KR-20260063330-A - ELECTRIC BRAKE SYSTEM AND CONTROLLING METHOD THEREOF

Abstract

An electronic brake system comprises: a hydraulic pressure supply device that generates hydraulic pressure of a pressurized medium; and a hydraulic control unit provided between the hydraulic pressure supply device and a plurality of wheel cylinders, which transmits the hydraulic pressure generated by the hydraulic pressure supply device to the plurality of wheel cylinders. The apparatus includes an auxiliary brake module that provides hydraulic pressure to a first wheel cylinder and a second wheel cylinder among the plurality of wheel cylinders, wherein the auxiliary brake module may include a first accumulator that temporarily stores a pressurized medium discharged from the first wheel cylinder, a first auxiliary supply path to which the first accumulator is connected and a first connecting path connecting the hydraulic control unit and the first wheel cylinder is connected, a first pump that pressurizes the pressurized medium supplied through the first auxiliary supply path, a motor that operates the first pump, a first auxiliary path that transmits the pressurized medium pressurized by the first pump to the first wheel cylinder, a first auxiliary supply valve provided in the first auxiliary supply path to control the supply of the pressurized medium supplied to the first pump, and a first pressure regulating valve that regulates the pressure of the first auxiliary path.

Inventors

• 김연성
• 강기원

Assignees

• 에이치엘만도 주식회사

Dates

Publication Date

20260507

Application Date

20241030

Claims (20)

