Rail Vehicle Magnetic Brake Monitoring via Current Derivative Analysis
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Solution Overview
Problem
Magnetic rail brakes are limited to emergency use due to high maintenance costs and wear, and their integration into regular braking systems is hindered by the need for reliable diagnostics that can ensure their operational readiness and braking function, especially at higher speeds.
Innovation Solution
A device and method for monitoring magnetic brakes that continuously monitor the energization of the brake magnet current and voltage, using zero crossings of the first derivative to determine the brake's placement on the rail, allowing for reliable diagnostics and fault detection, and incorporating additional sensors for enhanced monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic brake is integrated into regular braking systems, then braking performance is improved, but reliability requirements increase
Solution Approach 1:
The system performs preliminary diagnostics by continuously monitoring the current curve before actual braking operations. The derivation analysis of the current curve detects zero crossings that indicate proper magnet placement on the rail, ensuring the brake is ready for use before it is needed.
Solution Approach 2:
The monitoring device provides continuous feedback about the magnetic brake's operational status by analyzing the current curve characteristics. This feedback mechanism allows the system to verify proper brake function and detect abnormalities, ensuring reliability through real-time monitoring.
2Measurement precision
If optical detection is used to check magnet lowering, then position monitoring is achieved, but device complexity increases
Solution Approach 1:
The patent replaces optical detection systems with an electrical measurement approach. By monitoring the current curve through the brake magnet and analyzing its derivation, the system determines magnet placement without requiring separate optical sensors or complex detection equipment for each wagon.
Solution Approach 2:
The existing current monitoring circuit serves multiple functions: it controls the brake magnet operation and simultaneously provides diagnostic information about magnet placement through current curve analysis. This eliminates the need for separate dedicated detection systems.
3Reliability
If brake magnet current is continuously monitored, then operational readiness is ensured, but energy consumption increases
Solution Approach 1:
The system uses the existing operational current through the brake magnet for monitoring purposes. The same current that powers the brake magnet also provides the signal for diagnostics, eliminating the need for separate monitoring power sources or additional sensing circuits that would consume extra energy.
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
Enables the magnetic brake to be fully credited to the braking performance, ensuring reliable operation and quick fault detection, independent of external influences, thus allowing its integration into regular braking systems.
Implementation Method 1
the magnet is lowered by compressed air, but touching the rail does not happen until the power has been switched on. When current flows through the electromagnet, the brake shoe is lowered onto the rail and pulled against it and is pressed on by the magnetic force
Implementation Method 2
The friction ensures the braking effect, which is not noticeably impaired even by slippery rails
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a device for monitoring a magnetic brake on rail vehicles, wherein the magnetic brake is connected to a voltage source for energizing it, the device comprises the switching on and monitoring of the brake magnet current, and the monitoring device includes a detection device and an evaluation device, wherein the detection device continuously monitors the function of the circuit for energizing the magnetic brake during braking and records the current and/or voltage profile. The evaluation device determines, based on the recorded current and/or voltage profile, when the magnetic brake engages the rail by detecting two zero crossings of the first derivative of the current and/or voltage profile.