Ice Maker Ejector Finger Control to Prevent Ice Accumulation Blockages
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Solution Overview
Problem
The ejector finger in ice makers often fails to rotate due to ice accumulation in the ice tray, causing blockages and disrupting the ice harvesting process.
Innovation Solution
A control algorithm that detects error conditions by determining if the ejector finger is stuck, enters error modes to correct the issue by rotating the ejector finger to its home position, and includes a defrost mode to melt frost and ice, ensuring reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ejector finger rotates continuously to discharge ice, then ice harvesting efficiency is improved, but ice accumulation may block the rotation mechanism
Solution Approach 1:
The control algorithm performs preliminary detection of the ejector finger's rotational status before initiating ice harvesting operations. By checking whether the ejector can rotate freely in advance, the system prevents blockages from disrupting the harvesting process, thus maintaining both productivity and reliability.
Solution Approach 2:
The control algorithm continuously monitors the ejector finger's rotational status and provides feedback to the control system. When rotation is detected or blocked, the system adjusts its operations accordingly, enabling reliable detection and removal of ice that interferes with ejector movement while maintaining continuous ice production.
2Reliability
If the ice maker heater is activated frequently to prevent ice accumulation, then ejector finger rotation is maintained, but energy consumption increases
Solution Approach 1:
The control algorithm monitors the ejector finger's rotational status and activates the ice maker heater only when rotation is detected to be blocked. This feedback-based control ensures the heater operates only when necessary to maintain reliability, minimizing unnecessary energy consumption.
Solution Approach 2:
The control algorithm changes the operational parameters of the ice maker heater based on the detected rotational status of the ejector finger. By adjusting the heater's activation and duration according to actual conditions, the system maintains reliability while optimizing energy usage.
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
The solution effectively addresses the issue of ice accumulation by ensuring the ejector finger can rotate freely, maintaining the ice maker's functionality and preventing blockages, thus ensuring continuous ice production.
Implementation Method 1
turning on the ice maker heater... and turning off the ice maker heater when an ice maker heater error correction time has elapsed or when a temperature of the ice tray is equal to or greater than a first predetermined temperature
Data Source
AI summary
In a method for controlling an ice maker, a motor rotates an ejector finger relative to an ice tray in a first direction and in a second direction opposite the first direction to discharge ice from the ice tray. When an error condition occurs, the ice maker enters a first error mode, during which an ice maker heater is turned on until the temperature of the ice tray reaches a predetermined temperature or until an ice maker heater error correction time elapses. When the ejector finger is at a home position, the motor rotates in the second direction until the ejector finger is not at the home position or for a first predetermined number of steps, whichever occurs first, and then rotates in the first direction until the ejector finger is at the home position.