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EP-4129780-B1 - ELECTRONIC BRAKE SYSTEM

EP4129780B1EP 4129780 B1EP4129780 B1EP 4129780B1EP-4129780-B1

Inventors

  • KIM, JINSEOK

Dates

Publication Date
20260506
Application Date
20210325

Claims (13)

  1. An electronic brake system (1) comprising: a first block (100) in which a mechanically operated mechanism part is arranged in cooperation with a brake pedal (10); a second block (200) in which an electronic part that is electronically operated and controlled by an electronic control unit is arranged, and which is arranged spaced apart from the first block (100); and a connecting line (400) for hydraulically connecting the first block (100) and the second block (200) to each other, wherein the mechanism part comprises a master cylinder (1200) including a first master piston (1220), a first master chamber (1220a), a second master piston (1230) which is provided so as to be displaceable by a hydraulic pressure in the first master chamber (1220a), and a second master chamber (1230a) which is variable in volume by a displacement of the second master piston (1230); the electronic part comprises a hydraulic control unit (1400) including a test valve (1900), a pedal simulator (1250), a hydraulic pressure supply device (1300) for generating hydraulic pressure by actuating a hydraulic piston (1320) by an electric signal, a first hydraulic circuit (1510) for controlling hydraulic pressure transmitted to two wheel cylinders (21, 22), and a second hydraulic circuit (1520) for controlling the hydraulic pressure to be transmitted to other two wheel cylinders (23, 24), characterized in that the first master piston (1220) is connected to the brake pedal (10), a volume of the first master chamber (1220a) is variable by a displacement of the first master piston (1220), and the connecting line (400) comprises: a first connecting line (410) having one end connected to the first master chamber (1220a) and the other end connected to the side of the first hydraulic circuit (1510); and a second connecting line (420) having one end connected to the second master chamber (1230a) and the other end branched and connected to each of the pedal simulator (1250) and the second hydraulic circuit side, wherein the test valve (1900) is provided at a front end of the branched point.
  2. The electronic brake system according to claim 1, wherein the mechanism part further comprises a main reservoir (1100a) in which a pressurizing medium is stored, the electronic part further comprises a sub-reservoir (1100b) in which a pressurizing medium is stored, and the connecting line (400) further comprises a third connecting line (430) having one end connected to the main reservoir (1100a), and the other end connected to the sub-reservoir (1100b).
  3. The electronic brake system according to claim 2, wherein the other end of the second connecting line (420) branches into a simulation flow path (421) connected to a front end of the pedal simulator (1250) , and a backup line (422) connected to the second hydraulic circuit side, and the electronic part further includes a first cut valve (411a) provided in the first connecting line (410) to control a flow of a pressurizing medium and a second cut valve (412a) disposed in the backup line (422) and to control a flow of the pressurizing medium.
  4. The electronic brake system according to claim 3, wherein the electronic part further comprises a simulator valve (403a) provided in the simulation flow path (421) to control a flow of a pressurizing medium.
  5. The electronic brake system according to claim 4, wherein the electronic part further comprises a first sub-reservoir flow path (1710) connecting the sub-reservoir (1100b) and a rear end of the first hydraulic circuit (1510), and a second sub-reservoir flow path (1720) connecting the sub-reservoir (1100b) and a rear end of the second hydraulic circuit (1520).
  6. The electronic brake system according to claim 5, wherein the electronic part further comprises a simulator discharge flow path (1251) connected to a rear end of the pedal simulator (1250), and the simulator discharge flow path (1251) joins the second sub-reservoir flow path (1720) and is connected to the sub-reservoir (1100b).
  7. The electronic brake system according to claim 5, wherein the hydraulic pressure supply device (1300) comprises a first pressure chamber (1130) provided in front of a hydraulic piston (1320) and a second pressure chamber (1340) provided in rear of the hydraulic piston (1320).
  8. The electronic brake system according to claim 7, wherein the electronic part further comprises a dump control part provided between the sub-reservoir (1100b) and the hydraulic pressure supply device (1300) to control a flow of a pressurizing medium, and the dump control part comprises a first dump control part for controlling a flow of a pressurizing medium between the first pressure chamber (1130) and the sub-reservoir (1100b), and a second dump control part for controlling a flow of a pressurizing medium between the second pressure chamber (1340) and the sub-reservoir (1100b).
  9. The electronic brake system according to claim 8, wherein the electronic part further comprises a third sub-reservoir flow path (1730) connecting the sub-reservoir (1100b) and the first dump control part, and a fourth sub-reservoir flow path (1740) connecting the sub-reservoir (1100b) and the second dump control part.
  10. The electronic brake system according to claim 5, wherein: the first hydraulic circuit (1510) comprises a first inlet valve and a second inlet valve that control a flow of a pressurizing medium supplied from the hydraulic supply device (1300) to the first wheel cylinder (21) and the second wheel cylinder (22), respectively, and a first outlet valve and second outlet valve that respectively control a flow of a pressurizing medium discharged from the first and second wheel cylinders (21, 22); the second hydraulic circuit (1520) comprises a third inlet valve and a fourth inlet valve for controlling a flow of a pressurizing medium supplied from the hydraulic pressure supply device (1300) to the third wheel cylinder (23) and the fourth wheel cylinder (24), respectively, and a third outlet valve and a fourth outlet valve for respectively controlling a flow of a pressurizing medium discharged from the third and fourth wheel cylinders (23, 24); the pressurizing medium discharged via the first and second outlet valves is supplied to the first sub-reservoir flow path (1710); and the pressurizing medium discharged via the third and fourth outlet valves is supplied to the second sub-reservoir flow path (1720).
  11. The electronic brake system according to claim 2, wherein the mechanism part further comprises a first main reservoir flow path (1110a) connecting the main reservoir (1100a) and the first master chamber (1220a), and a second main reservoir flow path connecting the main reservoir (1100a) to the second master chamber (1230a).
  12. The electronic brake system according to claim 2, wherein the first connecting line (410) and the second connecting line (420) are provided as rigid pipes, and the third connecting line (430) is provided as an elastic hose.
  13. The electronic brake system according to claim 6, wherein the pedal simulator (1250) comprises: a simulation piston (1252a) that is provided so as to be displaceable by a hydraulic pressure of a pressurizing medium supplied from the simulation flow path (421), a simulation chamber (1252b) of which volume is varied by the displacement of the simulation piston (1252a) and which communicates with the simulator discharge flow path (1251), and a simulation spring (1252c) that elastically supports the simulation piston (1252a).

