EP2840179B1 - Appareil de traitement du linge et procédé pour faire fonctionner un tel appareil - Google Patents

Appareil de traitement du linge et procédé pour faire fonctionner un tel appareil Download PDF

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Publication number
EP2840179B1
EP2840179B1 EP13180896.6A EP13180896A EP2840179B1 EP 2840179 B1 EP2840179 B1 EP 2840179B1 EP 13180896 A EP13180896 A EP 13180896A EP 2840179 B1 EP2840179 B1 EP 2840179B1
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EP
European Patent Office
Prior art keywords
drying
air blower
signal
cooling air
temperature
Prior art date
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Application number
EP13180896.6A
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German (de)
English (en)
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EP2840179A1 (fr
Inventor
Alessandro Vian
Christian Zavan
Michele Bisaro
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Electrolux Appliances AB
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Electrolux Appliances AB
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Priority to EP13180896.6A priority Critical patent/EP2840179B1/fr
Publication of EP2840179A1 publication Critical patent/EP2840179A1/fr
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/38—Time, e.g. duration
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/30—Blowers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 

Definitions

  • the present invention concerns the field of laundry treatment apparatus, such as laundry drying apparatus and/or laundry washing drying apparatus, to which the following description refers purely by way of example.
  • laundry treatment machines such as laundry drying machines or driers, i.e. laundry machines which dry laundry, or laundry washing and drying machines, i.e. laundry machines which wash, rinse and dry laundry
  • laundry treatment machine can be referred indiscriminately to a laundry drying machine, or to a laundry washing and drying machine.
  • a laundry drying machine comprises an outer casing; a laundry treatment chamber provided with a drying drum mounted inside the casing to rotate axially about a substantially horizontal axis, and positioned facing a laundry loading-unloading opening formed in the front face of the casing; a door hinged to the front face of the casing to rotate to and from a work position closing the opening in the front face and sealing the laundry drying drum; and an electric motor for rotating the laundry drying drum about its longitudinal axis inside the drying tub.
  • Laundry drying machines of the above type further comprise a heat-pump system designed to generate and circulate inside the drying drum, heated processing air which flows through the drum to rapidly dry the laundry inside.
  • the heat pump system comprises a first heat exchanger (evaporator) for heating a refrigerator fluid, a second heat exchanger (condenser) for cooling the refrigerant fluid, an expansion device and a refrigerant loop, in which the refrigerant fluid is circulated through the first and second heat exchangers and the expansion device.
  • a compressor is provided which is adapted to operate for circulating the refrigerant fluid through the refrigerant loop.
  • the heat pump system further comprises a heat pump system operation condition detection unit, such as one or more temperature sensing devices which are configured to sense temperatures associated with the operation of the heat pump system, and an electronic control unit which is configured to control the operation of the heat pump system during the drying cycle, based on the sensed temperatures and other known control parameters associated with the selected drying program.
  • a heat pump system operation condition detection unit such as one or more temperature sensing devices which are configured to sense temperatures associated with the operation of the heat pump system
  • an electronic control unit which is configured to control the operation of the heat pump system during the drying cycle, based on the sensed temperatures and other known control parameters associated with the selected drying program.
  • the latter further comprises a cooling air blower, i.e. a cooling fan, which carries off heat from one or more parts of the heat pump system, precisely from the compressor or from an auxiliary condenser, by means of ambient air, and is controlled by the electronic control unit based on a comparison between the operating temperatures and prefixed fan control temperature thresholds.
  • a cooling air blower i.e. a cooling fan
  • the electronic control unit switches on, or alternatively, off an electric fan motor to rotate the cooling fan, when the operating temperature is higher or respectively lower than prefixed fan control temperature thresholds, so that the compression device and/or an auxiliary condenser is cooled.
  • the fan control temperature thresholds are usually set with predefined values as a function of a nominal working temperature, i.e. 20 °C, which is the temperature of the ambient ordinary conditions in which the laundry drying machine is designed to normally operate. Such fan control temperature thresholds are used for all the selectable dring cycles.
  • the prefixed fan control temperature thresholds may cause the cooling fan to be switched-on too late and compressor may be cooled improperly with the concrete risk of an intervention of the compressor thermal protector, which causes still a further delay in completing the laundry drying process.
  • fan control temperature thresholds are varied as a function of the ambient temperature measured before starting the laundry drying cycle.
  • fan control temperature thresholds provided for operating the laundry drying machine in normal ambient conditions (i.e.
  • EP 2 333 149 discloses a laundry drying machine provided with a control unit controlling a cooling fan for cooling a portion of a heat pump system, wherein the fan control temperature thresholds are stored in a table, and may be modified based on the ambient temperature measured by temperature sensors.
  • the invention in a first aspect thereof, relates to a method for operating a laundry treatment apparatus, wherein the apparatus comprises a laundry treatment chamber for treating laundry by using processing air; a heat pump system for treating said processing air; a cooling air blower for blowing ambient air towards the heat pump system to cool at least a part thereof; at least one temperature sensing device for providing a first signal indicative of ambient temperature; a heat pump system operating condition detection unit for providing a second signal indicative of an operating condition of the heat pump system.
  • the method comprising providing an ambient temperature threshold; determining the ambient temperature based on the first signal; determining whether the ambient temperature satisfies a prefixed condition with the ambient temperature threshold; performing a cooling air blower control procedure based on the second signal.
  • the method further comprises: if said prefixed condition is determined, performing drying laundry for a first drying period; determining the second signal at the end of the first drying period; and, based on said determined second signal, providing control thresholds for said second signal to control said cooling air blower during a second drying period next to said first drying period.
