BRAKE SYSTEM AND METHOD OF CONTROLLING THE SAME

1 . A brake system comprising:

a manipulation part configured to provide a brake input;

a regenerative braking unit configured to perform regenerative braking;

a friction braking unit configured to perform friction braking; and

a control unit configured to control the brake system,

wherein the friction braking unit comprises:

a friction working part configured to brake a rotating body by friction;

a pneumatic line system configured to operate the friction working part;

a first valve part connected to the pneumatic line system; and

a second valve part connected to the pneumatic line system and connected in parallel to the first valve part.

2 . The brake system of claim 1 , wherein the manipulation part comprises:

a pedal; and

a valve opening/closing part connected to the pedal to open or close the first valve part.

3 . The brake system of claim 2 , further comprising a pedal sensor configured to measure a motion of the pedal.

4 . The brake system of claim 1 , wherein the regenerative braking unit comprises:

a power generation unit configured to convert a rotational motion of the rotating body into electric energy; and

a battery unit charged by receiving electricity from the power generation unit.

5 . The brake system of claim 4 , further comprising a charge amount measuring device configured to measure a charge level of the battery unit.

6 . The brake system of claim 1 , wherein the pneumatic line system comprises:

at least one storage tank configured to store compressed air; and

pneumatic lines connected to the storage tank.

7 . The brake system of claim 1 , wherein the pneumatic line system is connected to a hydraulic power assistance part which provides a braking force to the friction working part.

8 . The brake system of claim 1 , further comprising a third valve part connected in series to the second valve part.

9 . The brake system of claim 8 , further comprising:

a bypass pipeline which bypasses the third valve part; and

an emergency valve installed on the bypass pipeline.

10 . A method of controlling a brake system which performs regenerative braking and friction braking to brake a rotating body and comprises a first valve part connected to a pneumatic line system for the friction braking and a second valve part connected in parallel to the first valve part, the method comprising:

operating a manipulation part;

opening the first valve part in response to the operating the manipulation part; and

determining whether the regenerative braking works in response to the operating the manipulation part, and opening the second valve part if the regenerative braking does not work.

11 . The method of claim 10 , wherein the regenerative braking comprises:

a power generating operation of converting a rotational motion of the rotating body into electric energy; and

a charging operation of charging a battery unit with electricity generated in the power generating operation.

12 . The method of claim 11 , wherein the determining whether the regenerative braking works comprises determining whether the regenerative braking works by measuring a charge level of the battery unit in the charging operation.

13 . A method of controlling a brake system which performs regenerative braking and friction braking to brake a rotating body and comprises a first valve part connected to a pneumatic line system for the friction braking and a second valve part connected in parallel to the first valve part, the method comprising:

operating a manipulation part;

determining whether the regenerative braking works in response to the operating the manipulation part, and opening the second valve part if the regenerative braking does not work; and

opening the first valve part if an operation level of the manipulation part exceeds a predetermined state.

14 . The method of claim 13 , wherein the operating the manipulation part is performed by pressing a pedal, and

wherein if a stroke amount of the pedal exceeds a predetermined magnitude, it is considered that an operation level of the manipulation part exceeds the predetermined state, and the first valve part is open.

15 . The method of claim 13 , wherein the regenerative braking comprises:

a power generating operation of converting a rotational motion of the rotating body into electric energy; and

a charging operation of charging a battery unit with electricity generated in the power generating operation.

16 . The method of claim 15 , wherein the determining whether the regenerative braking works comprises determining whether the regenerative braking works by measuring a charge level of the battery unit in the charging operation.

17 . A method of controlling a brake system which performs regenerative braking and friction braking to brake a rotating body and comprises a first valve part connected to a pneumatic line system for the friction braking, a second valve part connected in parallel to the first valve part, and a third valve part connected in series to the second valve part, the method comprising:

operating a manipulation part;

opening the first and second valve parts in response to the operating the manipulation part; and

determining whether the regenerative braking works in response to the operating the manipulation part, and opening the third valve part if the regenerative braking does not work.

18 . The method of claim 17 , wherein the regenerative braking comprises:

a power generating operation of converting a rotational motion of the rotating body into electric energy; and

a charging operation of charging a battery unit with electricity generated in the power generating operation.

19 . The method of claim 18 , wherein the determining whether the regenerative braking works comprises determining whether the regenerative braking works by measuring a charge level of the battery unit in the charging operation.