Method for controlling a refrigerating appliance
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Solution Overview
Problem
Refrigerating appliances often experience unwanted switching of solenoid valves due to noise-induced anomalies, leading to unreliable execution of cooling cycles, which negatively affects both the appliance and stored food.
Innovation Solution
A method for controlling refrigerating appliances that involves detecting operating parameters from temperature sensors to determine the appropriate cooling mode for the refrigerating and freezing cells, verifying anomalies in cooling, and adjusting the switching device to ensure the desired cooling cycle is executed reliably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a solenoid valve is used to switch between refrigerating modes, then the refrigerating appliance can selectively execute different cooling cycles, but noise causes unwanted switching and reduces reliability
Solution Approach 1:
The control unit determines the suitable operating condition for the solenoid valve before executing the switching action. By pre-determining the correct mode based on detected operating parameters and comparing with current conditions, the system prepares the appropriate command in advance, ensuring accurate switching only when needed and preventing noise-induced false switching.
Solution Approach 2:
The control unit continuously monitors operating parameters (temperature, compressor status) and uses this feedback to verify whether the current operating condition matches the desired condition. This closed-loop feedback mechanism allows the system to detect anomalies and maintain reliable operation by comparing actual state with expected state, preventing unwanted switching due to noise.
2Reliability
If the control system continuously monitors operating parameters to ensure reliable cooling cycle execution, then the reliability of refrigeration control is improved, but the hardware and software resource requirements increase
Solution Approach 1:
The control unit performs monitoring and verification actions selectively rather than continuously. It determines whether verification is needed based on specific conditions (e.g., when mode switching is detected or when anomalies are suspected), performing partial monitoring only when necessary. This reduces the overall computational and hardware burden while maintaining reliability for critical operations.
Solution Approach 2:
The control unit uses already-available operating parameters (temperature readings, compressor status) that are naturally generated by the system's normal operation. By leveraging these existing data streams for verification purposes, the system performs self-monitoring without requiring additional dedicated sensors or complex external monitoring infrastructure, thus reducing hardware resource requirements.
Data Source
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AI summary
A method for controlling a refrigerating appliance, the latter comprising: a refrigerating cell (10) and a freezing cell (20); a refrigerating circuit (30) comprising: at least a first and a second evaporators (E1, E2), respectively associated with said refrigerating cell and with said freezing cell (10, 20); a switching device (EV) drivable between a first operating condition, in which it allows a cooling both of said first evaporator (E1), and of said second evaporator (E2), and a second operating condition, in which it only allows cooling of said second evaporator (E2). The method comprises: detecting a parameter representative of a command of activation of said refrigerating circuit (30); detecting one or more operating parameters representative of operating conditions of said refrigerating cell (10) and/or of said freezing cell (20) and defining an initial situation; based on said operating parameters, determining one condition, between said first and second operating conditions of said switching device (EV), which is suitable for said detected initial situation; carrying out a main verification step in order to verify an anomaly in the cooling provided by said refrigerating circuit (30) after its activation; if said anomaly is detected, sending a main signal (S) to said switching device (EV) in order to switch said switching device (EV) into said suitable condition.