Induction Loop for Low-Ohm Wheel-Rail Connection
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Solution Overview
Problem
Existing rail vehicle track occupancy detection systems face reliability issues due to high impedance between wheels and rails, especially when vehicles are parked for long periods, as they require continuous power supply and maintenance to ensure low-impedance connections, which is not feasible without external power and leads to unreliable detection.
Innovation Solution
The implementation of an intermittently fed induction loop with alternating current, which breaks through corrosion layers between wheels and rails, allowing for a low-impedance connection to be maintained with minimal energy consumption, enabling reliable track occupancy detection even when vehicles are stationary for extended periods without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power supply is provided to maintain low-impedance connection, then reliability of track occupancy detection is improved, but energy consumption increases and maintenance requirements increase
Solution Approach 1:
The patent applies periodic action by intermittently applying alternating voltage to the induction loop at specific intervals rather than continuously. This periodic voltage application breaks through corrosion layers on wheel-rail contact surfaces, maintaining low-impedance connections while significantly reducing energy consumption compared to continuous power supply.
2Reliability
If continuous power supply is provided to maintain low-impedance connection, then reliability of track occupancy detection is improved, but maintenance requirements increase
Solution Approach 1:
The patent implements self-service by using the induction loop system to automatically break through corrosion layers on the wheel-rail contact surfaces through intermittent voltage application. This self-maintaining mechanism keeps the contact surfaces conductive without requiring external maintenance interventions, reducing maintenance requirements while ensuring reliable detection.
3Reliability
If high current is applied to overcome contact resistance, then track occupancy detection reliability is improved, but energy consumption increases
Solution Approach 1:
Instead of applying high current continuously, the patent uses periodic application of alternating voltage to the induction loop. This periodic action generates sufficient current at specific intervals to break through corrosion layers and establish low-impedance connections, achieving reliable detection with significantly reduced overall energy consumption.
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 solution ensures a reliable low-impedance connection between wheels and rails, allowing for effective track occupancy detection with reduced energy consumption and minimal maintenance, enabling vehicles to be parked or towed without continuous power supply, thus enhancing safety and operational efficiency.
Implementation Method 1
by induction of an electrical voltage in a through the wheels, through sections of at least one of the rails and through electrical connections between wheels formed secondary current loop
Implementation Method 2
an intermittently fed induction loop with alternating current, which breaks through corrosion layers between wheels and rails, allowing for a low-impedance connection to be maintained
Data Source
Figure 1~2
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AI summary
The railway vehicle has an induction loop (1) for verification of low resistive electric connection between wheels (115a-115d,116a-116d) of the railway vehicle and running rails (101,102). A feeder is provided, which connects the electric alternating current voltage to the induction loop in an intermittent manner such that the induction loop is supplied with temporal interruptions with the alternating current. The duration of the temporal interruption of the supply is longer than the duration of the supply of the induction loop occurred before the interruption. An independent claim is also included for a method for operating a railway vehicle.