Multi-Magnetic Sensor Road Marking Detection Under Vibration Noise

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Solution Overview

Problem

Magnetic sensors in autonomous vehicles are prone to noise interference due to vehicle vibration and uneven road surfaces, affecting the accuracy of magnetic signal detection from road markings.

Innovation Solution

Utilizing multiple magnetic sensors to generate frequency-converted signals by averaging detection signals, subtracting noise using time differences between sensor outputs, and incorporating vibration frequency data to further reduce noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single magnetic sensor is used to detect magnetic signals from road markings, then the device complexity is reduced, but the measurement precision deteriorates due to noise interference from vehicle vibration and road unevenness

Engineering Contradiction:

Improvesensor configurationVSAvoidmagnetic signal detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides the detection system into multiple magnetic sensors (first magnetic sensor and second magnetic sensor) positioned at different locations. Each sensor detects magnetic signals independently, and the signals are subsequently processed by calculating time differences and averaging to eliminate noise. This segmentation allows the system to maintain low individual sensor complexity while achieving high overall measurement precision.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple magnetic sensors are deployed to improve signal detection accuracy, then the measurement precision improves, but the device complexity increases

Engineering Contradiction:

Improvemagnetic signal detection accuracyVSAvoidsensor configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines the outputs of multiple magnetic sensors through signal processing operations. The magnetic signals from the first and second magnetic sensors are merged by calculating time differences between their outputs and computing average values. This merging process integrates the information from multiple sensors to enhance measurement precision while managing the complexity through systematic signal combination rather than independent processing channels.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of information

If magnetic sensors are used to detect signals from magnetic paint on road markings, then the ability to provide driving information is improved, but the reliability deteriorates due to noise from vehicle vibration and magnetic material vibration

Engineering Contradiction:

Improvedriving information accuracyVSAvoidsignal detection reliability

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the detected magnetic signals are continuously processed to extract time difference information and average values. This feedback loop allows the system to adapt to varying noise conditions by continuously adjusting the signal processing parameters based on the actual detected signals, thereby improving both the accuracy of driving information and the reliability of signal detection in noisy environments.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent converts the harmful effect of vehicle vibration and magnetic material vibration into a useful feature. By detecting the time difference in signal arrival between multiple sensors caused by these vibrations, the system can identify and eliminate noise components. The vibration that initially degrades reliability is transformed into a characteristic that helps distinguish noise from actual magnetic paint signals, thereby improving detection reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enhances the Signal-to-Noise Ratio (SNR) and accurately detects magnetic patterns from road markings, providing comprehensive driving information to autonomous vehicles and pedestrians.

Implementation Method 1

magnetic sensors detect a magnetic field changing over time... a magnetic sensor installed in a vehicle being operated senses that a magnetic field, generated from road markings on which a magnetic pattern is formed by including magnetic particles, changes over time

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Implementation Method 2

the vehicle itself may vibrate due to the engine thereof or vibration may be caused due to an uneven road surface, in which case the magnetic sensor installed in the vehicle also vibrates

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS12447972B2Method and apparatus for recognizing driving information by using plurality of magnetic sensors

Publication Date: 2025.10.21 JS CHEM CORP

AI summary

Disclosed herein are a method and apparatus for recognizing driving information using multiple sensors. The method for recognizing driving information according to an embodiment of the present disclosure includes generating a magnetic sensing signal from magnetic paint applied to road markings, generating a frequency-converted signal using the magnetic sensing signal, and generating driving information for a vehicle using the frequency-converted signal.