Heating Timer Control With Short Default Shut-Off Periods
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Solution Overview
Problem
Existing heating devices with automatic shut-off features often have long predetermined safety times that pose a safety risk, especially when operated carelessly, and require special attention or knowledge to manage.
Innovation Solution
A heating device with a timer that sets a short standard heating period (10 minutes to 1 hour, preferably 30 minutes) for all heating sources, which can be manually changed and automatically enforces this period without user intervention, featuring a simple and user-friendly interface for extending the time and providing visual or auditory signals before shut-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a long predetermined safety time is set for automatic shut-off, then the heating device can complete cooking processes for various power levels, but the safety risk increases significantly when operated carelessly
Solution Approach 1:
The safety time is made dynamically adjustable rather than fixed. Users can extend the time by pressing buttons, and the system adapts between a short default safety period (10-60 minutes) and extended periods based on user input, resolving the contradiction between safety and cooking completion
Solution Approach 2:
The predetermined safety time parameter is changed from a long fixed value to a short default value (10-60 minutes), with the ability to extend it. This parameter change reduces safety risks while maintaining cooking versatility through user-initiated extensions
2Adaptability or versatility
If a long predetermined safety time is set, then various cooking levels can be accommodated, but user attention and knowledge are required to manage the timing
Solution Approach 1:
The system provides a default safety time that works automatically without user intervention for simple cases. Users only need to press a button to extend the time if needed, making the system self-sufficient for basic operation while allowing user control when necessary
Solution Approach 2:
The system pre-sets a reasonable default safety time (10-60 minutes) that covers most cooking needs. This preliminary action eliminates the need for users to calculate or set timing, reducing the attention and knowledge required while maintaining versatility
3Reliability
If a short predetermined safety time is set, then safety risk is reduced, but cooking processes may be interrupted before completion
Solution Approach 1:
The system uses a dynamic time extension mechanism where the safety period starts short for safety but can be extended by user input. This resolves the contradiction by providing both short default timing (safety) and extended timing capability (cooking completion)
Solution Approach 2:
The system provides feedback through warnings before automatic shut-off and allows user intervention to extend the time. This feedback loop ensures safety through short default timing while enabling cooking completion when users provide additional input
4Difficulty of detecting and measuring
If individual timer devices are set for each heating source, then each hotplate can be monitored independently, but the device complexity increases
Solution Approach 1:
A single timer device is designed to control multiple heating sources universally. The system applies the same short safety time (10-60 minutes) to all hotplates simultaneously, providing simplified operation and reduced complexity while maintaining adequate monitoring of individual sources
Data Source
Figure 1~2
AI summary
The heating device, e.g., a cooking stove, has at least one heating/cooking position, the heat source of which, for reasons of safety, is automatically shut off by means of a time switch device after a prespecified heating period following activation. According to the invention, when a heat source is switched on, the time switch device is set to a prespecified short regulated heating period which is the same for all heat sources. All heat sources are switched off according to this procedure, wherein the prespecified regulated heating period can preferably be changed only by manually activating another safety heating period.