Train Protection Control for Idling and Gliding Detection
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Solution Overview
Problem
Existing train speed detection systems, such as those using tachogenerators and millimeter-wave sensors, often experience errors in speed value discrepancies, leading to inaccurate detection of idling and gliding, and increasing the abnormality judgment threshold delays these detections.
Innovation Solution
A train protection system that combines rotation speed detection from a wheel or axle with non-contact speed sensors to accurately determine idling and gliding by monitoring changes in speed differences and accelerations, using a computation section to analyze these differences and trigger protective controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the abnormality judgment threshold is increased to avoid erroneous detection, then false detection of idling and gliding is reduced, but the detection of actual idling and gliding is delayed
Solution Approach 1:
The patent divides the speed detection system into two independent channels: a first speed detection device (tachogenerator) and a second speed detection device (millimeter-wave sensor). Each device operates independently to detect train speed, and their results are compared to determine abnormalities. This segmentation allows the system to maintain a lower, more responsive threshold while using the dual-channel comparison to filter out false detections caused by steady-state errors in either single channel.
2Measurement precision
If a steady-state speed detection error exists between tachogenerator and millimeter-wave sensor, then accurate detection of idling and gliding becomes difficult, but lowering the threshold causes false detections
Solution Approach 1:
The system continuously compares the speed values from the first and second detection devices and uses this feedback to determine whether an abnormality has occurred. By monitoring the difference between the two independent speed measurements in real-time, the system can distinguish between steady-state errors (consistent offset) and actual abnormalities (sudden changes), thereby improving both measurement precision and reliability simultaneously.
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 system enhances the accuracy of detecting idling and gliding, allowing for timely intervention and improving safety by reducing misalignment of on-rail positions, thus supporting safe and efficient train operations.
Implementation Method 1
The tachogenerator generates a speed pulse based on the rotation speed of a wheel
Implementation Method 2
The speed sensor detects a first train speed based on waves that are reflected when millimeter waves are radiated onto a track
Data Source
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AI summary
Disclosed is a train protection system 10 that includes a vehicle 8, a train onboard device 6, a first device 1, and second devices 2 and 3. The vehicle 8 runs when a wheel 4 rolls on a track. The first device 1 detects rotation of at least one of the wheel 4 and an axle of the wheel 4. The second devices 2 and 3 detect a running state of the vehicle 8. The train onboard device 6 is a control device that is mounted in the vehicle 8 to control the running of the vehicle 8, and is configured to determine at least one of gliding and idling of the vehicle 8 in accordance with the result of detection by the first device 1 and with the results of detection by the second devices 2 and 3. The train onboard device 6 exercises protective control over the running of the vehicle 8 in accordance with the result of the determination and with a signal from a ground device.