KR20200138578A - Electric brake system and Operating method of thereof - Google Patents

Abstract

Disclosed is an electronic brake system. An electronic brake system according to an embodiment comprises: a reservoir in which a pressurized medium is stored; an integrated master cylinder having a master chamber and a simulation chamber; a reservoir flow path for communicating the integrated master cylinder and the reservoir; a hydraulic pressure supply device which generates hydraulic pressure by operating a hydraulic piston by an electrical signal which is output in response to the displacement of a brake pedal, and includes a first pressure chamber provided on one side of the hydraulic piston movably accommodated in a cylinder block and connected to one or more wheel cylinders, and a second pressure chamber provided on the other side of the hydraulic piston and connected to the one or more wheel cylinders; a hydraulic control unit having a first hydraulic circuit for controlling hydraulic pressure delivered to two wheel cylinders and a second hydraulic circuit for controlling hydraulic pressure delivered to two other wheel cylinders; and an electronic control unit which controls valves based on hydraulic pressure information and brake pedal displacement information. Therefore, the system can reduce the number of parts and achieve size and weight reduction of a product.

Description

TECHNICAL FIELD [0001] Electric brake system and operating method of thereof

The present invention relates to an electronic brake system and a method of operating the same, and more particularly, to an electronic brake system for generating a braking force using an electric signal corresponding to a displacement of a brake pedal, and a method of operating the same.

Vehicles are essentially equipped with a brake system for performing braking, and various types of brake systems have been proposed for the safety of drivers and passengers.

In the conventional brake system, when the driver presses the brake pedal, a method of supplying hydraulic pressure required for braking to a wheel cylinder using a mechanically connected booster has been mainly used. However, as the demand of the market to implement various braking functions in detail in response to the operating environment of the vehicle is increasing, recently, when the driver presses the brake pedal, the driver's braking will is electrically controlled from a pedal displacement sensor that senses the displacement of the brake pedal. An electronic brake system that receives a signal and operates a hydraulic pressure supply device based on this to supply hydraulic pressure required for braking to a wheel cylinder has been widely spread.

In such an electronic brake system, the driver's brake pedal operation is generated and provided as an electrical signal in the normal operation mode, and based on this, the hydraulic pressure supply device is electrically operated and controlled to form the hydraulic pressure required for braking and transmit it to the wheel cylinder. As described above, since these electronic brake systems and operating methods are electrically operated and controlled, they can implement complex and various braking actions, but when a technical problem occurs in an electrical component element, the hydraulic pressure required for braking is not stably formed. There is a risk of threatening the safety of passengers.

Therefore, the electronic brake system enters an abnormal operation mode when a component element fails or is in a state of inability to control. In this case, a mechanism in which the driver's brake pedal operation is directly linked to the wheel cylinder is required. In other words, in the abnormal operation mode of the electronic brake system, the hydraulic pressure required for braking is immediately formed as the driver applies a pedal effort to the brake pedal, and it must be transmitted directly to the wheel cylinder.

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

The present embodiment is to provide an electronic brake system capable of reducing the number of parts to be applied and miniaturization and weight reduction of products.

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

The present embodiment is to provide an electronic brake system capable of stably generating a high-pressure braking pressure.

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

The present embodiment is to provide an electronic brake system with improved durability of a product by reducing a load applied to a component element.

The present embodiment is to provide an electronic brake system capable of improving product assembly and productivity while reducing manufacturing cost of products.

According to an aspect of the present invention, an integrated master cylinder having a reservoir storing a pressurized medium, a master chamber, and a simulation chamber, a reservoir flow path communicating the integrated master cylinder and the reservoir, and output corresponding to the displacement of the brake pedal The hydraulic piston is operated by an electrical signal to generate hydraulic pressure, but is provided on one side of the hydraulic piston that is movably accommodated in the cylinder block and is provided on the first pressure chamber connected to one or more wheel cylinders and the other side of the hydraulic piston. A hydraulic pressure supply device including a second pressure chamber connected to one or more wheel cylinders, a first hydraulic circuit controlling hydraulic pressure delivered to two wheel cylinders, and a second hydraulic circuit controlling hydraulic pressure delivered to two other wheel cylinders And an electronic control unit for controlling valves based on hydraulic pressure information and displacement information of the brake pedal, wherein the hydraulic control unit includes a first hydraulic flow passage in communication with the first pressure chamber, and the The second and third hydraulic flow paths branched from the first hydraulic flow path and connected to the first and second hydraulic circuits, respectively, and a fourth hydraulic flow path that communicates with the second pressure chamber, and branched from the fourth hydraulic flow path. A fifth hydraulic flow path connected to the first hydraulic flow path, and a sixth hydraulic flow path branched from the fourth hydraulic flow path and connected to the second hydraulic flow path may be provided.

The hydraulic control unit includes a first valve provided in the first hydraulic passage to control the flow of the pressurized medium, a second valve provided in the second hydraulic passage to control the flow of the pressurized medium, and provided in the fifth hydraulic passage It may be provided, including a third valve for controlling the flow of the pressurized medium, and a fourth valve provided in the sixth hydraulic flow path for controlling the flow of the pressurized medium.

The first to third valves are provided as solenoid valves that control the flow of the pressurized medium in both directions, and the fourth valve is a check valve that allows only the flow of the pressurized medium from the fourth hydraulic channel to the second hydraulic channel. Can be provided.

The simulation chamber includes a first simulation chamber and a second simulation chamber, and the integrated master cylinder is provided in the master chamber, a master piston disposed to be displaceable by a brake pedal, and a master piston provided in the first simulation chamber, The first simulation piston provided to be displaceable by the displacement of the master piston or the hydraulic pressure of the pressurized medium accommodated in the master chamber, and the displacement of the first simulation piston provided in the second simulation chamber or of the first simulation chamber. A second simulation piston provided to be displaceable by hydraulic pressure, an elastic member provided between the first simulation piston and the second simulation piston, a simulation flow path connecting the first simulation chamber and the second simulation chamber, , A simulator valve provided in the simulation flow path to control the flow of the pressurized medium, and a simulator spring elastically supporting the second simulation piston.

A first backup passage connecting the master chamber and the first hydraulic circuit, a second backup passage connecting the first simulation chamber and the second hydraulic circuit, and provided in the first backup passage to control the flow of the pressurized medium. It may further include a first cut valve and a second cut valve provided in the second backup passage and controlling the flow of the pressurized medium.

The reservoir flow path may include a first reservoir flow path connecting the reservoir and the master chamber, and a second reservoir flow path connecting the reservoir and the first simulation chamber.

A reservoir valve provided in the second reservoir flow path may be provided to control the flow of the pressurized medium.

The first hydraulic circuit includes a first inlet valve and a second inlet valve respectively controlling the flow of the pressurized medium supplied to the first wheel cylinder and the second wheel cylinder, and from the first wheel cylinder and the second wheel cylinder to the reservoir. It includes a first outlet valve and a second outlet valve respectively controlling the flow of the discharged pressurized medium, and the second hydraulic circuit is a third wheel cylinder and a second outlet valve respectively controlling the flow of the pressurized medium supplied to the fourth wheel cylinder. And a third outlet valve that controls a flow of the pressurized medium discharged from the third wheel cylinder to the reservoir, and the second backup flow channel includes the first simulation chamber and the fourth inlet valve. It may be provided to connect the downstream side of the inlet valve.

It may further include a generator provided in each of the first wheel cylinder and the second wheel cylinder.

Further comprising a dump control unit provided between the reservoir and the hydraulic pressure supply device to control the flow of the pressurized medium, wherein the dump control unit comprises a first dump passage connecting the second pressure chamber and the reservoir, and the first pressure chamber And a second dump passage connecting the reservoir and a first dump check valve provided in the first dump passage and allowing only the flow of the pressurized medium from the reservoir to the second pressure chamber, and provided in the second dump passage A second dump check valve that allows only the flow of the pressurized medium from the reservoir to the first pressure chamber, a first bypass flow path connected in parallel with respect to the first dump check valve on the first dump flow path, the It may be provided including a first dump valve provided in the first bypass flow path to control the flow of the pressurized medium in both directions.

The hydraulic control unit may further include a seventh hydraulic flow path connected in parallel with the first valve on the first hydraulic flow path, and a fifth valve provided in the seventh hydraulic flow path to control the flow of the pressurized medium. I can.

The fifth valve may be provided as a check valve that allows only the flow of the pressurized medium discharged from the first pressure chamber.

The dump control unit includes a second bypass flow path connected in parallel to the second dump check valve on the second dump flow path, and a second dump valve provided in the second bypass flow path to control flow of the pressurized medium in both directions. It may be provided further including.

According to the operating method of the present invention, in the normal operation mode, the first cut valve is closed to seal the master chamber, the simulator valve is closed to seal the second simulation chamber, and the second cut valve is closed. However, the reservoir valve is opened to communicate the first simulation chamber and the reservoir, so that the first simulation piston compresses the elastic member by the operation of the brake pedal, and the elastic restoring force of the elastic member gives the driver a pedal feeling. Can be provided.

In the normal operation mode, as the hydraulic pressure of the pressurized medium transferred from the hydraulic pressure supply device to the wheel cylinder gradually increases, a first braking mode primarily provides hydraulic pressure, and a second braking mode secondarily provides hydraulic pressure. It can be provided including a mode.

In the first braking mode, the first valve and the second valve are opened, but the third valve is closed, and the hydraulic pressure formed in the first pressure chamber by the advance of the hydraulic piston is applied to the first hydraulic channel and the first valve. 2 It may be provided to the first hydraulic circuit through the hydraulic flow path sequentially, and may be provided to the second hydraulic circuit through the first hydraulic flow path and the third hydraulic flow path sequentially.

In the second braking mode, the second valve and the third valve are opened, but the first valve is closed. After the first braking mode, the hydraulic pressure formed in the second pressure chamber by the retraction of the hydraulic piston is It is provided to the first hydraulic circuit through the 4 hydraulic channel, the sixth hydraulic channel, and the second hydraulic channel in sequence, and the fourth hydraulic channel, the fifth hydraulic channel, the first hydraulic channel, and the third hydraulic oil It may be provided to the second hydraulic circuit through the furnace sequentially.

When the first braking mode is released, the first valve and the second valve are opened, but the third valve is closed, and a negative pressure is formed in the first pressure chamber by reversing the hydraulic piston. The pressurized medium provided in the circuit is sequentially returned to the first pressure chamber through the second hydraulic passage and the first hydraulic passage, and the pressurized medium provided in the second hydraulic circuit includes the third hydraulic passage and the first hydraulic oil. It can be recovered to the first pressure chamber through the furnace sequentially.

