BACKGROUND
1. Field
[0001] The present invention relates to a washing machine and a sensing method of the weight
of laundry contained therein, and, more particularly, to a washing machine and a sensing
method of the weight of laundry contained therein, which re-perform a laundry weight
sensing process upon occurrence of an abnormal power voltage.
2. Description of the Related Art
[0002] Generally, a washing machine includes a rotating tub connected to a motor to contain
washing laundry and washes or dehydrates the laundry by rotation by driving the motor.
[0003] A washing process and a dehydrating process include a laundry weight sensing process.
To sense the weight of laundry, a method to measure the magnitude of the load of the
motor and calculate the laundry weight therefrom has been disclosed and such a method
has been widely applied to the washing machine.
[0004] The method to sense a laundry weight using the load of the motor can ensure reliable
weight sensing when force generated from the motor satisfies an effectively controlled
state.
[0005] If an alternating current (AC) power voltage is stably supplied to the washing machine,
the motor is accurately controlled. However, if the AC power voltage is unstable,
a voltage applied to the motor differs from a voltage of a control command, which
influences the motor load to be measured. Accordingly, the weight of washing laundry
is inaccurately sensed, and the washing process and the dewatering process may not
be properly implemented.
[0006] WO 2008/003 710 discloses a washer or dryer, wherein before the washing process starts, the weight
of the laundry placed in the washer or dryer is ascertained to be as close to actual
values as possible. A speed controller compares a predetermined reference speed with
the actual speed of the motor. The speed of the motor is kept at a determined level,
and a control card regulates the motor voltage feed by monitoring the change of the
voltage coefficient with respect to time, which is determined with the output signals
of the speed controller. The control card has voltage coefficient values corresponding
to each pair of load/water amounts in its memory. The voltage coefficient is observed
by initially taking in a volume of water less than the amount necessary for washing.
The voltage coefficient then continuously observes each increment while taking in
water in incrementally increasing amounts. The load amount it is then decided by comparing
the measured voltage coefficient with the value in memory.
SUMMARY
[0007] It is an object of the invention to provide a washing machine and a sensing method
of the weight of laundry contained therein, which can accurately sense the weight
of laundry by re-sensing the weight of laundry if an AC power voltage supplied to
the washing machine is unstable.
[0008] Additional aspects and/or advantages of the invention will be set forth in part in
the description which follows and, in part, will be obvious from the description,
or may be learned by practice of the invention.
[0009] The object is solved by the features of the independent claims. Advantageous embodiments
are disclosed by the sub claims.
[0010] The judging of whether the power voltage is abnormal may count a detection time of
a zero voltage using a timer and judge abnormality according to a difference between
a detection time of a previous zero voltage and a detection time of a current zero
voltage.
[0011] The judging of whether the power voltage is abnormal may include determining whether
the difference is greater than a preset maximum value or less than a preset minimum
value, and if the difference is greater than the maximum value or less than the minimum
value, judging that the power voltage is abnormal.
[0012] If an abnormal power voltage is generated, the re-performing of the sensing of the
weight of laundry may be executed after a prescribed standby time.
[0013] If the laundry weight sensing process is divided into a plurality of intervals, the
judging of whether the power voltage is abnormal may be executed whenever each interval
is performed, and if an abnormal power voltage is generated, re-performing a corresponding
interval.
[0014] The method may include detecting a zero voltage of an alternating current (AC) power
and determining whether a power voltage is abnormal by comparing a difference between
a detection time of a current zero voltage and a detection time of a previous zero
voltage with a reference value.
[0015] The re-performing of the sensing of the weight of laundry may be executed, after
waiting a set time from when the abnormal power voltage is generated and the set time
has elapsed.
[0016] The power monitor may be a zero-voltage detector to detect a zero voltage of an AC
power.
[0017] The controller may include a timer to count a detection time of a zero voltage of
the zero-voltage detector and determine whether the power is abnormal according to
a difference between a detection time of a previous zero voltage and a detection time
of a current zero voltage, using the timer.
[0018] The controller may judge that the power is abnormal if the difference is greater
than a maximum value or less than a minimum value.