1. A hydraulic pressure supply device that generates hydraulic pressure of a pressurized medium; A hydraulic control unit provided between the above hydraulic pressure supply device and a plurality of wheel cylinders, and transmitting the hydraulic pressure generated by the above hydraulic pressure supply device to the plurality of wheel cylinders; and It includes an auxiliary brake module that provides hydraulic pressure to a first wheel cylinder and a second wheel cylinder among the plurality of wheel cylinders above, The above auxiliary brake module is, A first accumulator for temporarily storing a pressurized medium discharged from the first wheel cylinder; a first auxiliary supply path connected to the first accumulator and connected to a first connecting path connecting the hydraulic control unit and the first wheel cylinder; a first pump for pressurizing the pressurized medium supplied through the first auxiliary supply path; a motor for operating the first pump; a first auxiliary path for delivering the pressurized medium pressurized by the first pump to the first wheel cylinder; a first auxiliary supply valve provided in the first auxiliary supply path for controlling the supply of the pressurized medium to the first pump; and a first pressure regulating valve for regulating the pressure of the first auxiliary path. Electronic brake system.
2. In paragraph 1, A control circuit further comprising, based on receiving a braking request from an external controller during the inability of the above hydraulic pressure supply device to operate, the first pressure regulating valve to close, the first auxiliary supply valve to open, and the motor to operate the first pump. Electronic brake system.
3. In paragraph 2, A pressurized medium stored in the first accumulator is supplied to the first pump in accordance with the closing of the first pressure regulating valve and the opening of the first auxiliary supply valve. Electronic brake system.
4. In paragraph 3, A pressurized medium supplied to the first pump through the first connecting path is further supplied in accordance with the closing of the first pressure regulating valve and the opening of the first auxiliary supply valve. Electronic brake system.
5. In paragraph 2, The above control circuit is, Based on receiving a braking request via the brake pedal while the above hydraulic pressure supply device is inoperable, the first pressure regulating valve is opened, the first auxiliary supply valve is closed, and the motor is controlled to stop the operation of the first pump. Electronic brake system.
6. In paragraph 5, As the first pressure regulating valve is in an open state and the first auxiliary supply valve is in a closed state, the pressurized medium discharged from the first wheel cylinder is temporarily stored in the first accumulator. Electronic brake system.
7. In paragraph 1, The above auxiliary brake module is, The apparatus further comprises a second accumulator for temporarily storing a pressurized medium discharged from the second wheel cylinder, a second connecting passage connecting the hydraulic control unit and the second wheel cylinder and a second auxiliary supply passage connected to the first accumulator, a second pump for pressurizing the pressurized medium supplied through the second auxiliary supply passage, a second auxiliary passage for delivering the pressurized medium pressurized by the second pump to the second wheel cylinder, a second auxiliary supply valve provided in the second auxiliary supply passage for controlling the supply of the pressurized medium to the second pump, and a second pressure regulating valve for regulating the pressure of the second auxiliary passage. The second pump above is driven by the motor, Electronic brake system.
8. In Paragraph 7, A control circuit further comprising, based on receiving a braking request from an external controller during the inability of the above hydraulic pressure supply device to operate, the second pressure regulating valve to close, the second auxiliary supply valve to open, and the motor to operate the second pump. Electronic brake system.
9. In paragraph 8, A pressurized medium stored in the second accumulator is supplied to the second pump in accordance with the closing of the second pressure regulating valve and the opening of the second auxiliary supply valve. Electronic brake system.
10. In Paragraph 9, A pressurized medium supplied to the second pump through the second connecting path is further supplied in accordance with the closing of the second pressure regulating valve and the opening of the second auxiliary supply valve. Electronic brake system.
11. In paragraph 8, The above control circuit is, Based on receiving a braking request via the brake pedal while the above hydraulic pressure supply device is inoperable, the second pressure regulating valve is opened, the second auxiliary supply valve is closed, and the motor is controlled to stop the operation of the second pump. Electronic brake system.
12. In Paragraph 11, As the second pressure regulating valve is in an open state and the second auxiliary supply valve is in a closed state, the pressurized medium discharged from the second wheel cylinder is temporarily stored in the second accumulator. Electronic brake system.
13. In Paragraph 7, The integrated master cylinder further comprises a first master piston displaceably provided by the operation of a brake pedal, a first master chamber whose volume is varied by the displacement of the first master piston, a second master piston displaceably provided by the displacement of the first master piston or the hydraulic pressure of the first master chamber, and a second master chamber whose volume is varied by the displacement of the second master piston. The above-mentioned first connecting path is, Connecting the first master chamber and the first wheel cylinder, The above second connecting path is, Connecting the second master chamber and the second wheel cylinder, Electronic brake system.
14. In Paragraph 13, reservoir, A first reservoir flow path connecting the first master chamber and the reservoir, and A second reservoir passage further comprising connecting the second master chamber and the reservoir, Electronic brake system.
15. In paragraph 1, The first pressure regulating valve is provided in the first connecting path, and The second pressure regulating valve is provided in the second connecting path, Electronic brake system.
16. A method for controlling an electronic brake system comprising: a hydraulic pressure supply device for generating hydraulic pressure of a pressurized medium; a hydraulic control unit provided between the hydraulic pressure supply device and a plurality of wheel cylinders for transmitting the hydraulic pressure generated by the hydraulic pressure supply device to the plurality of wheel cylinders; a first accumulator for temporarily storing a pressurized medium discharged from a first wheel cylinder among the plurality of wheel cylinders; a first auxiliary supply path connected to the hydraulic control unit and the first wheel cylinder and connected to the first accumulator; a first pump for pressurizing the pressurized medium supplied through the first auxiliary supply path; a motor for operating the first pump; a first auxiliary path for transmitting the pressurized medium pressurized by the first pump to the first wheel cylinder; a first auxiliary supply valve provided in the first auxiliary supply path for controlling the supply of the pressurized medium to the first pump; and a first pressure regulating valve for regulating the pressure of the first auxiliary path. Receiving a braking request from an external controller during the inability to operate the above hydraulic pressure supply device, Based on the above braking request, the method comprises controlling the motor to close the first pressure regulating valve, open the first auxiliary supply valve, and operate the first pump. Control method of an electronic brake system.
17. In Paragraph 16, A pressurized medium stored in the first accumulator is supplied to the first pump in accordance with the closing of the first pressure regulating valve and the opening of the first auxiliary supply valve. Control method of an electronic brake system.
18. In Paragraph 16, The above electronic brake system is, A second accumulator that temporarily stores a pressurized medium discharged from a second wheel cylinder among the plurality of wheel cylinders; a second auxiliary supply path connected to a first accumulator and connected to a second connecting path connecting the hydraulic control unit and the second wheel cylinder; a second pump that pressurizes the pressurized medium supplied through the second auxiliary supply path; a second auxiliary path that delivers the pressurized medium pressurized by the second pump to the second wheel cylinder; a second auxiliary supply valve provided in the second auxiliary supply path to control the supply of the pressurized medium to the second pump; and a second pressure regulating valve that regulates the pressure of the second auxiliary path. Control method of an electronic brake system.
19. In Paragraph 18, Based on the above braking request, further comprising controlling the motor to close the second pressure regulating valve, open the second auxiliary supply valve, and operate the second pump. Control method of an electronic brake system.
20. In Paragraph 18, As the first pressure regulating valve is in an open state and the first auxiliary supply valve is in a closed state, the pressurized medium discharged from the first wheel cylinder is temporarily stored in the first accumulator, and As the second pressure regulating valve is in an open state and the second auxiliary supply valve is in a closed state, the pressurized medium discharged from the second wheel cylinder is temporarily stored in the second accumulator. Control method of an electronic brake system.

