Electromagnetic Brake Monitoring via Coil Current Sensing
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Solution Overview
Problem
Existing methods for monitoring electromagnetically actuated brakes lack effective means to determine wear and operational state, particularly in identifying deviations from intended behavior and detecting sudden failures, which can lead to unsafe vehicle operation.
Innovation Solution
The method involves detecting the current flowing through the coil and analyzing the current curve to determine the relative position of the solenoid, assessing wear, and monitoring for threshold deviations, using the coil as a sensor to evaluate the brake's engaged or released state, and detecting temperature and ohmic resistance to ensure proper functioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the coil is used as a sensor to determine solenoid position from the current curve, then the measurement precision of brake state is improved, but the device complexity is reduced by eliminating separate sensors
Solution Approach 1:
The coil serves dual functions: as the actuator that generates the magnetic field to move the solenoid, and as a sensor that detects the solenoid position through current curve analysis. This multi-functionality eliminates the need for separate position sensors, reducing device complexity while maintaining measurement precision through the electromagnetic coupling between the coil and solenoid.
2Measurement precision
If voltage is increased in time intervals to determine solenoid position, then the measurement precision is improved, but the use of energy by the coil increases
Solution Approach 1:
Voltage is applied to the coil in periodic time intervals rather than continuously, allowing the current curve to be measured at specific moments when position information is needed. This periodic excitation provides sufficient measurement precision for brake state detection while significantly reducing overall energy consumption compared to continuous voltage application.
3Reliability
If the brake wear is monitored by determining solenoid position in the engaged state, then the reliability is improved, but the measurement precision requirements increase
Solution Approach 1:
The system continuously monitors the solenoid position in the engaged state and compares it against reference values to detect wear. When the position deviates from expected ranges, the system provides feedback through warning or error messages. This feedback mechanism enhances reliability by enabling early wear detection while allowing moderate measurement precision thresholds.
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 allows for simple and effective condition and function monitoring, enabling early detection of wear and potential failures, thereby ensuring safe operation by displaying warnings or error messages when deviations occur.
Implementation Method 1
a brake has a coil whose energization generates a magnetic field, which is intended for electromagnetic actuation
Implementation Method 2
the current flowing through the coil is detected... the brake coil acts as a sensor. This allows the position of the solenoid to be determined from the current curve
Data Source
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AI summary
The invention relates to a method for monitoring an electromagnetically actuatable brake which has an energizable coil that interacts with a solenoid arranged in a linearly movable manner and to a vehicle with an electromagnetically actuatable brake. The current flowing through the coil is detected, wherein the detected current value is fed to an analysis unit in particular. The voltage applied to the coil is increased during particular periods of time, and the current curve, in particular the curve of the current increase, produced thereby determines the position of the solenoid relative to the coil. In particular, the determined position is used to determine whether the brake is in the engaged state or in the released state. In particular, the solenoid is designed as a permanent magnet or has a permanent magnet.