  • the inventive method anticipates activation of the cooling air blower blowing ambient air inside the dryer with respect to a nominal ambient temperature operating condition, such that the humidity within the machine is reduced and condensation of moisture on sensitive components of the machine is avoided. Moreover, setting the temperature thresholds according to the current operating temperature determined when the cooling air blower is activated, makes the drying machine automatically adaptive to the ambient temperature conditions. In fact, the compressor temperature is kept around an optimum value to guarantee both an early cooling air blower activation to avoid humidity problems and high work temperature for achieving better drying performance from the heat pump system.
  • the method maintains cooling air blower deactivated during said first drying period. Maintaining the air blower deactivated during the first drying period increases energy-saving of the machine.
  • first and second temperature thresholds are set for said second signal with respective values which are greater than thresholds provided for controlling said cooling air blower during said second drying period; said cooling air blower control procedure being performed by selectively activating or deactivating said cooling air blower when said second signal is above said first threshold or respectively below said second threshold.
  • the method comprises the steps of: performing a first control cycle during the first drying period, wherein the first control cycle comprises: setting the first drying period; measuring the time of the drying cycle; performing said cooling air blower control procedure; when measured drying cycle time reaches the end of the first drying period, performing the steps of: stopping said cooling air blower control procedure; determining the second signal; varying said first and second thresholds based on said determined second signal.
  • the method comprises the step of performing a second control cycle during the first drying period, wherein the second control cycle comprises: setting the first drying period; measuring the time of the drying cycle; maintaining the cooling air blower deactivated; when measured drying cycle time reaches the end of the first drying period performing the steps of: stopping maintaining the cooling air blower deactivated; determining the second signal; varying said first and second thresholds based on said determined second signal; starting the second drying period wherein the cooling air blower control procedure is performed with the varied first and second thresholds.
  • the method comprises the step of performing a third control cycle during the first drying period wherein the third control cycle comprises: setting the first drying period; measuring the time of the drying cycle; maintaining the cooling air blower deactivated; during time measuring, performing the steps of: determining the second signal; if the second signal satisfies a prefixed condition with the first threshold: stopping maintaining the cooling air blower deactivated; determining the second signal; varying said first and second thresholds based on said determined second signal; starting the second drying period, wherein the cooling air blower control procedure is performed with the varied first and second thresholds.
  • the method further comprises: selectively performing said first, or second or third control cycle based on a user selected drying program and/or based on a differential temperature value which is determined by calculating the difference between the determined ambient temperature and the ambient temperature threshold.
  • the ambient temperature threshold is determined based on a user selected drying program or based on user input command performed by an input control panel.
  • the ambient temperature threshold is lower than a value comprised between 5°C and 15°C.
  • first drying period is set as a function of the time spent by the processing air escaped from the laundry treatment chamber through its seals, to start forming condensation in the internal parts of the apparatus the said prefixed condition is determined.
  • the first and second signals are provided by a temperature sensor arranged on the heat pump system.
  • first drying period is comprised between about 30 and 55 minutes.
  • the thresholds for said second signal are temperature thresholds.
  • the prefixed condition consists in that the ambient temperature determined on the basis of the first signal is lower than the ambient temperature threshold.
  • the invention in a second aspect thereof, relates to a laundry treatment apparatus comprising a laundry treatment chamber for treating laundry by using processing air; a heat pump system for treating said processing air; a cooling air blower for blowing ambient air towards the heat pump system to cool at least a part thereof; at least one temperature sensing device for providing a first signal indicative of ambient temperature; a heat pump system operating condition detection unit for providing a second signal indicative of an operating condition of the heat pump system (4); wherein a control unit is configured to implement the above method.
  • the at least one temperature sensing device operates as heat pump system operating condition detection unit
  • the method of the present invention has proved to be particularly advantageous when applied to a laundry drying apparatus, such as driers, as described below. It should be understood that although the method is described with reference to a laundry drying machine, other applications are contemplated. As can be appreciated, the present invention can be conveniently applied to other laundry treatment appliances, like for example laundry washing and drying machines (called also washer/driers).
  • the laundry washing machine 1 is a front loading laundry drying machine.
  • the present invention has proved to be particularly successful when applied to front loading laundry drying machines. It should in any case be understood that the present invention is not limited to this type of application. On the contrary, the present invention can be usefully applied to different types of drying devices, for example top loading laundry drying machines or top loading laundry washing and drying machines.
  • the laundry treatment apparatus 1 comprises an external housing or cabinet 2, and a laundry treatment chamber 3, which is arranged inside the cabinet 2 and is designed to contain laundry 19 to be treated by using a processing air A.
  • laundry treatment chamber 3 comprises a rotatable perforated drum 3, where the laundry 19 to be dried can be loaded.
  • Laundry treatment chamber 3 has a front access opening 5 closable by a door 7 preferably hinged to casing 2.
  • the laundry treatment apparatus 1 also comprises a process air blower or fan 8 for circulating the processing air A within the drum 3.
  • the laundry treatment chamber 3 and the process air blower 8 may be both rotated by a motor 32.
  • the motor(s) may be synchronous motor(s) or permanent magnet motor(s).
  • motor(s) may be variable speed motor(s), preferably controlled by an inverter device (not illustrated).
  • the laundry drying machine 1 is further provided with a heat pump system 4, comprising in a closed refrigerant loop 6 in this order of refrigerant flow B: a first heat exchanger 10 acting as evaporator for evaporating a refrigerant R and cooling processing air A, a compressor 14, a second heat exchanger 12 acting as condenser for cooling the refrigerant R and heating the processing air A, and an expansion device 16 from where the refrigerant R is returned to the first heat exchanger 10.
  • a heat pump system 4 comprising in a closed refrigerant loop 6 in this order of refrigerant flow B: a first heat exchanger 10 acting as evaporator for evaporating a refrigerant R and cooling processing air A, a compressor 14, a second heat exchanger 12 acting as condenser for cooling the refrigerant R and heating the processing air A, and an expansion device 16 from where the refrigerant R is returned to the first heat exchanger 10.