The release of the second braking mode opens the second valve and the third valve, but closes the first valve, and generates negative pressure in the second pressure chamber by advancing the hydraulic piston, thereby forming the first hydraulic pressure. The pressurizing medium provided in the circuit is recovered to the second pressure chamber through the second hydraulic flow path, the first hydraulic flow path, the fifth hydraulic flow path, and the fourth hydraulic flow path sequentially, and the pressure provided to the second hydraulic circuit The medium may be recovered to the second pressure chamber through the third hydraulic channel, the first hydraulic channel, the fifth hydraulic channel, and the fourth hydraulic channel in sequence.

In the abnormal operation mode, the first cut valve is opened to communicate with the master chamber and the first hydraulic circuit, and the reservoir valve is closed, but the second cut valve is opened to open the first simulation chamber and the second hydraulic circuit. The circuit is communicated, the simulator valve is opened, and the first simulation chamber and the second simulation chamber are communicated, and the pressurizing medium of the master chamber according to the pedal effort of the brake pedal is transferred to the first backup channel through the first backup channel. It is provided as a hydraulic circuit, and the pressurizing medium of the first simulation chamber and the second simulation chamber may be provided to the second hydraulic circuit through the second backup passage.

In the regenerative braking mode by the generator, the first valve is opened but the second valve is closed, and the hydraulic pressure formed in the first pressure chamber by the advance of the hydraulic piston is the first hydraulic flow path and the third hydraulic oil. It is provided to the second hydraulic circuit through the furnace sequentially, it is possible to block the supply of hydraulic pressure to the first wheel cylinder and the second wheel cylinder.

The electronic brake system according to the present embodiment can reduce the number of parts and achieve miniaturization and weight reduction of products.

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 the present embodiment can stably generate a high-pressure braking pressure.

The electronic brake system according to the present embodiment may improve product performance and operational reliability.

The electronic brake system according to the present embodiment can stably provide a braking pressure even when a component element fails or a pressurized medium leaks.

The electronic brake system according to the present embodiment has an effect of improving durability of a product by reducing a load applied to a component element.

The electronic brake system according to the present embodiment can improve product assembly and productivity, and at the same time reduce the manufacturing cost of the product.

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 a state in which the electronic brake system according to the first embodiment of the present invention performs a first braking mode.
3 is a hydraulic circuit diagram showing a state in which the electronic brake system according to the first embodiment of the present invention performs a second braking mode.
4 is a hydraulic circuit diagram showing a state in which the electronic brake system according to the first embodiment of the present invention releases a second braking mode.
5 is a hydraulic circuit diagram showing a state in which the electronic brake system according to the first embodiment of the present invention releases a first braking mode.
6 is a hydraulic circuit diagram showing a state in which the electronic brake system according to the first embodiment of the present invention performs an abnormal operation mode (fallback mode).
7 is a hydraulic circuit diagram showing a state in which the electronic brake system according to the first embodiment of the present invention performs a regenerative braking mode.
8 is a hydraulic circuit diagram showing an electronic brake system according to a second embodiment of the present invention.
9 is a hydraulic circuit diagram showing an electronic brake system according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are presented in order to sufficiently convey the spirit of the present invention to those of ordinary skill in the art to which the present invention pertains. The present invention is not limited to the exemplary embodiments presented here, but may be embodied in other forms. In the drawings, in order to clarify the present invention, portions not related to the description may be omitted, and sizes 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, the electronic brake system 1000 according to the first embodiment of the present invention provides a reaction force according to the foot of the brake pedal 10 and a reservoir 1100 in which a pressurized medium is stored, and at the same time, An integrated master cylinder 1200 that pressurizes and discharges a pressurized medium such as brake oil contained inside, and a pedal displacement sensor 11 that senses the displacement of the brake pedal 10, receives the driver's braking intention as an electrical signal. The hydraulic pressure supply device 1300 for generating hydraulic pressure of the pressurized medium through mechanical operation, the hydraulic control unit 1400 for controlling the hydraulic pressure provided from the hydraulic pressure supply device 1300, and the hydraulic pressure of the pressurized medium are transmitted to each wheel It is provided between hydraulic circuits 1510 and 1520 having wheel cylinders 20 for braking (RR, RL, FR, FL), and between the hydraulic pressure supply device 1300 and the reservoir 1100 to prevent the flow of the pressurized medium. A control dump control unit 1800, backup flow paths 1610, 1620 hydraulically connecting the integrated master cylinder 1200 and the hydraulic circuits 1510, 1520, and the reservoir 1100 and the integrated master cylinder 1200 It includes a reservoir flow path 1700 that is hydraulically connected, and an electronic control unit (ECU, not shown) that controls the hydraulic pressure supply device 1300 and various valves based on hydraulic pressure information and pedal displacement information.

The integrated master cylinder 1200 includes simulation chambers 1230a and 1240a and a master chamber 1220a, and when the driver applies a foot force to the brake pedal 10 for braking operation, a reaction force is provided to the driver to provide a stable It is provided to pressurize and discharge the pressurized medium accommodated in the inside while providing a pedal feel.

The integrated master cylinder 1200 may be divided into a pedal simulation unit that provides a pedal feeling to the driver and a master cylinder unit that delivers a pressurized medium to the first hydraulic circuit 1510 to be described later. The integrated master cylinder 1200 is sequentially provided with a master cylinder part and a pedal simulation part from the brake pedal 10 side, and may be disposed coaxially within one cylinder block 1210.

Specifically, the integrated master cylinder 1200 includes a cylinder block 1210 forming a chamber inside, a master chamber 1220a formed at the inlet side of the cylinder block 1210 to which the brake pedal 10 is connected, and the master A master piston 1220 provided in the chamber 1220a and connected to the brake pedal 10 to be displaceable by the operation of the brake pedal 10, and a piston spring (not shown) for elastically supporting the master piston 1220 ), and a first simulation chamber 1230a formed inside the master chamber 1220a on the cylinder block 1210, and provided in the first simulation chamber 1230a, the displacement of the master piston 1220 or the master chamber ( A first simulation piston 1230 provided to be displaceable by the hydraulic pressure of the pressurized medium accommodated in 1220a), and a second simulation chamber 1240a formed inside the first simulation chamber 1230a on the cylinder block 1210 Wow, a second simulation piston 1240 provided in the second simulation chamber 1240a and provided to be displaceable by the displacement of the first simulation piston 1230 or the hydraulic pressure of the pressurized medium accommodated in the first simulation chamber 1230a, , An elastic member 1250 disposed between the first simulation piston 1230 and the second simulation piston 1240 to provide a pedal feel through elastic restoring force generated during compression, and elastically supporting the second simulation piston 1240. A simulator spring 1270, a simulation flow path 1260 connecting the first simulation chamber 1230a and the second simulation chamber 1240a, and a simulator valve 1261 provided in the simulation flow path 1260 to control the flow of the pressurized medium. ) Can be included.

The master chamber 1220a, the first simulation chamber 1230a, and the second simulation chamber 1240a are on the cylinder block 1210 of the integrated master cylinder 1200 from the brake pedal 10 side (right side based on FIG. 1). It may be formed sequentially inward (left with reference to FIG. 1). In addition, the master piston 1220, the first simulation piston 1230, and the second simulation piston 1240 are provided in the master chamber 1220a, the first simulation chamber 1230a, and the second simulation chamber 1240a, respectively, and advance and According to the backward movement, a hydraulic pressure or negative pressure may be formed in the pressurized medium accommodated in each chamber.

The master chamber 1220a may be formed on the inlet side or the outermost side (right side based on FIG. 1) of the cylinder block 1210, and the master chamber 1220a includes the brake pedal 10 via the input rod 12. The master piston 1220 connected to the reciprocating motion may be accommodated.

In the master chamber 1220a, a pressurized medium may be introduced and discharged through the first hydraulic port 1280a and the second hydraulic port 1280b. The first hydraulic port 1280a is connected to a first reservoir flow path 1710, which will be described later, so that a pressurized medium can flow into the master chamber 1220a from the reservoir 1100, and the second hydraulic port 1280b is 1 The pressurized medium may be connected to the backup passage 1610 to be discharged from the master chamber 1220a toward the first backup passage 1610 or, conversely, the pressurized medium may be introduced from the first backup passage 1610 toward the master chamber 1220a. . Meanwhile, a pair of sealing members 1290a are provided at the front and rear of the first hydraulic port 1280a to prevent leakage of the pressurized medium.

The master piston 1220 is accommodated and provided in the master chamber 1220a, but by moving forward (to the left based on FIG. 1), the pressurized medium accommodated in the master chamber 1220a is pressurized to form a hydraulic pressure, or backward (see FIG. 1 ). It is possible to form a negative pressure in the interior of the master chamber 1220a by performing a right direction as a reference).

The first simulation chamber 1230a may be formed inside the master chamber 1220a on the cylinder block 1210 (left side based on FIG. 1), and the first simulation piston 1230 in the first simulation chamber 1230a It can be accommodated so as to be able to reciprocate.

In the first simulation chamber 1230a, a pressurized medium may be introduced and discharged through the third hydraulic port 1280c and the fourth hydraulic port 1280d. The third hydraulic port 1280c is connected to the second reservoir flow path 1720 and the second backup flow path 1620 to be described later, so that the pressurized medium accommodated in the first simulation chamber 1230a is provided with the reservoir 1100 and the second backup flow path ( 1620) may be discharged, on the contrary, the pressurized medium may be introduced from the reservoir 1100 and the second backup passage 1620. In addition, the fourth hydraulic port 1280d is connected to the simulation flow path 1260 to be described later, so that the pressurized medium may be introduced and discharged.

The first simulation piston 1230 is accommodated and provided in the first simulation chamber 1230a, but by moving forward, it can form a hydraulic pressure of the pressurized medium accommodated in the first simulation chamber 1230a or pressurize the elastic member 1250 to be described later. Further, by moving backward, negative pressure may be formed in the first simulation chamber 1230a or the elastic member 1250 may be returned to its original position and shape. At least one sealing member 1290b may be provided between the inner wall of the cylinder block 1210 and the outer circumferential surface of the first simulation piston 1230 to prevent leakage of the pressurized medium between adjacent chambers.

