Ice Maker Capacitance Sensing for Accurate Water Level Control
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Solution Overview
Problem
Existing ice makers struggle to accurately detect the water level in the ice-making groove, leading to issues such as insufficient or excessive ice production due to variations in water pressure and external shocks.
Innovation Solution
The proposed solution involves an ice maker system that includes a control box, an ice tray with an ice-making groove, a water supply unit, and a detecting unit equipped with a capacitance sensor. The sensor detects the change in capacitance value from the start of water supply to a setting time, allowing the control unit to accurately control the water supply by determining whether the ice-making water is full.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two electrodes are installed in an ice-making groove to detect water level, then water level detection is enabled, but false detection occurs due to water swaying or bouncing caused by external shocks or water pressure variations
Solution Approach 1:
The patent replaces the mechanical electrode contact method with a capacitive sensing system. The capacitive sensor detects water level through changes in capacitance values caused by dielectric constant variations when water contacts the sensor, eliminating mechanical contact and associated false detections from water movement or external shocks.
Solution Approach 2:
The patent utilizes changes in electrical parameters (capacitance values) in response to environmental conditions. By monitoring capacitance variations caused by water contact and compensating for temperature and humidity effects, the system achieves reliable water level detection without being affected by water pressure variations or external shocks that plague mechanical electrode systems.
2Ease of operation
If water supply control is based on set time duration, then control simplicity is maintained, but accurate water amount control is lost leading to overflow or insufficient ice production
Solution Approach 1:
The patent implements a feedback control system where the capacitive sensor continuously monitors water level in the ice-making groove and provides real-time information to the control unit. The control unit adjusts water supply duration and amount based on actual water level feedback, ensuring precise water control while maintaining operational simplicity through automated adjustment.
Solution Approach 2:
The patent replaces mechanical water level indicators or complex flow meters with a capacitive sensing system that electronically measures water level. This substitution enables precise water amount control through electrical parameter measurement while keeping the control interface simple and automated.
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 enables precise detection of the water level in the ice-making groove, ensuring accurate ice production by preventing overflows and ensuring the right amount of ice is formed.
Implementation Method 1
a capacitance sensor configured to detect a water level of the ice-making water supplied into the ice-making groove
Data Source
AI summary
Provided are an ice maker, a refrigerator, and a method for controlling the same, which can accurately detect whether ice-making water in accommodated in an ice-making groove is full.To this end, an ice maker according to the present disclosure includes: a control box having a control unit disposed therein, an ice tray disposed on one side surface of the control box, and formed with an ice-making groove in which ice-making water is accommodated, a water supply unit configured to supply the ice-making water to the ice-making groove, and a detecting unit configured to detect the water level of the ice-making water accommodated in the ice-making groove, in which the detecting unit includes: a sensor housing formed of a non-conductor spaced apart from the ice tray and installed on one side surface of the control box, and having a water level measuring hole into which the ice-making water in the ice-making groove flows formed in one side surface thereof, a sensor formed of a conductor being in contact with the ice-making water flowing into the sensor housing through the water level measuring hole to detect the water level of the ice-making water, and a connector wire having one end connected to the sensor, and the other end connected to the control unit.