Hob Control Device for Temperature Gradient Safety
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Solution Overview
Problem
Household hobs pose risks due to high heat generation, requiring constant monitoring, which can be hazardous for users with impaired vision, hearing, smell, temperature sensitivity, or sense of time, as existing technologies do not adequately adapt to users' monitoring abilities.
Innovation Solution
A hob with a control element and protective device that allows users to set a maximum temperature and temperature gradient for each cooking zone, using a modification parameter to regulate the energy supply to the heating element, ensuring safe operation even for users with reduced monitoring abilities, with optional secure input interfaces like rotary wheels or radio receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating element is controlled to provide high heating power, then the heating efficiency is improved, but the risk of excessive temperature and fire hazard increases
Solution Approach 1:
The control device pre-limits the maximum temperature and temperature gradient before dangerous conditions can occur. By setting predetermined thresholds for maximum temperature and temperature rise rate, the system prevents fire hazards proactively rather than reacting after danger arises.
Solution Approach 2:
The control device continuously monitors the heating element's temperature and adjusts the power supply in real-time based on feedback from temperature sensors. This closed-loop control ensures the heating element operates within safe temperature and temperature gradient limits while maintaining efficient heating when conditions permit.
2Productivity
If the heating element is controlled to heat up quickly, then the productivity is improved, but the temperature gradient becomes too steep causing safety risks
Solution Approach 1:
The system pre-establishes a maximum temperature gradient threshold to prevent unsafe heating rates. By calculating and limiting the rate of temperature change before excessive gradients occur, the system maintains productive heating while preventing safety risks associated with rapid temperature changes.
Solution Approach 2:
The control device dynamically adjusts the power supply to the heating element based on real-time temperature measurements. The system allows aggressive heating when safe, but automatically modulates power delivery when approaching temperature gradient limits, creating a dynamic balance between productivity and safety.
3Reliability
If the maximum temperature is limited to ensure safety, then the fire risk is reduced, but the heating performance deteriorates
Solution Approach 1:
The control device applies partial power limitation only when necessary to maintain safety. By allowing the heating element to operate at full power within safe temperature and temperature gradient boundaries, the system achieves adequate heating performance for most cooking tasks while preventing fire hazards. Excessive power is applied only when conditions permit safe operation.
Solution Approach 2:
The system changes the operating parameters of the heating element dynamically. Rather than imposing a fixed temperature ceiling that would always limit performance, the control device adjusts power delivery based on real-time conditions, maintaining optimal heating performance when safe and reducing power only when temperature or temperature gradient thresholds are approached.
4Reliability
If constant monitoring is required to ensure safety, then the fire hazard is reduced, but the ease of operation deteriorates for users with impaired monitoring abilities
Solution Approach 1:
The control device performs self-monitoring of temperature and temperature gradient, automatically adjusting power delivery without requiring user intervention or constant attention. The system serves itself by continuously sensing conditions and modulating heating power, thereby ensuring fire hazard reduction while completely relieving the monitoring burden from the user.
Solution Approach 2:
The control device implements automatic feedback control by continuously monitoring heating element temperature and adjusting power supply accordingly. This closed-loop system eliminates the need for user monitoring by making the safety functions autonomous, allowing users with impaired monitoring abilities to operate the hob safely without constant attention.
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 operational safety and ease of use by preventing excessive temperatures and rapid heating, significantly reducing the risk of fire and allowing for individual adjustment based on the user's monitoring capabilities.
Implementation Method 1
a heating element (207) and a control device (210) for controlling an energy supply to the heating element (207)
Data Source
Figure 1~2
Figure 3~4
AI summary
A cooktop (110) is presented, comprising a heating element (207) and a control element (155) for inputting a control parameter (215) for a heating element (207) of at least one cooking zone (115). The cooktop (110) further comprises a protective device (210) for modifying the control parameter (215) and for outputting a modified control parameter (230) to the heating element (207) in order to control the heating element (207) such that the heating element (207) is heated to a maximum defined temperature (334) and/or that the heating element (207) is heated with a maximum defined temperature gradient (335).