KR20210120326A - Electric brake system - Google Patents

Abstract

An electronic brake system comprises: a main device for providing a first hydraulic pressure to a plurality of wheel cylinders, respectively installed on a plurality of wheels based on a position of a brake pedal; and an auxiliary device for providing a second hydraulic pressure to first and second wheel cylinders, respectively installed on first and second wheels among the wheels based on the position of the brake pedal in a state in which the main device cannot generate the first hydraulic pressure. The auxiliary device can receive power from a power network different from that of the main device, and the auxiliary device can control at least one of first and second parking brakes respectively installed on third and fourth wheels among the wheels. In the electronic brake system, when the main device fails or is out of control, the auxiliary device can assist in generating hydraulic pressure required for braking and generate braking force using the parking brake.

Description

Electronic brake system {ELECTRIC BRAKE SYSTEM}

The disclosed invention relates to a brake system, and more particularly, to a brake system that generates a braking force using an electrical signal corresponding to a displacement of a brake pedal.

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

In a conventional brake system, when a driver presses a brake pedal, hydraulic pressure (pressure of brake oil) required for braking is provided to wheel cylinders using a mechanically connected booster. However, as the market demand to implement various braking functions in detail in response to the operating environment of the vehicle increases, recently, when the driver steps on the brake pedal, the driver's braking intention BACKGROUND ART An electronic brake system including a hydraulic pressure supply unit for supplying hydraulic pressure required for braking to wheel cylinders by receiving an electric signal is widely used.

However, in the case of an autonomous vehicle in which the driver is not directly involved in driving of the vehicle, which is being developed recently, the driver does not operate the brake pedal. Therefore, when the electronic brake system fails or is out of control, there is a need for an auxiliary device capable of auxiliaryly generating hydraulic pressure required for braking.

For the above reasons, one aspect of the disclosed invention is to provide an electronic brake system including an auxiliary device capable of auxiliary generation of hydraulic pressure required for braking when the main device fails or is out of control.

SUMMARY One aspect of the disclosed invention is to provide an electronic brake system including an auxiliary device capable of generating braking force using a parking brake when a main device fails or is out of control.

An electronic brake system according to an aspect of the disclosed invention includes: a main device for providing a first hydraulic pressure to a plurality of wheel cylinders respectively installed on a plurality of wheels, based on a position of a brake pedal; and a second hydraulic pressure applied to first and second wheel cylinders respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal in a state in which the main device cannot generate the first hydraulic pressure It may include an auxiliary device that provides The auxiliary device may receive power from a different power network than the main device. The auxiliary device may control at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels.

An electronic brake system according to an aspect of the disclosed invention includes: a hydraulic pressure generating unit that generates a first hydraulic pressure; a hydraulic pressure control unit guiding the first hydraulic pressure to a plurality of wheel cylinders respectively installed on the plurality of wheels; a first control unit controlling the hydraulic pressure generating unit to generate the first hydraulic pressure based on a position of the brake pedal and controlling the hydraulic pressure controlling unit to guide the first hydraulic pressure to the plurality of wheel cylinders; a pump unit generating a second hydraulic pressure; a second control unit for controlling the pump unit to provide the second hydraulic pressure to first and second wheel cylinders respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal have. The pump unit and the second control unit may receive power from a different power network than the hydraulic pressure generating unit, the hydraulic pressure control unit, and the first control unit. The second controller may control at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels.

According to an aspect of the disclosed invention, the control method of an electronic brake system including a main device for generating a first hydraulic pressure and an auxiliary device for generating a second hydraulic pressure by receiving power from a different power network from the main device, the main device providing, by the apparatus, the first hydraulic pressure to a plurality of wheel cylinders respectively installed on the plurality of wheels, based on the position of the brake pedal; First and second wheels respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal in a state in which the main device cannot generate the first hydraulic pressure by the auxiliary device providing the second hydraulic pressure to a cylinder; and controlling, by the auxiliary device, at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels in response to a driver's parking command.

According to an aspect of the disclosed invention, it is possible to provide an electronic brake system including an auxiliary device capable of auxiliaryly generating hydraulic pressure required for braking when the main device is out of control or in an out-of-control state.

According to an aspect of the disclosed invention, it is possible to provide an electronic brake system including an auxiliary device capable of generating braking force using a parking brake when the main device is in a malfunction or out of control state.

According to one aspect of the disclosed invention, an electronic brake system for improving the reliability of braking using a main device for generating hydraulic pressure for braking, an auxiliary device for generating hydraulic pressure auxiliary, and a parking brake for mechanically stopping the wheel can provide

According to one aspect of the disclosed invention, by controlling the parking brake by the auxiliary device, it is possible to provide an electronic brake system capable of providing braking force in a state in which hydraulic pressure generation of the main device is impossible (failure or uncontrollable state).

According to an aspect of the disclosed invention, by controlling the parking brake of the main device and the auxiliary device together, it is possible to provide an electronic brake system capable of providing braking force in a state in which hydraulic pressure generation of the main device is impossible (failure or uncontrollable state). can

1 shows a hydraulic structure of an electronic brake system according to an embodiment.
2 illustrates a hydraulic structure of a main hydraulic device included in an electromagnetic brake according to an exemplary embodiment.
3 illustrates a hydraulic structure of an auxiliary hydraulic device included in the electronic brake according to an embodiment.
4 shows hydraulic and electrical control of an electronic brake system according to an embodiment.
5 illustrates an electrical configuration of a main device and an auxiliary device included in the electronic brake system according to an embodiment.
6 shows hydraulic and electrical control of an electronic brake system according to an embodiment.
7 illustrates an electrical configuration of a main device and an auxiliary device included in the electronic brake system according to an exemplary embodiment.
8 shows hydraulic and electrical control of an electronic brake system according to an embodiment.
9 illustrates electrical configurations of a main device and an auxiliary device included in the electronic brake system according to an exemplary embodiment.

Hereinafter, the working principle and embodiments of the disclosed invention will be described with reference to the accompanying drawings.

1 shows a hydraulic structure of an electronic brake system according to an embodiment.

As shown in FIG. 1 , each of the wheels 11 , 12 , 13 and 14 is provided with a brake disc rotating together with each of the wheels 11 , 12 , 13 and 14 , and the wheels 11 , 12 , 13 and 14 are provided. Brake calipers 21 , 22 , 23 , 24 for stopping the rotation of ) are provided. Each of the brake calipers 21 , 22 , 23 , and 24 may include, for example, a pair of brake pads provided on both sides of the brake disc to press the brake disc.

