Electro-Mechanical Brake Control for Rear Wheel Lock Prevention
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Solution Overview
Problem
The existing electro-mechanical brake systems in vehicles often experience a wheel lock phenomenon, where the rear wheels lock before the front wheels during braking, leading to unstable vehicle posture and potential dangerous situations.
Innovation Solution
A control method and apparatus that differentially control the operation response of the front and rear wheel electro-mechanical brakes by adjusting the actual demand value based on a pedal signal, ensuring the rear wheel's response is slower than the front wheel's to prevent premature wheel lock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rear wheel electro-mechanical brake response is made faster, then braking efficiency is improved, but wheel lock phenomenon occurs at the rear wheel before the front wheel causing vehicle instability
Solution Approach 1:
The patent applies different response characteristics to different wheels by separately controlling front and rear wheel electro-mechanical brakes. The rear wheel brake response is deliberately made slower than the front wheel brake response, creating local differentiation in braking characteristics to prevent rear wheel lockup and maintain vehicle stability.
Solution Approach 2:
The patent dynamically adjusts the braking force distribution between front and rear wheels based on real-time vehicle state. By making the rear wheel brake response slower and more gradual, the system adapts the braking characteristics to prevent wheel lock while maintaining overall braking effectiveness and vehicle stability.
2Speed
If the motor performance of the rear wheel electro-mechanical brake is increased, then brake response is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the operational parameters of the electro-mechanical brake system by adjusting the response characteristics rather than increasing motor performance. The control system modifies the braking force application rate and response timing to achieve the desired effect without requiring more powerful motors, thereby avoiding increased device complexity and cost.
3Speed
If hydraulic pressure rise speed is delayed using differential orifice design, then rear wheel response becomes slower, but braking efficiency is reduced
Solution Approach 1:
The patent replaces the hydraulic pressure-based response control mechanism with an electro-mechanical control system. Instead of using differential orifice design in hydraulic circuits, the system uses motor-driven actuators with electronically controlled response characteristics, eliminating the need for complex hydraulic timing mechanisms while maintaining braking efficiency.
Data Source
AI summary
A braking apparatus for a vehicle and control method thereof is disclosed herein. According to an embodiment of the present disclosure, a control apparatus for a vehicle is provided, the apparatus comprising: an electronic control unit which calculates a target demand value based on a pedal signal, determines whether the target demand value and an actual demand value are the same as a preset value, and controls to increase or decrease the actual demand value; a front wheel control unit which receives the actual demand value from the electronic control unit and controls braking of a front wheel electro-mechanical brake; and a rear wheel control unit which receives the actual demand value from the electronic control unit and controls braking of a rear wheel electro-mechanical brake.