Kitchen Appliance Automatic Shutdown via Motor Idle Detection
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Solution Overview
Problem
Modern kitchen appliances lack an effective automatic shut-off mechanism for mechanical operating modes such as chopping, grating, and kneading, which can lead to unnecessary electricity consumption and safety hazards if not properly switched off.
Innovation Solution
A switch-off device with a time measuring device, control and regulation unit, and operating mode memory that automatically switches off the kitchen appliance when the maximum processing time for a mechanical operating mode is reached, using either power or weight measurements to determine idle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the kitchen appliance operates in mechanical operating modes (chopping, grating, kneading), then food processing functionality is provided, but the appliance may remain powered on unnecessarily after processing completes, leading to increased electricity consumption and safety hazards
Solution Approach 1:
The control and regulation unit continuously monitors the operational state of the electric motor and compares it against stored maximum processing times for different mechanical operating modes. When the motor operates at idle or virtually at idle for an extended period, indicating processing completion, the system automatically shuts down the appliance, preventing unnecessary energy consumption and safety hazards
Solution Approach 2:
The shutdown device autonomously determines when mechanical processing is complete by monitoring motor operation patterns and automatically initiates shutdown without user intervention. The system serves itself by detecting its own operational state and taking appropriate action to conserve energy and ensure safety
2Loss of energy
If the appliance automatically shuts off after a predetermined period of inactivity, then energy is saved, but the shutdown timing must be precisely determined to avoid shutting off during active processing or failing to shut off when processing is complete
Solution Approach 1:
The system continuously monitors motor operation patterns and uses this feedback to determine when processing is complete. By comparing real-time motor state against stored maximum processing times for different operating modes, the system achieves precise shutdown timing that adapts to actual processing conditions rather than relying on fixed predetermined periods
Solution Approach 2:
The operating mode memory pre-stores maximum processing times for various mechanical operating modes (chopping, grating, kneading, etc.), allowing the control unit to have reference values ready before processing begins. This preliminary preparation enables accurate comparison during operation for precise shutdown timing
3Reliability
If maximum processing times are pre-stored in the operating mode memory for each mechanical operating mode, then automatic shutdown accuracy is improved, but the device complexity increases due to additional components (time measuring device, operating mode memory, control and regulation unit)
Solution Approach 1:
The control and regulation unit serves multiple functions: it monitors motor operation, determines processing completion, controls shutdown timing, and manages power supply. This multi-functionality reduces the need for separate dedicated components for each function, thereby reducing overall device complexity while maintaining shutdown accuracy
Solution Approach 2:
The time measuring device, operating mode memory, and control functions are integrated into a unified shutdown device system. By combining these elements into a coordinated system rather than separate independent components, the patent achieves accurate automatic shutdown while managing device complexity through functional integration
Data Source
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AI summary
Disclosed are an automatic shut-off device for an electromechanical kitchen appliance, in which at least one mechanical operating mode, preferably all operating modes, has a maximum processing time or maximum duration, wherein the kitchen appliance is automatically shut off when the maximum duration is reached, a kitchen appliance with an automatic shut-off device and a method for automatically shutting off an electromechanical kitchen appliance.