The brake calipers 21 , 22 , 23 , 24 include wheel cylinders 31 , 32 , 33 , 34 which receive hydraulic pressure and cause a pair of brake pads to press against the brake disc. For example, the wheel cylinders 31 , 32 , 33 , and 34 may include a first wheel cylinder 31 installed on the first brake caliper 21 and a second wheel cylinder installed on the second brake caliper 22 . 32 and a third wheel cylinder 33 installed on the third brake caliper 23 and a fourth wheel cylinder 34 installed on the fourth brake caliper 24 may be included.

The electronic brake system 10 includes a main device 100 for generating hydraulic pressure for braking of a vehicle and an auxiliary device for generating hydraulic pressure when the main device 100 is unable to generate hydraulic pressure (failure or inability to control). device 200 .

The main device 100 may generate hydraulic pressure for generating a braking force in the wheels 11 , 12 , 13 , and 14 . The main device 100 may detect the driver's will to brake through, for example, the brake pedal 50 . The main device 100 generates hydraulic pressure based on the moving distance and/or moving speed of the brake pedal 50 , and transmits the generated hydraulic pressure to the wheel cylinders 31 through the transmission passages 61 , 62 , 63 , 64 . , 32, 33, 34). The transmission passages 61 , 62 , 63 and 64 include a first transmission passage 61 connected to the first wheel cylinder 31 , a second transmission passage 62 connected to the second wheel cylinder 32 , It includes a third transmission passage 63 connected to the three wheel cylinder 33 and a fourth transmission passage 64 connected to the fourth wheel cylinder 34 .

The internal pressure of the wheel cylinders 31 , 32 , 33 , 34 may depend on the hydraulic pressure provided from the main device 100 . A braking force may be generated in the wheels 11 , 12 , 13 , 14 depending on the internal pressure of the wheel cylinders 31 , 32 , 33 , 34 .

The auxiliary device 200 may be provided on the first and second transmission passages 61 and 62 between the main device 100 and the first and second wheel cylinders 31 and 32 . The auxiliary device 200 may pass hydraulic pressure provided to the wheel cylinders 31 , 32 from the main device 100 , or may provide hydraulic pressure to the wheel cylinders 31 , 32 .

The auxiliary device 200 may be activated in a state in which hydraulic pressure generation of the main device 100 is impossible.

The auxiliary device 200 may provide hydraulic pressure to at least some of the wheel cylinders 31 , 32 , 33 , 34 . For example, the auxiliary device 200 may provide hydraulic pressure to the first wheel cylinder 31 of the first brake caliper 21 and the second wheel cylinder 32 of the second brake caliper 22 .

The auxiliary device 200 may receive power from a different power network than the main device 100 . For example, the auxiliary device 200 may receive power from a different power source than that of the main device 100 . 1 , the main device 100 receives power from a first battery B1, and the auxiliary device 200 receives power from a second battery B2 different from the first battery B1. can As another example, the auxiliary device 200 may receive power through a different power line than the main device 100 . The main device 100 may receive power from the first battery B1 through the first power line, and the auxiliary device 200 may receive power from the first battery B1 through the second power line. have.

At least some of the brake calipers 21 , 22 , 23 and 24 may be provided with parking brakes 41 and 42 . For example, among the brake calipers 21 , 22 , 23 and 24 , the parking brakes 41 and 42 are provided to the third and fourth brake calipers 23 and 24 that do not receive hydraulic pressure from the auxiliary device 200 . can be provided. The first parking brake 41 may be provided on the third brake caliper 23 , and the second parking brake 42 may be provided on the fourth brake caliper 24 .

Each of the first and second parking brakes 41 and 42 may be provided with a configuration capable of moving the brake pad by electro-mechanical force without hydraulic pressure. For example, each of the first and second parking brakes 41 and 42 may include a motor having a rotation shaft and a spindle reciprocating by rotation of the rotation shaft. The spindle may reciprocate the brake pad by rotation of the rotating shaft.

Each of the first and second parking brakes 41 and 42 may press the brake pad toward the brake disc in response to the engagement signal. Also, each of the first and second parking brakes 41 , 42 may separate the brake pad from the brake disc in response to the release signal.

As described above, the main device 100 may provide hydraulic pressure for braking to the wheel cylinders 31 , 32 , 33 , and 34 . The auxiliary device 200 includes the first and second wheel cylinders 31 installed on the first and second wheels 11 and 12 in a state in which the hydraulic pressure generation of the main device 100 is impossible (failure or uncontrollable). , 32) can provide hydraulic pressure.

2 illustrates a hydraulic structure of a main hydraulic device included in an electromagnetic brake according to an exemplary embodiment. 3 illustrates a hydraulic structure of an auxiliary hydraulic device included in the electronic brake according to an embodiment.

The main device 100 may include a main hydraulic device 100a that provides hydraulic pressure to the wheel cylinders 31 , 32 , 33 , and 34 through the transmission passages 61 , 62 , 63 , and 64 . The auxiliary device 200 may be provided on at least some of the delivery passages 61 , 62 , 63 and 64 , and auxiliary to provide hydraulic pressure to at least some of the wheel cylinders 31 , 32 , 33 and 34 . It may include an auxiliary hydraulic device 200a.

Referring to FIG. 2 , the main hydraulic device 100a compresses and discharges a reservoir 110 in which a pressurized medium such as brake oil is stored, and a pressurized medium such as brake oil accommodated inside according to the pedal effort of the brake pedal 50 . The master cylinder 120 to perform the operation, the simulation device 130 for providing a reaction force according to the pedal effort of the brake pedal 50 to the driver, and the pedal displacement sensor 51 for detecting the displacement of the brake pedal 50 A hydraulic pressure supply unit 140 for generating hydraulic pressure of a pressurized medium through mechanical operation by receiving a braking will as an electrical signal, a hydraulic pressure control unit 150 for controlling the hydraulic pressure provided from the hydraulic pressure supply unit 140, and pressurization Hydraulic circuits 160 and 170 connected to wheel cylinders 31 , 32 , 33 , 34 for braking the wheels 11 , 12 , 13 and 14 through which the hydraulic pressure of the medium is transmitted, and the hydraulic pressure supply unit 140 . and a dump control unit 180 provided between the reservoir 110 and controlling the flow of the pressurized medium, and a backup flow path that hydraulically connects the master cylinder 120/reservoir 110 and the hydraulic circuits 160 and 170 ( 191 , 192 , and reservoir flow paths 115 and 116 hydraulically connecting the reservoir 110 and the master cylinder 120 .

The pedal displacement sensor 51 may detect a moving distance and/or moving speed at which the pedal 10 moves according to the driver's will to brake, and an electrical output signal (displacement signal) dependent on the detected moving distance and/or moving speed. can be printed out.

