Electronic brake system

Abstract

The present application discloses an electronic brake system. The electronic brake system according to the present embodiment comprises: a first block provided with a mechanism part mechanically operated in linkage with a brake pedal; a second block provided with an electronic part electronically operated and controlled by an electronic control unit; and a connecting line hydraulically connecting the first block and the second block, the first block and the second block can be arranged at positions apart from each other on a vehicle, so that the installation of the brake system and the design freedom of the vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to an electronic braking system, and more specifically, to an electronic braking system that generates braking force using an electrical signal corresponding to the displacement of the brake pedal. Background Technology

[0002] Vehicles must be equipped with braking systems to perform braking, and various types of braking systems have been proposed for the safety of drivers and passengers.

[0003] Traditional braking systems primarily use a mechanically connected booster to supply the hydraulic pressure required for braking to the wheel cylinders when the driver depresses the brake pedal. However, with the increasing market demand for various braking functions to precisely respond to different vehicle operating environments, electronic braking systems are becoming increasingly popular. These systems receive electrical signals from a pedal displacement sensor that senses the driver's braking intention when the brake pedal is depressed, and then operate a hydraulic supply device based on these signals to supply the necessary hydraulic pressure to the wheel cylinders.

[0004] As described above, the electronic braking system generates and provides electrical signals for the driver's brake pedal operation in normal operating mode or for braking judgment during autonomous driving. This electrically operates and controls the hydraulic supply device, thereby generating the hydraulic pressure required for braking and transmitting it to the wheel cylinders. While this electronic braking system and operating method can be electrically operated and controlled, and can achieve a variety of complex braking actions, a risk to passenger safety may arise if technical problems occur with the electrical components, preventing the stable generation of the required braking hydraulic pressure.

[0005] Therefore, in electronic braking systems, when some components malfunction or become uncontrollable, an abnormal operating mode will be entered. In this case, the driver's brake pedal operation needs to be directly linked to the wheel cylinder mechanism. That is, during abnormal operation of the electronic braking system, as the driver applies force to the brake pedal, the hydraulic pressure required for braking should be immediately generated and directly transmitted to the wheel cylinders. Furthermore, a solution is needed to accurately and quickly check for malfunctions in the electronic braking system, enabling rapid entry into the abnormal operating mode in emergencies to ensure passenger safety.

[0006] On the other hand, when installing electronic braking systems in vehicles, the limitations of system module size and placement restrict the vehicle's design freedom. Therefore, a solution is needed that can effectively house the system modules while maintaining the vehicle's braking performance. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] This embodiment aims to provide an electronic braking system that can effectively achieve braking in various application situations.

[0009] This embodiment aims to provide an electronic braking system with improved performance and operational reliability.

[0010] This embodiment aims to provide an electronic braking system that can improve the design freedom of vehicles.

[0011] This embodiment aims to provide an electronic braking system that can easily and effectively implement vehicle settings and configurations.

[0012] This embodiment aims to provide an electronic braking system that reduces the load applied to components to improve product durability.

[0013] (II) Technical Solution

[0014] According to one aspect of the present invention, an electronic braking system can be provided, comprising: a first block having a mechanism mechanically operated in conjunction with a brake pedal; a second block having an electronic component electronically operated and controlled by an electronic control unit, the second block and the first block being spaced apart; and a connecting line hydraulically connecting the first block and the second block to each other, the mechanism including a master cylinder, the master cylinder including: a first master piston connected to the brake pedal; a first master chamber whose volume changes according to the displacement of the first master piston; a second master piston configured to be displaceable according to the hydraulic pressure of the first master chamber; and a second master chamber whose volume changes according to the displacement of the first master piston. The electronic components, which change according to the displacement of the main piston, include: a check valve; a pedal simulator; a hydraulic supply device that operates the hydraulic piston to generate hydraulic pressure according to an electrical signal; and a hydraulic control unit, including: a first hydraulic circuit that controls the hydraulic pressure transmitted to two wheel cylinders; and a second hydraulic circuit that controls the hydraulic pressure transmitted to the other two wheel cylinders. The connecting lines include: a first connecting line, one end of which is connected to the first main chamber and the other end of which is connected to the first hydraulic circuit side; and a second connecting line, one end of which is connected to the second main chamber, and the other end of which is branched and connected to the pedal simulator and the second hydraulic circuit side respectively, and the check valve is provided at the front end of the branch position.

[0015] The mechanism may further include a main reservoir for storing pressurized medium, the electronics may further include a secondary reservoir for storing pressurized medium, and the connecting line may further include a third connecting line, one end of which is connected to the main reservoir and the other end of which is connected to the secondary reservoir.

[0016] The other end of the second connecting line can be branched into a simulated flow path connected to the front end of the pedal simulator and a spare line connected to the second hydraulic circuit side. The electronic unit may further include: a first shut-off valve disposed on the first connecting line to control the flow of the pressurized medium; and a second shut-off valve disposed on the spare line to control the flow of the pressurized medium.

[0017] The electronic component may further include a simulator valve disposed in the simulated flow path to control the flow of the pressurized medium.

[0018] The electronic component may further include: a first auxiliary reservoir flow path connecting the auxiliary reservoir and the rear end of the first hydraulic circuit; and a second auxiliary reservoir flow path connecting the auxiliary reservoir and the rear end of the second hydraulic circuit.

[0019] The electronic component may further include a simulator discharge path connected to the rear end of the pedal simulator, the simulator discharge path converging into the second auxiliary reservoir path and connected to the auxiliary reservoir.

[0020] The hydraulic supply device may include a first pressure chamber located in front of the hydraulic piston and a second pressure chamber located behind the hydraulic piston.

[0021] The electronic unit may further include: a discharge control unit disposed between the auxiliary reservoir and the hydraulic supply device to control the flow of the pressurized medium, the discharge control unit including: a first discharge control unit for controlling the flow of the pressurized medium between the first pressure chamber and the auxiliary reservoir; and a second discharge control unit for controlling the flow of the pressurized medium between the second pressure chamber and the auxiliary reservoir.

[0022] The electronic unit may further include: a third auxiliary liquid reservoir flow path connecting the auxiliary liquid reservoir and the first discharge control unit; and a fourth auxiliary liquid reservoir flow path connecting the auxiliary liquid reservoir and the second discharge control unit.

[0023] The first hydraulic circuit may include: a first inlet valve and a second inlet valve, controlling the flow of pressurized medium supplied from the hydraulic supply device to the first wheel cylinder and the second wheel cylinder respectively; and a first outlet valve and a second outlet valve, controlling the flow of pressurized medium discharged from the first wheel cylinder and the second wheel cylinder respectively. The second hydraulic circuit may include: a third inlet valve and a fourth inlet valve, controlling the flow of pressurized medium supplied from the hydraulic supply device to the third wheel cylinder and the fourth wheel cylinder respectively; and a third outlet valve and a fourth outlet valve, controlling the flow of pressurized medium discharged from the third wheel cylinder and the fourth wheel cylinder respectively. The pressurized medium discharged through the first outlet valve and the second outlet valve may be provided to the first auxiliary reservoir flow path, and the pressurized medium discharged through the third outlet valve and the fourth outlet valve may be provided to the second auxiliary reservoir flow path.

[0024] The mechanism may further include: a first main reservoir flow path connecting the main reservoir and the first main chamber; and a second main reservoir flow path connecting the main reservoir and the second main chamber.

[0025] The first and second connecting lines can be configured as rigid pipes, and the third connecting line can be configured as a flexible hose.

[0026] The pedal simulator may include: a simulated piston configured to be displaced by hydraulic pressure from a pressurized medium supplied from the simulated flow path; a simulated chamber whose volume changes according to the displacement of the simulated piston and is connected to the simulator discharge flow path; and a simulated spring that elastically supports the simulated piston.

[0027] (III) Beneficial Effects

[0028] The electronic braking system according to this embodiment can achieve stable and effective braking in various application conditions of the vehicle.

[0029] The electronic braking system according to this embodiment can increase the freedom of vehicle design.

[0030] The electronic braking system according to this embodiment can easily and effectively perform vehicle setup and configuration.

[0031] The electronic braking system according to this embodiment can improve the performance and operational reliability of the product.

[0032] The electronic braking system according to this embodiment can stably provide braking pressure even when a component fails.

