Magnetic Sensor Calibration Using On-Board Field Generation
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Solution Overview
Problem
Conventional magnetic marker detection methods using multiple magnetic sensors suffer from amplified errors due to individual differences in output characteristics, requiring frequent calibration, which increases user burden.
Innovation Solution
A magnetic measurement system that includes a magnetic sensor with a magnetic-field generation part, a storage unit for characteristic information, and a calibration mechanism to adjust the sensor output based on estimated magnetic differential values, ensuring accurate magnetism measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential operation is used to suppress disturbance magnetism, then detection accuracy is improved, but individual difference errors are amplified
Solution Approach 1:
The patent applies preliminary action by performing calibration of the magnetic sensor before actual magnetic marker detection. The calibration process uses a known magnetic field source to establish reference output values and individual difference characteristics. This preliminary calibration enables the system to compensate for individual sensor variations during differential operations, thereby maintaining both detection accuracy and output reliability without requiring frequent recalibration.
2Measurement precision
If magnetic sensors are regularly calibrated, then measurement accuracy is maintained, but user burden increases
Solution Approach 1:
The patent implements self-service by enabling the magnetic sensor to perform automatic calibration using an on-board magnetic field generation part. The sensor system calibrates itself by generating known magnetic fields and measuring its own responses, storing calibration data in memory. This self-calibration capability maintains measurement accuracy without requiring external calibration equipment or user intervention, significantly reducing user burden while preserving precision.
Solution Approach 2:
The magnetic-field generation part serves multiple functions: it generates magnetic fields for detection, provides calibration reference fields, and enables self-diagnosis of sensor characteristics. This multi-functionality eliminates the need for separate calibration equipment, allowing the system to maintain accuracy independently.
3Measurement precision
If multiple magnetic sensors are used for detection, then disturbance magnetism is suppressed, but device complexity increases
Solution Approach 1:
The patent merges the magnetic sensor and magnetic-field generation part into an integrated unit. This combination allows the sensor to generate its own calibration fields and perform self-diagnosis, reducing the need for external calibration equipment and simplifying the overall system architecture while maintaining the benefits of multiple sensor differential operations.
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 achieves high accuracy in magnetic measurement by calibrating the sensor using the magnetic-field generation part, reducing errors and the need for frequent maintenance.
Implementation Method 1
a magnetic sensor provided with a magnetic-field generation part which generates a magnetic field in accordance with a current passed
Data Source
AI summary
A marker detection device which detects a magnetic marker laid in a road by using a sensor unit in which a plurality of combinations of a magnetic sensor and a magnetic-field generation coil are arranged includes a storage part which stores characteristic information of each magnetic-field generation coil, an estimation part which estimates a magnetic differential value acting on the magnetic sensor due to a current differential value acting on the magnetic-field generation coil by referring to the characteristic information of each magnetic-field generation coil, and a calibration part which calibrates each magnetic sensor so as to enhance uniformity in sensitivity, which is a ratio between an output differential value of the magnetic sensor in accordance with a change of a current by the current differential value acting on the magnetic-field generation coil and the estimated magnetic differential value.