[0019] The washing machine may include an AC power to drive the motor, a zero-voltage detector
to detect a zero voltage of the AC power and generate a zero-voltage signal, and a
microprocessor to determine whether the AC power is abnormal according to an input
time of the zero-voltage signal and sense the weight of the laundry when the AC power
is abnormal.
[0020] The microprocessor may include a timer to perform a count operation according to
the zero-voltage signal, and judge that the AC power is abnormal due to abrupt power
failure if a count value of the timer is greater than a first reference value.
[0021] The microprocessor may include a timer to perform a count operation according to
the zero-voltage signal, and judge that the AC power is abnormal due to noise contained
in the power if a count value of the timer is less than a second reference value.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] These and/or other aspects and advantages of the invention will become apparent and
more readily appreciated from the following description of the embodiments, taken
in conjunction with the accompanying drawings of which:
FIG. 1 is a cross-sectional view illustrating the configuration of a washing machine
according to an exemplary embodiment of the present invention;
FIG. 2 is a block diagram of a washing machine according to an exemplary embodiment
of the present invention;
FIG. 3a is a view explaining a laundry weight sensing process according to an exemplary
embodiment of the present invention;
FIG. 3b is a view illustrating a count value when a zero-voltage signal is input according
to an exemplary embodiment of the present invention;
FIG. 4 is a view illustrating a stable AC power voltage;
FIG. 5 is a view illustrating a voltage variation due to noise included in an AC power
voltage;
FIG. 6 is a view illustrating an example of the case where a voltage does not appear
temporally at an AC power voltage due to abrupt power failure;
FIG. 7 is a flow chart illustrating a method to sense the weight of laundry according
to an exemplary embodiment of the present invention;
FIG. 8 is a flow chart illustrating in detail a process to judge whether an AC power
voltage is abnormal;
FIG. 9 is a flow chart illustrating a sensing method of the weight of laundry according
to another exemplary embodiment of the present invention; and
FIG. 10 is a flow chart illustrating a sensing method of the weight of laundry according
to a further exemplary embodiment of the present invention.
DETAILED DESCRIPTION
[0023] Reference will now be made in detail to the embodiments of the present invention,
examples of which are illustrated in the accompanying drawings, wherein like reference
numerals refer to like elements throughout. The embodiments are described below to
explain the present invention by referring to the figures.
[0024] FIG. 1 is a cross-sectional view illustrating the configuration of a washing machine
according to an exemplary embodiment of the present invention, FIG. 2 is a block diagram
of a washing machine according to an exemplary embodiment of the present invention,
FIG. 3a is a view explaining a laundry weight sensing process according to an exemplary
embodiment of the present invention, and FIG. 3b is a view illustrating a count value
when a zero-voltage signal is input according to an exemplary embodiment of the present
invention.
[0025] Referring to FIG. 1, a washing machine 10 of the present invention includes a rotating
tub 12 installed within a water tub 11 and a motor 13 to drive the rotating tub 12.
In this embodiment, a universal motor comprised of a field coil and an armature is
described as an illustrative example of the motor 13.
[0026] A belt 14 is connected between a rotating axis of the motor 13 and a pulley 15 coupled
to one side of the rotating tub 12. The belt 14 transfers the rotating force of the
motor 13 and rotates the rotating tub 12 using the rotating force.
[0027] As illustrated in FIG. 2, an AC power 20 supplied to the washing machine is converted
into a direct current (DC) power in a rectifier 21 and the converted DC power is supplied
to the motor 13. A microprocessor 30 receives a driving power through another rectifier
24 and a switched mode power supply (SMPS) 25, in addition to the AC power. Reference
numeral 26 denotes a capacitor.
[0028] A power switch 22 connected to the AC power 20 is turned on or off by the microprocessor
30. Although in this embodiment the power switch 22 is described as being configured
by a triac, the present invention is not limited thereto and a switch which can switch
an input power under control of the microprocessor 30 may be used.
[0029] The microprocessor 30 increases or decreases a duty of a gate signal applied to the
triac 22 to control a voltage applied to the motor 13.
[0030] A speed sensor 23 measures a motor speed and provides the microprocessor 30 with
a pulse corresponding to the motor speed. The microprocessor 30 recognizes the motor
speed using the provided pulse.
