Robotic Work Tool Motion Control for Low-Impact Lawn Traversal
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Solution Overview
Problem
Robotic lawn mowers continue to leave tracks and cause damage to grass due to insufficient reduction in physical impact, despite existing methods like speed restriction, as the actual forces imparted on the surface are not adequately addressed.
Innovation Solution
A robotic work tool with a controller that detects increased risk areas and reduces acceleration and turning degree, using sensors for slope detection, moisture levels, wheel slip, and stored location data to adapt power levels to motors and adjust operation to minimize impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the speed of the robotic lawn mower is restricted to reduce physical impact on the lawn, then the damage to grass is reduced, but the tracks and wear on the lawn are not sufficiently prevented
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting acceleration and speed parameters based on detected environmental conditions. The controller modifies motion parameters (acceleration, speed) in real-time according to slope, moisture, and location data, rather than using fixed speed restrictions. This resolves the contradiction by enabling efficient mowing in safe areas while preventing damage in vulnerable areas.
Solution Approach 2:
The patent implements dynamics by transitioning from static speed restriction to dynamic acceleration control. The robotic lawn mower continuously adapts its motion characteristics based on real-time sensor feedback and stored location data, adjusting acceleration rates and speed profiles according to the specific conditions of each area being traversed. This dynamic approach optimizes both productivity and grass protection.
2Object-affected harmful factors
If the robotic work tool reduces acceleration in high-risk areas, then the physical impact on the surface is reduced, but the time to complete the work area increases
Solution Approach 1:
The patent applies local quality by implementing spatially differentiated motion control. Different acceleration and speed profiles are applied to different locations within the work area based on stored location data and risk assessment. High-risk areas (steep slopes, wet surfaces) receive reduced acceleration, while safe areas maintain normal operation parameters, thus minimizing overall time loss while protecting vulnerable surfaces.
Solution Approach 2:
The patent implements preliminary action by pre-storing location data and risk characteristics of different areas before operation. The controller uses this pre-acquired information to proactively adjust acceleration and speed before entering high-risk zones, rather than reacting after damage occurs. This preliminary preparation enables smooth transitions and minimizes time penalties.
3Manufacturing precision
If the robotic work tool uses multiple sensors and control mechanisms to detect and respond to high-risk areas, then the precision of impact reduction is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional controller that integrates multiple sensor inputs (slope sensors, moisture sensors, location data) and coordinates multiple control outputs (acceleration control, speed regulation, turning degree adjustment). This single controller performs diverse functions including navigation, environmental sensing, risk assessment, and motion control, reducing overall system complexity despite the multiple sensing and control requirements.
Data Source
AI summary
A robotic work tool (100) comprising a controller (110), the controller (110) being configured to determine that an area, where there is an increased risk of impact to a surface travelled, is entered by the robotic work tool (100); and in response thereto reduce an acceleration utilized by the robotic work tool (100).