[0001] The present invention relates to the field of household tumble dryers of the vented
type or the condensing type. More particularly, the present invention concerns a drying
cycle control procedure for a household tumble dryer.
[0002] Household tumble dryers are quite popular nowadays.
[0003] As widely known, these appliances generally comprise a rotatable drum, which defines
an interior drying volume for receiving a wash load to be dried.
[0004] The rotatable drum is actuated by an electric motor, so as to tumble the wash load
during the drying operation of the dryer.
[0005] In dryers of the vented type, during the drying cycle, an airflow is taken from outside
the appliance. The airflow is heated by a heating element and it is forced to pass
through the drying volume, so as to remove humidity from the wash load. The humid
exhaust air is then blown outside the appliance.
[0006] In dryers of the condensing type, the airflow follows a closed path that is fully
inside the appliance. After being heated, the airflow passes through the drying volume.
The humid exhaust air is then circulated to a condenser for dehumidification and it
is again conveyed to the heating element for being heated again.
[0007] In both the cases above, the circulation of the mentioned airflow is ensured by a
fan.
[0008] Traditional dryers generally comprise a control unit, which executes a drying cycle
control procedure for properly managing the drying cycle, i.e. the sequence of operations
needed for drying the wash load, (see for example (
EP-A-1420104).
[0009] Said control procedure may comprise some non-critical steps, such those of sending
appropriate command signals to the heating element and the actuating elements of the
dryer.
[0010] Instead, a notoriously critical aspect is represented by the control strategy that
is chosen for terminating the drying cycle, in other words, by the information and
the criteria that are used to decide the termination of the drying cycle.
[0011] As it will be more apparent in the following discussion of the state of the art,
these factors may have remarkable influence on the overall performances of dryer,
particularly on the wash load drying quality.
[0012] In some dryers of the prior art, the control unit merely terminates the operating
drying cycle as soon as a predetermined and selectable drying interval elapses.
[0013] These dryers generally provide poor performances, since their drying cycle control
procedure does not take into account the actual quantity and quality of the wash load.
The user can merely select the predetermined drying interval that seems more appropriate
for the wash load to be dried. This often determines the occurrence of over-drying
or under-drying conditions of the wash load.
[0014] Other known dryers comprise strips of moisture or resistive sensors, which may be
placed at the drum internal surface to detect the level of humidity of the wash load.
The control unit stops the operating drying cycle as soon as the humidity level is
lower than a predefined threshold.
[0015] Also these solutions have drawbacks. The mentioned sensors can only detect the superficial
humidity of the wash load. Thus, the control unit is often provided with partial or
wrong information related to the actual moisture content of the wash load. This fact
may of course bring to unsatisfactory drying conditions of the wash load, especially
when drying bulky items. In fact in such loads, as like for instance sleeping bags
or heavy blankets, water is maintained for a longer time in the interior of the load
without being sensed by the strips sensor, while the external portion, that becomes
dried more quickly being in contact with the sensor, generates a wrong "dryness-signal"
condition. In addition the mentioned strips of sensors are relatively expensive, particularly
with respect to the cost reduction needs of an industrial mass-production for the
dryer.
[0016] Japanese patent application nr.
58-173599 discloses a condenser dryer, in which temperature sensors detect the temperature
difference between two predefined locations of the interior drying volume, specifically
the water of the condenser and the air after the heater. The control unit stops the
operating drying cycle as soon as the drying operation passes from a constant-rate
drying period, in which said temperature difference is maintained substantially constant
after an initial rise, to a falling-rate drying period, in which said temperature
difference increases again.
[0017] This kind of solution is defective in that it still does not provide a precise control
of the duration of the operating drying cycle, since the quantity and kind of the
wash load is again not considered. For example, when the wash load is light the mentioned
constant-rate drying period may not be present or it may quite short. Thus, the timing
for the termination of the operating drying cycle cannot be precisely determined in
certain operative conditions. In this cases, over-drying or under-drying conditions
of the wash load still tend to occur. This solution cannot be applied to an air vented
dryer.
[0018] US patent nr. 4,640,022 discloses a condensing dryer, in which a first sensor is placed upstream the heater
and a second sensor is placed upstream the condenser. After a predefined period of
drying, the difference between the detected temperatures is evaluated. The drying
cycle is terminated after another predefined period of time from when said difference
overcomes a threshold value A+B, where A is a predefined reference value and B is
a selected value, which may vary in accordance with the time elapsed from the starting
of the drying cycle and which takes into account certain operating variables such
as the quantity and kind of wash load to be dried.