[0033] This embodiment aims to provide an electronic braking system that reduces the load applied to components to improve product durability. Attached Figure Description

[0034] Figure 1 This is a hydraulic circuit diagram illustrating an electronic braking system according to a first embodiment of the present invention.

[0035] Figure 2 This is a hydraulic circuit diagram illustrating an electronic braking system according to a second embodiment of the present invention. Detailed Implementation

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. These embodiments are provided to fully convey the spirit of the invention to those skilled in the art. The invention is not limited to the embodiments described below and can be embodied in other forms. In the drawings, for clarity of illustration, parts unrelated to the description may be omitted, and for aid of understanding, the dimensions of components may be enlarged.

[0037] Figure 1 This is a hydraulic circuit diagram showing the electronic braking system 1 according to a first embodiment of the present invention.

[0038] Reference Figure 1 According to a first embodiment of the present invention, the electronic braking system 1 may include: a first block 100, which is provided with a mechanically operated mechanism; a second block 200, which is provided with an electronically operated and controlled electronic part; and a plurality of connecting lines 400, which are hydraulically connected to the first block 100 and the second block 200.

[0039] The first block 100 is equipped with a mechanism that connects to and is mechanically operated by the brake pedal 10, while the second block 200 is equipped with electronic components such as valves and sensors that are electronically operated and controlled by an electronic control unit (not shown). The first block 100 and the second block 200 are spaced apart from each other in the vehicle and can be hydraulically connected by multiple connecting lines 400. This improves the vehicle installability of the electronic braking system 1 and ensures design freedom for efficient space configuration.

[0040] The mechanism includes components that are linked to the brake pedal 10 to perform mechanical operations independently of the control signals of the electronic control unit, and may be located in the first block 100.

[0041] The mechanism may include: a main reservoir 1100a, which stores pressurized media such as brake fluid; a master cylinder 1200, which pressurizes and discharges the pressurized media such as brake fluid contained inside according to the pedal force of the brake pedal 10; and main reservoir flow paths 1110a and 1120a, which connect the main reservoir 1100a and the master cylinder 1200.

[0042] The master cylinder 1200 is configured to have at least one hydraulic chamber, thereby pressurizing and discharging the pressurized medium inside. The master cylinder 1200 may include a first master chamber 1220a and a second master chamber 1230a, and a first master piston 1220 and a second master piston 1230 disposed in each master chamber 1220a, 1230a.

[0043] The first main chamber 1220a can be formed on the inlet side of the cylinder block 1210 connected to the brake pedal 10 (to... Figure 1 (Based on the right side), the first main piston 1220 can be reciprocally movably accommodated in the first main chamber 1220a.

[0044] The first main chamber 1220a can be emptied and pressurized medium can flow in and out through the first hydraulic port 1280a and the second hydraulic port 1280b. The first hydraulic port 1280a is connected to the first main reservoir flow path 1110a described below, so that the pressurized medium flows from the main reservoir 1100a into the first main chamber 1220a, in front of the first hydraulic port 1280a (within the direction of...). Figure 1 (based on the left side) and rear (with) Figure 1 A pair of sealing components are provided on the right side (based on the reference) to seal the first main chamber 1220a. The second hydraulic port 1280b is connected to the first connecting line 410 described below, so that the pressurized medium of the first main chamber 1220a can be discharged to the first connecting line 410, or conversely, so that the pressurized medium can flow from the first connecting line 410 into the first main chamber 1220a.

[0045] The first main piston 1220 is housed in the first main chamber 1220a and can pressurize the pressurized medium housed in the first main chamber 1220a by moving forward, or create a negative pressure inside the first main chamber 1220a by moving backward. Specifically, when the first main piston 1220 moves forward, as the volume of the first main chamber 1220a decreases, the pressurized medium inside the first main chamber 1220a is pressurized, thereby forming hydraulic pressure. Conversely, when the first main piston 1220 moves backward, as the volume of the first main chamber 1220a increases, the pressurized medium inside the first main chamber 1220a can be depressurized, and at the same time, a negative pressure can be formed in the first main chamber 1220a.

[0046] The second main chamber 1230a can be formed in the cylinder 1210 on the front side of the first main chamber 1220a (towards). Figure 1 (based on the left side), and the second main piston 1230 can be reciprocally movably accommodated in the second main chamber 1230a.

[0047] The second main chamber 1230a can be supplied with pressurized medium through the third hydraulic port 1280c and the fourth hydraulic port 1280d. The third hydraulic port 1280c is connected to the second main reservoir flow path 1120a described below, so that the pressurized medium flows from the main reservoir 1100a into the second main chamber 1230a. The third hydraulic port 1280d is located in front of ( ) Figure 1 (based on the left side) and rear (with) Figure 1 A pair of sealing components are provided on the right side (based on the reference) to seal the second main chamber 1230a. The fourth hydraulic port 1280d is connected to the second connecting line described below, so that the pressurized medium of the second main chamber 1230a can be discharged to the second connecting line, or conversely, so that the pressurized medium can flow from the second connecting line into the second main chamber 1230a.

[0048] The second main piston 1230 is housed in the second main chamber 1230a and can pressurize the pressurized medium contained in the second main chamber 1230a by moving forward, or create a negative pressure inside the second main chamber 1230a by moving backward. Specifically, when the second main piston 1230 moves forward, as the volume of the second main chamber 1230a decreases, the pressurized medium inside the second main chamber 1230a is pressurized, thereby creating hydraulic pressure. Conversely, when the second main piston 1230 moves backward, as the volume of the second main chamber 1230a increases, the pressurized medium inside the second main chamber 1230a can be depressurized, and at the same time, a negative pressure can be created in the second main chamber 1230a.

[0049] The first piston spring 1220b and the second piston spring 1230b can be configured to elastically support the first main piston 1220 and the second main piston 1230, respectively. For this purpose, the first piston spring 1220b can be disposed on the front surface of the first main piston 1220 (to...). Figure 1 The left end of the reference piston 1230 and the rear surface of the second main piston 1230 (with the reference left end) Figure 1 Between the right end of the reference point, the second piston spring 1230b can be disposed on the front surface of the second main piston 1230 (to the right end of the reference point). Figure 1 Between the left end (as referenced) and the inner side of the cylinder 1210. When the first master piston 1220 and the second master piston 1230 are displaced due to braking or other operations, the first piston spring 1220b and the second piston spring 1230b are compressed respectively. Then, when the braking or other operations are released, the first piston spring 1220b and the second piston spring 1230b expand by elastic force, thereby allowing the first master piston 1220 and the second master piston 1230 to return to their original positions respectively.

[0050] The main reservoir 1100a can contain and store pressurized medium on its inner side. The main reservoir 1100a can be connected to components such as the main cylinder 1200 and the third connection line 430 described below to provide or receive pressurized medium.

[0051] The main reservoir 1100a can be divided into multiple chambers by a partition 1105a. The main reservoir 1100a includes multiple main reservoir chambers 1101a, 1102a, and 1103a, and the multiple main reservoir chambers 1101a, 1102a, and 1103a can be arranged side by side in a row. Specifically, the main reservoir 1100a can be divided into a first main reservoir chamber 1101a located in the center, a second main reservoir chamber 1102a located on one side, and a third main reservoir chamber 1103a located on the other side.

[0052] Partitions 1105a can be disposed between adjacent main reservoir chambers, and each partition 1105a can be configured to have at least a partial opening at its upper end. Thus, adjacent main reservoir chambers 1101a, 1102a, and 1103a are interconnected, allowing the pressurized medium to move. As an example, when a significant amount of pressurized medium flows into the first main reservoir chamber 1101a, the pressurized medium can pass through the upper end of partition 1105a and be transferred to the second main reservoir chamber 1102a or the third main reservoir chamber 1103a.

[0053] The first main reservoir chamber 1101a can be connected to the third connection line 430 described below to provide pressurized medium to the auxiliary reservoir 1100b, or to receive pressurized medium from the auxiliary reservoir 1100b. Additionally, the second main reservoir chamber 1102a can be connected to the first main reservoir flow path 1110a described below, and the third main reservoir chamber 1103a can be connected to the second main reservoir flow path 1120a to provide pressurized medium to the main cylinder 1200 side or to receive pressurized medium from the main cylinder 1200.

