Magnetic Marker Detection Using Lateral Field Shift Analysis
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Solution Overview
Problem
Conventional marker detection systems for magnetic markers in roads face reliability issues due to magnetic disturbances from sources like iron manhole covers and other vehicles, leading to erroneous detection.
Innovation Solution
A vehicular system equipped with a magnetic detection unit comprising multiple sensors across the vehicle width, which determines the presence of magnetic markers and identifies potential disturbance sources by analyzing the positional change of the magnetic distribution center, using indices such as positional change amount or change rate, and correcting for steering angle and yaw rate variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are used to detect magnetic markers in the road, then vehicle positioning and lane detection capabilities are improved, but detection reliability deteriorates due to magnetic disturbances from sources like iron manhole covers and other vehicles
Solution Approach 1:
The magnetic detection unit is divided into multiple magnetic sensors arranged in the vehicle width direction. Each sensor independently detects magnetic field strength, and the system segments the detection process into marker detection and disturbance source detection through pattern recognition, allowing reliable identification despite individual sensor disturbances
Solution Approach 2:
A pattern recognition unit acts as an intermediary between the magnetic sensors and the control system. This intermediary processes the raw magnetic field data, identifies characteristic patterns of magnetic markers versus disturbance sources, and makes determination decisions, thereby isolating the detection system from the复杂性 of magnetic disturbances
2Reliability
If multiple magnetic sensors are arranged in the vehicle width direction to improve detection reliability, then the ability to distinguish disturbance sources from actual markers is improved, but the system complexity increases
Solution Approach 1:
The pattern recognition unit serves multiple functions: it detects magnetic markers, identifies disturbance sources, determines the vehicle's lateral position relative to lane markers, and provides this information to the control system. This multi-functionality reduces the need for separate systems and minimizes overall complexity despite using multiple sensors
Solution Approach 2:
The patent combines the detection of magnetic markers and the identification of disturbance sources into a single integrated detection process. The pattern recognition unit simultaneously analyzes magnetic field patterns from multiple sensors to perform both functions, reducing system complexity compared to having separate detection and identification systems
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 approach reduces erroneous detection of magnetic markers by accurately determining the presence of disturbance sources, maintaining high determination accuracy and stabilizing control systems for assisted driving.
Implementation Method 1
a magnetic detection unit with a plurality of magnetic sensors arranged in a vehicle width direction
Implementation Method 2
a center position of a magnetic distribution in the vehicle width direction acting on the magnetic detection unit is identified
Data Source
AI summary
A marker detection method in which a magnetic detection unit (11) of a vehicle side that includes a plurality of magnetic sensors arranged in a vehicle width direction is used to detect magnetic markers (10) that are laid in a road, the method executes detection of a center position in the vehicle width direction of a magnetic distribution that acts on the magnetic detection unit (11) and processing of an index representing a degree of a positional change of the center position when a vehicle (5) passes over the magnetic markers (10) to determine a possibility of the presence of magnetic generation sources that causes disturbance, thereby suppressing erroneous detection of the magnetic markers (10).