Laundry treating machine with siphon device

Abstract

This invention relates to garment handling machines, particularly washer-dryers, and methods for operating garment handling machines, particularly washer-dryers, during a drying cycle. A control unit is configured to control the drying cycle for garments received in the drying drum by: supplying liquid refill from a liquid supply arrangement to a liquid connection line in an amount sufficient to provide the air trap function of a siphon device; assessing the presence of a pressure signal event based on pressure signals received from a pressure sensor during a time period; determining the time elapsed since liquid refill; comparing the elapsed time with a refill time threshold; and, if a pressure signal event exists and the elapsed time is below the refill time threshold, performing one or more actions, including: pausing or stopping the drying cycle; providing information that the filter unit is not properly arranged in the air circulation arrangement; and / or pausing the assessment of the pressure signal.

Description

Technical Field

[0001] The present invention relates to garment handling machines, particularly washer-dryers, and a method for operating garment handling machines, particularly washer-dryers, during a drying cycle for drying garments. Background Technology

[0002] EP 1 715 095 B1 discloses a method for controlling the supply of water to the detergent tank of a washer-dryer using a solenoid valve, wherein the filling level of the siphon tube is detected by a level sensor. Pressure is measured when the blower is activated, and a comparative measurement is performed when the blower is not activated. Based on the difference between the pressure measurement and the comparative measurement, the solenoid valve is actuated to complete the filling step. Summary of the Invention

[0003] One object of the present invention is to provide a garment handling machine, particularly a washer-dryer, that has improved drying efficiency during the drying cycle.

[0004] The embodiments of the present invention are defined by key technical features. Specific embodiments of the present invention are defined by additional technical features.

[0005] According to an embodiment of the present invention, a garment handling machine, particularly a washer-dryer, is provided. The garment handling machine includes a tub; a drum arranged within the tub and adapted to receive garments for drying with dry air; an air circulation arrangement including the drum, the tub, and a dry air passage adapted to direct dry air from at least one air outlet at the drum or tub to at least one air inlet at the drum or tub; a dry air fan adapted to deliver dry air through the air circulation arrangement; a filter unit configured to be arranged in the air circulation arrangement to filter the dry air delivered by the dry air fan; a detergent dispenser adapted to store at least one treatment agent for garment handling; a liquid connection line connecting at least one outlet of the detergent dispenser to the interior of the tub or drum, wherein the liquid connection line includes a siphon device that, when filled with liquid, provides an air trap function to prevent air from passing through the siphon device; a liquid supply arrangement adapted to supply liquid to the liquid connection line; and a pressure sensor adapted to provide a pressure signal corresponding to the air pressure of the dry air at a location along the air circulation arrangement. In addition, the garment handling machine includes a control unit configured to control the drying cycle for garments received in the drying drum by: supplying liquid refill from a liquid supply arrangement to a liquid connection line, the liquid refill corresponding to a liquid amount sufficient to provide the air trap function of the siphon device; assessing the presence of a pressure signal event based on pressure signals received from a pressure sensor during a time period; determining the time elapsed since the liquid refill; comparing the time elapsed since the liquid refill with a refill time threshold; and if a pressure signal event exists and the elapsed time is below the refill time threshold, the control unit is also configured to perform one or more actions, including: pausing or stopping the drying cycle; providing information on the operating position of the filter unit if it is not properly arranged in the air circulation arrangement; and / or pausing the assessment of the pressure signal.

[0006] By stopping or pausing the drying cycle when a pressure signal event is present and the elapsed time is below the refill time threshold, the drying cycle can be prevented from continuing with reduced efficiency and / or lint reaching other parts of the garment handling machine.

[0007] Preferably, if a pressure signal event occurs and the elapsed time is less than a refill time threshold, the filter unit is determined not to be in the operating position before performing one or more actions. Alternatively, if a pressure signal event occurs and the elapsed time is less than a refill time threshold, the filter unit is determined not to be correctly positioned in the operating position before performing one or more actions.

[0008] When the filter unit is not in the operating position, or is not correctly positioned in the operating position, the air pressure of the drying air decreases, and therefore the drying efficiency during the drying cycle decreases. Therefore, when it is determined that the filter unit is not in the operating position (i.e., removed from or partially removed from the operating position), the control unit is preferably configured to pause the drying cycle until the filter unit is inserted / positioned in the operating position and the drying cycle continues. This prevents drying cycles from being performed when the filter is not in the operating position, which would result in lower drying efficiency. Therefore, the overall efficiency of the drying cycle can be improved by the garment handling machine (correspondingly applicable to the methods described below).

[0009] Furthermore, existing pressure sensors can be used to determine whether to perform one or more actions based on pressure events of pressure signals over a time period. Therefore, additional filter sensors for detecting filter unit malfunctions are unnecessary in garment processing machines, reducing machine costs and simplifying installation. Additionally, space required for such filter sensors can be saved in garment processing machines.

[0010] A filter unit "not in the operating position" can be defined as the filter unit not being arranged along the air circulation route or not being arranged correctly along the air circulation route, meaning that dry air is not being delivered or is only partially delivered through the filter unit. Therefore, in short, a filter unit malfunction can be detected by a pressure signal. A filter unit "in the operating position" can be defined as the filter unit being arranged along the air circulation route such that all or substantially all of the dry air is delivered through the filter unit.

[0011] The filter unit can be inserted into or removed from the air circulation arrangement. Preferably, when the filter unit is positioned in the operating position, it is arranged downstream of the drum and upstream of the condenser unit along the air circulation arrangement. The condenser unit can be a first heat exchanger, such as an evaporator in the case of a clothes handling machine with a heat pump system, or an air humidity condenser in the case of a clothes handling machine without a heat pump.

[0012] The filter unit can be configured to be inserted into a filter compartment positioned along the air circulation path, preferably downstream of the drum and / or upstream of the condenser unit. The filter unit can be implemented as a drawer, which is removably disposed within the filter compartment of the garment processing machine. In this case, when the filter unit is not in the operating position, this can mean that the filter unit implemented as a drawer is in the open state. When the filter unit is in the operating position, this can mean that the filter unit implemented as a drawer is in the closed state.

[0013] Preferably, when the control unit receives an input signal from the user indicating that the filter unit is in the operating position, the drying cycle is restarted after a pause or stop. More preferably, after placing the filter unit in the operating position, the user inputs a restart signal at the user control panel of the garment processing machine.

[0014] In other words, after the filter unit is inserted into its operating position or, if implemented as a drawer, the filter unit is inserted into the filter compartment causing the drawer to close, the drying cycle can be continued / restarted by the user's action. Preferably, after the drying cycle is continued / restarted, the pressure signal-based evaluation is restarted.

[0015] Preferably, if no pressure signal event occurs, it is determined that the filter unit is correctly positioned in the operating location within the air circulation arrangement.

[0016] Preferably, the washer-dryer further includes a heat pump system, wherein the heat pump system includes at least: a first heat exchanger adapted to cool the dry air for humidity condensation, a second heat exchanger adapted to heat the dry air, and a compressor adapted to circulate refrigerant through the first and second heat exchangers.

[0017] Preferably, one or more of the following components of the washer-dryer are arranged in or at the dry air passage: a heat exchanger for cooling the dry air (e.g., an evaporator or first heat exchanger of a heat pump system), a heat exchanger for heating the dry air (e.g., a condenser or second heat exchanger of a heat pump system), and a filter unit for filtering lint from the dry air.

[0018] Preferably, a detergent dispenser can supply one or more detergents and / or laundry treatment agents into the drum for treating the clothes received in the drum. The detergent or treatment agent can be solid or liquid, and is preferably stored in different compartments of the detergent dispenser.

[0019] Preferably, the liquid supply arrangement is adapted to supply liquid to the detergent dispenser and liquid connection lines. The liquid supply arrangement may include multiple valves for selectively supplying liquid to each compartment.

[0020] The bypass line can be arranged to connect the liquid supply arrangement directly to the liquid connection line, bypassing the detergent dispenser. In this example, the liquid supply arrangement can supply liquid to the liquid connection line without flushing the liquid, such as water, through one of the compartments. In this example, during liquid refilling, liquid can be supplied to the liquid connection line, and particularly to the siphon device, without directing the liquid through the detergent dispenser.

[0021] Alternatively, "supplying liquid to the detergent supply line" may include supplying liquid to the detergent supply line via one or more compartments of a detergent dispenser. Therefore, the liquid supply arrangement may be configured to supply liquid to the liquid connection line via a detergent dispenser.

[0022] The liquid connection line can be a detergent hose and / or flexible to compensate for movement of the tub relative to the detergent dispenser (which is preferably fixedly arranged in the cabinet of the washer-dryer).

[0023] The pressure sensor can be positioned anywhere along the air circulation path. For example, it can be positioned within a tank or drum, or along a dry air passage. The pressure sensor can be positioned anywhere along the air circulation path, such as along a dry air passage, or within a tank or drum. For example, it can be positioned within the drum's lift mechanism. The pressure sensor can be connected via a connecting wire to the bottom of the tank or reservoir, allowing liquid in the tank to partially enter the connecting line and increasing the pressure in the air column above the level corresponding to the liquid level in the tank (reservoir).

[0024] Before determining whether a pressure signal event exists, the pressure signal during that time period can be filtered using one or more signal filters, such as a low-pass filter.

[0025] The time period can be from 1 second to 10 minutes, preferably from 1 second to 5 minutes, more preferably from 5 seconds to 300 seconds, even more preferably from 10 seconds to 180 seconds, and most preferably from 20 seconds to 100 seconds.