[0031] The speed sensor 23 may be comprised of a tachogenerator but any speed sensor which
can measure a motor speed may be employed.
[0032] The microprocessor 30 senses the weight of laundry according to a previously stored
program and varies the motor speed according to a laundry weight sensing process as
illustrated in FIG. 3a.
[0033] In this embodiment, a method to perform two laundry weight sensing processes WT1
and WT2 is applied. However, it will be understood to those skilled in the art that
the number of the laundry weight sensing processes is not limited thereto and may
be changed.
[0034] Each laundry weight sensing process is divided into multiple steps. A first interval
t1 or t11 is an accelerating interval to increase the motor speed to a set speed S;
a second interval t2 or t12 is a standby interval for stabilization of the motor speed;
a third interval t3 or t13 is an average duty calculation interval to calculate an
average duty while the motor rotates the set number of rotations; a fourth interval
t4 or t14 is an accelerating interval to increase the motor speed with a duty which
is more increased by a prescribed ratio than the average duty; and a fifth interval
t5 or t15 is a motor rotation time measurement interval to measure a single rotation
time of the motor during the accelerating interval. The motor speed, the number of
rotations, and the duty applied to each interval are not limited to specific numbers
and they may vary in consideration of characteristics of the motor applied to the
washing machine.
[0035] The washing machine according to this embodiment includes a power monitor 40 to monitor
the state of the AC power 20. The power monitor 40 serves to monitor whether an AC
power is provided without a variation of a voltage. The power monitor 40 is comprised
of a zero-voltage detector to generate a zero-voltage signal when the AC power of
a prescribed frequency is a zero voltage. However, an electric circuit which can confirm
the variation state of a power voltage may be applied to the power monitor 40.
[0036] The microprocessor 30 includes a divider 31 to divide an input clock and a timer
32 to perform a counting operation using the divided clock.
[0037] The microprocessor 30 receives the zero-voltage signal and measures a detection time
of the zero-voltage signal using the timer 32. For example, as illustrated in FIG.
3b, the timer 32 increases a count value according to the input of the zero-voltage
signal. When the zero-voltage signal is input again, the counter 32 30 resets the
count value and then increases the count value. The timer 32 repeats a process to
the count value and reset the count value whenever the zero-voltage signal is input.
[0038] If the AC power is stably provided, an input power voltage V
i regularly generates a zero voltage in correspondence to a power frequency, as illustrated
in FIG. 4.
[0039] As an example of an unstable AC power, if a power voltage including noise, as illustrated
in FIG. 5, is input, a zero-voltage signal generated each time an input power is a
zero voltage includes a signal, for example, 'C' appearing due to the noise, as well
as a normal signal.
[0040] As illustrated in FIG. 3b, the count value counted by the timer 32 according to a
normal zero-voltage signal may be reset by an abnormally generated zero-voltage signal
and then may start count again. Thereafter, the count value is reset when a normal
zero-voltage signal is input again. In this case, since a count value 'A' of the counter
32, which is generated by an abnormally generated zero signal due to noise, is less
than a reference value ZC, the microprocessor 30 can recognize the unstable state
of the AC power based on such a count value of the timer 32.
[0041] As another example of the unstable AC power, the AC power may be unstable due to
abrupt power failure as illustrated in FIG. 6. Namely, an interval B during which
a voltage does not appear temporally may occur in the middle of the AC power. Since
a zero-voltage signal does not appear during the interval of abrupt power failure,
the count value of the timer 32 is greater than the reference value ZC. Therefore,
the microprocessor 30 can recognize the unstable state of the AC power based on such
a count value of the timer 32. In this case, even if the abrupt power failure occurs,
since the microprocessor 30 receives a power charged to the capacitor 26, the microprocessor
30 can execute a control operation.
[0042] If the microprocessor 30 judges that the voltage state of the AC power is unstable
while sensing the weight of laundry, the microprocessor 30 stops the laundry weight
sensing process and re-performs the laundry weight sensing process from the beginning.
Various embodiments to re-perform the laundry weight sensing process when a voltage
variation is unstable will be described hereinbelow.
[0043] A laundry weight sensing method according to an exemplary embodiment of the present
invention is described with reference to FIGS. 7 and 8.
