Electric Brake System Piston Stroke Control for ABS Noise Reduction
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Solution Overview
Problem
Existing electric brake systems experience significant noise, vibration, and driver unfamiliarity during anti-lock brake system (ABS) control due to large variations in wheel pressure, leading to unexpected errors between requested and actual brake pressure.
Innovation Solution
An electric brake system with a hydraulic control device, sensing unit, and controller that calculates the change in piston stroke to boost pressure at a predetermined slope, ensuring accurate brake pressure distribution across wheels, thereby reducing noise, vibration, and driver unfamiliarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wheel valves are regulated during ABS control to achieve rapid response, then control speed is improved, but large variation in wheel pressure occurs causing noise and vibration
Solution Approach 1:
The patent applies dynamics by making the piston movement speed variable rather than fixed. The controller adjusts the piston stroke change amount dynamically based on the current brake pressure state, allowing rapid pressure adjustment when needed while slowing down near the target pressure to eliminate noise and vibration. This dynamic adaptation resolves the contradiction between fast response and noise reduction.
Solution Approach 2:
The patent changes the parameter of piston stroke change amount during the ABS control process. Instead of using a fixed stroke change, the system calculates and applies different stroke change amounts at different stages: larger changes for rapid response and smaller changes near the endpoint to reduce pressure variation. This parameter adjustment strategy simultaneously achieves fast control response and minimizes noise and vibration.
2Productivity
If wheel valves are regulated during ABS control, then control response is rapid, but error between requested and actual brake pressure occurs
Solution Approach 1:
The patent implements feedback control by continuously monitoring the actual brake pressure and comparing it with the requested pressure. The controller calculates the difference and adjusts the piston stroke change amount accordingly. This feedback mechanism ensures that the system can rapidly respond while maintaining high precision by making real-time corrections based on actual pressure measurements.
Solution Approach 2:
The system dynamically adjusts the piston stroke change amount based on the current pressure state and the difference between requested and actual pressure. This dynamic adjustment allows the system to be aggressive when far from the target (rapid response) and conservative when接近 the target (high precision), resolving the contradiction between speed and accuracy.
3Speed
If piston stroke is adjusted rapidly to boost wheel pressure, then control speed is improved, but noise and vibration increase
Solution Approach 1:
The patent applies periodic action by dividing the pressure boost process into multiple stages with different piston stroke change amounts. Instead of a single large adjustment, the system performs sequential adjustments: larger strokes for initial rapid pressure buildup and smaller strokes for fine-tuning near the target pressure. This staged periodic action achieves fast overall response while minimizing noise and vibration during critical phases.
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 system effectively reduces noise and vibration, enhances stability, and improves the driver's experience by ensuring precise brake pressure control during ABS operations, stabilizing the ABS control process.
Implementation Method 1
the motor generates hydraulic pressure, the electronically controlled brake system may regulate the position of pistons connected to a hydraulic circuit
Implementation Method 2
a hydraulic circuit configured to transfer the hydraulic pressure generated by the master cylinder to at least one wheel
Data Source
AI summary
An electric brake system and a method for controlling the same are disclosed. The electric brake system includes a hydraulic control device, a sensing unit, and a controller. The hydraulic control device generates hydraulic pressure using a piston operated by an electric signal generated in response to a displacement of a brake pedal. The sensing unit detects driver's braking intention. When an electronic stability control (ESC) of a vehicle operates, the controller calculates a change amount of stroke of the piston needed to output brake pressure corresponding to the driver's braking intention, and acquires the calculated stroke change amount so as to boost pressure of each wheel at a predetermined slope.