ADAPTIVE DEFROST CONTROL FOR A REFRIGERATOR

摘要

A defrost control system for a refrigerator having freezer and fresh food compartments includes a plurality of temperature sensors, a plurality of door sensors to provide signals indicative of the occurrence of a door opening condition, a memory to store the signals in a plurality of usage blocks, and a CPU or controller to categorize the usage blocks into periods of high and low usage. When a defrost cycle is required, the control system establishes the cycle at an upcoming period designated as one of low usage. Additionally, prior to activating the system, the controller lowers the temperature of at least the freezer compartment to below a set point. The controller establishes the defrost cycle for a period based upon the time duration of previously completed cycles.