The second simulation chamber 1240a may be formed inside the first simulation chamber 1230a on the cylinder block 1210 (left side based on FIG. 1 ), and the second simulation chamber 1240a includes a second simulation piston ( 1240) may be accommodated to be reciprocating.

In the second simulation chamber 1240a, a pressurized medium may be introduced and discharged through the fifth hydraulic port 1280e. Specifically, the fifth hydraulic port 1280e is connected to the simulation flow path 1260 to be described later, and the pressurized medium is discharged toward the first simulation chamber 1230a, or the pressurized medium accommodated in the first simulation chamber 1230a may be introduced. have.

The second simulation piston 1240 is accommodated and provided in the second simulation chamber 1240a, but by advancing, it forms a hydraulic pressure of the pressurized medium accommodated in the second simulation chamber 1240a, or by reversing the second simulation chamber 1240a. It can form negative pressure. At least one sealing member 1290c may be provided between the inner wall of the cylinder block 1210 and the outer circumferential surface of the second simulation piston 1240 to prevent leakage of the pressurized medium between adjacent chambers.

On the other hand, the integrated master cylinder 1200 according to the present exemplary embodiment includes a master chamber 1220a and simulation chambers 1230a and 1240a, thereby ensuring safety in the event of a component element failure. For example, the master chamber 1220a includes any two wheel cylinders 20 of the right front wheel FR, the left front wheel FL, the left rear wheel RL, and the right rear wheel RR through a first backup passage 1610 to be described later. ), and the simulation chambers 1230a and 1240a may be connected to the other two wheel cylinders 20 through a second backup passage 1620 to be described later, and accordingly, leaks, etc. Even if a problem occurs, it may be possible to brake the vehicle. A detailed description of this will be described later with reference to FIG. 6.

The elastic member 1250 is interposed between the first simulation piston 1230 and the second simulation piston 1240, and is provided to provide a pedal feel of the brake pedal 10 to the driver by its own elastic restoring force. The elastic member 1250 may be made of a material such as compressible and expandable rubber, and displacement occurs in the first simulation piston 1230 by the operation of the brake pedal 10, but the second simulation piston 1240 is circular. When the position is maintained, the elastic member 1250 is compressed, and the driver can receive a stable and familiar pedal feeling by the elastic restoring force of the compressed elastic member 1250. A detailed description of this will be described later.

The rear surface of the first simulation piston 1230 facing the elastic member 1250 (the left side based on Fig. 1) and the front side of the second simulation piston 1240 (the right side based on Fig. 1) have an elastic member ( In order to facilitate smooth compression and deformation of the 1250, a receiving groove recessed in a shape corresponding to the shape of the elastic member 1250 may be provided, respectively.

The simulator spring 1270 is provided to elastically support the second simulation piston 1240. The simulator spring 1270 has one end supported by the cylinder block 1210 and the other end supported by the second simulation piston 1240, thereby elastically supporting the second simulation piston 1240. When the second simulation piston 1240 advances and displacement occurs according to the braking operation, the simulator spring 1270 is compressed. After that, when the braking is released, the simulator spring 1270 expands by an elastic force and the second simulation piston ( 1240) can return to the original position.

The simulation flow path 1260 is provided to communicate the first simulation chamber 1230a and the second simulation chamber 1240a with each other, and the simulation flow path 1260 includes a simulator valve 1261 that controls the flow of the pressurized medium in both directions. Can be provided. The simulator valve 1261 may be provided as a normal open type solenoid valve that is open normally and operates to close the valve upon receiving an electrical signal from the electronic control unit.

When explaining the pedal simulation operation by the integrated master cylinder 1200, the driver operates the brake pedal 10 during normal operation, and at the same time, the first backup passage 1610 and the second backup passage 1620 described later are respectively The provided first cut valve 1611 and the second cut valve 1621 are closed, and the simulator valve 1261 of the simulation flow path 1260 is also closed. On the other hand, the reservoir valve 1721 on the second reservoir flow path 1720 connected to the first simulation flow path 1260 is opened. As the operation of the brake pedal 10 proceeds, the master piston 1220 advances, but the master chamber 1220a is closed by the closing operation of the first cut valve 1611, thereby holding the pressurized medium contained in the master chamber 1220a. As the hydraulic pressure of is transmitted to the first simulation piston 1230, the first simulation piston 1230 advances and displacement occurs. On the other hand, as the simulator valve 1261 is closed, the second simulation chamber 1240a is closed so that the second simulation piston 1240 cannot be displaced. Accordingly, the displacement of the first simulation piston 1230 is caused by the elastic member 1250 ) Is compressed, and elastic restoring force due to compression of the elastic member 1250 may be provided to the driver as a pedal feel. At this time, the pressurized medium accommodated in the first simulation chamber 1230a is transferred to the reservoir 1100 through the second reservoir flow path 1720. Thereafter, when the driver releases the pedal effort of the brake pedal 10, the piston spring (not shown) and the elastic member 1250 return to their original shape and position by the elastic restoring force, and the first simulation chamber 1230a is a second reservoir. The pressurized medium may be supplied and filled from the reservoir 1100 through the flow path 1720.

As described above, since the inside of the first simulation chamber 1230a and the second simulation chamber 1240a is always filled with the pressurized medium, friction between the first simulation piston 1230 and the second simulation piston 1240 during pedal simulation operation This minimizes the durability of the integrated master cylinder 1200, as well as the inflow of foreign substances from the outside can be blocked.

Meanwhile, when the electronic brake system 1000 operates abnormally, that is, the operation of the integrated master cylinder 1200 in the fallback mode operation state will be described later with reference to FIG. 6.

The reservoir 1100 may accommodate and store a pressurized medium therein. The reservoir 1100 may be connected to respective component elements such as an integrated master cylinder 1200, a hydraulic pressure supply device 1300 to be described later, and a hydraulic circuit to be described later to supply or receive a pressurized medium. In the drawings, several reservoirs 1100 are shown with the same reference numerals, but this is an example for helping understanding of the invention, and the reservoir 1100 is provided as a single component or a plurality of separate and independent components. I can.

The reservoir flow path 1700 is provided to connect the integrated master cylinder 1200 and the reservoir 1100.

The reservoir flow path 1700 is a first reservoir flow path 1710 that connects the master chamber 1220a and the reservoir 1100, and a second reservoir flow path 1720 that connects the first simulation chamber 1230a and the reservoir 1100. It may include. To this end, one end of the first reservoir flow path 1710 is in communication with the master chamber 1220a of the integrated master cylinder 1200, the other end may be in communication with the reservoir 1100, and one end of the second reservoir flow path 1720 is It is in communication with the first simulation chamber 1230a of the integrated master cylinder 1200, the other end is in communication with the reservoir 1100, but the first backup passage 1610 to be described later is branched and provided at the middle portion.

The second reservoir flow path 1720 may be provided with a reservoir valve 1721 provided as a two-way control valve that controls the flow of the braking fluid transmitted through the second reservoir flow path 1720. The reservoir valve 1721 may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state. The reservoir valve 1721 may be opened in the normal operating mode of the electronic brake system 1000.

The hydraulic pressure supply device 1300 is provided to generate hydraulic pressure of the pressurized medium through mechanical operation by receiving the driver's braking intention as an electrical signal from the pedal displacement sensor 11 that senses the displacement of the brake pedal 10.

The hydraulic pressure supply device 1300 includes a hydraulic pressure providing unit that provides a 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 It may include a power conversion unit (not shown) that converts the rotary motion into linear motion and transmits it to the hydraulic pressure providing unit.

The hydraulic pressure supply unit is provided between the cylinder block 1310 to accommodate the pressurized medium, the hydraulic piston 1320 accommodated in the cylinder block 1310, and the hydraulic piston 1320 and the cylinder block 1310. It includes a sealing member 1350 for sealing the 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 positioned in front of the hydraulic piston 1320 (to the left of the hydraulic piston 1320 based on FIG. 1), and the rear of the hydraulic piston 1320 ( Referring to FIG. 1, a second pressure chamber 1340 positioned on the right side of the hydraulic piston 1320 may be included. That is, the first pressure chamber 1330 is partitioned by the cylinder block 1310 and the front surface of the hydraulic piston 1320 so that the volume is changed according to the movement of the hydraulic piston 1320, and the second pressure chamber 1340 ) Is partitioned by the cylinder block 1310 and the rear surface of the hydraulic piston 1320 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 flow path 1401 to be described later through a first communication hole 1360a formed in the cylinder block 1310, and the second pressure chamber 1340 is a cylinder block 1310. ) Is connected to a fourth hydraulic flow path 1404 to be described later through a second communication hole 1360b formed in ).

The sealing member is 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, a piston sealing member 1350a, a drive shaft 1390 and a cylinder. It includes a drive shaft sealing member 1350b provided between the blocks 1310 and sealing the opening of the second pressure chamber 1340 and the cylinder block 1310. 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 drive shaft sealing member 1350b. It may not leak and may be delivered to the first hydraulic flow path 1401 and the fourth hydraulic flow path 1404 to be described later.

A motor (not shown) is provided to generate a driving force of the hydraulic piston 1320 by an electric signal output from the electronic control unit ECU. The motor may be provided including a stator and a rotor, and may provide power to generate displacement of the hydraulic piston 1320 by rotating in a forward or reverse direction through this. The rotational angular speed 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 will be omitted.

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

The worm shaft may be integrally formed with the rotation shaft of the motor, and a worm may be formed on an outer circumferential surface to be coupled to mesh with the worm wheel to rotate the worm wheel. The worm wheel is connected to be engaged with the drive shaft 1390 to linearly move the drive shaft 1390, and the drive shaft 1390 is connected to the hydraulic piston 1320, through which the hydraulic piston 1320 is connected to the cylinder block 1310. It can be moved sliding within.

To explain the above operations again, when displacement is detected in the brake pedal 10 by the pedal displacement sensor 11, the detected signal is transmitted to the electronic control unit, and the electronic control unit drives the motor to move the worm shaft in one direction. Rotate with 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 advances within the cylinder block 1310 to generate hydraulic pressure in the first pressure chamber 1330. have.

Conversely, when the pedal effort of the brake pedal 10 is released, the electronic control unit drives the motor to rotate the worm shaft in the opposite direction. Accordingly, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 moves backward in 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 may be implemented by operating in the opposite direction to the above. That is, when displacement is detected by the brake pedal 10 by the pedal displacement sensor 11, the detected signal is transmitted to the electronic control unit, and the electronic control unit 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 via the worm wheel, and the hydraulic piston 1320 connected to the drive shaft 1390 moves backward in the cylinder block 1310 to generate hydraulic pressure in the second pressure chamber 1340. have.

