KR-20260063331-A - ELECTRIC BRAKE SYSTEM AND CONTROLLING METHOD THEREOF

KR20260063331AKR 20260063331 AKR20260063331 AKR 20260063331AKR-20260063331-A

Abstract

An electronic brake system comprises: a hydraulic control unit positioned between a hydraulic pressure supply device that generates hydraulic pressure of a pressurized medium and a plurality of wheel cylinders, and which transmits the hydraulic pressure generated by the hydraulic pressure supply device to the plurality of wheel cylinders; a pressure sensor that detects the pressure of the hydraulic control unit; an auxiliary brake module comprising a first pump that pressurizes the pressurized medium and discharges it to a first wheel cylinder among the plurality of wheel cylinders, a motor that drives the first pump, and a first auxiliary supply valve that controls the supply of the pressurized medium to the first pump; and a control circuit electrically connected to the hydraulic control unit, the pressure sensor, and the auxiliary brake module, wherein the control circuit controls the hydraulic control unit so that a fluid path connecting the hydraulic control unit to the hydraulic pressure supply device, wheel cylinders other than the first wheel cylinder among the plurality of wheel cylinders, and an integrated master cylinder is blocked, controls the motor to drive while the fluid path is blocked, and diagnoses the state of at least one of the first pump, the motor, or the first auxiliary supply valve based on monitoring of the pressure obtained during the driving control of the motor.

Inventors

김연성
강기원
전인욱

Assignees

에이치엘만도 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (20)