[0019] In this solution predefined drying intervals are still adopted. Once these drying
intervals are selected, they cannot be changed anymore according to the actual drying
conditions of the wash load. This fact introduces some restrictions to the drying
cycle control procedure, which might bring to unsatisfactory drying performances.
Said control procedure is apparently influenced by the locations chosen for the sensor
means and it is therefore not suitable for vented dryers. More specifically, one temperature
sensor is located prior than the heating element dryer, In such position it would
measure the temperature of the external air drawn into the drying chamber.
[0020] Therefore, the main aim of the present invention is to provide a drying cycle control
procedure for a household tumble dryer, which allows the overcoming of the above mentioned
drawbacks.
[0021] Within this aim, it is an object of the present invention to provide an improved
drying cycle control procedure for a household tumble dryer, , particularly in terms
of control strategy for managing the termination of the drying cycle.
[0022] It is an object of the present invention to provide an improved drying cycle control
procedure for a household tumble dryer, in which said improved drying cycle control
procedure is not influenced by the dryer vented or condensing configuration and that
is particularly efficient in determining the duration of the drying cycle when drying
"bulky" loads.
[0023] It is also an object of the present invention to provide an improved drying cycle
control procedure for a household tumble dryer, which is easy to manufacture at industrial
level, at competitive costs.
[0024] Thus, the present invention provides a drying cycle control procedure for a household
tumble dryer, according to the claim 1 proposed in the following and the claims depending
therefrom.
[0025] In the household tumble dryer, according to the present invention, drying cycle control
procedure least comprises a termination control procedure for managing the termination
the drying cycle. Said termination control procedure comprises a cyclic estimation
of the actual level of moisture of the wash load, basing on the information acquired
from temperature sensor means, which are positioned at inlet and outlet portions of
the dryer rotatable drum.
[0026] The actual residual mass of water, which is actually present in the wash load, is
thus continuously monitored. This allows an easy and precise determination of the
timing for terminating the drying cycle, in order to ensure a high quality drying
level for the wash load.
[0027] Further features and advantages of the household tumble dryer, according to the present
invention, will become apparent from the following description of preferred embodiments,
taken in conjunction with the drawings, in which:
Fig. 1 represents a schematic diagram of the household tumble dryer, according to
the present invention, in a configuration of the vented type; and
Fig. 2 represents a schematic diagram of the household tumble dryer, according to
the present invention, in a configuration of the condensing type; and
Fig. 3A represents a schematic diagram of an improved drying cycle control procedure
adopted by the household tumble dryer, according to the present invention;
Fig. 3B represents a schematic diagram of a termination control procedure included
in the drying cycle control procedure of figure 3A; and
Fig. 4 represents a schematic diagram related to the behaviour over time of some relevant
quantities in the household tumble dryer, according to the present invention.
[0028] Referring now to the cited figures, the present invention related to a household
tumble dryer 1, which comprises a rotatable drum 2 that is preferable actuated by
an electric motor 3.
[0029] The rotatable drum 2 defines an interior drying volume 200 for receiving a wash load
100 for drying. The drying volume 200 comprises an air inlet portion 201, through
which an airflow 20 enters the drying volume 200, and an air outlet portion 202, through
which the airflow 20 exits from the drying volume 200 after having passed through
it.
[0030] In the embodiment of figure 1, the dryer 1 is structured as a vented dryer. The airflow
20 is thus taken directly from outside the dryer 1 and it is blown again into the
external environment, after having passed through the drying volume 200. Before entering
the drying volume 200, the airflow 20 is heated by a heating element 5.
[0031] In the embodiment of figure 2, the dryer 1 is configured as a condensing dryer. In
this case, the airflow 20 follows a closed loop, which is interior the dryer 1. After
having been heated by the heating element 5, the airflow enters the drying volume
200 through the air inlet portion 201. After having passed through the drying volume
200, the airflow exits from the air outlet portion 202 and is directed towards a condenser
4 for dehumidification. Then, the airflow 20 is directed again to the heating element
5 for being re-heated.
[0032] In both the illustrated embodiments, the correct circulation of the airflow 20 is
ensured by properly positioned air ducts (not shown) and by a fan 8.