[0054] As described above, by dividing the main reservoir 1100a into first main reservoir chambers 1101a, 1102a, and 1103a, respectively, stable operation of the electronic braking system 1 can be ensured. As an example, when the main reservoir 1100a is formed by a single chamber and the amount of pressurized medium is insufficient, it is impossible to stably supply pressurized medium to either the auxiliary reservoir 1100b or the master cylinder 1200. Therefore, by separating the first main reservoir chamber 1101a (connected to the auxiliary reservoir 1100b) and the second and third main reservoir chambers 1102a and 1103a (connected to the master cylinder 1200), the main reservoir 1100a can supply pressurized medium to other components even when pressurized medium cannot be supplied to any one component, thereby enabling vehicle braking.

[0055] The main reservoir flow path is configured to hydraulically connect the main cylinder 1200 and the main reservoir 1100a.

[0056] The main reservoir flow path may include: a first main reservoir flow path 1110a, a second main reservoir chamber 1102a connecting the first main chamber 1220a and the main reservoir 1100a; and a second main reservoir flow path 1120a, a third main reservoir chamber 1103a connecting the second main chamber 1230a and the main reservoir 1100a. For this purpose, one end of the first main reservoir flow path 1110a can be connected to the first main chamber 1220a of the main cylinder 1200, and the other end can be connected to the second main reservoir chamber 1102a of the main reservoir 1100a; one end of the second main reservoir flow path 1120a can be connected to the second main chamber 1230a of the main cylinder 1200, and the other end can be connected to the third main reservoir chamber 1103a of the main reservoir 1100a.

[0057] The electronic component includes components that are electronically operated and controlled via control signals from an electronic control unit (ECU, not shown), and may be located in the second block 200.

[0058] The electronic components may include: an electronic control unit; an auxiliary reservoir 1100b for storing pressurized medium internally; a pedal simulator 1250 for providing a reaction force to the driver's brake pedal 10; a hydraulic supply unit 1300 that receives an electrical signal as the driver's braking intention via a pedal displacement sensor 11 that senses the displacement of the brake pedal 10, thereby generating hydraulic pressure for the pressurized medium through mechanical operation; a hydraulic control unit 1400 that controls the hydraulic pressure provided by the hydraulic supply unit 1300 and the hydraulic pressure transmitted to the first to fourth wheel cylinders 21, 22, 23, and 24; and a dump control unit 1800 hydraulically connected to the auxiliary reservoir 1100b. The system includes a hydraulic supply unit 1300, which controls the flow of pressurized medium between them; multiple auxiliary reservoir flow paths 1710, 1720, 1730, and 1740, which connect auxiliary reservoir 1100b to the first hydraulic circuit 1510, the second hydraulic circuit 1520, and the discharge control unit 1800; multiple shut-off valves 411 and 422a, which are installed on the connection lines to control the flow of pressurized medium; a check valve 1900, which checks for leaks in the main cylinder 1200; a circuit pressure sensor PS1, which senses the hydraulic pressure of the pressurized medium supplied by the hydraulic supply unit 1300; and a cylinder pressure sensor PS2, which senses the hydraulic pressure of the first main chamber 1220a.

[0059] The auxiliary reservoir 1100b can be installed in the second unit 200 to assist in storing the pressurized medium. With the auxiliary reservoir 1100b also assisting in storing the pressurized medium in the electronic unit, the pressurized medium can be smoothly supplied and transmitted in the electronic unit such as the hydraulic supply device 1300, the discharge control unit 1800, the first hydraulic circuit 1510 and the second hydraulic circuit 1520.

[0060] The auxiliary reservoir 1100b can be connected to the main reservoir 1100a of the mechanism via the third connecting line 430 described below. Furthermore, the auxiliary reservoir 1100b can be connected to the first hydraulic circuit 1510 and the second hydraulic circuit 1520 via the first auxiliary reservoir flow path 1710 and the second auxiliary reservoir flow path 1720 respectively, and can be connected to the discharge control unit 1800 via the third auxiliary reservoir flow path 1730 and the fourth auxiliary reservoir flow path 1740.

[0061] The hydraulic supply device 1300 is configured to receive an electrical signal as the driver’s braking intention from a pedal displacement sensor that senses the displacement of the brake pedal 10, and to generate hydraulic pressure of the pressurized medium through mechanical operation.

[0062] The hydraulic supply device 1300 may include: a hydraulic supply unit that provides pressure of the pressurized medium to the wheel cylinder 20; a motor (not shown) that generates rotational force according to the electrical signal of the pedal displacement sensor; and a power conversion unit (not shown) that converts the rotational motion of the motor into linear motion and transmits it to the hydraulic supply unit.

[0063] The hydraulic supply unit includes: a cylinder block 1310 configured to contain a pressurized medium; a hydraulic piston 1320 housed in the cylinder block 1310; a sealing member 1350 disposed between the hydraulic piston 1320 and the cylinder block 1310 to seal pressure chambers 1330 and 1340; and a drive shaft 1390 that transmits power from the power conversion unit to the hydraulic piston 1320.

[0064] Pressure chambers 1330 and 1340 may include those located in front of the hydraulic piston 1320 (to... Figure 1 The first pressure chamber 1330 (located to the left of the hydraulic piston 1320 as a reference) and the rear of the hydraulic piston 1320 (within the left direction) Figure 1 The second pressure chamber 1340 is located to the right of the reference hydraulic piston 1320. That is, the first pressure chamber 1330 is separated by the cylinder body 1310 and the front surface of the hydraulic piston 1320, and is configured to change its volume according to the movement of the hydraulic piston 1320, and the second pressure chamber 1340 is separated by the cylinder body 1310 and the rear surface of the hydraulic piston 1320, and is configured to change its volume according to the movement of the hydraulic piston 1320.

[0065] The first pressure chamber 1330 is connected to the first hydraulic flow path 1401 through a first connecting hole formed in the cylinder body 1310, and the second pressure chamber 1340 is connected to the second hydraulic flow path 1402 through a second connecting hole formed in the cylinder body 1310.

[0066] The sealing components include: a piston sealing component 1350a, disposed between the hydraulic piston 1320 and the cylinder 1310 to seal the space between the first pressure chamber 1330 and the second pressure chamber 1340; and a drive shaft sealing component 1350b, disposed between the drive shaft 1390 and the cylinder 1310 to seal the openings of the second pressure chamber 1340 and the cylinder 1310. The hydraulic or negative pressure in 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 component 1350a and the drive shaft sealing component 1350b, thereby allowing leakage to the first hydraulic flow path 1401 and the second hydraulic flow path 1402 described below. Additionally, a chamber sealing component 1350c may be provided between the second pressure chamber 1340 and the drive shaft sealing component 1350b. The chamber sealing component 1350c can block the flow of pressurized medium leaking from the second pressure chamber 1340 to the auxiliary inflow path 1850 while allowing the flow of pressurized medium into the second pressure chamber 1340 through the auxiliary inflow path 1850 described below.

[0067] A motor (not shown) is configured to generate driving force for the hydraulic piston 1320 based on an electrical signal output from an electronic control unit (ECU). The motor may be configured to include a stator and a rotor, and may thereby rotate forward or backward to provide the power to generate displacement of the hydraulic piston 1320. The angular velocity and angle of rotation of the motor can be precisely controlled by a motor control sensor. Motors are well-known and publicly known technology; therefore, a detailed description will be omitted.

[0068] The power conversion unit (not shown) is configured to convert the rotational force of the motor into linear motion. As an example, the power conversion unit may be configured to include a worm shaft (not shown), a worm wheel (not shown), and a drive shaft 1390.

[0069] The worm shaft can be integrally formed with the rotating shaft of the motor, and a worm can be formed on the outer circumferential surface and mesh with a worm wheel to rotate the worm wheel. The worm wheel can mesh with the drive shaft 1390 to make the drive shaft 1390 move linearly, and the drive shaft 1390 is connected to the hydraulic piston 1320 and operates integrally, thereby allowing the hydraulic piston 1320 to slide within the cylinder 1310.

[0070] To reiterate the above operation, when the pedal displacement sensor 11 senses the displacement of the brake pedal 10, the sensed signal is transmitted to the electronic control unit, which 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 can generate hydraulic pressure in the first pressure chamber 1330 while moving forward in the cylinder 1310.

