Cooking appliance user control integrated with rate of movement detection
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Solution Overview
Problem
Cooking appliances face the challenge of unintentional operation of user controls, such as burner energization or heat level changes, due to accidental movements by users, pets, or children, which can lead to safety issues and unintended energy usage.
Innovation Solution
Incorporating sensors, like position sensors or flow meters, to detect the rate of movement of user controls, with a controller that determines if the movement meets an alert criterion, triggering alerts or preventing energization or heat level changes to prevent unintentional operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a control knob is made easily operable for users, then ease of operation is improved, but unintentional operation by pets or children increases
Solution Approach 1:
The patent changes the parameter of control operation from simple rotational movement to a two-stage operation requiring both rotation and activation (e.g., pushing a button or turning a wheel a specific number of times). This parameter change maintains ease of operation for intended users while preventing unintentional activation by pets or children who cannot perform the complex two-stage action.
Solution Approach 2:
The patent requires a preliminary action (first stage of operation) before the final activation (second stage). For example, the user must first rotate the control to a specific position and then push a button or complete additional rotations to activate the burner. This preliminary action sequence ensures intentional use while preventing accidental activation.
2Reliability
If a two-manual-operation protocol is implemented to prevent unintentional energization, then control reliability is improved, but operational complexity increases
Solution Approach 1:
The patent merges the control functions into a single integrated control assembly that combines the rotational control with an activation mechanism (button or wheel). This unified design achieves two-manual-operation reliability without requiring separate controls for each stage, thereby reducing overall system complexity while maintaining safety.
Solution Approach 2:
The control assembly serves multiple functions: it controls burner selection, regulates heat level, and provides intentional activation confirmation. By making the control mechanism multi-functional, the patent reduces the need for separate controls for each function, thereby reducing overall device complexity while maintaining reliable operation.
3Measurement precision
If sensors are added to detect rate of movement, then unintentional operation detection is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical sensing systems with simpler electronic sensors that can detect rotational speed and activation actions. These electronic sensors provide precise measurement of movement rate and operational intent with fewer moving parts and lower complexity than traditional mechanical switches or levers would require.
Solution Approach 2:
The control system uses its own operational characteristics (rotational speed, activation sequence) as the detection mechanism. The system monitors its own operation through integrated sensors that detect whether the control is being turned too quickly or activated in the proper sequence, eliminating the need for separate external detection devices and reducing overall system complexity.
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 solution effectively reduces unintentional appliance operations, enhancing user awareness and safety by distinguishing between intentional and unintentional control movements, thereby preventing unwanted energy usage and potential hazards.
Implementation Method 1
a sensor (e.g., a position sensor, a flow meter, etc.) to detect and measure a rate of movement of a user control
Implementation Method 2
the position sensor includes an encoder, a hall effect sensor, or a toothed wheel
Data Source
AI summary
A cooking appliance may use a sensor to sense a rate of movement of a user control and generate an alert when the rate of movement meets an alert criterion, thereby enabling detection of potential inadvertent movements of a user control.