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KR-20260066439-A - Electric Brake System And Control Method Therefor

KR20260066439AKR 20260066439 AKR20260066439 AKR 20260066439AKR-20260066439-A

Abstract

An electric brake system for a vehicle is disclosed. According to one embodiment of the present disclosure, an electric brake system for a vehicle comprises: a braking force generating unit including a brake pad configured to move toward a wheel disc or in the opposite direction toward the wheel disc by means of a piston when a motor is driven, and a caliper disposed on one side of the brake pad; a sensor unit for sensing the state of the vehicle; and a processor configured to adjust an air gap based on a signal from the sensor unit, wherein the air gap is a gap between the brake pad and the wheel disc when not braking.

Inventors

  • 김종성

Assignees

  • 현대모비스 주식회사

Dates

Publication Date
20260512
Application Date
20241104

Claims (10)

  1. In an electric brake system for a vehicle, A braking force generating unit comprising a brake pad configured to move toward the wheel disc side or in the opposite direction to the wheel disc side by means of a piston when the motor is driven, and a caliper disposed on one side of the brake pad; A sensor unit for sensing the state of the above vehicle; and It includes a processor configured to adjust the air gap based on the signal from the sensor unit above, and The above air gap is, An electric brake system, which is the gap between the brake pad and the wheel disc when not braking.
  2. In Article 1, The above-mentioned air gap further includes a user interface for manually adjusting the air gap, The above processor is, An electric brake system that adjusts the air gap based on a signal from the above user interface.
  3. In Article 2, The above processor is, An electric brake system configured to adjust the air gap according to the input mode when a user performs an input action of selecting one of a plurality of modes using the user interface.
  4. In Article 1, The above processor is, An electric brake system configured to adjust the air gap based on at least one of the speed of the vehicle detected using the sensor unit, the temperature of the braking force generating unit, whether the braking force generating unit performs braking, and whether raindrops are present.
  5. In Paragraph 4, The above processor is, An electric brake system that performs control to adjust the size of the air gap to be smaller as the speed of the vehicle increases.
  6. In Paragraph 4, The above processor is, An electric brake system that performs control to increase the size of the air gap as the temperature of the braking force generating part increases.
  7. In Paragraph 4, When the above braking force generating unit performs the braking, the processor, An electric brake system that adjusts the size of the air gap before the threshold time elapses from the point at which the braking is terminated to be larger than the size of the air gap after the threshold time elapses from the point at which the braking is terminated.
  8. In Paragraph 4, When the above braking force generating unit performs the braking, the processor, An electric brake system that adjusts the size of the air gap when the rotational speed of the wheel of the vehicle is below a critical rotational speed after the braking is terminated to be larger than the size of the air gap when the rotational speed of the wheel of the vehicle exceeds the critical rotational speed after the termination.
  9. In Paragraph 4, The above processor is, An electric brake system that adjusts the size of the air gap when the raindrop is present to be smaller than the size of the air gap when the raindrop is not present.
  10. A control method for an electric brake system comprising a braking force generating unit including a brake pad and a wheel disc and a sensor unit for sensing the state of a vehicle, A first process for adjusting the air gap, which is the gap between the brake pad and the wheel disc, based on the signal of the sensor unit, is included. The above first process is, A control method for an electric brake system, wherein the air gap is adjusted based on at least one of the speed of the vehicle detected using the sensor unit, the temperature of the braking force generating unit, whether the braking force generating unit performs braking, and whether raindrops are present.

Description

Electric Brake System and Control Method Therefor The present disclosure relates to an electric brake system and a method for controlling the same. The content described in this section merely provides background information regarding the present disclosure and does not constitute prior art. An electro-mechanical brake (EMB) is a braking apparatus that generates friction brake force. In an electro-mechanical brake, an actuator driven by a motor is mounted on the brake caliper. The electro-mechanical brake applies pressure to the wheel disk using a motor, gearbox, screw, piston, brake pad, etc., without the medium of brake fluid. Electric brakes have a mechanism similar to the Electronic Parking Brake (EPB), but because they are the main braking system used while driving, they require higher reliability and durability. When the driver presses the pedal, the electric brake calculates the required braking force and applies a brake command to each wheel. When the brake command is applied, the motor starts to rotate and advances the piston, and the piston presses the brake pad. The brake pad presses the wheel disc, generating braking force. For fast response speeds in generating braking force and high braking responsiveness, it is advantageous to have a smaller air gap—the distance between the brake pad and the wheel disc when not braking. However, controlling the system to maintain a small air gap increases the likelihood of drag during non-braking and raises concerns about a relative decrease in fuel efficiency (or electric efficiency). In other words, there is a trade-off relationship between braking responsiveness and fuel/electric efficiency. In the case of conventional hydraulic brakes, active control of the piston is impossible, and independent braking force control for each wheel is not possible. In contrast, electric brakes allow for active control of the piston and independent braking force control for each wheel. In other words, electric brakes can adjust the air gap differently during non-braking depending on whether braking responsiveness or fuel/energy efficiency is prioritized. A control method for an electric brake is required that can achieve improved fuel efficiency and braking performance by utilizing the characteristics of the electric brake to variably adjust the air gap during non-braking according to the vehicle's condition and driving situation. FIG. 1 is a functional block diagram of an electric brake system according to one embodiment of the present disclosure. FIG. 2 is a drawing illustrating a braking force generating unit according to one embodiment of the present disclosure. FIGS. 3 and 4 are graphs illustrating the relationship between an air gap and the speed of a vehicle according to one embodiment of the present disclosure. FIG. 5 is a flowchart illustrating a control method of an electric brake system according to one embodiment of the present disclosure. Some embodiments of the present disclosure are described in detail below with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions could obscure the essence of the present disclosure, such detailed description is omitted. In describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that one component is 'connected', 'combined', or 'joined' to another component, it should be understood that while the component may be directly connected or joined to the other component, another component may also be 'connected', 'combined', or 'joined' between each component. Throughout the specification, when a part is described as 'including' or 'equipped' with a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Terms such as '??… part', 'module', etc., as described in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. It should be noted that, unless otherwise stated, the description of any one embodiment may also apply to other embodiments. The description of the invention disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the invention and is not intended to represent the only embodiment in which the invention may be practiced. FIG. 1 is a functional block diagram of an electric brake system according