US 12,419,483 B2
Appliance and method for operation using fluid level detection by pattern recognition of motor current
Victoria Steele, Louisville, KY (US)
Assigned to Haier US Appliance Solutions, Inc., Wilmington, DE (US)
Filed by Haier US Appliance Solutions, Inc., Wilmington, DE (US)
Filed on May 13, 2022, as Appl. No. 17/743,816.
Prior Publication US 2023/0363615 A1, Nov. 16, 2023
Int. Cl. A47L 15/00 (2006.01); A47L 15/42 (2006.01)
CPC A47L 15/0023 (2013.01) [A47L 15/0049 (2013.01); A47L 15/4225 (2013.01); A47L 2401/08 (2013.01); A47L 2401/09 (2013.01); A47L 2501/05 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A computer-implemented method for operating an appliance, the appliance including a pump configured to flow a volume of fluid, a flow nozzle configured to eject the fluid provided from the pump, and a motor configured to selectively operate the pump to flow the fluid through the flow nozzle, the method comprising:
acquiring a dataset comprising a function of current magnitude and time corresponding to operation of a pump to flow a volume of fluid;
determining an average current magnitude based at least on the dataset;
determining a standard deviation based at least on the average current magnitude; and
comparing the standard deviation to a threshold to determine whether to transmit a control command; and
transmitting the control command when the standard deviation exceeds the threshold, wherein the control command is a stop fluid fill signal corresponding to ending fluid input to the wash chamber, a start fluid fill signal corresponding to providing fluid to the wash chamber, or a pump speed change signal corresponding to adjusting operation of the pump.