Robot Lawn Mower Boundary-Wire Navigation for Full Area Coverage
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Solution Overview
Problem
Users face challenges in operating lawn mowers, leading to increased costs due to the need for manual operation, and existing automatic robot lawn mowers lack efficient region coverage and accurate position recognition without external sensors.
Innovation Solution
A lawn mower robot system that uses a boundary indication unit, such as a boundary wire, to define an operation region, derive an imaginary quadrangle, and perform pattern driving within this region, allowing efficient movement and lawn cutting by sensing the boundary and using a controller to determine specific points for navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a robot lawn mower operates without external sensors to reduce costs, then device complexity and cost are reduced, but position recognition accuracy and region coverage efficiency deteriorate
Solution Approach 1:
The patent replaces complex external sensor systems with an electromagnetic field-based boundary indication unit (boundary wire) that generates a guide field. The robot mower uses internal sensors to detect this field for position recognition and boundary detection, substituting mechanical/optical external sensing with an electromagnetic field guidance system that is simpler and more cost-effective while maintaining accurate position recognition.
Solution Approach 2:
The boundary indication unit acts as an intermediary between the user and the robot mower. Instead of requiring direct complex sensor interaction or external guidance systems, the boundary wire creates an electromagnetic field that mediates the communication of boundary information to the robot, enabling accurate position recognition and region coverage through field-based guidance.
2Device complexity
If the robot mower uses simple boundary following, then device complexity is reduced, but region coverage efficiency deteriorates due to non-driven regions
Solution Approach 1:
The patent implements dynamic navigation by allowing the robot mower to adapt its driving pattern based on real-time position recognition relative to the boundary indication unit. The controller dynamically adjusts the driving pattern (e.g., parallel driving, spiral driving, or random driving) according to the robot's position within the operation region, ensuring complete coverage without leaving non-driven regions while maintaining simple boundary following principles.
Solution Approach 2:
The system employs feedback mechanisms where the robot continuously detects its position relative to the boundary indication unit using internal sensors. This position information feeds back to the controller, which adjusts the driving pattern in real-time to ensure complete region coverage. The feedback loop enables the robot to recognize when areas have been covered and dynamically modify its path to eliminate non-driven regions.
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 minimizes non-driven regions, reduces position recognition errors, and efficiently covers the operation area without relying on external sensors, thereby reducing costs and operational burdens.
Implementation Method 1
a sensing portion which is configured to sense the boundary of the operation region
Data Source
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AI summary
The method for controlling a lawn mower robot includes acquiring coordinate information of a boundary wire defining an operation region, deriving an imaginary quadrangle having the operation region, determining coordinate points of the boundary wire which are respectively close to four vertexes of the quadrangle as four specific points, and allowing a main body of the robot to be driven inside the operation region through pattern driving after beginning from any one of the four specific points.