Electronic Brake ABS Control via Wheel Slip-Linked Motor Positioning
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Solution Overview
Problem
Conventional motor position control methods for electronic brakes in Anti-lock Brake Systems (ABS) struggle to maintain optimal wheel slip values due to limitations in the speed of brake pad movement, leading to suboptimal ABS control performance and increased stopping distances.
Innovation Solution
The method involves sensing wheel speed, calculating wheel slip values, and using linear interpolation to determine a target position for the electric motor, ensuring the brake pad position is linked with changes in wheel speed during re-braking, thereby improving motor position control and brake force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the movement speed of brake pads is increased to improve ABS control responsiveness, then the ABS control responding performance is improved, but the brake force decreases because brake force is inversely proportional to movement speed
Solution Approach 1:
The patent applies dynamics by making the brake pad movement speed variable rather than constant. The control unit adjusts the movement speed of the brake pads based on real-time wheel speed changes and calculated wheel slip values. During different phases of ABS braking (braking section, braking-release section, re-braking section), the system dynamically modifies the actuator's operating parameters to optimize both responsiveness and brake force application, resolving the contradiction between speed and force
2Speed
If the position control of electric motor is made faster to match wheel speed changes, then the ABS control responding performance is improved, but the complexity of the control system increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring wheel speed via sensors, calculating wheel slip values, and using this information to adjust the electric motor position in real-time. The control unit receives feedback about actual wheel conditions and modifies the brake pad position accordingly, enabling fast and accurate response without requiring overly complex open-loop control systems. The feedback loop closes the gap between desired and actual brake force application
Solution Approach 2:
The system performs preliminary calculations of target position values for the electric motor based on predicted wheel slip conditions. By pre-calculating appropriate brake pad positions for anticipated wheel speed changes, the system prepares control actions in advance, reducing the computational burden during critical braking moments and enabling faster response times without proportionally increasing control system complexity
Data Source
AI summary
Disclosed herein is a method of controlling an Anti-lock Brake system (ABS) of an electronic brake, which is driven using an electric motor. In ABS braking in which braking and braking-release motions are repeated according to a wheel slip value, the electric motor is controlled in a re-braking section to link a position of a brake pad with a change in wheel speed, to enhance ABS control responsiveness and to reduce stopping distance with maximized brake force.