Electric brake system
Disclosed herein an electronic brake system includes a first block comprising a master cylinder having a first master piston connected to a brake pedal and a first master chamber whose volume is changed by a displacement of the first master piston; a second block comprising a pedal simulator, a hydraulic pressure supply device that generates a hydraulic pressure by operating a hydraulic piston according to an electrical signal, and a hydraulic control unit comprising a first hydraulic circuit that controls a hydraulic pressure transferred to two wheel cylinders and a second hydraulic circuit that controls a hydraulic pressure transferred to the other two wheel cylinders, the second block disposed to be spaced apart from the first block; a plurality of electronic control units (ECUs) that controls various devices and valves based on hydraulic pressure information and displacement information of the brake pedal; and a connection line having one end connected to the first block and the other end connected to the second block; wherein the connection line has one end connected to the first master chamber and the other end thereof connected to the pedal simulator side.
1. An electronic brake system, comprising:
a first block comprising a master cylinder including a first master piston connected to a brake pedal and a first master chamber whose volume is changed by a displacement of the first master piston;
a second block comprising a pedal simulator, a hydraulic pressure supply device that generates a hydraulic pressure by operating a hydraulic piston according to an electrical signal, a hydraulic control unit comprising a first hydraulic circuit that controls a hydraulic pressure transferred to two wheel cylinders and a second hydraulic circuit that controls a hydraulic pressure transferred to other two wheel cylinders, the second block disposed to be spaced apart from the first block;
a plurality of electronic control units (ECUs) configured to control valves based on hydraulic pressure information and displacement information of the brake pedal; and
a first connection line having one end connected to the first block and the other end connected to the second block;
wherein the first connection line has one end connected to the first master chamber and another end connected to the pedal simulator without being connected with the first and second hydraulic circuits, such that when the first master piston advances, a medium accommodated in the first master chamber is transferred only to the pedal simulator through the first connection line.
2. The electronic brake system of claim 1 , wherein
the master cylinder further comprises a second master piston provided to be displaceable by a hydraulic pressure of the first master chamber, and a second master chamber whose volume is changed by a displacement of the second master piston, and
the electronic brake system further comprises a second connection line having one end connected to the second master chamber and another end connected to the second hydraulic circuit.
3. The electronic brake system of claim 2 , wherein
the first block further comprises a main reservoir in which the medium is stored, and
the second block further comprises a sub-reservoir in which the medium is stored, and the electronic brake system further comprises a third connection line having one end connected to the main reservoir and the other end thereof connected to the sub-reservoir.
4. The electronic brake system of claim 3 , wherein
the second block further comprises:
an outlet flow path connecting the first hydraulic circuit and the sub-reservoir;
a first cut valve provided in the outlet flow path to control a flow of the medium; and
a second cut valve provided on the second connection line to control a flow of the medium.
5. The electronic brake system of claim 4 , wherein
the second block further comprises:
a first sub-reservoir flow path connecting the sub-reservoir and a rear end of the first hydraulic circuit; and
a second sub-reservoir flow path connecting the sub-reservoir and a rear end of the second hydraulic circuit.
6. The electronic brake system of claim 5 , wherein
the second block further comprises a simulator discharge passage connected to a rear end of the pedal simulator, and
the simulator discharge passage joins the first sub-reservoir flow path and is connected to the sub-reservoir.
7. The electronic brake system of claim 2 , wherein
the hydraulic control unit further comprises a balance passage connecting the first hydraulic circuit and the second hydraulic circuit, and a balance valve provided in the balance passage to control a flow of the medium.
8. The electronic brake system of claim 1 , wherein
the first block further comprises a pedal folding device provided between the first master piston and the brake pedal.
9. The electronic brake system of claim 8 , wherein
the first block further comprises a main reservoir in which the medium is stored, and
the second block further comprises a sub-reservoir in which the medium is stored, and
the electronic brake system further comprises a second connection line having one end connected to the main reservoir and the other end thereof connected to the sub-reservoir.
10. The electronic brake system of claim 9 , wherein
the second block further comprises:
a first sub-reservoir flow path connecting the sub-reservoir and a rear end of the first hydraulic circuit; and
a second sub-reservoir flow path connecting the sub-reservoir and a rear end of the second hydraulic circuit.
11. The electronic brake system of claim 10 , wherein
the second block further comprises:
a first outlet flow path connecting the first hydraulic circuit and the first sub-reservoir flow path;
a second outlet flow path connecting the second hydraulic circuit and the sub-reservoir;
a first cut valve provided in the first outlet flow path to control a flow of the medium; and
a second cut valve provided in the second outlet flow path to control a flow of the medium.
12. The electronic brake system of claim 10 , wherein
the second block further comprises a simulator discharge passage connected to a rear end of the pedal simulator, and
the simulator discharge passage joins the first sub-reservoir flow path and is connected to the sub-reservoir.
13. The electronic brake system of claim 8 , wherein
the pedal folding device comprises:
an actuator that generates and provides a power; and
a gear unit provided between the actuator and an input rod connected to the brake pedal and is configured to convert a rotational force of the actuator into a linear motion of the input rod.
14. The electronic brake system of claim 5 , wherein
the hydraulic pressure supply device comprises a first pressure chamber provided in front of the hydraulic piston and a second pressure chamber provided in a rear of the hydraulic piston.
15. The electronic brake system of claim 14 , wherein
the second block further comprises a dump control unit provided between the sub-reservoir and the hydraulic pressure supply device to control a flow of the medium, and
the dump control unit comprises a first dump control unit that controls a flow of the medium between the first pressure chamber and the sub-reservoir, and a second dump control unit that controls a flow of the medium between the second pressure chamber and the sub-reservoir.
16. The electronic brake system of claim 15 , wherein
the second block further comprises a third sub-reservoir flow path connecting the sub-reservoir and the first dump control unit, and a fourth sub-reservoir flow path connecting the sub-reservoir and the second dump control unit.
17. The electronic brake system of claim 1 , wherein
the plurality of ECUs comprises a first ECU that controls various devices and valves, and a second ECU that operates when the first ECU operates abnormally.