Electric Brake Piston Control for ABS Noise Reduction
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Solution Overview
Problem
Existing electric brake systems face challenges in efficiently controlling the movement direction of a piston during Anti-lock Brake System (ABS) operation, leading to suboptimal braking performance and increased mechanical noise due to frequent direction changes.
Innovation Solution
An electric brake system that includes a hydraulic feeder, a motor position sensor, and a controller which predicts piston displacement and adjusts the piston's movement direction based on vehicle speed and target positions to maintain optimal stroke values within predetermined ranges, thereby reducing unnecessary direction changes during ABS control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the piston frequently changes movement direction during ABS operation, then the braking force can be adjusted dynamically, but mechanical noise increases and stroke use efficiency decreases
Solution Approach 1:
The controller predicts the total stroke value required for the entire ABS operation duration and determines optimal direction change timing in advance. By calculating the position trajectory beforehand and planning when direction changes should occur, the system minimizes unnecessary piston movements while ensuring braking force can be adjusted when needed, thereby reducing mechanical noise without sacrificing adaptability
Solution Approach 2:
The system continuously monitors the actual piston position and compares it with the predicted position trajectory. Based on this feedback, the controller adjusts the timing and magnitude of direction changes to keep the piston within optimal stroke ranges, reducing unnecessary movements that generate mechanical noise while maintaining effective braking force control
2Speed
If the piston changes direction frequently during ABS operation, then braking control responsiveness improves, but stroke use efficiency decreases
Solution Approach 1:
The controller calculates the total stroke value required for the complete ABS operation and determines the optimal position trajectory in advance. By planning the piston movement path beforehand, the system identifies the minimum necessary direction changes to achieve the desired braking response, thereby improving stroke use efficiency while maintaining responsiveness through strategic direction changes at critical moments
Solution Approach 2:
The system dynamically adjusts the piston movement strategy based on real-time conditions. The controller modifies the position trajectory and direction change timing during operation to optimize both responsiveness and stroke efficiency, allowing the piston to change direction only when necessary for effective braking control rather than following a fixed pattern
3Device complexity
If the piston movement direction is not optimized during ABS operation, then the system structure remains simple, but braking stability deteriorates
Solution Approach 1:
The controller uses feedback from actual piston position measurements to compare with predicted trajectories and make real-time adjustments. This closed-loop control ensures the piston remains within optimal stroke ranges, maintaining braking stability without requiring complex mechanical structures, as the stability is achieved through intelligent control rather than physical design
Solution Approach 2:
The system replaces complex mechanical direction control mechanisms with an electronic control approach. Instead of using mechanical components to physically guide or constrain piston movement directions, the system uses electronic sensors and controllers to monitor and adjust piston position, achieving stable braking performance through electronic regulation rather than mechanical complexity
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
This solution enhances braking stability and reduces mechanical noise by ensuring the piston remains within optimal stroke ranges, improving stroke use efficiency and minimizing unnecessary movement during ABS operations.
Implementation Method 1
a motor position sensor configured to measure a position of the piston
Implementation Method 2
a hydraulic feeder configured to move a piston forward or backward according to a pedal effort from a brake pedal to discharge oil
Data Source
AI summary
Disclosed herein is an electric brake system including: a hydraulic feeder configured to move a piston forward or backward according to a pedal effort from a brake pedal to discharge oil; a motor position sensor configured to measure a position of the piston; and a controller configured to control, when an Anti-lock Brake System (ABS) control starts, a change in direction of the piston based on predicted displacement information of the piston while the ABS control is performed such that the piston is at a target position at target vehicle speed.