Patent ID: 8726680

Claim:
A refrigerator comprising: a first compartment; a second compartment; a refrigeration system including a variable speed compressor for cooling the first and second compartments; and, an electronic control system for controlling a speed of the variable speed compressor; wherein: the electronic control system controls the speed of the variable speed compressor according to a calculated speed using a first polynomial equation that includes a first compartment set-point temperature, a second compartment set-point temperature and an ambient temperature, when a first compartment temperature is within a first predetermined level and a second predetermined level greater than the first predetermined level, and controls the speed of the variable speed compressor using a second polynomial equation that includes the first polynomial equation and additional parameters when the first compartment temperature is greater than the second predetermined level, and controls the speed of the variable speed compressor using a third polynomial equation that includes the first polynomial equation and other additional parameters when the first compartment temperature is less than the first predetermined level.