shaft sealing member 1350b, and the chamber sealing member 1350c passes through an auxiliary inflow passage 1850 to be described later to provide a second pressure. The flow of the pressurized medium flowing into the chamber 1340 may be allowed, but the flow of the pressurized medium leaking from the second pressure chamber 1340 to the auxiliary inflow passage 1850 may be blocked.

A motor (not shown) is provided to generate a driving force of the hydraulic piston 1320 by an electrical signal output from the electronic control unit 300 . The motor may include a stator and a rotor, and may provide power for generating displacement of the hydraulic piston 1320 by rotating in a forward or reverse direction through the stator. The rotational angular velocity and rotational angle of the motor can be precisely controlled by the motor control sensor. Since the motor is a well-known technology, a detailed description thereof will be omitted.

A power conversion unit (not shown) is provided to convert the rotational force of the motor into linear motion. The power conversion unit may be provided in a structure including, for example, a worm shaft (not shown), a worm wheel (not shown), and a drive shaft 1390.

The worm shaft may be integrally formed with the rotational axis of the motor, and a worm may be formed on an outer circumferential surface of the worm shaft to rotate the worm wheel by engaging with the worm wheel. The worm wheel is connected to engage with the drive shaft 1390 to linearly move the drive shaft 1390, and the drive shaft 1390 is connected to the hydraulic piston 1320 to operate integrally, through which the hydraulic piston 1320 operates as a cylinder It can slide within block 1310.

To explain the above operations again, when the displacement of the brake pedal 10 is detected by the pedal displacement sensor 11, the detected signal is transmitted to the electronic control unit 300, and the electronic control unit 300 drives the motor. to rotate the worm shaft in one direction. The rotational force of the worm shaft is transmitted to the drive shaft 1390 via the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 moves forward within the cylinder block 1310 to generate hydraulic pressure in the first pressure chamber 1330. have.

Conversely, when the pedal force of the brake pedal 10 is released, the electronic control unit 300 drives the motor to rotate the worm shaft in the opposite direction. Therefore, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 moves backward within the cylinder block 1310 to generate negative pressure in the first pressure chamber 1330.

The generation of hydraulic pressure and negative pressure in the second pressure chamber 1340 can be implemented by operating in the opposite direction from above. That is, when the displacement of the brake pedal 10 is detected by the pedal displacement sensor 11, the detected signal is transmitted to the electronic control unit 300, and the electronic control unit 300 drives the motor to reverse the worm shaft. rotate in the direction The rotational force of the worm shaft is transmitted to the drive shaft 1390 via the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 moves backward within the cylinder block 1310 to generate hydraulic pressure in the second pressure chamber 1340. have.

Conversely, when the pressing force of the brake pedal 10 is released, the electronic control unit drives the motor in one direction to rotate the worm shaft in one direction. Therefore, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 moves forward within the cylinder block 1310, thereby generating negative pressure in the second pressure chamber 1340.

As such, the hydraulic pressure supply device 1300 may generate hydraulic pressure or negative pressure in the first pressure chamber 1330 and the second pressure chamber 1340, respectively, depending on the rotation direction of the worm shaft by the driving of the motor. It can be determined by controlling the valves whether braking is realized by using negative pressure or braking is released by using negative pressure.

On the other hand, the power conversion unit according to this embodiment is not limited to any one structure as long as it can convert the rotational motion of the motor into the linear motion of the hydraulic piston 1320, and it is understood the same even if it is made of various structures and types of devices. It should be.

The hydraulic pressure supply device 1300 may be hydraulically connected to the sub reservoir 1100b by the dump control unit 1800. The dump control unit 1800 includes a first dump control unit that controls the flow of pressurized medium between the first pressure chamber 1330 and the sub-reservoir 1100b, and pressurization between the second pressure chamber 1340 and the sub-reservoir 1100b. A second dump control unit for controlling the flow of the medium may be included. The first dump controller includes a first dump flow path 1810 connecting the first pressure chamber 1330 and the sub reservoir 1100b, and a first bypass flow path 1830 diverged and rejoined on the first dump flow path 1810. ), and the second dump controller includes a second dump passage 1820 connecting the second pressure chamber 1340 and the sub reservoir 1100b, and a second dump passage 1820 that diverges and rejoins on the second dump passage 1820. A bypass flow path 1840 may be included.

A first dump check valve 1811 and a first dump valve 1831 for controlling the flow of a pressurized medium may be provided in the first dump passage 1810 and the first bypass passage 1830, respectively. The first dump check valve 1811 may be provided to allow only the flow of the pressurized medium from the sub reservoir 1100b to the first pressure chamber 1330 and block the flow of the pressurized medium in the opposite direction. 1810), a first bypass flow path 1830 is connected in parallel to the first dump check valve 1811, and between the first pressure chamber 1330 and the sub reservoir 1100b in the first bypass flow path 1830. A first dump valve 1831 for controlling the flow of the pressurized medium may be provided. In other words, the first bypass flow path 1830 may bypass and connect the front end and the rear end of the first dump check valve 1811 on the first dump flow path 1810, and the first dump valve 1831 may generate the first pressure It may be provided as a two-way solenoid valve that controls the flow of pressurized medium between the chamber 1330 and the sub-reservoir 1100b. The first dump valve 1831 may be provided as a normally closed type solenoid valve that is normally closed and operates to open when an electrical signal is received from the electronic control unit.

A second dump check valve 1821 and a second dump valve 1841 for controlling the flow of pressurized medium may be provided in the second dump passage 1820 and the second bypass passage 1840, respectively. The second dump check valve 1821 may be provided to allow only the flow of the pressurized medium from the sub reservoir 1100b to the second pressure chamber 1330 and block the flow of the pressurized medium in the opposite direction. 1820), a second bypass flow path 1840 is connected in parallel to the second dump check valve 1821, and between the second pressure chamber 1330 and the sub reservoir 1100b in the second bypass flow path 1840. A second dump valve 1841 for controlling the flow of the pressurized medium may be provided. In other words, the second bypass passage 1840 may bypass and connect the front end and the rear end of the second dump check valve 1821 on the second dump passage 1820, and the second dump valve 1841 may provide the second pressure It may be provided as a two-way solenoid valve that controls the flow of pressurized medium between the chamber 1330 and the sub-reservoir 1100b. The second dump valve 1841 may be provided as a normal open type solenoid valve that is normally open but closes when an electrical signal is received from the electronic control unit.

In addition, the dump controller 1800 may include an auxiliary inflow passage 1850 connecting the sub reservoir 1100b and the second pressure chamber 1340 so that the second pressure chamber 1340 can be filled with the pressurized medium. The auxiliary inflow passage 1850 may be connected to a rear side (right side of FIG. 1 ) of the chamber sealing member 1350c on the cylinder body 1310 . Thus, the pressurized medium flows from the sub-reservoir 1100b to the second pressure chamber 1340 through the auxiliary inflow passage 1850, and the second pressure chamber 1340 by the chamber sealing member 1350c through the auxiliary inflow passage ( 1850) can block the flow of pressurized medium.

The hydraulic control unit 1400 may be provided to control the hydraulic pressure transmitted to each wheel cylinder 20, and the electronic control unit (ECU) is configured to supply the hydraulic pressure supply device 1300 and various types of hydraulic pressure based on hydraulic pressure information and pedal displacement information. Arranged to control the valves.

The hydraulic control unit 1400 includes a second hydraulic circuit 1520 that controls the flow of hydraulic pressure transmitted to the first and second wheel cylinders 21 and 22 among the four wheel cylinders 20, and the third and second hydraulic circuits 1520. A first hydraulic circuit 1510 may be provided to control the flow of hydraulic pressure transmitted to the 4 wheel cylinders 23 and 24, and a number of hydraulic pressures transmitted from the hydraulic pressure supply device 1300 to the wheel cylinder 20 may be controlled. of the flow path and valve.

The first hydraulic oil passage 1401 may be provided to communicate with the first pressure chamber 1330 , and the second hydraulic oil passage 1402 may be provided to communicate with the second pressure chamber 1340 . After the first hydraulic oil passage 1401 and the second hydraulic oil passage 1402 merge into the third hydraulic oil passage 1403, the fourth hydraulic oil passage 1404 connected to the second hydraulic circuit 1520 and the first hydraulic oil passage 1404 It may be provided by branching again to the fifth hydraulic oil passage 1405 connected to the circuit 1510.

The sixth hydraulic oil passage 1406 is provided to communicate with the second hydraulic circuit 1520, and the seventh hydraulic oil passage 1407 is provided to communicate with the first hydraulic circuit 1510. After the sixth hydraulic oil passage 1406 and the seventh hydraulic oil passage 1407 merge into the eighth hydraulic oil passage 1408, the ninth hydraulic oil passage 1409 communicating with the first pressure chamber 1330 and the second pressure It may be provided by branching again to the tenth hydraulic oil passage 1410 communicating with the chamber 1340 .