  • the heat pump system 4 may form the closed refrigerant loop 6 through which the refrigerant R in the heat pump system is circulated by the compressor 14 as indicated by arrow B. If the refrigerant R in the heat pump system 4 is operated in the transcritical or totally supercritical state, the first and second heat exchanger 10, 12 may act as gas heater and gas cooler, respectively.
  • the expansion device 16 may be a controllable valve that operates under the control of a control unit 30 ( Figure 2 ) to adapt the flow resistance for the refrigerant R in dependency of operating states of the heat pump system 4.
  • the expansion device 16 may be a fixed, non-controllable device like a capillary tube.
  • the process air flow within the treatment apparatus 1 is guided through the laundry treatment chamber 3, e.g. the perforated drum, which is designed to receiving articles to be treated.
  • the articles to be treated may be, for example, textiles, laundry 19, clothes, shoes or the like. In the embodiments here these are preferably textiles, laundry 19 or clothes.
  • the processing air flow is indicated by arrows A in Figure 2 and is driven by the process air blower or fan 8.
  • heat pump system 4 further comprises a process air channel 20 which guides the processing air flow A outside the drum 3 and is provided, in turn, with different sections, comprising the section forming the battery channel 20a in which the first and second heat exchangers 10, 12 are arranged.
  • the processing air exiting the second heat exchanger 12 flows into a rear channel 20b in which the processing air blower 8 is arranged.
  • the processing air conveyed by processing air blower 8 is guided upward in a rising channel 20c to the backside of the drum 3.
  • the air exiting the drum 3 through the drum outlet (which is the loading opening of the drum) may be filtered by a fluff filter 22 arranged close to the drum outlet in or at the channel 20.
  • the first heat exchanger 10 transfers heat from processing air A to the refrigerant R.
  • the processing air A which is cooled and dehumidified after passing the first heat exchanger 10, passes subsequently through the second heat exchanger 12 where heat is transferred from the refrigerant R to the process air A.
  • the process air A is sucked from exchanger 12 by the blower 8 and is driven into the drum 3 where it heats up the laundry 19 and receives the humidity therefrom.
  • the process air A exits the drum 3 and is guided in front channel 20d back to the first heat exchanger 10.
  • the main components of the heat pump system 4 may be arranged in a base section 9 or basement of the laundry treatment apparatus 1.
  • the components above disclosed of the heat pump system 41 are well-known elements provided in well-known drying machine and detailed description thereof will be omitted accordingly.
  • the laundry treatment apparatus 1 also comprises a cooling air blower 24 which is designed to carry off heat from parts of the heat pump system 4, by means of ambient air.
  • the cooling air blower 24 may be preferably arranged close to the compressor 14 to remove heat from the compressor 14, during a drying operation.
  • the cooling air flow C takes heat from (the surface of) the compressor 14.
  • the cooling air blower 24 may comprise a cooling blower or fan 36 which is driven by an electric fan motor 34 controlled by the control unit 30 of the dryer 1.
  • the laundry treatment apparatus 1 also comprises a temperature sensing device 27, which is designed to measure/detect the ambient temperature Tamb and provides a temperature signal indicative of measured ambient temperature.
  • a temperature sensing device 27 is designed to measure/detect the ambient temperature Tamb and provides a temperature signal indicative of measured ambient temperature.
  • ambient temperature is meant the temperature measured in the ambient or environment, where the laundry treatment apparatus 1 is arranged/located.
  • the ambient temperature may be indoor temperature.
  • the ambient temperature may be outside temperature or close to outside temperature.
  • temperature sensing device 27 may be arranged internal or external to the cabinet 2.
  • the temperature sensing device 27 may be arranged inside the cabinet 2.
  • sensing device 27 may be arranged in order to be distant from the heating sources/components of the heat pump system 4 (i.e. where the process air flows) so that the measured temperature is not affected by heat generated inside the apparatus 1.
  • temperature sensing device 27 may be arranged in an upper region of laundry treatment apparatus 1, for example at, or close to, or integrated with, an input control panel 38 preferably arranged, in turn, on the front wall of the cabinet 2.
  • sensing device 27 may be arranged in the bottom of the cabinet 2, for example in the air path of the cooling air C sucked-in by the cooling air blower 24 such that (at least after operating the blower 24 for a short time) the detected ambient temperature is directly related to the 'ambient temperature'.
  • the laundry treatment apparatus 1 may further comprise a temperature sensing device 28, which is configured to detect/measure/determine an operating temperature Tr associated with the operating of the heat pump system 4.
  • the temperature sensing device 28 may be configured to detect/measure/determine the operating temperature Tr associated with the refrigerant R (or of a temperature dependent on the refrigerant temperature) and provides a temperature signal indicative of the operating temperature Tr.
  • temperature sensing device 28 may be arranged at the compressor output and provides the control unit 30 the temperature signal indicating the measured operating temperature Tr.
  • temperature sensing device 28 may be arranged, for example, on the refrigerant fluid outlet position at the compressor 14, or on the compressor 14, or on the expansion device 16 or a position in the air flow A of the process air, or on the refrigerant fluid outlet of the first or second heat exchanger 10, 12.
  • the laundry treatment apparatus 1 may further preferably, although not necessarily, comprise a temperature sensing device 29 which is configured to detect/measure/determine the temperature of an electronic board preferably installed on, close to, the heat pump system 4, and provides the control unit 30 a temperature signal indicative of the temperature of said electronic board.
  • temperature sensing device 29 may be arranged for example on, close to, an electronic board, or an inverter unit (not illustrated) controlling one or more components of the heat pump system 4, or an inverter controlling the drum motor 32.
  • temperature sensing devices 27, 28 and 29 may comprise a temperature sensor or any similar/equivalent sensing/measuring device.
  • the temperature sensing devices 27, 28 and 29 may comprise a temperature dependent resistor, such as for example NTC and/or PTC thermistors. It should in any case be understood that temperature sensing devices 27 or 28 or 29 are not limited only to thermistors but, according to other possible embodiments of the present invention, they may comprise any kind of electric/electronic component/circuit designed to measure/determine a temperature.