[0033] The dryer 1 comprises sensor means 6A-6B for detecting the temperature of the airflow
20 at the air inlet portion 201 and at the air outlet portion 202. Preferably, said
sensor means comprise a first temperature sensor 6A, which is positioned at the air
inlet portion 201, and a second temperature sensor 6B that is located at the air outlet
portion 202. The temperature sensors 6A-6B may advantageously comprise properly arranged
thermocouples. Of course, temperature sensors of different kind may be used.
[0034] A control unit 70 is also provided in the dryer 1. The control unit 70 controls the
operating drying cycle of the dryer 1 by sending proper command signals 71 to the
heating element 5, the motor 3 and the fan 8. The control unit 70 receives from the
sensor means 6A-6B signals 61 that are indicative of the temperature of the airflow
20 respectively at the air inlet and outlet portions 201, 202.
[0035] The control unit 70 manages the drying cycle of the dryer 1 by means of a drying
cycle control procedure 500. As mentioned above, the term "drying cycle" intends the
sequence of steps, which is needed for performing drying operations of the wash load
100.
[0036] The control procedure 500 may include some traditional steps (globally indicated
by the reference 501), which may comprise the steps of enabling/disabling the user's
access to the drying volume 100, the steps of sending command signals 71 to the electric
motor 3, to the fan 8 and/or to the heating element 5, and so on.
[0037] The control procedure 500 includes a termination control procedure 502, which is
aimed ad managing the termination of the drying cycle.
[0038] The termination control procedure 502, as well as the other mentioned traditional
steps 501 of the control procedure 500, may be executed by processing means 7 of the
control unit 70.
[0039] The termination control procedure 502 comprises an evaluation procedure 50 for estimating
the actual level of moisture of the wash load 100, basing on the information provided
by the sensor means 6A-6B.
[0040] Preferably, the evaluation procedure 50 is cyclically executed as soon as the drying
cycle starts running. Anyway, a time delay may be introduced according to the needs.
Referring now to the figure 3B, the evaluation procedure 50 comprises a first step
i) and a second step ii) of acquiring an inlet air temperature value T
IN and an outlet air temperature value T
OUT, which are indicative of the temperature of the airflow 20 respectively at the air
inlet portion 201 and at the air outlet portion 202. The values T
IN and T
OUT may be advantageously obtained by properly filtering the signals 61 provided by the
sensor means 6A-6B, so as to improve the signal to noise ratio.
[0041] When the evaluation procedure 50 starts running, it may adopt a reference value A
0, which may have been already stored by the control unit 70, or that can be calculated
in a preliminary step (10), over a predefined initial period of time Δ
T according to the following relation (a):

[0042] The evaluation procedure 50 then comprises a third step iii) of calculating a first
value A
i, which is indicative of the mean difference between temperature value T
IN and the temperature value T
OUT over a predefined period of time Δ
T
[0043] The following values A
i may be advantageously calculated by means of the following relation (b):

where t
I is the evaluation time and Δ
T is the temperature sampling time, which may be of 10s, for example.
[0044] Then, it is provided the subsequent step iv) of comparing the first value (Ai) with
the reference value A
0.
[0045] At any cycle of the evaluation procedure 50, the reference value A
0 is automatically updated. The reference value A
0 basically represents a reference difference between the temperatures of the airflow
at the inlet and outlet portions 201 and 202.
[0046] The evaluation procedure 50 comprises a further step v) of calculating a second value
A
max, which is the maximum between the calculated first value A
i and the reference value A
0. A
max can be calculated according to the following relation (b):

[0047] Once A
max is calculated, the evaluation procedure 50 foresees the step vi) of calculating a
third value (D
i), which is obtained from the ratio between the first value A; and the second value
A
max, according to the following relation (c):

[0048] The third value D
i well represents the moisture content in the wash load. D
i is calculated from the difference between the temperature T
IN of the heated airflow 20A, which has just been heated to enter the drying volume
200, and the temperature T
OUT of the wet airflow 20B, which exits from the drying volume 200, said temperature
T
OUT being mainly correlated to the actual temperature of the wash load 100.
[0049] The temperature difference T
IN-T
OUT is mainly correlated to the actual level of humidity of the wash load 100, as clearly
shown by the following relation (d):

where M
R(t) is the moisture retention value and T
e is the temperature of the environment external to the dryer 1.
[0050] M
R(t) is correlated to the ratio between the actual mass of water in the wash load 100
and the mass of the wash load in dry conditions, as shown in the following relation
(e):

where W(t) is the instantaneous weight of the wet wash load 100 (i.e. not having been
dried yet) and Wo is the weight of the wash load 100 in dry conditions.