[0026] Preferably, during this time period, and more preferably throughout the entire time period, the drying fan operates at a constant or substantially constant fan speed.

[0027] Preferably, the pressure signal-based evaluation is performed during a continuous time period within the drying cycle. More preferably, the pressure signal-based evaluation is performed during the continuous time period until a pressure signal event occurs during the time period. Preferably, the pressure signal-based evaluation is restarted after liquid refilling.

[0028] Preferably, the evaluation pressure signal is repeatedly, periodically, or permanently executed during the drying cycle to determine that the filter unit is not in an operating position.

[0029] The control unit can be adapted to control the operation of the garment processing machine and can be configured to receive and evaluate pressure signals. Alternatively, the control unit can be configured to send pressure signals or pressure signal data to a remote determination unit and subsequently be configured to receive a response from the remote determination unit. The remote determination unit can be any server, cloud function, remote mobile device, etc.

[0030] "Liquid refilling" can also be referred to as "siphon filling step". Preferably, the liquid supply arrangement supplies a predetermined amount of liquid, more preferably a predetermined adjustable amount of liquid, to the liquid connection line and, in particular, the siphon device.

[0031] Preferably, in each liquid refill step, the amount of liquid supplied to the siphon device via liquid refill is the same. Preferably, the liquid amount is such that when starting from an empty siphon device, the refill amount is higher than the minimum liquid level at which the air trap function occurs, i.e., the liquid level at which the siphon device is full of liquid. The air trap function prevents air exchange between the inside of the drum and the liquid connection line. In particular, the siphon device prevents moisture and / or lint-laden air from escaping from the drum to the detergent dispenser.

[0032] Preferably, the amount of liquid supplied during liquid refill is at least 10%, 15%, 20%, or 30% of the amount required to achieve full siphon function of the air trap. The amount of liquid supplied to the siphon via liquid refill can be selected to provide air replenishment to the liquid connection line without causing overflow. Therefore, overflow of the liquid connection line and liquid flowing from the liquid connection line into the tank are avoided during liquid refill.

[0033] Alternatively, the amount of liquid during refilling can be defined relative to the volume of liquid required to fill the siphon from a completely empty state to the level where the air trap function is activated (i.e., the siphon is full of liquid). According to this definition, the amount of liquid during refilling can be 50%, 80%, 100%, 120%, or 150% of the volume of liquid required to fill the siphon from a completely empty state to the level where the air trap function is activated (i.e., the siphon is full of liquid).

[0034] For example, the amount of liquid supplied to the siphon device during liquid refill can be in the range of 0.1 liters to 0.3 liters, 0.2 liters to 0.4 liters, 0.3 liters to 0.5 liters, or preferably 0.4 liters. These liquid refill amounts are particularly useful when the siphon device is configured to hold about 0.2 liters to 0.5 liters to the level that provides the air trap function, i.e., when the siphon device is full of liquid.

[0035] The duration of liquid refilling can range from 0.5 seconds to 20 seconds, preferably from 1 second to 10 seconds, and more preferably from 2 seconds to 5 seconds. In this case, the refilling rate can be from 5 liters / minute to 20 liters / minute, more precisely from 5 liters / minute to 10 liters / minute.

[0036] Preferably, the air circulation arrangement, and especially the dry air passage, is designed such that removing the filter unit from the operating position affects the pressure signal, resulting in a decrease in the pressure signal by at least 5%, preferably at least 10%, more preferably at least 20%, and even more preferably at least 30%, compared to when the filter unit is in the operating position.

[0037] Preferably, a pressure signal event is defined as occurring if, during the time period, the pressure signal amplitude is below a pressure signal amplitude threshold, and / or the pressure signal change is above a pressure signal change threshold. In both cases, it is assumed that action is required because the pressure signal indicates an anomaly caused by the filter unit not being properly positioned in the operating location or by the siphon device not providing an air trap function.

[0038] When the filter unit is not correctly positioned in the operating position, the air pressure of the dry air, and consequently the pressure signal, decreases, and pressure signal variations or noise may increase. By determining whether the filter unit is not in the operating position based on the pressure signal amplitude and / or pressure signal variations (signal noise), it is not necessary to provide an additional filter sensor for detecting the position of the filter unit. This simplifies the assembly of the garment processing machine and reduces its cost.

[0039] In the example, when determining the magnitude of the pressure signal during that time period, only the absolute value (or average absolute value) of the pressure signal is evaluated, for example, compared with a threshold, to determine whether a pressure signal event exists.

[0040] Preferably, the pressure signal amplitude threshold corresponds to a pressure signal value between the following pressure signal values: a pressure signal value corresponding to the siphon device being filled with liquid to provide the air trap function, and a lower pressure signal value resulting from the siphon device not being filled with liquid to not provide the air trap function.

[0041] Furthermore, the pressure signal amplitude threshold is preferably selected such that when the filter unit is not in the operating position, the pressure signal remains below the pressure signal amplitude threshold, regardless of the liquid level of the siphon device.

[0042] Preferably, the pressure signal amplitude threshold is selected such that the pressure signal exceeds the amplitude threshold only when the filter unit is in the operating position and there is a corresponding amount of liquid in the siphon device.

[0043] When the pressure signal change exceeds a certain threshold, the siphon can be in a so-called bubbling or gurgling state. The "bubbling / gurgling" state can be between a fully filled siphon and an underfilled siphon. In the fully filled state, the liquid level is above the level required for air trapping, preventing air and / or lint from passing through. In the underfilled state, the siphon does not provide air trapping / siphoning functionality, allowing air to pass through the liquid connection line from the drum to the detergent dispenser, and vice versa. Therefore, in the "bubbling / gurgling" state where the pressure signal change exceeds a certain threshold, air may sometimes pass through the siphon, potentially leading to air leakage, lint passing through the detergent drawer, and / or unwanted noise (sound) referred to as gurgling or bubbling. Thus, in the bubbling state, the siphon only partially provides air trapping functionality; some air may eventually flow through the siphon, causing gurgling sounds within the liquid. This can cause some air to leak through the siphon mechanism, for example, into the detergent drawer. Additionally, lint can also reach the detergent drawer through the siphon mechanism.

[0044] The pressure signal variation can be higher when the filter unit is not in the operating position compared to when the filter unit is in the operating position.

[0045] The elapsed time can be defined as the time between the (last) liquid refill and the end of the time period in which the pressure signal event occurred. Alternatively, the elapsed time can be defined as the time between the (last) liquid refill and the (current) time period. Furthermore, the elapsed time can be defined as the time between the (last) liquid refill and the beginning of the (current) time period.

[0046] Preferably, the refill time threshold should be selected such that if the time elapsed since the (last) liquid refill is less than the refill time threshold, it can be assumed that the air trap function of the siphon device still exists. That is, it is assumed that there is still a sufficient amount of undevaporated liquid in the liquid connection line to provide the air trap function of the siphon device.

[0047] In one example, the control unit is also configured to control the drying cycle for clothes received in the drying drum by providing liquid refill or further liquid refill from the liquid supply arrangement to the liquid connection line if a pressure signal event is present and the elapsed time is greater than a refill time threshold. The liquid refill or further liquid refill corresponds to an amount of liquid sufficient to provide the air trap function of the siphon device. Preferably, the refill time threshold should be selected such that if the elapsed time since the last liquid refill is greater than the refill time threshold, it cannot be assumed that the air trap function of the siphon device still exists. That is, due to the long elapsed time since the last liquid refill, such a large amount of liquid in the liquid connection line has evaporated that the air trap function of the siphon device may no longer exist, and therefore the pressure signal event may be caused by air leakage through the siphon device. Therefore, if the elapsed time since the last liquid refill is greater than the refill time threshold, it is preferable to provide (further) liquid refill, corresponding to an amount of liquid sufficient to provide the air trap function of the siphon device.

[0048] The refill time threshold can be less than 30 minutes, preferably in the range of 30 seconds to 20 minutes, more preferably in the range of 2 minutes to 15 minutes, and most preferably in the range of 3 minutes to 10 minutes.

[0049] Preferably, if a pressure signal event occurs, the pressure signal amplitude is below a pressure signal amplitude threshold and / or the pressure signal change is above a pressure signal change threshold, and the elapsed time is above a refill time threshold, the control unit is configured to provide further liquid refill from the liquid supply arrangement to the liquid connection line, the further liquid refill corresponding to a liquid amount sufficient to provide the air trap function of the siphon device.

[0050] If the pressure signal amplitude is below the pressure signal amplitude threshold and the elapsed time is above the refill time threshold, the pressure signal amplitude being below the predetermined threshold may be due to the following reason: during the drying cycle, the liquid level in the siphon device decreases due to evaporation over time, causing the air trap function to cease, allowing (drying) air to pass through the siphon device. Therefore, by taking the elapsed time into account, the control unit can avoid incorrectly determining that the filter unit is not in the operating position. This means that erroneous stops or pauses in the drying cycle can be avoided, and thus the drying efficiency of the drying cycle can be improved. It also prevents unnecessary user intervention to continue the drying cycle.

[0051] In one example, after further liquid refilling, the control unit is adapted to assess the presence of a pressure signal event based on the pressure signal during a subsequent time period, and if present, determine that the filter is not in the operating position.

[0052] Therefore, the number of times liquid is refilled during the drying cycle can be reduced, which reduces the amount of liquid used during the drying cycle.

