Rail Vehicle Friction Brake Temperature Calculation
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Solution Overview
Problem
Existing methods for calculating the temperature of friction brake systems in vehicles do not accurately account for heat conduction and speed-dependent cooling, leading to inaccuracies in temperature predictions and requiring continuous power consumption, even when the vehicle is parked.
Innovation Solution
A method that calculates the temperature of friction elements based on vehicle speed, brake pressure, external temperature, and absolute time, considering heat conduction and speed-dependent cooling, allowing for precise thermal behavior analysis without the need for temperature sensors and enabling the vehicle's kinematic behavior to be influenced for optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous temperature calculation is performed until the brake disc reaches surrounding temperature, then temperature accuracy is maintained, but power consumption increases and computing unit must remain switched on
Solution Approach 1:
The computing unit performs temperature calculations only during specific periods when braking operations are detected or anticipated, rather than continuously. The system activates the computing unit based on braking events, performs necessary calculations, and then enters a low-power state, thereby maintaining temperature monitoring capability while significantly reducing overall power consumption.
2Measurement precision
If temperature sensors are installed to directly measure friction element temperatures, then measurement accuracy is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
Instead of directly measuring temperature with physical sensors on the friction elements, the system creates a computational model that copies the thermal behavior of the brake system. The computing unit calculates temperatures based on measurable parameters like braking force, duration, and environmental conditions, thereby obtaining temperature information without the complexity of direct sensor installation on high-temperature components.
3Productivity
If thermal calculations are performed without considering heat conduction and speed-dependent cooling, then calculation speed is improved, but temperature prediction accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts calculation parameters based on operating conditions. When vehicle speed and braking intensity suggest significant thermal effects, the computing unit activates more sophisticated thermal models that account for heat conduction through the brake disc and speed-dependent cooling effects. During normal operation with minimal braking, simplified calculations are used, thereby balancing accuracy requirements with computational efficiency.
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 approach provides precise thermal state capture, reduces the risk of thermal overload, and allows for predictive maintenance, enabling the vehicle to operate within safe temperature ranges, optimizing driving characteristics and reducing the workload for drivers.
Implementation Method 1
a braking effect is generated by pressing at least a first friction element and a second friction element against each other. The conversion of kinetic energy of the vehicle into heat results in a temperature increase of the friction elements
Implementation Method 2
heat conduction through the brake disc and the cooling is calculated as a function of speed
Data Source
AI summary
A method for influencing the kinematic behavior of a vehicle, in particular a rail vehicle with at least one friction brake system, wherein a brake effect is generated by pressing at least one first and second friction elements against each other, where to achieve advantageous method conditions, temperatures of at least the first friction element are calculated from at least speed, brake pressure, external temperature of the vehicle and absolute times, and heat conduction through the first friction element and a speed-dependent cooling process of the first friction element are taken into consideration during the calculation, and where the kinematic behavior of the vehicle is influenced based on the calculation such that expensive fitting of the friction brake system with sensors for measuring friction element temperatures can be advantageously omitted, and the thermal state of the friction brake system can still be estimated with a high degree of precision.