[0051] It is apparent how the above relation (d) is basically determined by two factors
that are the actual evaporation rate dM
R(t)/dt and possible heat losses of the dryer 1. Since D
i is expressed as a normalized ratio, a robust compensation against possible airflow
and heat loss variations is provided for this control quantity.
[0052] On the other hand, the strict relation existing between D
i and the moisture retention level M
R can also be appreciated from figure 4, in which the temperatures T
IN and T
OUT and the quantities M
R and D; over time are shown.
[0053] The results of the evaluation procedure 50 are used by the control unit 70 in the
termination control procedure 502 to decide whether terminate or not the drying cycle.
[0054] According to the step vii) of the termination control procedure 502, the control
unit 70 terminates the drying cycle if the third value D
i is lower than a predefined threshold value D
T, which is indicative of a desired moisture retention threshold M
RD. Preferably, a value of 60% if chosen for D
T. As it can be observed from figure 4, this value corresponds to a M
RD of about 3%.
[0055] If the drying cycle is terminated, the control unit 70 sends command signals 71 for
switching off the heating element 5 and the electric motor 3. The user can preferably
access the drying volume 200 to remove the wash load 100, after a predefined time
interval, so as to allow the wash load 100 to cool down.
[0056] If the third value D
i is higher than the threshold D
T, it means that a certain level of humidity is still present in the wash load 100.
Thus, the alternative step viii) of the termination control procedure 502 foresees
for the drying cycle to be continued. In this case, the processing means 7 repeat
the evaluation procedure 50 by considering the calculated second value A
max as new reference value A
0.
[0057] The household tumble dryer 1, according to the present invention, has proven to fulfil
the intended aims and objects.
[0058] The drying cycle control procedure 500 adopts a simple and effective control strategy
for terminating the drying cycle, since the evaluation procedure 50 provides all the
needed information for precisely determining the termination timing for the drying
cycle, depending on the actual drying conditions of the wash load. That means that
the possibilities of incurring in wash load over-drying or under-drying conditions
are dramatically reduced.
[0059] The termination control procedure 502 is quite simple to carry out and it is provided
also with a certain level of flexibility, since the termination of the drying cycle
can be delayed or anticipated depending on the desired drying conditions of the wash
load. To this aim, different threshold values D
T can be made available.
[0060] Additionally, it has been shown how the drying cycle control procedure 500 works
with the dryer 1 in vented or condensing configuration, without the need of additional
hardware/software resources.
[0061] The dryer 1 has a simple structure, which has been proven to be easy to manufacture
at industrial level, at competitive costs, since standard hardware components may
be used, particularly for what concerning the temperature sensors. On the other hand,
the termination control procedure 502, the evaluation procedure 50 and, more in general,
the whole drying cycle control procedure 500 may be easily carried out by properly
arranged computer programs. To this aim, the processing means 70 may comprises one
or more microprocessor units.
1. A drying cycle control procedure (500) for managing the drying cycle of a household
tumble dryer (1), said household tumble dryer comprising at least a rotatable drum
(2), which defines an interior drying volume (200) for receiving a wash load (100)
for drying, said interior drying volume comprising an air inlet portion (201), through
which an airflow (20, 20A) enters said internal drying volume, and an air outlet portion
(202), through which said airflow (20, 20B) exits from said internal drying volume
after having passed through said internal drying volume, said household tumble dryer
further comprising a heating element (5) for heating said airflow before said airflow
reaches said air inlet portion, and sensor means (6A, 6B) for detecting the temperature
of said airflow at said air inlet portion and at said air outlet portion, said drying
cycle control procedure comprising a termination control procedure (502) for managing
the termination of said drying cycle,
characterised in that said termination control procedure comprises the following steps:
i) acquiring an inlet air temperature value (TIN), which is indicative of the temperature of said airflow at said air inlet portion;
and
ii) acquiring an outlet air temperature value (TOUT), which is indicative of the temperature of said exhaust air at said air outlet portion;
and
iii) calculating a first value (Ai), which is indicative of the mean difference between said inlet air temperature value
(TIN) and said outlet air temperature value (TOUT) over a predefined period of time (ΔT); and
iv) comparing said first value (Ai) with an reference value (A0), which is indicative of the mean difference between said inlet air temperature value
(TIN) and said outlet air temperature value (TOUT); and
v) calculating a second value (Amax), which is the maximum between said first value (Ai) and said reference value (A0); and
vi) calculating a third value (Di) from the ratio between first value (Ai) and said
second value (Amax), said third value being indicative of the moisture retention value (MR) of said wash load; and
vii) if said third value (Di) is lower than a predefined threshold value (DT), terminating said drying cycle.
viii) if said third value (Di) is higher than a predefined threshold value (DT), repeating at least said steps i)-vi) by considering said second value (Amax) as new reference value (A0).
