Radar-Controlled Appliance Door Opening With Fewer False Activations
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Solution Overview
Problem
Existing household appliances face challenges in reliably controlling door opening mechanisms using sensors, as current solutions are prone to false activations, limited design flexibility, and increased costs due to complex sensor setups and vulnerability to moisture and dirt.
Innovation Solution
A household appliance equipped with a highly integrated radar sensor that detects movement and direction, allowing for precise control of the opening mechanism, is designed with the radar sensor housed in a protected area to prevent interference and maintain a sleek design, enabling reliable operation and multiple control options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an infrared sensor is used to detect approaching persons, then the door can be automatically opened, but false activation by pets or non-human objects cannot be prevented and the sensor housing requires special materials that do not impede infrared signals
Solution Approach 1:
The patent changes the detection parameter from infrared radiation (thermal signature) to radar waves (motion detection). Radar sensors detect the movement and velocity of objects through Doppler effect, allowing differentiation between stationary pets and moving humans, thereby preventing false activations while maintaining automatic door opening functionality
Solution Approach 2:
The patent replaces the infrared sensor system with a radar sensor system. This substitution eliminates the need for special housing materials that must transmit infrared signals, as radar waves can penetrate common housing materials, simplifying the sensor housing requirements while improving reliability
2Reliability
If the proximity sensor is integrated into the door or body surface, then the sensor is protected from moisture and dirt, but the surface is optically interrupted and design freedom is limited
Solution Approach 1:
The patent replaces optical sensors (infrared, ultrasonic) with a radar sensor that emits and receives electromagnetic waves. This substitution allows the sensor to be integrated into the door or body surface without requiring optical transparency, as radar waves can penetrate common housing materials, thus maintaining design freedom while protecting the sensor
Solution Approach 2:
The patent changes the detection method from optical to electromagnetic wave detection. This parameter change allows the sensor to be housed in opaque materials that protect against moisture and dirt, eliminating the need for optical interruptions in the surface design
3Ease of operation
If the proximity sensor is placed at eye level on the door front, then the sensor can detect approaching persons, but the sensor is mounted conspicuously and significantly impairs the visual impression of the appliance
Solution Approach 1:
The patent moves the sensor placement from the vertical dimension (eye level on front surface) to the horizontal dimension (integrated into the housing structure). The radar sensor can be positioned in less conspicuous locations such as the side panels or integrated into the handle area, maintaining detection capability while improving aesthetic appearance
4Ease of operation
If ultrasonic sensors with separate transmitter and receiver are used, then movement detection can be achieved, but the separate components require considerable space and increase overall cost
Solution Approach 1:
The patent merges the transmitter and receiver into a single integrated radar sensor unit. This consolidation eliminates the need for separate component mounting, reducing space requirements and simplifying the overall device structure while maintaining movement detection functionality
Solution Approach 2:
The radar sensor performs multiple functions (transmission, reception, signal processing) within a single integrated component, eliminating the need for separate ultrasonic transmitter and receiver units, thereby reducing device complexity and space requirements
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
The radar sensor provides high sensitivity and adjustable detection, allowing for reliable and energy-efficient operation, accommodating various design requirements and enhancing usability for individuals with physical disabilities by enabling handle-free and visually appealing appliance designs.
Implementation Method 1
the proximity sensor is a radar sensor
Data Source
Figure 1
Figure 2
AI summary
The household appliance (1) comprises housing (2) and doors (3,4) that are connected with the housing. An aperture mechanism (5) affects the doors. The proximity sensors (6) generate a control signal for controlling the aperture mechanism. The proximity sensors are radar detectors. An independent claim is included for method for automated opening of door of household appliance.