Electro-Mechanical Brake Air Gap Adjustment for Drag-Free Response
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Solution Overview
Problem
Conventional electro-mechanical brakes face issues with drag phenomena and reduced braking responsiveness due to changes in brake pad and caliper states during vehicle operation, which existing calibration methods cannot address without causing driver discomfort or safety risks.
Innovation Solution
A control method for electro-mechanical brakes that adjusts the air gap between brake pads and wheel disks based on sensor inputs from brake, accelerator, and vehicle state, minimizing drag and maintaining responsiveness without additional calibration during travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed while traveling to update brake force data, then the brake force estimation accuracy is improved, but driver discomfort and safety risks increase due to brake heterogeneity
Solution Approach 1:
The system dynamically adjusts the air gap based on real-time vehicle state (acceleration, deceleration, load movement) rather than using a static calibration value. This allows the brake system to adapt to changing conditions during travel without requiring full calibration, maintaining accuracy while avoiding driver discomfort
Solution Approach 2:
The system changes the air gap parameter dynamically based on vehicle operating conditions (acceleration, deceleration, load position) to compensate for caliper tilt and brake pad expansion, thereby maintaining brake force estimation accuracy without performing full calibration during travel
2Object-generated harmful factors
If additional air gap is secured to prevent drag phenomenon, then drag is reduced, but braking responsiveness deteriorates due to increased distance to contact point
Solution Approach 1:
The air gap is dynamically adjusted based on real-time vehicle state rather than being fixed. During acceleration or deceleration when caliper tilt occurs, the air gap is increased to prevent drag. During normal braking, the air gap is minimized to ensure rapid responsiveness
Solution Approach 2:
The system changes the air gap parameter based on vehicle operating conditions: increasing it during acceleration/deceleration to prevent drag phenomenon, and maintaining it minimal during normal braking operations to preserve braking responsiveness
3Device complexity
If calibration is performed only when driver opens or starts door, then device complexity is reduced, but brake force estimation becomes inaccurate when brake state changes during travel
Solution Approach 1:
The system uses feedback from sensors detecting vehicle state (acceleration, deceleration, load position) to dynamically adjust the air gap in real-time, compensating for brake state changes without requiring repeated calibration processes
Solution Approach 2:
The brake system performs self-adjustment of the air gap based on detected vehicle conditions, automatically compensating for caliper tilt and brake pad expansion without requiring external calibration intervention during travel
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively minimizes drag phenomena and maintains rapid braking responsiveness by dynamically controlling the air gap, ensuring accurate brake force estimation and preventing brake pad wear-related issues.
Implementation Method 1
an actuator driven by a motor is mounted on a brake caliper... the motor starts to rotate to advance the piston
Implementation Method 2
The brake pads press the wheel disks so that the brake force is generated
Data Source
AI summary
Disclosed are an electro-mechanical brake apparatus and a control method therefor.According to an embodiment of the present disclosure, there is provided a control method of electro-mechanical brake apparatus including a piston configured to push a brake pad toward a wheel disk by driving a motor, the method including determining whether a brake pedal is depressed, when it is determined that the brake pedal is not depressed, determining whether an accelerator pedal is depressed, when it is determined that the accelerator pedal is depressed, determining whether a vehicle is stopped, when it is determined that the vehicle is not stopped, determining whether the vehicle is performing vehicle body posture control, and when it is determined that the vehicle is not performing the vehicle body posture control, controlling an air gap, wherein the air gap includes a spacing distance between the brake pad and the wheel disk.