Adaptive defrost control system

摘要

Control of defrost cycle initiation in a refrigeration apparatus is based on the difference between the last two defrost times, taking into account the sign of the difference so that the increase or decrease in the time between defrosts corresponds to the trend in defrost times rather than on any particular defrost time or the average of defrost times. A variety of limits are included to ensure that the time between defrosts is reactive to sudden aberrational changes in defrost times, and does not exceed minimum or maximum values.