Electronic brake system

1. An electronic brake system including:

a pedal simulator configured to provide a reaction force according to a pedal force of a brake pedal;

an actuator configured to generate a hydraulic pressure using an actuator piston that operates by an electrical signal output corresponding to a displacement of the brake pedal, and including a first chamber provided at one side of the actuator piston movably accommodated in an actuator cylinder and connected to one or more wheel cylinders and a second chamber provided at the other side of the actuator piston and connected to one or more wheel cylinders;

a first hydraulic circuit including first and second inlet flow channels branched from a first hydraulic flow channel configured to communicate with the first chamber to be connected to two wheel cylinders, respectively;

a second hydraulic circuit including third and fourth inlet flow channels branched from a second hydraulic flow channel configured to communicate with the second chamber to be connected to two wheel cylinders, respectively; and

a reservoir connected to the actuator and the first and second hydraulic circuits and configured to store brake fluid,

wherein a hydraulic pressure unit connected from the actuator to the one or more wheel cylinders are hydraulically permanently separated from a pedal force unit connected from the brake pedal to the pedal simulator.

2. An electronic brake system including:

a pedal simulator configured to provide a reaction force according to a pedal force of a brake pedal;

an actuator configured to generate a hydraulic pressure using an actuator piston that operates by an electrical signal output corresponding to a displacement of the brake pedal, and including a first chamber provided at one side of the actuator piston movably accommodated in an actuator cylinder and connected to one or more wheel cylinders and a second chamber provided at the other side of the actuator piston and connected to one or more wheel cylinders;

a first hydraulic circuit including first and second inlet flow channels branched from a first hydraulic flow channel configured to communicate with the first chamber to be connected to two wheel cylinders, respectively;

a second hydraulic circuit including third and fourth inlet flow channels branched from a second hydraulic flow channel configured to communicate with the second chamber to be connected to two wheel cylinders, respectively;

a reservoir connected to the actuator and the first and second hydraulic circuits and configured to store brake fluid; and

an electronic control unit for signal processing and controlling of the actuator and electrical valves,

wherein a hydraulic pressure unit connected from the actuator to the one or more wheel cylinders are hydraulically separated from a pedal force unit connected from the brake pedal to the pedal simulator;

the actuator further includes a driving unit configured to generate a rotary force by power supplied thereto;

the driving unit includes a first driving unit and a second driving unit configured to selectively or together operate with the first driving unit; and

the electronic control unit includes a first electronic control unit connected to the first driving unit and a second electronic control unit connected to the second driving unit.

3. The electronic brake system claim 2 , wherein:

the driving unit is operated by the second electronic control unit when the first electronic control unit abnormally operates or is operated by the first electronic control unit when the second electronic control unit abnormally operates.

4. The electronic brake system of claim 3 , wherein:

one or more of the electronic valves controlled by the electronic control unit include two coils respectively connected to the first and second electronic control units; and

one of the two coils is operated by the second electronic control unit when the first electronic control unit operates abnormally, and the other one is operated by the first electronic control unit when the second electronic control unit operates abnormally.

5. The electronic brake system of claim 4 , further including:

a pedal displacement sensor configured to detect a displacement of the brake pedal;

a circuit hydraulic sensor configured to detect a hydraulic pressure of the first or second hydraulic circuit; and

a driving displacement sensor configured to detect an amount of rotation of the driving unit,

wherein one or more of the pedal displacement sensor, the circuit hydraulic sensor, and the driving displacement sensor each include a main sensor and an auxiliary sensor, and the auxiliary sensor is a redundancy sensor provided to operate when the main sensor abnormally operates.

6. The electronic brake system of claim 3 , wherein the first and second chambers are connected to each other with a balance valve.

7. The electronic brake system of claim 6 , wherein the balance valve is a normally closed type valve that operates to be normally closed and be opened when an opening signal is received.

8. The electronic brake system of claim 3 , further including:

a third hydraulic flow channel configured to communicate with the first chamber and be connected to the second hydraulic circuit; and

a fourth hydraulic flow channel configured to communicate with the second chamber and be connected to the first hydraulic circuit.

9. The electronic brake system of claim 8 , wherein the first to fourth hydraulic flow channels respectively include first to fourth hydraulic check valves configured to allow a fluid flow from the actuator only toward the one or more wheel cylinders.

10. The electronic brake system of claim 3 , wherein:

the actuator includes a piston cylinder unit configured to operate on the power from the driving unit and including the actuator piston and the first and second chambers; and

the driving unit includes a power transmission unit configured to convert the rotary force into straight-line motion of the actuator piston.

