Patent ID: 7685849

Claim:
A control system for an appliance including a cabinet, a wash tub positioned within the cabinet and configured to receive laundry, and a fill device configured to deliver liquid into the wash tub, said control system comprising: a first detecting component configured to detect an amount of the liquid delivered into the wash tub; a second detecting component configured to detect a liquid level in the wash tub; and a controller operatively coupled with said first detecting component and said second detecting component, said controller configured to receive signals from said first detecting component and said second detecting component and calculate a volume difference based on the detected liquid amount delivered into the wash tub and the detected liquid level in the wash tub, said controller further configured to calculate a weight of the laundry (W) by the equation: W=A×L−B, where A is a density of the laundry, L is the calculated volume difference, and B is a predetermined value based on liquid absorbed by the laundry and residual liquid around the laundry in the wash tub.