The reservoir 110 may accommodate and store the pressurized medium therein, and may be connected to each component element to supply or receive the pressurized medium. The reservoir 110 may be hydraulically connected to the master cylinder 110 by the reservoir flow paths 115 and 116 .

The master cylinder 120 is configured to include at least one hydraulic chamber, and may compress and discharge the pressurized medium inside. The master cylinder 120 includes a first master chamber 121a and a second master chamber 122a, and the master chambers 121a and 122a include a first master piston 121 and a second master piston 122. will be prepared

The first master chamber 121a may be formed on the inlet side (the right side of FIG. 3 ) of the cylinder block 129 to which the brake pedal 50 is connected, and the first master piston 121a has the first master chamber 121a. 121 may be accommodated reciprocally. The first master chamber 121a is connected to the reservoir 110 through the first reservoir flow path 115 . The first master chamber 121a is connected to the first hydraulic circuit 160 through the first backup flow path 191 . The first master piston 121 is provided to be accommodated in the first master chamber 121a, compressing the pressurized medium accommodated in the first master chamber 121a by moving forward, or moving backward in the interior of the first master chamber 121a. It can create negative pressure.

The second master chamber 122a may be formed inside the first master chamber 121a on the cylinder block 129 (on the left side with reference to FIG. 3 ), and the second master piston ( 122) may be accommodated reciprocally. The second master chamber 122a is connected to the reservoir 110 through the second reservoir passage 116 , and the second master chamber 122a is connected to the simulation device 130 through the simulation passage 131 . The second master piston 122 is provided to be accommodated in the second master chamber 122a, compressing the pressurized medium accommodated in the second master chamber 122a by advancing, or moving backward in the interior of the second master chamber 122a. It can create negative pressure.

The simulation device 130 may provide a reaction force to the pedal force for the driver's operation of the brake pedal 50 . The simulation device 130 may provide a pedal feeling to the driver by providing a reaction force from the simulation device 130 in response to the pedal force applied by the driver to the brake pedal 50 .

The simulation apparatus 130 includes a simulation flow path 131 connected to the second master chamber 122a and a pedal simulator 132 provided in the simulation flow path 131 .

The hydraulic pressure supply unit 140 may implement reciprocating movement of the hydraulic piston 142 in response to the driver's will to brake, and may generate hydraulic pressure of the pressurized medium through the reciprocating movement of the hydraulic piston 142 .

The hydraulic pressure supply unit 140 includes a cylinder block 141 provided to receive a pressurized medium, a hydraulic piston 142 accommodated in the cylinder block 141, and a pressure chamber 143 partitioned by the hydraulic piston 142, 144).

The pressure chambers 143 and 144 include a first pressure chamber 143 positioned in front of the hydraulic piston 142 (a left side of the hydraulic piston 142 with reference to FIG. 3 ), and a rear ( FIG. 3 ) of the hydraulic piston 142 . It may include a second pressure chamber 144 located on the right side of the hydraulic piston 142 with reference to 3 .

The first pressure chamber 143 is partitioned by the cylinder block 141 and the front surface of the hydraulic piston 142 so that the volume thereof varies according to the movement of the hydraulic piston 142 . In addition, the second pressure chamber 144 is partitioned by the cylinder block 141 and the rear surface of the hydraulic piston 142 so that the volume varies according to the movement of the hydraulic piston 142 .

The first pressure chamber 143 may be hydraulically connected to a hydraulic pressure control unit 150 to be described later through a hydraulic flow passage. In addition, the second pressure chamber 144 may be hydraulically connected to the hydraulic pressure control unit 150 through a hydraulic pressure passage.

The hydraulic pressure supply unit 140 also includes a first motor 146 that generates a rotational force, and a power conversion unit 147 that converts the rotational force of the first motor 146 into translational movement of the hydraulic piston 142 .

The hydraulic pressure control unit 150 is provided between the hydraulic pressure supply unit 140 and the wheel cylinders 31 , 32 , 33 , 34 , and applies the hydraulic pressure generated by the hydraulic pressure supply unit 140 to the wheel cylinders 31 , 32 , 33, 34). For example, the hydraulic pressure control unit 150 may guide the hydraulic pressure generated in the first pressure chamber 143 to the wheel cylinders 31 , 32 , 33 , 34 while the hydraulic piston 142 advances and , while the hydraulic piston 142 moves backward, the hydraulic pressure generated in the second pressure chamber 144 may be guided to the wheel cylinders 31 , 32 , 33 , and 34 .

The hydraulic pressure control unit 150 is branched into a first hydraulic circuit 160 and a second hydraulic circuit 170 . The hydraulic pressure control unit 150 includes a plurality of hydraulic pressure passages and solenoid valves between the hydraulic pressure supply unit 140 and the first and second hydraulic circuits 160 and 170 to control the hydraulic pressure transmitted from the hydraulic pressure supply unit 140 . can be controlled

The first hydraulic circuit 160 may control the flow of hydraulic pressure transmitted to the first and second wheel cylinders 31 and 32 . The first hydraulic circuit 160 guides the hydraulic pressure generated by the master cylinder 120 or the hydraulic pressure supply unit 140 to the first and second wheel cylinders 31 and 32, and also the first and second wheel cylinders. The pressurized medium at ( 31 , 32 ) can be discharged to the reservoir ( 110 ).

The second hydraulic circuit 170 may control the flow of hydraulic pressure transmitted to the third and fourth wheel cylinders 33 and 34 . The second hydraulic circuit 170 guides the hydraulic pressure generated by the master cylinder 120 or the hydraulic pressure supply unit 140 to the third and fourth wheel cylinders 33 and 34, and also the third and fourth wheel cylinders. The pressurized medium at (33, 34) can be discharged to the reservoir (110).

The first and second hydraulic circuits 160 , 170 are first and second for controlling the flow of pressurized medium towards the first, second, third and fourth wheel cylinders 31 , 32 , 33 and 34 respectively. , The third and fourth inlet valves (161a, 161b, 171a, 171b) and the first, second, third and fourth inlet valves (161a, 161b, 171a, 171b) provided in parallel with respect to the first provided , the second, third and fourth check valves 163a, 163b, 173a, 173b, and the first, second, third and fourth wheel cylinders 21, 22, 23, 24 when braking is released. It includes first, second, third and fourth outlet valves 162a, 162b, 172a, 172b for controlling the flow of the pressurized medium discharged to the reservoir 110 for the purpose. The first, second, third, and fourth inlet valves 161a, 161b, 171a, and 171b may be implemented as normally open valves. The first, second, third, and fourth outlet valves 162a, 162b, 172a, and 172b may be implemented as normally closed valves.

