Handheld Cutter Speed Control for Noise and Energy Reduction
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Solution Overview
Problem
Existing handheld driving apparatuses, such as brush cutters, impose a heavy burden on users due to noise and vibration during operation and require high energy consumption for high dynamic actions.
Innovation Solution
A control method for handheld driving apparatuses that adjusts the target speed levels based on load current thresholds and user burden, reducing noise and vibration by dynamically adjusting the target speed levels to match the operational state, thereby improving energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high drive output is maintained for high dynamic action, then cutting performance is improved, but noise and vibration increase placing heavy burden on user
Solution Approach 1:
The patent applies dynamics by making the drive output adjustable rather than fixed. The control unit dynamically changes the target rotational speed based on detected operational states (idling, cutting, high-load), allowing the system to adapt its performance characteristics to match actual working conditions, thereby reducing noise and vibration when full power is not needed.
Solution Approach 2:
The patent changes the parameter of rotational speed based on operational state. By detecting whether the apparatus is idling, cutting, or under high load, the control unit adjusts the target rotational speed parameter accordingly - maintaining high speed for cutting performance while reducing speed during idling or high-load conditions to minimize noise and vibration.
2Productivity
If high drive output is maintained for high dynamic action, then cutting performance is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts energy consumption by varying drive output according to actual operational needs. The control unit monitors operational state and modifies the target rotational speed in real-time, ensuring high energy consumption only when high cutting performance is required, while reducing energy consumption during idling or high-load conditions where full power is unnecessary.
Solution Approach 2:
The patent changes the energy consumption parameter by adjusting rotational speed based on operational state. During idling or high-load conditions, the control unit reduces the target rotational speed parameter, thereby lowering energy consumption while maintaining the ability to deliver high performance when actually needed for cutting operations.
3Object-affected harmful factors
If target speed level is frequently adjusted to reduce noise and vibration, then user burden is reduced, but control complexity increases
Solution Approach 1:
The patent implements feedback control where the control unit continuously detects the operational state (idling, cutting, high-load) and adjusts the target rotational speed accordingly. This closed-loop feedback mechanism automates the speed adjustment process, reducing noise and vibration without requiring complex manual control, as the system self-regulates based on detected conditions.
Solution Approach 2:
The control system performs self-service by automatically detecting operational state and adjusting target speed without user intervention. The control unit monitors its own operational conditions and makes appropriate speed adjustments to minimize noise and vibration, eliminating the need for complex user-operated controls while achieving the desired reduction in harmful factors.
Data Source
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AI summary
The present invention relates to a handheld driving apparatus for mowing or cutting, preferably a brush cutter (1) or a chainsaw. The driving apparatus comprises a container (11), an action unit (2) and a controller (73). The container is configured to extend from a rear side toward a front side where the action unit is provided and configured to be driven such as to mow or cut. The controller (73) is configured to in a driving step, drive the action unit by controlling a drive output to a target value (PV1), in a monitoring step (A102, A103), monitor a state or behavior of the drive output with respect to the target value (PV1) during the control in the driving step, and in an adjusting step (A104), adjust the target value (PV1) based on the state or the behavior during the monitoring. This reduces noise generation and improves energy efficiency.