[0044] A washing machine applied to this exemplary embodiment senses the weight of laundry
using the laundry weight sensing process in a washing process and a dehydrating process
as described previously.
[0045] If the laundry weight sensing process is started, the microprocessor 30 monitors
a voltage state of an AC power using a zero-voltage signal received from the zero-voltage
detector 40 (step 50).
[0046] The microprocessor 30 varies a motor speed according to the laundry weight sensing
process as illustrated in FIG. 3a. First, the microprocessor 30 drives the motor 13
to increase a motor speed to the set speed S. The set speed S may be, but is not limited
to, 80 rpm in consideration of the state that laundry contained in a rotating tub
is attached to an inner surface of the washing machine.
[0047] If the motor speed reaches the set speed, the microprocessor 30 enters a standby
state to maintain the set speed for two seconds for example (step 52). Next, the microprocessor
30 calculates an average duty during 4 rotations of the motor (step 53).
[0048] The microprocessor 30 accelerates the motor speed with a duty greater than 1.5 times
the average duty (step 54). In this case, the microprocessor 30 measures a single
rotation time of the motor (step 55).
[0049] Thereafter, the microprocessor 30 judges whether an abnormal voltage is generated
while monitoring an AC power (step 56). If an abnormal voltage is generated, the microprocessor
30 proceeds to step 50 to perform the laundry weight sensing process again and repeats
the above-described operation.
[0050] Meanwhile, if no abnormal voltage is generated, the microprocessor 30 calculates
a laundry weight according to the single rotation time of the motor (step 57).
[0051] A process to judge whether an abnormal voltage is generated in step 56 is described
in detail with reference to FIG. 8.
[0052] The microprocessor 30 determines whether a zero-voltage signal is input (step 60).
If the zero-voltage signal is input, the timer 32 is rest to start count. A count
value of the timer 32 is increased until a next zero-voltage signal is input. The
microprocessor 30 confirms an input time of the zero-voltage signal (step 61) and
calculates a difference T between a count value ZC
i at an input time of a previous zero-voltage signal and a count value ZC
i-1 at an input time of a current zero-voltage signal (step 62).
[0053] The microprocessor 30 judges whether the difference T in a count value is greater
than a preset maximum value T
MAX (step 63). If the difference T is not greater than the maximum value T
MAX, the microprocessor 30 judges whether the difference T is less than a preset minimum
value T
MIN (step 64).
[0054] If the difference T is less than the preset minimum value T
MIN, the microprocessor 30 determines that an abnormal zero-voltage signal is generated
by noise included in the AC power as illustrated in FIG. 5. If the difference T is
greater than the preset maximum value T
MAX, the microprocessor determines that the zero-voltage signal is not generated by abrupt
power failure as illustrated in FIG. 6. If such abnormality case is judged (step 65),
the microprocessor 30 re-executes the laundry weight sensing process.
[0055] If the difference T is not greater than the maximum value T
MAX and not less than the minimum value T
MIN, the power voltage is judged to be normal (step 66) and the microprocessor 30 calculates
the weight of laundry according to the single rotation time of the motor.
[0056] FIG. 9 is a flow chart explaining a sensing method of the weight of laundry according
to another exemplary embodiment of the present invention.
[0057] As illustrated in FIG. 9, steps 70, 71, 72, 73, 74, 75, 76, and 77 execute the same
operation as steps 50, 51, 52, 53, 54, 55, 56, and 57 shown in FIG. 7.
[0058] Additionally, if an AC power is unstable and thus an abnormal power voltage is generated,
the microprocessor 30 enters a standby state (step 78) instead of directly starting
a laundry weight sensing operation and judges whether a prescribed time, for example,
one to two seconds has elapsed (step 79). If the prescribed time has elapsed, the
microprocessor 30 proceeds to step 70 to re-execute the laundry weight sensing operation.
[0059] It is apparent that steps illustrated in FIG. 8 are identically applied to a process
to judge whether the abnormal voltage is generated in FIG. 9.
[0060] FIG. 10 is a flow chart explaining a sensing method of the weight of laundry according
to a further exemplary embodiment of the present invention.
