Robotic Mower Boundary Sensing System for Distance Measurement
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Solution Overview
Problem
Existing robotic lawn mowers lack an accurate and reliable method to determine their distance from the boundary wire, which is crucial for efficient navigation and operation.
Innovation Solution
A boundary sensing system comprising a boundary driving circuit on a charging station that transmits encoded signals on a boundary wire, and four boundary sensors on the robotic mower, which use signal strength to calculate distance and angular orientation relative to the wire, with a vehicle control unit processing this information to control the mower's movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a boundary sensing system uses signal strength to determine distance, then measurement precision is improved, but device complexity increases due to multiple sensors and signal processing requirements
Solution Approach 1:
The boundary sensing system is divided into four separate boundary sensors positioned at different locations on the robotic mower. Each sensor independently measures signal strength from the boundary wire, allowing the system to determine both distance and angular orientation through comparative analysis of the four sensor readings.
Solution Approach 2:
The boundary sensing system serves multiple functions simultaneously: it determines the distance to the boundary wire, calculates the angular orientation relative to the wire, and provides data for both navigation and area coverage optimization. This multi-functionality reduces the need for separate sensing systems.
2Measurement precision
If the robotic mower uses four boundary sensors to determine angular orientation, then navigation precision is improved, but ease of operation deteriorates due to complex signal processing requirements
Solution Approach 1:
The vehicle control unit continuously receives signal strength readings from all four boundary sensors and uses this feedback to calculate angular orientation and adjust the mower's navigation in real-time. This closed-loop feedback system automates the complex signal processing, making the system easy to operate while maintaining high precision.
3Reliability
If the boundary driving circuit transmits encoded signals on the boundary wire, then reliability of boundary detection is improved, but use of energy increases due to continuous signal transmission
Solution Approach 1:
The boundary driving circuit transmits encoded signals in periodic pulses rather than continuous waves. This periodic transmission maintains reliable boundary detection capability while significantly reducing energy consumption compared to continuous signal transmission.
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
Enables the robotic mower to accurately determine its proximity and orientation to the boundary wire, allowing for efficient navigation, area coverage, and preventing turf damage by ensuring precise boundary following and obstacle detection.
Implementation Method 1
a boundary sensor on a robotic mower and including an inductor receiving the encoded signal
Data Source
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AI summary
A robotic mower boundary sensing system includes a boundary driving circuit on a charging station (105) transmitting an encoded signal on a boundary wire (103, 104); a boundary sensor (119) on a robotic mower (100) and including an inductor receiving the encoded signal; and a vehicle control unit (101) on the robotic mower (100) receiving the encoded signal from the boundary sensor (119) and decoding the signal and determining the distance of the boundary sensor (119) to the boundary wire (103, 104).