Inertial Guidance for Outdoor Power Tools
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Solution Overview
Problem
Outdoor power equipment, such as mowers and chainsaws, face challenges in achieving precision cuts and measurements due to insufficient accuracy from commercially available GPS systems, especially in small areas requiring small tolerances, leading to a need for improved measurement and guidance methods.
Innovation Solution
Incorporating inertia-based sensors, including accelerometers and gyroscopes, to provide movement information and feedback to operators, allowing for precise measurements and guided cuts without external tools, using onboard electronics and processing circuitry to track movement relative to reference points and provide feedback through visual, audible, or tactile indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPS guidance is used for outdoor power equipment, then guidance capability is provided, but measurement precision is insufficient for small areas requiring small tolerances
Solution Approach 1:
The patent replaces GPS-based electronic guidance with an inertia-based measurement system using mechanical sensors (accelerometers and gyroscopes) to detect movement. This substitution provides higher measurement precision for small-area operations while maintaining ease of operation through automated sensor-based tracking relative to reference points
Solution Approach 2:
The patent changes the measurement parameters from GPS coordinates (low precision for small areas) to inertial measurement data (high precision for small displacements). By using accelerometers and gyroscopes to capture subtle movements and comparing them against stored reference point data, the system achieves the required measurement accuracy for precision work
2Measurement precision
If operator skill and external tools are used for precision work, then measurement capability is achieved, but device complexity increases
Solution Approach 1:
The outdoor power equipment performs measurements independently using onboard inertia sensors. The system automatically detects movement, compares it to reference points stored in memory, and provides feedback without requiring external measuring tools or additional equipment, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent integrates multiple functions into the outdoor power equipment itself: the inertia sensors serve both as movement detectors and as measurement devices, the processor both controls operation and performs measurement calculations, and the memory both stores reference points and measurement data. This multi-functionality eliminates the need for separate external tools
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 operators to make precise measurements and cuts with increased accuracy and ease, eliminating the need for external devices, thereby enhancing the precision and efficiency of outdoor power equipment operations.
Implementation Method 1
an accelerometer that detects acceleration of the chainsaw
Implementation Method 2
a gyroscope that detects angular velocity of the chainsaw
Data Source
AI summary
An outdoor power tool may include an engine, a working assembly that performs a cutting operation powered by the engine, movement sensor circuitry configured to at least determine movement information of the outdoor power tool using inertia based measurements locally determined at the outdoor power tool, and a position monitoring module including processing circuitry configured to receive the movement information and receive an input defining a reference point. The position monitoring module may be further configured to provide feedback to an operator of the outdoor power tool to direct operation of the outdoor power tool based on the movement information.