Train Speed Measuring Device with Motor and Trailer Tachometers
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Solution Overview
Problem
Current train speed measuring devices face inaccuracies due to slip and slide phenomena, particularly in rainy conditions, which can lead to incorrect speed measurements and safety risks during automatic train operations.
Innovation Solution
The implementation of a train speed measuring device that includes at least one tachometer on each axle of a motor car and a trailer car, with a speed measuring unit and a speed calculating unit to determine the train's speed by comparing pulse signals from both, allowing for accurate speed calculation and compensation for slip phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tachometer is installed at a vehicle axle to measure speed, then the speed measurement is simple and direct, but the measurement accuracy deteriorates when slip or slide phenomena occur on the axle
Solution Approach 1:
The train is divided into motor cars and trailer cars, with separate tachometers installed on each type. The speed measurement system segments the train into functional units, measuring speed independently on motor cars and trailer cars, then combining the data to determine overall train speed, thereby reducing the impact of localized slip or slide phenomena
Solution Approach 2:
The patent introduces an intermediary calculation method that uses the speed difference between motor cars and trailer cars as a mediator to detect and correct measurement errors. By comparing the speeds from both types of cars, the system identifies anomalies caused by slip or slide and adjusts the final speed measurement accordingly
2Ease of manufacture
If speed is calculated based on axle revolution speed, then the measurement method is straightforward, but reliability deteriorates when abnormal situations such as slip and slide occur
Solution Approach 1:
The patent merges the speed measurement data from both motor cars and trailer cars into a unified speed calculation system. By combining multiple independent measurement sources, the system achieves higher reliability than any single tachometer could provide alone, while maintaining relative simplicity through standardized measurement procedures
Solution Approach 2:
The system implements feedback by continuously monitoring the speed difference between motor cars and trailer cars. When the difference exceeds a predetermined threshold, the system triggers error correction mechanisms, creating a closed-loop control system that automatically detects and responds to measurement anomalies, thereby improving reliability
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 improves the accuracy of train speed measurement by reducing errors caused by slip and slide phenomena, ensuring safer and more precise automatic operations by calculating the train's speed based on the comparison of motor car and trailer car speeds, thus preventing collisions and maintaining safety.
Implementation Method 1
a tachometer installed at a vehicle axle and calculates the train speed by using a speed pulse proportional to the revolution speed of an axle
Data Source
AI summary
Provided are a train speed measuring device and method. The train speed measuring device includes: at least one first tachometer disposed at an axle of a trailer car and for outputting a pulse signal according to a wheel revolution of the trailer car; at least one second tachometer disposed at an axle of a motor car and for outputting a pulse signal according to a wheel revolution of the motor car; at least one speed measuring unit for measuring speed values on the basis of pulse signals outputted from the at least one first tachometer and the at least one second tachometer; and a speed calculating unit for calculating the speed of the train on the basis of the measured speed values.