Description

ELECTRIC BRAKE SYSTEM AND CONTROLLING METHOD THEREOF The disclosed invention relates to an electronic brake system and a method for controlling the same. Vehicles are equipped with a braking system to perform braking, and various types of braking systems are being proposed for the safety of drivers and passengers. Conventional braking systems primarily utilized a method in which the driver pressed the brake pedal, using a mechanically connected booster to supply the hydraulic pressure required for braking to the wheel cylinders. However, with the increasing market demand for implementing various braking functions in precise response to vehicle operating environments, electronic brake systems are becoming widely adopted. These systems receive the driver's braking intent as an electrical signal from a pedal displacement sensor that detects the pedal's displacement when pressed, and based on this, activate a hydraulic pressure supply device to provide the necessary hydraulic pressure to the wheel cylinders. Such an electronic brake system receives an electrical signal indicating braking judgment from the driver's operation of the brake pedal or during autonomous driving, and based on this, the hydraulic pressure supply device is electrically operated and controlled to generate the hydraulic pressure required for braking and transmit it to the wheel cylinder. Such electronic brake systems and their control methods are electrically operated and controlled, enabling the implementation of complex and diverse braking actions. However, if technical problems occur in the electrical components, the hydraulic pressure required for braking may not be stably formed, potentially endangering the safety of vehicle occupants. Therefore, when an electronic brake system fails or becomes uncontrollable, it enters an abnormal operation mode, and in this case, a mechanism is required in which the driver's brake pedal operation is directly linked to the wheel cylinder. In addition, a method is required to ensure stable braking of the vehicle even after the electronic brake system enters an abnormal operation mode and before the driver operates the brake pedal. In addition, a method is required to perform active braking, such as an Anti-lock Brake System (ABS) mode, so that stable braking and stable vehicle behavior can be achieved even in abnormal operation modes of the electronic brake system. FIG. 1 is a hydraulic circuit diagram showing an electronic brake system according to one embodiment. FIG. 2 is a block diagram showing the configuration of a control circuit of an electronic brake system according to one embodiment. FIG. 3 is a flowchart of the control operation of an electronic brake system according to one embodiment. Throughout the specification, the same reference numerals refer to the same components. This specification does not describe all elements of the embodiments, and general content in the art to which the disclosed invention pertains or content that overlaps between embodiments is omitted. The terms 'part, module, component, block' used in the specification may be implemented in software or hardware, and depending on the embodiments, a plurality of 'parts, modules, components, blocks' may be implemented as a single component, or a single 'part, module, component, block' may include a plurality of components. Throughout the specification, when a part is described as being 'connected' to another part, this includes not only cases where they are directly connected but also cases where they are indirectly connected, and indirect connections include connections made via a wireless communication network. Furthermore, when it is stated that a part 'includes' a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Throughout the specification, when it is stated that a component is located 'on' another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. Terms such as "first," "second," etc., are used to distinguish one component from another, and the components are not limited by the aforementioned terms. Singular expressions include plural expressions unless there is an obvious exception in the context. In each step, identification codes are used for convenience of explanation and do not describe the order of the steps; the steps may be performed differently from the specified order unless a specific order is clearly indicated in the context. The operating principle and embodiments of the disclosed invention will be described below with reference to the attached drawings. FIG. 1 is a hydraulic circuit diagram showing an electronic brake system according to one embodiment. Referring to FIG. 1, the electronic brake system (1000) may include a main brake module (also called an Integrated Dynamic Brake (IDB) mod