Patent ID: 9140477
Filing Date: 2015-09-22
Classification: F25B,F25D

Abstract:
1. A refrigerator appliance, comprising: a condenser, a refrigerant and a compressor; a refrigeration compartment, and a freezer compartment having corresponding refrigeration and freezer compartment set point temperatures, wherein each set point temperature has an upper threshold temperature and a lower threshold temperature; an evaporator in thermal communication with the freezer compartment; a refrigeration compartment fan and a freezer compartment fan for directing flow of cool air in thermal communication with the evaporator to the refrigeration and freezer compartments, respectively; a refrigeration compartment sensor that generates a signal indicative of a temperature in the refrigeration compartment as a function of time; a freezer compartment sensor that generates a signal indicative of a temperature in the freezer compartment as a function of time; a refrigerant circuit arranged to allow flow of the refrigerant between the condenser, the evaporator and the compressor; and a controller that receives the signals from the freezer and refrigeration compartment sensors and is coupled to the compressor, freezer and refrigeration compartment fans, wherein the controller, by operation of one or more of the compressor, the refrigeration compartment fan and the freezer compartment fan, is configured to: (a) synchronize alternating cycles of cooling the freezer and refrigeration compartments to temperatures approximately equal to their respective compartment set point temperatures, (b) begin a cycle of cooling the refrigeration compartment at substantially a same time, an interval before, or an interval after, the temperature in the freezer compartment reaches the freezer compartment lower threshold temperature, and (c) begin a cycle of cooling the freezer compartment at substantially a same time, an interval before, or an interval after, the temperature in the freezer compartment reaches the freezer compartment upper threshold temperature, wherein the controller is further adapted to drive a rate of cooling in the freezer compartment such that the temperature in the freezer compartment during the cycle of cooling the freezer compartment reaches the freezer compartment lower threshold temperature at substantially a same time that the temperature in the refrigeration compartment reaches the refrigeration compartment upper threshold temperature by operation of one or more of the compressor, the refrigeration compartment fan and the freezer compartment fan.