Gas Hob Thermocouple Pot Detection for Burner Power Reduction
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Solution Overview
Problem
Existing gas hob technologies fail to reliably detect the removal of pots and adjust gas burner output accordingly, leading to inefficiencies in gas consumption and requiring manual intervention for re-ignition.
Innovation Solution
A detection means, such as a thermocouple or ionization electrode, is positioned to directly experience the flames or hot gas flow, allowing for continuous signal evaluation to differentiate between pot presence and absence, enabling automatic reduction of gas burner power or complete shutdown, and facilitating efficient re-ignition when the pot is replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monitoring electrode is positioned at a large distance from the burner, then the ionization current is interrupted when the pot is removed, but the detection reliability is reduced because the flame pattern only heats the electrode when the pot is present
Solution Approach 1:
A thermocouple is introduced as an intermediary sensing element positioned between the flame and the monitoring electrode. The thermocouple directly measures flame temperature and transmits this information to the control unit, which then modulates the monitoring electrode's sensitivity. This mediator resolves the contradiction by enabling precise temperature detection while maintaining reliable pot removal detection through signal processing.
Solution Approach 2:
The system dynamically adjusts the monitoring electrode's detection threshold based on real-time flame temperature measurements from the thermocouple. When the flame temperature indicates the pot is present, the system lowers the detection threshold; when temperature drops indicating pot removal, the threshold is raised. This dynamic adaptation maintains high reliability across varying cooking conditions.
2Productivity
If the gas burner is continuously operated at high power output, then cooking performance is maintained, but gas consumption increases unnecessarily when the pot is removed
Solution Approach 1:
The system implements continuous feedback by monitoring flame temperature via the thermocouple and automatically adjusting the gas valve position based on pot presence detection. When the pot is detected as present, the burner operates at the selected high power output for optimal cooking performance. When pot removal is detected, the system immediately reduces power to minimum or shuts off completely, eliminating wasteful gas consumption while maintaining cooking productivity when needed.
Solution Approach 2:
The gas burner power output is dynamically adjusted in real-time based on pot presence detection. The system transitions between high power output (when pot is present) and minimum/zero power output (when pot is removed), optimizing the balance between cooking performance and energy conservation without manual intervention.
3Reliability
If manual intervention is required for re-ignition after pot removal, then safety is maintained, but operational convenience is reduced
Solution Approach 1:
The system performs preliminary safety verification by detecting pot presence through flame temperature monitoring before allowing re-ignition. When the user places a new pot on the burner, the thermocouple detects the restored flame temperature pattern, and the control unit automatically enables re-ignition. This preliminary check maintains safety while eliminating the need for manual intervention, significantly improving operational convenience.
Solution Approach 2:
The system provides self-service by automatically detecting when a pot has been replaced and enabling re-ignition without user intervention. The thermocouple continuously monitors flame characteristics, and when pot presence is confirmed, the control unit automatically permits the burner to be reignited, making the system serve itself and improving ease of operation while maintaining safety protocols.
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 ensures reliable detection of pot removal and re-addition, minimizing gas consumption, reducing manual intervention, and maintaining operational readiness while optimizing energy use.
Implementation Method 1
detection means, such as a thermocouple or ionization electrode, is positioned to directly experience the flames or hot gas flow
Implementation Method 2
detection means, such as a thermocouple or ionization electrode, is positioned to directly experience the flames or hot gas flow
Data Source
Figure 1
AI summary
In a method for detecting pots on a gas hob with a gas burner, a thermocouple for flame detection is attached to the gas hob in such a way that the flame is applied to it at every continuously possible output of the gas burner. In order to detect whether a pot is placed on the gas hob with the gas burner in operation or whether the pot has been removed, the thermal voltage is tapped at the detection means and evaluated by comparing the current signal with the signal when the pot is placed. When the pot is on, there is a different flame at the thermocouple than when the pot is removed, and the temperature is different. In response to detecting the removal of the pot, the power on the gas hob is reduced.