The dump control unit 180 is provided between the hydraulic pressure supply unit 140 and the reservoir 110 , and can control the supply of the pressurized medium from the reservoir 110 to the first and second pressure chambers 143 and 144 . have. For example, while the hydraulic piston 142 is moving forward, the dump control unit 180 blocks the outflow of the pressurized medium from the first pressure chamber 143 to the reservoir 110 and from the reservoir 110 to the second pressure chamber. Supply of pressurized medium to 144 may be allowed. Also, while the hydraulic piston 142 is moving backward, the dump control unit 180 blocks the outflow of the pressurized medium from the second pressure chamber 144 to the reservoir 110 and from the reservoir 110 to the first pressure chamber 143 . ) to allow the supply of pressurized medium.

The main hydraulic device 100a has first and second backup flow paths 191 that can implement braking by directly supplying the pressurized medium discharged from the master cylinder 120 to the wheel cylinders when normal operation is impossible due to a failure of the device. , 192) may be included. A mode in which the hydraulic pressure of the master cylinder 120 is directly transmitted to the wheel cylinder is referred to as a first fallback mode.

The first backup flow path 191 connects the first master chamber 111a of the master cylinder 120 to the first hydraulic circuit 160 , and the second backup flow path 192 connects the reservoir 110 to the second hydraulic circuit. Connect to (170). A first cut valve 195 for controlling the bidirectional flow of the pressurized medium is provided in the first backup flow path 191 , and a second cut valve 195 for controlling the bidirectional flow of the pressurized medium is provided in the second backup flow path 192 ( 196) can be provided. The first cut valve 195 and the second cut valve 196 may be implemented as normally open solenoid valves.

When the first and second cut valves 195 , 196 are closed, the pressurized medium of the master cylinder 120 is prevented from being directly transmitted to the wheel cylinders 31 , 32 and the hydraulic pressure provided from the hydraulic pressure supply unit 140 . It can be supplied to the wheel cylinders 31 , 32 , 33 , 34 through this hydraulic control unit 150 . When the first cut valve 195 is opened, the pressurized medium compressed in the master cylinder 120 may be directly supplied to the wheel cylinders 31 and 32 through the first backup flow path 191 .

The main hydraulic device 100a senses the hydraulic pressure of the pressurized medium provided by the hydraulic pressure supply unit 140 and outputs an electrical output signal (pressure signal) depending on the sensed hydraulic pressure. The first primary pressure sensor PS1a. and a first secondary pressure sensor PS1b. For example, the first primary pressure sensor PS1a is provided on the simulator flow path 131 and the first secondary pressure sensor PS1b is provided upstream of the first hydraulic circuit 160 to detect the hydraulic pressure of the pressurized medium. can However, the position and number of the pressure sensors are not limited, and may be provided in various numbers at various locations as long as they can sense hydraulic pressure.

Referring to FIG. 3 , the auxiliary hydraulic device 200a is provided between the first hydraulic circuit 160 and the first and second wheel cylinders 31 and 32 , and is operated due to a failure of the main hydraulic device 100a. It can be activated when disabled to provide hydraulic pressure to the first and second wheel cylinders 31 , 32 . A mode in which the auxiliary hydraulic device 200a operates due to the inability of the main hydraulic device 100a is referred to as a second fallback mode.

The auxiliary hydraulic device 200a includes a first isolation valve 251 that controls the flow of pressurized medium provided from the main hydraulic device 100a to the first wheel cylinder 31, and a second wheel from the main hydraulic device 100a. The second isolation valve 252 for controlling the flow of the pressurized medium delivered to the cylinder 32, the pump unit 210 for compressing the pressurized medium, and the first wheel for the pressurized medium compressed by the pump unit 210 a first auxiliary hydraulic circuit 221 for delivering to the cylinder 31 and a second auxiliary hydraulic circuit 222 for delivering the pressurized medium compressed by the pump unit 210 to the second wheel cylinder 32 . .

When the main hydraulic device 100a is in a failure or inoperable state, it may be switched to the second fallback mode. The first and second isolation valves 251 , 252 are closed, and the pump unit 210 can be operated.

The first and second isolation valves 251 and 252 are provided on the first and second transmission passages 61 and 62, respectively, and the main hydraulic device 100a and the first and second wheel cylinders 21 and 22 are provided. can allow or block hydraulic connections of

The first and second isolation valves 251 , 1652 allow hydraulic connection between the main hydraulic device 100a and the first and second wheel cylinders 31 , 32 in the normal operating mode and the first fallback mode, and the auxiliary In the second fallback mode in which the hydraulic device 200a operates, the hydraulic connection between the main hydraulic device 100a and the wheel cylinders 21 and 22 may be blocked.

The first and second isolation valves 251 and 252 are provided downstream of the first hydraulic circuit 160 to allow or block the flow of the pressurized medium. The first and second isolation valves 251 and 252 may be provided as normally open solenoid valves.

The pump unit 210 may receive the pressurized medium from the reservoir 110 to pressurize the pressurized medium. The pump unit 210 may include a first pump 211 and a second pump 212 , and the first pump 211 and the second pump 212 may be driven by a second motor 213 . have.

The first auxiliary hydraulic circuit 221 is connected to the first auxiliary hydraulic pressure passage 231 for transferring the pressurized medium compressed by the pump unit 210 to the first wheel cylinder 31 and the first auxiliary hydraulic pressure passage 231 . A first support valve 231a provided to control the flow of the pressurized medium, a first auxiliary dump passage 241 for discharging the pressurized medium applied to the first wheel cylinder 21, and a first auxiliary dump passage 241 and a first discharge valve 241a provided to control the flow of the pressurized medium. The first support valve 231a and the first discharge valve 241a may be implemented as normally closed solenoid valves.

The pressurized medium joined by the first pump 211 may be delivered to the first wheel cylinder 31 by the first auxiliary hydraulic pressure flow path 231 provided as the discharge side flow path of the first pump 211 . A first support valve 231a for controlling the flow of the pressurized medium transferred from the pump unit 210 to the first wheel cylinder 31 is provided in the first auxiliary hydraulic pressure passage 231 . The pressurized medium applied to the first wheel cylinder 31 may be discharged through the first auxiliary dump passage 241 . A first discharge valve 241a for controlling the flow of the pressurized medium discharged from the first wheel cylinder 21 is provided in the first auxiliary dump passage 241 .

The second auxiliary hydraulic circuit 222 is connected to a second auxiliary hydraulic pressure passage 232 for transferring the pressurized medium compressed by the pump unit 210 to the second wheel cylinder 32 and a second auxiliary hydraulic pressure passage 232 . A second support valve 232a provided to control the flow of the pressurized medium, a second auxiliary dump passage 242 for discharging the pressurized medium applied to the second wheel cylinder 22, and a second auxiliary dump passage 242 and a second discharge valve 242a provided to control the flow of the pressurized medium. The second support valve 232a and the second discharge valve 242a may be implemented as normally closed solenoid valves.

