Automatic Speed Control for Brake Fading Prevention
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Solution Overview
Problem
Conventional vehicle brake systems face issues with unwanted loss of braking force due to increased temperature, known as fading, which requires overdimensioning and increased weight, leading to higher energy consumption and emissions.
Innovation Solution
An automatic speed control system that estimates and adjusts maximum speed and acceleration based on brake component temperatures and driving variables to prevent fading, eliminating the need for conventional remedial measures and overdimensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake system is overdimensioned to prevent fading, then the braking reliability is improved, but the vehicle weight increases
Solution Approach 1:
The control system performs preliminary actions by monitoring driving conditions and brake temperature trends before fading occurs. It proactively adjusts speed and acceleration commands to prevent excessive temperature rise, thereby maintaining braking reliability without requiring an oversized brake system.
Solution Approach 2:
The system implements feedback control by continuously monitoring brake temperature and driving conditions, then adjusting speed and acceleration commands based on this feedback. This closed-loop control ensures braking reliability is maintained dynamically without the need for permanent overdimensioning of the brake system.
2Reliability
If the brake system is overdimensioned to prevent fading, then the braking reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The control system performs preliminary actions by monitoring driving conditions and brake temperature trends before fading occurs. It proactively adjusts speed and acceleration commands to prevent excessive temperature rise, thereby maintaining braking reliability without requiring an oversized brake system, which reduces manufacturing costs.
Solution Approach 2:
The system implements feedback control by continuously monitoring brake temperature and driving conditions, then adjusting speed and acceleration commands based on this feedback. This closed-loop control ensures braking reliability is maintained dynamically without the need for permanent overdimensioning of the brake system, reducing manufacturing costs.
3Reliability
If the brake system is designed with massive components to prevent fading, then the braking reliability is improved, but the energy consumption increases
Solution Approach 1:
The control system performs preliminary actions by monitoring driving conditions and brake temperature trends before fading occurs. It proactively adjusts speed and acceleration commands to prevent excessive temperature rise, thereby maintaining braking reliability without requiring massive brake components, which reduces vehicle energy consumption.
4Reliability
If the brake system is designed with massive components to prevent fading, then the braking reliability is improved, but the pollutant emission increases
Solution Approach 1:
The control system performs preliminary actions by monitoring driving conditions and brake temperature trends before fading occurs. It proactively adjusts speed and acceleration commands to prevent excessive temperature rise, thereby maintaining braking reliability without requiring massive brake components, which reduces pollutant emission.
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 counters fading by reducing maximum speed and acceleration when overheating risks are detected, reducing the need for heavy brake systems, saving costs, and lowering energy consumption and emissions.
Implementation Method 1
the electronics system is designed to estimate, on the basis of at least one temperature model, at least one temperature of at least one brake disk and/or of at least one brake drum as the at least one component
Implementation Method 2
an increased temperature of the at least one brake disk and/or of at least one brake drum may result in an unwanted loss of the braking force of the at least one wheel brake caliper
Data Source
AI summary
An automatic speed control including repeated autonomous establishment of a setpoint variable regarding a setpoint speed and/or a setpoint acceleration of the vehicle in such a way that the setpoint speed is smaller or equal to a specified or established maximum speed and/or the setpoint acceleration of the vehicle remains smaller or equal to a specified or established maximum acceleration controlling at least one vehicle component by taking into account the autonomously newly established setpoint variable so that an actual speed of the vehicle corresponds to the setpoint speed and/or an actual acceleration of the vehicle corresponds to the setpoint acceleration; and establishing the maximum speed and/or the maximum acceleration by taking into account a measured and/or estimated temperature of a component of a wheel brake caliper and/or a driving variable that is relevant for overheating of the component of the wheel brake caliper.