[0071] Conversely, when the pedal force of the brake pedal 10 is released, the electronic control unit drives the motor to rotate the worm gear axis 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 can move backward in the cylinder 1310 while generating negative pressure in the first pressure chamber 1330.

[0072] The generation of hydraulic and negative pressure in the second pressure chamber 1340 can be achieved by operating in the opposite direction to the aforementioned directions. That is, when the displacement of the brake pedal 10 is sensed by the pedal displacement sensor 11, the sensed signal is transmitted to the electronic control unit, which drives the motor to rotate the worm shaft in the opposite direction. The rotational force of the worm shaft is transmitted to the drive shaft 1390 through the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 can move backward in the cylinder 1310 while generating hydraulic pressure in the second pressure chamber 1340.

[0073] Conversely, when the pedal force of the brake pedal 10 is released, the electronic control unit drives the motor in one direction to rotate the worm gear axis in that direction. Therefore, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 can generate negative pressure in the second pressure chamber 1340 while moving forward in the cylinder 1310.

[0074] As described above, the hydraulic supply device 1300 can generate hydraulic pressure or negative pressure in the first pressure chamber 1330 and the second pressure chamber 1340 respectively according to the rotation direction of the worm shaft driven by the motor, and can determine whether to achieve braking by transmitting hydraulic pressure or to release braking by using negative pressure through the control valve.

[0075] On the other hand, as long as the rotational motion of the motor can be converted into the linear motion of the hydraulic piston 1320, the power conversion unit according to this embodiment is not limited to any particular structure, and should be understood in the case of a device composed of various structures and methods.

[0076] The hydraulic supply device 1300 can be hydraulically connected to the auxiliary reservoir 1100b via the discharge control unit 1800. The discharge control unit 1800 may include: a first discharge control unit that controls the flow of pressurized medium between the first pressure chamber 1330 and the auxiliary reservoir 1100b; and a second discharge control unit that controls the flow of pressurized medium between the second pressure chamber 1340 and the auxiliary reservoir 1100b. The first discharge control unit may include: a first discharge flow path 1810 connecting the first pressure chamber 1330 and the auxiliary reservoir 1100b; and a first bypass flow path 1830 that branches off from the first discharge flow path 1810 and then rejoins. The second discharge control unit may include: a second discharge flow path 1820 connecting the second pressure chamber 1340 and the auxiliary reservoir 1100b; and a second bypass flow path 1840 that branches off from the second discharge flow path 1820 and then rejoins.

[0077] The first discharge path 1810 and the first bypass path 1830 may be respectively equipped with a first discharge check valve 1811 and a first discharge valve 1831 to control the flow of the pressurized medium. The first discharge check valve 1811 may be configured to allow only the flow of the pressurized medium from the auxiliary reservoir 1100b toward the first pressure chamber 1330, and to block the flow of the pressurized medium in the opposite direction. In the first discharge path 1810, the first bypass path 1830 is connected in parallel with the first discharge check valve 1811, and the first bypass path 1831 may be provided to control the flow of the pressurized medium between the first pressure chamber 1330 and the auxiliary reservoir 1100b. In other words, the first bypass flow path 1830 can bypass and connect the front and rear ends of the first discharge check valve 1811 on the first discharge flow path 1810, and the first discharge valve 1831 can be configured as a bidirectional solenoid valve controlling the flow of the pressurized medium between the first pressure chamber 1330 and the auxiliary reservoir 1100b. The first discharge valve 1831 can be configured as a normally closed solenoid valve that is normally closed and operates to open when receiving an electrical signal from the electronic control unit.

[0078] The second discharge path 1820 and the second bypass path 1840 may be respectively equipped with a second discharge check valve 1821 and a second discharge valve 1841 to control the flow of the pressurized medium. The second discharge check valve 1821 may be configured to allow only the flow of the pressurized medium from the auxiliary reservoir 1100b toward the second pressure chamber 1340, and to block the flow of the pressurized medium in the opposite direction. In the second discharge path 1820, the second bypass path 1840 is connected in parallel with the second discharge check valve 1821, and the second bypass path 1840 may be equipped with a second discharge valve 1841 to control the flow of the pressurized medium between the second pressure chamber 1340 and the auxiliary reservoir 1100b. In other words, the second bypass flow path 1840 can bypass and connect the front and rear ends of the second discharge check valve 1821 on the second discharge flow path 1820, and the second discharge valve 1841 can be configured as a bidirectional solenoid valve controlling the flow of the pressurized medium between the second pressure chamber 1340 and the auxiliary reservoir 1100b. The second discharge valve 1841 can be configured as a normally open type solenoid valve that is normally open and operates to close when receiving an electrical signal from the electronic control unit.

[0079] Additionally, the discharge control unit 1800 may include an auxiliary inflow path 1850 connecting the auxiliary reservoir 1100b and the second pressure chamber 1340, so that the pressurized medium can fill the second pressure chamber 1340. The auxiliary inflow path 1850 may be connected to the rear of the chamber sealing component 1350c of the cylinder body 1310 (towards...). Figure 1 (Right side as reference). Thus, the pressurized medium can flow from the reservoir 1100 into the second pressure chamber 1340 through the auxiliary inflow path 1850, and the flow of pressurized medium leaking from the second pressure chamber 1340 into the auxiliary inflow path 1850 can be blocked by the sealing member 1350c.

[0080] The hydraulic control unit 1400 can be configured to control the hydraulic pressure transmitted to each wheel cylinder 20, and the electronic control unit (ECU) is configured to control the hydraulic supply device 1300 and various valves based on hydraulic information and pedal displacement information.

[0081] The hydraulic control unit 1400 may be provided with a first hydraulic circuit 1510 for controlling the hydraulic flow transmitted to the first wheel cylinder 21 and the second wheel cylinder 22 of the four wheel cylinders 20, and a second hydraulic circuit 1520 for controlling the hydraulic flow transmitted to the third wheel cylinder 23 and the fourth wheel cylinder 24. The hydraulic control unit 1400 includes multiple flow paths and valves to control the hydraulic pressure transmitted from the hydraulic supply device 1300 to the wheel cylinders 20.

[0082] The first hydraulic flow path 1401 can be configured to connect to the first pressure chamber 1330, and the second hydraulic flow path 1402 can be configured to connect to the second pressure chamber 1340. The first hydraulic flow path 1401 and the second hydraulic flow path 1402 can be configured to, after merging into the third hydraulic flow path 1403, branch again into a fourth hydraulic flow path 1404 connected to the first hydraulic circuit 1510 and a fifth hydraulic flow path 1405 connected to the second hydraulic circuit 1520.

[0083] The sixth hydraulic flow path 1406 is configured to connect to the first hydraulic circuit 1510, and the seventh hydraulic flow path 1407 is configured to connect to the second hydraulic circuit 1520. The sixth hydraulic flow path 1406 and the seventh hydraulic flow path 1407 can be configured to, after merging into the eighth hydraulic flow path 1408, branch again into the ninth hydraulic flow path 1409, which connects to the first pressure chamber 1330, and the tenth hydraulic flow path 1410, which connects to the second pressure chamber 1340.

[0084] The first hydraulic flow path 1401 may be provided with a first valve 1431 for controlling the flow of pressurized medium. The first valve 1431 may be configured as a check valve that allows the flow of pressurized medium discharged from the first pressure chamber 1330 and blocks the flow of pressurized medium in the opposite direction. Additionally, the second hydraulic flow path 1402 may be provided with a second valve 1432 for controlling the flow of pressurized medium. The second valve 1432 may be configured as a check valve that allows the flow of pressurized medium discharged from the second pressure chamber 1340 and blocks the flow of pressurized medium in the opposite direction.

[0085] The fourth hydraulic flow path 1404 is configured to branch again from the third hydraulic flow path 1403, which merges with the first hydraulic flow path 1401 and the second hydraulic flow path 1402, and connect to the first hydraulic circuit 1510. The fourth hydraulic flow path 1404 may be provided with a third valve 1433 to control the flow of pressurized medium. The third valve 1433 may be configured as a check valve that only allows the flow of pressurized medium from the third hydraulic flow path 1403 toward the first hydraulic circuit 1510 and blocks the flow of pressurized medium in the opposite direction.