  • the cooling air C may be sucked-in at the bottom of the cabinet 2 and conveyed towards the compressor 14 by the cooling fan 36 for cooling the compressor 14 or parts of the compressor 14.
  • the cooling air (at least partially passed over the compressor 14) exits the cabinet 2 through openings (not illustrated) arranged at the bottom and/or front side and/or rear side of the cabinet 2.
  • Figure 3 shows a schematically block diagram of components of the laundry treatment apparatus of Figures 1 and 2 , illustrating the control of the components of laundry drying machine 1.
  • the control unit 30 may be configured to control the operation of the components of the laundry treatment apparatus 1, i.e. the motor 32 driving the drum 3, the process air blower 8, the compressor 14, the valve 16 (optionally) and the motor 34 driving the fan 36, according to the selected drying program.
  • control unit 30 is further configured to: receive from the temperature sensing devices 27, 28 signals relating to the ambient temperature Tamb and operating temperature Tr, compare the received temperatures with a first and second temperature thresholds, hereinafter indicated with Tfan ON and Tfan OFF according to the method afterwards disclosed, switch-on the motor 34 rotating the fan 36 to cause the compressor 14 to be cooled or, alternatively, switch-off the motor 34 to stop rotation of the fan 36, based on results of comparison.
  • a first and second temperature thresholds hereinafter indicated with Tfan ON and Tfan OFF according to the method afterwards disclosed
  • a user may select a drying program or cycle, e.g. FAST, ECONOMY, IRON-AID, by the input control panel 38.
  • a drying program or cycle e.g. FAST, ECONOMY, IRON-AID
  • further inputs may be made, e.g. residue humidity, laundry amount or laundry type.
  • the control unit 30 may be configured to control the drum 3 and the process air blower 8 (speed) such that during the drying cycle the operation conditions of the laundry treatment apparatus 1 can be optimized in view of energy consumption/drying duration/drying result/component lifetime.
  • Figure 4 shows a flow chart illustrating a first embodiment of a method for operating a laundry treatment apparatus 1 as described above.
  • the compressor 14, the processing air blower 8, the motor 32 controlling the drum 3 and the cooling air blower 24 are in a rest state (switched off/deactivated) (step 100).
  • the method performs the step of determining/measuring the ambient temperature Tamb.
  • ambient temperature Tamb may be determined/measured based on the temperature signal provided by the temperature sensing device 27. It should be understood that detection of the ambient temperature Tamb may be performed when the temperature sensor 27 is considered to be in thermal equilibrium with the ambient surrounding the laundry treatment apparatus 1. Therefore, the ambient temperature Tamb detection may be performed in a period when the apparatus 1 is at rest, for example, in an interval between two drying processes which is, normally, at least one or more hours.
  • the ambient temperature Tamb detection may also be performed in the very first instants of time when the laundry treatment apparatus 1 has been switched-on, and/or when a drying program has been started but a drying effect on laundry has not yet substantially been carried out, i.e. before a drying cycle is started. It should be understood that the ambient temperature Tamb detection may be alternatively performed up to few seconds after the drum 3 and the process air blower 8 start rotating and a process air heating device is not yet active or it has been just activated but there has been no appreciable drying effect on laundry. Moreover, it should be understood that Tamb may be alternatively, or additionally, estimated/determined/measured on the basis of the temperature signals provided by each of temperature sensing devices 28 or 29.
  • both the refrigerant and components/parts of the heat pump system 4, such as the electronic boards, are in thermodynamic equilibrium with the environmental/ambient where the apparatus is placed, and temperature measured by each of the sensing devices 28 or 29 substantially corresponds to the ambient temperature Tamb.
  • appropriate algorithms may be used for estimating the actual ambient temperature Tamb based on temperature signals provided by sensors 27, 28, 29 available in the laundry treatment apparatus 1.
  • step 110 the method further performs the step of determining an ambient temperature threshold Ta THR .
  • the ambient temperature threshold Ta THR is indicative of a "cool ambient condition" of the ambient/environment which may cause the moisture contained in the processing air to condense on the sensitivity components/parts of the machine 1.
  • the method may determine the ambient temperature threshold Ta THR by reading a memory unit (not illustrated) wherein a prefixed value associated with the temperature threshold Ta THR is stored.
  • the temperature threshold Ta THR may be lower than about 15°C, preferably lower than 5°C.
  • the temperature threshold Ta THR may be determined based on the selected drying program. In such a case, for example, drying programs may be associated with respective ambient temperature thresholds Ta THR .
  • ambient temperature threshold Ta THR may be determined on the basis of an user input command performed by the input control panel 38.
  • the user may select, for example via a button arranged in the input control panel 38 or by any other similar input device, a level of the cool ambient condition, e.g. high cool level, medium cool level, and the method may set the ambient temperature threshold Ta THR based on the selected cool level.
  • the method After the ambient temperature threshold Ta THR has been determined/set, the method performs the step 120 of setting the first temperature threshold Tfan ON and the second temperature threshold Tfan OFF .
  • the values T1fan ON , T1fan OFF may be set at the working temperature of the refrigerant, i.e.
  • the first and second temperature thresholds Tfan ON , Tfan OFF may be set by defaults with values T1fan ON , T1fan OFF that cannot be exceeded by the heat pump refrigerant operating temperature, before the heat pump system has reached its stationary operative condition when working in "normal ambient condition” (warm or heat condition).
  • the first and second temperature thresholds Tfan ON , Tfan OFF may be set with values higher than about 50 °C, preferably 53°C or even more. It should in any case understood that values of the first Tfan ON and second temperature threshold Tfan OFF may be prefixed values stored in a memory unit (not illustrated) of the control unit 30.
  • the method ensures that when the cool ambient condition is detected, the cooling air blower is forced to be switched-off during a whole first drying period of the drying cycle, afterwards indicated with t1.