A first valve 1431 for controlling the flow of the pressurized medium may be provided in the first hydraulic oil passage 1401 . The first valve 1431 may be provided as a check valve that allows the flow of the pressurized medium discharged from the first pressure chamber 1330 but blocks the flow of the pressurized medium in the opposite direction. In addition, a second valve 1432 may be provided in the second hydraulic oil passage 1402 to control the flow of the pressurized medium, and the second valve 1432 controls the flow of the pressurized medium discharged from the second pressure chamber 1340. It may be provided with a check valve that allows, but blocks the flow of pressurized medium in the opposite direction.

The fourth hydraulic oil path 1404 is branched off from the third hydraulic oil path 1403 where the first hydraulic oil path 1401 and the second hydraulic oil path 1402 join, and is connected to the second hydraulic circuit 1520. A third valve 1433 for controlling the flow of the pressurized medium may be provided in the fourth hydraulic oil passage 1404 . The third valve 1433 may be provided as a check valve that allows only the flow of the pressurized medium from the third hydraulic oil passage 1403 toward the second hydraulic circuit 1520 and blocks the flow of the pressurized medium in the opposite direction.

The fifth hydraulic oil path 1405 is provided by branching again from the third hydraulic oil path 1403 where the first hydraulic oil path 1401 and the second hydraulic oil path 1402 join, and connected to the first hydraulic circuit 1510 . A fourth valve 1434 for controlling the flow of the pressurized medium may be provided in the fifth hydraulic oil passage 1405 . The fourth valve 1434 may be provided as a check valve that allows only the flow of the pressurized medium from the third hydraulic oil passage 1403 toward the first hydraulic circuit 1510 and blocks the flow of the pressurized medium in the opposite direction.

The sixth hydraulic oil passage 1406 communicates with the second hydraulic circuit 1520, and the seventh hydraulic oil passage 1407 communicates with the first hydraulic circuit 1510 and is provided to join the eighth hydraulic oil passage 1408. . A fifth valve 1435 may be provided in the sixth hydraulic oil passage 1406 to control the flow of the pressurized medium. The fifth valve 1435 may be provided as a check valve that allows only the flow of the pressurized medium discharged from the second hydraulic circuit 1520 and blocks the flow of the pressurized medium in the opposite direction. In addition, a sixth valve 1436 may be provided in the seventh hydraulic oil passage 1407 to control the flow of the pressurized medium. The sixth valve 1436 may be provided as a check valve that allows only the flow of the pressurized medium discharged from the first hydraulic circuit 1510 and blocks the flow of the pressurized medium in the opposite direction.

The ninth hydraulic oil passage 1409 is branched from the eighth hydraulic oil passage 1408 where the sixth hydraulic oil passage 1406 and the seventh hydraulic oil passage 1407 join, and is connected to the first pressure chamber 1330. A seventh valve 1437 may be provided in the ninth hydraulic oil passage 1409 to control the flow of the pressurized medium. The seventh valve 1437 may be provided as a two-way control valve that controls the flow of the pressurized medium passing along the ninth hydraulic oil passage 1409 . The seventh valve 1437 may be provided as a normally closed type solenoid valve that is normally closed and operates to open when an electrical signal is received from the electronic control unit.

The tenth hydraulic oil passage 1410 is branched from the eighth hydraulic oil passage 1408 where the sixth hydraulic oil passage 1406 and the seventh hydraulic oil passage 1407 join, and is connected to the second pressure chamber 1340 . An eighth valve 1438 may be provided in the tenth hydraulic oil passage 1410 to control the flow of the pressurized medium. The eighth valve 1438 may be provided as a two-way control valve that controls the flow of the pressurized medium passing along the tenth hydraulic oil passage 1410 . Like the seventh valve 1437, the eighth valve 1438 is provided as a normally closed type solenoid valve that is normally closed and operates to open when an electrical signal is received from the electronic control unit. It can be.

In the hydraulic control unit 1400, the hydraulic pressure formed in the first pressure chamber 1330 according to the advancement of the hydraulic piston 1320 by the arrangement of the hydraulic oil path and the valve is transferred to the first hydraulic oil path 1401 and the third hydraulic oil path ( 1403) and the fourth hydraulic oil passage 1404, and can be transmitted to the second hydraulic circuit 1520, and sequentially passing through the first hydraulic oil passage 1401 and the fifth hydraulic oil passage 1405. (1510). In addition, the hydraulic pressure formed in the second pressure chamber 1340 as the hydraulic piston 1320 moves backward is transmitted to the second hydraulic circuit 1520 through the second hydraulic oil passage 1402 and the fourth hydraulic oil passage 1404 sequentially. The second hydraulic oil passage 1402, the third hydraulic oil passage 1403, and the fifth hydraulic oil passage 1405 can be sequentially transmitted to the first hydraulic circuit 1510.

Conversely, the negative pressure formed in the first pressure chamber 1330 as the hydraulic piston 1320 moves backward moves the pressurized medium provided to the second hydraulic circuit 1520 to the sixth hydraulic oil passage 1406, the eighth hydraulic oil passage 1408, The ninth hydraulic oil passage 1409 can be sequentially returned to the first pressure chamber 1330, and the pressurized medium supplied to the first hydraulic circuit 1510 is transferred to the seventh hydraulic oil passage 1407 and the eighth hydraulic oil passage 1408. , It can be recovered to the first pressure chamber 1330 through the ninth hydraulic oil passage 1409 sequentially. In addition, the negative pressure formed in the second pressure chamber 1340 as the hydraulic piston 1320 moves forward moves the pressurized medium provided to the second hydraulic circuit 1520 through the sixth hydraulic oil passage 1406, the eighth hydraulic oil passage 1408, and the second hydraulic oil passage 1408. 10 The hydraulic oil passage 1410 can be sequentially returned to the first pressure chamber 1340, and the pressurized medium provided to the first hydraulic circuit 1510 is transferred to the seventh hydraulic oil passage 1407, the eighth hydraulic oil passage 1408, It may be returned to the second pressure chamber 1340 through the tenth hydraulic oil passage 1410 sequentially.

The second hydraulic circuit 1520 of the hydraulic control unit 1400 controls the hydraulic pressure of the first and second wheel cylinders 21 and 22, which are two wheel cylinders 20 among the four wheels RR, RL, FR, and FL. , and the first hydraulic circuit 1510 may control the hydraulic pressure of the third and fourth wheel cylinders 23 and 24, which are the other two wheel cylinders 20.

The second hydraulic circuit 1520 may receive hydraulic pressure through the fourth hydraulic oil passage 1404 and discharge hydraulic pressure through the sixth hydraulic oil passage 1406 . To this end, as shown in FIG. 1, the fourth hydraulic oil passage 1404 and the sixth hydraulic oil passage 1406 are joined and then connected to the first wheel cylinder 21 and the second wheel cylinder 22. It can be provided by branching into. In addition, the first hydraulic circuit 1510 can receive hydraulic pressure through the fifth hydraulic oil passage 1405 and discharge the hydraulic pressure through the seventh hydraulic oil passage 1407. Accordingly, as shown in FIG. 1, After the fifth hydraulic oil passage 1405 and the seventh hydraulic oil passage 1407 are joined, they may be provided by branching into two oil passages connected to the third wheel cylinder 23 and the fourth wheel cylinder 24 . However, the connection of the hydraulic oil passages shown in FIG. 1 is an example for helping understanding of the present invention and is not limited to this structure, and the fourth hydraulic oil passage 1404 and the sixth hydraulic oil passage 1406 are respectively the second hydraulic oil passage 1404 and the sixth hydraulic oil passage 1406. It is connected to the side of the circuit 1520 and can be independently branched and connected to the first wheel cylinder 21 and the second wheel cylinder 22, and similarly, the fifth hydraulic oil passage 1405 and the seventh hydraulic oil passage 1407 It should be understood the same even if they are connected in various ways and structures, such as being connected to the side of the first hydraulic circuit 1510 and independently branched and connected to the third wheel cylinder 23 and the fourth wheel cylinder 24. something to do.

The first and second hydraulic circuits 1510 and 1520 have first to fourth inlet valves 1511a and 1511b respectively controlling the flow of pressurized medium toward the first to fourth wheel cylinders 21, 22, 23, and 24. , 1521a, 1521b). The first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b are disposed upstream of the first to fourth wheel cylinders 21, 22, 23, and 24, respectively, and are normally open and electronically controlled. It may be provided as a normal open type solenoid valve that operates to close the valve when an electrical signal is received from the unit 300.

The first and second hydraulic circuits 1510 and 1520 are connected in parallel to the first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b, and the first to fourth check valves 1513a, 1513b, and 1523a , 1523b). The first to fourth check valves 1513a, 1513b, 1523a, and 1523b are front and rear of the first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b on the first and second hydraulic circuits 1510 and 1520. may be provided in a bypass passage connecting the , and allow only the flow of the pressurized medium discharged from each wheel cylinder, and block the flow of the pressurized medium from the hydraulic pressure supply device 1300 to the wheel cylinders. The first to fourth check valves (1513a, 1513b, 1523a, 1523b) can quickly remove the hydraulic pressure of the pressurized medium applied to each wheel cylinder, and the first to fourth inlet valves (1511a, 1511b, 1521a, 1521b) ) does not operate normally, the hydraulic pressure of the pressurized medium applied to the wheel cylinder can be smoothly discharged.

