Refrigerator ice maker with shut off arm position sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ice makers in refrigerators often produce false full or empty indications due to ice clumping, mounding, or melting, leading to unreliable sensing of ice volume in storage bins.
Innovation Solution
Implementing a shut off arm position sensor capable of sensing multiple positions of the shut off arm, such as through the use of encoders or potentiometers, to accurately determine the ice level in the storage bin, including intermediate positions beyond full and empty levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple position switch (microswitch or hall effect sensor) is used to detect ice storage bin fullness, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates due to false full or empty indications caused by ice clumping, mounding, or melting
Solution Approach 1:
The patent transitions from a static binary switch (full/empty) to a dynamic multi-position sensor system that continuously monitors the shut off arm position throughout its range of motion. This enables detection of intermediate positions that indicate ice clumping, mounding, or melting conditions, thereby improving reliability without requiring complex additional hardware beyond the sensor's enhanced positioning capability
Solution Approach 2:
The patent replaces traditional mechanical microswitches or simple hall effect sensors with an encoder-based positioning system. This substitution transforms the detection mechanism from a binary mechanical contact system to a precision mechanical-to-electrical conversion system that provides continuous positional data, improving reliability while maintaining mechanical simplicity in the shut off arm mechanism itself
2Measurement precision
If a shut off arm position sensor sensing only binary positions (full/empty) is used, then the device complexity is minimized, but the measurement precision deteriorates because it cannot detect intermediate positions indicating ice clumping or melting
Solution Approach 1:
The system transitions from static binary position detection to dynamic continuous position monitoring. The encoder captures the shut off arm's position throughout its entire range of motion, enabling precise measurement of intermediate positions that indicate ice clumping, mounding, or melting, thereby improving measurement precision without adding complex mechanical structures
Solution Approach 2:
The patent replaces binary mechanical switches with an encoder-based system that converts mechanical position into precise electrical signals. This substitution enables high-resolution position measurement while keeping the mechanical shut off arm mechanism simple, achieving improved measurement precision without proportional increases in mechanical complexity
3Loss of information
If traditional position switches are used to detect ice storage bin fullness, then the ease of operation is maintained with simple binary feedback, but the loss of information increases because intermediate positions indicating ice clumping, mounding, or melting cannot be detected
Solution Approach 1:
The system transitions from static binary feedback to dynamic continuous position monitoring, capturing the shut off arm's position throughout its range of motion. This enables detection of intermediate positions that provide valuable information about ice clumping, mounding, or melting conditions, reducing information loss without adding complex mechanical components
Solution Approach 2:
The patent replaces information-poor binary switches with an encoder system that converts mechanical position into rich electrical data. This substitution preserves all positional information including intermediate positions that indicate ice condition problems, reducing information loss while keeping the mechanical shut off arm mechanism simple
Data Source
AI summary
A refrigerator utilizes an ice maker including a shut off arm position sensor capable of sensing a plurality of positions of a shut off arm. Doing so may enable, for example, false full or empty indications to be detected, and in some instances, enable detection of potentially fused ice in a storage bin.