Conversely, when the pedal effort 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. Accordingly, the worm wheel also rotates in the opposite direction, and the hydraulic piston 1320 connected to the drive shaft 1390 moves forward in the cylinder block 1310, thereby generating negative pressure in the second pressure chamber 1340.

In this way, 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 driving the motor. It can be determined by controlling the valves whether to implement braking by doing so or to release braking using negative pressure. A detailed description of this will be described later.

On the other hand, the power conversion unit according to the present 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 the same is understood even when the device is made of various structures and methods. Should be.

The hydraulic pressure supply device 1300 may be hydraulically connected to the reservoir 1100 by the dump control unit 1800. The dump control unit 1800 includes a first dump passage 1810 connecting the second pressure chamber 1340 and the reservoir 1100, and a second dump passage connecting the first pressure chamber 1330 and the reservoir 1100 ( 1820 and a first bypass flow path 1830 rejoined after branching on the first dump flow path 1810 may be included.

A first dump check valve 1811 and a second dump check valve 1821 for controlling the flow of the pressurized medium may be provided in the first dump passage 1810 and the second dump passage 1820, respectively. The first dump check valve 1811 may be provided to allow only the flow of the pressurized medium from the reservoir 1100 to the second pressure chamber 1340 and block the flow of the pressurized medium in the opposite direction, and the second dump check valve 1821 may be provided to allow only the flow of the pressurized medium from the reservoir 1100 to the first pressure chamber 1330 and block the flow of the pressurized medium in the opposite direction.

A first bypass flow path 1830 is connected to the first dump check valve 1811 in parallel to the first dump flow path 1810, and a second pressure chamber 1340 and a reservoir are provided in the first bypass flow path 1830. A first dump valve 1831 for controlling the flow of the pressurized medium between the 1100 may be provided. In other words, the first bypass flow path 1830 may be connected to the first dump flow path 1810 by bypassing the front and rear ends of the first dump check valve 1811, and the first dump valve 1831 has a second pressure. It may be provided as a two-way solenoid valve that controls the flow of the pressurized medium between the chamber 1340 and the reservoir 1100. The first dump valve 1831 may be provided as a normal open type solenoid valve that is open normally and operates to close the valve upon receiving an electrical signal from the electronic control unit.

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 based on the hydraulic pressure information and the pedal displacement information. It is provided to control the valves.

The hydraulic control unit 1400 includes a first hydraulic circuit 1510 for controlling the flow of hydraulic pressure delivered to the first and second wheel cylinders 21 and 22 among the four wheel cylinders 20, and the third and third wheel cylinders. 4 It may be provided with a second hydraulic circuit (1520) for controlling the flow of hydraulic pressure delivered to the wheel cylinders (23, 24), and to control the hydraulic pressure transferred from the hydraulic pressure supply device (1300) to the wheel cylinder (20). Includes flow path and valve.

The first hydraulic flow path 1401 is provided to communicate with the first pressure chamber 1330, and may be provided to be branched into the second hydraulic flow path 1402 and the third hydraulic flow path 1403. In addition, the fourth hydraulic passage 1404 is provided to communicate with the second pressure chamber 1340, and may be provided to branch into the fifth hydraulic passage 1405 and the sixth hydraulic passage 1406.

A first valve 1411 for controlling the flow of the pressurized medium may be provided in the first hydraulic flow path 1401. The first valve 1411 may be provided as a two-way control valve that controls the flow of the pressurized medium delivered along the first hydraulic flow path 1401. The first valve 1411 may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state.

The second hydraulic flow path 1402 and the third hydraulic flow path 1403 are provided to be branched from the first hydraulic flow path 1401, and may be connected to the first hydraulic circuit 1510 and the second hydraulic circuit 1520, respectively. In other words, the second hydraulic flow path 1402 is provided to connect the first hydraulic flow path 1401 and the first hydraulic circuit 1510, and the third hydraulic flow path 1403 is provided with the first hydraulic flow path 1401 and the second hydraulic circuit 1510. It may be provided to connect the hydraulic circuit 1520.

A second valve 1412 for controlling the flow of the pressurized medium may be provided in the second hydraulic flow path 1402. The second valve 1412 may be provided as a two-way control valve that controls the flow of the pressurized medium delivered along the second hydraulic flow path 1402. The second valve 1412 may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state. The second valve 1412 is controlled to open in the normal operation mode of the electronic brake system 1000, but regenerative braking by a generator (not shown) provided in the first wheel cylinder 21 and the second wheel cylinder 22 Upon entering the mode, it can be switched to the closed state. A detailed description of this will be described later with reference to FIG. 7.

The fourth hydraulic flow path 1404 has one end in communication with the second pressure chamber 1340, and the other end may be branched into the fifth hydraulic flow path 1405 and the sixth hydraulic flow path 1406. The fifth hydraulic flow path 1405 can connect the fourth hydraulic flow path 1404 and the first hydraulic flow path 1401, and the sixth hydraulic flow path 1406 includes a fourth hydraulic flow path 1404 and a second hydraulic flow path 1402. ) Can be connected.

A third valve 1413 for controlling the flow of the pressurized medium may be provided in the fifth hydraulic flow path 1405. The third valve 1413 may be provided as a two-way control valve that controls the flow of the pressurized medium delivered along the fifth hydraulic flow path 1405. The third valve 1413 may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state.

A fourth valve 1414 for controlling the flow of the pressurized medium may be provided in the sixth hydraulic flow path 1406. The fourth valve 1414 may be provided as a check valve that allows only the flow of the pressurized medium in a direction discharged from the second pressure chamber 1340 toward the second hydraulic flow path 1402 and blocks the flow of the pressurized medium in the opposite direction. . That is, the fourth valve 1414 allows the hydraulic pressure of the pressurized medium generated in the second pressure chamber 1340 to be transferred to the first hydraulic circuit 1510 or the second hydraulic circuit 1520, while allowing the pressure medium in the opposite direction. It is possible to prevent the flow from leaking to the second pressure chamber 1340 through the sixth hydraulic flow path 1406.

In the hydraulic control unit 1400, the hydraulic pressure formed in the first pressure chamber 1330 according to the advance of the hydraulic piston 1320 by the arrangement of the hydraulic flow paths and valves is the first hydraulic flow path 1401 and the second hydraulic flow path ( It may be transferred to the first hydraulic circuit 1510 through 1402 sequentially, and may be transferred to the second hydraulic circuit 1520 through the first hydraulic channel 1401 and the third hydraulic channel 1403 in sequence. . In addition, the hydraulic pressure formed in the second pressure chamber 1340 as the hydraulic piston 1320 moves backward is sequentially passed through the fourth hydraulic flow path 1404, the sixth hydraulic flow path 1406, and the second hydraulic flow path 1402. 1 can be delivered to the hydraulic circuit 1510, the second hydraulic flow through the fourth hydraulic flow path 1404, the fifth hydraulic flow path 1405, the first hydraulic flow path 1401, and the third hydraulic flow path 1403 in sequence. It may be transmitted to the circuit 1520.

On the contrary, the negative pressure formed in the first pressure chamber 1330 according to the retraction of the hydraulic piston 1320 is the hydraulic pressure of the first hydraulic circuit 1510 and the second hydraulic circuit 1520 or the pressurizing medium of the first pressure chamber 1330 Can be recovered with. Specifically, when the first valve 1411 and the second valve 1412 are opened, the hydraulic pressure of the first hydraulic circuit 1510 is sequentially passed through the second hydraulic flow path 1402 and the first hydraulic flow path 1401. It can be transmitted to the pressure chamber 1330, and the hydraulic pressure of the second hydraulic circuit 1520 is transferred to the first pressure chamber 1330 through the third hydraulic channel 1403 and the first hydraulic channel 1401 in sequence. I can. In addition, the negative pressure formed in the second pressure chamber 1340 according to the advance of the hydraulic piston 1320 is the hydraulic pressure or the pressure medium of the first hydraulic circuit 1510 and the second hydraulic circuit 1520 to the second pressure chamber 1340. Can be recovered with. Specifically, when the second valve 1412 and the third valve 1413 are opened, the hydraulic pressure of the first hydraulic circuit 1510 is the second hydraulic flow path 1402, the first hydraulic flow path 1401, and the fifth hydraulic flow path ( 1405), the fourth hydraulic flow passage 1404 may be sequentially passed to the second pressure chamber 1340, and the hydraulic pressure of the second hydraulic circuit 1520 is the third hydraulic flow passage 1403, the first hydraulic flow passage ( 1401), the fifth hydraulic flow passage 1405, and the fourth hydraulic flow passage 1404 may be sequentially passed to the second pressure chamber 1340. A detailed description of the delivery and supply of hydraulic pressure by the arrangement of these hydraulic flow channels and valves will be described later with reference to FIGS. 2 to 5.

The first hydraulic circuit 1510 of the hydraulic control unit 1400 is 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 second hydraulic circuit 1520 may control the hydraulic pressure of the third and fourth wheel cylinders 23 and 24, which are two other wheel cylinders 20.

The first hydraulic circuit 1510 receives hydraulic pressure through the second hydraulic flow path 1402, and the second hydraulic flow path 1402 is two flow paths connected to the first wheel cylinder 21 and the second wheel cylinder 22. Can be provided by branching into. In addition, the second hydraulic circuit 1520 receives hydraulic pressure from the hydraulic pressure supply device 1300 through the third hydraulic channel 1403, and the third hydraulic channel 1403 includes the third wheel cylinder 23 and the fourth wheel cylinder. It may be provided by branching into two flow paths connected to (24).

The first and second hydraulic circuits 1510 and 1520 are first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b to control the flow and hydraulic pressure of the pressurized medium delivered to the first to fourth wheel cylinders 24. ) Can be provided. The first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b are respectively disposed on the upstream side of the first to fourth wheel cylinders 24 and are open normally, but when an electric signal is received from the electronic control unit, the valve It may be provided with a normal open type solenoid valve that operates to close.