Description

Technical Field The present invention relates to an electronic brake system and, more particularly, to an electric brake system for generating a braking force using an electrical signal corresponding to a displacement of a brake pedal. Background Art Vehicles are essentially equipped with brake systems for carrying out braking, and various types of brake systems have been proposed for the safety of drivers and passengers. Conventional brake systems have mainly used a way of supplying the wheel cylinder with the hydraulic pressure required for braking by means of a mechanically connected booster when a driver works a brake pedal. However, as the market demand for implementing various braking functions in close correspondence with the operating environment of a vehicle has increased, in recent years, an electronic brake system has been widely used in which a driver's braking intention is transmitted as an electrical signal from a pedal displacement sensor that senses the displacement of a brake pedal when the driver works the brake pedal, and based on this, a hydraulic pressure supply device is operated to supply the hydraulic pressure required for braking to a wheel cylinder. Such an electronic brake system generates and provides an electrical signal to a driver's brake pedal actuation in normal operating mode or to a vehicle's autonomous braking stage, on the basis of this, the hydraulic pressure supply is electrically actuated and controlled to generate and transmit the required hydraulic pressure to the wheel cylinder. In this way, the electronic brake system and the operating method are electrically operated and controlled, so that various braking actions may be realized in a complex manner, but in the event of a technical problem with the electrical component, the hydraulic pressure required for braking is not reliably built up, which may pose a threat to passenger safety. The electronic brake system thus enters an abnormal operating mode when a component is defective or corresponds to an uncontrollable state, wherein a mechanism is required in which a driver's brake pedal actuation must be directly linked to a wheel cylinder. Thus, in an abnormal operating mode of the electronic brake system, it is necessary for a driver to exert a braking force on a brake pedal, so that the hydraulic pressure required for braking is immediately built up and may be transferred directly into a wheel cylinder. Furthermore, there is a need for an accurate and quick check of the failure of the electronic brake system in order to quickly enter an abnormal operating mode in case of an emergency and to ensure the safety of a passenger. Meanwhile, there is a problem in mounting the electronic brake system on a vehicle that the design freedom of the vehicle is limited by the size and installation position limits of the system module. Accordingly, there is a need for an efficient system module installation while maintaining the braking performance of a vehicle. KR 2019 0136210 A describes an electronic brake system comprising: a hydraulic pressure generator including a master cylinder to which a master cylinder reservoir is coupled to generate hydraulic pressure; a hydraulic block provided with a hydraulic pressure supply device to generate the hydraulic pressure by an electrical signal output in response to displacement of a brake pedal and a hydraulic control unit to transmit the hydraulic pressure discharged from the hydraulic pressure supply device to wheel cylinders provided in each wheel, and disposed to be separated from the hydraulic pressure generator; a hydraulic block reservoir coupled to the hydraulic block; and a connection hose to connect the master cylinder reservoir and the hydraulic block reservoir. KR2017 0031400 A addresses an electronic brake system that comprises: a master cylinder which discharges oil in accordance with a pedal effort of a brake pedal; a simulation unit which is connected to the master cylinder, which has a simulator valve which is placed in a flow path which connects a simulation chamber accommodating oil to a first reservoir storing oil, and which provides a reaction force in accordance with the pedal effort of the brake pedal; and an inspection valve which is placed in a flow path which connects the master cylinder and the simulation unit. The simulator valve is placed to open a flow path, which connects the simulation chamber and the reservoir, in a normal mode, and to close a flow path, which connects the simulation chamber and the first reservoir, in an abnormal mode. The inspection valve is placed to open a flow path, which connects the master cylinder and the simulation chamber, in a brake mode, and to close the flow path, which connects the master cylinder and the simulation chamber, in an inspection mode. According to US 2013/232965 A1, an electric brake actuator is provided with a main reservoir attached to a vehicle frame, a first reservoir attached to an input device and couple