Appliance Door Opening Using 3-Axis Sensing to Reject Interference
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Solution Overview
Problem
Fully integrated household appliances without handles require improved methods to distinguish between user-intended door-opening commands and interference signals, as existing solutions often necessitate multiple sensors and complex assembly processes.
Innovation Solution
A three-axis sensor, such as a three-axis acceleration sensor, is used to detect door-opening commands by measuring signals in orthogonal directions, allowing for the differentiation between useful and interference signals, and is integrated into the door mechanism without a direct connection to the decorative panel, reducing assembly complexity and allowing for intuitive operation through knocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple physically segregated sensors are used to distinguish useful signals from interference signals, then the reliability of door-opening command detection is improved, but the device complexity and assembly work increase
Solution Approach 1:
The patent combines multiple sensing functions into a single door-opening sensor that integrates both acoustic signal detection and vibration detection capabilities. This single sensor simultaneously captures sound waves from user commands and mechanical vibrations from interference, eliminating the need for multiple physically segregated sensors while maintaining signal distinction reliability through software-based signal processing
2Measurement precision
If multiple sensors with separate wiring are installed to achieve satisfactory operation, then the measurement precision is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The door-opening sensor is designed as an integrated unit that combines multiple detection functions into a single component with unified wiring. This integration eliminates the need for separate wiring of multiple sensors, reducing assembly complexity and making the manufacturing process easier while maintaining precise signal detection capabilities through advanced signal processing algorithms
3Reliability
If a high actuation force is required to distinguish useful signals from interference signals, then the reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent replaces mechanical force-based signal distinction with an electronic sensing and software processing system. Instead of requiring high physical actuation force to differentiate signals, the system uses acoustic and vibration sensors combined with signal processing algorithms to reliably distinguish user commands from interference, allowing users to operate the door with gentle knocking or tapping motions
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
This solution enhances the reliability and cost-effectiveness of door-opening mechanisms in household appliances by accurately distinguishing between user commands and interference, enabling reliable operation with reduced assembly work and maintaining a high-grade appearance.
Implementation Method 1
A three-axis sensor, such as a three-axis acceleration sensor, is used to detect door-opening commands by measuring signals in orthogonal directions
Data Source
AI summary
A method for operating a door-opening mechanism of a household appliance includes: providing a first signal using a door-opening sensor; providing a second signal using the door-opening sensor; and providing a third signal using the door-opening sensor. A total signal is calculated based on the first, second and third signals so as to determine a spatial direction from which a signal source originates.