The second hydraulic circuit 1520 may include first and second outlet valves 1522a and 1522b for controlling the discharge of pressurized medium to improve performance when the brakes of the first and second wheel cylinders 21 and 22 are released. can The first and second outlet valves 1522a and 1522b sense the braking pressure of the first and second wheel cylinders 21 and 22 and are selectively opened when decompression braking is required, such as in ABS dump mode, so that the first and second wheel The pressurized medium applied to the cylinders 21 and 22 may be discharged to the sub-reservoir 1100b through the second sub-reservoir passage 1720 described later. The first and second outlet valves 1522a and 1512b are provided as normally closed type solenoid valves that are normally closed and open when an electrical signal is received from the electronic control unit 300. It can be.

The first hydraulic circuit 1510 may include third and fourth outlet valves 1512a and 1512b for controlling the discharge of pressurized medium to improve performance when the braking of the third and fourth wheel cylinders 23 and 24 is released. can The third and fourth outlet valves 1512a and 1512b sense the braking pressure of the third and fourth wheel cylinders 23 and 24 and are selectively opened when decompression braking is required, such as in the ABS dump mode, so that the third and fourth wheel The pressurized medium applied to the cylinders 23 and 24 may be discharged to the sub-reservoir 1100b through a first sub-reservoir flow path 1710 described later. The third and fourth outlet valves 1512a and 1512b are provided as normally closed type solenoid valves that are normally closed and open when an electrical signal is received from the electronic control unit 300. It can be.

The outlet passage 1530 may be provided to connect the first hydraulic circuit 1510 and the sub reservoir 1100b to control the discharge of the pressurized medium from the third and fourth wheel cylinders 23 and 24 . A first cut valve 1531 may be provided in the outlet passage 1530 to control discharge of the pressurized medium. The first cut valve 1531 may be provided as a normal open type solenoid valve that is normally open and operates to close when an electrical signal is received from the electronic control unit 300 .

In the normal operation mode, which is a general braking situation, the first cut valve 1531 is controlled to be closed, so that the pressurized medium supplied to the first hydraulic circuit 1510 does not leak into the sub reservoir 110b and the third and fourth It can be stably supplied to the wheel cylinders 23 and 24.

The pedal simulator 1250 is provided to provide reaction force to the driver's foot force for operating the brake pedal 10 .

The pedal simulator 1250 has a front end connected to a first connection line 1610 to be described later, and a rear end connected to the sub reservoir 1100b through a simulator discharge passage 1251.

The pedal simulator 1250 has a simulation piston 1252a provided to be displaceable by a pressurized medium introduced through the first connection line 1610, and the volume is varied by displacement of the simulation piston 1252a, and the simulator discharges at the rear end. A simulation chamber 1252b communicating with the flow path 1251 and a simulation spring 1252c elastically supporting the simulation piston 1252a are included.

The simulation piston 1252a is provided to be displaceable within the simulation chamber 1252b by a pressurized medium introduced through the first connection line 1610 . Specifically, the hydraulic pressure of the pressurized medium introduced through the first connection line 1610 is transferred to the front surface (right side with reference to FIG. 1) of the simulation piston 1252a, and displacement occurs in the simulation piston 1252a, While the volume of the simulation chamber 1252b formed on the rear surface (left side with reference to FIG. 1) of the simulation piston 1252a decreases due to the displacement of the simulation piston 1252a, the pressurized medium accommodated in the simulation chamber 1252b It may be supplied to the sub-reservoir 1100b through the simulator discharge passage 1251. The simulation spring 1252c is compressed according to the displacement of the simulation piston 1252a by elastically supporting the simulation piston 1252a, and an elastic restoring force for this may be provided to the driver as a pedal feeling.

Meanwhile, in the drawing, the simulation spring 1252c is illustrated as being provided as a coil spring as an example, but other than that, as long as it can provide elastic force to the simulation piston 1252a as well as elastic restoring force, it can be made of various structures. For example, it may be made of a material such as rubber or made of various members capable of storing elastic force such as a plate spring.

The simulator discharge passage 1251 may be connected to the rear end of the pedal simulator 1250, so that one end communicates with the simulation chamber 1252b and the other end joins the first sub-reservoir passage 1710 described later. By connecting the simulation chamber 1252b and the sub-reservoir 1100b through this, the pressurized medium discharged from the simulation chamber 1252b is supplied to the sub-reservoir 1100b, or conversely, from the sub-reservoir 1100b to the simulation chamber 1252b. A pressurized medium can be supplied.

Describing the operation of the pedal simulator 1250, when the driver operates the brake pedal 10 and applies a foot force, the first master piston 1220 moves forward, and the pressurized medium in the first master chamber 1220a moves along the first connection line. It is supplied and pressurized to the front surface of the simulation piston 1252a via 1610. Accordingly, displacement occurs in the simulation piston 1252a to compress the simulation spring 1252c, and the elastic restoring force of the simulation spring 1252c may be provided to the driver as a pedal feeling. At this time, the pressurized medium filled in the simulation chamber 1252b is delivered to the sub-reservoir 1100b via the simulator discharge passage 1251 and the first sub-reservoir passage 1710. Thereafter, when the driver releases the pedal force of the brake pedal 10, the simulation spring 1252c expands by the elastic restoring force, and the simulation piston 1252a returns to its original position, and the pressurized medium pressurizes the front surface of the simulation piston 1252a. returns to the first master chamber 1220a through the first connection line 1610. The pressurized medium is supplied to the simulation chamber 1252b sequentially from the sub-reservoir 1100b through the first sub-reservoir passage 1710 and the simulator discharge passage 1251 so that the inside of the simulation chamber 1252b is filled with the pressurized medium again. can

As such, since the inside of the simulation chamber 1252b is always filled with pressurized medium, the friction of the simulation piston 1252a is minimized during operation of the pedal simulator 1250, thereby improving durability of the pedal simulator 1250 and external The inflow of foreign substances can be blocked from.

In addition, the pedal simulator 1250 of the present invention is connected to the first master chamber 1220a through the first connection line 1610 to form a pedal feeling, but does not have a simulator valve, so that the electronic control unit 300 is normal. It can always form a pedal feeling during operation or abnormal operation. Furthermore, the pedal simulator 1250 can maintain a pedal feeling to the driver even at the moment when the first electronic control unit 310 operates abnormally and is switched to the second electronic control unit 320, so that the driver feels discomfort due to kickback. There are advantages to reducing

Meanwhile, the sub-reservoir 1100b may be divided into a plurality of chambers by partition walls 1105b and provided. The sub-reservoir 1100b includes a plurality of sub-reservoir chambers 1101b, 1102b, and 1103b, and the plurality of sub-reservoir chambers 1101b, 1102b, and 1103b may be arranged side by side in a row. Specifically, the sub-reservoir 1100b includes a first sub-reservoir chamber 1101b disposed in the center, a second sub-reservoir chamber 1102b disposed on one side, and a third sub-reservoir chamber 1103b disposed on the other side. can be distinguished.

The partition walls 1105b may be provided between adjacent sub-reservoir chambers, and at least a part of the top of each partition wall 1105b may be open. As a result, the adjacent sub-reservoir chambers 1101b, 1102b, and 1103b communicate with each other so that the pressurized medium can move. For example, when a large amount of pressurized medium flows into the first sub-reservoir chamber 1101b, the pressurized medium passes through the top of the partition wall 1105b and enters the second sub-reservoir chamber 1102b or the third sub-reservoir chamber 1103b. can be conveyed

The first sub-reservoir chamber 1101b and the third sub-reservoir chamber 1103b may be connected to the first dump control unit and the second dump control unit, respectively, and the second sub-reservoir chamber 1102b may be connected to a third connection line 1630 to be described later. ) and the first and second hydraulic circuits 1510 and 1520, the pressurized medium can be transferred to each other.

As such, since the sub-reservoir 1100b is partitioned into the first to third sub-reservoir chambers 1101b, 1102b, and 1103b, the electronic brake system 1000 can be stably operated. For example, when the sub-reservoir 1100b is formed as one chamber and the capacity of the pressurized medium is insufficient, the pressurized medium can be stably supplied to the main reservoir 1100a as well as the dump control unit 1800 and the hydraulic pressure supply unit 1300. will not be able to Therefore, by providing the sub-reservoir 1100b by separating the first to third sub-reservoir chambers 1101b, 1102b, and 1103b, even when the pressurized medium cannot be supplied to one component element, the pressurized medium is supplied to another component element. Vehicle braking can be implemented.

The sub-reservoir passage is provided to hydraulically connect the first hydraulic circuit 1510, the second hydraulic circuit 1520, and the hydraulic pressure supply device 1300 to the sub-reservoir 1100b. The sub-reservoir flow path connects the first sub-reservoir flow path 1710 connecting the sub-reservoir 1100b and the rear end of the first hydraulic circuit 1510, and connects the sub-reservoir 1100b and the rear end of the second hydraulic circuit 1520. The second sub-reservoir flow path 1720, the third sub-reservoir flow path 1730 connecting the sub-reservoir 1100b and the first dump controller, and the fourth sub-reservoir connecting the sub-reservoir 1100b and the second dump control unit. A flow path 1740 may be included.