A hydraulic control unit provided between a hydraulic pressure supply device that generates hydraulic pressure of a pressurized medium and a plurality of wheel cylinders, and which transmits the hydraulic pressure generated by the hydraulic pressure supply device to the plurality of wheel cylinders; A pressure sensor that detects the pressure of the above hydraulic control unit; An auxiliary brake module comprising a first pump that pressurizes the pressurizing medium and discharges it to a first wheel cylinder among the plurality of wheel cylinders, a motor that drives the first pump, and a first auxiliary supply valve that controls the supply of the pressurizing medium to the first pump; and It includes a control circuit electrically connected to the above hydraulic control unit, the above pressure sensor, and the above auxiliary brake module, and The above control circuit is, Control the hydraulic control unit so that the fluid path connecting the hydraulic supply device, the wheel cylinders other than the first wheel cylinder among the plurality of wheel cylinders, and the master cylinder for integration is blocked from the hydraulic control unit, and Driving control of the motor in the blocked state of the above Euro, and Diagnosing the state of at least one of the first pump, the motor, or the first auxiliary supply valve based on monitoring of the pressure obtained during the drive control of the motor, Electronic brake system.
In paragraph 1, The above control circuit is, Based on the blockage of the above Euro and the closed state of the above first auxiliary supply valve, the motor is first driven and controlled, During the first drive control of the above motor, the state of the first auxiliary supply valve is diagnosed based on the monitoring of the pressure obtained through the output signal of the pressure sensor, and Based on the blockage of the above Euro and the opening state of the above first auxiliary supply valve, the motor is second-driven controlled, and During the second drive control of the motor, diagnosing the state of the first pump and the motor based on monitoring the pressure obtained through the output signal of the pressure sensor, Electronic brake system.
In paragraph 2, The above control circuit is, During the first drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the first auxiliary supply valve is in an abnormal state, and During the first drive control of the motor, if the pressure obtained through the output signal of the pressure sensor does not rise, the first auxiliary supply valve is determined to be in a normal state. Electronic brake system.
In paragraph 2, The above control circuit is, During the second drive control of the motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the first pump and the motor are in a normal state. During the second drive control of the motor, if the pressure obtained through the output signal of the pressure sensor does not rise, it is determined that at least one of the first pump or the motor is in an abnormal state. Electronic brake system.
In paragraph 1, The above auxiliary brake module is, It further includes a first auxiliary passage for delivering a pressurized medium pressurized by the first pump to the first wheel cylinder, and a first pressure regulating valve for regulating the pressure of the first auxiliary passage. The above control circuit is, Controlling the first pressure regulating valve to be in a closed or open state, Electronic brake system.
In paragraph 5, It further includes a dump valve provided in a dump path connecting the above hydraulic supply device and the reservoir to control the flow of the above pressurized medium, and The above control circuit is, After the pressure is released from the electronic brake system, the valve provided in the passage connecting the hydraulic control unit and the hydraulic pressure supply unit is controlled so that the passage connecting the hydraulic control unit and the hydraulic pressure supply unit is blocked, the dump valve is controlled to be in a closed state, and the first pressure regulating valve is controlled to be in an open state. Third drive control of the motor based on the blockage of the fluid path connecting the hydraulic control unit and the hydraulic pressure supply device, the closed state of the dump valve, and the open state of the first pressure regulating valve, and During the third drive control of the above motor, a state diagnosis of the first pressure regulating valve is performed based on monitoring the pressure obtained through the output signal of the pressure sensor. Electronic brake system.
In paragraph 6, The above control circuit is, During the third drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the first pressure regulating valve is in an abnormal state, and During the third drive control of the motor, if the pressure obtained through the output signal of the pressure sensor does not rise, the first pressure regulating valve is determined to be in a normal state. Electronic brake system.
In paragraph 6, The above control circuit is, To release pressure in the above electronic brake system, the motor is controlled to become inactive, the first auxiliary supply valve is controlled to become open, the valve provided in the fluid path connecting the hydraulic control unit and the hydraulic supply device is controlled so that the fluid path connecting the hydraulic control unit and the hydraulic supply device is in communication, and the dump valve is controlled to become open. Electronic brake system.
In paragraph 1, The above auxiliary brake module is, It further includes a second pump that pressurizes the pressurizing medium based on the driving of the motor and discharges it to a second wheel cylinder among the plurality of wheel cylinders, and a second auxiliary supply valve that controls the supply of the pressurizing medium to the second pump. The above control circuit is, The hydraulic control unit is connected to the connecting passage connecting the second wheel cylinder from the integrated master cylinder, and the hydraulic control unit is controlled such that the passage connecting the wheel cylinder other than the second wheel cylinder to the hydraulic control unit is blocked. Control the cut valve so that the cut valve provided in the above-mentioned connecting path becomes closed, and The hydraulic control unit is connected to the connecting passage connecting the second wheel cylinder from the integrated master cylinder, and the motor is driven and controlled in the closed state of the passage connecting the wheel cylinder other than the second wheel cylinder and the hydraulic control unit and the cut valve. A hydraulic control unit is connected to a connecting passage connecting the second wheel cylinder from the integrated master cylinder, and in the closed state of the passage connecting the wheel cylinder other than the second wheel cylinder to the hydraulic control unit and the cut valve, during the driving control of the motor, the state of at least one of the second pump, the motor, or the second auxiliary supply valve is diagnosed based on monitoring of the pressure obtained through the output signal of the pressure sensor. Electronic brake system.
