AGV Navigation Error Correction Using Magnetic Nail Positioning
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Solution Overview
Problem
Existing AGV navigation methods face challenges with accumulating measurement errors, leading to straying from preset tracks, and current correction methods like ultrasonic, laser, and image positioning are costly, inconvenient, and prone to disturbances, resulting in low precision and stability.
Innovation Solution
A navigation errors correction method using magnetic nail positioning, where magnetic nails are set within the AGV's movement area, creating an information-bearing magnetic field detected by sensors to accurately determine the AGV's position and orientation, allowing for real-time correction of errors without spatial or environmental restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic location errors correction, laser positioning errors correction or image positioning errors correction is used, then positioning correction function is provided, but the application device is demanding, operation environment is demanding, cost is high, and precision and stability are low due to sensitivity to disturbance
Solution Approach 1:
The patent uses magnetic nails as a simple, inexpensive positioning marker instead of complex ultrasonic, laser, or image positioning systems. The magnetic nail is a passive, low-cost object that creates a magnetic field for positioning without requiring complex active sensors or processing equipment, thereby reducing device complexity while maintaining positioning precision.
Solution Approach 2:
The patent replaces complex mechanical or optical positioning systems (ultrasonic, laser, image-based) with a magnetic field-based positioning system. The magnetic nail creates an information-bearing magnetic field that can be detected by magnetic sensors, substituting mechanical/optical systems with a simpler magnetic field interaction system that is less sensitive to environmental disturbances.
2Measurement precision
If magnetic nail positioning is used, then positioning precision and environmental adaptability are improved, but magnetic nails need to be arranged along the movement track
Solution Approach 1:
The positioning track is divided into segments with magnetic nails placed at specific intervals. This segmentation allows the system to achieve high positioning precision at key points while reducing the overall number of magnetic nails needed compared to continuous coverage, thereby balancing positioning accuracy with ease of implementation.
Solution Approach 2:
The patent uses magnetic nails at critical positions along the track rather than continuous coverage. This partial action approach provides sufficient positioning precision where needed (at magnetic nail locations) while reducing the total number of markers required, making the system easier to manufacture and deploy.
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 method provides precise, adaptable, and cost-effective navigation error correction, resistant to light disturbances and ground contamination, with the ability to adjust sensor density based on error accumulation rates, ensuring accurate and stable AGV movement.
Implementation Method 1
an information-bearing magnetic field mode is established according to the magnetic field formed by said magnetic nail
Data Source
AI summary
A navigation errors correction method based on magnetic nail positioning includes a magnetic nail is set within the moving area of AGV, and an information-bearing magnetic field mode is established according to magnetic field formed and stored in a navigation device. The method further includes a navigation device in AGV guides movement of AGV; a magnetic sensor on AGV detects features of magnetic field on movement track. Contrast features of magnetic field detected by magnetic sensor with those of magnetic field mode prestored by navigation device, and reckon the relative position of magnetic nail and AGV. Based on relative position of magnetic nail and AGV, reckon current position of AGV, the navigation device adjusts position and orientation of AGV and guides AGV to repair movement errors based on reckoning position of AGV.