[0053] By stopping or pausing the drying cycle when the filter is not in the operating position, lint can be prevented from reaching the heat pump or condenser unit of the garment handling machine. Furthermore, the filter not being in the operating position causes a pressure loss in the drying air, which reduces drying efficiency. Therefore, stopping or pausing the drying cycle avoids continuing the drying cycle with reduced efficiency due to the filter not being in the operating position.

[0054] Preferably, determining the pressure signal variation includes: determining the deviation between the pressure signal amplitude value during the time period and the average value of the pressure signal amplitude value during the time period; determining the root mean square (RMS) or mean square error (MSE) of the pressure signal amplitude value that deviates from the average value of the pressure signal amplitude during the time period; or determining the difference between the maximum and minimum values ​​of the pressure signal amplitude during the time period.

[0055] Before comparing the pressure signal changes during the time period with a pressure signal change threshold, the pressure signal changes can be filtered using a filter such as a low-pass filter. For example, the filtered pressure signal changes (e.g., low-pass filtered pressure signal changes) are determined, and the difference is calculated as the difference between the pressure signal changes and the filtered pressure signal changes. Preferably, the average pressure signal change (noise) is calculated during the time period.

[0056] Preferably, the pressure sensor is fluidly connected to the bottom of the tub or a reservoir, and the pressure sensor is also adapted to provide a pressure signal corresponding to the pressure caused by the liquid in the tub during a wash cycle for washing clothes received in the drum. This means that the same pressure sensor can be used to measure the pressure of the drying air during the drying cycle and to measure the liquid level in the tub during the washing cycle. This eliminates the need for two separate sensors, thereby reducing the cost of the machine and simplifying its installation.

[0057] Preferably, during this time period, and more preferably throughout the entire time period, the drying air fan operates at a constant or substantially constant air fan speed. A constant drying fan speed preferably means that the fan speed is not changed during this time period. Changes in fan speed will alter the pressure in the barrel and will therefore distort the pressure signal, thereby also distorting the results of evaluating the pressure signal during this time period.

[0058] In one example, after the air fan speed changes, it is preferable to wait for a stable period of time before performing the evaluation of the pressure signal during that period.

[0059] Preferably, the pressure signal change threshold and / or pressure signal amplitude threshold during this time period depends on the fan speed of the drying fan during this time period. Preferably, if the fan speed increases, the pressure signal change threshold and / or pressure signal amplitude threshold increases, and / or if the fan speed decreases, the pressure signal change threshold and / or pressure signal amplitude threshold decreases.

[0060] Preferably, a minimum fan speed is set during this time period to generate a reasonable / detectable pressure signal level under normal operating conditions, where the siphon device is filled with liquid and the filter is in its operating position. For example, the minimum fan speed may be at least 500 rpm, 1000 rpm, 2000 rpm, 2500 rpm, 2800 rpm, 3000 rpm, 3400 rpm, or 3800 rpm.

[0061] For example, when the air fan speed increases, the pressure of the dry air in the air circuit can increase, thus increasing the amplitude of the pressure signal, and vice versa, and / or increasing the change in the pressure signal. Therefore, when a higher level of fan speed is applied during the drying cycle (compared to the previous air fan speed), the pressure signal amplitude threshold and / or pressure signal change threshold can increase. When a lower dry air fan speed is applied during the drying cycle (compared to the previous air fan speed), the pressure signal amplitude threshold and / or pressure signal change threshold can decrease.

[0062] Preferably, the drain pump of the laundry handling machine, configured to discharge liquid from a drum, is activated or deactivated during the time period, preferably throughout the entire time period. Changes in the operation of the drain pump (e.g., starting or stopping the drain pump) can cause changes in the pressure signal of the dry air, and thus distort the pressure signal, and consequently, the results of pressure signal evaluation. The control unit can be configured to adapt pressure signal amplitude thresholds and / or pressure signal change thresholds based on whether the drain pump is activated or deactivated during the time period.

[0063] According to another aspect, a method is provided for operating a garment handling machine, particularly a washer-dryer, during a drying cycle for drying clothes. The garment handling machine includes: a drum; a roller arranged inside the drum and adapted to receive garments for drying with dry air; an air circulation arrangement including the roller, the drum, and a dry air passage adapted to direct dry air from at least one air outlet at the roller or drum to at least one air inlet at the roller or drum; a dry air fan adapted to deliver dry air through the air circulation arrangement; a filter unit configured in the air circulation arrangement to filter the dry air delivered by the dry air fan; a detergent dispenser adapted to store at least one treatment agent for garment handling; a liquid connection line connecting at least one outlet of the detergent dispenser to the interior of the drum or roller, wherein the liquid connection line includes a siphon device that provides an air trap function to prevent air from passing through the siphon device when filled with liquid; a liquid supply arrangement adapted to supply liquid to the liquid connection line; and a pressure sensor adapted to provide a pressure signal corresponding to the air pressure of the dry air at a location along the air circulation arrangement. The method includes: supplying liquid refill from a liquid supply arrangement to a liquid connection line, the liquid refill corresponding to a liquid volume sufficient to provide the air trap function of the siphon device; assessing the presence of a pressure signal event based on a pressure signal received from a pressure sensor during a time period; determining the time elapsed since the liquid refill; comparing the time elapsed since the liquid refill with a refill time threshold; and if a pressure signal event exists and the elapsed time is below the refill time threshold, performing one or more actions, including: pausing or stopping the drying cycle; providing information on the operating location of the filter unit that is not properly arranged in the air circulation arrangement; and / or pausing the assessment of the pressure signal.

[0064] Preferably, the garment handling machine includes a control unit adapted to control the operation of the garment handling machine, and in particular, the control unit is configured to receive and evaluate pressure signals during a time period.

[0065] In one example, the method further includes determining that the filter unit is not in an operating position before performing one or more actions if a pressure signal event exists and the elapsed time is below a refill time threshold.

[0066] In another example, a pressure signal event is defined as occurring when the following conditions are met during a time period: the pressure signal amplitude is below a pressure signal amplitude threshold; and / or the pressure signal change is above a pressure signal change threshold.

[0067] In yet another example, the refill time threshold is less than 30 minutes, preferably in the range of 30 seconds to 20 minutes, more preferably in the range of 2 minutes to 15 minutes, and most preferably in the range of 3 minutes to 10 minutes.

[0068] In another example, the method further includes: if a pressure signal event is present and the elapsed time is greater than a refill time threshold, providing liquid refill or further liquid refill from the liquid supply arrangement to the liquid connection line, the liquid refill or further liquid refill corresponding to a liquid amount sufficient to provide the air replenishment function of the siphon device.

[0069] In yet another example, determining the pressure signal variation includes: determining the deviation between the pressure signal amplitude value during the time period and the average pressure signal amplitude value during the time period; determining the root mean square (RMS) or mean square error (MSE) of the pressure signal amplitude value that deviates from the average pressure signal amplitude during the time period; or determining the difference between the maximum and minimum pressure signal amplitude values ​​during the time period.

[0070] Each individual feature of the garment handling machine may be combined with the method, or any subgroup of features of the garment handling machine (i.e., functions; for example, any additional technical features) may be combined with the method individually. Conversely, any individual feature or subgroup of features of the method (e.g., any of the additional technical features) may be combined with the garment handling machine.

[0071] Any feature disclosed herein (with respect to the above embodiments and / or configurations, as well as the detailed embodiments and modifications described below) may be combined with the claimed subject matter individually or in any sub-combination. If the conjunction "and / or" is used herein, all logical elements and combinations are disclosed individually. For example, a, b, and / or c disclose elements / combinations a, b, c, ab, ac, bc, and abc. Attached Figure Description

[0072] For detailed reference to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings, which illustrate:

[0073] Figure 1 This is a front-view 3D diagram of a washer-dryer.

[0074] Figure 2 yes Figure 1 The exploded front view of the washer-dryer shown.

[0075] Figure 3 yes Figure 1A perspective view of the lower side of the top unit of a washer-dryer, which is arranged above the tub and below the top cover and supports several components of the washer-dryer.

[0076] Figure 4 It is to be in Figure 1 The liquid connection lines with siphon devices used in washer-dryers

[0077] Figure 5 It is shown Figure 1 A schematic block diagram showing the arrangement of the components of a washer-dryer.

[0078] Figure 6 This is a block diagram of several components of a washer-dryer.

[0079] Figure 7 This is a graph showing the relationship between pressure signal and time, depending on the location of the filter unit;

[0080] Figure 8 This is a graph showing the relationship between pressure signals and time at different air fan speeds of a dry air fan;

[0081] Figure 9 This is a schematic flowchart illustrating a method for operating a garment processing device according to an embodiment.

[0082] Figure 10 This is a graph showing the relationship between pressure signal and time, depending on the state of different siphon devices;

[0083] Figure 11 This is a schematic flowchart illustrating a method for operating a garment processing device according to another embodiment. Detailed Implementation

[0084] Figure 1 A perspective front view of an illustrative garment handling machine (such as washer-dryer 2) for explaining the present invention is shown. Unless otherwise described in more detail herein, further details of washer-dryer 2 are described with reference to EP 2 843 100 A1.

[0085] The washer-dryer 2 described herein includes a heat pump system 32 for condensing moisture from dry air and for heating the dry air. However, in other embodiments, an electric heater or radiator may be provided for heating the dry air, and a heat exchanger (e.g., an air / air heat exchanger) may be provided instead of the heat pump system 32 and its components (see below) for cooling the dry air. In the embodiment explained in detail, the washer-dryer 2 has a drum 58 having a horizontal axis or an axis inclined relative to the vertical direction, such that when the drum 58 rotates, clothes tumble within the drum 58. However, the invention can also be implemented in a washer-dryer having a drum that rotates about a vertical axis.