[0086] The fifth hydraulic flow path 1405 is configured to branch again from the third hydraulic flow path 1403, which merges with the first hydraulic flow path 1401 and the second hydraulic flow path 1402, and connect to the second hydraulic circuit 1520. The fifth hydraulic flow path 1405 may be equipped with a fourth valve 1434 to control the flow of the pressurized medium. The fourth valve 1434 may be configured as a check valve that only allows the flow of pressurized medium from the third hydraulic flow path 1403 toward the second hydraulic circuit 1520 and blocks the flow of pressurized medium in the opposite direction.

[0087] The sixth hydraulic flow path 1406 connects to the first hydraulic circuit 1510, and the seventh hydraulic flow path 1407 connects to the second hydraulic circuit 1520. The sixth and seventh hydraulic flow paths 1406 and 1407 are configured to merge into the eighth hydraulic flow path 1408. The sixth hydraulic flow path 1406 may be equipped with a fifth valve 1435 to control the flow of the pressurized medium. The fifth valve 1435 may be configured as a check valve that only allows the flow of pressurized medium discharged from the first hydraulic circuit 1510 and blocks the flow of pressurized medium in the opposite direction. Additionally, the seventh hydraulic flow path 1407 may be equipped with a sixth valve 1436 to control the flow of the pressurized medium. The sixth valve 1436 may be configured as a check valve that only allows the flow of pressurized medium discharged from the second hydraulic circuit 1520 and blocks the flow of pressurized medium in the opposite direction.

[0088] The ninth hydraulic flow path 1409 is configured to branch off from the eighth hydraulic flow path 1408, which is formed by the convergence of the sixth and seventh hydraulic flow paths 1406 and connect to the first pressure chamber 1330. The ninth hydraulic flow path 1409 may be equipped with a seventh valve 1437 for controlling the flow of the pressurized medium. The seventh valve 1437 may be configured as a bidirectional control valve for controlling the flow of the pressurized medium transmitted along the ninth hydraulic flow path 1409. The seventh valve 1437 may be configured as a normally closed solenoid valve that is normally closed and operates to open when receiving an electrical signal from the electronic control unit.

[0089] The tenth hydraulic flow path 1410 is configured to branch off from the eighth hydraulic flow path 1408, which is formed by the convergence of the sixth and seventh hydraulic flow paths 1406 and connect to the second pressure chamber 1340. The tenth hydraulic flow path 1410 may be equipped with an eighth valve 1438 for controlling the flow of the pressurized medium. The eighth valve 1438 may be configured as a bidirectional control valve for controlling the flow of the pressurized medium transmitted along the tenth hydraulic flow path 1410. Similar to the seventh valve 1437, the eighth valve 1438 may be configured as a normally closed solenoid valve that is normally closed and operates to open when receiving an electrical signal from the electronic control unit.

[0090] The hydraulic control unit 1400, through the hydraulic flow path and valve arrangement described above, allows the hydraulic pressure generated in the first pressure chamber 1330 due to the forward movement of the hydraulic piston 1320 to be transmitted sequentially through the first hydraulic flow path 1401, the third hydraulic flow path 1403, and the fourth hydraulic flow path 1404 to the first hydraulic circuit 1510, and sequentially through the first hydraulic flow path 1401 and the fifth hydraulic flow path 1405 to the second hydraulic circuit 1520. Furthermore, the hydraulic pressure generated in the second pressure chamber 134 due to the backward movement of the hydraulic piston 1320 can be transmitted sequentially through the second hydraulic flow path 1402 and the fourth hydraulic flow path 1404 to the first hydraulic circuit 1510, and sequentially through the second hydraulic flow path 1402, the third hydraulic flow path 1403, and the fifth hydraulic flow path 1405 to the second hydraulic circuit 1520.

[0091] Conversely, the negative pressure formed in the first pressure chamber 1330 due to the rearward movement of the hydraulic piston 1320 can return the pressurized medium supplied to the first hydraulic circuit 1510 to the first pressure chamber 1330 by sequentially passing through the sixth hydraulic flow path 1406, the eighth hydraulic flow path 1408, and the ninth hydraulic flow path 1409. Similarly, the pressurized medium supplied to the second hydraulic circuit 1520 can return to the first pressure chamber 1330 by sequentially passing through the seventh hydraulic flow path 1407, the eighth hydraulic flow path 1408, and the ninth hydraulic flow path 1409. Furthermore, the negative pressure formed in the second pressure chamber 1340 due to the forward movement of the hydraulic piston 1320 can cause the pressurized medium supplied to the first hydraulic circuit 1510 to be returned to the first pressure chamber 1340 in sequence through the sixth hydraulic flow path 1406, the eighth hydraulic flow path 1408, and the tenth hydraulic flow path 1410, and the pressurized medium supplied to the second hydraulic circuit 1520 can be returned to the second pressure chamber 1340 in sequence through the seventh hydraulic flow path 1407, the eighth hydraulic flow path 1408, and the tenth hydraulic flow path 1410.

[0092] The first hydraulic circuit 1510 of the hydraulic control unit 1400 can control the hydraulic pressure of the first wheel cylinder 21 and the second wheel cylinder 22, which are two wheel cylinders 20 in four wheels (RR, RL, FR and FL), and the second hydraulic circuit 1520 can control the hydraulic pressure of the third wheel cylinder 23 and the fourth wheel cylinder 24, which are two other wheel cylinders 20.

[0093] The first hydraulic circuit 1510 can receive hydraulic pressure through the fourth hydraulic flow path 1404 and discharge hydraulic pressure through the sixth hydraulic flow path 1406. Therefore, as follows... Figure 1As shown, the fourth hydraulic flow path 1404 and the sixth hydraulic flow path 1406 can be configured to branch into two flow paths connecting to the first wheel cylinder 21 and the second wheel cylinder 22 after merging. Additionally, the second hydraulic circuit 1520 can receive hydraulic pressure through the fifth hydraulic flow path 1405 and discharge hydraulic pressure through the seventh hydraulic flow path 1407, for this purpose, as... Figure 1 As shown, the fifth hydraulic flow path 1405 and the seventh hydraulic flow path 1407 can be configured to branch into two flow paths connecting to the third wheel cylinder 23 and the fourth wheel cylinder 24 after merging. However, Figure 1 The hydraulic flow path connection shown is merely an example to aid in understanding the invention and is not limited to this structure. It should also be understood that the connection can be made in various ways and structures as follows. For example, the fourth hydraulic flow path 1404 and the sixth hydraulic flow path 1406 can be connected to the first hydraulic circuit 1510 side, and independently branch and connect to the first wheel cylinder 21 and the second wheel cylinder 22. Similarly, the fifth hydraulic flow path 1405 and the seventh hydraulic flow path 1407 can be connected to the second hydraulic circuit 1520 side, and independently branch and connect to the third wheel cylinder 23 and the fourth wheel cylinder 24.

[0094] The first hydraulic circuit 1510 and the second hydraulic circuit 1520 may be respectively equipped with first inlet valves to fourth inlet valves 1511a, 1511b, 1521a, and 1521b for controlling the flow of pressurized medium and hydraulic pressure transmitted to the first to fourth cylinders 21, 22, 23, and 24. The first inlet valves to fourth inlet valves 1511a, 1511b, 1521a, and 1521b may be respectively located upstream of the first to fourth cylinders 21, 22, 23, and 24, and may be configured as normally open solenoid valves that operate as closed valves when receiving an electrical signal from the electronic control unit.

[0095] The first hydraulic circuit 1510 and the second hydraulic circuit 1520 may include a first check valve to a fourth check valve 1513a, 1513b, 1523a, 1523b connected in parallel with the first inlet valve to the fourth inlet valve 1511a, 1511b, 1521a, 1521b. The first check valve to the fourth check valve 1513a, 1513b, 1523a, 1523b may be provided in the first hydraulic circuit 1510 and the second hydraulic circuit 1520 in bypass flow paths connecting the first inlet valve to the fourth inlet valve 1511a, 1511b, 1521a, 1521b, and may only allow the flow of pressurized medium discharged from each wheel cylinder, while blocking the flow of pressurized medium from the hydraulic supply device 1300 to the wheel cylinder. The hydraulic pressure applied to each wheel cylinder can be quickly discharged through the first check valve to the fourth check valve 1513a, 1513b, 1523a, 1523b. In the event that the first inlet valve to the fourth inlet valve 1511a, 1511b, 1521a, 1521b cannot operate normally, the hydraulic pressure applied to the wheel cylinder can also be discharged smoothly.

