Electric brake system

1. An electronic brake system comprising:

a master cylinder connected to a reservoir in which brake fluid is stored and configured to discharge the brake fluid according to a pedal effort of a brake pedal, the master cylinder including first and second master chambers and first and second pistons provided in the master chambers;

a hydraulic pressure supply device activated by an electrical signal to generate a hydraulic pressure;

a hydraulic pressure control unit configured to transfer, to a plurality of wheel cylinders provided in wheels, a hydraulic pressure discharged from the hydraulic pressure supply device;

a first backup flow path configured to connect the first master chamber to the hydraulic pressure control unit;

a second backup flow path configured to connect the second master chamber to the hydraulic pressure control unit;

a first cut valve configured to selectively open and close the first backup flow path; a second cut valve configured to selectively open and close the second backup flow path; and

a plurality of inlet valves installed on an upstream side of the plurality of wheel cylinders provided in the wheels,

wherein:

the first backup flow path is connected to the first master chamber and a downstream side of one of the plurality of inlet valves installed on the upstream side of the plurality of wheel cylinders,

the second backup flow path is connected to the second master chamber and a downstream side of an other of the plurality of inlet valves installed on the upstream side of the plurality of wheel cylinders,

the electronic brake system further comprises an electronic control unit configured to control operation of the first and second cut valves, and the plurality of inlet valves, and

the electronic control unit is configured to, when an abnormal condition in which the first cut valve or the second cut valve leaks, open one cut valve which leaks among the first and second cut valves and close another cut valve which does not leak among the first and second cut valves, a hydraulic pressure formed in the master cylinder by a displacement of the brake pedal is transferred to one of the plurality of wheel cylinders through one of the first and second backup flow paths having the one cut valve which leaks among the first and second cut valves, and the hydraulic pressure generated by the hydraulic pressure supply device is transferred to an other of the plurality of wheel cylinders.

2. The electronic brake system of claim 1 , further comprising:

a simulation device configured to provide a reaction force corresponding to the pedal effort of the brake pedal, the simulation device including a simulation chamber connected to the master cylinder and configured to house brake fluid; and

a simulation valve configured to selectively open and close brake fluid flow flowing into the simulation chamber.

3. The electronic brake system of claim 2 , wherein the simulation valve is installed in a flow path for connecting the first backup flow path to the simulation chamber.

4. The electronic brake system of claim 2 , wherein when the first cut valve is leaking, the electronic control unit opens the first cut valve and closes the second cut valve and the simulation valve, and a hydraulic pressure generated in the master cylinder by forward movement of the brake pedal is transferred to the one or more of the plurality of wheel cylinders along the first backup flow path.

5. The electronic brake system of claim 4 ,

wherein the hydraulic pressure control unit includes first to fourth branch flow paths connected to the plurality of wheel cylinders provided in the wheels,

wherein the plurality of inlet valves include first to fourth inlet valves installed in the first to fourth branch flow paths,

wherein the electronic control unit, when the first cut valve leaks, closes the first inlet valve installed in the first branch flow path connected to the first backup flow path, and

wherein the electronic control unit, when the first cut valve leaks, opens the second to fourth inlet valves so that the hydraulic pressure generated in the hydraulic pressure supply device is transferred to the plurality of wheel cylinders through the second to fourth branch flow paths.

6. The electronic brake system of claim 2 , wherein when the second cut valve is leaking, the electronic control unit opens the second cut valve and closes the first cut valve and the simulation valve, and a hydraulic pressure generated in the master cylinder by forward movement of the brake pedal is transferred to the different one or more of the plurality of wheel cylinders along the second backup flow path.

7. The electronic brake system of claim 6 ,

wherein the hydraulic pressure control unit includes first to fourth branch flow paths connected to the plurality of wheel cylinders provided in the wheels,

wherein the plurality of inlet valves include first to fourth inlet valves installed in the first to fourth branch flow paths,

wherein the electronic control unit, when the second cut valve leaks, closes the fourth inlet valve installed in the fourth branch flow path connected to the second backup flow path, and

wherein the electronic control unit, when the second cut valve leaks, opens the first to third inlet valves so that the hydraulic pressure generated in the hydraulic pressure supply device is transferred to the plurality of wheel cylinders through the first to third branch flow paths.

8. The electronic brake system of claim 2 , wherein when the simulation valve is stuck in a closed state, the electronic control unit opens the first cut valve and closes the second cut valve, and a hydraulic pressure generated in the master cylinder by forward movement of the brake pedal is transferred to the one or more of the plurality of wheel cylinders along the first backup flow path.

9. The electronic brake system of claim 8 ,

wherein the hydraulic pressure control unit includes first to fourth branch flow paths connected to the plurality of wheel cylinders provided in the wheels,

wherein the plurality of inlet valves include first to fourth inlet valves installed in the first to fourth branch flow paths,

wherein the electronic control unit, when the simulation valve is stuck in the closed state, closes the first inlet valve installed in the first branch flow path connected to the first backup flow path, and

wherein the electronic control unit, when the simulation valve is stuck in the closed state, opens the second to fourth inlet valves so that the hydraulic pressure generated in the hydraulic pressure supply device is transferred to the plurality of wheel cylinders through the second to fourth branch flow paths.

10. The electronic brake system of claim 1 , further comprising a pedal displacement sensor configured to output an electrical signal corresponding to a displacement of the brake pedal,

wherein the hydraulic pressure supply device is activated by the electrical signal of the pedal displacement sensor.