2. A drying cycle control procedure, according to claim 1, characterised in that said predefined threshold value (DT) is 60%.
3. A drying cycle control procedure, according to one of the claims from 1 to 2, characterised in that said predefined threshold value (DT) is indicative of a desired moisture retention value (MRD)
4. A drying cycle control procedure according to claim 3, characterised in that said desired moisture retention value (MRD) is 3%.
5. A drying cycle control procedure according to one of the previous claims, characterised in that the household tumble dryer it is of the vented type.
6. A drying cycle control procedure according to one of the claims from 1 to 4, characterised in that it the household tumble dryer is of the condensing type.
1. Trockenzyklussteuerungsverfahren (500) zum Handhaben des Trockenzyklus eines Haushaltswäschetrockners
(1), wobei der Haushaltswäschetrockner mindestens eine drehbare Trommel (2) umfasst,
die ein inneres Trockenvolumen (200) zum Aufnehmen einer Wäscheladung (100) zum Trocknen
definiert, wobei das innere Trockenvolumen einen Lufteinlassabschnitt (201), durch
den ein Luftstrom (20, 20A) in das innere Trockenvolumen eintritt, und einen Luftauslassabschnitt
(202), durch den der Luftstrom (20, 20B) das innere Trockenvolumen verlässt, nachdem
er durch das innere Trockenvolumen gegangen ist, umfasst, wobei der Haushaltswäschetrockner
ferner ein Heizelement (5), um den Luftstrom zu erhitzen, bevor der Luftstrom den
Lufteinlassabschnitt erreicht, und Sensormittel (6A, 6B) zum Erkennen der Temperatur
des Luftstroms an dem Lufteinlassabschnitt und an dem Luftauslassabschnitt umfasst,
wobei das Trockenzyklussteuerverfahren ein Beendigungssteuerungsverfahren (502) umfasst,
um die Beendigung des Trockenzyklus zu handhaben,
dadurch gekennzeichnet, dass das Beendigungssteuerungsverfahren die folgenden Schritte umfasst:
i) Erfassen eines Einlasslufttemperaturwertes (TIN), der die Temperatur des Luftstroms an dem Lufteinlassabschnitt angibt; und
ii) Erfassen eines Auslasslufttemperaturwertes (TOUT), der die Temperatur der Abluft an dem Luftauslassabschnitt angibt; und
iii) Berechnen eines ersten Wertes (Ai), der den mittleren Unterschied zwischen dem Einlasslufttemperaturwert (TIN) und dem Auslasslufttemperaturwert (TOUT) über einen vordefinierten Zeitraum (ΔT) angibt; und
iv) Vergleichen des ersten Wertes (Ai) mit einem Referenzwert (A0), der den mittleren Unterschied zwischen dem Einlasslufttemperaturwert (TIN) und dem Auslasslufttemperaturwert (TOUT) angibt; und
v) Berechnen eines zweiten Wertes (Amax), der das Maximum zwischen dem ersten Wert (Ai) und dem Referenzwert (A0) ist; und
vi) Berechnen eines dritten Wertes (Di) aus dem Verhältnis zwischen dem ersten Wert (Ai) und dem zweiten Wert (Amax), wobei der dritte Wert den Feuchtigkeitsrückhaltewert (MR) der Waschladung angibt; und
vii) falls der dritte Wert (Di) geringer ist als ein vordefinierter Schwellenwert (DT), Beenden des Trockenzyklus,
viii) falls der dritte Wert (Di) größer ist als ein vordefinierter Schwellenwert (DT), Wiederholen mindestens der Schritte i) bis vi) unter Berücksichtigung des zweiten
Wertes (Amax) als neuen Referenzwert (A0).
2. Trockenzyklussteuerungsverfahren nach Anspruch 1, dadurch gekennzeichnet, dass der vordefinierte Schwellenwert (DT) gleich 60 % ist.