[0096] The first hydraulic circuit 1510 may include a first outlet valve 1512a and a second outlet valve 1512b that adjust the discharge of pressurized medium to improve performance when releasing the brakes of the first wheel cylinder 21 and the second wheel cylinder 22. The first outlet valve 1512a and the second outlet valve 1512b can sense the braking pressure of the first wheel cylinder 21 and the second wheel cylinder 22 and selectively open in situations requiring decompression braking, such as ABS (anti-lock braking system) release mode, thereby discharging the pressurized medium applied to the first wheel cylinder 21 and the second wheel cylinder 22 through the first auxiliary reservoir flow path 1710 described below to the auxiliary reservoir 1100b. The first outlet valve 1512a and the second outlet valve 1512b may be configured as normally closed solenoid valves that open upon receiving an electrical signal from the electronic control unit.

[0097] The second hydraulic circuit 1520 may include a third outlet valve 1522a and a fourth outlet valve 1522b for adjusting the discharge of pressurized medium to improve performance when releasing the brakes of the third wheel cylinder 23 and the fourth wheel cylinder 24. The third outlet valve 1522a and the fourth outlet valve 1522b can sense the braking pressure of the third wheel cylinder 23 and the fourth wheel cylinder 24 and selectively open in situations requiring decompression braking, such as ABS release mode, thereby discharging the pressurized medium applied to the third wheel cylinder 23 and the fourth wheel cylinder 24 through the second auxiliary reservoir flow path 1720 described below to the auxiliary reservoir 1100b. The third outlet valve 1522a and the fourth outlet valve 1522b may be configured as normally closed solenoid valves that open upon receiving an electrical signal from the electronic control unit.

[0098] The pedal simulator 1250 is configured to provide a reaction force to the pedal force applied to the brake pedal 10 operated by the driver.

[0099] The front end of the pedal simulator 1250 is connected to the simulation flow path 421 of the second connection line 420 described below, and the rear end is connected to the auxiliary reservoir 1100b through the simulator discharge flow path 1251.

[0100] The pedal simulator 1250 includes: a simulator valve 421a disposed in a simulated flow path 421 branching from and connected to a second connecting line 420 to control the flow of a pressurized medium; a simulated piston 1252a disposed displaceable according to the pressurized medium flowing in through the simulated flow path 421; a simulated chamber 1252b whose volume changes according to the displacement of the simulated piston 1252a and is connected to a rear simulator discharge flow path 1251; and a simulated spring 1252c elastically supporting the simulated piston 1252a.

[0101] The simulated flow path 421 can branch from the second connecting line 420 and connect to the front end of the pedal simulator 1250. A simulator valve 421a can be provided in the simulated flow path 421 to control the flow of the pressurized medium. The simulator valve 421a can be configured as a normally closed solenoid valve that is normally closed. When the driver applies pedal force to the brake pedal 10, the simulator valve 421a opens, thereby allowing the pressurized medium flowing from the second main chamber 1230a through the second connecting line 420 and the simulated flow path 421 to be transferred to the front surface of the simulated piston 1252a.

[0102] The simulated piston 1252a is configured to be displaceable within the simulated chamber 1252b via a pressurized medium flowing in through the second connecting line 420. Specifically, the hydraulic pressure of the pressurized medium flowing in through the simulated flow path 421 is transmitted to the front surface of the simulated piston 1252a (to... Figure 1 (based on the right side), causing the simulated piston 1252a to shift, and causing the rear surface of the simulated piston 1252a to be formed according to the shift of the simulated piston 1252a (with the right side as the reference). Figure 1 The volume of the simulation chamber 1252b (based on the left side) is reduced, so that the pressurized medium contained in the simulation chamber 1252b can be provided to the auxiliary reservoir 1100b through the simulator discharge path 1251. The simulation spring 1252c elastically supports the simulation piston 1252a, so it can be compressed according to the displacement of the simulation piston 1252a, and the elastic restoring force can be provided to the driver as the pedal feel.

[0103] On the other hand, in the accompanying drawings, the simulated spring 1252c is shown as an example of a helical spring, but apart from that, it can be implemented by various structures as long as it can provide elastic restoring force while providing elastic force to the simulated piston 1252a. As an example, it can be made of materials such as rubber, or formed by various components capable of storing elastic force, such as leaf springs.

[0104] The simulator discharge path 1251 is connected to the rear end of the pedal simulator 1250, with one end connected to the simulation chamber 1252b and the other end connected to the second auxiliary reservoir path 1720 described below. Thus, by connecting the simulation chamber 1252b and the auxiliary reservoir 1100b, pressurized medium discharged from the simulation chamber 1252b can be supplied to the auxiliary reservoir 1100b, or conversely, pressurized medium can be supplied from the auxiliary reservoir 1100b to the simulation chamber 1252b.

[0105] The operation of the pedal simulator 1250 is described as follows: When the driver operates the brake pedal 10 and applies pedal force, the first main piston 1220 and the second main piston 1230 move forward, causing the pressurized medium in the second main chamber 1230a to be supplied to the front surface of the simulated piston 1252a via the second connecting line 420 and the simulated flow path 421, and pressurized. For this purpose, the simulator valve 421a is opened. Therefore, the simulated piston 1252a is displaced, thereby compressing the simulated spring 1252c, and the elastic restoring force of the simulated spring 1252c can be provided to the driver as the pedal feel. At this time, the pressurized medium filling the simulated chamber 1252b is transferred to the auxiliary reservoir 1100b via the simulator discharge flow path 1251 and the second auxiliary reservoir flow path 1720. Subsequently, when the driver releases the brake pedal 10, the simulated spring 1252c expands according to its elastic restoring force, thereby resetting the simulated piston 1252a to its original position. The pressurized medium on the front surface of the simulated piston 1252a returns to the second main chamber 1230a through the simulated flow path 421 and the second connecting line 420. The pressurized medium is supplied from the auxiliary reservoir 1100b sequentially through the second auxiliary reservoir flow path 1720 and the simulator discharge flow path 1251 into the simulated chamber 1252b. Therefore, the interior of the simulated chamber 1252b can be refilled with the pressurized medium.

[0106] As described above, the interior of the simulation chamber 1252b is always filled with pressurized medium. Therefore, when the pedal simulator 1250 is in operation, the friction of the simulation piston 1252a is minimized, which not only improves the durability of the pedal simulator 1250, but also prevents impurities from flowing in from the outside.

[0107] On the other hand, the auxiliary reservoir 1100b can be divided into multiple chambers by a partition 1105b. The auxiliary reservoir 1100b may include multiple auxiliary reservoir chambers 1101b, 1102b, and 1103b, and the multiple auxiliary reservoir chambers 1101b, 1102b, and 1103b may be arranged side by side in a row. Specifically, the auxiliary reservoir 1100b may be divided into a first auxiliary reservoir chamber 1101b located in the center, a second auxiliary reservoir chamber 1102b located on one side, and a third auxiliary reservoir chamber 1103b located on the other side.

[0108] Partitions 1105b can be disposed between adjacent sub-reservoir chambers, and each partition 1105b can be configured to have at least a partial opening at its upper end. Thus, adjacent sub-reservoir chambers 1101b, 1102b, and 1103b are interconnected, allowing the pressurized medium to move. As an example, when a significant amount of pressurized medium flows into the first sub-reservoir chamber 1101b, the pressurized medium can pass through the upper end of partition 1105b and be transferred to the second sub-reservoir chamber 1102b or the third sub-reservoir chamber 1103b.

[0109] The first auxiliary reservoir chamber 1101b and the third auxiliary reservoir chamber 1103b can be connected to the first discharge control unit and the second discharge control unit, respectively. The second auxiliary reservoir chamber 1102b can be connected to the third connecting line 430 and the first hydraulic circuit 1510 and the second hydraulic circuit 1520, so that the pressurized medium can be transmitted to each other.

[0110] As described above, by dividing the auxiliary reservoir 1100b into first auxiliary reservoir chambers 1101b, 1102b, and 1103b, the stable operation of the electronic braking system 1 can be ensured. As an example, when the auxiliary reservoir 1100b is formed by a single chamber and the amount of pressurized medium is insufficient, it is impossible to stably supply pressurized medium not only to the main reservoir 1100a but also to the discharge control unit 1800 and the hydraulic supply device 1300. Therefore, by dividing the auxiliary reservoir 1100b into first auxiliary reservoir chambers 1101b, 1102b, and 1103b, pressurized medium can be supplied to other components even when it is impossible to supply pressurized medium to any one component, thereby achieving vehicle braking.