11. The electronic brake system of claim 1 ,

wherein the hydraulic pressure supply device generates a hydraulic pressure by the piston activated by an output electrical signal corresponding to a displacement of the brake pedal and includes a first pressure chamber provided at one side of the piston, which is movably housed inside a cylinder block, and connected to one or more of the plurality of wheel cylinders, and a second pressure chamber provided at another side of the piston and connected to one or more of the plurality of wheel cylinders, and

wherein the electronic brake system further comprises: a first hydraulic flow path communicating with the first pressure chamber; second and third hydraulic flow paths branching from the first hydraulic flow path;

a first hydraulic circuit including a first branch flow path and a second branch flow path branching from the second hydraulic flow path, the first branch flow path connected to a first wheel cylinder of the plurality of wheel cylinders and the second branch flow path connected to a second wheel cylinder of the plurality of wheel cylinders; and

a second hydraulic circuit including third and fourth branch flow paths branching from the third hydraulic flow path, the third branch flow path connected to a third wheel cylinder of the plurality of wheel cylinders and the fourth branch flow path connected to a fourth wheel cylinder of the plurality of wheel cylinders.

12. The electronic brake system of claim 11 ,

wherein the plurality of inlet valves include first to fourth inlet valves installed in the first to fourth branch flow paths to selectively open and close brake fluid flow, and

wherein the first backup flow path connects the first master chamber to a downstream side of the first inlet valve, or the second backup flow path connects the second master chamber to a downstream side of the fourth inlet valve.

13. The electronic brake system of claim 11 , further comprising:

a fourth hydraulic flow path communicating with the second pressure chamber;

a fifth hydraulic flow path branching from the fourth hydraulic flow path and joining the second hydraulic flow path; and

a sixth hydraulic flow path branching from the fourth hydraulic flow path and joining the third hydraulic flow path.

14. The electronic brake system of claim 1 , further comprising:

a reservoir flow path configured to connect the reservoir to the master cylinder;

a bypass flow path bypassing the reservoir flow path; and

an inspection valve configured to selectively open and close the bypass flow path.

15. An electronic brake system comprising:

a master cylinder connected to a reservoir in which brake fluid is stored and configured to discharge the brake fluid according to a pedal effort of a brake pedal, the master cylinder including first and second master chambers and first and second pistons provided in the master chambers;

a hydraulic pressure supply device activated by an electrical signal to generate a hydraulic pressure;

a hydraulic pressure control unit configured to transfer, to a plurality of wheel cylinders provided in wheels, a hydraulic pressure discharged from the hydraulic pressure supply device;

a first backup flow path configured to connect the first master chamber to the hydraulic pressure control unit;

a second backup flow path configured to connect the second master chamber to the hydraulic pressure control unit;

a first cut valve configured to selectively open and close the first backup flow path; and

a second cut valve configured to selectively open and close the second backup flow path,

wherein the first backup flow path is connected to one of the first or second master chambers and one or more of the plurality of wheel cylinders, and/or

wherein the second backup flow path is connected to the other of the first or second master chambers and a different one or more of the plurality of the wheel cylinders,

wherein the hydraulic pressure supply device includes a motor activated by an output electrical signal corresponding to a displacement of the brake pedal, a power converter configured to convert a rotational force of the motor into translational motion, a cylinder block, a piston connected to the power converter and movably housed inside the cylinder block, a first pressure chamber provided at one side of the piston and connected to the one or more of the plurality of wheel cylinders, and a second pressure chamber provided at another side of the piston and connected to the one or more of the plurality of wheel cylinders,

wherein a plurality of inlet valves include first to fourth inlet valves, and

wherein the electronic brake system further comprises:

a first hydraulic flow path communicating with the first pressure chamber and configured to provide a hydraulic pressure generated in the first pressure chamber to the one or more of the plurality of wheel cylinders;

a second hydraulic flow path communicating with the first pressure chamber and configured to provide a hydraulic pressure generated in the first pressure chamber to the different one or more of the plurality of wheel cylinders;

a third hydraulic flow path communicating with the second pressure chamber, joining the first hydraulic flow path, and configured to provide a hydraulic pressure generated in the second pressure chamber to the one or more of the plurality of wheel cylinders;

a fourth hydraulic flow path allowing the first hydraulic flow path to communicate with the second hydraulic flow path to transfer a hydraulic pressure of the one or more of the plurality of wheel cylinders to the first pressure chamber;

a fifth hydraulic flow path allowing the fourth hydraulic flow path to communicate with the first hydraulic flow path or the second hydraulic flow path to transfer a hydraulic pressure of the one or more of the plurality of wheel cylinders to the first pressure chamber;

a first control valve provided in the first hydraulic flow path and configured to control brake fluid flow;

a second control valve provided in the second hydraulic flow path and configured to control brake fluid flow;

a third control valve provided in the third hydraulic flow path and configured to control brake fluid flow;

a fifth control valve provided in the fourth hydraulic flow path or the fifth hydraulic flow path and configured to control brake fluid flow;

a first hydraulic circuit including first and second branch flow paths branching from the first hydraulic flow path and connecting to two wheel cylinders of the plurality of wheel cylinders, and the first and second inlet valves configured to control the first and second branch flow paths;

a second hydraulic circuit including third and fourth branch flow paths branching from the second hydraulic flow path and connecting to two other wheel cylinders of the plurality of wheel cylinders; and

an electronic control unit (ECU) configured to control operation of the motor and control operation of the fifth control valve and the first to fourth inlet valves.

16. The electronic brake system of claim 15 , further comprising:

a sixth hydraulic flow path communicating with the second pressure chamber, joining the second hydraulic flow path, and configured to provide the hydraulic pressure generated in the second pressure chamber to the one or more of the plurality of wheel cylinders; and

a fourth control valve provided in the sixth hydraulic flow path and configured to control brake fluid flow.