The first and second hydraulic circuits 1510 and 1520 are provided with first to fourth check valves 1513a, 1513b, and 1523a connected in parallel with respect to the first to fourth inlet valves 1511a, 1511b, 1521a, and 1521b. , 1523b). Check valves (1513a, 1513b, 1523a, 1523b) are a bypass connecting the front and rear of the first to fourth inlet valves (1511a, 1511b, 1521a, 1521b) on the first and second hydraulic circuits (1510, 1520) It may be provided in the flow path, and allows only the flow of the pressurized medium from each wheel cylinder 20 to the hydraulic pressure supply device 1300, and the flow of the pressurized medium from the hydraulic pressure supply device 1300 to the wheel cylinder 20 can be blocked. . 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 20, and the first to fourth inlet valves 1511a, 1511b, Even when 1521a and 1521b) do not operate normally, the hydraulic pressure of the pressurized medium applied to the wheel cylinder 20 can be smoothly returned to the hydraulic pressure providing unit.

The first hydraulic circuit 1510 includes first and second outlet valves 1512a and 1512b connected to the reservoir 1100 to improve performance when the first and second wheel cylinders 21 and 22 are brake released. I can. The first and second outlet valves 1512a and 1512b are provided between the first and second wheel cylinders 21 and 22 and the reservoir 1100, respectively, from the first and second wheel cylinders 21 and 22 to the reservoir 1100. Controls the flow of the pressurized medium discharged to ). That is, the first and second outlet valves 1512a and 1512b 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 the ABS dump mode, and the wheel cylinder 20 ) Can be controlled. The first and second outlet valves 1512a and 1512b may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state. .

Meanwhile, in recent years, as the market demand for eco-friendly vehicles increases, hybrid vehicles with improved fuel economy are gaining popularity. Hybrid vehicles take a method of recovering kinetic energy as electric energy while the vehicle is braking, storing it in a battery, and then using a motor as an auxiliary drive source for the vehicle. During operation, energy is recovered by a generator (not shown) or the like. This braking operation is referred to as a regenerative braking mode, and the electronic brake system 1000 according to the present embodiment includes the first wheel cylinder 21 and the second wheel cylinder 22 of the first hydraulic circuit 1510 to implement the regenerative braking mode. ) May be provided with a generator (not shown). The regenerative braking mode through cooperative control of the generators of the first and second wheel cylinders 21 and 22 and the second valve 1412 will be described later with reference to FIG. 7.

The second hydraulic circuit 1520 may include a third outlet valve connected to the reservoir 1100 to improve performance when the third wheel cylinder 23 is brake released. The third outlet valve 1522a is provided between the third wheel cylinder 23 and the reservoir 1100 and controls the flow of the pressurized medium discharged from the wheel cylinder 20 to the reservoir 1100. That is, the third outlet valve 1522a senses the braking pressure of the third wheel cylinder 23 and is selectively opened when decompression braking such as an ABS dump mode is required to control the depressurization of the wheel cylinder 20. The third outlet valve 1522a may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state.

Meanwhile, the fourth wheel cylinder 24 of the second hydraulic circuit 1520 may be connected to a second backup passage 1620 to be described later, and a second cut valve 1621 is provided in the second backup passage 1620. It is possible to control the flow of the pressurized medium between the wheel cylinder 24 and the integrated master cylinder 1200.

The electronic brake system 1000 according to the present embodiment is designed to implement braking by directly supplying the pressurized medium discharged from the integrated master cylinder 1200 to the wheel cylinder 20 when normal operation is impossible due to a device failure. It may include first and second backup passages 1610 and 1620. The mode in which the hydraulic pressure of the integrated master cylinder 1200 is directly transmitted to the wheel cylinder 20 is referred to as an abnormal operation mode, that is, a fallback mode.

The first backup passage 1610 is provided to connect the master chamber 1220a of the integrated master cylinder 1200 and the first hydraulic circuit 1510, and the second backup passage 1620 is the first of the integrated master cylinder 1200. It may be provided to connect the 1 simulation chamber 1230a and the second hydraulic circuit 1520.

Specifically, the first backup passage 1610 has one end connected to the master chamber 1220a, and the other end connected between the first inlet valve 1511a and the first outlet valve 1512a on the first hydraulic circuit 1510. The second backup passage 1620 may have one end connected to the first simulation chamber 1230a, and the other end connected to the downstream side of the fourth inlet valve 1521b on the second hydraulic circuit 1520. In FIG. 1, the first backup passage 1610 is shown to be connected between the first inlet valve 1511a and the first outlet valve 1512a, but the first backup passage 1610 diverges and the first outlet valve ( 1512a) and the second outlet valve 1512b, if connected to at least one of the upstream side will be understood to be the same.

A first cut valve 1611 for controlling the flow of the pressurized medium in both directions is provided in the first backup passage 1610, and a second cut valve 1611 for controlling the flow of the pressurized medium in the second backup passage 1620 ( 1621) can be provided. The first cut valve 1611 and the second cut valve 1621 are provided as normal open type solenoid valves that operate to close when a closing signal is received from the electronic control unit after being opened normally. Can be.

Accordingly, when the first and second cut valves 1611 and 1621 are closed, the pressurized medium of the integrated master cylinder 1200 is prevented from being directly transferred to the wheel cylinder 20, and at the same time, the hydraulic pressure supply device 1300 The hydraulic pressure provided may be supplied to the first and second hydraulic circuits 1510 and 1520 through the hydraulic control unit 1400, and when the first and second cut valves 1611 and 1621 are opened, an integrated master cylinder The pressurized medium pressurized at 1200 may be directly supplied to the first and second hydraulic circuits 1510 and 1520 through the first and second backup passages 1610 and 1620 to implement braking.

The electronic brake system 1000 according to the present embodiment may include a pressure sensor PS that senses the hydraulic pressure of at least one of the first hydraulic circuit 1510 and the second hydraulic circuit 1520. In the drawing, the pressure sensor (PS) is shown to be provided on the side of the second hydraulic circuit 1520, but is not limited to the location and number, if it can detect the hydraulic pressure of the hydraulic circuit and the integrated master cylinder 1200 This includes cases where various numbers are provided in various locations.

Hereinafter, a method of operating the electronic brake system 1000 according to the present embodiment will be described.

The operation of the electronic brake system 1000 according to the present embodiment is a normal operation mode in which various devices and valves operate normally without failure or abnormality, and an abnormal operation mode in which malfunctions or abnormalities occur in various devices and valves. A fallback mode) and a regenerative braking mode using a generator (not shown) provided in the first and second wheel cylinders 21 and 22.

First, a normal operation mode of the operation method of the electronic brake system 1000 according to the present embodiment will be described.

The normal operation mode of the electronic brake system 1000 according to the present embodiment is divided into a first braking mode and a second braking mode as the hydraulic pressure transmitted from the hydraulic pressure supply device 1300 to the wheel cylinder 20 increases. can do. Specifically, the first braking mode primarily provides hydraulic pressure by the hydraulic pressure supply device 1300 to the wheel cylinder 20, and the second braking mode is the hydraulic pressure by the hydraulic pressure supply device 1300 to the wheel cylinder 20 By providing a second braking pressure than the first braking mode can be delivered.

The first braking mode and the second braking mode can be changed by changing the operation of the hydraulic pressure supply device 1300 and the hydraulic control unit 1400. The hydraulic pressure supply device 1300 can provide a sufficiently high hydraulic pressure of a pressurized medium without a high-spec motor by utilizing the first and second braking modes, and further, it is possible to prevent unnecessary loads applied to the motor. Accordingly, while reducing the cost and weight of the brake system, a stable braking force can be secured, and durability and operational reliability of the device can be improved.

2 is a hydraulic circuit diagram showing a state in which the electronic brake system 1000 according to the present embodiment performs a first braking mode.

Referring to FIG. 2, when the driver presses the brake pedal 10 at the beginning of braking, the motor (not shown) operates to rotate in one direction, and the rotational force of the motor is transmitted to the hydraulic pressure providing unit by the power converter, providing hydraulic pressure. As the hydraulic piston 1320 of the unit advances, it generates hydraulic pressure in the first pressure chamber 1330. The hydraulic pressure discharged from the first pressure chamber 1330 is transmitted to each wheel cylinder 20 through the hydraulic control unit 1400, the first hydraulic circuit 1510, and the second hydraulic circuit 1520 to generate braking force. .

Specifically, the hydraulic pressure formed in the first pressure chamber 1330 passes through the first hydraulic flow path 1401 and the second hydraulic flow path 1402 in sequence, and the first and second wheels provided in the first hydraulic circuit 1510 It is transmitted primarily to the cylinders 21 and 22. At this time, the first valve 1411 and the second valve 1412 are converted to an open state to transmit the hydraulic pressure of the pressurized medium formed in the first pressure chamber 1330 to the first hydraulic circuit 1510. In addition, the first inlet valve 1511a and the second inlet valve 1511b provided in the first hydraulic circuit 1510 are kept open, and the first outlet valve 1512a and the second outlet valve 1512b are closed. By maintaining the state, the hydraulic pressure of the pressurized medium is prevented from leaking to the reservoir 1100.

In addition, the hydraulic pressure of the pressurized medium formed in the first pressure chamber 1330 passes through the first hydraulic flow path 1401 and the third hydraulic flow path 1403 in sequence, and the wheel cylinder 20 provided in the second hydraulic circuit 1520 ) Is transmitted first. As described above, since the first valve 1411 is converted to an open state, the hydraulic pressure of the pressurized medium formed in the first pressure chamber 1330 may be transmitted to the second hydraulic circuit 1520. In addition, the third inlet valve 1521a and the fourth inlet valve 1521b provided in the second hydraulic circuit 1520 maintain an open state, and the third outlet valve 1522a is maintained in a closed state to prevent hydraulic pressure of the pressurized medium. Leakage to the reservoir 1100 can be prevented.

In the first braking mode, the second dump check valve 1821 provided in the second dump passage 1820 connected to the first pressure chamber 1330 is pressurized from the reservoir 1100 to the first pressure chamber 1330 While allowing the flow of the medium, it blocks the flow of the pressurized medium from the first pressure chamber 1330 to the reservoir 1100. The pressure formed in the first pressure chamber 1330 by the advance of the hydraulic piston 1320 The fluid pressure of the medium is all delivered to the first hydraulic flow path 1401, so that quick braking can be implemented.

In the first braking mode that implements the braking of the wheel cylinder 20 by the hydraulic pressure supply device 1300, the first cut valve 1611 and the first cut valve 1611 provided in the first backup passage 1610 and the second backup passage 1620, respectively, The second cut valve 1621 is closed and switched to prevent the pressurized medium discharged from the integrated master cylinder 1200 from being transmitted to the wheel cylinder 20.

