Motor Driven Appliance Operation Detection Using Reference Signals
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Solution Overview
Problem
In electric power tools, the close arrangement of electronic components can lead to short circuits due to moisture or dust, causing erroneous operation detection and unnecessary lighting of the light source, as the microcomputer may incorrectly recognize trigger switch operation.
Innovation Solution
A motor-driven appliance with a lighting unit, operation detector, reference signal output unit, determination unit, and control unit is designed to accurately determine the operation of the motor-driven appliance by using reference signals in addition to operation detection signals, preventing erroneous recognition and unnecessary lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic components are arranged close to each other to promote miniaturization, then the device size is reduced, but short circuits may occur due to water or dust entering between components
Solution Approach 1:
The seal member is installed in advance between the operation detector and microcomputer to prevent water and dust from entering the space between closely arranged electronic components, thereby preventing short circuits before they can occur
Solution Approach 2:
A seal member is introduced as an intermediary element between the operation detector and microcomputer to block the passage of water and dust, allowing close arrangement of components while maintaining reliability
2Speed
If the microcomputer recognizes operation detection signals without verification, then the response speed is fast, but erroneous recognition occurs due to short circuits from moisture or dust
Solution Approach 1:
The determination unit verifies operation detection signals by checking multiple conditions (signal level, time duration, repetition) before confirming operation, providing feedback validation that prevents erroneous recognition while maintaining fast response
Solution Approach 2:
The seal member is installed in advance to prevent short circuits, ensuring that operation detection signals are not corrupted by moisture or dust, thereby maintaining both fast response and accurate detection
3Speed
If the lighting LED is turned on immediately upon detecting operation signal, then the lighting response is fast, but unnecessary lighting occurs due to erroneous detection from short circuits
Solution Approach 1:
The control unit uses feedback from the determination unit to verify whether operation detection signals are valid before activating the lighting LED, preventing unnecessary energy consumption while maintaining fast lighting response when legitimate operation occurs
Solution Approach 2:
The seal member prevents short circuits in advance, ensuring that operation detection signals are accurate, which allows the lighting to respond quickly without wasting energy on false activations
Data Source
AI summary
A motor driven appliance in one aspect of embodiments of the present disclosure comprises a light source, a lighting unit, a motor, an operation unit, an operation detector, a reference signal output unit, a determination unit, and a control unit. The operation detector detects that the operation unit is operated, and outputs an operation detection signal that indicates that the operation unit is operated. The reference signal output unit outputs at least one reference signal that can be used as a reference for determining whether the detection by the operation detector is normal. The determination unit determines whether the operation unit is actually operated based on the operation detection signal and the at least one reference signal. The control unit controls operation of the lighting unit based on the determination made by the determination unit.