Patent ID: 9593442
Date: 2017-03-14
CPC Classifications: D06F

Claim:
1. A method of drying laundry by operating a laundry dryer having a treating chamber for receiving laundry for drying, the method comprising: supplying air to the treating chamber to define a supply air flow; exhausting the supply air flow from the treating chamber to define an exhaust air flow; repeatedly determining over time a temperature of the exhaust air flow to define an exhaust temperature signal; heating the supply air flow by repeatedly cycling a heater for the supply air flow between an ON state, which starts when the exhaust temperature signal satisfies a low temperature set point, and an OFF state, which starts when the exhaust temperature signal satisfies a high temperature set point; determining from the exhaust temperature signal a cool time corresponding to a time it takes the exhaust temperature to fall from the high temperature set point to the low temperature set point, and a reset time corresponding to a time the exhaust temperature is below the low temperature set point; determining a ratio between the cool time and the reset time; and initiating a termination of the drying of the laundry when the ratio indicates the laundry is dried.