The first sub-reservoir flow path 1710 has one end connected to the second sub-reservoir chamber 1102b of the sub-reservoir 1100b and the other end connected to the third and fourth outlet valves 1522a and 1522b of the first hydraulic circuit 1510. ), but the simulator discharge passage 1251 may join the middle part. In addition, the second sub-reservoir flow path 1720 has one end connected to the second sub-reservoir chamber 1102b of the sub-reservoir 1100b and the other end connected to the first and second outlet valves 1512a of the second hydraulic circuit 1520, 1512b) can be connected to the downstream side. In addition, the third sub-reservoir flow path 1730 has one end connected to the third sub-reservoir chamber 1103b of the sub-reservoir 1100b and the other end connected to the first dump controller side, and a fourth sub-reservoir flow path 1740. may have one end connected to the first sub-reservoir chamber 1101b of the sub-reservoir 1100b and the other end connected to the second dump control unit.

The inspection valve 1900 is provided to diagnose or determine whether the master cylinder 1200 is leaking. The inspection valve 1900 may be provided at a front end of the pedal simulator 1250 on a first connection line 1610 to be described later to control the flow of a pressurized medium. In the inspection mode, the inspection valve 1900 blocks the discharge of the pressurized medium from the first master chamber 1220a through the first connection line 1610, thereby inspecting whether the master cylinder 1200 is leaking. To this end, the inspection valve 1900 may be provided as a normal open type solenoid valve that is normally open and operates to open when an electrical signal is received from the electronic control unit.

The second block 200 includes a circuit pressure sensor PS1 that detects the hydraulic pressure of the pressurized medium provided by the hydraulic pressure supply device 1300 and a cylinder pressure sensor PS2 that detects the hydraulic pressure of the second master chamber 1230a. can include The circuit pressure sensor PS1 is provided on the side of the first hydraulic circuit 1510 and can detect the hydraulic pressure of the pressurized medium generated and provided from the hydraulic pressure supply device 1300 and transmitted to the first hydraulic circuit 1510, The pressure sensor PS2 may be provided between the second master chamber 1230a and the second cut valve 1621 on a second connection line 1620 to be described later and detect the hydraulic pressure of the pressurized medium in the second master chamber 1230a. . The pressure numerical information of the pressurized medium detected by the circuit pressure sensor (PS1) and the cylinder pressure sensor (PS2) can be transmitted to the electronic control unit (300), and the electronic control unit (300) senses it from the circuit pressure sensor (PS1). Based on the hydraulic pressure value detected by the cylinder pressure sensor PS2 and the hydraulic pressure value detected by the cylinder pressure sensor PS2, an inspection mode may be performed or driving or braking information of the vehicle may be obtained.

In addition, the second block 200 includes a first cut valve 1531 provided in the outlet passage 1530 to control the flow of the pressurized medium, and a second cut valve 1531 provided in the second connection line 1620 to control the flow of the pressurized medium. A cut valve 1621 may be included. A detailed description of this will be described later.

The connection line 1600 is provided to connect the first block 100 and the second block 200 that are spaced apart from each other.

The connection line 1600 connects the master cylinder 1200 of the first block 100 to the pedal simulator 1250 side of the hydraulic control unit 1400 and the first connection line 1610 and the master cylinder 1200. The second connection line 1620 connected to the second hydraulic circuit 1520 side of the hydraulic control unit 1400, the main reservoir 1100a of the first block 100 and the sub reservoir of the second block 200 ( 1100b) may include a third connection line 1630 connecting each other.

One end of the first connection line 1610 may be connected to the first master chamber 1220a of the master cylinder 1200 and the other end may be connected to the front end of the pedal simulator 1250.

The second connection line 1620 has one end connected to the second master chamber 1230a of the master cylinder 1200 and the other end downstream of the first and second inlet valves 1511a and 1512a of the second hydraulic circuit 1520. Alternatively, it may be connected to the rear end side.

A second cut valve 1621 is provided in the second connection line 1620 to control the flow of pressurized medium between the second master chamber 1230a of the master cylinder 1200 and the second hydraulic circuit 1520 . The second cut valve 1621 may be provided as a normal open type solenoid valve that is normally open but operates to close when a closing signal is received from the electronic control unit 300 .

In the normal operation mode, which is a general braking situation, the second cut valve 1621 is controlled to be closed, so that the pressurized medium accommodated in the second master chamber 1230a operates in the second hydraulic circuit (despite the effort of the brake pedal 10). 1520) is not transmitted to the side. In addition, in the normal operation mode, the second cut valve 1621 is controlled to be closed, so that the hydraulic pressure of the pressurized medium provided from the hydraulic pressure supply device 1300 leaks to the master cylinder 1200 side along the second connection line 1620. and can be stably supplied toward the wheel cylinders 21, 22, 23, and 24.

However, in the fallback mode, which is switched when the electronic control unit 300 is inoperable, the second cut valve 1621 is left open, so that the pressurized medium discharged from the second master chamber 1230a of the master cylinder 1200 may be supplied to the first and second wheel cylinders 21 and 22 through the second connection line 1620 to realize braking.

The third connection line 1630 may have one end communicated with the main reservoir 1100a and the other end communicated with the sub reservoir 1100b. The third connection line 1630 may promote smooth supply of the pressurized medium to each part element by allowing the pressurized medium to be transferred between the reservoirs when the pressurized medium is excessively large or small in one reservoir.

The first connection line 1610 and the second connection line 1620 may be provided with a pipe having a predetermined strength, and the third connection line 1630 may be provided with a hose having elasticity. The first connection line 1610 and the second connection line 1620 are provided as pipes having strength capable of withstanding the hydraulic pressure, as the pressurized medium in which the hydraulic pressure is formed is transmitted from the first and second master chambers 1220a and 1230a. Product durability and performance can be promoted. Meanwhile, the third connection line 1630 is provided in connection with the main reservoir 1100a or the sub reservoir 1100b having an atmospheric pressure level, and a pressurized medium without hydraulic pressure is transmitted. Therefore, it may be provided with a hose or the like having elasticity to promote ease of installation according to the arrangement position of the first block 100 and the second block 200. The first connection line 1610 and the second connection line 1620 may be installed on the vehicle body by a fastening member (not shown) having a predetermined restoring force so as to maintain connectivity despite an impact such as a vehicle accident.

Hereinafter, the operation of the electronic brake system 1000 according to the first embodiment of the present invention will be described.

Since the electronic brake system 1000 according to the first embodiment of the present invention includes a plurality of electronic control units 310 and 320, the first electronic control unit 310 and the second electronic control unit 320 operate normally. It can operate under the control of Specifically, the electronic brake system 1000 is controlled by the first normal mode controlled by the first electronic control unit 310 and the second electronic control unit 320 when the first electronic control unit 310 is abnormally operated. It can operate in the second normal mode.

At this time, when the electronic brake system 1000 according to the first embodiment of the present invention is switched from the first normal mode to the second normal mode, that is, when the first electronic control unit 310 operates abnormally, it recognizes and controls the abnormal operation. 2 In the state before the electronic control unit 320 operates, it can operate in a transitional state, which is a temporary abnormal state.

In addition, the electronic brake system 1000 according to the first embodiment of the present invention may operate in a fallback mode when all of the plurality of electronic control units 300 operate abnormally.

That is, the electronic brake system 1000 according to the first embodiment of the present invention operates in the first normal mode to be controlled by the first electronic control unit 310 during normal operation, and then the first electronic control unit 310 In the case of abnormal operation, it operates in a switched state until the second electronic control unit 320 operates, and can operate sequentially so that the second electronic control unit 320 operates in the second normal mode.

2 is a hydraulic circuit diagram showing the operation of the electronic brake system 1000 in the first normal mode according to the first embodiment of the present invention.

Referring to FIG. 2 , in the first normal mode of the electronic brake system 1000 according to the first embodiment of the present invention, various devices and valves operate normally, and various devices and valves operate in the first electronic control unit 310. can be controlled by

In the first normal mode, when the driver steps on the brake pedal 10, the pedal sensor 11 detects the pedal force and sends an electrical signal to the first electronic control unit 310. Accordingly, the first electronic control unit 310 transmits electrical signals to various devices and valves to generate hydraulic pressure with the hydraulic pressure supply device 1300, and the hydraulic control unit 1400, the first and second hydraulic circuits 1510 and 1520 ) through which a pressurized medium is provided to the wheel cylinders 21, 22, 23, and 24.

In the first normal mode, the first cut valve 1531 provided in the outlet passage 1530 is switched to close, so that the hydraulic pressure acting on the first hydraulic circuit 1510 does not leak, and the hydraulic pressure supply device 1300 controls the wheel cylinder. The second cut valve 1621 provided in the second connection line 1620 to realize braking by (21, 22, 23, 24) is switched to close, and the pressurized medium discharged from the master cylinder 1200 is transferred to the wheel cylinder 20 ) is prevented from being transmitted to the side.

