Double Magnetic Coil Sensing for Personal Mobility Vehicle Detection
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Solution Overview
Problem
Current road sensors and monitoring systems are not designed to effectively monitor personal mobility vehicles, as they are optimized for classic combustion vehicles and fail to accurately discriminate the type, speed, and direction of personal mobility vehicles due to their geometric and electromagnetic characteristics.
Innovation Solution
A system utilizing a double magnetic coil operating at a higher frequency range (400 kHz to 800 kHz) connected to an oscillator circuit, phase-locked loop, signal conditioning circuit, and signal processor to accurately monitor personal mobility vehicles by calculating temporal variations in voltage and determining vehicle type, speed, direction, and length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If classic coil configurations (2x2 metre magnetic coils) are used for monitoring, then a greater amount of information can be obtained from combustion vehicles, but the system cannot accurately monitor personal mobility vehicles due to their smaller size and different electromagnetic characteristics
Solution Approach 1:
The patent applies local quality by making the coil configuration specific to the target object. Instead of using universal 2x2 metre coils for all vehicles, the invention uses smaller coils (e.g., 0.5x0.5 metre or 0.6x0.6 metre) specifically optimized for personal mobility vehicles. This localized adaptation allows the sensor to match the electromagnetic characteristics and physical dimensions of smaller vehicles, enabling accurate detection while maintaining compatibility with the specific vehicle type.
Solution Approach 2:
The patent implements parameter changes by modifying key electromagnetic parameters of the coil system. The oscillation frequency is increased from the traditional 100-200 kHz range to 400-800 kHz, and the coil dimensions are reduced from 2x2 metres to approximately 0.5x0.5 metres. These parameter changes enable the system to detect the smaller magnetic signatures of personal mobility vehicles while filtering out combustion vehicle signals, thus achieving both precision and adaptability.
2Measurement precision
If dual coil systems are used to reduce error margin in speed calculation, then measurement precision improves, but the system complexity and installation requirements increase
Solution Approach 1:
The patent applies merging by combining the functions of multiple coils into a single double coil configuration. Instead of using two separate 2x2 metre coils, the invention merges them into one 0.5x0.5 metre double coil that performs both detection functions. This reduction in number while maintaining functionality simplifies the system architecture and reduces installation complexity.
Solution Approach 2:
The patent uses another dimension by changing the spatial arrangement of the coil windings within the compact double coil structure. The inner and outer windings are arranged in specific geometric patterns that enable the small coil to achieve the functional equivalence of larger dual coil systems. This dimensional optimization allows precise speed measurement without requiring large physical footprints or complex multi-coil assemblies.
3Adaptability or versatility
If smaller coils are used to match personal mobility vehicle dimensions, then adaptability to personal mobility vehicles improves, but the oscillation frequency increases significantly making existing monitoring equipment unusable
Solution Approach 1:
The patent addresses this contradiction through systematic parameter changes. When coil size is reduced to match personal mobility vehicles, the oscillation frequency naturally increases. The invention accepts and utilizes this frequency increase (to 400-800 kHz) as a distinguishing feature rather than a problem. This frequency shift becomes the basis for discriminating personal mobility vehicles from combustion vehicles, transforming a potential disadvantage into a detection advantage.
Solution Approach 2:
The patent converts the harmful effect of high oscillation frequency (which makes existing equipment unusable) into a beneficial discrimination mechanism. The high frequency range of 400-800 kHz, which would normally require expensive specialized equipment, is instead used as a unique signature for personal mobility vehicles. By filtering for this specific frequency range, the system can identify and monitor personal mobility vehicles accurately without needing complex high-frequency equipment for all vehicle types.
4Measurement precision
If high frequency range (400 kHz to 800 kHz) is used for personal mobility vehicle monitoring, then measurement precision for personal mobility vehicles improves, but existing commercial traffic monitoring equipment becomes unusable
Solution Approach 1:
The patent applies local quality by creating a specialized monitoring system tailored specifically for personal mobility vehicles rather than attempting to modify existing combustion vehicle monitoring equipment. The high frequency range of 400-800 kHz is locally optimized for detecting the electromagnetic signatures of personal mobility vehicles. This specialized approach accepts reduced compatibility with existing equipment as a trade-off for achieving high precision in the target application.
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 enables efficient management and control of personal mobility vehicles, ensuring safe coexistence with other road users, verifying compliance with traffic regulations, and providing accurate data on vehicle density and traffic patterns.
Implementation Method 1
a double magnetic coil disposed at an area of personal mobility vehicle traffic, and connected to an oscillator circuit; where the assembly of double magnetic coil and oscillator circuit is in turn connected to a phase-locked loop
Data Source
AI summary
A system and method for monitoring personal mobility vehicles in urban environments, comprising a double magnetic coil (1), disposed at an area of personal mobility vehicle traffic, and connected to an oscillator circuit (2), a phase-locked loop (3), a signal conditioning circuit (4) and a signal processor (5); where the signal processor (5) is configured to calculate the temporal variation in voltage (V(t), V′(t)) produced in the phase-locked loop (3) and due to a variation in the oscillation frequency of the double magnetic coil (1) when at least one personal mobility vehicle passes said double magnetic coil (1); and to establish the type, speed, direction of travel and length of the personal mobility vehicle that has generated the variation in the oscillation frequency of the double magnetic coil (1).