[0061] As illustrated in FIG. 10, steps 80, 81, 83, 85, 87, 88, and 90 execute the same
operation as steps 50, 51, 52, 53, 54, 55, and 57 shown in FIG. 7. Additionally, whenever
each step ends, the microprocessor 30 monitors an AC power and judges whether an abnormal
power voltage is generated (steps 82, 84, 86, and 89). If the abnormal power voltage
is generated, corresponding steps are re-executed.
[0062] It is apparent that steps illustrated in FIG. 8 are identically applied to a processor
to judge whether the abnormal voltage is generated in FIG. 10.
[0063] As described above, since the laundry weight sensing process is re-performed when
a power voltage applied to the motor varies due to an unstable AC power being supplied
to the washing machine, the reliability of a laundry weight can be ensured and functions
in a washing process and a dehydrating process to which the laundry weight sensing
process is applied can be effectively executed.
[0064] Although a few embodiments of the present invention have been shown and described,
it would be appreciated by those skilled in the art that changes may be made in these
embodiments without departing from the scope of which is defined in the claims.
1. A sensing method of the weight of laundry in a washing machine (10) including a rotating
tub (12) and a motor (13) to rotate the rotating tub, the method comprising the following
steps:
i) sensing the weight of laundry by varying (51, 52, 54; 71, 72, 74; 81, 83, 87) a
speed of the motor (13) according to a laundry weight sensing process:
ii) judging (56, 76, 82, 86, 89) whether a power voltage supplied to the motor (13)
is abnormal while sensing the weight of laundry, and
iii) re-performing the sensing of the weight of laundry when the power voltage is
abnormal.
2. The method according to claim 1, wherein the judging of whether the power voltage
is abnormal counts (60) a detection time of a zero voltage using a timer (32) and
judges (63, 64) abnormality according to a difference (62) between a detection time
of a previous zero voltage and a detection time of a current zero voltage.
3. The method according to claim 2, wherein the judging of whether the power voltage
is abnormal includes:
determining (63, 64) whether the difference (62) is greater than a preset maximum
value or less than a preset minimum value; and
if the difference is greater than the maximum value or less than the minimum value,
judging (65) that the power voltage is abnormal.
4. The method according to claim 2, wherein, if an abnormal power voltage is generated,
the re-performing of the sensing of the weight of laundry is executed after a prescribed
standby time.
5. The method according to claim 2, wherein, if the laundry weight sensing process is
divided into a plurality of intervals, the judging of whether the power voltage is
abnormal is executed whenever each interval is performed, and if an abnormal power
voltage is generated, re-performing a corresponding interval.
6. A method according to claim 1, wherein step ii) comprises:
detecting a zero voltage of an alternating current (AC) power;
determining whether a power voltage is abnormal by comparing the difference (T) between
a detection time (ZCi-1) of a current zero voltage and a detection time (ZCi) of a previous zero voltage with a reference value (TMAX, TMIN).
7. The method according to claim 6, wherein the re-performing of the sensing of the weight
of laundry is executed, after waiting a set time from when the abnormal power voltage
is generated and the set time has elapsed.
8. A washing machine (10) including a rotating tub (12) and a motor (13) to rotate the
rotating tub, the washing machine comprising:
a power monitor (40) to generate a signal to monitor a power supplied to the motor
(13), and
a controller (30) to determine whether the power is abnormal according to the signal
received from the power monitor, and re-perform sensing of the weight of laundry when
the power is abnormal, and performing the method according to claim 1.
9. The washing machine according to claim 8, wherein the power monitor (40) is a zero-voltage
detector to detect a zero voltage of an AC power (20).
10. The washing machine according to claim 9, wherein the controller (30) includes a timer
(32) to count a detection time of a zero voltage of the zero-voltage detector (40)
and determines whether the power is abnormal according to a difference (T) between
a detection time (ZCi) of a previous zero voltage and a detection time (ZCi-1) of a current zero voltage, using the timer (32).
11. The washing machine according to claim 10, wherein the controller (30) judges that
the power is abnormal if the difference (T) is greater than a maximum value (TMAX) or less than a minimum value (TMIN).
