Eddy Current Braking Level Control for Gradient-Accurate Train Stopping
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Solution Overview
Problem
Existing maglev train systems face challenges in accurately determining eddy current braking levels to ensure safe and reliable stopping at specified positions during emergency braking, particularly due to the influence of track gradients which are often treated as random disturbances.
Innovation Solution
A method and apparatus that consider the gravitational component force caused by track gradients to determine ideal braking distances and levels, using fuzzy control to adjust braking levels based on position differences, ensuring accurate stopping at specified positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If track gradient is treated as random disturbance, then calculation complexity is reduced, but braking precision deteriorates
Solution Approach 1:
The patent converts the harmful effect of track gradient (which causes braking distance deviation) into a beneficial factor by using it as a compensation basis. The gradient compensation module calculates the gradient component force and uses it to adjust the braking curve, turning the previously harmful gradient effect into a useful correction mechanism that improves braking precision.
2Measurement precision
If gradient compensation is implemented, then braking accuracy is improved, but control system complexity increases
Solution Approach 1:
The patent segments the braking force into distinct components: ideal braking force, gradient component force, and random disturbance force. By dividing the braking control into these separate modules (ideal braking curve generation module, gradient compensation module, random disturbance compensation module), the system manages complexity through modularization while achieving high braking accuracy.
Solution Approach 2:
The patent introduces a braking curve generation module as an intermediary that translates multiple force parameters into a comprehensive braking curve. This intermediary module processes the ideal braking force, gradient compensation, and random disturbance compensation separately and combines them into a unified control signal, simplifying the overall control architecture.
3Adaptability or versatility
If multiple braking levels are used, then braking flexibility is improved, but determination complexity increases
Solution Approach 1:
The patent pre-calculates and stores multiple braking curves corresponding to different track gradients before actual braking occurs. When emergency braking is needed, the system directly selects and applies the appropriate pre-computed braking curve based on the current gradient conditions, avoiding complex real-time calculations and simplifying the determination process while maintaining high flexibility.
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 method and apparatus enable maglev trains to reliably stop at specified positions by accurately calculating braking levels, even in the presence of long or steep slopes, thereby enhancing the stability and reliability of the eddy current braking system.
Implementation Method 1
the maglev train employs eddy current braking for emergency braking. Different levels correspond to different eddy current braking excitation currents, thereby generating eddy current braking forces with varying magnitudes
Implementation Method 2
the force parameter includes: a gravitational component force caused by a gradient of a track in an operating route of the train
Data Source
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AI summary
A selection method for an eddy current braking level, comprising: on the basis of a stress parameter of a train in a braking process, acquiring an ideal braking distance corresponding to each eddy current braking level, wherein the stress parameter comprises a gravity component caused by a gradient of a road in an operation line of the train; on the basis of the ideal braking distance under each eddy current braking level, and a braking starting point, acquiring a target parking position of the train; comparing the ideal braking distance with a target braking distance to acquire an ideal braking level, wherein the target distance is the distance between the braking starting point and the target parking position; acquiring the correspondence between the distance and the speed of the train in an ideal braking process; on the basis of a difference of the operation positions in the ideal braking process and an actual braking process, acquiring a control amount; and on the basis of the control amount and the ideal braking level, acquiring an actual eddy current braking level used by the train. Further disclosed are a selection device for an eddy current braking level, a controller and a readable storage medium. By means of the actual eddy current braking level obtained by the method, the parking position of the train can be closer to a designated parking position.