Train Position Correction Using Beacons and Base Station IDs

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Solution Overview

Problem

Conventional methods for calculating train travel position using wheel revolutions are prone to errors due to spinning or sliding between rails and wheels, which accumulate over long distances, especially in operations where trains do not stop at stations or stop at fewer stations.

Innovation Solution

A train information management apparatus that includes a calculator for wheel revolutions, a beacon information receiving unit, an on-board communication unit, a storage unit, and a correction control unit to correct the travel position using beacon and base station information, even during operations without station stops.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the train calculates travel position based on wheel revolutions, then the calculation is simple and continuous, but errors accumulate over long distances especially when the train does not stop at stations

Engineering Contradiction:

Improvetravel position accuracyVSAvoiderror accumulation distance

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent introduces beacons as intermediary reference objects placed at specific locations along the track. The train detects these beacons to obtain absolute position information, which serves as a mediator to correct the cumulative errors from wheel revolution counting. This intermediary system provides periodic reset points without requiring the train to stop at stations.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback by comparing the position calculated from wheel revolutions with the absolute position obtained from beacon detection. When a discrepancy is detected, the system feeds back a correction to reset the cumulative counter, preventing further error accumulation. This feedback mechanism operates continuously without requiring station stops.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If the train stops at all stations to reset travel distance, then errors are reduced, but trains that do not stop at stations (like limited express trains) cannot benefit from this error reduction

Engineering Contradiction:

Improvetravel distance accuracyVSAvoidapplicability to different train operations

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The beacon-based correction system serves multiple functions: it provides position reference for all trains regardless of their stopping pattern, enables error correction for both local and express trains, and maintains compatibility with existing wheel revolution counting systems. This universal solution adapts to different operational modes without requiring modification to the correction mechanism.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Beacons are pre-installed at specific locations along the track at predetermined intervals. This preliminary placement ensures that regardless of whether a train stops at stations or not, it will encounter beacon references during its journey, enabling error correction to occur naturally during operation without requiring operational changes.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the train uses only wheel revolution counting, then the system is simple, but errors occur due to spinning or sliding between rails and wheels

Engineering Contradiction:

Improvesystem structureVSAvoidtravel position reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent merges two positioning methods: wheel revolution counting (odometer method) and beacon-based absolute positioning. The system combines the continuous measurement capability of wheel counting with the periodic absolute reference from beacons, creating a hybrid system that maintains simplicity while improving reliability through the integration of complementary measurement approaches.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12552428B2Train information management apparatus, train information management system, and train information management method

Publication Date: 2026.02.17 MITSUBISHI ELECTRIC CORP

AI summary

A train information management apparatus includes a calculator that calculates a first travel position of a train based on the number of revolutions of wheels of the train, a beacon information receiving unit that receives information from a beacon, an on-board communication unit that communicates with a base station and acquires identification information on the base station, a storage unit that stores, when the train passes over a specific beacon, combined information of information on the specific beacon passed over, the identification information on the base station with which the on-board communication unit communicates, and information on a second travel position of the train, and a correction control unit that corrects the first travel position with the second travel position using the combined information when the train passes over the specific beacon during operation in which the train does not stop at stations at a specified frequency.