Lawn Mower Adaptive Mowing-Blade Speed Control for Low-Speed Energy Savings
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Solution Overview
Problem
Existing riding-type lawn mowers face issues with maintaining lawn mowing quality and reducing unnecessary energy consumption due to excessive mowing-blade rotation speeds, especially at lower speeds.
Innovation Solution
A lawn mower system that adjusts the upper limit value of mowing-blade rotation speed based on the moving speed, using a controller to ensure the mowing-blade rotation speed does not exceed a predetermined limit, thereby preventing excessive rotation and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mowing-blade rotation speed is maintained at a high constant speed, then the lawn mowing quality is improved, but the energy consumption increases unnecessarily when the vehicle moves at low speed
Solution Approach 1:
The patent applies dynamics by making the mowing-blade rotation speed variable rather than constant. The rotation speed is dynamically adjusted based on the vehicle's moving speed, allowing the system to adapt to different operating conditions. When the vehicle moves slowly, the blade speed is reduced to save energy; when the vehicle moves quickly, the blade speed increases to maintain cutting quality.
Solution Approach 2:
The patent changes the parameter of mowing-blade rotation speed based on the vehicle's moving speed parameter. By establishing a relationship between these two parameters (with an upper limit that decreases as vehicle speed decreases), the system optimizes energy consumption while maintaining adequate mowing quality across different operating speeds.
2Use of energy by moving object
If the mowing-blade rotation speed is reduced to save energy, then the energy consumption is reduced, but the lawn mowing quality deteriorates
Solution Approach 1:
The system dynamically adjusts the mowing-blade rotation speed to match the vehicle's moving speed. This dynamic adjustment ensures that the blade speed is never excessively high when the vehicle is moving slowly, preventing wasted energy consumption while maintaining sufficient cutting speed for quality mowing when the vehicle is in motion.
Solution Approach 2:
The patent establishes a parameter relationship where the upper limit of mowing-blade rotation speed is tied to the vehicle's moving speed. This parameter coupling ensures that energy is not wasted on high-speed blade rotation when the vehicle is stationary or moving slowly, while still allowing high blade speeds when the vehicle moves quickly enough to justify the energy expenditure for quality cutting.
3Ease of operation
If a fixed upper limit value for mowing-blade rotation speed is set, then the control is simple, but the system cannot adapt to different vehicle speeds and causes unnecessary energy consumption
Solution Approach 1:
The patent implements a dynamic control system where the upper limit value of mowing-blade rotation speed is not fixed but varies with the vehicle's moving speed. This dynamic approach maintains relative simplicity in control logic while significantly reducing unnecessary energy consumption by lowering the speed limit when the vehicle moves slowly.
Solution Approach 2:
The system changes the control parameter (upper limit value of mowing-blade rotation speed) based on another parameter (vehicle moving speed). This parameter adaptation allows the control system to remain relatively simple while achieving energy efficiency through automatic adjustment of the speed limit according to actual operating conditions.
Data Source
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AI summary
The present invention relates to a lawn mower (1) including a vehicle main body (3), a traveling motor (9) provided in the vehicle main body, the traveling motor being configured to drive a traveling drive wheel (4) and a mowing-blade motor (15) provided in the vehicle main body, the mowing-blade motor being configured to rotationally drive a mowing-blade (14) for lawn mowing. The mower also includes an upper limit value output unit (13c) configured to output an upper limit value (L1, L2, L3) of a mowing-blade rotation speed (R0, R1, R2, R3). The upper limit value output unit outputs the upper limit value of the mowing-blade rotation speed lower as the moving speed (V1, V2, V3) of the lawn mower decreases. Thereby, it is possible to reduce power consumption while retaining an efficient cutting quality.