Robotic Lawnmower Navigation Switching Near Boundary Wires
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Robotic lawnmowers face reduced navigation accuracy in areas with poor satellite reception, and traditional boundary wires are cumbersome to install and maintain.
Innovation Solution
Combining satellite-based navigation with a wire-based navigation system, where the robotic lawnmower uses magnetic sensors to determine its distance from a virtual boundary and a physical boundary wire, switching between navigation methods based on distance thresholds to ensure accurate and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If satellite-based navigation is used for robotic lawnmower operation, then ease of operation and automation are improved, but measurement precision deteriorates in areas with poor satellite reception
Solution Approach 1:
The operational area is segmented into multiple zones based on satellite reception quality. The controller divides the mowing area into high-confidence zones (good satellite reception) and low-confidence zones (poor satellite reception), applying different navigation strategies to each segment. This allows the system to maintain high automation while ensuring precision in critical areas.
Solution Approach 2:
A boundary wire system is introduced as an intermediary reference between the satellite navigation system and the physical environment. The wire-based electromagnetic field serves as a mediator that provides absolute position reference in areas where satellite signals are insufficient, bridging the gap between GPS navigation and precise boundary adherence.
2Measurement precision
If traditional boundary wires are installed throughout the operational area, then measurement precision and reliability are improved, but ease of manufacture and device complexity worsen due to cumbersome installation
Solution Approach 1:
Instead of uniformly installing boundary wires throughout the entire operational area, the system applies wire-based navigation locally only in areas where satellite reception is insufficient. The controller dynamically determines which zones require wire-based reference, reducing installation complexity while maintaining precision where needed.
Solution Approach 2:
The system uses partial boundary wire installation rather than complete coverage. By installing wires only in critical zones with poor satellite reception and using satellite navigation in open areas, the system achieves sufficient precision without the excessive installation effort required for complete wire coverage.
3Measurement precision
If wire-based navigation is used exclusively, then measurement precision is improved, but ease of operation deteriorates due to inability to operate in shadowed areas without physical wires
Solution Approach 1:
The system merges satellite-based navigation and wire-based navigation into a hybrid system. The controller integrates both navigation methods, using satellite GPS for general positioning in open areas and wire-based electromagnetic field detection for precise boundary following in shadowed areas. This combination provides both ease of operation and measurement precision across all operational conditions.
Solution Approach 2:
The navigation system dynamically switches between satellite-based and wire-based modes based on real-time signal quality assessment. When satellite reception is good, the system operates in satellite mode for ease of operation. When reception deteriorates, it transitions to wire-based mode to maintain precision, creating a dynamic adaptive navigation system.
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 hybrid system allows the robotic lawnmower to operate safely and accurately in areas with low satellite reception while providing a secure, easy-to-install physical boundary, maintaining high precision where needed.
Implementation Method 1
the robotic lawnmower comprising one or more magnetic sensors
Data Source
AI summary
A robotic lawnmower system comprising a boundary wire and a robotic lawnmower arranged to operate in an operational area bounded by a virtual boundary, the robotic lawnmower comprising one or more magnetic sensors, one or more satellite navigation sensors and a controller, wherein the controller is configured to: cause the robotic lawnmower to operate in the operational area according to the virtual boundary based on the one or more satellite navigation sensors, determine that the robotic lawnmower is approaching the boundary wire, determine a boundary location, determine a distance (d) between the virtual boundary and the boundary wire at the boundary location, compare the determined distance (d) to a mode determination distance (D), and if the determined distance (d) is greater than the mode determination distance D, the robotic lawnmower is configured to cross the boundary wire and continue operating within the virtual boundary, or if the determined distance (d) is less than the mode determination distance, the robotic lawnmower is configured to continue to operate within the boundary wire.