Railway Track Occupancy Signal Device with Multi-Frequency Error Detection
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Solution Overview
Problem
Current devices for generating occupancy signals in railway track systems are limited in detecting errors and maintaining signal integrity, particularly in cases of changes in rail resistance or detuning of tuning devices, which can lead to inaccurate occupancy indications.
Innovation Solution
The device generates transmission signals with multiple comparison frequencies in addition to the primary operating frequency, allowing the evaluation device to detect errors by comparing signal levels and generating control or error signals based on deviations from stored reference levels, thereby indicating proper functioning, trackside errors, or device-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple comparison frequencies are generated and transmitted, then error detection capability is improved, but device complexity increases
Solution Approach 1:
The transmission device periodically transmits test signals at different frequencies (working frequency and comparison frequencies) in alternating time intervals. This periodic action allows the system to use multiple frequencies for error detection without continuously transmitting all frequencies simultaneously, thereby improving reliability while controlling device complexity through time-multiplexed operation
Solution Approach 2:
The system changes the frequency parameter of the transmitted test signal between working frequency and comparison frequencies. By varying this parameter over time and evaluating signal levels at different frequency points, the system achieves enhanced error detection capability without requiring multiple permanent transmission channels, thus managing device complexity
2Measurement precision
If signal levels are measured at multiple frequencies, then detection precision is improved, but measurement time increases
Solution Approach 1:
The system performs preliminary measurements at comparison frequencies during periods when the track section is known to be unoccupied or during initialization phases. These preliminary measurements establish reference signal levels that can be used for quick error detection during normal operation, reducing the time needed for full multi-frequency evaluation during critical occupancy detection
Solution Approach 2:
The evaluation device performs partial frequency sweeps rather than complete measurements at all frequencies continuously. It selectively measures at working frequency and selected comparison frequencies based on operational needs, achieving sufficient detection precision without the time cost of exhaustive multi-frequency measurements at all times
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 enhances the ability to detect errors and maintain signal integrity by using comparison frequencies to identify changes in rail resistance and detuning, ensuring accurate occupancy signaling and device operation.
Implementation Method 1
a transmission device (100; 110; 120; 130; 140) for feeding a transmission signal S having a predetermined operating frequency f4 into at least one rail (20; 21; 22) of the track section (20)
Implementation Method 2
a receiving device (400; 405) for receiving the transmitted signal
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a device (10) for generating an occupancy signal indicating the occupancy of a track section of a railway track system, wherein the device comprises: a transmitter for feeding a transmitter signal having a predetermined operating frequency at least temporarily into at least one rail of the track section, a receiver for receiving the transmitter signal, an evaluation device for evaluating the received signal of the receiver, and at least one tuning device switchable between the transmitter and the rail or between the receiver and the rail, which enables an adjustment of the frequency response of the signal path in the section between the transmitter and the receiver with a view to minimal signal attenuation for the predetermined operating frequency.According to the invention, the transmitting device is designed in such a way that it additionally generates or can generate the transmitted signal with at least two comparison frequencies, wherein one of the comparison frequencies is below the operating frequency and the other is above the operating frequency, and the evaluation device is suitable for outputting the measured signal levels of the received signal for the operating frequency and the at least two comparison frequencies or for using them to form a control signal or error signal.