The pressurized medium joined by the second pump 212 may be delivered to the second wheel cylinder 32 by the second auxiliary hydraulic flow path 232 provided as the discharge side flow path of the second pump 212 . The second auxiliary hydraulic pressure passage 232 is provided with a second support valve 232a for controlling the flow of the pressurized medium transferred from the pump unit 210 to the second wheel cylinder 32 . The pressurized medium applied to the second wheel cylinder 32 may be discharged through the second auxiliary dump passage 242 . A second discharge valve 242a for controlling the flow of the pressurized medium discharged from the second wheel cylinder 22 is provided in the second auxiliary dump passage 242 .

The auxiliary hydraulic pressure device 200a includes a second pressure sensor PS2 that senses the hydraulic pressure of the pressurized medium and outputs an electrical output signal (pressure signal) depending on the sensed hydraulic pressure. For example, the second pressure sensor PS2 may be disposed between the first auxiliary hydraulic pressure passage 231 and the second auxiliary hydraulic pressure passage 232 . However, the position and number of the second pressure sensors PS2 are not limited, and various numbers may be provided at various locations as long as hydraulic pressure can be sensed.

4 shows hydraulic and electrical control of an electronic brake system according to an embodiment. 5 shows an electrical configuration of a main device and an auxiliary device included in the electronic brake according to an embodiment.

4 and 5 , the main device 100 is fluidly connected to the wheel cylinders 31 , 32 , 33 , 34 through the transmission passages 61 , 62 , 63 , 64 , and It is possible to provide hydraulic pressure for braking to the wheel cylinders 31 , 32 , 33 , 34 .

The auxiliary device 200 is provided on the first and second transmission passages 61 and 62 . Also, the auxiliary device 200 is electrically connected to the parking brakes 41 , 42 . The auxiliary device 200 may control each of the first and second parking brakes 41 and 42 through electrical connection. For example, the auxiliary device 200 provides an engagement signal to each of the first and second parking brakes 41 and 42 so that the parking brake is engaged, or the first and second parking brakes 41 so that the parking brake is released. , 42) may provide a fastening signal to each.

The main device 100 includes a main hydraulic device 100a and a first controller 100b.

The main hydraulic device 100a includes a pedal displacement sensor 51 , first pressure sensors PS1a and PS1b , a pressure supply unit 140 , and a first valve block 105 . The pedal displacement sensor 51 , the first pressure sensors PS1a , PS1b and the pressure supply unit 140 are the pedal displacement sensor 51 , the first pressure sensors PS1a , PS1b and the pressure supply unit described in conjunction with FIG. 3 . (140). Also, the first valve block 105 may include valves of the main hydraulic device 100a described in conjunction with FIG. 3 .

The first controller 100b may include a plurality of semiconductor elements, and may be variously referred to as an Electronic Control Unit (ECU). The first controller 100b may include, for example, a plurality of processors and/or a plurality of memories.

The first controller 100b includes a first processor 101 , a first driving circuit 103 , and a first power circuit 102 .

The first processor 101 configures the hydraulic pressure supply unit 140 and the first valve based on the output signal (displacement signal) of the pedal displacement sensor 51 and the output signal (pressure signal) of the first pressure sensors PS1a and PS1b. Block 105 can be controlled.

The first processor 101 may include a CAN transceiver that receives a communication signal from the auxiliary device 200 through the vehicle communication network NT and transmits the communication signal to the auxiliary device 200 . For example, the CAN transceiver may transmit, to the auxiliary device 200 , a communication signal indicating a state in which hydraulic pressure generation of the main device 100 is impossible (a state of failure or inability to control) under the control of the first processor 101 . .

The first processor 101 may include a memory that stores/stores a program and data for braking the vehicle depending on the driver's will to brake. In addition, the memory may provide programs and data to the first processor 101 , and store temporary data generated during an arithmetic operation of the first processor 101a. Memory includes volatile memory such as S-RAM (Static Random Access Memory, S-RAM) and D-RAM (Dynamic Random Access Memory, D-RAM), ROM (Read Only Memory), and Erasable Programmable Memory (EPROM). Read Only Memory (EPROM) and non-volatile memory such as flash memory.

The first processor 101, according to the program and data stored in the memory, based on the displacement signal of the pedal displacement sensor 51 and the pressure signal of the first pressure sensors PS1a, PS1b, the pressure supply unit 140 and 1 may provide a control signal to the valves of the valve block 105 . For example, the first processor 101 may provide a driving signal for generating hydraulic pressure to the hydraulic pressure supply unit 140 , and open/close to guide the hydraulic pressure to the wheel cylinders 31 , 32 , 33 , and 34 . A signal may be provided to the valves of the first valve block 105 .

The first processor 101a, according to the program and data stored in the memory, the hydraulic pressure generation impossible state (failure or out of control) can be identified. In response to identifying the hydraulic pressure generation impossible state of the main device 100 , the first processor 101 may transmit a communication signal indicating the hydraulic pressure generation impossible state of the main device 100 to the auxiliary device 200 . .

The first processor 101 may include one semiconductor device or a plurality of semiconductors. Also, the first processor 101 may include one core or a plurality of cores within one semiconductor device. The first processor 101 may be called variously, such as a micro controller unit (MCU).

The first power circuit 102 may include a voltage circuit for receiving power from the first battery B1 and converting a voltage of the received power into various voltages. The first power circuit 102 may distribute power having the converted voltage to each component of the main device 100 . For example, the first power circuit 102 may receive 15V power from the first battery B1 and provide 15V power to the first driving circuit 103 . Also, the first power circuit 102 may convert 15V power into 5V power and provide the 5V power to the first processor 101 .

The first driving circuit 103 may include a driving circuit that receives a control signal from the first processor 101 and provides a driving current to the first motor 141 of the hydraulic pressure supply unit 140 in response to the control signal. can For example, the first driving circuit 103 may include an inverter circuit that converts DC power supplied from the first power circuit 102 into AC power, and the inverter circuit is a control signal of the first processor 101 . In response, the converted AC current may be supplied to the first motor 141 .

In addition, the auxiliary device 200 includes an auxiliary hydraulic device 200a and a second controller 200b.

The auxiliary liquid device 200a includes a second pressure sensor PS2 , a pump unit 210 , and a second valve block 205 . The second pressure sensor PS2 and the pump unit 210 may be the same as the second pressure sensor PS2 and the pump unit 210 described with reference to FIG. 4 . In addition, the second valve block 205 may include valves of the auxiliary hydraulic device 200a described in conjunction with FIG. 4 .

