KR-20260063332-A - ELECTRIC BRAKE SYSTEM AND CONTROLLING METHOD THEREOF

KR20260063332AKR 20260063332 AKR20260063332 AKR 20260063332AKR-20260063332-A

Abstract

An electronic brake system comprises: an integrated master cylinder that discharges a pressurized medium based on the force applied by a brake pedal; a hydraulic pressure supply device that generates hydraulic pressure of the pressurized medium based on an electrical signal from a pedal displacement sensor for the brake pedal; and an auxiliary brake module that provides hydraulic pressure to a first wheel cylinder and a second wheel cylinder among a plurality of wheel cylinders, wherein the auxiliary brake module may include a pump that pressurizes the pressurized medium, a motor that operates the pump, a first auxiliary flow path that transmits the pressurized medium pressurized by the pump to the first wheel cylinder, a first auxiliary supply flow path provided to supply the pressurized medium to the pump, a first auxiliary supply valve provided in the first auxiliary supply flow path to control the supply of the pressurized medium to the pump, and a first pressure regulating valve that regulates the pressure of the first auxiliary flow path.

Inventors

김연성
강기원
전인욱

Assignees

에이치엘만도 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (20)

An integrated master cylinder that discharges a pressurized medium based on the force applied to the brake pedal; A hydraulic pressure supply device that generates hydraulic pressure of the pressurized medium based on the electrical signal of the pedal displacement sensor for the brake pedal; 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 pump for pressurizing the pressurizing medium, a motor for operating the pump, a first auxiliary passage for delivering the pressurizing medium pressurized by the pump to the first wheel cylinder, a first auxiliary supply passage arranged to supply the pressurizing medium to the pump, a first auxiliary supply valve arranged in the first auxiliary supply passage to control the supply of the pressurizing medium to the pump, and a first pressure regulating valve for regulating the pressure of the first auxiliary passage. electronic brake system
In paragraph 1, The above auxiliary brake module is, A second auxiliary passage for delivering a pressurized medium pressurized by the pump to the second wheel cylinder, a second auxiliary supply passage arranged to supply the pressurized medium to the pump, a second auxiliary supply valve arranged in the second auxiliary supply passage to control the supply of the pressurized medium to the pump, and a second pressure regulating valve for regulating the pressure of the second auxiliary passage, further comprising Electronic brake system.
In paragraph 2, 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, closing the first pressure regulating valve and the second pressure regulating valve, opening the first auxiliary supply valve and the second auxiliary supply valve, and controlling the motor to operate the pump. Electronic brake system.
In paragraph 3, 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 and the second pressure regulating valve are opened, the first auxiliary supply valve and the second auxiliary supply valve are closed, and the motor is controlled to stop the operation of the pump. Electronic brake system.
In paragraph 3, The above control circuit is, Controlling the driving current supplied to the first pressure regulating valve and the second pressure regulating valve based on the pressure corresponding to the braking request from the external controller, Electronic brake system.
In paragraph 3, In the event of failure of the above hydraulic pressure supply device, in fallback mode, the first pressure regulating valve and the second pressure regulating valve are in an open state, and the first auxiliary supply valve and the second auxiliary supply valve are in a closed state. Electronic brake system.
In paragraph 3, The above control circuit is, When the above hydraulic pressure supply device is inoperable, in a cross-control mode of the first wheel equipped with the first wheel cylinder and the second wheel equipped with the second wheel cylinder, a first control for opening the first pressure regulating valve, closing the first auxiliary supply valve, closing the second pressure regulating valve, and opening the second auxiliary supply valve, and a second control for closing the first pressure regulating valve, opening the first auxiliary supply valve, opening the second pressure regulating valve, and closing the second auxiliary supply valve are repeated. Controlling the motor so that the pump operates during the repetition of the first control and the second control, Electronic brake system.
In paragraph 1, The above integrated master cylinder is, A first master piston displaceably provided by the operation of the 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. Electronic brake system.
In paragraph 8, reservoir, A first reservoir flow path connecting the first master chamber and the reservoir, A second reservoir flow path connecting the second master chamber and the reservoir, and A third reservoir path further comprising a third reservoir path connected to the first auxiliary supply path and the second auxiliary supply path, thereby connecting the pump and the reservoir. Electronic brake system.
In Paragraph 9, The first pressure regulating valve is provided, and a first connecting passage connecting the first wheel cylinder and the master cylinder is provided, and The above-mentioned second pressure regulating valve is provided, and further comprising a second connecting passage connecting the second wheel cylinder and the master cylinder, Electronic brake system.