[0086] from Figure 1 As can be seen, the washer-dryer 2 has a loading opening 4 behind the door 6, wherein clothes 60 are loaded into the drum 58 when the door 6 is open. The door 6 can be opened by pulling on the handle 8. The appearance of the washer-dryer 2 is given or formed by the cabinet 10 or housing, which includes a front wall 12, side walls 14 (only one of the two opposing side walls is shown), a top cover 16, and a rear wall and bottom cover (the rear wall and bottom cover are not shown). The upper part of the front wall 12 may include a display and / or an input panel 18 having a program selector 20 and several option selectors 22 or buttons. The washer-dryer 2 may also include a filter unit 26 configured to be positioned in the air circulation arrangement in the operating position to filter the dry air delivered by the dry air fan 48. The front wall 12 may include a filter compartment cover 24 that covers a filter compartment 25, in which the filter unit 26 or a lint filter (see Figure 2 The filter unit 26 can be implemented as a drawer. The front wall 12 may include the front cover of the detergent drawer 28.

[0087] Under normal operating conditions of the washer-dryer, the filter unit 26 is positioned in the operating position, meaning that the filter unit 26 is arranged along the air circulation route so that dry air is supplied through the filter unit 26 and / or the filter unit 26, implemented as a drawer, is in a closed state, i.e., the filter unit 26 is properly inserted into the filter compartment 25 to filter the dry air. Alternatively, the filter unit 26 may not be in the operating position, meaning that the filter unit 26 is not properly arranged along the air circulation route to filter the dry air. In other words, dry air is not supplied or is only partially supplied through the filter unit 26. Alternatively, the filter unit 26, implemented as a drawer, is in an open state, i.e., the filter unit 26 is not properly inserted into the filter compartment 25. As further explained below, a pressure signal provided by the pressure sensor 74 can be used to determine whether the filter unit 26 is not in the operating position.

[0088] Figure 2 An exploded perspective view of the washer-dryer 2 is shown, in which the top cover 16 is lifted to reveal the top unit 30, which includes a portion of the heat pump system 32. Figure 2 The diagram shows the state in which the filter unit 26 is pulled out of the filter compartment 25 by pulling it out via the filter compartment cover 24. In addition to the filter unit 26, a mesh filter 26a may be provided in the air guide path toward the heat exchanger.

[0089] The top unit 30 can support several components of the washer-dryer, which may be primarily sandwiched between the top shell 34 or cover (raised in the exploded view) and the lower shell 36 or tray. A portion of the dry air passage 50 may be formed between the top shell 34 and the lower shell 36. In the flow direction of this portion of the dry air passage 50, a filter compartment 25 may be provided, in which dry air passes through filter unit 26 and mesh filter 26a before entering the first heat exchanger 38 (which is preferably the evaporator or air humidity condenser of the heat pump system 32), and then enters the second heat exchanger 40. The second heat exchanger 40 may be the condenser of the heat pump system 32, or, in the case of a washer-dryer without a heat pump system as described above, may be replaced by an electric heater.

[0090] Figure 3 A perspective view of the lower side of the top unit 30 (particularly the lower side of the lower housing 36) is shown. The washer-dryer may include a dry air fan 48 or blower and a fan motor 78 for delivering dry air within a dry air passage 50 (and particularly along an air circulation arrangement including the dry air passage 50, the drum 58, and the tub 52). The dry air fan 48 and preferably the fan motor 78 may be arranged on the lower side of the lower housing 36. The passage, together with the drum 58 and / or the tub 52, forms a closed loop for circulating dry air by the movement of the fan 48. The outer side of the dispenser compartment 92 can be seen, in which a detergent dispenser 90 is slidably arranged. An inlet 96 for access to a liquid connection line 94* may be provided at the rear side of the dispenser compartment 92 (when viewed from the front of the washer-dryer). When liquid is supplied to the detergent compartment of the detergent dispenser 90, the liquid mixed with detergent is flushed through inlet 96 into liquid connection line 94*, from liquid connection line 94* through outlet 98, and from outlet 98 into the interior of tub 52. A bellows 100 is preferably disposed in liquid connection line 94*, which dampens vibrations of tub 52 and thus prevents mechanical motion from being transmitted from tub 52 to top unit 30. Liquid connection line 94* may include lint trap 102* (not further described here), as according to current improved washer-dryers, lint trap 102* is composed of... Figure 4 The siphon device 102 shown is used instead.

[0091] like Figure 3 As shown, a portion of a drying air passage 50 is provided in the lower right region of the top unit 30. This passage guides dry air from the fan 48 of the top unit 30 toward a bellows (not shown) forming part of the loading opening 4, allowing the dried and heated air to be supplied directly from the top unit 30 to the interior of the drum 58. Another portion of the drying air passage 50, which guides dry air from the barrel 52 toward the top unit 30 and where it first passes through the filter unit 26 (which is connected to the barrel's casing), is shown in the middle of the top unit 30 and partially concealed by the liquid connection line 94*.

[0092] However, regarding Figure 2 and Figure 3 Some components of the described washer-dryer can be alternatively arranged in other locations within the washer-dryer, such that some components are not connected to the top unit 30. For example, the first heat exchanger and / or the second heat exchanger can be arranged at least partially below the drum, i.e., within the base of the washer-dryer. In this case, dry air can pass through the dry air passage as described above, first entering the filter unit and then the first and second heat exchangers, before returning to the drum. Furthermore, a dry air fan and / or fan motor can be arranged in other locations within the washer-dryer for delivering dry air within the dry air passage.

[0093] Figure 4 A liquid connection line 94 is shown, which preferably replaces, for example, Figure 3 The liquid connection line 94* is shown. An inlet 96 from the detergent dispenser 90 and an outlet 98 to be connected to the casing of the tank 52 are shown. As described above, Figure 3 The lint trap 102* shown is replaced by a siphon device 102. Therefore, the liquid connection line 94 includes a siphon device 102. The siphon device 102 is designed such that the liquid (water) level WL (which corresponds to the minimum amount of liquid to be filled into the siphon device to enable the siphon device function (also known as the air trap function) in the liquid connection line 94) prevents air from passing between the inlet 96 and the outlet 98. That is, if the siphon device 102 is filled with liquid (hereinafter sometimes referred to as water) up to the level WL, air cannot flow between the detergent dispenser 90 or the interior of the dispenser compartment 92 and the tank 52, and vice versa. In the following, the condition when the siphon device 102 is filled to the level WL such that air cannot flow between the interior of the detergent dispenser 90 and the tank 52, or vice versa, will be referred to as the siphon device 102 being filled with liquid.

[0094] Furthermore, when the pressure difference between inlet 96 and outlet 98 is low, air cannot pass through. However, if the pressure difference between inlet 96 and outlet 98 increases, the water column within the siphon 102 moves towards either the distributor compartment 92 or the tank 52, depending on the direction of the pressure difference. In the latter case, i.e., if the water column moves towards the tank 52, water can flow into the tank 52, which reduces the amount of water in the siphon 102 and may ultimately result in the actual water level being below the indicated water (liquid) level WL, and the air trap function not being provided, allowing air to pass between inlet 96 and outlet 98; i.e., the siphon 102 is not filled with liquid. When the current water level within the siphon 102 is below the minimum level (e.g., WL), dry air carrying moisture and lint from the clothes dryer can exit the tank 52 towards the distributor compartment 92 and enter the interior and / or exterior of the cabinet 10 from the distributor compartment 92, potentially causing undesirable contamination with condensation and / or lint.

[0095] Figure 5 The components of a washer-dryer 2 are schematically shown. In the case where the washer-dryer 2 includes a heat pump system 32, the heat pump system 32 has a refrigerant circuit 42 through which refrigerant circulates via the pumping activity of the compressor 44. Refrigerant leaving the compressor 44 flows through a second heat exchanger 40. Refrigerant leaving the second heat exchanger 40 can flow through an expansion device 46. Refrigerant leaving the expansion device 46 can flow through a first heat exchanger 38 and then return to the suction port of the compressor 44.

[0096] Dry air A supplied by fan 48 can be guided through air inlet 56 into barrel 52 within a portion of channel 50. However, as described above, in... Figures 1 to 4 In the detailed embodiment of the washer-dryer 2 shown, a portion of the drying passage from the fan 48 is preferably guided through a bellows at the front of the machine, wherein the bellows partially surrounds the loading opening 4. In this case, the bellows or gasket provides an air inlet 56, allowing drying air to enter directly into the interior of the drum 58.

[0097] The dry air that has passed through roller 58 can be discharged through air outlet 54 (shown schematically only on the front side). Air outlet 54 may be generally located in the middle and upper part of the casing of barrel 52. Dry air can be guided from air outlet 54 along a portion of channel 50 through filter unit 26 and mesh filter 26a, and is drawn from here by the activity of fan 48 through first heat exchanger 38 and second heat exchanger 40. Filter sensor 27 may be assigned to filter unit 26 and / or compartment 25 and / or cover 24 to detect whether filter unit 26 is correctly inserted into the compartment and / or whether filter unit 26 has been (partially) removed.

[0098] An electric water heater 62 can be arranged in the tub 52 for heating the washing liquid. The drum 58 is driven by a drum motor 64, which preferably receives power from a drum motor inverter 66. The operation of the washer-dryer is controlled by a control unit 68, which includes a memory 70. Figure 6 The memory 70 stores different program parameters for different programs and different program options. The compressor 44 is powered by the compressor inverter 72, which is controlled by the control unit 68, such as... Figure 6 As shown.

