Method for controlling a drying cycle of a laundry dryer
A method is provided for controlling a drying cycle of a laundry dryer having a laundry drum and an air stream fan for circulating drying air through said laundry drum. The method includes the steps of: starting a drying cycle ( 14 ); performing the drying cycle ( 16 ); detecting an electric resistance and/or conductivity of the laundry during the drying cycle ( 16 ) for estimating a dryness level of the laundry; comparing the electric resistance and/or conductivity of the laundry with an end cycle condition ( 20; 28, 30; 36 ); and finishing the drying cycle ( 16 ), if the end cycle condition ( 20; 28, 30; 36 ) is fulfilled. The end cycle condition ( 20; 28, 30; 36 ) depends on the rotation speed (S D ) of the laundry drum and/or on the rotation speed (S F ) of the air stream fan.
1. A method for controlling a drying cycle of a laundry dryer having a laundry drum and an air stream fan for circulating drying air through said laundry drum, the method comprises the steps of:
starting a drying cycle having an initial end cycle condition,
starting the drying cycle at a rotation speed (SD) of a laundry drum, and a rotation speed (SF) of the air stream fan,
estimating an amount of laundry contained in the laundry drum,
modifying the rotation speed (SD) of the laundry drum and/or the rotation speed (SF) of the air stream fan, during the drying cycle, according to an estimated amount of laundry contained in the laundry drum, a laundry dryness level, or a temperature of the air stream,
evaluating a modified rotation speed (SD) of the laundry drum and/or a modified rotation speed (SF) of the air stream fan, and, based upon such evaluation, modifying the initial end cycle condition to be a modified end cycle condition,
detecting an electric resistance and/or conductivity of the laundry during the drying cycle for estimating a dryness level of the laundry,
comparing the electric resistance and/or conductivity of the laundry with the modified end cycle condition, and
finishing the drying cycle after the modified end cycle condition is fulfilled.
2. The method according to claim 1 , wherein the drying cycle is selected by a user before the start of the drying cycle and the rotation speed (SD) of the laundry drum is adapted to the selected drying cycle.
3. The method according to claim 1 , wherein the end cycle condition depends on at least one resistance and/or conductivity threshold value (RTH).
4. The method according to claim 1 , wherein a resistance and/or conductivity threshold value (RTH) is selected before the start of the drying cycle.
5. The method according to claim 1 , wherein at least one resistance and/or conductivity threshold value (RTH) is selected in dependence of the drying cycle or the laundry dryness level.
6. The method according to claim 1 , wherein the motor driving the laundry drum and/or the motor driving the air stream fan is an inverter motor.