  • the cooling air blower may kept switched-off even by providing no thresholds Tfan ON ,Tfan OFF at all during a whole first drying period t1 of the drying cycle, even if the presence of thresholds Tfan ON ,Tfan OFF during such period t1 assures an intervention of the cooling air blower in case of an unexpected increase of the heat pump refrigerant temperature during period t1.
  • the method performs the step 130 of starting the drying cycle associated with a user selected drying program, wherein the selected drying cycle is applied to the compressor 14, the drum 3 and/or to the process air blower 8.
  • the method performs the step of switching-on the motor 32 to drive the drum 3 and the process air blower 8.
  • the apparatus 1 is provided with two driving motors, one for driving the drum 3 and the other one for driving the process air blower 8, the drum 3 and the process air blower 8 may be activated in different instances, e.g. first the rotation of the drum 3, and after a prefixed period (one or more minutes, for example), the process air blower 8.
  • the switching-on of the compressor 14 may be deferred with respect to the switching-on of the drum 3 and/or process air blower 8 motor(s).
  • step 140 After the drying cycle has been started, the method performs the step 140 of comparing the ambient temperature Tamb with the ambient temperature threshold Ta THR . It should be understood that in accordance with an embodiment, step 140 may be performed before the step 130.
  • the method detects a "normal ambient condition", i.e. a condition wherein the ambient may be considered “not-cool”, and there is a low percentage/amount of condensation of the processing air within the cabinet 2 out of the drum 3. Therefore the method detects the "normal ambient condition” and applies a "blow controlling procedure” hereinafter disclosed in detail, as from the step 150, wherein the cooling air blower 24 is controlled as a function of the first and second temperature thresholds T1fan ON , T1fan OFF assigned by default in step 120.
  • the method detects a "cool ambient state" and performs a control cycle wherein the first and second temperature thresholds Tfan ON , Tfan OFF are varied based on a operating temperature Tr measured after a first prefixed period t1 calculated from the beginning of the drying cycle is elapsed.
  • first interval t1 may have a prefixed value.
  • the first period t1 may be comprised between about 30 and 55 minutes. It should in any case be understood that the first period t1 may be estimated/set/determined as a function of the time spent by the processing air escaping from the drum 3 through its seals, to start forming condensation in the internal parts of the apparatus 1.
  • the method may determine the first period t1 based on some parameters associated with the condensation condition.
  • the method may determine the first drying period t1 based on: the measured ambient temperature Tamb, and/or the selected drying program, and/or several drying process parameters, such as the laundry moisture, and/or the temperature of processing air, and/or the rate of processing air provided to the drum 3.
  • the first interval t1 may be varied based on a prefixed mathematical function/curve in order to consider the moisture of the processing air and/or the ambient temperature.
  • data relating to laundry moisture, temperature of processing air, and processing air provided to the drum 3 may be provided to the control unit 30 by sensing systems (not illustrated), such as laundry moisture sensing system, temperature sensing system mounted in the machine 1.
  • sensing systems such as laundry moisture sensing system, temperature sensing system mounted in the machine 1.
  • Laundry moisture/temperature sensing systems are well-known devices provided in well-known drying machines and detailed description thereof will be here omitted accordingly.
  • laundry drying condition may be satisfied when measured laundry moisture reaches a prefixed laundry moisture threshold.
  • Laundry moisture may be measured by laundry moisture sensing device which is a well-known element provided in well-known drying machines and detailed description thereof will be here omitted accordingly.
  • step 180 the method performs the step 180, wherein it ends the drying cycle.
  • step 170 If laundry drying condition is not satisfied (output YES in step 170), i.e. the laundry is wet, the method performs the step 190 wherein it is verified whether the time counter TIME is zero. If not (output NO in step 190), the method performs a "blow controlling procedure" in step 200.
  • the "blow controlling procedure” (step 200), in general, comprises the step 300 wherein the heat pump system 4 operating temperature Tr is determined/measured through temperature sensing device 28.
  • the "blow controlling procedure” comprises the step 310, wherein the operating temperature Tr is compared with the first temperature thresholds Tfan ON .
  • first and second temperature thresholds Tfan ON Tfan OFF have respective values assigned by the present control method.
  • temperature thresholds Tfan ON Tfan OFF are those assigned in step 120. In particular, Tfan ON > Tfan OFF .
  • the method performs the step 320 of activating the cooling air blower 24 or keeps the cooling air blower 24 switched-on, whereas if the operating temperature Tr is above the first temperature thresholds Tfan ON (output NO in the step 310), the method performs the step 330 wherein the operating temperature Tr and the second temperature threshold Tfan OFF are compared.
  • the cooling air blower 24 is (kept) switched off (step 340). If the temperature Tr is above the second temperature thresholds Tfan OFF (output NO in the step 330) the "blow controlling procedure" ends (step 350).
  • the method forces the cooling air blower 24 to be maintained deactivated by the fan controlling procedure 200 because value T1fan ON is dimensioned so as to be above the operating temperature Tr during the whole first period t1. Therefore in such period t1, the blow controlling procedure implemented by the method, performs the steps 310, 330 and 350 so as to maintain the cooling air blower 24 deactivated, i.e. the electric fan motor 34 switched-off.
  • the method performs: the step 220 of measuring/determining the heat pump system 4 operating temperature Tr, and the step 230, wherein the first and the second temperature thresholds Tfan ON , Tfan OFF are varied based on the measured operating temperature Tr.
  • first temperature threshold Tfan ON is set with the operating temperature Tr
  • second temperature thresholds Tfan OFF is set with Tfan ON minus a prefixed value associated with an hysteresis value.
  • the second period t2 may be determined on the basis of the selected drying program.