12. The washing machine according to claim 8, additionally comprising an AC power (20)
to drive the motor;
a zero-voltage detector (40) as a power monitor to detect a zero voltage of the AC
power (20) and to generate a zero-voltage signal, and
a microprocessor (30) as said controller to determine whether the AC power (20) is
abnormal according to an input time of the zero-voltage signal and to re-perform sensing
of the weight of laundry when the AC power is abnormal.
13. The washing machine according to claim 12, wherein the microprocessor (30) includes
a timer (32) to perform a count operation according to the zero-voltage signal, and
judges that the AC power is abnormal due to abrupt power failure if a count value
of the timer (32) is greater than a first reference value.
14. The washing machine according to claim 12, wherein the microprocessor (30) includes
a timer (32)to perform a count operation according to the zero-voltage signal, and
judges that the AC power is abnormal due to noise contained in the power if a count
value of the timer (32) is less than a second reference value.
1. Messverfahren für das Wäschegewicht in einer Waschmaschine (10), die eine drehbare
Trommel (12) und einen Motor (13) zum Drehen der drehbaren Trommel aufweist, wobei
das Verfahren die folgenden Schritte umfasst:
i) Messen des Wäschegewichts durch Variieren (51, 52, 54; 71, 72, 74; 81, 83, 87)
einer Drehzahl des Motors (13) entsprechend einem Wäschegewicht-Messvorgang:
ii) Beurteilen (56, 76, 82, 86, 89), ob eine dem Motor (13) zugeführte Voltstärke
während des Messens des Wäschegewichts abnormal ist, und
iii) Erneutes Durchführen des Messens des Wäschegewichts, wenn die Voltstärke abnormal
ist.
2. Verfahren nach Anspruch 1, wobei das Beurteilen, ob die Voltstärke abnormal ist, eine
Ermittlungszeit einer Nullspannung unter Verwendung eines Timers (32) zählt (60) und
eine Abnormalität entsprechend einer Differenz (62) zwischen einer Ermittlungszeit
einer vorhergehenden Nullspannung und einer Ermittlungszeit einer aktuellen Nullspannung
beurteilt (63, 64).
3. Verfahren nach Anspruch 2, wobei das Beurteilen, ob die Voltstärke abnormal ist, beinhaltet:
Bestimmen (63, 64), ob die Differenz (62) größer als ein voreingestellter Maximalwert
oder kleiner als ein voreingestellter Minimalwert ist; und
wenn die Differenz größer als Maximalwert oder kleiner als der Minimalwert ist, Beurteilen
(65), dass die Voltstärke abnormal ist.
4. Verfahren nach Anspruch 2, wobei wenn eine abnormale Voltstärke erzeugt wird, das
erneute Durchführen des Messens des Wäschegewichts nach einer vorgeschriebenen Standby-Zeit
ausgeführt wird.
5. Verfahren nach Anspruch 2, wobei, wenn der Wäschegewicht-Messvorgang in eine Vielzahl
von Intervallen unterteilt ist, das Beurteilen, ob die Voltstärke abnormal ist, in
jedem Intervall durchgeführt wird und wenn eine abnormale Voltstärke erzeugt wird,
ein entsprechendes Intervall erneut durchgeführt wird.
6. Verfahren nach Anspruch 1, wobei Schritt ii) umfasst:
Ermitteln einer Nullspannung eines Wechselstroms (AC);
Bestimmen, ob eine Voltstärke abnormal ist durch Vergleichen der Differenz (T) zwischen
einer Ermittlungszeit (ZCi-1) einer aktuellen Nullspannung und einer Ermittlungszeit (ZCi) einer vorhergehenden Nullspannung mit einem Referenzwert (TMAX; IMIN).
7. Verfahren nach Anspruch 6, wobei das erneute Durchführen des Messens des Wäschegewichts
nach dem Abwarten einer voreingestellten Zeit ab Erzeugung der abnormalen Voltstärke
und nach Verstreichen der voreingestellten Zeit ausgeführt wird.
