Electronic brake system

Abstract

An electronic brake system is disclosed. An electronic brake system according to the present embodiment may comprise: a reservoir in which a pressurizing medium is stored; an integrated master cylinder comprising a master piston connected to a brake pedal, a master chamber having a volume varied by a displacement of the master piston, and a sealing member for sealing the master chamber; a liquid-pressure supply device for operating a hydraulic piston according to an electric signal that is output in response to a displacement of the brake pedal, thereby generating a liquid pressure; a hydraulic control unit provided between the liquid-pressure supply device and multiple wheel cylinders so as to control a flow of the pressurizing medium supplied to the multiple wheel cylinders; a circuit pressure sensor for sensing a liquid pressure provided by the liquid-pressure supply device; a cylinder pressure sensor for sensing a liquid pressure in the master chamber; an inspection channel for connecting the master chamber and the liquid-pressure supply device; and an inspection valve provided in the inspection channel so as to control the flow of the pressurizing medium.

1 . An electronic brake system comprising:
 a reservoir in which a pressurizing medium is stored;   an integrated master cylinder having a master piston connected to a brake pedal, a master chamber whose volume is varied by displacement of a master piston, and a sealing member for sealing the master chamber;   a hydraulic pressure supply device that generates hydraulic pressure by operating a hydraulic piston by an electric signal output in response to a displacement of the brake pedal;   a hydraulic control unit provided between the hydraulic pressure supply device and a plurality of wheel cylinders and configured to control a flow of a pressurizing medium supplied to the plurality of wheel cylinders;   a circuit pressure sensor for sensing a hydraulic pressure provided by the hydraulic pressure supply device;   a cylinder pressure sensor for sensing a hydraulic pressure in the master chamber;   a test flow path connecting the master chamber and the hydraulic pressure supply device; and   a test valve provided in the test flow path for controlling a flow of a pressurizing medium.   
     
     
         2 . The electronic brake system according to  claim 1 , wherein: the integrated master cylinder comprises a first master piston connected to the brake pedal, and a first master chamber whose volume is variable by a displacement of the first master piston; the test flow path has one end connected to the hydraulic pressure supply device side, and the other end branched into a first branch flow path and a second branch flow path to be connected respectively to the first master chamber; the test valve is provided in the first branch flow path; and the second branch flow path is provided with a test check valve that allows only a flow of a pressurizing medium from the first master chamber to the hydraulic pressure supply device. 
     
     
         3 . The electronic brake system according to  claim 2 , 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 rear of the hydraulic piston, and one end of the test flow path is connected to the second pressure chamber. 
     
     
         4 . The electronic brake system according to  claim 3 , further comprising a dump control unit provided between the reservoir and the hydraulic pressure supply device and configured to control a flow of a pressurizing medium, wherein the dump control unit comprises a first dump control unit for controlling a flow of a pressurizing medium between the first pressure chamber and the reservoir, and a second dump control unit for controlling a flow of a pressurizing medium between the second pressure chamber and the reservoir. 
     
     
         5 . The electronic brake system according to  claim 3 , wherein the integrated master cylinder further comprises a second master piston that is provided so as to be displaceable by displacement of the first master piston and a second master chamber that is variable in volume by the displacement of the second master piston, and the cylinder pressure sensor senses a hydraulic pressure of the second master chamber. 
     
     
         6 . The electronic brake system according to  claim 5 , wherein the integrated master cylinder further comprises: a first sealing member for sealing the first master chamber with respect to the outside; a second sealing member that seals the first master chamber with respect to the second master chamber; and a third seal member that blocks the flow of a pressurizing medium from the first branch flow path into the first master chamber. 
     
     
         7 . The electronic brake system according to  claim 6 , wherein the first sealing member is provided on a rear side of the third sealing member, and the second branch flow path is connected between the first sealing member and the third sealing member on the integrated master cylinder. 
     
     
         8 . The electronic brake system according to  claim 7 , wherein the first master piston comprises a first cut-off hole communicating the first master chamber and the second branch flow path in a non-operational state. 
     
     
         9 . The electronic brake system according to  claim 5 , further comprising: a first reservoir flow path connecting the reservoir and the first master chamber; and a simulator valve provided in the first reservoir flow path to control a flow of a pressurizing medium between the reservoir and the first master chamber. 
     
     
         10 . The electronic brake system according to  claim 9 , wherein the hydraulic control unit further comprises: a first backup flow path including a first hydraulic circuit for controlling a flow of a pressurizing medium supplied to a first wheel cylinder and a second wheel cylinder and a second hydraulic circuit for controlling a flow of a pressurizing medium supplied to third and fourth wheel cylinders, and connecting the first master chamber and the first hydraulic circuit; and a second backup flow path connecting the second master chamber and the second hydraulic circuit. 
     
     
         11 . The electronic brake system according to  claim 10 , further comprising: a first cut valve provided in the first backup flow path to control a flow of a pressurizing medium; and a second cut valve provided in the second backup flow path to control a flow of the pressurizing medium. 
     
     
         12 . The electronic brake system according to  claim 5 , wherein the integrated master cylinder further comprises a pedal simulator arranged between the first master piston and the second master piston to provide a pedal sensation via an elastic restoring force occurring during compression. 
     
     
         13 . The electronic brake system according to  claim 6 , further comprising a second reservoir flow path connecting the reservoir and the second master chamber, wherein the integrated master cylinder further comprises a fourth sealing member for blocking a flow of a pressurizing medium discharged from the second master chamber to the second reservoir flow path. 
     
     
         14 . The electronic brake system according to  claim 13 , wherein the second master piston comprises a second cut-off hole communicating the second master chamber and the second reservoir flow path in a non-operational state. 
     
     
         15 . The electronic brake system according to  claim 9 , wherein: the hydraulic control unit comprises a first hydraulic circuit for controlling a flow of a pressurizing medium supplied to the first wheel cylinder and the second wheel cylinder, and a second hydraulic circuit for controlling a flow of a pressurizing medium supplied to the third and fourth wheel cylinders; the third wheel cylinder and the fourth wheel cylinder are each provided with a generator; the hydraulic control unit comprises a solenoid valve that blocks transmission of hydraulic pressure of a pressurizing medium to the third wheel cylinder and the fourth wheel cylinder in a regenerative braking mode.