Specifically, when a pedal effort is applied to the brake pedal 10, the first cut valve 1611 and the second cut valve 1621 are closed, so that the master chamber 1220a is closed. Therefore, as the pedal effort is applied to the brake pedal 10, the pressurized medium accommodated in the master chamber 1220a is pressurized to form a hydraulic pressure, and the hydraulic pressure of the pressurized medium formed in the master chamber 1220a is applied to the first simulation piston 1230 It is transmitted to the direction (the right side based on FIG. 2), and the reservoir valve 1721 is opened in the normal operation mode, and displacement occurs in the first simulation piston 1230. Meanwhile, in the normal operation mode of the electronic brake system 1000, since the simulator valve 1261 is closed, the second simulation chamber 1240a is closed, so that no displacement occurs in the second simulation piston 1240, and accordingly, the first simulation The displacement of the piston 1230 compresses the elastic member 1250, and an elastic restoring force by compression of the elastic member 1250 is provided to the driver as a pedal feel. At this time, the pressurized medium accommodated in the first simulation chamber 1230a is discharged to the reservoir 1100 through the second reservoir flow path 1720.

The electronic brake system 1000 according to the present embodiment may switch from the first braking mode to the second braking mode shown in FIG. 3 when a higher braking pressure than the first braking mode is to be provided.

3 is a hydraulic circuit diagram showing a state in which the electronic brake system 1000 according to the present embodiment performs a second braking mode. Referring to FIG. 4, the electronic control unit is a brake pedal sensed by the pedal displacement sensor 11 ( If the displacement or operating speed of 10) is higher than the preset level or the hydraulic pressure detected by the pressure sensor is higher than the preset level, it is determined that a higher braking pressure is required and the first braking mode is the second braking mode. Can be switched to.

When switching from the first braking mode to the second braking mode, the motor operates to rotate in the other direction, and the rotational force of the motor is transmitted to the hydraulic pressure supply unit by the power conversion unit, and the hydraulic piston 1320 moves backward, thereby causing the second pressure. A hydraulic pressure is generated in the chamber 1340. The hydraulic pressure discharged from the second pressure chamber 1340 is transmitted to each wheel cylinder 20 through the hydraulic control unit 1400, the first hydraulic circuit 1510, and the second hydraulic circuit 1520 to generate braking force. .

Specifically, the hydraulic pressure formed in the second pressure chamber 1340 is sequentially passed through the fourth hydraulic flow path 1404, the sixth hydraulic flow path 1406, and the second hydraulic flow path 1402 to reach the first hydraulic circuit 1510. It is transmitted secondarily to the provided first and second wheel cylinders 21 and 22. At this time, the fourth valve 1414 provided in the sixth hydraulic flow path 1406 allows the flow of the pressurized medium from the fourth hydraulic flow path 1404 to the second hydraulic flow path 1402, and the second pressure chamber The pressurized medium discharged from 1340 may be stably provided to the second hydraulic flow path 1402. In addition, the first inlet valve 1511a and the second inlet valve 1511b provided in the first hydraulic circuit 1510 are kept open, and the first outlet valve 1512a and the second outlet valve 1512b are closed. By maintaining the state, the hydraulic pressure of the pressurized medium is prevented from leaking to the reservoir 1100.

In addition, the hydraulic pressure formed in the second pressure chamber 1340 sequentially passes through the fourth hydraulic flow path 1404, the fifth hydraulic flow path 1405, the first hydraulic flow path 1401, and the third hydraulic flow path 1403. 2 It is transmitted secondary to the third and fourth wheel cylinders 23 and 24 provided in the hydraulic circuit 1520.

At this time, the third valve 1413 provided in the fifth hydraulic flow path 1405 is converted to an open state so that the hydraulic pressure of the pressurized medium formed in the second pressure chamber 1340 can be transferred to the second hydraulic circuit 1520. . In addition, the third inlet valve 1521a and the fourth inlet valve 1521b provided in the second hydraulic circuit 1520 maintain an open state, and the third outlet valve 1522a is maintained in a closed state to prevent hydraulic pressure of the pressurized medium. Leakage to the reservoir 1100 can be prevented.

In the second braking mode, the first valve 1411 provided in the first hydraulic flow path 1401 is converted to a closed state so that the hydraulic pressure of the pressurized medium formed in the second pressure chamber 1340 is transferred to the first pressure chamber 1330. Transmission may be prevented, and the second valve 1412 may maintain an open state to synchronize the hydraulic pressure level of the pressurized medium between the first hydraulic circuit 1510 and the second hydraulic circuit 1520. In addition, in the second braking mode, the first dump valve 1831 provided in the first bypass flow path 1830 is converted to a closed state so that the hydraulic pressure of the pressurized medium formed in the second pressure chamber 1340 is reduced to the first bypass flow path. It is possible to prevent leakage to the reverser through (1830).

The operation of the integrated master cylinder 1200 in the second braking mode is the same as the operation of the integrated master cylinder 1200 in the first braking mode described above, and a description will be omitted to prevent duplication of contents.

Hereinafter, a method of releasing braking in the normal operation mode of the electronic brake system 1000 according to the present embodiment will be described.

4 is a hydraulic circuit diagram showing a state in which the hydraulic piston 1320 of the electronic brake system 1000 according to the present embodiment moves forward and releases the second braking mode.

Referring to FIG. 4, when the pedal effort applied to the brake pedal 10 is released, the motor generates a rotational force in one direction and transmits it to the power conversion unit, and the power conversion unit advances the hydraulic piston 1320. Accordingly, while releasing the hydraulic pressure in the second pressure chamber 1340, negative pressure may be generated, and thus the pressurizing medium of the wheel cylinder 20 may be transmitted to the second pressure chamber 1340.

Specifically, the hydraulic pressure of the pressurized medium applied to the first wheel cylinder 21 and the second wheel cylinder 22 provided in the first hydraulic circuit 1510 is the second hydraulic flow path 1402 and the first hydraulic flow path 1401. , The fifth hydraulic flow passage 1405 and the fourth hydraulic flow passage 1404 are sequentially passed and are recovered to the second pressure chamber 1340. At this time, the second valve 1412 and the third valve 1413 are opened to allow the flow of the pressurized medium on the second hydraulic flow path 1402 and the fifth hydraulic flow path 1405, and to the first hydraulic circuit 1510. The provided first inlet valve 1511a and the second inlet valve 1511b maintain an open state, and the first outlet valve 1512a and the second outlet valve 1512b maintain a closed state.

In addition, the hydraulic pressure of the pressurized medium applied to the third wheel cylinder 23 and the fourth wheel cylinder 24 provided in the second hydraulic circuit 1520 due to the negative pressure generated in the second pressure chamber 1340 is the third hydraulic oil. The furnace 1403, the first hydraulic flow path 1401, the fifth hydraulic flow path 1405, and the fourth hydraulic flow path 1404 are sequentially passed through and are recovered to the second pressure chamber 1340. The third inlet valve 1521a and the fourth inlet valve 1521b provided in the second hydraulic circuit 1520 are maintained in an open state, and the third outlet valve 1522a is maintained in a closed state.

When the second braking mode is released, the first valve 1411 is switched to an open state to facilitate the forward movement of the hydraulic piston 1320, and a first dump valve provided in the first bypass flow path 1830 Since the 1831 is switched to the closed state, negative pressure can be rapidly formed in the second pressure chamber 1340 by the advance of the hydraulic piston 1320.

After completing the release of the second braking mode, it is possible to switch to the release operation of the first braking mode shown in FIG. 5 in order to completely release the braking pressure applied to the wheel cylinder 20.

5 is a hydraulic circuit diagram showing a state in which the hydraulic piston 1320 of the electronic brake system 1000 according to the present embodiment moves backward and releases the first braking mode.

Referring to FIG. 5, when the pedal effort applied to the brake pedal 10 is released, the motor generates rotational force in another direction and transmits it to the power conversion unit, and the power conversion unit moves the hydraulic piston 1320 backward. As a result, negative pressure may be generated in the first pressure chamber 1330, whereby the pressure medium of the wheel cylinder 20 may be transmitted to the first pressure chamber 1330.

Specifically, the hydraulic pressure of the first wheel cylinder 21 and the second wheel cylinder 22 provided in the first hydraulic circuit 1510 sequentially passes through the second hydraulic flow path 1402 and the first hydraulic flow path 1401 Thus, it is recovered to the first pressure chamber 1330. At this time, the first valve 1411 and the second valve 1412 are opened to allow the flow of the pressurized medium in the first hydraulic flow path 1401 and the second hydraulic flow path 1402, and the third valve 1413 is closed. As a result, it is possible to prevent the pressurized medium from being transmitted to the second pressure chamber 1340, thereby achieving rapid and smooth retraction of the hydraulic piston 1320. In addition, the first inlet valve 1511a and the second inlet valve 1511b provided in the first hydraulic circuit 1510 are kept open, and the first outlet valve 1512a and the second outlet valve 1512b are closed. Stay in state.

In addition, the hydraulic pressure of the pressurized medium applied to the third wheel cylinder 23 and the fourth wheel cylinder 24 provided in the second hydraulic circuit 1520 by the negative pressure generated in the first pressure chamber 1330 is the third hydraulic oil. The furnace 1403 and the first hydraulic flow passage 1401 are sequentially passed and are recovered to the first pressure chamber 1330. The third inlet valve 1521a and the fourth inlet valve 1521b provided in the second hydraulic circuit 1520 are maintained in an open state, and the third outlet valve 1522a is maintained in a closed state.

When the first braking mode is released, the second dump valve 3843 provided in the first bypass flow path 1830 is converted to an open state, and thus the second pressure chamber 1340 is moved backward by the hydraulic piston 1320. The received pressurized medium may be discharged to the reservoir 1100, whereby the hydraulic piston 1320 can be moved back quickly and smoothly.

Hereinafter, a case in which the electronic brake system 1000 according to the present embodiment does not operate normally, that is, an operating state of a fall-back mode will be described.

6 is a hydraulic circuit diagram showing an operating state in an abnormal operation mode (fallback mode) when normal operation of the electronic brake system 1000 according to the present embodiment is impossible due to a device failure or the like.

Referring to FIG. 6, in the abnormal operation mode, each of the valves is controlled to a non-operational braking initial state. At this time, when the driver applies a pedal effort to the brake pedal 10, the master piston 1220 connected to the brake pedal 10 advances and displacement occurs. In the non-operating state, since the first cut valve 1611 is provided in an open state, the pressurized medium accommodated in the master chamber 1220a by the advance of the master piston 1220 is subjected to the first hydraulic pressure along the first backup passage 1610. It is transmitted to the first wheel cylinder 21 and the second wheel cylinder 22 of the circuit 1510 to implement braking.

