Intelligent Lawn Mower Torque-Based Speed Control for Dense Grass
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Solution Overview
Problem
Conventional intelligent lawn mower control methods lead to reduced mowing quality and shortened mowing motor service life due to increased resistance from deep or dense grass, causing excessive current and overheating.
Innovation Solution
A method and apparatus that detect output torque of the mowing motor and adjust the wheel rotation speed by reducing it when the torque reaches a set threshold, while allowing it to increase when the torque drops below a second threshold, using set acceleration and deceleration slopes, and replanning the moving path as necessary to maintain optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant mowing speed and traveling speed are used, then the intelligent lawn mower can operate simply, but the blade rotation speed decreases and mowing quality deteriorates when resistance increases
Solution Approach 1:
The patent implements dynamic speed adjustment by detecting motor current and torque in real-time, then automatically adjusting wheel rotation speed and traveling speed based on detected resistance conditions. This transforms the static constant-speed control into a dynamic adaptive control system that maintains optimal blade rotation speed under varying load conditions, resolving the contradiction between control simplicity and mowing quality.
Solution Approach 2:
The system employs feedback control by continuously monitoring motor current, torque, and blade rotation speed, then using this information to adjust wheel speed and traveling speed. The feedback loop ensures that when resistance increases (detected via current/torque), the system automatically reduces wheel speed to maintain blade speed, thereby maintaining mowing quality without complex manual intervention.
2Productivity
If constant traveling speed is maintained, then the lawn mower operates efficiently, but the mowing motor overheats and service life shortens when torque exceeds threshold
Solution Approach 1:
The patent dynamically adjusts traveling speed based on real-time torque detection. When motor torque exceeds a predetermined threshold, the system automatically reduces traveling speed to lower the mechanical load on the motor, preventing overheating and extending motor service life. This dynamic speed adjustment maintains acceptable productivity while protecting the motor from damage.
Solution Approach 2:
The system implements preventive protection by monitoring motor torque and current before overheating occurs. When torque approaches the threshold, the system proactively reduces wheel speed and traveling speed to prevent excessive current and overheating, thereby cushioning the motor from damaging conditions and extending its service life.
3Reliability
If wheel rotation speed is reduced to protect motor components, then motor overheating is prevented, but blade rotation speed decreases and mowing quality suffers
Solution Approach 1:
The patent implements coordinated dynamic control of both wheel rotation speed and traveling speed. When motor torque exceeds the threshold, the system reduces wheel rotation speed to maintain blade rotation speed within the optimal range, while simultaneously adjusting traveling speed to match the reduced wheel speed. This coordinated dynamic adjustment ensures motor protection is achieved without compromising mowing quality.
Solution Approach 2:
The system changes multiple operating parameters simultaneously - reducing wheel rotation speed while maintaining blade rotation speed through proportional reduction in traveling speed. This parameter coordination ensures that motor protection (via reduced wheel speed) does not result in poor mowing quality (via reduced blade speed), as both parameters are adjusted in a coordinated manner.
Data Source
AI summary
This application relates to a method and an apparatus for controlling an intelligent lawn mower, an intelligent lawn mower, a computer device, and a storage medium. In the method, output torque of a mowing motor during working of the intelligent lawn mower is detected, a wheel rotation speed of the intelligent lawn mower is reduced in response to the output torque reaches a first set threshold, and the intelligent lawn mower is controlled to operate based on the reduced wheel rotation speed.