Electric Blower Control Unit Fixed Mode Trigger Switch
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Solution Overview
Problem
Cordless portable blowers require continuous constant operation of the trigger switch to maintain a consistent air flow rate, leading to finger fatigue and difficulty in grasping the device, and existing mechanical fixing solutions increase complexity and cost.
Innovation Solution
An electric working machine with a control unit that shifts to a fixed control mode based on a predetermined operation of a switching part, allowing continuous control of the motor without requiring constant operation of the input part, utilizing a micro-computer and tact switch to manage the motor's operation independently of the trigger switch's current state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical fixing means is provided to prevent the trigger switch from returning to initial position, then the trigger switch can be fixed at a constant position without continuous finger pressure, but the structure complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical fixing means with an electronic control system. The microcomputer detects the operation amount of the trigger switch and controls the motor accordingly, eliminating the need for mechanical fixation mechanisms. This substitution of mechanical system with electronic control resolves the contradiction by maintaining ease of operation while reducing device complexity
Solution Approach 2:
The system uses the trigger switch's own operation state to control the motor automatically. The microcomputer continuously monitors the trigger switch position and adjusts motor speed accordingly, making the system self-regulating without requiring external mechanical fixation or continuous manual intervention
2Manufacturing precision
If continuous constant operation of the trigger switch is required to maintain consistent air flow rate, then the air flow rate can be controlled precisely, but finger fatigue increases and grasping difficulty arises
Solution Approach 1:
The patent implements a feedback control system where the microcomputer continuously detects the trigger switch operation amount and adjusts motor speed accordingly. This closed-loop feedback mechanism maintains precise air flow rate control while eliminating the need for continuous manual pressure on the trigger switch, as the system automatically maintains the desired state
Solution Approach 2:
The patent replaces the mechanical continuous pressure requirement with an electronic control system that uses sensors and microcomputer processing to maintain consistent air flow rate automatically, reducing the physical burden on the operator while preserving control precision
Data Source
AI summary
An electric working machine including: an input part; a control unit configured to control a motor in accordance with an operation amount of the input part; and a switching part; wherein, when a predetermined operation is performed to the switching part, the control unit shifts to a fixed control mode in which the motor is controlled in accordance with an operation amount of the input part at the time when the predetermined operation is performed to the switching part, irrespective of an operation amount of the input part after the predetermined operation is performed to the switching part.