3. Trockenzyklussteuerungsverfahren nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass der vordefinierte Schwellenwert (DT) einen gewünschten Feuchtigkeitsbeibehaltungswert (MRD) angibt.
4. Trockenzyklussteuerungsverfahren nach Anspruch 3, dadurch gekennzeichnet, dass der gewünschte Feuchtigkeitsbeibehaltungswert (MRD) gleich 3 % ist.
5. Trockenzyklussteuerungsverfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Haushaltswäschetrockner belüfteter Art ist.
6. Trockenzyklussteuerungsverfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Haushaltswäschetrockner kondensierender Art ist.
1. Procédure de commande de cycle de séchage (500) pour gérer le cycle de séchage d'un
sèche-linge domestique (1), ledit sèche-linge domestique comprenant au moins un tambour
rotatif (2), qui définit un volume de séchage intérieur (200) pour recevoir une charge
de lavage (100) pour le séchage, ledit volume de séchage intérieur comprenant une
partie d'entrée d'air (201), à travers laquelle un écoulement d'air (20, 20A) entre
dans ledit volume de séchage interne, et une partie de sortie d'air (202), à travers
laquelle ledit écoulement d'air (20, 20B) sort dudit volume de séchage interne après
être passé à travers ledit volume de séchage interne, ledit sèche-linge domestique
comprenant en outre un élément de chauffage (5) pour chauffer ledit écoulement d'air
avant que ledit écoulement d'air atteigne ladite partie d'entrée d'air, et des moyens
capteurs (6A, 6B) pour détecter la température dudit écoulement d'air au niveau de
ladite partie d'entrée d'air et au niveau de ladite partie de sortie d'air, ladite
procédure de commande de cycle de séchage comprenant une procédure de commande de
terminaison (502) pour gérer la terminaison dudit cycle de séchage,
caractérisée en ce que ladite procédure de commande de terminaison comprend les étapes suivantes :
i) l'acquisition d'une valeur de température d'air d'entrée (TIN), qui est indicative de la température dudit écoulement d'air au niveau de ladite
partie d'entrée d'air ; et
ii) l'acquisition d'une valeur de température d'air de sortie (TOUT), qui est indicative de la température dudit air de sortie au niveau de ladite partie
de sortie d'air ; et
iii) le calcul d'une première valeur (Ai), qui est indicative de la différence moyenne entre ladite valeur de température
d'air d'entrée (TIN) et ladite valeur de température d'air de sortie (TOUT) pendant une période prédéfinie (ΔT) ; et
iv) la comparaison de ladite première valeur (Ai) à une valeur de référence (A0), qui est indicative de la différence moyenne entre ladite valeur de température
d'air d'entrée (TIN) et ladite valeur de température d'air de sortie (TOUT) ; et
v) le calcul d'une deuxième valeur (Amax), qui est le maximum entre ladite première valeur (Ai) et ladite valeur de référence (A0) ; et
vi) le calcul d'une troisième valeur (Di) à partir du rapport entre la première valeur (Ai) et ladite deuxième valeur (Amax), ladite troisième valeur étant indicative de la valeur de rétention d'humidité (MR) de ladite charge de lavage ; et
vii) si ladite troisième valeur (Di) est inférieure à une valeur seuil prédéfinie (DT), la terminaison dudit cycle de séchage ;
viii) si ladite troisième valeur (Di) est supérieure à une valeur seuil prédéfinie (DT), la répétition d'au moins lesdites étapes i) à vi) en considérant ladite deuxième
valeur (Amax) en tant que nouvelle valeur de référence (A0).
2. Procédure de commande de cycle de séchage selon la revendication 1, caractérisée en ce que ladite valeur seuil prédéfinie (DT) est 60 %.
3. Procédure de commande de cycle de séchage selon une des revendications 1 à 2, caractérisée en ce que ladite valeur seuil prédéfinie (DT) est indicative d'une valeur de rétention d'humidité souhaitée (MRD)
4. Procédure de commande de cycle de séchage selon la revendication 3, caractérisée en ce que ladite valeur de rétention d'humidité souhaitée (MRD) est 3 %.
5. Procédure de commande de cycle de séchage selon une des revendications précédentes,
caractérisée en ce que le sèche-linge domestique est du type ventilé.
6. Procédure de commande de cycle de séchage selon une des revendications 1 à 4, caractérisée en ce que le sèche-linge domestique est du type à condensation.