11. The electronic brake system of claim 10 , wherein:

the driving unit includes a motor including a stator and a rotor, and a rotation shaft member connected to the rotor to rotate together with the rotor;

the rotor includes a hollow therein; and

the rotation shaft member is disposed in the hollow of the rotor.

12. The electronic brake system of claim 3 , wherein:

the pedal simulator includes a simulator block including a simulator bore, a simulator piston configured to reciprocate in a straight line in the simulator bore, and a simulator elastic member disposed between the simulator piston in the simulator bore and the simulator block; and

the simulator piston is connected to the brake pedal via an input rod.

13. An electronic brake system including:

a pedal simulator configured to provide a reaction force according to a pedal force of a brake pedal;

an actuator configured to generate a hydraulic pressure using an actuator piston that operates by an electrical signal output corresponding to a displacement of the brake pedal, and including a first chamber provided at one side of the actuator piston movably accommodated in an actuator cylinder and connected to one or more wheel cylinders and a second chamber provided at the other side of the actuator piston and connected to one or more wheel cylinders;

a first hydraulic circuit including first and second inlet flow channels branched from a first hydraulic flow channel configured to communicate with the first chamber to be connected to two wheel cylinders, respectively;

a second hydraulic circuit including third and fourth inlet flow channels branched from a second hydraulic flow channel configured to communicate with the second chamber to be connected to two wheel cylinders, respectively; and

a reservoir connected to the actuator and the first and second hydraulic circuits and configured to store brake fluid,

wherein a hydraulic pressure unit connected from the actuator to the one or more wheel cylinders are hydraulically separated from a pedal force unit connected from the brake pedal to the pedal simulator;

the reservoir includes a first reservoir chamber configured to supply brake fluid to the actuator and receive brake fluid from the actuator, a second reservoir chamber configured to receive brake fluid from a first hydraulic circuit, and a third reservoir chamber configured to receive brake fluid from a second hydraulic circuit;

the first to third reservoir chambers communicate with each other by a partition a portion of which is open: and

the first reservoir chamber is divided at a center of the reservoir by the partition and the second to third reservoir chambers are divided at a side of the first reservoir chamber by the partition.

14. The electronic brake system of claim 13 , further including a first reservoir flow channel configured to connect the actuator and the first reservoir chamber,

wherein the first reservoir flow channel includes a fourth reservoir flow channel configured to supply brake fluid to the first chamber, a fifth reservoir flow channel configured to supply brake fluid to the second chamber, a sixth reservoir flow channel configured to draw brake fluid out from the first chamber, and a seventh reservoir flow channel configured to draw brake fluid out from the second chamber.

15. The electronic brake system of claim 14 , wherein:

a second reservoir flow channel that connects the second reservoir chamber and the first hydraulic circuit to each other includes first and second outlet flow channels branched to be connected to the two wheel cylinders, respectively; and

a third reservoir flow channel that connects the third reservoir chamber and the second hydraulic circuit to each other includes third and fourth outlet flow channels branched to be connected to the two wheel cylinders, respectively.

16. The electronic brake system of claim 15 , wherein:

first to fourth inlet valves configured to selectively allow a two-way fluid flow are installed at the first to fourth inlet flow channels, respectively; and

first to fourth outlet valves configured to selectively allow a two-way fluid flow are installed at the first to fourth outlet flow channels, respectively.

17. The electronic brake system of claim 16 , wherein the first to fourth inlet valves and the first to fourth outlet valves are normally open type valves that operate to be normally open and be closed when a closing signal is received.

18. The electronic brake system of claim 14 , wherein:

a first reservoir check valve configured to allow a fluid flow from the reservoir only toward the first chamber is installed at the fourth reservoir flow channel;

a second reservoir check valve configured to allow a fluid flow from the reservoir only toward the first chamber is installed at the fifth reservoir flow channel;

a third reservoir check valve configured to allow a fluid flow from the first chamber only toward the reservoir is installed at the sixth reservoir flow channel; and

a fourth reservoir check valve configured to allow a fluid flow from the second chamber only toward the reservoir is installed at the seventh reservoir flow channel.

19. The electronic brake system of claim 14 , wherein:

a first reservoir solenoid valve configured to selectively allow a two-way fluid flow is installed at the sixth reservoir flow channel; and

a second reservoir solenoid valve configured to selectively allow a two-way fluid flow is installed at the seventh reservoir flow channel.

20. The electronic brake system of claim 19 , wherein the first and second reservoir solenoid valves are normally closed type valves that operate to be normally closed and be open when an open signal is received.