AGV Magnetic Sensor Assembly for Weak Field Tracking
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Solution Overview
Problem
Current automatic guided vehicle (AGV) guidance systems, particularly those using passive magnetic markers, face challenges in accurately and precisely tracking weak magnetic fields due to limited flexibility, high installation costs, and complexity, especially when navigating route junctions and divergences, as well as sensitivity to ambient magnetic fields and variations in marker width and sensor height.
Innovation Solution
The system employs a magnetic sensor assembly with orthogonal detectors to measure magnetic field strength along multiple axes, using vector calculations to determine the AGV's position and provide steering corrections, allowing precise tracking of continuous magnetic pathways with reduced calibration requirements and increased flexibility in route changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive magnetic markers are used to reduce installation costs and increase flexibility, then guide path revision flexibility is improved and installation costs are reduced, but magnetic field strength decreases making accurate tracking difficult
Solution Approach 1:
The patent combines multiple magnetic field detectors (at least two detectors) into a single magnetic sensor assembly to detect the magnetic field from passive markers. This merging of detection capabilities compensates for the weak magnetic field strength by aggregating signals from multiple detectors, enabling accurate tracking while maintaining the advantages of passive markers.
Solution Approach 2:
The magnetic sensor assembly with multiple detectors serves multiple functions: it can track the magnetic pathway, determine AGV position, and provide steering corrections. This multi-functionality allows the system to achieve accurate tracking with passive markers without requiring additional specialized components.
2Ease of manufacture
If traditional magnetic sensors are used to detect weak magnetic fields from passive markers, then installation costs are reduced, but tracking accuracy deteriorates especially at route junctions
Solution Approach 1:
The patent merges multiple magnetic field detectors into a unified sensor assembly that processes signals collectively. This combination enables the system to maintain high position determination accuracy while using cost-effective passive magnetic markers, resolving the contradiction between low installation cost and high tracking precision.
3Measurement precision
If orthogonal magnetic field detectors are used to measure field strength along multiple axes, then position determination accuracy is improved, but sensor assembly complexity increases
Solution Approach 1:
The patent applies local quality by configuring detectors along the centerline of the magnetic pathway with specific orthogonal orientations. This localized, strategic arrangement of sensors maximizes position determination accuracy while minimizing unnecessary complexity in the overall sensor assembly design.
4Measurement precision
If precise sensor alignment and calibration are required for accurate magnetic field tracking, then tracking precision is improved, but system complexity and calibration time increase
Solution Approach 1:
The magnetic sensor assembly with multiple orthogonal detectors is designed to self-determine the AGV's position and orientation relative to the magnetic pathway without requiring external calibration equipment or complex alignment procedures. The system uses the magnetic field geometry itself to provide reference information, enabling automatic position determination and reducing calibration complexity.
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 enables accurate and efficient navigation of AGVs along magnetic pathways with reduced costs and complexity, improved flexibility in route revisions, and robustness against ambient magnetic fields, without the need for precise sensor alignment or calibration, ensuring precise tracking of magnetic markers even at junctions and divergences.
Implementation Method 1
a first magnetic field detector arranged adjacent to a second magnetic field detector and the first magnetic field detector is configured to measure the strength of the magnetic field produced by the pathway along a first axis
Data Source
AI summary
An apparatus and method for guiding an automatic guided vehicle along a magnetic pathway and more specifically to an apparatus and a method capable of accurately and precisely following a weak magnetic field emitted by a substantially continuous passive magnetic marker having route junctions.