Smart timer for refrigerators and similar appliances
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Solution Overview
Problem
Observant Jews face challenges in using refrigerators during Sabbath and holidays without violating Jewish law, as manual actions can inadvertently cause changes in electric current flow, which is prohibited.
Innovation Solution
A system that inserts a controller in the AC power line of refrigerators to establish a repetitive on-off cycle during Sabbath/Holiday Mode, using different color indicator lights to inform users when it is safe to open or close the door, ensuring no current flow changes occur due to user actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refrigerator compressor operates continuously to maintain food safety, then temperature control is improved, but current flow changes occur that violate Jewish law during Sabbath and holidays
Solution Approach 1:
The patent implements periodic on-off cycles for the refrigerator compressor during Sabbath and holiday modes. The controller automatically switches the compressor between on and off states at predetermined intervals, maintaining food safety through regular cooling cycles while preventing continuous current flow that would violate Jewish law. This periodic operation allows the system to achieve both religious compliance and food preservation.
Solution Approach 2:
The system uses sensors to detect when the refrigerator door is opened and automatically adjusts the on-off cycle timing based on temperature changes. When the door is opened, the controller delays the next off-cycle until the temperature stabilizes, ensuring food safety without requiring manual intervention. This self-adjusting mechanism maintains reliability while adhering to religious restrictions.
2Ease of operation
If the refrigerator door is opened frequently for user access, then ease of operation is improved, but temperature fluctuations cause current flow changes that violate Jewish law
Solution Approach 1:
The controller provides advance warning to users before the refrigerator enters an off-cycle period through visual indicators (lights or display messages). Users are notified in advance of when the compressor will turn off and when door access is permitted, allowing them to plan their access accordingly. This preliminary notification system enables ease of operation within the constraints of Jewish law by informing users of safe access windows.
Solution Approach 2:
The system continuously monitors refrigerator door status and internal temperature, providing real-time feedback to the control algorithm. When the door is detected as open, the controller adjusts the timing of subsequent on-off cycles to account for temperature fluctuations. This feedback mechanism ensures that door access needs are met while preventing temperature-induced current flow changes that would violate religious law.
3Use of energy by moving object
If the refrigerator operates in traditional on-off cycles based on temperature, then energy efficiency is improved, but manual door opening during off-cycles causes temperature rise and subsequent current flow changes
Solution Approach 1:
The patent implements dynamic adjustment of the refrigerator's on-off cycle timing based on real-time door status and temperature conditions. When the door is opened, the controller dynamically delays the next off-cycle until temperature stabilizes, rather than following a fixed schedule. This dynamic adaptation maintains energy efficiency by avoiding unnecessary extended run times while preventing temperature-induced current flow changes during Sabbath and holiday modes.
Data Source
AI summary
In order to permit use of a refrigerator by observant Jews during Holiday times, Normal and Holiday modes are established. During Holiday mode, repetitive fixed frequency and fixed duty cycle time cycles are established, each time cycle having “on” and “off” portions. During “on” cycle portions current flow through the refrigerator is permitted as determined by the refrigerator compartment temperature. During “off” cycle portions current flow is inhibited irrespective of refrigerator compartment temperature changes. Visible indicators inform users of the status of the current cycle portion, thereby advising them to open the refrigerator door only during “off” cycle portions.