[0111] The auxiliary reservoir flow path is configured to hydraulically connect the first hydraulic circuit 1510, the second hydraulic circuit 1520, and the hydraulic supply device 1300 to the auxiliary reservoir 1100b. The auxiliary reservoir flow path may include: a first auxiliary reservoir flow path 1710, connecting the auxiliary reservoir 1100b and the rear end of the first hydraulic circuit 1510; a second auxiliary reservoir flow path 1720, connecting the auxiliary reservoir 1100b and the rear end of the second hydraulic circuit 1520; a third auxiliary reservoir flow path 1730, connecting the auxiliary reservoir 1100b and the first discharge control unit; and a fourth auxiliary reservoir flow path 1740, connecting the auxiliary reservoir 1100b and the second discharge control unit.

[0112] One end of the first auxiliary reservoir flow path 1710 can be connected to the second auxiliary reservoir chamber 1102b of the auxiliary reservoir 1100b, and the other end can be connected to the downstream side of the first outlet valve 1512a and the second outlet valve 1512b of the first hydraulic circuit 1510. Additionally, one end of the second auxiliary reservoir flow path 1720 can be connected to the second auxiliary reservoir chamber 1102b of the auxiliary reservoir 1100b, and the other end can be connected to the downstream side of the third outlet valve 1522a and the fourth outlet valve 1522b of the second hydraulic circuit 1520, and its middle end can merge with the simulator discharge flow path 1251. In addition, one end of the third auxiliary reservoir flow path 1730 can be connected to the third auxiliary reservoir chamber 1103b of the auxiliary reservoir 1100b, and the other end can be connected to the first discharge control unit side. One end of the fourth auxiliary reservoir flow path 1740 can be connected to the first auxiliary reservoir chamber 1101b of the auxiliary reservoir 1100b, and the other end can be connected to the second discharge control unit side.

[0113] The check valve 1900 is configured to diagnose or determine whether the master cylinder 1200 is leaking. The check valve 1900 can be positioned at the front end of the branch of the analog flow path 421 on the second connection line 420 described below to control the flow of the pressurized medium. In check mode, the check valve 1900 can block the discharge of the pressurized medium from the second main chamber 1230a through the second connection line 420, thereby checking for leaks in the master cylinder 1200. For this purpose, the check valve 1900 can be configured as a normally open solenoid valve that is open under normal conditions and closes upon receiving an electrical signal from the electronic control unit.

[0114] The electronic components may include: a loop pressure sensor PS1, which senses the hydraulic pressure of the pressurized medium supplied by the hydraulic supply device 1300; and a cylinder pressure sensor PS2, which senses the hydraulic pressure of the first main chamber 1220a. The loop pressure sensor PS1 may be disposed on the second hydraulic circuit 1520 side to sense the hydraulic pressure of the pressurized medium generated from the hydraulic supply device 1300 and pumped into the second hydraulic circuit 1520. The cylinder pressure sensor PS2 may be disposed on the first connection line 410 described below between the first main chamber 1220a and the first shut-off valve 411 to sense the hydraulic pressure of the pressurized medium in the first main chamber 1220a. The pressure values ​​of the pressurized medium sensed by the loop pressure sensor PS1 and the cylinder pressure sensor PS2 can be sent to the electronic control unit (ECU). The ECU can then execute a check mode or acquire vehicle driving or braking information based on the hydraulic pressure values ​​sensed by the loop pressure sensor PS1 and the cylinder pressure sensor PS2.

[0115] Additionally, the electronic components may include: a first shut-off valve 411, provided on the first connection line 410 described below to control the flow of the pressurized medium; and a second shut-off valve 422a, provided on the spare line 422 of the second connection line 420 described below to control the flow of the pressurized medium. This will be described in detail below.

[0116] The connecting line 400 is configured to hydraulically connect the first block 100 of the mechanism section and the second block 200 of the electronic section, which are separated from each other.

[0117] The connecting line 400 may include: a first connecting line 410 connecting the main cylinder 1200 of the mechanism to the first hydraulic circuit 1510 side of the hydraulic control unit 1400; a second connecting line 420 connecting the main cylinder 1200 to the second hydraulic circuit 1520 and pedal simulator 1250 side of the hydraulic control unit 1400; and a third connecting line 430 connecting the main reservoir 1100a of the mechanism and the auxiliary reservoir 1100b of the electronics to each other.

[0118] One end of the first connecting line 410 can be connected to the first main chamber 1220a of the master cylinder 1200, and the other end can be connected to the downstream or rear end side of the first inlet valve 1511a and the second inlet valve 1512a of the first hydraulic circuit 1510.

[0119] The first connecting line 410 is equipped with a first shut-off valve 411, which controls the flow of pressurized medium between the first main chamber 1220a of the master cylinder 1200 and the first hydraulic circuit 1510. The first shut-off valve 411 can be configured as a normally open solenoid valve that is normally open and closes when a shut-off signal is received from the electronic control unit.

[0120] In normal operating mode, which is a typical braking situation, the first shut-off valve 411 is controlled to be closed. Therefore, even if the brake pedal 10 is applied, the pressurized medium contained in the first main chamber 1220a will not be transmitted to the first hydraulic circuit 1510 side. In addition, in normal operating mode, the first shut-off valve 411 is controlled to be closed, so the hydraulic pressure from the pressurized medium supplied from the hydraulic supply device 1300 can be stably supplied along the first connection line 410 toward the wheel cylinders 21, 22, 23, and 24 without leakage to the master cylinder 1200 side.

[0121] However, in the fallback mode when the electronics are inoperable, the first shut-off valve 411 is set to the open state. Therefore, the pressurized medium discharged from the first main chamber 1220a of the master cylinder 1200 can be supplied to the first wheel cylinder 21 and the second wheel cylinder 22 through the first connecting line 410, thereby achieving braking.

[0122] One end of the second connecting line 420 can be connected to the second main chamber 1230a of the master cylinder 1200, and the other end can be branched into a simulation flow path 421 connected to the front end of the pedal simulator 1250 and a spare line 422 connected to the downstream or rear end side of the third inlet valve 1521a and the fourth inlet valve 1522a of the second hydraulic circuit 1520.

[0123] The backup line 422 is equipped with a second shut-off valve 422a, which controls the flow of pressurized medium between the second main chamber 1230a of the master cylinder 1200 and the second hydraulic circuit 1520. The second shut-off valve 422a can be configured as a normally open solenoid valve that operates to close the valve when a shut-off signal is received from the electronic control unit.

[0124] In normal operating mode, which is a typical braking situation, the second shut-off valve 422a is controlled to be closed. Therefore, even if the brake pedal force 10 is applied, the pressurized medium contained in the second main chamber 1230a will not be transmitted to the second hydraulic circuit 1520 side. In addition, in normal operating mode, the second shut-off valve 422a is controlled to be closed, so the hydraulic pressure of the pressurized medium supplied from the hydraulic supply device 1300 can be stably supplied along the backup line 422 toward the wheel cylinders 21, 22, 23, and 24 without leakage to the master cylinder 1200 side.

[0125] However, in the standby mode when the electronics are inoperable, the second shut-off valve 422a is set to the open state. Therefore, the pressurized medium discharged from the second main chamber 1230a of the master cylinder 1200 can be supplied to the third wheel cylinder 23 and the fourth wheel cylinder 24 through the standby line 422, thereby achieving braking.

[0126] One end of the third connection line 430 can be connected to the main reservoir 1100a, and the other end can be connected to the auxiliary reservoir 1100b. When there is too much or too little pressurized medium in the reservoir on one side of the third connection line 430, the third connection line 430 allows the transfer of pressurized medium between the reservoirs, thereby ensuring a smooth supply of pressurized medium to each component.