[0099] The washer-dryer 2 may include a pressure sensor 74, which is adapted to provide a pressure signal corresponding to the pressure of the dry air within the tub 52 (e.g., during a drying cycle) or the pressure caused by the liquid stored in the tub 52 (e.g., during a washing cycle). Specifically, the pressure sensor 74 is adapted to provide a pressure signal corresponding to the air pressure of the dry air at a location arranged along the air circulation path. The pressure sensor 74 can be connected to the bottom of the tub 52 or a reservoir via a sensor connection line 76. The signal from the pressure sensor 74 can be provided to the control unit 68. However, the pressure sensor can be arranged anywhere along the air circulation path. For example, the pressure sensor can be arranged along the dry air passage 50. Alternatively, the pressure sensor can be arranged in the drum 58, such as, for example, in the lift mechanism of the drum 58.

[0100] Liquid stored in tank 52 can be discharged to the outside of cabinet 10 via discharge pump 80. The discharge activity of pump 80 can be controlled by control unit 68 based on water or liquid level detected by pressure sensor 74 (e.g., activated when a predetermined water level is exceeded) and / or in a specific program routine (e.g., for discharging washing liquid or for discharging water discharged during rotational circulation) and / or for discharging condensate that has been collected in the storage tank of tank 52.

[0101] The temperature of the dry air can be detected by a dry air temperature sensor 82, which is arranged, for example, at or near the air inlet 56 and sends a temperature signal to the control unit 68. Furthermore, a liquid supply arrangement 84 can be provided, connected to a household faucet, for supplying water to different detergent compartments within the detergent dispenser 90 under the control of the control unit 68. Additionally, the liquid supply arrangement 84 is adapted to supply water or liquid to a liquid connection line 94. Figure 5 In one example not shown, a bypass line is arranged to connect the liquid supply arrangement 84 directly to the liquid connection line 94 to bypass the detergent dispenser 90.

[0102] In an embodiment of the washer-dryer 2, a secondary air duct may be provided (see EP 2 843 100 A1

[0039] ). Figure 1 Reference numeral 130 in the attached diagram is used to draw some ambient air (AAIR) into the dry air channel 50. However, in this washer-dryer 2, the air drawn into the channel 50 cannot escape through the liquid connection line 94 because the siphon device 102 and the water level WL therein prevent air exchange through it (when the desired water level at WL is set). Note: As previously stated, Figure 3 The lint trap 102* shown corresponds to EP 2 843 100 A1. Figure 2 The protruding duct portion 260 shown in Figure c is replaced by the air trap siphon device 102 in this specification. In this embodiment of the washer-dryer 2, the air AAIR drawn in by this secondary air duct can be discharged via, for example, an intentionally leaking channel provided near the channel portion of the filter unit 26. For example, the exhaust channel is arranged at the filter compartment 25 and connects the interior of the channel 50 to the exterior of the cabinet 10. Preferably, the flow rate of the external air circulation (e.g., drawing in and expelling external air) is very low. More preferably, only a small channel is provided from the interior of the channel 50 toward the exterior of the cabinet 10 to achieve pressure balance between the air in the closed air loop and the external atmospheric pressure. This achieves a stable but low flow rate balance without the need to exhaust or draw in external air through the air trap in the siphon device 102.

[0103] As previously mentioned, the discharge pump 80 can be activated by the control unit 68 when the water (liquid) level at the storage tank of the bucket 52 is detected by the pressure sensor 74 and water needs to be discharged to the outside of the cabinet 10.

[0104] Figure 6 A simplified block diagram illustrates the components of the washer-dryer 2 controlled by the control unit 68, and the structure that provides control signals (parameters) to the control unit. Refer to the above. In short, the control unit 68 can control one or more of the following:

[0105] - Liquid supply arrangement 84 for selectively supplying water to the individual compartments of detergent dispenser 90 for rinsing treatment agents (e.g., detergent, softener) and / or for directly supplying water to liquid connection line 94.

[0106] - Display and / or acoustic signals of panel 18,

[0107] - Activate / deactivate fan motor 78,

[0108] - Activate / deactivate electric water heater 62,

[0109] - Activate / deactivate discharge pump 80,

[0110] - Control the roller motor inverter 66 or electronic components, and

[0111] - Control compressor inverter 72 or electronic devices.

[0112] The control unit can receive control or status signals (parameters) from one or more of the following:

[0113] - Panel 18 (Program Selector, Option Selector).

[0114] - Temperature sensor 82,

[0115] - Pressure sensor 74,

[0116] - Filter sensor 27,

[0117] - Drum motor inverter 66 or electronic components, and

[0118] - Compressor inverter 72 or electronic components.

[0119] In one implementation, the filter unit 26 may be replaced by a water-operated lint filter, or alternatively, such a water-operated lint filter may be provided to remove lint from the air transported in the channel section between the drum 58 and the first heat exchanger 38. Due to the water flow from this water-operated lint filter, water is collected in a reservoir in the tank 52, and the discharge pump 80 must repeatedly operate to remove the collected water from the lint filter and condensation. Again, in this case, the amount of water drawn from the reservoir by the discharge pump 80 may cause a temporary negative pressure within the tank 52, resulting in water overflowing from the siphon device 102 into the tank 52. The control unit 68 then detects the operation of the discharge pump 80 activated under its control, and this detection of such an event that may cause water to overflow from the siphon device 102 causes the control unit 68 to activate the liquid supply arrangement 84 to supply water to the siphon device 102. Preferably, if the discharge pump 80 is activated, a delay is introduced before water supply begins, or water supply begins when the discharge pump 80 is deactivated.

[0120] Of course, instead of monitoring and detecting the signal via activating the discharge pump 80, or in addition to monitoring and detecting the signal via activating the discharge pump 80, the pressure signal from the pressure sensor 74 can be monitored. By monitoring and evaluating this signal, it can be determined whether there is a situation or event requiring water to be filled into the siphon device 102. By monitoring or evaluating the combination of the signals from the discharge pump activation and the pressure sensor 74, the control unit 68 can, for example, determine that the discharge pump 80 is activated, and the pressure signal must be evaluated using specific evaluation parameters that facilitate the occurrence of water discharge. For example, the pressure threshold and / or the duration of pressure changes and / or the direction of pressure increase or decrease during training activities may be different compared to opening the filter compartment. Therefore, in the evaluation of pressure changes, it is necessary to distinguish whether they are caused by drainage or the opening of the fluff compartment to determine whether water (liquid) needs to be supplied via the liquid supply arrangement 84.

[0121] Below, an exemplary method is described for operating the washer-dryer 2 to dry clothes during a drying cycle based on a pressure signal provided by a pressure sensor (preferably not based on signals from any other sensors in the washer-dryer). For example, Figure 9 Combination Figure 7 A method for determining whether a filter is not in an operational position is shown, and Figure 11 Combination Figure 10 A method for determining whether liquid refilling is required is shown.

[0122] As mentioned above, filter sensor 27 can be assigned to filter unit 26 and / or compartment 25 and / or cover 24 to detect whether filter unit 26 is correctly inserted into compartment 25 and / or whether filter unit is (partially) removed. However, filter sensor 27 is only optional in washer-dryer. Alternatively (i.e., without filter sensor 27), it can be determined whether filter unit 26 is not in the operating position based on the presence of a pressure event in the pressure signal provided by pressure sensor 74, as described below. Figure 7 and 9 As explained, the reliability of determining whether the filter unit 26 is in the operating position is improved when filter sensor 27 is provided. In particular, if one of the two sensors 27 and 74 fails or is defective, the other sensor can determine whether the filter unit 26 is in the operating position.

[0123] Figure 9 A schematic flowchart is shown, illustrating a method for operating the garment processing equipment according to an embodiment, and in particular a method for determining whether the filter unit 26 is not in an operating position.

[0124] In step S2, which is an optional step of the method, the pressure signal provided by the pressure sensor during the (first) time period of the drying cycle can be evaluated to determine whether the pressure signal amplitude is below the pressure signal amplitude threshold THR_A (see...). Figure 7 ).

[0125] In step S4, liquid refill is provided with a volume of liquid sufficient to provide siphon function for the liquid connection line 94 (i.e., siphon device 102). Liquid refill can be provided when the pressure signal amplitude is determined to be below the pressure signal amplitude threshold THR_A during the first time period in step S2. Alternatively, liquid refill can be provided at the beginning of the drying cycle or between the washing and drying cycles to ensure that siphon function of the liquid connection line 94 (i.e., siphon device 102) is provided at the beginning of the drying cycle.

[0126] In S8, the presence of a pressure signal event is assessed based on the pressure signal during a time period of the drying cycle. A pressure signal event may exist if the pressure signal amplitude is below a pressure signal amplitude threshold and / or the pressure signal change is above a pressure signal change threshold during the time period.

[0127] If it is determined in step S8 that no pressure signal event occurs during the time period, then filter unit 26 is determined to be in the operating position (step S12). Furthermore, it is determined that the siphon device provides an air trap function, therefore no liquid refill is required. The method can then continue to further evaluate step S8 in subsequent time periods. As long as no pressure signal event occurs, the time periods can be performed one after another, such as... Figure 10 The time period T3 to T5 and Figure 7 The time period indicated by TP0 to TP2.

