Brake Caliper Pressure Evaluation via Variable Filter
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Solution Overview
Problem
Existing methods for determining the required contact pressure of friction brakes are prone to errors due to fluctuations in delay variables and neglect the varying operating states and friction coefficient changes over the brake disc's rotation, leading to inaccurate and less robust results.
Innovation Solution
A method that determines the required contact pressure by averaging current deceleration values using a variable filter, taking into account the brake's state and operating conditions, and adjusting the filter based on speed to eliminate manufacturing tolerances and wear-related issues, ensuring accurate pressure setting across the brake disc's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If instantaneous measured values of deceleration variable are used to determine required contact pressure, then the determination responds quickly to current operating conditions, but the result is error-prone due to strong fluctuations in the measured values
Solution Approach 1:
The patent applies preliminary action by determining deceleration variables at multiple predetermined positions (e.g., 0°, 90°, 180°, 270°) around the brake disc rotation cycle before calculating the average. This pre-sampling approach ensures comprehensive coverage of the operating cycle, allowing the system to capture variations in friction coefficients and operating states throughout the rotation, thereby improving accuracy while maintaining responsiveness.
Solution Approach 2:
The patent implements continuity of useful action by continuously monitoring deceleration variables at multiple positions around the brake disc rotation and continuously updating the average deceleration variable. This continuous measurement and averaging process ensures that the required contact pressure determination remains accurate and responsive to changing operating conditions without being affected by transient fluctuations at any single moment.
2Measurement precision
If the determination considers varying operating states and friction coefficient changes over brake disc rotation, then accuracy improves, but the complexity of the determination process increases
Solution Approach 1:
The patent applies segmentation by dividing the brake disc rotation into multiple discrete positions (e.g., 0°, 90°, 180°, 270°) and determining deceleration variables at each position separately. This segmentation allows the system to account for variations in operating states and friction coefficients at different positions while maintaining a structured and manageable determination process. The segmented approach simplifies the overall complexity by breaking down the continuous rotation into discrete, measurable segments.
3Power
If contact pressure is increased to optimize braking effect, then braking performance improves, but wear in the brake increases
Solution Approach 1:
The patent applies dynamics by continuously adapting the required contact pressure based on real-time determination of the state variable, which reflects varying operating conditions such as friction coefficient changes, temperature variations, and wear states throughout the brake disc rotation. This dynamic adjustment ensures that contact pressure is optimized for each specific operating state, achieving effective braking while minimizing unnecessary wear that would occur with constant high pressure.
Solution Approach 2:
The patent implements parameter changes by modifying the contact pressure parameter according to the determined state variable that captures variations in friction coefficients and operating conditions. By changing the contact pressure parameter dynamically based on measured deceleration variables and calculated state variables, the system achieves optimal braking effect under each operating condition while avoiding excessive pressure that would accelerate wear.
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 a robust and accurate determination of the required contact pressure, optimizing braking performance and reducing wear, thereby enhancing safety and economic efficiency in rail vehicle operations.
Implementation Method 1
with the at least two current values of the deceleration variable being determined by means of a variable filter processed to an average deceleration size of the brake
Implementation Method 2
friction brakes, which cause a braking effect by pressing a friction lining onto a moving counterpart
Data Source
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AI summary
A method for determining a required contact pressure variable (CSet, FClpSet) of at least one brake (26), in particular friction brake, of a vehicle is disclosed, wherein at least two current values of a deceleration variable (Frb, Mrb) of the at least one brake (26) are determined, wherein the at least two current values of the deceleration variable (Frb, Mrb) are processed by means of a variable filter (21) to form a mean deceleration variable (Frbmean) of the brake (26), wherein a state variable (MUEB) of the at least one brake (26) is determined from the mean deceleration variable (Frbmean) and a current contact pressure variable (FClp), wherein a required contact pressure variable (CSet, FClpSet) of the at least one brake (26) is determined from a required a deceleration variable (FrbSet) and the state variable (MUEB), as result of which the determination of the contact pressure variable (CSet, FClpSet) is advantageously carried out taking into account the state by means of the state variable (MUEB) of the brake (26).