[0127] The first connecting line 410 and the second connecting line 420 can be configured as pipes with a specified strength, and the third connecting line 430 can be configured as a flexible hose. The pressurized medium forming hydraulic pressure from the first main chamber 1220a and the second main chamber 1230a is transmitted to the first connecting line 410 and the second connecting line 420. The first connecting line 410 and the second connecting line 420 can be configured as pipes with strength capable of withstanding hydraulic pressure to ensure product durability and performance. On the other hand, the third connecting line 430 is configured to connect to the main reservoir 1100a or the auxiliary reservoir 1100b with an internal pressure at atmospheric pressure, and no pressurized medium forming hydraulic pressure is transmitted to the third connecting line 430. Therefore, it can be configured as a flexible hose or the like to ensure ease of installation according to the installation positions of the first block 100 and the second block 200. The first connecting line 410 and the second connecting line 420 can be installed on the vehicle body using fastening members (not shown) with a specified restoring force to maintain connectivity even under impacts such as vehicle accidents.

[0128] The electronic braking system 2 according to the second embodiment of the present invention will be described below.

[0129] Figure 2 This is a hydraulic circuit diagram showing the electronic braking system 2 according to a second embodiment of the present invention, with reference to... Figure 2 The electronic braking system 2 according to the second embodiment may further include: a first circuit pressure sensor PS11 for sensing the hydraulic pressure of the pressurized medium transmitted to the first hydraulic circuit 1510; and a second circuit pressure sensor PS12 for sensing the hydraulic pressure of the pressurized medium transmitted to the second hydraulic circuit 1520.

[0130] In the following description of the electronic braking system 2 according to the second embodiment of the present invention, except where further explanation is given by additional reference numerals, the remainder is the same as the description of the electronic braking system 1 according to the first embodiment of the present invention described above, and therefore the description will be omitted to prevent repetition.

[0131] The first-loop pressure sensor PS11 senses the hydraulic pressure generated by the hydraulic supply device 1300 and supplied to the first hydraulic circuit 1510, and sends the pressure value information to the electronic control unit. Similarly, the second-loop pressure sensor PS12 senses the hydraulic pressure generated by the hydraulic supply device 1300 and supplied to the second hydraulic circuit 1520, and sends the pressure value information to the electronic control unit. The electronic control unit can receive the hydraulic pressure value information for each hydraulic circuit from the first-loop pressure sensor PS11 and the second-loop pressure sensor PS12, and thereby control the operation of the hydraulic supply device 1300, thus assisting in vehicle autonomous driving and braking, such as highway driving assistance and emergency braking.

[0132] As an example, the first wheel cylinder 21 and the second wheel cylinder 22 set in the first hydraulic circuit 1510 can be allocated to the left front wheel FL and the right rear wheel RR, respectively. The third wheel cylinder 23 and the fourth wheel cylinder 24 set in the second hydraulic circuit 1520 can be allocated (X-split) to the left rear wheel RL and the right front wheel FR, respectively. The first circuit pressure sensor PS11 can sense and transmit the hydraulic pressure applied to the wheel cylinders of the left front wheel and the right rear wheel. The second circuit pressure sensor PS12 can sense and transmit the hydraulic pressure applied to the wheel cylinders of the left rear wheel and the right front wheel.

[0133] The electronic control unit can automatically adjust and control the vehicle's braking pressure based on the hydraulic information of the wheel cylinders received from the first circuit pressure sensor PS11 and the second circuit pressure sensor PS12, thereby ensuring the driver's driving convenience.

Claims

1. An electronic braking system, characterized in that, include: The first part is equipped with a mechanism that is mechanically operated in conjunction with the brake pedal; The second part is provided with an electronic unit that is operated and controlled by an electronic control unit, and the second part is separated from the first part. as well as A connecting line hydraulically connects the first and second blocks to each other. The mechanism includes a main cylinder, and the main cylinder includes: The first master piston is connected to the brake pedal; The volume of the first main chamber changes according to the displacement of the first main piston; The second main piston is configured to be displaced according to the hydraulic pressure in the first main chamber; and The volume of the second main chamber changes according to the displacement of the second main piston. The second main piston is disposed between the first main chamber and the second main chamber. The electronic components include: Check the valve; Pedal simulator; A hydraulic supply device that operates a hydraulic piston to generate hydraulic pressure based on an electrical signal; and The hydraulic control unit includes: a first hydraulic circuit for controlling the hydraulic pressure transmitted to two wheel cylinders; and a second hydraulic circuit for controlling the hydraulic pressure transmitted to two other wheel cylinders. The connecting line includes: A first connecting line, one end of which is connected to the first main chamber, and the other end of which is connected to the first hydraulic circuit side; and The second connecting line has one end connected to the second main chamber via a fourth hydraulic port formed in the cylinder body of the main cylinder, which is located at the front end of the main chamber and is forward of the first main chamber. The other end is branched into a simulation flow path connected to the front end of the pedal simulator and a spare line connected to the second hydraulic circuit side. The inspection valve is provided at the front end of the branch position.

2. The electronic braking system according to claim 1, wherein, The mechanism further includes a main reservoir for storing pressurized medium. The electronic components further include a secondary reservoir for storing the pressurized medium. The connecting line further includes a third connecting line, one end of which is connected to the main reservoir and the other end of which is connected to the auxiliary reservoir.

3. The electronic braking system according to claim 2, wherein, The electronic component further includes: A first shut-off valve is installed on the first connecting line to control the flow of the pressurized medium; and A second shut-off valve is installed on the spare line to control the flow of the pressurized medium.

4. The electronic braking system according to claim 3, wherein, The electronic component further includes a simulator valve disposed in the simulated flow path to control the flow of the pressurized medium.

5. The electronic braking system according to claim 4, wherein, The electronic component further includes: The first auxiliary reservoir flow path connects the auxiliary reservoir and the rear end of the first hydraulic circuit; and The second auxiliary reservoir flow path connects the auxiliary reservoir and the rear end of the second hydraulic circuit.

6. The electronic braking system according to claim 5, wherein, The electronics further include a simulator discharge path connected to the rear end of the pedal simulator. The simulator discharge path merges into the second auxiliary reservoir path and is connected to the auxiliary reservoir.

7. The electronic braking system according to claim 5, wherein, The hydraulic supply device includes a first pressure chamber located in front of the hydraulic piston and a second pressure chamber located behind the hydraulic piston.

8. The electronic braking system according to claim 7, wherein, The electronic component further includes: A discharge control unit is located between the auxiliary reservoir and the hydraulic supply device to control the flow of the pressurized medium. The discharge control unit includes: The first discharge control unit controls the flow of the pressurized medium between the first pressure chamber and the auxiliary reservoir; and The second discharge control unit controls the flow of the pressurized medium between the second pressure chamber and the auxiliary reservoir.

9. The electronic braking system according to claim 8, wherein, The electronic component further includes: The third auxiliary liquid reservoir flow path connects the auxiliary liquid reservoir and the first discharge control unit; and The fourth auxiliary liquid reservoir flow path connects the auxiliary liquid reservoir and the second discharge control unit.

10. The electronic braking system according to claim 5, wherein, The first hydraulic circuit includes: The first inlet valve and the second inlet valve control the flow of pressurized medium supplied from the hydraulic supply device to the first wheel cylinder and the second wheel cylinder, respectively; and The first outlet valve and the second outlet valve control the flow of the pressurized medium discharged from the first wheel cylinder and the second wheel cylinder, respectively. The second hydraulic circuit includes: The third and fourth inlet valves control the flow of pressurized medium supplied from the hydraulic supply device to the third and fourth wheel cylinders, respectively; and The third and fourth outlet valves control the flow of the pressurized medium discharged from the third and fourth wheel cylinders, respectively. The pressurized medium discharged through the first and second outlet valves is supplied to the flow path of the first auxiliary reservoir. The pressurized medium discharged through the third and fourth outlet valves is supplied to the flow path of the second auxiliary reservoir.

11. The electronic braking system according to claim 2, wherein, The aforementioned department further includes: A first main reservoir flow path, connecting the main reservoir and the first main chamber; and The second main reservoir flow path connects the main reservoir and the second main chamber.

12. The electronic braking system according to claim 2, wherein, The first connecting line and the second connecting line are configured as rigid conduits. The third connecting line is configured as a flexible hose.

13. The electronic braking system according to claim 6, wherein, The pedal simulator includes: The simulated piston is configured to move according to the hydraulic pressure of the pressurized medium supplied from the simulated flow path; A simulated chamber, the volume of which changes according to the displacement of the simulated piston, and connected to the simulator's discharge path; and A simulated spring provides elastic support for the simulated piston.

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