[0128] If a pressure signal event is determined in step S8 during the time period, step S10 is executed, whereby the elapsed time, indicating the time since the (last) liquid refill, is determined. The elapsed time can be defined as the time between the (last) liquid refill and the end of the (current) time period. Alternatively, the elapsed time can be defined as the time between the (last) liquid refill and the (current) time period. Furthermore, the elapsed time can be defined as the time between the (last) liquid refill and the start of the (current) time period.

[0129] In step S14, the elapsed time is compared with a refill time threshold. The refill time threshold may be less than 30 minutes, preferably in the range of 2 minutes to 30 minutes, more preferably in the range of 5 minutes to 30 minutes, and most preferably in the range of 5 minutes to 15 minutes.

[0130] If it is determined in step S14 that the elapsed time is above the refill time threshold, further liquid refill can be provided in step S16. After further liquid refill in step S16, the method can continue with further pressure signal evaluation step S8 in a subsequent time period. In one example, after liquid refill, the pressure signal evaluation is paused for a short time to allow the pressure signal to stabilize, and then the pressure signal evaluation continues during another time period. The pause can be about 10 seconds or longer, up to about 60 seconds.

[0131] If it is determined in step S14 that the elapsed time is below the refill time threshold, then it can be determined that filter unit 26 is not in the operating position (step S18).

[0132] If it is determined in step S14 that the elapsed time is below the refill time threshold, then S20 will perform one or more actions, including one or more of the following: the drying cycle may be paused or stopped, and / or the user may be provided with information that the filter unit is not correctly positioned in the air circulation arrangement. For example, the user may be notified via a symbol or icon on the washer-dryer's display or via an acoustic signal from the washer-dryer. By stopping or pausing the drying cycle, lint can be prevented from reaching the washer-dryer's heat pump or condenser unit. Furthermore, if the filter unit 26 is not in the operating position, the pressure loss of the dry air may reduce the drying efficiency of the drying cycle. Therefore, by stopping or pausing the drying cycle, the drying cycle can be prevented from continuing with reduced efficiency due to the filter unit 26 not being correctly positioned. Additionally, the control unit 68 may pause the evaluation of the pressure signal.

[0133] When the filter unit 26 is correctly positioned in the operating position, the drying cycle can be resumed / continued by the user's action. For example, the user can input a restart signal at the user control panel of the washer-dryer after placing the filter unit 26 in the operating position. Then, the method can continue to perform another pressure signal assessment during another time period S8. Preferably, the pressure signal assessment step S8 is repeatedly, periodically, or permanently performed during the drying cycle during a subsequent time period.

[0134] Figure 7An example pressure signal PS1 provided by pressure sensor 74 (as previously stated, the pressure sensor can be arranged anywhere along the air circulation path) is shown as a function of time during a drying cycle. A first time segment F1 of the pressure signal (where the pressure signal amplitude of pressure signal PS1 is above the pressure signal amplitude threshold THR_A) indicates that filter unit 26 is in the operating position. A second time segment F2 of the pressure signal (where the pressure signal amplitude of pressure signal PS1 is below the pressure signal amplitude threshold THR_A) can indicate that filter unit 26 is not (properly arranged) in the operating position. Preferably, the pressure signal amplitude threshold THR_A is selected such that the pressure signal exceeds the pressure signal amplitude threshold THR_A only when filter unit 26 is in the operating position and there is a corresponding liquid level in siphon device 102 sufficient to provide air trap function (i.e., siphon device 102 is full of liquid). Furthermore, the pressure signal amplitude threshold THR_A is preferably selected such that when filter unit 26 is not (properly arranged) in the operating position, the pressure signal remains below the threshold THR_A, regardless of the liquid level in siphon device 102.

[0135] When filter unit 26 is removed from the air circulation arrangement (e.g., filter unit 26 configured as a drawer can be opened, i.e., filter unit 26 can be partially or completely removed from filter compartment 25), the pressure signal amplitude of pressure signal PS1 decreases (see...). Figure 7 The voltage drop (PD) in the middle. Specifically, such as Figure 7 As shown, the pressure signal amplitude decreases from a pressure value higher than the pressure signal amplitude threshold THR_A to a pressure value lower than the pressure signal amplitude threshold THR_A.

[0136] also, Figure 7 An example of a control unit 68 is shown, which is configured to control the drying cycle for clothes received in the drying drum 58. Figure 7An example of the pressure signal PS1 over several subsequent time periods TP0 to TP4 is shown. When time periods TP0, TP1, and TP2 occur during the first time segment F1 of the pressure signal PS1, the pressure signal amplitude is above the pressure signal amplitude threshold THR_A. Therefore, during each of the time periods TP0, TP1, and TP2, the pressure signal amplitude is above the pressure signal amplitude threshold THR_A. Furthermore, the pressure signal PS1 is fairly stable during the first time segment F1, indicating that pressure signal changes can be below the pressure signal change threshold. In this case, the evaluation of pressure signal changes is optional. Therefore, during each of the time periods TP0, TP1, and TP2, the evaluation of the pressure signal received from the pressure sensor during each corresponding time period TP0, TP1, and TP2 results in no pressure signal event. Therefore, after each of the time periods TP0, TP1, and TP2, a subsequent time period begins without taking any action, such as providing liquid refill or determining that the filter unit 26 is not (properly arranged) in the operating position.

[0137] In addition, regarding Figure 7 Time periods TP3 and TP4 occur during the second time segment F2 of the pressure signal, during which the pressure signal amplitude is below the pressure signal amplitude threshold THR_A. During time period TP3, pressure signal PS1 is evaluated to determine if a pressure signal event exists. Since the pressure signal amplitude of pressure signal PS1 is below the pressure signal amplitude threshold THR_A during time period TP3, a pressure signal event is determined to exist by control unit 68. In the next step, the time elapsed since liquid refill is determined. (As in...) Figure 7 As can be seen, no liquid refill occurred during the time period TP0 to TP3. In this example, the refill time threshold THR_R is shorter than the total duration of the time period TP0 to TP3. More precisely, in this example, the refill time threshold THR_R is longer than one time period but shorter than two time periods. Therefore, the time elapsed since the last liquid refill is determined to be higher than the refill time threshold THR_R. Therefore, the control unit 68 is configured to provide (further) liquid refill. One reason for providing liquid refill is that a pressure signal event may be caused by an insufficient liquid level in the siphon device 102, causing air and / or lint to be delivered through the siphon device 102 due to the absence of the siphon device function (i.e., air trap function) of the siphon device 102, as, for example, water may have evaporated due to the long time elapsed since the previous liquid refill.

[0138] from Figure 7As can be seen, the liquid refill performed after time period T3 does not affect the pressure signal amplitude of pressure signal PS1, which remains below the pressure signal amplitude threshold THR_A. Therefore, after liquid refill, during time period TP4, the pressure signal amplitude of pressure signal PS1 is determined to be (still) below the pressure signal amplitude threshold THR_A. Therefore, control unit 68 determines that the pressure signal event (still) exists. However, in this case, the time elapsed since liquid refill is determined to be below the refill time threshold THR_R. Therefore, control unit 68 is configured to determine that filter unit 26 is not (properly arranged) in the operating position.

[0139] As a result of determining that filter unit 26 is not (properly arranged) in the operating position, several actions can be performed. Control unit 68 can be configured to pause or stop the drying cycle. Furthermore, control unit 68 can provide the user with information that filter unit 26 is not properly arranged in the operating position. Additionally, control unit 68 can pause the evaluation of the pressure signal.

[0140] Each time interval TP0 to TP4 can range from 1 second to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 300 seconds, even more preferably 10 seconds to 180 seconds, and most preferably 20 seconds to 100 seconds. In one example, each time interval during the drying cycle has the same length. However, in another example, the time intervals during the drying cycle can have different lengths.

[0141] exist Figure 7 In the example, the refill time threshold THR_R is longer than one time period but shorter than two time periods. However, the refill time threshold THR_R can be shorter or longer than two time periods. The refill time threshold THR_R can correspond to several time periods. The refill time threshold can be less than 30 minutes, preferably 30 seconds to 20 minutes, more preferably 2 minutes to 15 minutes, and most preferably 3 minutes to 10 minutes.

[0142] Figure 11 A schematic flowchart according to another embodiment is shown, illustrating a method for operating a garment handling device during a drying cycle, and specifically for providing liquid refill based on determining whether the siphon device 102 is in a so-called “bubbling / gurgling” state (indicated by a high change in the pressure signal).

[0143] In S24, the pressure signal change provided by the pressure sensor 74 during the (first) time period can be determined.

[0144] In S26, it can be determined whether the pressure signal change during the (first) time period is above the pressure signal change threshold THR_V. If the pressure signal change during that time period is below the pressure signal change threshold THR_V, the method can return to the previous step S24 to evaluate the pressure signal change during subsequent time periods. If the pressure signal change during that time period is above the pressure signal change threshold THR_V, the method can continue to S32, in which liquid refill corresponding to the amount of liquid sufficient to provide the air trap function of the liquid connection line 94 (i.e., the full siphon device 102) is supplied from the liquid supply arrangement 84 to the liquid connection line 94 (and therefore also to the siphon device 102). Then, the method can return to step S24 to evaluate the pressure signal change during subsequent time periods. When the pressure signal change during that time period is above the pressure signal change threshold THR_V, the siphon device is considered to be in a so-called "bubbling / gurgling" state. Bubbling / gurgling state (see...) Figure 10 St2) can be a state in which the liquid level in the siphon device 102 (of the liquid connection line 94) is between "full" and "empty". In the "full" state, the siphon device 102 is full (i.e., at least the minimum liquid level in the liquid connection line 94, such that the siphon device function / air trap function is provided, and air and / or lint cannot pass through the siphon device, see [reference]). Figure 10 (St3), in the "empty state" (see St3) Figure 10 In step S1), the siphon device 102 is not full (i.e., the liquid level is below the level that provides the siphon device function / air trap function). This bubbling / gurgling state can cause undesirable noise and may partially allow air exchange between the detergent dispenser 90 and the tank 52. By providing liquid refill in step S32, the siphon device 102 switches from the bubbling / gurgling state to the full state where the siphon device provides the siphon device function. Therefore, air / lint exchange and / or bubbling / gurgling noise can be eliminated.