8. Waschmaschine (10) mit einer drehbaren Trommel (12) und einem Motor (13) zum Drehen
der drehbaren Trommel, wobei die Waschmaschine umfasst:
eine Stromversorgungsüberwachung (40) zum Erzeugen eines Signals zum Überwachen eines
dem Motor (13) zugeführten Storms, und
eine Steuerung (30) zum Bestimmen gemäß dem von der Stromversorgungsüberwachung empfangenen
Signal, ob der Strom abnormal ist, und erneutes Durchführen des Messens des Wäschegewichts,
wenn der Strom abnormal ist und Durchführen des Verfahrens nach Anspruch 1.
9. Waschmaschine nach Anspruch 8, wobei die Stromversorgungsüberwachung (40) ein Nullspannungsdetektor
zum Ermitteln einer Nullspannung eines Wechselstroms (20) ist.
10. Waschmaschine nach Anspruch 9, wobei die Steuerung (30) einen Timer (32) zum Zählen
einer Ermittlungszeit einer Nullspannung des Nullspannungsdetektors (40) aufweist
und gemäß einer Differenz (T) zwischen einer Ermittlungszeit (ZCi) einer vorhergehenden Nullspannung und einer Ermittlungszeit (ZCi-1) einer aktuellen Nullspannung unter Verwendung des Timers (32) bestimmt, ob der Strom
abnormal ist.
11. Waschmaschine nach Anspruch 10, wobei die Steuerung (30) beurteilt, dass der Strom
abnormal ist, wenn die Differenz (T) größer als ein Maximalwert (TMAX) oder kleiner als ein Minimalwert (TMIN) ist.
12. Waschmaschine nach Anspruch 8, des Weiteren umfassend einen Wechselstrom (20) zum
Antreiben des Motors;
einen Nullspannungsdetektor (40) als Stromversorgungsüberwachung zum Ermitteln einer
Nullspannung des Wechselstroms (20) und zum Erzeugen eines Nullspannungssignals, und
einen Mikroprozessor (30) als besagte Steuerung zum Bestimmen, gemäß einer Eingangszeit
des Nullspannungssignals, ob der Wechselstrom (20) abnormal ist und zum erneuten Durchführen
des Messens des Wäschegewichts, wenn der Wechselstrom abnormal ist.
13. Waschmaschine nach Anspruch 12, wobei der Mikroprozessor (30) einen Timer (32) zum
Durchführen eines Zählvorgangs gemäß dem Nullspannungssignal aufweist und aufgrund
eines abrupten Stromausfalls beurteilt, dass der Wechselstrom abnormal ist, wenn ein
Zählerwert des Timers (32) größer als ein erster Referenzwert ist.
14. Waschmaschine nach Anspruch 12, wobei der Mikroprozessor (30) einen Timer (32) zum
Durchführen eines Zählvorgangs gemäß dem Nullspannungssignal aufweist und aufgrund
eines in dem Strom enthaltenen Störsignals beurteilt, dass der Wechselstrom abnormal
ist, wenn ein Zählerwert des Timers (32) kleiner als ein zweiter Referenzwert ist.
1. Procédé de détection du poids du linge dans une machine à laver (10) incluant un tambour
rotatif (12) et un moteur (13) destiné à faire tourner le tambour rotatif le procédé
comprenant les étapes suivantes :
i) la détection du poids du linge en faisant varier (51, 52, 54 ; 71, 72, 74 ; 81,
83, 87) la vitesse du moteur (13) en fonction du processus de détection du poids du
linge,
ii) l'évaluation (56, 76, 82, 86, 89) de ce qu'une alimentation de puissance fournie
au moteur (13) est anormale lors de la détection du poids du linge, et
iii) l'exécution de nouveau de la détection du poids du linge lorsque l'alimentation
de puissance est anormale.
2. Procédé selon la revendication 1, dans lequel l'évaluation de ce que l'alimentation
de puissance est anormale compte (60) une durée de détection de tension nulle en utilisant
une horloge (32) et évalue (63, 64) une anomalie en fonction d'une différence (62)
entre la durée de détection d'une tension nulle précédente et la durée de détection
de la tension nulle actuelle.
3. Procédé selon la revendication 2, dans lequel l'évaluation de ce que l'alimentation
de puissance est anormale inclut :
la détermination (63, 64) de ce que la différence (62) est supérieure à une valeur
maximale préréglée ou inférieure à une valeur minimale préréglée, et
si la différence est supérieure à la valeur maximale ou inférieure à la valeur minimale,
l'évaluation (65) de ce que l'alimentation de puissance est anormale.
