Magnetic Guideway Position Sensing for Dust-Resistant Vehicle Tracking
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Solution Overview
Problem
Existing displacement measurement systems are prone to errors due to dirt and dust, are costly, and are economically disadvantageous for long sections, especially in areas with high dust or dirt deposits.
Innovation Solution
A displacement measurement unit using spaced locators with unique main and pair distances, combined with a position sensor attached to a vehicle, which includes a data read/write head for contactless data transmission, and redundant detection to verify absolute position, utilizing inductive, magnetic, or magnetostrictive sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code marks are used for displacement measurement, then position detection is achieved, but the system becomes prone to errors from dirt and dust
Solution Approach 1:
The patent replaces mechanical/optical code mark detection systems with a magnetic field-based measurement system. Instead of using physical code marks that are read by optical sensors (which are sensitive to dirt and dust), the invention uses magnetic locators that generate magnetic fields detected by a position sensor, eliminating the sensitivity to environmental contaminants while maintaining position detection accuracy.
Solution Approach 2:
The invention changes the physical parameter used for measurement from optical reflection (code marks) to magnetic field strength and direction. By measuring the magnetic field parameters generated by permanent magnets in the locators, the system achieves position detection that is immune to dirt and dust accumulation, as magnetic fields are not affected by surface contamination.
2Measurement precision
If closed marking systems are used, then position measurement is achieved, but the system becomes costly and complex
Solution Approach 1:
The patent extracts only the essential positioning function from complex code mark systems. Instead of using complete closed marking systems with multiple code marks and complex reading heads, the invention uses simple magnetic locators with permanent magnets that provide position information through their magnetic field characteristics, significantly reducing system complexity while maintaining measurement accuracy.
Solution Approach 2:
The invention replaces expensive, complex code mark systems with simpler, more economical magnetic locators. The magnetic locators using permanent magnets are cheaper to manufacture and install, and while individual locators may need replacement, the overall system cost is reduced compared to maintaining complex closed marking systems.
3Measurement precision
If code marks are used, then position detection is achieved, but the system is failure-prone and requires high maintenance
Solution Approach 1:
The patent replaces the mechanical/optical code mark system with a magnetic field-based system that has no moving parts and no surface markings to wear or become obscured. The magnetic locators with embedded permanent magnets provide reliable position detection without the maintenance issues associated with code marks that can be damaged by dirt, dust, or physical wear.
Solution Approach 2:
The invention incorporates redundant locators and uses the magnetic field characteristics (strength and direction) to provide backup position information. If one locator becomes partially obscured or fails, the system can still determine position using the magnetic field data from remaining locators, providing fault tolerance before complete system failure occurs.
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 provides accurate and robust displacement measurement resistant to dirt and dust, with redundant verification, ensuring precise vehicle positioning even in challenging environments.
Implementation Method 1
wherein the position sensor (5) is an inductive, magnetic and/or magnetostrictive position sensor
Implementation Method 2
wherein the position sensor (5) is an inductive, magnetic and/or magnetostrictive position sensor
Implementation Method 3
wherein the position sensor (5) is an inductive, magnetic and/or magnetostrictive position sensor
Data Source
AI summary
The present disclosure relates to displacement measurements using magnetic displacement measurement units. In various embodiments, the disclosed displacement measurement unit is configured to determine a displacement position of a vehicle along a guideway. In various embodiments, the displacement measurement unit includes a set of locator devices that are distributed at fixed displacement positions along the guideway, where a given locator device includes a magnetic element configured to produce a corresponding magnetic field. Further, in various embodiments, the displacement measurement unit includes a position sensor that is attached to the vehicle, where the position sensor is configured to detect a magnetic field produced one or more of the locator devices when the position sensor is brought within a detection range of one or more locator devices.