The second controller 200b may include a plurality of semiconductor devices, and may be variously referred to as an ECU or the like. The second controller 200b may include, for example, a plurality of processors and/or a plurality of memories.

The second controller 100b includes a second processor 201 , a second driving circuit 203 , and a second power circuit 202 .

The second processor 201 may receive from the main device 100 a communication signal indicating an impossible state of hydraulic pressure generation (a state of failure or inability to control), the displacement signal of the pedal displacement sensor 51 and the second pressure sensor Based on the pressure signal of PS2, the pump unit 210 and the second valve block 205 may be controlled. The second processor 201 may directly obtain a displacement signal from the pedal displacement sensor 51 through a hard wire, or may receive a displacement signal from the main device 100 through a vehicle communication network NT.

Also, the second processor 201 may provide a parking signal (engagement signal or release signal) to the parking brakes 41 and 42 to engage or release the parking brakes 41 and 42 . The second processor 201 may provide a parking signal to the parking brakes 41 and 42 directly through a hard wire or transmit a parking signal to the parking brakes 41 and 42 through the vehicle communication network NT. .

The second processor 201 includes a memory for storing/storing programs and data for controlling the can transceiver and the auxiliary hydraulic device 200a communicating with the main device 100 through the vehicle communication network NT.

The second processor 201 transmits a parking signal for engaging or releasing the first and second parking brakes 41 and 42 according to the program and data stored in the memory to the first and second parking brakes 41 and 42 . can be provided to For example, the second processor 201 engages or releases the first and second parking brakes 41 , 42 directly from a parking lever or parking button of the vehicle 1 or via the vehicle communication network NT. may receive a parking command for , and may provide a parking signal to the first and second parking brakes 41 and 42 in response to the parking command.

In response to the engagement signal of the second processor 201 , each of the first and second parking brakes 41 and 42 may press the brake pad toward the brake disc with an electro-mechanical force. Further, in response to the release signal of the second processor 201 , each of the first and second parking brakes 41 and 42 may separate the brake pad from the brake disc with an electro-mechanical force.

The second power circuit 202 may receive power from the second battery B2 and convert a voltage of the received power into various voltages. The second power circuit 202 may distribute power having the converted voltage to each component of the auxiliary device 200 . For example, the second power circuit 202 may receive 15V power from the second battery B2 and provide 15V power to the second driving circuits 203 . In addition, the second power circuit 202 may convert 15V power into 5V power and provide the 5V power to the second processor 201 .

However, the second power circuit 202 is not limited to receiving power from the second battery B2 , and when the second power circuit 202 receives power through a power network different from that of the main device 100 , Suffice. For example, the second power circuit 202 may receive power from the first battery B1 through a power line different from that of the main device 100 .

The second driving circuit 203 may include a driving circuit that receives a control signal from the second processor 201 and provides a driving current to the second motor 213 of the pump unit 210 in response to the control signal. have. For example, the second driving circuit 203 may include an inverter circuit that converts DC power supplied from the second power circuit 202 into AC power, and the inverter circuit is a control signal of the second processor 201 . In response, the converted AC current may be supplied to the second motor 213 .

As described above, the main device 100 may provide hydraulic pressure to the wheel cylinders 31 , 32 , 33 , 34 in response to the driver's will to brake, and the auxiliary device 100 may ) of the first and second wheel cylinders ( 31, 32) can be provided with hydraulic pressure. In addition, the auxiliary device 200 engages or releases the first and second parking brakes 41 and 42 respectively installed on the third and fourth wheels 13 and 14, respectively. ) can control each of them.

Thereby, in the state where the hydraulic pressure generation of the main device 100 is impossible, the auxiliary device 200 can brake the vehicle in response to the driver's will to brake, and it is possible to improve the reliability of the electronic brake system 10 .

6 shows hydraulic and electrical control of an electronic brake system according to an embodiment. 7 illustrates an electrical configuration of a main device and an auxiliary device included in the electronic brake according to an embodiment.

As shown in FIG. 6 , the main device 100 is fluidly connected to the wheel cylinders 31 , 32 , 33 , 34 through the transmission passages 61 , 62 , 63 , 64 , and brakes the vehicle. It is possible to provide hydraulic pressure for the wheel cylinders 31 , 32 , 33 , 34 .

The main device 100 is electrically connected to the first parking brake 41 installed on the third wheel 13 , and may control the first parking brake 41 . In other words, the main device 100 may control to engage or release the first parking brake 41 .

The auxiliary device 200 is provided on the first and second transmission passages 61 and 62 between the main device 100 and the first and second wheel cylinders 31 and 32, and provides hydraulic pressure for braking the vehicle. The first and second wheel cylinders 31 and 32 may be provided.

The auxiliary device 200 is electrically connected to the second parking brake 42 installed on the fourth wheel 14 , and may control the second parking brake 42 . In other words, the auxiliary device 200 may control to engage or release the first parking brake 41 .

The main device 100 includes a main hydraulic device 100a and a first controller 100b. The configuration of the main hydraulic device 100a and the first controller 100b may be the same as those of the main hydraulic device 100a and the first controller 100b shown in FIGS. 4 and 5 .

However, the first processor 101 of the first controller 100b may control the first parking brake 41 installed on the third wheel 13 . Specifically, the first processor 101 receives a parking command for engaging or disengaging the parking brakes 41 , 42 directly from the parking lever or parking button of the vehicle 1 or via the vehicle communication network NT. can receive The first processor 101 may provide an engagement signal or a release signal to the first parking brake 41 in response to the engagement command or the release command. In response to the engagement signal or the release signal of the first processor 101 , the first parking brake 41 may be engaged or released. Also, the first processor 101 that has provided the engagement signal or the release signal to the first parking brake 41 may transmit a message indicating the engagement or release of the first parking brake 41 to the auxiliary device 200 .

Also, the first processor 101 may receive a parking command for engaging or disengaging the first parking brake 41 from the auxiliary device 200 . The first processor 101 may provide an engagement signal or a release signal to the first parking brake 41 in response to an engagement command or a release command of the auxiliary device 200 . The auxiliary device 200 may provide an auxiliary hydraulic pressure a device 200a and a second controller 200b. The configuration of the auxiliary hydraulic device 200a and the second controller 200b may be the same as that of the auxiliary hydraulic device 200a and the second controller 200b illustrated in FIGS. 4 and 5 .