4. Procédé selon la revendication 2, dans lequel, si une alimentation de puissance anormale
est générée, l'exécution de la détection du poids du linge est exécutée de nouveau
après une durée prescrite d'attente.
5. Procédé selon la revendication 2, dans lequel, si le processus de détection du poids
du linge est divisé en une pluralité d'intervalles, l'évaluation de ce que l'alimentation
de puissance est anormale est exécutée à chaque fois que chaque intervalle est effectué,
et si une alimentation de puissance anormale est générée, c'est l'exécution à nouveau
de l'intervalle correspondant.
6. Procédé selon la revendication 1, dans lequel l'étape ii) comprend :
la détection d'une tension nulle sur une alimentation de puissance en courant alternatif
(AC),
la détermination de ce qu'une alimentation de puissance est anormale en comparant
la différence (T) entre la durée de détection (ZCi-1) entre la tension du courant d'une alimentation de puissance nulle et la durée de
détection (ZCi) de la tension précédente du courant d'une alimentation de puissance nulle avec une
valeur de référence (TMAX, TMIN).
7. Procédé selon la revendication 6, dans lequel l'exécution à nouveau de la détection
du poids du linge est exécutée après l'attente d'une durée de réglage à partir de
laquelle l'alimentation de puissance anormale est générée et le temps de réglage s'est
évanoui.
8. Machine à laver (10) incluant un tambour rotatif (12) et un moteur (13) destiné à
faire tourner le tambour rotatif, la machine à laver comprenant :
un moniteur de puissance (40 pour générer un signal destiné à surveiller une puissance
fournie au moteur (13), et
un contrôleur (30) afin de déterminer si la puissance est anormale en fonction du
signal reçu du moniteur de puissance, et l'exécution à nouveau de la détection du
poids du linge lorsque la puissance est anormale, ainsi que l'exécution du procédé
conforme à la revendication 1.
9. Machine à laver selon la revendication 8, dans laquelle le moniteur de puissance (40)
est un détecteur de tension nulle destinée à détecter le tension nulle d'une puissance
alternative (20).
10. Machine à laver selon la revendication 9, dans laquelle le contrôleur (30) inclut
une horloge (32) destinée à compter la durée de détection d'une tension nulle du détecteur
de tension nulle (40), et elle détermine si la puissance est anormale en fonction
de la différence (T) entre la durée de détection (ZCi) d'une précédente tension de courant nul et la durée de détection (ZCi-1) d'une tension de courant nul en utilisant l'horloge (32).
11. Machine à laver selon la revendication 10, dans laquelle le contrôleur (30) évalue
que la puissance est anormale si la différence (T) est supérieure à une valeur maximale
(TMAX) ou inférieure à une valeur minimale (TMIN) .
12. Machine à laver selon la revendication 8, comprenant de plus une alimentation de puissance
alternative (20) pour attaquer de moteur,
un détecteur de tension nulle (40) sous forme d'un moniteur de puissance pour détecter
la tension nulle de l'alimentation de puissance alternative (20) et générer un signal
de tension nulle, et
un microprocesseur (30) comme étant ledit contrôleur afin de déterminer si l'alimentation
de puissance alternative (20) est anormale en fonction d'une durée d'entrée du signal
de la tension nulle et pour exécuter de nouveau la détection du poids du linge lorsque
l'alimentation de puissance alternative est anormale.
13. Machine à laver selon la revendication 12, dans laquelle le microprocesseur (30) inclut
une horloge (32) afin d'exécuter une opération de comptage en fonction du signal de
tension nulle, et elle évalue que la puissance alternative est anormale en raison
de la défaillance brutale dans de puissance si la valeur de comptage de l'horloge
(32) est supérieure à une première valeur de référence.
14. Machine à laver selon la revendication 12, dans laquelle le microprocesseur (30) inclut
une horloge (32) afin d'effectuer une opération de comptage en fonction du signal
de tension nulle et elle évalue que la puissance alternative est anormale en raison
du bruit contenu dans l'alimentation de puissance si la valeur de comptage de l'horloge
(32) est inférieure à une seconde valeur de référence.