A main brake module connected to a brake pedal and operated and controlled mechanically and electronically to supply hydraulic pressure of a pressurized medium to multiple wheel cylinders; An auxiliary brake module comprising: a pump for pressurizing the pressurizing medium; a motor for operating the pump; a first auxiliary flow path and a second auxiliary flow path for delivering the pressurized medium pressurized by the pump to a first wheel cylinder and a second wheel cylinder, respectively, among a plurality of wheel cylinders; a first auxiliary supply flow path and a second auxiliary supply flow path arranged to supply the pressurized medium to the pump; a first auxiliary supply valve arranged in the first auxiliary supply flow path to control the supply of the pressurized medium to the pump; a second auxiliary supply valve arranged in the second auxiliary supply flow path to control the supply of the pressurized medium to the pump; and a first pressure regulating valve and a second pressure regulating valve for regulating the pressure of the first auxiliary flow path and the second auxiliary flow path; and A control circuit comprising at least one of the first pressure regulating valve, the second pressure regulating valve, the first auxiliary supply valve, the second auxiliary supply valve, and the motor of the auxiliary brake module during the inoperability of the main brake module, Electronic brake system.
In Paragraph 11, The above control circuit is, Based on receiving a braking request from an external controller during the inability of the above hydraulic pressure supply device, closing the first pressure regulating valve and the second pressure regulating valve, opening the first auxiliary supply valve and the second auxiliary supply valve, and controlling the motor to operate the pump. Electronic brake system.
In Paragraph 12, 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 and the second pressure regulating valve are opened, the first auxiliary supply valve and the second auxiliary supply valve are closed, and the motor is controlled to stop the operation of the pump. Electronic brake system.
In Paragraph 12, The above control circuit is, Controlling the driving current supplied to the first pressure regulating valve and the second pressure regulating valve based on the pressure corresponding to the braking request from the external controller, Electronic brake system.
In Paragraph 12, In the event of failure of the above hydraulic pressure supply device, in fallback mode, the first pressure regulating valve and the second pressure regulating valve are in an open state, and the first auxiliary supply valve and the second auxiliary supply valve are in a closed state. Electronic brake system.
A control method for an electronic brake system comprising: a main brake module connected to a brake pedal and operated and controlled mechanically and electronically to supply hydraulic pressure of a pressurized medium to a plurality of wheel cylinders; a pump that pressurizes the pressurized medium; a motor that operates the pump; a first auxiliary flow path and a second auxiliary flow path that respectively transmit the pressurized medium pressurized by the pump to a first wheel cylinder and a second wheel cylinder among the plurality of wheel cylinders; a first auxiliary supply flow path and a second auxiliary supply flow path arranged to supply the pressurized medium to the pump; a first auxiliary supply valve arranged in the first auxiliary supply flow path to control the supply of the pressurized medium to the pump; a second auxiliary supply valve arranged in the second auxiliary supply flow path to control the supply of the pressurized medium to the pump; and a first pressure regulating valve and a second pressure regulating valve that regulate the pressure of the first auxiliary flow path and the second auxiliary flow path. Based on receiving a braking request from an external controller while the main brake module is inoperable, the first pressure regulating valve and the second pressure regulating valve are closed, and the first auxiliary supply valve and the second auxiliary supply valve are opened; Controlling the motor to operate the pump based on the closing of the first pressure regulating valve and the second pressure regulating valve and the opening of the first auxiliary supply valve and the second auxiliary supply valve, Control method of an electronic brake system.
In Paragraph 16, Based on receiving a braking request via a brake pedal while the above hydraulic pressure supply device is inoperable, the method further comprises opening the first pressure regulating valve and the second pressure regulating valve, closing the first auxiliary supply valve and the second auxiliary supply valve, and controlling the motor to stop the operation of the pump. Control method of an electronic brake system.
In Paragraph 16, Further comprising controlling the driving current supplied to the first pressure regulating valve and the second pressure regulating valve based on the pressure corresponding to the braking request from the external controller. Control method of an electronic brake system.
In Paragraph 16, In the event of failure of the above hydraulic pressure supply device, in fallback mode, the first pressure regulating valve and the second pressure regulating valve are in an open state, and the first auxiliary supply valve and the second auxiliary supply valve are in a closed state. Control method of an electronic brake system.
In Paragraph 16, When the above hydraulic pressure supply device is inoperable, in a cross-control mode of the first wheel equipped with the first wheel cylinder and the second wheel equipped with the second wheel cylinder, a first control for opening the first pressure regulating valve, closing the first auxiliary supply valve, closing the second pressure regulating valve, and opening the second auxiliary supply valve, and a second control for closing the first pressure regulating valve, opening the first auxiliary supply valve, opening the second pressure regulating valve, and closing the second auxiliary supply valve are repeated. Further comprising controlling the motor to operate the pump during the repetition of the first control and the second control. 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 diagram showing the supply path of a pressurized medium according to the control of an auxiliary brake module of an electronic brake system according to one embodiment. FIG. 4 is a diagram showing the supply path of a pressurized medium according to the control of an auxiliary brake module of an electronic brake system according to one embodiment. FIG. 5 is a diagram showing the discharge path and pressure release path of a pressurized medium according to the control of an auxiliary brake module of an electronic brake system according to one embodiment. FIG. 6 is a flowchart of the 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 conv