In addition, the pressurized medium accommodated in the master chamber 1220a advances the first simulation piston 1230 to generate displacement, and the second simulation piston 1240 also advances and displaces by the displacement of the first simulation piston 1230. Is generated, the pressurized medium accommodated in the second simulation chamber 1240a flows into the first simulation chamber 1230a along the simulation flow path 1260, and the pressurized medium accommodated in the first simulation chamber 1230a is a second backup flow path ( Braking may be implemented by being transmitted to the third wheel cylinder 23 and the fourth wheel cylinder 24 of the second hydraulic circuit 1520 through 1620 ). At this time, since the simulator valve 1261 is provided in an open state in the non-operating state, the pressurized medium accommodated in the second simulation chamber 1240a can be transferred to the first simulation chamber 1230a, and the second cut valve 1621 ) Is provided in an open state, so the pressurized medium accommodated in the first simulation chamber 1230a may be delivered to the second backup passage 1620.

In the abnormal operation mode, the first to fourth inlet valves 1511a, 1511b, 1521a, 1521b provided in the first and second hydraulic circuits 1510 and 1520 are in an open state, and the reservoir valve 1721 is in a closed state. Since the hydraulic pressure delivered from the master chamber 1220a and the first simulation chamber 1230a of the integrated master cylinder 1200 can be directly transferred to each wheel cylinder 20, braking stability can be improved and quick braking can be achieved.

Hereinafter, a regenerative braking mode of the electronic brake system 1000 according to the present embodiment will be described.

7 is a hydraulic circuit diagram showing a state in which the electronic brake system 1000 according to the first embodiment of the present invention performs a regenerative braking mode.

In the case of the third wheel cylinder 23 and the fourth wheel cylinder 24 of the second hydraulic circuit 1520, the braking force that the driver wants to implement is formed by the hydraulic pressure of the pressurized medium by the operation of the hydraulic pressure supply device 1300 On the other hand, in the case of the first wheel cylinder 21 and the second wheel cylinder 22 of the first hydraulic circuit 1510 in which an energy recovery device such as a generator is installed, the pressurized medium by the hydraulic pressure supply device 1300 is The sum of the total braking pressure added by the braking pressure and the regenerative braking pressure by the generator should be equal to the total braking force of the third wheel cylinder 23 and the fourth wheel cylinder 24. Therefore, when entering the regenerative braking mode, the braking pressure by the hydraulic pressure supply device 1300 applied to the first wheel cylinder 21 and the second wheel cylinder 22 by closing the second valve 1412 is removed or By maintaining and simultaneously increasing the regenerative braking pressure by the generator, the total braking force of the first and second wheel cylinders 21 and 22 may be equal to the braking force of the third and fourth wheel cylinders 23 and 24.

Specifically, referring to FIG. 7, when the driver depresses the brake pedal 10 in the first braking mode, the motor operates to rotate in one direction, and the rotational force of the motor is transmitted to the hydraulic pressure providing unit by the power transmission unit, providing hydraulic pressure. As the hydraulic piston 1320 of the unit advances, it generates hydraulic pressure in the first pressure chamber 1330. The hydraulic pressure discharged from the first pressure chamber 1330 is transmitted to each wheel cylinder 20 through the hydraulic control unit 1400, the first hydraulic circuit 1510, and the second hydraulic circuit 1520 to generate braking force. .

In the case of the second hydraulic circuit 1520 in which an energy recovery device such as a generator is not installed, the hydraulic pressure of the pressurized medium formed in the first pressure chamber 1330 flows through the first hydraulic flow path 1401 and the third hydraulic flow path 1403 in sequence. It passes through and implements the braking of the third and fourth wheel cylinders 23 and 24. As described above, since the first valve 1411 is switched to an open state, the hydraulic pressure of the pressurized medium formed in the first pressure chamber 1330 may be transmitted to the second hydraulic circuit 1520.

On the other hand, in the case of the first hydraulic circuit 1510 in which the generator is installed, the electronic control unit detects the speed and deceleration of the vehicle, and if it is determined that the regenerative braking mode can be entered, the second valve 1412 is closed to It is possible to block the transfer of the hydraulic pressure of the pressurized medium to the first wheel cylinder 21 and the second wheel cylinder 22, and implement regenerative braking by the generator. Thereafter, the electronic control unit determines that the vehicle is in a state unsuitable for regenerative braking, or when it is determined that the braking pressure of the first hydraulic circuit 1510 and the braking pressure of the second hydraulic circuit 1520 are different, the second valve ( 1412) is switched to the open state to control the hydraulic pressure of the pressurized medium to be transmitted to the first hydraulic circuit 1510, and at the same time, the braking pressure of the first hydraulic circuit 1510 and the braking pressure of the second hydraulic circuit 1520 are reduced. Can be synchronized. Accordingly, the braking pressure or braking force applied to the first to fourth wheel cylinders 20 is uniformly controlled to improve the driving stability of the vehicle by preventing oversteering or understeering as well as braking stability of the vehicle. I can make it.

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

FIG. 8 is a hydraulic circuit diagram showing the electronic brake system 2000 according to the second embodiment of the present invention. Referring to FIG. 8, the hydraulic control unit 2400 according to the second embodiment of the present invention is a first hydraulic flow path. A seventh hydraulic flow path 2407 connected in parallel with the first valve 1411 on the 1401, and a fifth valve 2415 provided in the seventh hydraulic flow path 2407 to control the flow of the pressurized medium are further included. It can be prepared.

In the description of the electronic brake system 2000 according to the second embodiment of the present invention described below, the electronic brake system 1000 according to the first embodiment of the present invention described above is described above except for the case where a separate reference numeral is used for additional description. ), the description is omitted to prevent duplication of content.

The seventh hydraulic flow path 2407 can be connected by bypassing the front and rear ends of the first valve 1411 on the first hydraulic flow path 1401, and the fifth valve 2415 is provided in the seventh hydraulic flow path 2407 to pressurize. While controlling the flow of the medium, it may be provided with a check valve that allows only the flow of the pressurized medium discharged from the first pressure chamber 1330 and, on the contrary, blocks the flow of the pressurized medium toward the first pressure chamber 1330. That is, the fifth valve 2415 allows the hydraulic pressure of the pressurized medium generated in the first pressure chamber 1330 to be transferred to the first hydraulic circuit 1510 and the second hydraulic circuit 1520, while allowing the pressure medium in the opposite direction. It is possible to prevent the flow from leaking into the first pressure chamber 1330 through the seventh hydraulic flow path 2407.

Accordingly, in the first braking mode of the electronic brake system 2000 according to the second embodiment of the present invention, the hydraulic pressure of the pressurized medium generated in the first pressure chamber 1330 by the advance of the hydraulic piston 1320 is first The hydraulic flow path 1401 and the second hydraulic flow path 1402 are sequentially passed to the first hydraulic circuit 1510, and at the same time, the first hydraulic flow path 1401, the seventh hydraulic flow path 2407, and the second hydraulic flow path ( It may be additionally provided to the first hydraulic circuit 1510 through 1402 sequentially. In addition, the hydraulic pressure of the pressurized medium generated in the first pressure chamber 1330 is transmitted to the second hydraulic circuit 1520 through the first hydraulic flow path 1401 and the third hydraulic flow path 1403 in sequence, and the first It may be additionally provided to the second hydraulic circuit 1520 through the hydraulic flow path 1401, the seventh hydraulic flow path 2407, and the third hydraulic flow path 1403 in sequence.

In addition, the fifth valve 2415 is provided as a check valve that blocks the flow of the pressurized medium to the first pressure chamber 1330, and the hydraulic pressure of the pressurized medium generated in the second pressure chamber 1340 in the second braking mode It is possible to prevent leakage into the first pressure chamber 1330.

Hereinafter, an electronic brake system 3000 according to a third embodiment of the present invention will be described.

9 is a hydraulic circuit diagram showing the electronic brake system 3000 according to the third embodiment of the present invention. Referring to FIG. 9, the dump control unit 3800 according to the third embodiment of the present invention includes a second dump passage ( A second bypass flow path 3840 that is branched and rejoined on the 1820 and a second dump valve 3840 provided in the second bypass flow path 3840 to control the flow of the pressurized medium may be further included.

In the description of the electronic brake system 3000 according to the third embodiment of the present invention described below, the electronic brake system 1000 according to the first embodiment of the present invention described above is described above, except for the case where a separate reference numeral is used for additional description. ), the description is omitted to prevent duplication of content.

The second bypass flow path 3840 is connected in parallel with the second dump check valve 1821, and the pressure medium flow between the first pressure chamber 1330 and the reservoir 1100 in the second bypass flow path 3840 A second dump valve 3841 for controlling the may be provided. In other words, the second bypass flow path 3840 may be connected to the second dump flow path 1820 by bypassing the front and rear ends of the first dump check valve 1811, and the second dump valve 3840 is a first pressure It may be provided as a two-way solenoid valve that controls the flow of the pressurized medium between the chamber 1330 and the reservoir 1100. The second dump valve 3841 may be provided as a normally closed type solenoid valve that operates to open the valve when it receives an electrical signal from the electronic control unit after being in a normally closed state.

In the first braking mode, the second dump valve 3843 maintains a closed state, so that the hydraulic pressure of the pressurized medium generated in the first pressure chamber 1330 by the advance of the hydraulic piston 1320 is the first hydraulic flow path 1401 Can be delivered to. In the second braking mode, the second dump valve 3843 is switched to an open state, so that the pressurizing medium may be supplied from the reservoir 1100 to the first pressure chamber 1330 when the hydraulic piston 1320 moves backward.

On the other hand, when the second braking mode is released, the second dump valve 3838 is converted to an open state, thereby discharging the pressurized medium contained in the first pressure chamber 1330 to the reservoir 1100 to move the hydraulic piston 1320 forward. Can plan smoothly. When the first braking mode is released, the second dump valve 3843 is converted to a closed state, so that a negative pressure is stably formed in the first pressure chamber 1330 by the reverse of the hydraulic piston 1320, and the pressurized medium is the first. It can be quickly recovered to the pressure chamber 1330.

