US 11,655,584 B2
Dryer appliance nuisance trip detection
Joshua Reeves, Louisville, KY (US); and Ionelia Silvia Prajescu, 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 Oct. 1, 2020, as Appl. No. 17/60,553.
Prior Publication US 2022/0106731 A1, Apr. 7, 2022
Int. Cl. D06F 58/50 (2020.01); D06F 103/38 (2020.01); D06F 103/32 (2020.01)
CPC D06F 58/50 (2020.02) [D06F 2103/32 (2020.02); D06F 2103/38 (2020.02)] 10 Claims
OG exemplary drawing
 
1. A dryer appliance comprising:
a cabinet;
a drum rotatably mounted within the cabinet, the drum defining a chamber for the receipt of articles for drying;
a heating system fluidly coupled to the drum whereby heated air flows from the heating system to the chamber of the drum for drying of articles within the chamber;
a primary heat control system comprising a thermistor;
a secondary heat control system comprising a thermostat; and
a controller in operative communication with the thermistor of the primary heat control system, the controller configured to:
monitor a temperature with the thermistor of the primary heat control system;
determine a temperature gradient of the monitored temperature based on a rate of change in the monitored temperature over time;
store a current value of the monitored temperature as a peak temperature when the temperature gradient changes from positive to negative;
verify the temperature gradient is still negative after a first wait period;
verify there is a call for heating after verifying the temperature gradient is still negative after the first wait period;
allow a second wait period to elapse after verifying the call for heating;
verify the temperature gradient is still negative after the second wait period;
store a present value of the monitored temperature after verifying the temperature gradient is still negative after the second wait period;
determine that a difference between the peak value of the monitored temperature and the present value of the monitored temperature is greater than a predetermined threshold; and
detect a nuisance trip because the difference between the peak value of the monitored temperature and the present value of the monitored temperature is greater than the predetermined threshold.