  • Period t2 may be fixed as a maximum duration time of a drying cycle to prevent the apparatus from carrying out undesirably long laundry drying cycles, as it may happen in case the condition in the following step 240 described here below is always, or for an unacceptably long drying cycle time, verified (output YES in step 240).
  • the presence of step 150 also allows the apparatus to perform time controlled drying cycles. In the latter case, the following step 240 and its outputs can be removed from the flowchart of Figure 4 .
  • the method performs the step 240 of verifying whether the laundry drying condition is satisfied. If yes (output NO in step 240), the methods performs the step 180, i.e. ends the drying cycle, whereas if not (outputs YES in step 240), the method performs the step 250 of verifying whether the time counter TIME is zero. If not, (output NO in step 250) the method performs the "blow controlling procedure" 200 above disclosed and illustrated in Figure 8 . This time the cooling air blower 24 starts to be switched-on by the "blow controlling procedure" 200 because the first and second temperature thresholds Tfan ON , Tfan OFF have been varied on the basis of the current operating temperature Tr.
  • the "blow controlling procedure" 200 instead of forcing the cooling air blower 24 to stay deactivated/switched-off as in the whole first period t1, controls the electric fan motor 34 as a function of the first Tfan ON and second temperature threshold Tfan OFF modified on the basis of current temperature condition Tr of the heat pump system 4.
  • the method performs a calibration of the first and second temperature thresholds Tfan ON , Tfan OFF such that the cooling air blower 24 may be activated/switched-on when the working temperature of the heat pump system 4 is equal to the operating temperature detected/measured at the instant t1, and, at the same time, cooling air blower 24 may be deactivated/switched-off when the operating temperature of the heat pump system 4 is a prefixed hysteresis value below the operating temperature Tr detected/measured at the instant t1.
  • the method performs the "cycle end" step 180, wherein the drying cycle is interrupted.
  • a laundry cooling stage may be performed.
  • stopping of the drying cycle may preferably comprise turning off the heat pump system 4 such that heating of the processing air is stopped.
  • drum 4 may be kept turning, and non-heated air fed into drum 4 by the process air blower 8.
  • the method illustrated in figure 4 is configured to determine when drying cycle has to be stopped, by performing two different controls, i.e. a time control (step 250, 270) and laundry drying control (steps 170, 240).
  • a time control step 250, 270
  • laundry drying control steps 170, 240
  • the present invention is not limited to the double control to stop the drying cycle.
  • the method may be configured to perform one control, i.e. only the time control (steps 250, 270), or only the laundry drying control (steps 170, 240).
  • Laundry drying control may be performed in any known manner, such as by sensing laundry humidity within the drum 3 by conductimetric sensors arranged within the drum 3 to be repetitively contacted by laundry during a drying process.
  • Figure 5 illustrates an example diagram of the cooling air blower 24 control (in ideal apparatus 1 operating conditions) performed by the method in a "cool ambient condition" (Tamb ⁇ Ta THR ). More specifically, in Figure 5 , lines A and B relate to the first Tfan ON and second temperature thresholds Tfan OFF respectively, line C relates to the variation of the heat pump system 4 operating temperature Tr, as ideally detected by temperature sensing device 28, and line D relates to the cooling air blower 24 status which may be ON (when value is zero in ordinate right axis) or OFF (when value is 1 in ordinate right axis).
  • the first and second temperature thresholds Tfan ON and Tfan OFF have high values T1fan ON and T1fan OFF (about 53°C) and the temperature of the heat pump system 4 is rising, always remaining, however, below the high values T1fan ON and T1fan OFF such that the "blow controlling procedure" implemented by the method, forces the cooling air blower 24 to be maintained switched off during period t1.
  • the first and second temperature thresholds Tfan ON and Tfan OFF are varied (reduced) as a function of the current, i.e.
  • Figure 6 relates to a flow chart of a second embodiment of the method for operating the laundry treatment apparatus 1 which is similar to the first embodiment illustrated in Figure 4 , wherein the steps will be numbered, as much as possible, with the same numbers indicating of corresponding steps of the first embodiment.
  • the second embodiment of the method is configured to maintain the cooling air blower 24 deactivated during the whole first drying period t1 without however performing the "blow controlling procedure" 200 of Figure 8 .
  • the cooling air blower 24 is maintained deactivated during the whole first drying period t1 by performing a "time control" during a first part of the drying cycle.
  • the refrigerant temperature Tr is not compared repeatedly with the first and second temperature thresholds as in the step 200 of the first embodiment.
  • the second embodiment of the method does not have the step 200 in the first part, i.e. during the first drying period t1, and performs however the switching-off of the electric fan motor 34 during the whole first period t1.
  • first and second temperature thresholds Tfan ON and Tfan OFF are not taken into account in the first drying period t1, therefore step 120 is performed only to allow the control procedure to be inizialized..
  • Figure 7 relates to flow chart of a third embodiment of the method for operating the laundry treatment apparatus which is similar to the second embodiment illustrated in Figure 6 , wherein the steps will be numbered, as much as possible, with the same numbers indicating of corresponding steps of the second embodiment.
  • the third embodiment of the method differs from the second embodiment in that it performs an additional control during the first period t1 for preventing overheating condition of the heat pump system 4, in particular the compressor 14.
  • the method according to the third embodiment performs the step 500 of detecting/measuring the heat pump system 4 operating temperature Tr and the step 510 of comparing the measured operating temperature Tr with the first temperature threshold Tfan ON set in step 120 as described with reference to the first embodiment of the present invention. If the measured operating temperature Tr is below the first temperature threshold Tfan ON (output YES in step 510), the method continues to perform the steps 170,190, 500, 510 of the closed control ring until the time counter TIME reaches zero.
  • the method detects overheating condition of the heat pump system 4, in particular the compressor 14, and performs interrupting of the steps of the closed control ring, and starting the step 220 and the next steps, as described with reference to the first embodiment of the present invention.
