Brake Disc Temperature-Based Force Distribution in EV Braking
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Solution Overview
Problem
The braking performance, reliability, and service life of electric vehicle brake discs are compromised when operating at extreme temperatures, leading to reduced friction coefficients and potential braking failures.
Innovation Solution
A braking system with a controller and actuators that adjust braking force output based on brake disc temperature, increasing force for low temperatures and reducing force for high temperatures to maintain optimal friction and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction braking is applied to provide braking force, then braking performance is improved, but brake disc temperature increases leading to reduced reliability and service life
Solution Approach 1:
The control apparatus continuously monitors brake disc temperature and adjusts braking force distribution in real-time based on temperature feedback. When temperature exceeds thresholds, the system automatically reduces braking force on affected discs and redistributes it to cooler discs, creating a closed-loop control system that prevents overheating while maintaining braking performance
Solution Approach 2:
The system dynamically adjusts braking force distribution among four brake discs based on their individual temperature states. By making braking force a dynamic variable that changes with temperature conditions, the system optimizes both braking performance and thermal management throughout the braking process
2Force
If braking force is increased to improve stopping capability, then braking performance is improved, but brake disc temperature rises too high causing friction coefficient reduction
Solution Approach 1:
The system changes the operating parameters of brake discs by adjusting braking force based on temperature thresholds. When temperature exceeds the second threshold, braking force is reduced to prevent excessive heat generation. This parameter adjustment ensures brake discs operate within optimal temperature ranges where friction coefficients remain high and stable
3Force
If braking force is increased for cold brake discs to improve braking performance, then braking force output is improved, but brake disc temperature may rise too rapidly causing thermal stress
Solution Approach 1:
The control apparatus performs preliminary temperature assessment before applying full braking force. By checking brake disc temperature in advance and adjusting braking force accordingly, the system prevents sudden thermal shocks to cold brake discs while still achieving effective braking performance
4Reliability
If temperature-based braking force adjustment is implemented, then reliability and service life are improved, but control system complexity increases
Solution Approach 1:
The control system is segmented into independent temperature monitoring and braking force control modules. Each brake disc has its temperature monitored independently, and braking force is adjusted on a per-disc basis. This modular segmentation simplifies the overall control architecture while achieving reliable temperature-based braking management
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 stabilizes the vehicle's braking performance, extends the service life of brake discs, and ensures reliable braking by maintaining a higher friction coefficient across varying temperature conditions.
Implementation Method 1
The friction braking means that a braking system of the electric vehicle directly outputs braking force
Implementation Method 2
the feedback braking means that a drive motor of the electric vehicle is in a power generation state and outputs braking force
Data Source
AI summary
This application provides a braking system, a control apparatus, and an electric vehicle. The braking system includes a controller and four actuators. Each actuator includes a brake disc. The braking system is configured to adjust, based on temperatures of four brake discs, braking force output by the four actuators. The controller is configured to control an actuator corresponding to a brake disc with a too high temperature to reduce braking force output, or is configured to control an actuator corresponding to a brake disc with a too low temperature to increase braking force output.