Autonomous Work Machine Dock Angle Sensing for Map Accuracy
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Solution Overview
Problem
Conventional autonomous work machines face challenges in accurately performing tasks due to deformation of the area map when a shift in angle occurs between the track for moving from the charging station and the track for returning, which can lead to inaccurate navigation and work execution.
Innovation Solution
An autonomous work machine equipped with magnetic detection sensors and a specification unit that compares detection results to specify the angle with respect to the charging station, allowing for precise angle determination when moving between the charging station and the work area, thereby correcting any map deformations and ensuring accurate navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the width of dockable angle is formed to have a predetermined allowance, then the autonomous work machine can dock with the charging station even if it enters diagonally, but the angle of the autonomous work machine with respect to the charging station cannot be accurately specified
Solution Approach 1:
The patent employs feedback by using magnetic detection sensors to detect the magnetic field generated by the station wire, and the specification unit continuously monitors and adjusts the autonomous work machine's angle based on the detected magnetic field strength, enabling accurate angle specification despite the wide dockable angle range
Solution Approach 2:
The patent replaces mechanical angle measurement methods with a magnetic field-based detection system. The magnetic detection sensors detect the magnetic field from the station wire, and the specification unit calculates the angle based on magnetic field strength comparisons, eliminating the need for mechanical angle sensors
2Adaptability or versatility
If a shift in angle between track for moving from charging station and track for returning occurs, then the autonomous work machine can accommodate track variations, but the area map becomes deformed and work accuracy deteriorates
Solution Approach 1:
The specification unit uses feedback from magnetic detection sensors to continuously monitor the autonomous work machine's angle during movement. By comparing magnetic field strengths detected by multiple sensors, the system calculates angle shifts and compensates for track deviations, preventing area map deformation
Solution Approach 2:
The patent introduces the magnetic field from the station wire as an intermediary reference. The magnetic detection sensors detect this magnetic field, and the specification unit uses it as a stable reference to calculate and correct angle shifts, ensuring accurate area map generation even when tracks shift
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 solution enables accurate specification of the autonomous work machine's angle with respect to the charging station, improving position recognition and ensuring correct map recognition even when track shifts occur, thus enhancing the machine's ability to perform tasks accurately.
Implementation Method 1
a plurality of magnetic detection sensors each configured to detect a magnetic field during energization of a station wire
Data Source
AI summary
An autonomous work machine that works in a work area while autonomously traveling in the work area, comprises a plurality of magnetic detection sensors each configured to detect a magnetic field during energization of a station wire which is configured to guide the autonomous work machine to a charging station for power supply, and a specification unit configured to specify, when the autonomous work machine is to move from a charging position of the charging station to the work area or when the autonomous work machine is to move from the work area to the charging position, an angle of the autonomous work machine with respect to the charging station based on a comparison of detection results of the magnetic detection sensors.