In Paragraph 9, The above control circuit is, The hydraulic control unit is connected to the connecting passage connecting the second wheel cylinder from the integrated master cylinder, and the motor is driven by a fourth drive control based on the blocking of the passage connecting the wheel cylinder other than the second wheel cylinder and the hydraulic control unit, the closed state of the cut valve, and the closed state of the second auxiliary supply valve. During the fourth drive control of the above motor, the state of the second auxiliary supply valve is diagnosed based on the monitoring of the pressure obtained through the output signal of the pressure sensor, and The hydraulic control unit is connected to the connecting passage connecting the second wheel cylinder from the integrated master cylinder, and the motor is driven by the fifth drive based on the blocking of the passage connecting the wheel cylinder other than the second wheel cylinder and the hydraulic control unit, the closed state of the cut valve, and the open state of the second auxiliary supply valve. Diagnosing the state of the second pump and the motor based on monitoring the pressure obtained through the output signal of the pressure sensor during the fifth drive control of the motor. Electronic brake system.
In Paragraph 10, The above control circuit is, During the fourth drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the second auxiliary supply valve is in an abnormal state, and During the fourth drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor does not rise, the second auxiliary supply valve is determined to be in a normal state. Electronic brake system.
In Paragraph 10, The above control circuit is, During the fifth drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the second pump and the motor are in a normal state, and During the fifth drive control of the motor, if the pressure obtained through the output signal of the pressure sensor does not rise, it is determined that at least one of the second pump or the motor is in an abnormal state. Electronic brake system.
In Paragraph 9, The auxiliary brake module further includes a second auxiliary passage that transmits a pressurized medium pressurized by the second pump to the second wheel cylinder, and a second pressure regulating valve that regulates the pressure of the second auxiliary passage. The above electronic brake system further includes a dump valve provided in a dump path connecting the hydraulic supply device and the reservoir to control the flow of the pressurized medium. The above control circuit is, Controlling the second pressure regulating valve and the dump valve to be in a closed or open state, Electronic brake system.
In Paragraph 12, The above control circuit is, After the pressure is released from the electronic brake system, the first pressure regulating valve and the second pressure regulating valve are controlled to be in a closed state, and the dump valve is controlled to be in an open state. Based on the closed state of the first pressure regulating valve and the second pressure regulating valve and the open state of the dump valve, the motor is driven by the sixth driving control, and During the sixth drive control of the above motor, a state diagnosis of the second pressure regulating valve is performed based on monitoring the pressure obtained through the output signal of the pressure sensor. Electronic brake system.
In Paragraph 14, The above control circuit is, During the sixth drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor increases, it is determined that the second pressure regulating valve is in an abnormal state, and During the sixth drive control of the above motor, if the pressure obtained through the output signal of the pressure sensor does not rise, the second pressure regulating valve is determined to be in a normal state. Electronic brake system.
In Paragraph 14, The above control circuit is, To release pressure in the above electronic brake system, the motor is controlled to become inactive, the second auxiliary supply valve is controlled to become open, the valve provided in the passage connecting the hydraulic control unit and the hydraulic pressure supply device is controlled so that the passage connecting the hydraulic control unit and the hydraulic pressure supply device is in communication, the dump valve is controlled to become open, and the first pressure regulating valve and the second pressure regulating valve are controlled to become open. Electronic brake system.
A control method for an electronic brake system comprising: a hydraulic control unit disposed between a hydraulic pressure supply device that generates hydraulic pressure of a pressurized medium and a plurality of wheel cylinders, and which transmits the hydraulic pressure generated by the hydraulic pressure supply device to the plurality of wheel cylinders; a pressure sensor that detects the pressure of the hydraulic control unit; a first pump that pressurizes the pressurized medium and discharges it to a first wheel cylinder among the plurality of wheel cylinders; a motor that drives the first pump; and a first auxiliary supply valve that controls the supply of the pressurized medium to the first pump. Control the hydraulic control unit so that the fluid path connecting the hydraulic supply device, the wheel cylinders other than the first wheel cylinder among the plurality of wheel cylinders, and the master cylinder for integration is blocked from the hydraulic control unit; Driving and controlling the motor in the blocked state of the above Euro; Diagnosing the state of at least one of the first pump, the motor, or the first auxiliary supply valve based on monitoring of the pressure obtained during the drive control of the motor, Control method of an electronic brake system.
In Paragraph 17, Driving and controlling the above motor is, The motor is first driven based further on the closed state of the first auxiliary supply valve, and It includes second driving control of the motor based further on the open state of the first auxiliary supply valve, and Diagnosing the condition of at least one of the first pump, the motor, or the first auxiliary supply valve is, During the first drive control of the above motor, the state of the first auxiliary supply valve is diagnosed based on the monitoring of the pressure obtained through the output signal of the pressure sensor, and Diagnosing the state of the first pump and the motor based on monitoring the pressure obtained through the output signal of the pressure sensor during the second drive control, Control method of an electronic brake system.
In Paragraph 17, The above auxiliary brake module is, It further includes a first auxiliary passage that transmits a pressurized medium pressurized by the pump to the first wheel cylinder, and a first pressure regulating valve that regulates the pressure of the first auxiliary passage. The above electronic brake system is, A dump valve further comprising a dump path connecting the above hydraulic supply device and the reservoir to control the flow of the pressurized medium Control method of an electronic brake system.
In Paragraph 19, The above control method is, After the pressure is released from the electronic brake system, the valve provided in the passage connecting the hydraulic control unit and the hydraulic pressure supply unit is controlled so that the passage connecting the hydraulic control unit and the hydraulic pressure supply unit is blocked, the dump valve is controlled to be in a closed state, and the first pressure regulating valve is controlled to be in an open state. Third drive control of the motor based on the blockage of the fluid path connecting the hydraulic control unit and the hydraulic pressure supply device, the closed state of the dump valve, and the open state of the first pressure regulating valve, and During the third drive control of the above motor, a state diagnosis of the first pressure regulating valve is performed based on monitoring the pressure obtained through the output signal of the pressure sensor. 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 illustrating the diagnosis of a fault in an auxiliary brake module according to one embodiment. FIG. 4 is a diagram illustrating the fault diagnosis of an auxiliary brake module according to one embodiment. FIG. 5 is a flowchart of the control operation of an electronic brake system according to one embodiment. FIG. 6 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