When a pedal force is applied to the brake pedal 10, the first master piston 1220 moves forward, and the pressurized medium accommodated in the first master chamber 1220a is transmitted to the pedal simulator 1250 through the first connection line 1610. Accordingly, the simulation spring 1252c is elastically deformed by the displacement of the simulation piston 1252a, and the elastic restoring force of the simulation spring 1252c is provided to the driver as a pedal feeling. At this time, the pressurized medium accommodated in the simulation chamber 1252b may be supplied to the sub reservoir 1100b through the simulator discharge passage 1251 . In addition, the second master chamber 1230a is sealed as the second cut valve 1621 is closed, and displacement of the second master piston 1230 does not occur.

3 is a hydraulic circuit diagram showing the operation of the electronic brake system 1000 according to the first embodiment of the present invention in a transition state.

Referring to FIG. 3 , the electronic brake system 1000 according to the first embodiment of the present invention has a redundancy function by including a plurality of electronic control units 300 as described above.

Specifically, it operates in the first normal mode controlled by the first electronic control unit 310 at normal times, and is controlled by the second electronic control unit 320 when the first electronic control unit 310 malfunctions or operates abnormally. It can operate in the second normal mode.

At this time, the first electronic control unit 310 may operate abnormally and temporarily operate in an abnormally operating switching state before the second electronic control unit 320 operates. Although this transition state may be about 10 ms to 100 ms, since the driver feels discomfort from kickback as the driver temporarily operates abnormally within 10 ms, kickback reduction is required in the transition state.

In the transition state, various devices and valves are provided in an abnormal state, and as the operation of the hydraulic pressure supply device 1300 that provided hydraulic pressure is stopped, the pressure medium acting on each of the wheel cylinders 21, 22, 23, and 24 The hydraulic pressure is released and may leak.

Specifically, as the first cut valve 1531 of the outlet passage 1530 is switched to an open state, pressure applied to the third and fourth wheel cylinders 23 and 24 provided in the first hydraulic circuit 1510 The medium may be delivered to the sub reservoir 1100b through the outlet passage 1530.

In addition, as the second cut valve 1621 of the second connection line 1620 is switched to an open state, the pressurized medium acting on the first and second wheel cylinders 21 and 22 of the second hydraulic circuit 1520 may leak into the second master chamber 1230a through the second connection line 1620 . Accordingly, hydraulic pressure acts on the second master piston 1230 in a retracting direction, so that fine kickback may be induced.

On the other hand, the pedal simulator 1250 is connected to the first master chamber 1220a through the first connection line 1610 to maintain a pedal feeling in the first master piston 1220 and the brake pedal 10 connected thereto, thereby preventing kickback. can be significantly reduced.

That is, the electronic brake system 1000 according to the first embodiment of the present invention always connects the first master chamber 1220a and the pedal simulator 1250 in normal and abnormal operating conditions, thereby determining whether the electronic control unit 300 has failed. Regardless, there is an advantage in maintaining the pedal feel and reducing the kickback that occurs in the transition state.

4 is a hydraulic circuit diagram showing the operation of the electronic brake system 1000 in the second normal mode according to the first embodiment of the present invention.

Referring to FIG. 4 , the electronic brake system 1000 according to the first embodiment of the present invention passes through the first normal mode and the transition state as described above, and then the second normal mode controlled by the second electronic control unit 320. mode can work.

In the second normal mode, when the first electronic control unit 310 fails or operates abnormally, the second electronic control unit 320 replaces the first electronic control unit 310 and controls various devices and valves to operate normally. can do.

Since the operations of various devices and valves in the second normal mode are the same as those in the first normal mode, descriptions thereof are omitted to prevent duplication.

5 is a hydraulic circuit diagram showing the operation of the electronic brake system 1000 in the fallback mode according to the first embodiment of the present invention.

Referring to FIG. 5 , in the fallback mode, the electronic brake system 1000 according to the first embodiment of the present invention is controlled in an initial braking state in which various devices and valves are in a non-operating state. This fallback mode may be operated when all of the plurality of electronic control units 300 are abnormally operated.

In the fallback mode, when the driver applies a pressing force to the brake pedal 10, the first master piston 1220 connected to the brake pedal 10 advances and displacement occurs. At this time, the pressurized medium accommodated in the first master chamber 1220a by the advancement of the first master piston 1220 is transferred to the pedal simulator 1250 through the first connection line 1610 to form a pedal feeling. In addition, the pressurized medium filled in the simulation chamber 1252b may be delivered to the sub-reservoir 1100b via the simulator discharge passage 1251 and the first sub-reservoir passage 1710 .

At the same time, the displacement of the first master piston 1220 or the hydraulic pressure of the first master chamber 1220a advances the second master piston 1230 to generate displacement, and the pressurized medium accommodated in the second master chamber 1230a It is transferred to the second hydraulic circuit 1520 and the first and second wheel cylinders 21 and 22 through the second connection line 1620 to realize braking.

Thus, in the electronic brake system 1000 according to the first embodiment of the present invention, hydraulic pressure transmitted from the master cylinder 1200 is transmitted to the wheel cylinders 21 and 22 even when the plurality of electronic control units 300 fail or operate abnormally. This can be transmitted to improve braking stability.

6 is a hydraulic circuit diagram showing an electronic brake system 1000 according to a modified example of the first embodiment of the present invention.

Referring to FIG. 6 , the electronic brake system 1000 according to the modified example of the first embodiment of the present invention includes a balance hydraulic oil passage 1411 hydraulically connecting a first hydraulic circuit 1510 and a second hydraulic circuit 1520 to each other. And, a balance valve 1439 may be further included.

The balance valve 1439 may be provided as a normal open type solenoid valve that is normally open but closes when an electrical signal is received from the electronic control unit 300 .

A modified example of the first embodiment of the present invention transfers some of the hydraulic pressure provided to the second hydraulic circuit 1520 to the first hydraulic circuit 1510 through the second connection line 1620 in the fallback mode described above, so that four Hydraulic pressure can be uniformly provided to the wheel cylinders 21, 22, 23, and 24.

Hereinafter, an electronic brake system 2000 according to a second embodiment of the present invention will be described.

7 is a hydraulic circuit diagram showing an electronic brake system 2000 according to a second embodiment of the present invention.

Referring to FIG. 7 , the electronic brake system 2000 according to the second embodiment of the present invention includes a first block 100 including a master cylinder 2200, a pedal simulator 2250, and a hydraulic pressure supply device 1300. And a second block 200 including a hydraulic control unit 1400 and spaced apart from the first block 100, a plurality of electronic control units 300, one end connected to the first block 100 and the other end A connection line 2600 connected to the second block 200 may be provided.

Among the descriptions of the electronic brake system 2000 according to the second embodiment of the present invention to be described below, the electronic brake system 1000 according to the first embodiment of the present invention described above, except for cases in which separate reference numerals are additionally described. ), the description is omitted to prevent duplication of content.

The first block 100 is connected to and interlocked with the brake pedal 10, and a mechanical part is disposed, and the second block 200 operates electronically, such as valves and sensors whose operations are controlled by an electronic control unit (ECU). and an electronic unit to be controlled. The first block 100 and the second block 200 are disposed apart from each other in the vehicle but may be hydraulically connected by a plurality of connection lines 2600, thereby improving the vehicle mountability of the electronic brake system 1000 and In addition, it is possible to achieve efficient space arrangement by promoting the degree of freedom in vehicle design.

The mechanical part includes parts that operate in conjunction with the brake pedal 10 regardless of the control signal of the electronic control unit or operate by separate manipulation, and may be disposed in the first block 100.

The first block 100 includes a main reservoir 2100a in which pressurized medium such as brake oil is stored, and a master cylinder 2200 that pressurizes and discharges pressurized medium such as brake oil accommodated inside according to the pedal force of the brake pedal 10 , It may include a main reservoir flow path 2110 connecting the main reservoir 2100a and the master cylinder 2200.

The master cylinder 2200 is configured to have a hydraulic chamber, and can pressurize and discharge an internal pressurized medium. The master cylinder 2200 may include a master chamber 2220a and a master piston 2220 provided in the master chamber 2220a. The master chamber 2220a may be formed at an inlet side of the cylinder block 2210 to which the brake pedal 10 is connected, and the master piston 2220 may be reciprocally accommodated in the master chamber 2220a.

A pressurized medium may be introduced into and discharged from the master chamber 2220a through the first hydraulic port 2280a and the second hydraulic port 2280b. The first hydraulic port 2280a is connected to a main reservoir flow path 2110 to be described later, so that pressurized medium flows from the main reservoir 2100a to the master chamber 2220a, and one is provided in front and rear of the first hydraulic port 2280a. A pair of sealing members may be provided to seal the master chamber 2220a. The second hydraulic port 2280b is connected to a first connection line 2610 to be described later so that the pressurized medium in the master chamber 2220a is discharged to the first connection line 2610 or vice versa from the first connection line 2610 to the master chamber. A pressurized medium may flow into the chamber 2220a.