However, the second processor 201 of the second controller 200b may control the second parking brake 42 installed on the fourth wheel 14 . Specifically, the second processor 201 receives a parking command for engaging or disengaging the parking brakes 41 and 42 directly from the parking lever or parking button of the vehicle 1 or via the vehicle communication network NT. can receive The second processor 201 may provide an engagement signal or a release signal to the second parking brake 42 in response to the engagement command or the release command. In response to the engagement signal or the release signal of the second processor 201 , the second parking brake 42 may be engaged or released. In addition, the second processor 201 that has provided an engagement signal or a release signal to the second parking brake 42 may transmit a message indicating engagement or release of the second parking brake 42 to the main device 100 .

The second processor 201 may receive a parking command for engaging or releasing the second parking brake 42 from the main device 100 . The second processor 201a may provide an engagement signal or a release signal to the second parking brake 42 in response to an engagement command or a release command of the main device 100 .

As described above, in a state where hydraulic pressure generation is impossible, the main device 100 may control the first parking brake 41 to engage or release the first parking brake 41 installed on the third wheel 13 . In addition, the auxiliary device 100 may control the second parking brake 42 to engage or release the second parking brake 42 installed on the fourth wheel 14 .

Thereby, in the state in which hydraulic pressure generation of the main device 100 is impossible, the main device 100 and the auxiliary device 200 can brake the vehicle in response to the driver's will to brake, and the reliability of the electronic brake system 10 . can improve

8 shows hydraulic and electrical control of an electronic brake system according to an embodiment. 9 shows an electrical configuration of a main device and an auxiliary device included in the electronic brake according to an embodiment.

As shown in FIG. 8 , the main device 100 is fluidly connected to the wheel cylinders 31 , 32 , 33 , 34 through the transmission passages 61 , 62 , 63 , 64 , and brakes the vehicle. It is possible to provide hydraulic pressure for the wheel cylinders 31 , 32 , 33 , 34 .

The main unit 100 is electrically connected to the first and second parking brakes 41 and 42 installed on the third and fourth wheels 13 and 14, and applies the first and second parking brakes 41 and 42. can be controlled In other words, the main device 100 may control to engage or release each of the first and second parking brakes 41 and 42 .

The auxiliary device 200 is provided on the first and second transmission passages 61 and 62 between the main device 100 and the first and second wheel cylinders 31 and 32, and provides hydraulic pressure for braking the vehicle. The first and second wheel cylinders 31 and 32 may be provided.

The auxiliary device 200 is electrically connected to the first and second parking brakes 41 and 42 installed on the third and fourth wheels 13 and 14, and applies the first and second parking brakes 41 and 42. can be controlled In other words, the auxiliary device 200 may control to engage or release each of the first and second parking brakes 41 and 42 .

The main device 100 includes a main hydraulic device 100a and a first controller 100b. The configuration of the main hydraulic device 100a and the first controller 100b may be the same as those of the main hydraulic device 100a and the first controller 100b shown in FIGS. 4 and 5 .

However, the first processor 101 of the first controller 101b may control the first and second parking brakes 41 and 42 installed on the third and fourth wheels 13 and 14 . Specifically, the first processor 101 receives a parking command for engaging or disengaging the parking brakes 41 , 42 directly from the parking lever or parking button of the vehicle 1 or via the vehicle communication network NT. can receive The first processor 101a may provide an engagement signal or a release signal to each of the first and second parking brakes 41 and 42 in response to the engagement command or the release command. In response to the engagement signal or the release signal of the first processor 101 , each of the first and second parking brakes 41 and 42 may be engaged or released. In addition, the first processor 101a that has provided an engagement signal or a release signal to the first and second parking brakes 41 and 42 sends a message indicating engagement or release of the first and second parking brakes 41 and 42 . It can be transmitted to the auxiliary device 200 .

The auxiliary device 200 includes an auxiliary hydraulic device 200a and a second controller 200b. The configuration of the auxiliary hydraulic device 200a and the second controller 200b may be the same as that of the auxiliary hydraulic device 200a and the second controller 200b illustrated in FIGS. 4 and 5 .

However, the second processor 201 of the second controller 200b may control the first and second parking brakes 41 and 42 installed on the third and fourth wheels 13 and 14, respectively. Specifically, the second processor 201 receives a parking command for engaging or disengaging the parking brakes 41 and 42 directly from the parking lever or parking button of the vehicle 1 or via the vehicle communication network NT. can receive The second processor 201 may provide an engagement signal or a release signal to each of the first and second parking brakes 41 and 42 in response to the engagement command or the release command. In response to an engagement signal or a release signal of the second processor 201a, each of the first and second parking brakes 41 and 42 may be engaged or released.

The second processor 201 may wait for a predetermined time after receiving a parking command for engaging or disengaging the parking brakes 41 and 42 . If a message indicating the engagement or release of the first and second parking brakes 41 and 42 is not received from the main device 100 within a predetermined time, the second processor 201 sends the first and second parking brakes ( 41, 42) may each be provided with an engagement signal or a release signal. On the other hand, if a message indicating engagement or release of the first and second parking brakes 41 and 42 is received from the main device 100 within a predetermined time, the second processor 201 sends the first and second parking brakes ( 41, 42) may not provide a fastening signal or a releasing signal to each.

As described above, in the state where hydraulic pressure generation is impossible, the main device 100 is configured to engage or release the first and second parking brakes 41 and 42 installed on the third and fourth wheels 13 and 14. Each of the first and second parking brakes 41 and 42 can be controlled, and the auxiliary device 100 also engages or releases the first and second parking brakes 41 and 42 to engage or release the first and second parking brakes 41 . , 42) can each be controlled.

Thereby, in the state in which hydraulic pressure generation of the main device 100 is impossible, the main device 100 and the auxiliary device 200 can brake the vehicle in response to the driver's will to brake, and the reliability of the electronic brake system 10 . can improve

The disclosed embodiments have been described with reference to the accompanying drawings as described above. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be practiced in other forms than the disclosed embodiments without changing the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

10: Electronic brake system
11: first wheel 12: second wheel
13: third wheel 14: fourth wheel
21: first brake caliper 22: second brake caliper
23: third brake caliper 24: fourth brake caliper
31: first wheel cylinder 32: second wheel cylinder
33: third wheel cylinder 34: fourth wheel cylinder
41: first parking brake 42: second parking brake
50: brake pedal 51: pedal displacement sensor
61: first transmission flow path 62: second transmission flow path
63: third delivery flow path 64: fourth delivery flow path
100: main unit 101: first processor
102: first power circuit 103: first driving circuit
105: first valve block 140: pressure supply unit
146: first motor 200: auxiliary device
201: second processor 202: second power circuit
203: second drive circuit 205: second valve block
210: pump unit 213: second motor
B1: first battery B2: second battery
PS1a: first primary pressure sensor PS1b: first secondary pressure sensor
PS2: second pressure sensor