1000, 2000, 3000: electronic brake system
1100: reservoir 1200: integrated master cylinder
1220: master piston 1220a: master chamber
1230: first simulation piston 1230a: first simulation chamber
1240: second simulation piston 1240a: second simulation chamber
1250: elastic member 1260: simulation flow path
1261: simulator valve 1300: hydraulic supply
1320: hydraulic piston 1330: first pressure chamber
1340: second pressure chamber 1400, 2400: hydraulic control unit
1401: first hydraulic flow path 1402: second hydraulic flow path
1403: third hydraulic flow path 1404: fourth hydraulic flow path
1405: 5th hydraulic flow 1406: 6th hydraulic flow
2407: seventh hydraulic flow path 1411: first valve
1412: second valve 1413: third valve
1414: fourth valve 2415: fifth valve
1510: first hydraulic circuit 1520: second hydraulic circuit
1610: first backup flow path 1611: first cut valve
1620: second backup flow path 1621: second cut valve
1710: first reservoir euro 1720: second reservoir euro
1721: reservoir valve 1800, 3800: dump control unit
1810: first dump passage 1811: first dump check valve
1820: second dump passage 1821: second dump check valve
1830: first bypass flow path 1831: first dump valve
3840: second bypass flow path 3841: second dump valve

Claims (21)

A reservoir in which the pressurized medium is stored;
An integrated master cylinder having a master chamber and a simulation chamber;
A reservoir flow path for communicating the integrated master cylinder and the reservoir;
A first pressure provided on one side of the hydraulic piston that is movably accommodated in the cylinder block by operating a hydraulic piston by an electrical signal output in response to the displacement of the brake pedal and connected to one or more wheel cylinders A hydraulic pressure supply device including a chamber and a second pressure chamber provided on the other side of the hydraulic piston and connected to one or more wheel cylinders;
A hydraulic control unit having a first hydraulic circuit for controlling hydraulic pressure transmitted to two wheel cylinders and a second hydraulic circuit for controlling hydraulic pressure transmitted to two other wheel cylinders; And
Including; an electronic control unit for controlling valves based on hydraulic pressure information and displacement information of the brake pedal,
The hydraulic control unit
A first hydraulic flow path in communication with the first pressure chamber, second and third hydraulic flow paths branched from the first hydraulic flow path and connected to the first and second hydraulic circuits, respectively, and in communication with the second pressure chamber A fourth hydraulic flow path that is branched from the fourth hydraulic flow path and connected to the first hydraulic flow path, and a sixth hydraulic flow path that is branched from the fourth hydraulic flow path and connected to the second hydraulic flow path. Electronic brake system including. The method of claim 1,
The hydraulic control unit
A first valve provided in the first hydraulic passage to control the flow of the pressurized medium, a second valve provided in the second hydraulic passage to control the flow of the pressurized medium, and a flow of the pressurized medium provided in the fifth hydraulic passage An electronic brake system including a third valve to control and a fourth valve provided in the sixth hydraulic flow path to control the flow of the pressurized medium. The method of claim 2,
The first to third valves
It is provided with a solenoid valve that controls the flow of the pressurized medium in both directions,
The fourth valve is
An electronic brake system provided with a check valve that allows only the flow of the pressurized medium from the fourth hydraulic flow path to the second hydraulic flow path. The method of claim 3,
The simulation chamber is
A first simulation chamber and a second simulation chamber,
The integrated master cylinder
A master piston provided in the master chamber and provided to be displaceable by a brake pedal, and a master piston provided in the first simulation chamber and provided to be displaceable by the displacement of the master piston or the hydraulic pressure of the pressurized medium accommodated in the master chamber. 1 simulation piston, a second simulation piston provided in the second simulation chamber and capable of being displaced by the displacement of the first simulation piston or the hydraulic pressure of the first simulation chamber, the first simulation piston and the second An elastic member provided between the simulation pistons, a simulation flow path connecting the first simulation chamber and the second simulation chamber, a simulator valve provided in the simulation flow path to control the flow of the pressurized medium, and the second simulation piston. Electronic brake system with resilient support simulator spring. The method of claim 4,
A first backup passage connecting the master chamber and the first hydraulic circuit;
A second backup passage connecting the first simulation chamber and the second hydraulic circuit;
A first cut valve provided in the first backup passage to control the flow of the pressurized medium; And
The electronic brake system further comprising a; second cut valve provided in the second backup passage to control the flow of the pressurized medium. The method of claim 5,
The reservoir flow path is
An electronic brake system comprising: a first reservoir passage connecting the reservoir and the master chamber, and a second reservoir passage connecting the reservoir and the first simulation chamber. The method of claim 6,
Electronic brake system further comprising a; reservoir valve provided in the second reservoir flow path to control the flow of the pressurized medium. The method of claim 7,
The first hydraulic circuit is
First inlet valve and second inlet valve respectively controlling the flow of the pressurized medium supplied to the first wheel cylinder and the second wheel cylinder, and the flow of the pressurized medium discharged from the first wheel cylinder and the second wheel cylinder to the reservoir Including a first outlet valve and a second outlet valve each controlling,
The second hydraulic circuit is
A third inlet valve and a fourth inlet valve respectively controlling the flow of the pressurized medium supplied to the third wheel cylinder and the fourth wheel cylinder, and a third controlling the flow of the pressurized medium discharged from the third wheel cylinder to the reservoir. Including an outlet valve,
The second backup flow path
An electronic brake system provided to connect the first simulation chamber and the downstream side of the fourth inlet valve. The method of claim 8,
The electronic brake system further comprising a generator provided on each of the first wheel cylinder and the second wheel cylinder. The method of claim 9,
A dump control unit provided between the reservoir and the hydraulic pressure supply device to control the flow of the pressurized medium; further comprising,
The dump control unit
A first dump passage connecting the second pressure chamber and the reservoir, a second dump passage connecting the first pressure chamber and the reservoir, and provided in the first dump passage from the reservoir to the second pressure chamber A first dump check valve that allows only the flow of the pressurized medium toward, a second dump check valve provided in the second dump passage and allows only the flow of the pressurized medium from the reservoir to the first pressure chamber, and the first dump An electronic brake system comprising a first bypass flow path connected in parallel with the first dump check valve on a flow path, and a first dump valve provided in the first bypass flow path to control flow of the pressurized medium in both directions. The method of claim 3,
The hydraulic control unit
An electronic brake system further comprising a seventh hydraulic flow path connected in parallel with the first valve on the first hydraulic flow path, and a fifth valve provided in the seventh hydraulic flow path to control the flow of the pressurized medium. The method of claim 11,
The fifth valve is
An electronic brake system provided with a check valve that allows only the flow of the pressurized medium discharged from the first pressure chamber. The method of claim 10,
The dump control unit
Further comprising a second bypass flow path connected in parallel to the second dump check valve on the second dump flow path, and a second dump valve provided in the second bypass flow path to control the flow of the pressurized medium in both directions. Electronic brake system. In the method of operating the electronic brake system according to claim 7,
In normal operation mode,
The first cut valve is closed to seal the master chamber, the simulator valve is closed to seal the second simulation chamber, and the second cut valve is closed, but the reservoir valve is opened to open the first simulation chamber and By communicating the reservoir, the first simulation piston compresses the elastic member by the operation of the brake pedal, and the elastic restoring force of the elastic member is provided to the driver as a pedal feel. The method of claim 14,
The normal operation mode is
As the hydraulic pressure of the pressurized medium transmitted from the hydraulic pressure supply device to the wheel cylinder gradually increases, an electronic type including a first braking mode providing hydraulic pressure primarily and a second braking mode providing hydraulic pressure secondarily. How the brake system works. The method of claim 15,
The first braking mode is
The first valve and the second valve are opened, but the third valve is closed,
The hydraulic pressure formed in the first pressure chamber by the advance of the hydraulic piston is provided to the first hydraulic circuit through the first hydraulic channel and the second hydraulic channel in sequence, and the first hydraulic channel and the third hydraulic oil A method of operating an electronic brake system provided to the second hydraulic circuit through a furnace sequentially. The method of claim 16,
The second braking mode is
The second valve and the third valve are opened, but the first valve is closed,
After the first braking mode, the hydraulic pressure formed in the second pressure chamber by the backward movement of the hydraulic piston is provided to the first hydraulic circuit through the fourth hydraulic channel, the sixth hydraulic channel, and the second hydraulic channel in sequence. And the fourth hydraulic flow path, the fifth hydraulic flow path, the first hydraulic flow path, and the third hydraulic flow path sequentially to be provided to the second hydraulic circuit. The method of claim 16,
Release of the first braking mode
The first valve and the second valve are opened, but the third valve is closed,
A negative pressure is generated in the first pressure chamber by the reversing of the hydraulic piston, and the pressurizing medium provided to the first hydraulic circuit is recovered to the first pressure chamber through the second hydraulic channel and the first hydraulic channel in sequence. And the pressurizing medium provided in the second hydraulic circuit is sequentially returned to the first pressure chamber through the third hydraulic flow path and the first hydraulic flow path. The method of claim 17,
Release of the second braking mode
The second valve and the third valve are opened, but the first valve is closed,
By advancing the hydraulic piston, negative pressure is generated in the second pressure chamber, and the pressurizing medium provided to the first hydraulic circuit includes the second hydraulic flow path, the first hydraulic flow path, the fifth hydraulic flow path, and the fourth hydraulic oil. The pressure medium provided in the second hydraulic circuit is sequentially returned to the second pressure chamber through the paths, and sequentially connects the third hydraulic path, the first hydraulic path, the fifth hydraulic path, and the fourth hydraulic path. The method of operating an electronic brake system that is recovered to the second pressure chamber after passing through. The method of claim 14,
In abnormal operation mode,
The first cut valve is opened to communicate with the master chamber and the first hydraulic circuit, the reservoir valve is closed, but the second cut valve is opened to communicate the first simulation chamber and the second hydraulic circuit, The simulator valve is opened to communicate the first simulation chamber and the second simulation chamber,
According to the pedal effort of the brake pedal, the pressurizing medium of the master chamber is provided to the first hydraulic circuit through the first backup passage, and the pressurizing medium of the first simulation chamber and the second simulation chamber is the second backup passage Method of operating an electronic brake system provided to the second hydraulic circuit through the. In the method of operating the electronic brake system according to claim 9,
In the regenerative braking mode by the generator,
Opening the first valve but closing the second valve,
The hydraulic pressure formed in the first pressure chamber by the advance of the hydraulic piston is provided to the second hydraulic circuit through the first hydraulic channel and the third hydraulic channel in sequence, and the first wheel cylinder and the second wheel How to operate an electronic brake system that blocks the supply of hydraulic pressure to the cylinder.

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