  • the apparatus 1 may be configured to: determine a differential value ⁇ T which is indicative of the difference between the measured ambient temperature Tamb and the ambient threshold temperature Ta THR , and selectively perform the first embodiment, or the second embodiment or the third embodiment based on the determined differential value ⁇ T.
  • the first, second and third embodiments of the method may be selectively performed when differential values ⁇ T are ⁇ T1, ⁇ T2, ⁇ T3, respectively, wherein ⁇ T1> ⁇ T2> ⁇ T3.
  • first embodiment, or the second embodiment or the third embodiment may be performed by the method based on the drying program selected by a user.
  • first embodiment, or the second embodiment or the third embodiment may be selectively performed by the method on the basis of combined information about the determined differential value ⁇ T and the selected drying program.
  • the above disclosed laundry treatment apparatus is conveniently designed to vary the cooling air blower control temperature thresholds such that drying performances are ensured both at low and high ambient temperatures, and, at the same time, is able to limit/avoid condensation of moisture on electronic components of the apparatus 1.
  • the inventive method anticipates activation of the cooling air blower that blows ambient air inside the dryer such that the humidity is reduced and condensation of moisture on sensitive components of the apparatus is avoided.
  • setting the temperature thresholds according to the current, i.e. actual, heat pump system operating temperature determined when the cooling air blower is activated makes the drying machine automatically adaptive to the ambient temperature conditions.
  • the heat pump system temperature in particular the compressor operating temperature, is kept around an optimum value to guarantee both an early cooling air blower activation to avoid humidity condensation problems and high work temperature for achieving better drying performance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (16)

  1. Procédé pour faire fonctionner un appareil de traitement du linge (1), dans lequel l'appareil (1) comprend :
    - une chambre de traitement du linge (3) pour traiter du linge en utilisant de l'air de traitement (A) ;
    - un système de pompe à chaleur (4) pour traiter ledit air de traitement (A) ;
    - une soufflante d'air de refroidissement (24) pour souffler de l'air ambiant vers le système de pompe à chaleur (4) afin de refroidir au moins une partie de celui-ci ;
    - au moins un dispositif de détection de la température (27, 28, 29) pour fournir un premier signal indicatif de la température ambiante (Tamb) ;
    - une unité (28) de détection de l'état de fonctionnement du système de pompe à chaleur (4) pour fournir un deuxième signal (Tr) indicatif d'un état de fonctionnement du système de pompe à chaleur (4), le procédé comprenant les étapes suivantes :
    - fixer un seuil de température ambiante (TaTHR) ;
    - déterminer la température ambiante (Tamb) sur la base du premier signal ;
    - déterminer si la température ambiante (Tamb) satisfait une condition prédéfinie avec le seuil de température ambiante (TaTHR) ;
    - exécuter une procédure de commande de la soufflante d'air de refroidissement (24) sur la base du deuxième signal (Tr) ;
    le procédé étant caractérisé en ce que si ladite condition prédéfinie est déterminée, on exécute les étapes suivantes :
    - sécher le linge pendant une première période de séchage (t1) ;
    - déterminer le deuxième signal (Tr(t1)) à la fin de la première période de séchage (t1) ; et
    - sur la base dudit deuxième signal déterminé (Tr(t1)), fixer des seuils de commande (TfON, TfOFF) pour ledit deuxième signal (Tr) pour commander ladite soufflante d'air de refroidissement (24) pendant une deuxième période de séchage (t2) à la suite de ladite première période de séchage (t1).
  2. Procédé selon la revendication 1, comprenant l'étape de maintien de ladite soufflante d'air de refroidissement (24) désactivée pendant ladite première période de séchage (t1).
  3. Procédé selon la revendication 2, dans lequel :
    - avant de commencer la première période de séchage (t1), un premier et un deuxième seuils (TfON, TfOFF) sont fixés pour ledit deuxième signal (Tr) avec des valeurs respectives (T1fON, T1fOFF) qui sont plus grandes que des seuils (TfON, TfOFF) fournis pour commander ladite soufflante d'air de refroidissement (24) pendant ladite deuxième période de séchage (t2) ;
    - ladite procédure de commande de la soufflante d'air de refroidissement (24) étant exécutée en activant et en désactivant de façon sélective ladite soufflante d'air de refroidissement (24) lorsque ledit deuxième signal (Tr) est supérieur au premier seuil (TfON) ou respectivement inférieur audit deuxième seuil (TfOFF).
  4. Procédé selon la revendication 3, comprenant les étapes d'exécution d'un premier cycle de commande pendant la première période de séchage (t1), dans lequel le premier cycle de commande comprend les étapes de :
    - réglage de la première période de séchage (t1) ;
    - mesure du temps (TIME) du cycle de séchage ;
    - exécution de ladite procédure de commande de la soufflante d'air de refroidissement (24) ;
    lorsque le temps du cycle de séchage (TIME) mesuré atteint la fin de la première période de séchage (t1), on exécute les étapes de :
    - arrêt de ladite procédure de commande de la soufflante d'air de refroidissement (24) ;
    - détermination du deuxième signal (Tr(t1)) ;
    - variation desdits premier et deuxième seuils (TfON, TfOFF) sur la base dudit deuxième signal déterminé (Tr(t1)) ;
    - démarrage de la deuxième période de séchage (t2), dans laquelle la procédure de commande de la soufflante d'air de refroidissement (24) est exécutée avec les premier et deuxième seuils (TfON, TfOFF) modifiés.
  5. Procédé selon la revendication 3, comprenant l'étape d'exécution d'un deuxième cycle de commande pendant la première période de séchage (t1), dans lequel le deuxième cycle de commande comprend les étapes de :
    - réglage de la première période de séchage (t1) ;
    - mesure du temps (TIME) du cycle de séchage ;
    - maintien de la soufflante d'air de refroidissement (24) désactivée ;
    lorsque le temps de cycle de séchage (TIME) mesuré atteint la fin de la première période de séchage (t1), on exécute les étapes de :
    - arrêt du maintien de la soufflante d'air de refroidissement (24) désactivée ;
    - détermination du deuxième signal (Tr(t1)) ;
    - variation desdits premier et deuxième seuils (TfON, TfOFF) sur la base dudit deuxième signal déterminé (Tr(t1));
    - démarrage de la deuxième période de séchage (t2), dans laquelle la procédure de commande de la soufflante d'air de refroidissement (24) est exécutée avec les premier et deuxième seuils (TfON, TfOFF) modifiés.
