Appliance Knock Detection via Cabinet-Mounted Vibration Sensor
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Solution Overview
Problem
Existing appliances with see-through doors face issues in accurately sensing knock inputs due to high temperatures, limited sensor installation options, and complex design requirements, leading to operational errors and reduced aesthetic appeal.
Innovation Solution
A control method for appliances that uses a sensor assembly with a three-axis vibration sensor module installed on the cabinet, capable of distinguishing knock inputs from other vibrations, and controlling lights based on these inputs, while maintaining homogeneity of sound wave transfer and avoiding high-temperature areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is installed on the door to detect knock inputs, then knock detection function is enabled, but the sensor cannot operate properly due to high temperatures
Solution Approach 1:
The patent uses the cabinet body as an intermediary medium to transfer sound waves from the door to the sensor. The sensor is installed on the cabinet body rather than directly on the door, allowing it to detect knock inputs through sound wave transmission via the cabinet body while avoiding direct exposure to high temperatures on the door surface.
2Adaptability or versatility
If a manipulation switch is added to control the light, then light control function is enabled, but the number of manipulation switches increases causing aesthetic deterioration
Solution Approach 1:
The patent merges the light control function with the existing knock detection function. The same knock input that triggers the lamp also controls the light, eliminating the need for a separate manipulation switch. This integration maintains aesthetic appeal while providing full light control functionality.
3Measurement precision
If the sensor installation position is limited to maintain sound wave transfer homogeneity, then knock detection accuracy is improved, but the number of available installation positions is reduced
Solution Approach 1:
The cabinet body serves as an intermediary that allows the sensor to be installed in positions that maintain sound wave transfer homogeneity while providing flexibility in placement. The sound waves travel through the door and cabinet body structure, allowing the sensor to be positioned on the cabinet body rather than constrained to specific door locations.
4Adaptability or versatility
If multiple manipulation switches are provided for various functions, then functional versatility is improved, but ease of operation deteriorates due to user confusion
Solution Approach 1:
The patent implements multi-functionality where a single knock input operation controls multiple functions: it turns on the lamp, controls lighting duration, and can be manipulated differently (single knock vs. continuous knocking) to achieve different outcomes. This universal input method simplifies operation while maintaining functional versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of knock input detection, reduces operational errors, and allows for individual control of lights in multiple appliances, maintaining aesthetic appeal and functionality.
Implementation Method 1
a single medium needs to connect between the point of a knock and the point of the installation of a sensor such that sound waves caused by a knock reach the sensor
Implementation Method 2
a lamp that lights up the inside of an appliance
Data Source
AI summary
A control method of an appliance, including: the appliance includes a first unit that includes a first lamp, a first cavity, a first door and a first sensor; a second unit that includes a second lamp, a second cavity, a second door and a second sensor; and a controller that controls operations of the first unit and the second unit, includes sensing vibrations generated in any one of the first unit or the second unit by the first sensor and the second sensor; determining whether the sensed vibrations are caused by a knock, and when determining that the sensed vibrations are caused by a knock using the first sensor and the second sensor, transferring a knock-on signal to the controller; and comparing the knock-on signals received from the first sensor and the second sensor and determining which of the first unit or the second unit is given the knock by the controller, and outputting a lamp-on output signal to the first unit or the second unit in which the knock is generated by the controller.