The master piston 2220 is accommodated and provided in the master chamber 2220a, and pressurizes the pressurized medium accommodated in the master chamber 2220a by moving forward, or negative pressure can be formed inside the master chamber 2220a by moving backward. Specifically, when the master piston 2220 moves forward, as the volume of the master chamber 2220a decreases, the pressurized medium present in the master chamber 2220a may be pressurized to form hydraulic pressure. Conversely, as the volume of the master chamber 2220a increases when the master piston 2220 moves backward, the pressurized medium present in the master chamber 2220a may be decompressed, and at the same time negative pressure is applied to the master chamber 2220a. can form

The piston spring 2220b is provided to elastically support the master piston 2220 . To this end, the piston spring 2220b may be disposed between the front surface of the master piston 2220 and the inner surface of the cylinder block 2210. When a displacement occurs in the master piston 2220 according to an operation such as braking, the piston springs 2220b are compressed, respectively, and then released by an operation such as braking. ) can each return to its original position.

The main reservoir 2100a may accommodate and store a pressurized medium therein. The main reservoir 2100a may be connected to component elements such as the master cylinder 2200 and a second connection line 2620 to be described later to supply or receive a pressurized medium.

The main reservoir 2100a may be divided into a plurality of chambers by partition walls 2105a and provided. The main reservoir 2100a includes a plurality of main reservoir chambers 2101a and 2102a, and the plurality of main reservoir chambers 2101a and 2102a may be arranged side by side around the partition wall 2105a. Specifically, the main reservoir 2100a may be divided into a first main reservoir chamber 2101a disposed on one side and a second main reservoir chamber 2102a disposed on the other side.

The partition wall 2105a may be provided between the adjacent main reservoir chambers 2101a and 2102a, and at least a part of an upper end of each partition wall 2105a may be opened. As a result, the adjacent main reservoir chambers 2101a and 2102a communicate with each other so that the pressurized medium can move. For example, when a large amount of pressurized medium flows into the first main reservoir chamber 2101a, the pressurized medium may pass through the upper end of the partition wall 2105a and be delivered to the second main reservoir chamber 2102a.

The first main reservoir chamber 2101a may be connected to the main reservoir passage 2110 to supply or receive pressurized medium toward the master cylinder 2200 . In addition, the second main reservoir chamber 2102a may be connected to a second connection line 2620 to be described later to supply a pressurized medium to the sub-reservoir 2100b or receive a pressurized medium from the sub-reservoir 2100b.

As such, since the main reservoir 2100a is partitioned into the first and second main reservoir chambers 2101a and 2102a, stable operation of the electronic brake system 2000 can be promoted. For example, when the main reservoir 2100a is formed as one chamber and the capacity of the pressurized medium is insufficient, the pressurized medium cannot be stably supplied to the master cylinder 2200 as well as the sub reservoir 2100b. Therefore, the main reservoir 2100a has a second main reservoir chamber 2102a connected to the sub reservoir 2100b of the second block 200 and a first main reservoir chamber 2101a connected to the master cylinder 2200 side. By providing them separately, braking of the vehicle can be realized by supplying the pressurized medium to another part element even when the pressurized medium cannot be supplied to one part element.

The main reservoir passage 2110 is provided to hydraulically connect the master cylinder 2200 and the main reservoir 2100a. The main reservoir flow path 2110 connects the master chamber 2220a and the first main reservoir chamber 2101a of the main reservoir 2100a. To this end, one end of the main reservoir passage 2110 may communicate with the master chamber 2220a of the master cylinder 2200, and the other end may communicate with the first main reservoir chamber 2101a of the main reservoir 2100a.

The pedal folding device 2260 may move the brake pedal 10 to improve driver's living comfort and vehicle maneuverability according to the operating conditions of the vehicle. Specifically, since braking of the vehicle is automatically implemented during autonomous driving, the driver's operation of the brake pedal 10 is unnecessary. Therefore, the electronic brake system 2000 according to the present embodiment moves the brake pedal 10 forward by the pedal folding device 2260 to provide a driver with comfortable living, thereby moving the brake pedal 10 from the passenger space of the vehicle. can be stored. Contrary to this, when the vehicle is operated and braked by the driver, the brake pedal 10 is reversed so that the driver can easily operate the brake pedal 10 so that the brake pedal 10 is moved to the passenger space of the vehicle in which the driver is riding. can be exposed. In addition, the position where the brake pedal 10 can be easily operated may vary according to the driver's body size, and the driver may require comfortable living even when the vehicle is stopped, so the pedal folding device 2260 is ) can be adjusted to a suitable position.

The pedal folding device 2260 is disposed on the first block 100 and may be provided between the master piston 2220 and the input rod of the brake pedal 10 . The pedal folding device 2260 includes an actuator 2261 that generates and provides power for moving the brake pedal 10 or the input rod, and a gear unit that converts the rotational power of the actuator 2261 into linear motion of the input rod ( 2262) may be included. The actuator 2261 may include a driving motor that generates power by receiving power from a battery (not shown) of the vehicle, and the gear unit 2262 receives the rotational force of the driving motor to operate the input rod and the brake pedal 10 ) can generate forward and backward movements. The gear unit 2262 may be provided with various gear structures for converting rotational motion into linear motion. For example, a first screw thread formed on an outer circumferential surface of an input rod and a drive shaft of a driving motor are engaged with the first screw thread. It may have a second screw thread, but is not limited thereto.

The electronic unit includes parts and elements electronically operated and controlled by control signals from a plurality of electronic control units (ECUs), and may be disposed in the second block 200 .

The second block 200 includes a sub-reservoir 2100b for auxiliary storage of pressurized medium inside, a pedal simulator 2250 for providing a reaction force against the driver's brake pedal 10 pedal force, and displacement of the brake pedal 10. The hydraulic pressure supply device 2300 receives the driver's will to brake as an electrical signal by the pedal displacement sensor 11 that senses and generates hydraulic pressure of the pressurized medium through mechanical operation, and the hydraulic pressure provided by the hydraulic pressure supply device 2300 and the hydraulic control unit 2400 for controlling the hydraulic pressure transmitted to the first to fourth wheel cylinders 21, 22, 23, 24, the sub reservoir 2100b and the hydraulic pressure supply device 2300 are hydraulically connected, but these A dump control unit 2800 controlling the flow of pressurized medium between the dump control unit 2800 and a plurality of sub-reservoir passages 2710 and 2720 connecting the sub-reservoir 2100b to the first and second hydraulic circuits 2510 and 2520 and the dump control unit 2800. , 2730, 2740), a plurality of cut valves 411 and 412a provided in the connection line to control the flow of the pressurized medium, and a circuit pressure sensor (PS1) for detecting the hydraulic pressure of the pressurized medium provided by the hydraulic pressure supply device 2300 can include

The electronic control unit 300 may receive electrical signals sensed by various sensors, transmit electrical signals to various devices and component elements such as valves, and determine whether or not there is an abnormality.

The electronic control unit 300 may be provided in plurality and have a redundancy function. Specifically, the electronic control unit 300 may include a first electronic control unit 310 and a second electronic control unit 320, and the first electronic control unit 310 controls various devices and valves in normal times. And, the second electronic control unit 320 can operate to control various devices and valves instead of the first electronic control unit 310 when the first electronic control unit 310 is abnormally operated. That is, when the first electronic control unit 310 operates abnormally, the sensor recognizes whether there is an abnormality, blocks the signal of the first electronic control unit 310, and the second electronic control unit 320 operates various devices and valves. can work to control.

The pedal simulator 2250 is provided to provide reaction force to the driver's foot force for operating the brake pedal 10 .

The pedal simulator 2250 has a front end connected to a first connection line 2610 to be described later, and a rear end connected to the sub reservoir 1100b through a simulator discharge passage 2251.

The pedal simulator 2250 has a simulation piston 2252a provided to be displaceable by a pressurized medium introduced through the first connection line 2610, and the volume is varied by displacement of the simulation piston 2252a, and the simulator discharges at the rear end. A simulation chamber 2252b communicating with the flow path 2251 and a simulation spring 2252c elastically supporting the simulation piston 2252a are included.

The simulation piston 2252a is displaceable within the simulation chamber 2252b by a pressurized medium introduced through the first connection line 2610 . Specifically, the hydraulic pressure of the pressurized medium introduced through the first connection line 2610 is transmitted to the front surface of the simulation piston 2252a to generate displacement in the simulation piston 2252a, and the displacement of the simulation piston 2252a As the volume of the simulation chamber 2252b formed on the rear surface of the simulation piston 2252a decreases, the pressurized medium accommodated in the simulation chamber 2252b may be supplied to the sub-reservoir 1100b through the simulator discharge passage 2251. have. The simulation spring 2252c is compressed according to the displacement of the simulation piston 2252a by elastically supporting the simulation piston 2252a, and an elastic restoring force for this may be provided to the driver as a pedal feeling.

Meanwhile, in the drawings, as an example, the simulation spring 2252c is illustrated as being provided as a coil spring, but other than that, as long as it can provide an elastic force to the simulation piston 2252a and at the same time provide an elastic restoring force, it can be made of various structures. For example, it may be made of a material such as rubber or made of various members capable of storing elastic force such as a plate spring.