Claims (18)

a main device for providing a first hydraulic pressure to a plurality of wheel cylinders respectively installed on the plurality of wheels, based on a position of a brake pedal; and
In a state in which the main device cannot generate the first hydraulic pressure, the second hydraulic pressure is applied to the first and second wheel cylinders respectively installed on the first and second wheels among the plurality of wheels based on the position of the brake pedal. including assistive devices that provide
the auxiliary device receives power from a different power network than the main device,
The auxiliary device controls at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels. According to claim 1,
The auxiliary device is an electronic brake system for engaging or releasing the first and second parking brakes respectively installed on the third and fourth wheels. According to claim 1,
The main device engages or releases the first parking brake installed on the third wheel,
The auxiliary device is an electronic brake system for engaging or releasing the second parking brake installed on the fourth wheel. According to claim 1,
The main device engages or releases the first and second parking brakes respectively installed on the third and fourth wheels,
The auxiliary device is an electronic brake system for engaging or releasing the first and second parking brakes respectively installed on the third and fourth wheels. 5. The method of claim 4,
the main device, in response to engaging or disengaging the first and second parking brakes, transmits a message indicating engagement or disengagement of the first and second parking brakes to the auxiliary device;
The auxiliary device engages or releases the first and second parking brakes respectively installed on the third and fourth wheels in response to not receiving the message from the main device within a predetermined time. According to claim 1,
The main unit provides the first hydraulic pressure to the plurality of wheel cylinders through a plurality of transmission passages,
The auxiliary unit is provided on first and second transfer passages respectively connected to the first and second wheel cylinders among the plurality of transfer passages, and is provided from the main unit through the first and second transfer passages. allowing providing the first hydraulic pressure to the first and second wheel cylinders, and providing the first hydraulic pressure to the first and second wheel cylinders from the main unit through the first and second transmission flow paths; An electromagnetic brake system for providing a second hydraulic pressure to the first and second wheel cylinders through the first and second transmission passages during shut-off. a hydraulic pressure generating unit that generates a first hydraulic pressure;
a hydraulic pressure control unit guiding the first hydraulic pressure to a plurality of wheel cylinders respectively installed on the plurality of wheels;
a first control unit controlling the hydraulic pressure generating unit to generate the first hydraulic pressure based on a position of the brake pedal and controlling the hydraulic pressure controlling unit to guide the first hydraulic pressure to the plurality of wheel cylinders;
a pump unit generating a second hydraulic pressure;
a second control unit for controlling the pump unit to provide the second hydraulic pressure to first and second wheel cylinders respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal;
the pump unit and the second control unit receive power from a different power network than the hydraulic pressure generating unit, the hydraulic pressure control unit and the first control unit;
The second control unit controls at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels. 8. The method of claim 7,
The second control unit transmits an engagement signal for engaging the first and second parking brakes or a release signal for releasing the first and second parking brakes to the first and second parking brakes. 8. The method of claim 7,
The first control unit transmits a fastening signal for engaging the first parking brake or a release signal for releasing the first parking brake to the first parking brake,
The second control unit transmits a fastening signal for engaging the second parking brake or a release signal for releasing the second parking brake to the second parking brake. 8. The method of claim 7,
The first control unit transmits a fastening signal for fastening the first and second parking brakes or a release signal for releasing the first and second parking brakes to the first and second parking brakes,
The second control unit transmits an engagement signal for engaging the first and second parking brakes or a release signal for releasing the first and second parking brakes to the first and second parking brakes. 11. The method of claim 10,
The first control unit transmits a message indicating engagement or release of the first and second parking brakes to the second control unit in response to engagement or release of the first and second parking brakes,
The second control unit, in response to not receiving the message from the first control unit within a predetermined time, a fastening signal for engaging the first and second parking brakes or releasing the first and second parking brakes An electronic brake system that transmits a release signal to the first and second parking brakes. The method of claim 7, wherein the electronic brake system comprises:
Among the plurality of transmission flow paths for providing the first hydraulic pressure to the plurality of wheel cylinders, first and second transmission paths respectively connected to the first and second wheel cylinders are opened or closed respectively. 2 Electronic brake system further comprising an isolation valve. The method of claim 12, wherein the second control unit
opening the first and second isolation valves so that the first hydraulic pressure is provided to the first and second wheel cylinders through the first and second transmission passages;
While closing the first and second isolation valves such that the first hydraulic pressure is provided to the first and second wheel cylinders through the first and second transfer flow passages, a second hydraulic pressure transfers the first and second transfer passages. An electronic brake system for controlling the pump unit to be provided to the first and second wheel cylinders through a flow path. A control method of an electronic brake system comprising: a main device for generating a first hydraulic pressure; and an auxiliary device for generating a second hydraulic pressure by receiving power from a power network different from the main device,
providing, by the main device, the first hydraulic pressure to the plurality of wheel cylinders respectively installed on the plurality of wheels, based on the position of the brake pedal;
First and second wheels respectively installed on first and second wheels among the plurality of wheels based on the position of the brake pedal in a state in which, by the auxiliary device, the main device cannot generate the first hydraulic pressure providing the second hydraulic pressure to a cylinder;
and controlling, by the auxiliary device, at least one of first and second parking brakes respectively installed on third and fourth wheels among the plurality of wheels in response to a driver's parking command. 15. The method of claim 14,
Controlling at least one of the first and second parking brakes may include, by the auxiliary device, engaging the first and second parking brakes respectively installed on the third and fourth wheels in response to the driver's parking command. A method of controlling an electronic brake system, comprising the actuating or disengaging. 15. The method of claim 14,
The control method of the electronic brake system further includes engaging or releasing the first parking brake installed on the third wheel by the main device,
The controlling of at least one of the first and second parking brakes includes engaging or releasing the second parking brake installed on the fourth wheel by the auxiliary device. 15. The method of claim 14,
The control method of the electronic brake system further includes engaging or releasing, by the main device, the first and second parking brakes respectively installed on the third and fourth wheels,
Controlling at least one of the first and second parking brakes includes, by the auxiliary device, engaging or releasing the first and second parking brakes respectively installed on the third and fourth wheels. How to control the system. 18. The method of claim 17,
The control method of the electronic brake system further includes, by the main device, transmitting a message indicating engagement or release of the first and second parking brakes to the auxiliary device,
Engagement or release of the first and second parking brakes includes the first and second parking brakes installed on the third and fourth wheels, respectively, in response to not receiving the message from the main device within a predetermined time period. A method of controlling an electronic brake system comprising engaging or disengaging a brake.

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