  6. Procédé selon la revendication 3, comprenant les étapes d'exécution d'un troisième cycle de commande pendant la première période de séchage (t1), dans lequel le troisième cycle de commande comprend les étapes de :
    - réglage de la première période de séchage (t1);
    - mesure du temps (TIME) du cycle de séchage ;
    - maintien de la soufflante d'air de refroidissement (24) désactivée ;
    pendant la mesure du temps (TIME), on exécute les étapes de
    - détermination du deuxième signal (Tr) ;
    si le deuxième signal (Tr) satisfait une condition prédéfinie avec le premier seuil (TfON) :
    - arrêt du maintien de la soufflante d'air de refroidissement (24) désactivée ;
    - détermination du deuxième signal (Tr) ;
    - variation des premier et deuxième seuils (TfON, TfOFF) sur la base dudit deuxième signal déterminé (Tr) ;
    - démarrage de la deuxième période de séchage (t2), dans laquelle la procédure de commande de la soufflante d'air de refroidissement (24) est exécutée avec les premier et deuxième seuils (TfON, TfOFF) modifiés.
  7. Procédé selon les revendications 4, 5 et 6, comprenant les étapes d'exécution sélective dudit premier ou deuxième ou troisième cycle de commande sur la base d'un programme de séchage sélectionné par l'utilisateur et/ou sur la base d'une valeur de température différentielle (ΔT) qui est déterminée en calculant la différence entre la température ambiante déterminée (Tamb) et le seuil de température ambiante (TaTHR).
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit seuil de température ambiante (TaTHR) est déterminé sur la base d'un programme de séchage sélectionné par un utilisateur ou sur la base d'une commande entrée par l'utilisateur exécutée par l'intermédiaire d'un panneau de commande d'entrée (38).
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit seuil de température ambiante (TaTHR) est inférieur à une valeur comprise entre 5°C et 15°C.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel la première période de séchage (t1) est réglé en fonction du temps passé par l'air de traitement échappé de la chambre de traitement du linge (3) pour démarrer la formation de condensation dans les parties internes de l'appareil (1) lorsque ladite condition prédéfinie est déterminée.
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdits premier et deuxième signaux sont fournis par un détecteur de température (28) agencé sur le système de pompe à chaleur (4).
  12. Procédé selon l'une quelconque des revendications précédentes, dans lequel la première période de séchage (t1) est comprise entre 30 et 55 minutes.
  13. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdits seuils (TfON, TfOFF) pour ledit deuxième signal (Tr) sont des seuils de température.
  14. Procédé selon l'une quelconque des revendications précédentes, dans lequel ladite condition prédéfinie consiste en ce que la température ambiante (Tamb) déterminée sur la base du premier signal est inférieure au seuil de température ambiante (TaTHR).
  15. Appareil de traitement du linge (1), comprenant :
    - une chambre de traitement du linge (3) pour traiter du linge en utilisant de l'air de traitement (A) ;
    - un système de pompe à chaleur (4) pour traiter ledit air de traitement (A) ;
    - une soufflante d'air de refroidissement (24) pour souffler de l'air ambiant vers le système de pompe à chaleur (4) afin de refroidir au moins une partie de celui-ci ;
    - au moins un dispositif de détection de la température (27, 28, 29) pour fournir un premier signal indicatif de la température ambiante (Tamb) ;
    - une unité (28) de détection de l'état de fonctionnement du système de pompe à chaleur (4) pour fournir un deuxième signal (Tr) indicatif d'un état de fonctionnement du système de pompe à chaleur (4), caractérisé en ce qu'il comprend une unité de commande (30) configurée pour mettre en oeuvre un procédé selon l'une quelconque des revendications précédentes.
  16. Appareil de traitement du linge (1) selon la revendication 15, dans lequel ledit au moins un dispositif de détection de la température (28) fonctionne comme une unité de détection de l'état de fonctionnement du système de pompe à chaleur (4).
EP13180896.6A 2013-08-19 2013-08-19 Appareil de traitement du linge et procédé pour faire fonctionner un tel appareil Active EP2840179B1 (fr)

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US9285166B2 (en) * 2011-10-04 2016-03-15 Arcelik Anonim Sirketi Heat pump laundry dryer
CN112824578B (zh) * 2019-11-21 2024-02-06 重庆海尔滚筒洗衣机有限公司 一种衣物处理设备的控制方法及衣物处理设备
CN113293584A (zh) * 2020-02-21 2021-08-24 青岛海尔滚筒洗衣机有限公司 热泵系统的辅冷装置的控制方法及热泵式烘干设备
KR20220033167A (ko) * 2020-09-09 2022-03-16 삼성전자주식회사 건조기 및 그 제어방법

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JP2010104579A (ja) * 2008-10-30 2010-05-13 Toshiba Corp 洗濯機
DK2333149T3 (da) 2010-11-22 2014-01-06 V Zug Ag Tørretumbler med omgivelsestemperatursensor
PL2655726T3 (pl) * 2010-12-24 2016-04-29 Arcelik As Suszarka do prania z pompą ciepła
EP2586907B1 (fr) * 2011-10-31 2019-06-26 Electrolux Home Products Corporation N.V. Sèche-linge avec système de pompe à chaleur et recirculation d'air
DK2594684T3 (en) * 2013-02-01 2015-09-07 V Zug Ag Cleaning device with waste water tank, pump and temperature sensor

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