The simulator discharge passage 2251 may be connected to the rear end of the pedal simulator 2250, so that one end communicates with the simulation chamber 2252b and the other end joins the first sub-reservoir passage 2710 described below. By connecting the simulation chamber 2252b and the sub-reservoir 1100b through this, the pressurized medium discharged from the simulation chamber 2252b is supplied to the sub-reservoir 1100b, or conversely, from the sub-reservoir 1100b to the simulation chamber 2252b. A pressurized medium can be supplied.

Describing the operation of the pedal simulator 2250, when the driver operates the brake pedal 10 and applies a foot force, the master piston 2220 moves forward and the pressurized medium in the master chamber 2220a passes through the first connection line 2610. Through it, it is supplied and pressurized to the front surface of the simulation piston 2252a. Accordingly, displacement occurs in the simulation piston 2252a, compressing the simulation spring 2252c, and the elastic restoring force of the simulation spring 2252c may be provided to the driver as a pedal feeling. At this time, the pressurized medium filled in the simulation chamber 2252b is delivered to the sub-reservoir 1100b via the simulator discharge passage 2251 and the first sub-reservoir passage 2710. Thereafter, when the driver releases the pressing force of the brake pedal 10, the simulation spring 2252c expands by the elastic restoring force, and the simulation piston 2252a returns to its original position, and the pressurized medium pressurizes the front surface of the simulation piston 2252a. returns to the master chamber 2220a through the first connection line 2610. The pressurized medium is supplied to the simulation chamber 2252b sequentially from the sub-reservoir 1100b through the first sub-reservoir passage 2710 and the simulator discharge passage 2251 so that the inside of the simulation chamber 2252b is filled with the pressurized medium again. can

As such, since the inside of the simulation chamber 2252b is always filled with pressurized medium, the friction of the simulation piston 2252a is minimized during operation of the pedal simulator 2250, thereby improving durability of the pedal simulator 2250 and external The inflow of foreign substances can be blocked from.

The sub-reservoir passage is provided to hydraulically connect the first hydraulic circuit 1510, the second hydraulic circuit 1520, and the hydraulic pressure supply device 1300 to the sub-reservoir 1100b. The sub-reservoir flow path connects the first sub-reservoir flow path 2710 that connects the sub-reservoir 1100b and the rear end of the first hydraulic circuit 1510, and connects the sub-reservoir 2100b and the rear end of the second hydraulic circuit 2520. The second sub-reservoir flow path 2720, the third sub-reservoir flow path 1730 connecting the sub-reservoir 2100b and the first dump control unit, and the fourth sub-reservoir connecting the sub-reservoir 2100b and the second dump control unit. A flow path 1740 may be included.

The second sub-reservoir flow path 2720 has one end connected to the second sub-reservoir chamber 2102b of the sub-reservoir 1100b and the other end connected to the first and second outlet valves 2522a and 2522b of the second hydraulic circuit 2520. ) can be connected to the downstream side of In addition, the first sub-reservoir flow path 2710 has one end connected to the second sub-reservoir chamber 2102b of the sub-reservoir 1100b and the other end connected to the third and fourth outlet valves 2512a, It is connected to the downstream side of 2512b), but the simulator discharge passage 2251 may join the middle part. In addition, the third sub-reservoir flow path 2730 has one end connected to the third sub-reservoir chamber 2103b of the sub-reservoir 2100b and the other end connected to the first dump controller side, and a fourth sub-reservoir flow path 2740 may have one end connected to the first sub-reservoir chamber 2101b of the sub-reservoir 2100b and the other end connected to the second dump control unit.

The second block 200 includes a first circuit pressure sensor PS11 that detects the hydraulic pressure of the pressurized medium transmitted from the hydraulic pressure supply device 1300 to the second hydraulic circuit 1520, and a first circuit pressure sensor PS11 from the hydraulic pressure supply device 1300. A second circuit pressure sensor PS12 for sensing the hydraulic pressure of the pressurized medium transmitted to the hydraulic circuit 1510 may be included. The first outlet passage 2530 may be provided to connect the first hydraulic circuit 1510 and the first sub-reservoir passage 2710 to control the discharge of the pressurized medium from the third and fourth wheel cylinders 23 and 24. have. A first cut valve 2531 may be provided in the first outlet passage 2530 to control discharge of the pressurized medium. The first cut valve 2531 may be provided as a normal open type solenoid valve that is normally open and operates to close when an electrical signal is received from the electronic control unit 300.

The second outlet passage 2540 may be provided to connect the second hydraulic circuit 1520 and the sub reservoir 1100b to control the discharge of the pressurized medium from the first and first wheel cylinders 21 and 22 . A second cut valve 2541 may be provided in the second outlet passage 2540 to control discharge of the pressurized medium. The second cut valve 2541 may be provided as a normal open type solenoid valve that is normally open and operates to close when an electrical signal is received from the electronic control unit 300.

The connection line 2600 is provided to hydraulically connect the first block 100 and the second block 200 that are spaced apart from each other.

The connection line 2600 is a first connection line 2610 connecting the master cylinder 2200 of the first block 100 to the pedal simulator 2250 side, and the main reservoir 2100a of the first block 100 and A second connection line 2630 connecting the sub reservoirs 1100b of the second block 200 to each other may be included.

The first connection line 2610 may have one end connected to the master chamber 2220a of the master cylinder 2200 and connected to the front end of the pedal simulator 2250.

The second connection line 2630 may have one end communicated with the main reservoir 2100a and the other end communicated with the sub reservoir 1100b. The second connection line 2630 may promote smooth supply of the pressurized medium to each component element by allowing the pressurized medium to be transferred between the reservoirs when the pressurized medium is excessively large or small in the reservoir on one side.

The first connection line 2610 may be provided with a pipe having a predetermined strength, and the second connection line 2630 may be provided with a hose having elasticity. The second connection line 2630 is provided with a pipe having strength capable of withstanding the hydraulic pressure as the pressurized medium in which the hydraulic pressure is formed is transmitted from the master chamber 2220a, so that durability and performance of the product can be promoted. Meanwhile, the second connection line 2630 is provided to be connected to the main reservoir 2100a or the sub reservoir 2100b having an atmospheric pressure level, and a pressurized medium without hydraulic pressure is transmitted. Therefore, it may be provided with a hose or the like having elasticity to promote ease of installation according to the arrangement position of the first block 100 and the second block 200. The first connection line 2610 and the second connection line 2630 may be installed on the vehicle body by a fastening member (not shown) having a predetermined restoring force so as to maintain connectivity despite an impact such as a vehicle accident.

Hereinafter, the operation of the electronic brake system 2000 according to the second embodiment of the present invention will be described.

Since the electronic brake system 2000 according to the second embodiment of the present invention includes a plurality of electronic control units 310 and 320, the first electronic control unit 310 and the second electronic control unit 320 operate normally. It can operate under the control of Specifically, the electronic brake system 2000 is controlled by the first normal mode controlled by the first electronic control unit 310 and the second electronic control unit 320 when the first electronic control unit 310 is abnormally operated. It can operate in the second normal mode.

At this time, when the electronic brake system 2000 according to the second embodiment of the present invention is switched from the first normal mode to the second normal mode, that is, when the first electronic control unit 310 operates abnormally, it recognizes and controls the abnormal operation. 2 In the state before the electronic control unit 320 operates, it can operate in a transitional state, which is a temporary abnormal state.

That is, the electronic brake system 2000 according to the second embodiment of the present invention operates in the first normal mode to be controlled by the first electronic control unit 310 during normal operation, and then the first electronic control unit 310 In the case of abnormal operation, it operates in a switched state until the second electronic control unit 320 operates, and can operate sequentially so that the second electronic control unit 320 operates in the second normal mode.

8 is a hydraulic circuit diagram showing the operation of the electronic brake system 2000 in the first normal mode according to the second embodiment of the present invention.

Referring to FIG. 8 , in the first normal mode of the electronic brake system 2000 according to the second embodiment of the present invention, various devices and valves operate normally, and various devices and valves operate in the first electronic control unit 310. can be controlled by

In the first normal mode, when the driver steps on the brake pedal 10, the pedal sensor 11 detects the pedal force and sends an electrical signal to the first electronic control unit 310. Accordingly, the first electronic control unit 310 transmits an electrical signal to generate hydraulic pressure to the hydraulic pressure supply device 1300 and to the wheel cylinder through the hydraulic control unit 1400 and the first and second hydraulic circuits 1510 and 1520. (21,22,23,24) provides a pressurized medium.

In the first normal mode, the first cut valve 2531 and the second cut valve 2541 provided in the first outlet passage 2530 and the second outlet passage 2540, respectively, are closed and switched to operate the first hydraulic circuit 1510. And, the hydraulic pressure acting on the second hydraulic circuit 1520 does not leak, and braking can be implemented by the wheel cylinders 21, 22, 23, and 24 by the hydraulic pressure supply device 1300.

