Freezer Compartment Warning Mode Activation to Reduce False Alarms
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Solution Overview
Problem
Household refrigeration appliances with freezer compartments generate unnecessary warning signals when first turned on, as the freezer compartment is initially warm, leading to annoyance and potential false alarms due to the immediate temperature difference detection.
Innovation Solution
A household refrigeration appliance with a heat-insulated body, a refrigeration device, and an electronic control system that activates a temperature warning mode only after the appliance has been on for a predetermined time, ensuring the freezer compartment cools sufficiently before triggering a warning signal when the temperature exceeds a warning threshold above the target freezing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature warning mode is activated immediately when the appliance is switched on, then the warning signal can detect temperature rises in the freezer compartment, but it generates false alarm because the freezer compartment is initially warm and has not yet cooled down
Solution Approach 1:
The control device performs a preliminary check by comparing the ambient temperature with the warning temperature before activating the warning signal. This preliminary action prevents false alarms during the initial cooling phase when the freezer compartment temperature is still rising from ambient conditions
Solution Approach 2:
The system dynamically adjusts its warning behavior based on the operational state of the appliance. The control device determines whether the appliance is in cooling mode or normal operation mode, and only activates warnings during normal operation mode when the freezer has already been cooled to target temperature
2Loss of information
If the warning signal is generated as soon as the freezer compartment temperature exceeds the warning temperature, then the operator is informed about potential food spoilage, but the operator experiences annoyance due to premature warnings during initial warm-up phase
Solution Approach 1:
The control device performs a preliminary assessment by comparing ambient temperature with warning temperature and determining operational mode before generating warnings. This ensures that temperature monitoring information is only communicated when it represents actual operational issues rather than normal startup conditions
Solution Approach 2:
The control device acts as an intermediary that filters and contextualizes temperature data before presenting it to the user. It interprets temperature readings in the context of appliance operational state, preventing direct transmission of misleading temperature information that would cause user annoyance
3Measurement precision
If the appliance monitors temperature continuously from startup, then it can detect any temperature rise above warning temperature, but it cannot distinguish between normal startup conditions and actual malfunction
Solution Approach 1:
The control device performs preliminary measurements and assessments during startup, including comparing ambient temperature with warning temperature and determining whether the appliance has reached target cooling temperature. This preliminary information gathering provides context for subsequent temperature readings
Solution Approach 2:
The system uses feedback from multiple temperature measurements and operational state detection to continuously refine its understanding of appliance status. The control device adjusts its interpretation of temperature readings based on feedback about whether the appliance is in cooling mode or normal operation mode
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
Prevents premature warning signals by delaying the activation of the temperature warning mode until the freezer compartment has cooled sufficiently, ensuring accurate alerts only when the temperature exceeds the warning threshold, thus reducing user annoyance and false alarms.
Implementation Method 1
a refrigeration device for cooling the freezer compartment to a predetermined or predefinable target freezing temperature significantly below 0°C
Implementation Method 2
a temperature sensor for determining the actual temperature of the freezer compartment
Implementation Method 3
a thermally insulated body with an inner container that defines a freezer compartment
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a household refrigeration appliance (1) and a method for operating a household refrigeration appliance (1). The household refrigeration appliance (1) comprises a thermally insulated body (2) with an inner container (3a) that defines a freezer compartment (4a) intended for storing food, and a refrigeration device (9) for cooling the freezer compartment (4a) to a predetermined or predeterminable target freezing temperature significantly below 0°C.The method comprises the following steps: - upon switching on the household refrigeration appliance (1), controlling the refrigeration device (9) so that it cools the freezer compartment (4a) at least approximately to the target freezing temperature, - continuously or quasi-continuously determining the actual temperature of the freezer compartment (4a), in particular by means of a temperature sensor (12), - activating a temperature warning mode of the household refrigeration appliance (1) as soon as the actual temperature of the freezer compartment (4a) falls below an activation temperature less than or equal to a predetermined warning temperature and greater than the target freezing temperature, but at the latest after a predetermined switching-on time of the household refrigeration appliance (1), and - during the activated temperature warning mode, generating a warning signal as soon as the actual temperature of the freezer compartment (4a) exceeds the warning temperature, which is less than 0 °C and greater than the target freezing temperature.