Electromechanical Brake Torque Redistribution After Wheel Brake Failure
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Solution Overview
Problem
Electromechanical brake systems on vehicles malfunction when one brake fails, causing the vehicle to be pulled to one side and compromising normal braking or leading to accidents.
Innovation Solution
An electromechanical brake system with sensors and a controller that estimate normalcy of brakes and distribute braking torques based on vehicle speed, lateral acceleration, and driver input to maintain stable braking even if one brake malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electromechanical brakes are mounted individually on four wheels for independent braking control, then braking response speed and control precision are improved, but system reliability deteriorates when one brake malfunctions causing vehicle instability
Solution Approach 1:
The controller continuously monitors the operational status of each electromechanical brake through sensor signals and adjusts braking torque distribution in real-time. When a malfunction is detected, the system provides feedback to redistribute braking forces among functioning brakes, maintaining vehicle stability despite individual brake failures
Solution Approach 2:
The braking torque distribution is made dynamic and adaptable based on real-time brake status. The controller dynamically adjusts the braking torque applied to each wheel according to the operational condition of individual brakes and vehicle motion state, transitioning from fixed individual braking to flexible distributed braking when malfunctions occur
2Reliability
If braking torque is distributed among remaining functional brakes when one brake malfunctions, then braking stability is maintained, but control complexity increases
Solution Approach 1:
The controller is designed with multi-functionality, serving both as the primary braking control unit during normal operation and as a malfunction detection and compensation system when brakes fail. This universal design avoids adding separate dedicated systems for malfunction handling, thereby limiting complexity increase
Solution Approach 2:
The braking system performs self-diagnosis and self-correction by automatically detecting brake malfunctions through sensor signals and autonomously redistributing braking torque among functional brakes without requiring external intervention or complex additional control mechanisms
Data Source
AI summary
Disclosed herein are an electromechanical brake system and a control method thereof. In accordance with one aspect of the present disclosure, there is provided an electromechanical brake system including electromechanical brakes respectively provided on four wheels of a vehicle, a sensor part that outputs a signal which corresponds to or is capable of estimating whether each of the electromechanical brakes is normal and a driver demand braking torque generated based on the speed and lateral acceleration of the vehicle and a brake pedal operation of a driver, and a controller that estimates a demand braking torque based on the signal received from the sensor part and determines whether the electromechanical brakes are normal, wherein the controller performs a braking control as much as the demand braking torque based on the determination that the electromechanical brakes are normal, and performs a braking control by distributing, within a range of the demand braking torque, braking torques based on the lateral acceleration of the vehicle to the respective other electromechanical brakes except the electromechanical brake determined to malfunction based on the determination that there is a malfunction of any one among the electromechanical brakes.