When a pedal force is applied to the brake pedal 10, the master piston 2220 moves forward and the pressurized medium accommodated in the master chamber 2220a is transferred to the pedal simulator 2250 through the first connection line 2610. Accordingly, the simulation spring 2252c is elastically deformed by the displacement of the simulation piston 2252a, and the elastic restoring force of the simulation spring 2252c is provided to the driver as a pedal feeling. At this time, the pressurized medium accommodated in the simulation chamber 2252b may be supplied to the sub reservoir 1100b through the simulator discharge passage 2251 .

9 is a hydraulic circuit diagram showing the operation of the electronic brake system 2000 according to the second embodiment of the present invention in a switching state.

Referring to FIG. 9 , the electronic brake system 2000 according to the second embodiment of the present invention has a redundancy function by having a plurality of electronic control units 300 as described above.

Specifically, it operates in the first normal mode controlled by the first electronic control unit 310 at normal times, and is controlled by the second electronic control unit 320 when the first electronic control unit 310 malfunctions or operates abnormally. It can operate in the second normal mode.

At this time, the first electronic control unit 310 may operate abnormally and temporarily operate in an abnormally operating switching state before the second electronic control unit 320 operates. Although this transition state may be about 10 ms to 100 ms, since the driver feels discomfort from kickback as the driver temporarily operates abnormally within 10 ms, kickback reduction is required in the transition state.

In the transition state, various devices and valves are provided in an abnormal state, and as the operation of the hydraulic pressure supply device 1300 that provided hydraulic pressure is stopped, the pressure medium acting on each of the wheel cylinders 21, 22, 23, and 24 The hydraulic pressure is released and may leak.

Specifically, as the first cut valve 2531 of the first outlet passage 2530 is converted to an open state, it acts on the third and fourth wheel cylinders 23 and 24 provided in the first hydraulic circuit 1510. The pressurized medium may be delivered to the sub reservoir 1100b through the first outlet passage 2530.

In addition, as the second cut valve 2541 of the second outlet passage 2540 is switched to the open state, the action acting on the first and second wheel cylinders 21 and 22 provided in the second hydraulic circuit 1520 The pressurized medium may leak into the sub reservoir 1100b through the second outlet passage 2540 . Accordingly, the pressurized medium leaking from the plurality of wheel cylinders 21, 22, 23, and 24 does not cause kickback because it is not transferred to the master cylinder 2200.

Meanwhile, the pedal simulator 2250 is connected to the master chamber 2220a through the first connection line 2610 to reduce kickback by maintaining a pedal feeling in the master piston 2220 and the brake pedal 10 connected thereto. .

That is, the electronic brake system 1000 according to the second embodiment of the present invention always connects the master chamber 2220a and the pedal simulator 2250 in normal and abnormal operating conditions, thereby determining whether the electronic control unit 300 has failed. It has the advantage of maintaining the pedal feel without the need and reducing the kickback that occurs in the transition state.

10 is a hydraulic circuit diagram showing the operation of the electronic brake system 2000 in the second normal mode according to the second embodiment of the present invention.

Referring to FIG. 10, the electronic brake system 2000 according to the second embodiment of the present invention goes through the first normal mode and the transition state as described above, and then the second normal mode controlled by the second electronic control unit 320. mode can work.

In the second normal mode, when the first electronic control unit 310 fails or operates abnormally, the second electronic control unit 320 replaces the first electronic control unit 310 and controls various devices and valves to operate normally. can do.

Since the operations of various devices and valves in the second normal mode are the same as those in the first normal mode, descriptions thereof are omitted to prevent duplication.

As described above, the electronic brake systems 1000 and 2000 of the first and second embodiments of the present invention include a plurality of electronic control units 300, so that even if one electronic control unit fails or operates abnormally, other electronic control units Safety can be improved by the control unit acting instead.

In addition, the electronic brake system (1000, 2000) of the first and second embodiments of the present invention maintains pedal feel and reduces kickback even when one electronic control unit fails or operates abnormally and is switched to another electronic control unit. Driver discomfort can be reduced.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

1000,2000: Electronic brake system
100: first block 200: second block
300: electronic control unit 310: first electronic control unit
320: second electronic control unit 1100a: main reservoir
1100b: sub reservoir 1200: master cylinder
1250: Pedal simulator 1300: Hydraulic supply
1400: hydraulic control unit 1510: first hydraulic circuit
1520: second hydraulic circuit 1600: connection line

Claims (17)

A first block including a master cylinder having a first master piston connected to the brake pedal and a first master chamber whose volume is varied by displacement of the first master piston;
A pedal simulator, a hydraulic pressure supply device that generates hydraulic pressure by operating a hydraulic piston by an electrical signal, and a first hydraulic circuit that controls the hydraulic pressure transmitted to two wheel cylinders and controls the hydraulic pressure transmitted to the other two wheel cylinders a second block including a hydraulic control unit having a second hydraulic circuit and spaced apart from the first block;
a plurality of electronic control units controlling various devices and valves based on hydraulic pressure information and displacement information of the brake pedal; and
A connection line having one end connected to the first block and the other end connected to the second block;
The connecting line is
One end is connected to the first master chamber and the other end is connected to the pedal simulator side,
The second block is
A sub-reservoir in which pressurized medium is stored;
an outlet passage connecting the first hydraulic circuit and the sub reservoir;
The electronic brake system further comprises a first cut valve provided in the outlet passage to control the flow of the pressurized medium. According to claim 1,
the master cylinder
Further comprising a second master piston provided to be displaceable by the hydraulic pressure of the first master chamber, and a second master chamber whose volume is varied by displacement of the second master piston,
The connecting line is
The electronic brake system further comprising a second connection line having one end connected to the second master chamber and the other end connected to the second hydraulic circuit side. According to claim 2,
The first block further includes a main reservoir in which a pressurized medium is stored,
The connecting line is
The electronic brake system further comprises a third connection line having one end connected to the main reservoir and the other end connected to the sub reservoir. According to claim 3,
The second block is
The electronic brake system further comprises a second cut valve provided in the second connection line to control the flow of the pressurized medium. According to claim 4,
The second block is
The electronic brake system further includes a first sub-reservoir passage connecting the sub-reservoir and a rear end of the first hydraulic circuit, and a second sub-reservoir passage connecting the sub-reservoir and a rear end of the second hydraulic circuit. According to claim 5,
The second block is
Further comprising a simulator discharge passage connected to the rear end of the pedal simulator,
The simulator discharge flow path joins the first sub-reservoir flow path and is connected to the sub-reservoir. According to claim 2,
The hydraulic control unit
The electronic brake system further includes a balance passage connecting the first hydraulic circuit and the second hydraulic circuit, and a balance valve provided in the balance passage to control a flow of a pressurized medium. According to claim 1,
The first block is
The electronic brake system further comprises a pedal folding device provided between the first master piston and the brake pedal. According to claim 8,
The first block further includes a main reservoir in which a pressurized medium is stored,
The second block further includes a sub-reservoir in which a pressurized medium is stored,
The connecting line is
The electronic brake system further comprises a second connection line having one end connected to the main reservoir and the other end connected to the sub reservoir. According to claim 9,
The second block is
The electronic brake system further includes a first sub-reservoir passage connecting the sub-reservoir and a rear end of the first hydraulic circuit, and a second sub-reservoir passage connecting the sub-reservoir and a rear end of the second hydraulic circuit. According to claim 10,
The second block is
a first outlet passage connecting the first hydraulic circuit and the first sub-reservoir passage;
a second outlet passage connecting the second hydraulic circuit and the sub reservoir;
A first cut valve provided in the first outlet passage to control the flow of a pressurized medium;
The electronic brake system further comprises a second cut valve provided in the second outlet passage to control the flow of the pressurized medium. According to claim 10,
The second block is
Further comprising a simulator discharge passage connected to the rear end of the pedal simulator,
The simulator discharge flow path joins the first sub-reservoir flow path and is connected to the sub-reservoir. According to claim 8,
The pedal folding device
An electronic brake system comprising: an actuator for generating and providing power; and a gear part provided between an input rod connected to the brake pedal and the actuator to convert rotational force of the actuator into linear motion of the input rod. The method of claim 5 or 10,
The hydraulic supply device
An electronic brake system comprising a first pressure chamber provided in front of the hydraulic piston and a second pressure chamber provided in the rear of the hydraulic piston. According to claim 14,
The second block is
Further comprising a dump control unit provided between the sub reservoir and the hydraulic pressure supply device to control the flow of the pressurized medium,
The dump control unit
An electronic brake system comprising a first dump control unit controlling a flow of pressurized medium between the first pressure chamber and the sub-reservoir, and a second dump control unit controlling a flow of pressurized medium between the second pressure chamber and the sub-reservoir. . According to claim 15,
The second block is
The electronic brake system further comprises a third sub-reservoir passage connecting the sub-reservoir and the first dump control unit, and a fourth sub-reservoir passage connecting the sub-reservoir and the second dump control unit. According to claim 1,
The plurality of electronic control units
An electronic brake system comprising a first electronic control unit that controls various devices and valves, and a second electronic control unit that operates when the first electronic control unit is abnormally operated.

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