Brake Temperature-Based Speed Limiting to Prevent Brake Fade
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Solution Overview
Problem
Existing vehicle brake systems face issues with overheating and brake fade due to excessive heat buildup, leading to reduced friction and potential irreversible damage, especially during prolonged or high-speed braking, without accurate sensor-based understanding of brake capability.
Innovation Solution
A method and system for controlling vehicle speed based on brake temperature estimation, using a thermal model to determine a thermal margin and set speed limits to prevent brake overheating, incorporating vehicle and road conditions to adjust torque and speed limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels at high speed and/or for a long period of time, then productivity is improved, but the brake temperature increases leading to brake fade or permanent damage
Solution Approach 1:
The system performs preliminary estimation of brake temperature and proactively determines speed limits before the brakes actually overheat. By predicting the thermal state based on operating conditions and vehicle dynamics, the system prevents brake fade and damage by limiting speed in advance, rather than reacting after temperature problems occur.
Solution Approach 2:
The system continuously monitors vehicle operating conditions (speed, acceleration, brake usage) and uses this feedback to dynamically estimate brake temperature and adjust speed limits. This closed-loop approach allows the system to adapt to changing thermal conditions and maintain safe operating parameters throughout vehicle operation.
2Measurement precision
If explicit temperature sensors are installed to monitor brake temperature, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of directly measuring brake temperature with sensors, the system uses an intermediary approach by estimating temperature through a thermal model that processes readily available vehicle data (speed, acceleration, brake pressure). This intermediary estimation method provides sufficient temperature information without requiring direct thermal contact or complex sensor arrays.
Solution Approach 2:
The system replaces the mechanical/physical sensor-based temperature measurement approach with a computational estimation approach. By using vehicle dynamics data and thermal models to calculate brake temperature, the system substitutes physical sensing with mathematical modeling, reducing hardware complexity while maintaining functional capability.
3Productivity
If speed is not limited to prevent brake overheating, then productivity is maintained, but reliability decreases due to brake fade or damage
Solution Approach 1:
The system dynamically adjusts speed limits based on real-time estimation of brake thermal state rather than using fixed speed restrictions. As brake temperature changes during operation, the system continuously updates the appropriate speed limit, allowing maximum productivity when brakes are cool and implementing restrictions only when thermal conditions require them, thus maintaining reliability while optimizing performance.
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
Effectively manages brake temperature to prevent fade and damage by limiting speed and torque, ensuring safe braking performance and reducing the risk of hazardous situations.
Implementation Method 1
A vehicle brake slows down a vehicle by friction between the brake pads and a rotor of the vehicle. While braking, kinetic energy is converted into thermal energy
Data Source
AI summary
A speed-controlling process limits the speed of a vehicle to make sure brakes can slow down the vehicle without overheating. The speed-controlling process includes estimating a current temperature of at least one brake. The speed-controlling process then calculates a speed limit of the vehicle, for example at which the brake would not exceed a maximum temperature when applied to slow down the vehicle to a stop. The speed-controlling process can limit the vehicle at or below the speed limit by setting a motor torque limit.