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EP-4129782-B1 - ELECTRONIC BRAKE SYSTEM

EP4129782B1EP 4129782 B1EP4129782 B1EP 4129782B1EP-4129782-B1

Inventors

  • KIM, JINSEOK

Dates

Publication Date
20260506
Application Date
20210325

Claims (15)

  1. An electronic brake system (1) comprising: a first block (100) in which an operating part operated in conjunction with a brake pedal (10) is arranged; 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 operating part comprises a master cylinder (1200) having a master piston (1420) connected to the brake pedal (10) and a master chamber (1220a) whose volume is variable by displacement of the master piston (1420), and the electronic part comprises a hydraulic control unit (1400) including 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, 22,9, 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 operating part comprises a pedal folding device (1250) provided between the master piston (1420) and the brake pedal (10); and the connecting line (1400) comprises a first connecting line (410) having a first branch line (411) connected at one end to the master chamber (1220a) and at the other end to be branched and connected to the first hydraulic circuit (1510), a second branch line (412) connected to the second hydraulic circuit (1520) and a third branch line (413) to be connected to the pedal simulator (1250).
  2. The electronic brake system according to claim 1, wherein the pedal folding device comprises: an actuator (1351) for generating and providing power; and a gear part (1452) disposed between the actuator (1351) and an input rod to convert a rotational force of the actuator (1351) into a linear motion of the input rod.
  3. The electronic brake system according to claim 1, wherein the operating 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 (1400) further comprises a second connecting line (420) having one end connected to the main reservoir (1100a), and the other end connected to the sub-reservoir (1100b).
  4. The electronic brake system according to claim 3, wherein the first connecting line (410) further comprises a fourth branch line (414) which has the other end which branches off and is connected to the sub-reservoir (1100b).
  5. The electronic brake system according to claim 1, further comprising: a first cut valve (411a) provided in the first branch line (411) to control a flow of a pressurizing medium; and a second cut valve (412a) provided in the second branch line (412) to control a flow of a pressurizing medium.
  6. The electronic brake system according to claim 5, wherein the electronic part further comprises a simulator valve (403a) provided in the third branch line (413) to control a flow of a pressurizing medium.
  7. The electronic brake system according to claim 4, wherein the electronic part further comprises a folding dump valve (414a) provided in the fourth branch line (414) to control a flow of a pressurizing medium.
  8. The electronic brake system according to claim 7, 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).
  9. The electronic brake system according to claim 8, wherein the fourth branch line (414) is joined to the second sub-reservoir flow path (1720) and connected to the sub-reservoir (1100b).
  10. The electronic brake system according to claim 8, 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).
  11. The electronic brake system according to claim 8, 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).
  12. The electronic brake system according to claim 11, 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).
  13. The electronic brake system according to claim 12, 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.
  14. The electronic brake system according to claim 8, 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 pressure 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).
  15. The electronic brake system according to claim 3, wherein the first connecting line (410) is provided as a rigid pipe, and the second connecting line (420) is provided as an elastic hose.

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 test 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. Further, recently, an autonomous driving system which recognizes ambient information from a camera, a radar, a sensor, or the like mounted on a vehicle, and in which based on this, the vehicle autonomously travels and stops without driver intervention has been developed. During autonomous driving of a vehicle, automatic performance is ensured on the basis of the sensed information independently of a driver's brake pedal operation, which not only hinders the comfort of occupancy of an operator when a brake pedal remains exposed to the vehicle's passenger space, but there is also a concern that a driver's leg is injured by an exposed brake pedal in a bump during autonomous driving. KR 2019 0136210 A describes electronic brake system comprises: 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. According to WO 2016/096465 A1, an electromechanical brake booster for a motor vehicle brake system comprises an electric drive motor for generating a boosting force, a gearing device which is coupled in so as to act between the electric drive motor and a piston rod or a piston of a master brake cylinder and which serves for converting a drive movement of the electric drive motor into a translational movement of the piston rod or of the piston with variable transmission ratio, and a thrust rod for coupling to a brake pedal. The thrust rod is coup