Adaptive Lawnmower Cutting Control for Battery Run Time
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Solution Overview
Problem
Lawnmowers powered by DC batteries face the challenge of battery discharge during operation, leading to discomfort for operators who worry about completing their mowing job before the batteries run out, necessitating a solution to enhance battery power management and ensure sufficient power for the desired duration.
Innovation Solution
An adaptive cutting system that adjusts cutting height and ground speed based on battery state of charge and estimated run time, using a controller to manage power consumption and extend the usable time of the lawnmower.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the lawnmower operates at high power consumption settings, then the productivity and cutting speed are improved, but the battery discharge time increases leading to insufficient power for completing the mowing job
Solution Approach 1:
The system dynamically adjusts cutting height and ground speed based on real-time battery state of charge and estimated run time calculations. The controller continuously monitors battery voltage and current draw, then automatically modifies operational parameters to optimize the balance between productivity and duration, allowing the lawnmower to adapt its performance characteristics during operation rather than maintaining fixed settings
Solution Approach 2:
The system implements a feedback loop where the controller receives continuous data from battery voltage sensors and run time estimators, processes this information to determine current power consumption levels, and automatically adjusts cutting height and ground speed accordingly. This closed-loop control ensures the lawnmower maintains optimal performance while preventing battery depletion before job completion
2Manufacturing precision
If the cutting height is lowered to improve cutting quality, then the manufacturing precision is improved, but the power consumption increases reducing the battery run time
Solution Approach 1:
The system changes the cutting height parameter dynamically based on battery state of charge and run time estimates. When power consumption becomes excessive relative to the desired run time, the controller automatically raises the cutting height to reduce the mechanical load and power draw from the battery, thereby extending operational duration while maintaining acceptable cutting quality
3Productivity
If the ground speed is increased to improve productivity, then the productivity is improved, but the power consumption increases leading to shorter battery run time
Solution Approach 1:
The system dynamically adjusts ground speed based on real-time battery state of charge and run time calculations. The controller continuously monitors power consumption and automatically modifies drive assembly speed to optimize the balance between productivity and duration, allowing the lawnmower to vary its travel speed during operation rather than maintaining a constant high speed
Data Source
AI summary
An adaptive cutting system for a electric lawnmower including a battery, a motor, a controller, a drive assembly, and a blade. The controller can be configured to adjust at least one of a cutting height of the blade and a ground speed output by the drive assembly based on a predetermined run time and a state of charge of the battery.