Refrigerator Door Alarm for Failed Closure Detection

The system dynamically adjusts the alarm trigger condition based on door movement behavior. Instead of using a fixed time delay, it monitors whether the door is actually closing by detecting changes in door angle or position. If the door fails to close properly (detected by angle sensors or distance sensors), the alarm triggers immediately. This dynamic adaptation allows the system to distinguish between intentional brief openings and failed closures, resolving the contradiction between avoiding false alarms and ensuring timely detection.

The system uses feedback from sensors (angle sensors, distance sensors, or position sensors) to continuously monitor door status and determine whether the door is actually closing. The alarm trigger condition is based on feedback indicating that the door failed to close properly, rather than simply being opened. This feedback mechanism allows the system to wait for the appropriate moment to trigger the alarm, avoiding false alarms during normal operations while still providing timely notification when something is wrong.

The patent replaces the traditional mechanical/time-based alarm trigger mechanism with sensor-based detection systems. Angle sensors, distance sensors, or position sensors are used to detect the actual physical state of the door (whether it is closing or obstructed). This substitution of mechanical timing with optical or positional sensing improves detection accuracy while maintaining reasonable system simplicity, as the sensors provide direct information about door status without requiring complex timing logic.