[0145] Alternatively, when optional steps S28 and S30 are included, and when it is determined in step 26 that the pressure signal change during the first time period is above the pressure signal change threshold THR_V, in step S28, the pressure signal change of the pressure signal provided by the pressure sensor 74 during the (second) subsequent time period (the time period after the first time period) can be determined.

[0146] In step S30, it can be determined whether the pressure signal change during the (second) subsequent time period is above the pressure signal change threshold THR_V. If the pressure signal change during the subsequent time period is below the pressure signal change threshold THR_V, the method can return to the previous step S24. If the pressure signal change during the second time period is above the pressure signal change threshold THR_V, the method can continue to S32 as described above. That is, preferably, liquid refilling in step S32 is only provided if the pressure signal change is above the pressure signal change threshold THR_V in two consecutive time periods (the first time period and the second time period). Therefore, the probability of misclassification due to factors such as pressure sensor failure or decreased air fan speed can be reduced. Therefore, potentially unnecessary liquid refilling can be avoided.

[0147] Figure 10 The diagram illustrates the relationship between an example pressure signal PS5 provided by pressure sensor 74 and time during a drying cycle in which filter unit 26 is in the operating position. During a first time interval St1, the pressure signal amplitude is below the pressure signal amplitude threshold THR_A, which indicates the liquid level in liquid connection line 94, and particularly the liquid level in siphon device 102, is below the level providing the air trap function. During a third time interval St3, the pressure signal amplitude is above the pressure signal amplitude threshold THR_A, which indicates the liquid level in liquid connection line 94, and particularly the liquid level in siphon device 102, is above the level providing the air trap function, i.e., siphon device 102 is in a full state where it provides the siphon device function, i.e., siphon device 102 is filled with liquid.

[0148] During the second time interval St2, between the first time interval St1 and the third time interval St3, the pressure signal change V of pressure signal P5 is above the pressure signal change threshold THR_V. This indicates that the siphon device 102 is in a so-called "bubbling / gurgling" state, in which partial air exchange between the drum 58 and the detergent dispenser 90 is possible because the liquid level in the siphon device 102 is close to the threshold required to provide the siphon effect. That is, some air sometimes leaks sporadically through the siphon device, thus causing bubbling / gurgling in the siphon device 102. During the second time interval St2, the pressure signal amplitude can be above the pressure signal amplitude threshold THR_A, such as... Figure 10 As shown.

[0149] also, Figure 10 An example of a control unit 68 is shown, which is configured to control the drying cycle for clothes received in the drying drum 58. Figure 10An example of the pressure signal PS5 over multiple subsequent time periods T1 to T5 is shown. In this example, for simplicity, it is assumed that the refill time threshold is not considered; that is, it can be assumed that filter unit 26 is in the operating position. During the first time period T1, the pressure signal amplitude of pressure signal PS5 is determined to be below the pressure signal amplitude threshold THR_A. Therefore, liquid refill is provided from the liquid supply arrangement 84 to the liquid connection line 94. During the (subsequent) second time period T2, the pressure signal change V of pressure signal PS5 is determined to be above the pressure signal change threshold THR_V. Therefore, further liquid refill is provided from the liquid supply arrangement 84 to the liquid connection line 94.

[0150] according to Figure 10 An alternative example is provided, where the time period is half the length of T2 in the previous example, as shown by time periods T2A and T2B. Furthermore, in this alternative example, steps S28 and S30 are applied, meaning the control unit is configured to provide fluid refill only if the pressure signal change (V) is above the pressure signal change threshold (THR_V) during two consecutive time periods. In this alternative example, the pressure signal change (V) is above the pressure signal change threshold (THR_V) during the two consecutive time periods T2A and T2B. Therefore, fluid refill is provided.

[0151] During the (subsequent) third time period T3, it is determined that the pressure signal amplitude of pressure signal PS5 is above the pressure signal amplitude threshold THR_A and the pressure signal change of pressure signal PS5 is below the pressure signal change threshold THR_V. Therefore, it is determined that no further liquid refill is needed (no pressure signal event). Furthermore, during each of the fourth time period T4 and the fifth time period T5, it is determined that the pressure signal amplitude of pressure signal PS5 is above the pressure signal amplitude threshold THR_A and the pressure signal change of pressure signal PS5 is below the pressure signal change threshold THR_V. Therefore, it is determined that no further liquid refill is needed after the fourth time period T4 or after the fifth time period T5, because it is determined that the siphon device 102 is filled with liquid to provide the air trap function of the siphon device 102 to prevent air from passing through the siphon device 102.

[0152] It should be understood that, Figure 9 and Figure 11 Shown and about Figure 9 and Figure 11 The described concepts can be implemented in the same algorithm executed by the control unit 68.

[0153] Preferably, the air fan speed of the dry air fan 48 operates at a constant or substantially constant speed during each time period. Preferably, the exhaust pump 80 is activated or deactivated during the time period. In particular, changes in the air fan speed of the dry air fan 48 and / or the operation of the exhaust pump 80 (such as starting or stopping the exhaust pump 80) may cause changes in the pressure signal of the dry air (especially the pressure signal amplitude and / or pressure signal variation), and will therefore distort the results of the pressure signal evaluation during that time period.

[0154] also, Figure 8 This is a graph showing the relationship between three different pressure signals PS2, PS3, and PS4 provided by pressure sensor 74 and time during different air fan speeds for the drying air fan 48 in the drying cycle. (As can be seen from...) Figure 8 The derived pressure signal (particularly the pressure signal amplitude and / or variation) provided by pressure sensor 74 depends on the air fan speed applied during the drying cycle. Pressure signal PS2 corresponds to the pressure signal when a first fan speed FS1 is applied during the drying cycle. Pressure signal PS3 corresponds to the pressure signal when a second fan speed FS2 is applied during the drying cycle. Pressure signal PS3 also corresponds to the pressure signal when a third fan speed FS3 is applied during the drying cycle. The third fan speed FS3 is higher than the second fan speed FS2, and the second fan speed FS2 is higher than the first fan speed FS1. That is, as the air fan speed of the drying air fan 48 increases, the pressure signal provided by pressure sensor 74, particularly the pressure signal amplitude and / or variation, increases.

[0155] This means that the pressure signal amplitude threshold THR_A is also related to the applied air fan speed. More specifically, if the fan speed increases, the pressure signal amplitude threshold THR_A increases. Conversely, if the fan speed decreases, the pressure signal amplitude threshold THR_A decreases.

[0156] Furthermore, the pressure signal variation threshold THR_V can be adapted in relation to the applied air fan speed. More specifically, if the fan speed increases, the pressure signal variation threshold THR_V increases. Conversely, if the air fan speed decreases, the pressure signal variation threshold THR_V decreases.

[0157] In one example, the fan speed may vary during the drying cycle. In this case, it is important that the fan speed remains constant or substantially constant during the subsequent time period. If the air fan speed varies drastically during the time period, the evaluation of the pressure signal performed during that time period can be disregarded.

[0158] Therefore, the aforementioned thresholds, such as the pressure signal amplitude threshold THR_A and / or the pressure signal change threshold THR_V, are preferably adapted to the air fan speed of the dry air fan 48 applied during a specific time period. Specifically, when a higher fan speed is applied during the time period for evaluating the pressure signal (compared to a previously applied air fan speed), the pressure signal amplitude threshold THR_A and / or the pressure signal change threshold THR_V can be increased. When a lower fan speed is applied during the time period for evaluating the pressure signal (compared to a previously applied air fan speed), the pressure signal amplitude threshold THR_A and / or the pressure signal change threshold THR_V can be decreased.

[0159] List of reference numerals

[0160] 2. Clothing processing machines (such as washer-dryer)

[0161] 4 Loading opening

[0162] 6 doors

[0163] 8 handles

[0164] 10. Cabinets / Enclosures

[0165] 12 Anterior wall

[0166] 14 Sidewalls

[0167] 16 Top Cover

[0168] 18. Display and Input Panel

[0169] 20 Program Selector

[0170] 22 Option Selector

[0171] 24 Filter compartment cover

[0172] 25 Filter compartments

[0173] 26 Filter Units / Fluff Filters

[0174] 26a Mesh Filter

[0175] 27 Filter Sensor

[0176] 28 Detergent drawer

[0177] 30 Top Units

[0178] 32 Heat Pump System

[0179] 34 Top shell / lid

[0180] 36 Lower shell / tray

[0181] 38 First heat exchanger (evaporator)

[0182] 40 Second heat exchanger (condenser)

[0183] 42 Refrigerant Circuit

[0184] 44 Compressor

[0185] 46. ​​Expansion device

[0186] 48 Dry air fan / blower

[0187] 50 Dry Air Channel

[0188] 52 barrels

[0189] 54 Air outlet

[0190] 56 Air Inlet

[0191] 58-roller (clothing compartment)

[0192] 60 Clothing

[0193] 62 Electric water heater

[0194] 64 Roller Motor

[0195] 66 Roller Motor Inverter

[0196] 68 Control Unit

[0197] 70 Memory

[0198] 72 Compressor Inverter

[0199] 74 Pressure Sensor

[0200] 76 Sensor connection cable

[0201] 78 Fan Motor

[0202] 80 Discharge Pump

[0203] 82 Dry Air Temperature Sensor

[0204] 84 Liquid Supply Arrangement

[0205] 90 Detergent dispenser

[0206] 92 Distributor compartment

[0207] 94, 94* Liquid connection lines

[0208] 96. Inlet from the distributor

[0209] 98 to the barrel outlet

[0210] 100 Corrugated Pipe

[0211] 102* Lint Collector

[0212] 102 Siphon Device

[0213] PS1-PS5 pressure signals

[0214] A dry airflow

[0215] FS1-FS3 Fan Speed

[0216] WL water level

[0217] TP0-TP4 time period

[0218] T1-T5 time period

[0219] THR_Rrefill refill time threshold

[0220] V Pressure signal change

[0221] THR_A pressure signal amplitude threshold

[0222] THR_V pressure signal change threshold

[0223] St1 First time interval

[0224] St2 Second Time Interval

[0225] St3 Third Interval

[0226] F1 First Time Period

[0227] F2 Second Time Period

[0228] Pressure drop of PD pressure signal

Claims

1. A garment handling machine, particularly a washer-dryer (2), comprising: Bucket (52), A drum (58) is arranged inside the tub (52) and adapted to receive clothing for drying with dry air. An air circulation arrangement is provided, the air circulation arrangement including the roller (58), the barrel (52) and the dry air passage (50), the dry air passage (50) being adapted to guide the dry air from at least one air outlet (54) at the roller (58) or the barrel (52) to at least one air inlet (56) at the roller (58) or the barrel (52). A dry air fan (48) is provided, the dry air fan (48) being adapted to deliver the dry air through the air circulation arrangement. A filter unit (26) is configured to be arranged in the air circulation arrangement to filter the dry air supplied by the dry air fan (48). A detergent dispenser (90), said detergent dispenser (90) being adapted to store at least one treatment agent for garment treatment, A liquid connection line (94) connects at least one outlet of the detergent dispenser (90) to the interior of the tub (52) or drum (58), wherein the liquid connection line (94) includes a siphon device (102) that, when filled with liquid, provides an air trap function to prevent air from passing through the siphon device (102). A liquid supply arrangement (84) adapted to supply liquid to the liquid connection line (94), Pressure sensor (74), the pressure sensor (74) being adapted to provide a pressure signal corresponding to the air pressure of the dry air at a location arranged along the air circulation route, and A control unit (68) is configured to control the drying cycle for drying clothes received in the drum (58) by: Liquid refill is supplied from the liquid supply arrangement (84) to the liquid connection line (94), the liquid refill corresponding to a liquid amount sufficient to provide the air trap function of the siphon device (102). The presence of a pressure signal event is assessed based on the pressure signal received from the pressure sensor (74) during the time period. Determine the time elapsed since the liquid was refilled. The time elapsed since the liquid was refilled is compared to a refill time threshold (THR_R), and If the pressure signal event exists and the elapsed time is below the refill time threshold (THR_R), the control unit (68) is further configured to perform one or more actions, including: Pause or stop the drying cycle. Provide information on the operating position where the filter unit (26) is not correctly arranged in the air circulation arrangement, and / or The evaluation of the pressure signal is paused.

2. The garment processing machine according to claim 1, wherein, If the pressure signal event exists and the elapsed time is below the refill time threshold, then the filter unit (26) is determined not to be in an operating position before performing the one or more actions.

3. The garment processing machine according to claim 1 or claim 2, wherein, The pressure signal event is considered to exist if the following occurs during the stated time period: The pressure signal amplitude is below the pressure signal amplitude threshold (THR_A); and / or The pressure signal change (V) of the pressure signal is above the pressure signal change threshold (THR_V).

4. The garment processing machine according to any one of the preceding claims, wherein, The refill time threshold (THR_R) is less than 30 minutes, preferably in the range of 30 seconds to 20 minutes, more preferably in the range of 2 minutes to 15 minutes, and most preferably in the range of 3 minutes to 10 minutes.

5. The garment handling machine according to any one of the preceding claims, wherein the control unit (68) is further configured to control the drying cycle for drying garments received in the drum (58) by: If the pressure signal event exists and the elapsed time is above the refill time threshold (THR_R), then liquid refill or further liquid refill is provided from the liquid supply arrangement (84) to the liquid connection line (94), the liquid refill or further liquid refill corresponding to a liquid amount sufficient to provide the air replenishment function of the siphon device (102).

6. The garment handling machine according to any one of the preceding claims when dependent on claim 3, wherein, Determining the pressure signal change of the pressure signal includes: Determine the deviation between the pressure signal amplitude value during the time period and the average pressure signal amplitude value during the time period. Determine the root mean square (RMS) or mean square error (MSE) of the pressure signal amplitude value that deviates from the average pressure signal amplitude during the said time period; or Determine the difference between the maximum and minimum values ​​of the pressure signal amplitude during the time period.

7. The garment processing machine according to any one of the preceding claims, wherein, The pressure sensor (74) is fluidly connected to the bottom of the tub (52) or the reservoir, wherein the pressure sensor (74) is also adapted to provide a pressure signal corresponding to the pressure caused by the liquid in the tub (52) during a washing cycle for washing clothes received in the drum (58).

8. The garment processing machine according to any one of the preceding claims, wherein, During the time period, preferably throughout the entire time period, the dry air fan (48) operates at a constant or substantially constant air fan speed.

9. The garment processing machine according to any one of the preceding claims, wherein, The discharge pump (80) of the garment processing machine, configured to discharge liquid from the bucket (52), is activated or deactivated during the time period, preferably throughout the entire time period.

10. A method for operating a garment handling machine, particularly a washer-dryer (2), during a drying cycle for drying clothes. The garment processing machine includes: Bucket (52), A drum (58) is arranged inside the tub (52) and adapted to receive clothing for drying with dry air. An air circulation arrangement is provided, the air circulation arrangement including the roller (58), the barrel (52) and the dry air passage (50), the dry air passage (50) being adapted to guide the dry air from at least one air outlet (54) at the roller (58) or the barrel (52) to at least one air inlet (56) at the roller (58) or the barrel (52). A dry air fan (48) is provided, the dry air fan (48) being adapted to deliver the dry air through the air circulation arrangement. A filter unit (26) is configured to be arranged in the air circulation arrangement to filter the dry air supplied by the dry air fan (48). A detergent dispenser (90), said detergent dispenser (90) being adapted to store at least one treatment agent for garment treatment, A liquid connection line (94) connects at least one outlet of the detergent dispenser (90) to the interior of the tub (52) or drum (58), wherein the liquid connection line (94) includes a siphon device (102) that, when filled with liquid, provides an air trap function to prevent air from passing through the siphon device (102). A liquid supply arrangement (84) adapted to supply liquid to the liquid connection line (94), and Pressure sensor (74), the pressure sensor (74) being adapted to provide a pressure signal corresponding to the air pressure of the dry air at a location arranged along the air circulation; The method includes: Liquid refill is supplied from the liquid supply arrangement (84) to the liquid connection line (94), the liquid refill corresponding to a liquid amount sufficient to provide the air trap function of the siphon device (102). The presence of a pressure signal event is assessed based on the pressure signal received from the pressure sensor (74) during the time period. Determine the time elapsed since the liquid was refilled. The time elapsed since the liquid was refilled is compared to a refill time threshold (THR_R), and If the pressure signal event exists and the elapsed time is below the refill time threshold (THR_R), then one or more actions are performed, including: Pause or stop the drying cycle. Provide information on the operating position where the filter unit (26) is not correctly arranged in the air circulation arrangement, and / or The evaluation of the pressure signal is paused.

11. The method according to claim 10, wherein, If the pressure signal event exists and the elapsed time is below the refill time threshold, then the filter unit (26) is determined not to be in an operating position before performing the one or more actions.

12. The method according to claim 10 or claim 11, wherein, The pressure signal event is considered to exist when the following occurs during the stated time period: The pressure signal amplitude is below the pressure signal amplitude threshold (THR_A); and / or The pressure signal change (V) of the pressure signal is above the pressure signal change threshold (THR_V).

13. The method according to any one of claims 10 to 12, wherein, The refill time threshold (THR_R) is less than 30 minutes, preferably in the range of 30 seconds to 20 minutes, more preferably in the range of 2 minutes to 15 minutes, and most preferably in the range of 3 minutes to 10 minutes.

14. The method according to any one of claims 10 to 13, further comprising: If the pressure signal event exists and the elapsed time is above the refill time threshold (THR_R), then liquid refill or further liquid refill is provided from the liquid supply arrangement (84) to the liquid connection line (94), the liquid refill or further liquid refill corresponding to a liquid amount sufficient to provide the air replenishment function of the siphon device (102).

15. The method according to any one of claims 10 to 14 when subordinate to claim 12, wherein, Determining the pressure signal change of the pressure signal includes: Determine the deviation between the pressure signal amplitude value during the time period and the average pressure signal amplitude value during the time period. Determine the root mean square (RMS) or mean square error (MSE) of the pressure signal amplitude value that deviates from the average pressure signal amplitude during the said time period; or Determine the difference between the maximum and minimum values ​​of the pressure signal amplitude during the time period.

Images