ES2342439T3 - WASHING MACHINE, IN PARTICULAR WASHING MACHINE OF COLADA, WITH A SIMPLIFIED USER INTERFACE. - Google Patents

Abstract

A washing machine comprises a wash tub (3), charging means (7, 8) for delivering a liquid into the tub (3), draining means (10, 12) for evacuating the liquid from the tub (3), a device for dispensing washing agents (6), and a control system (13, 14, 17). The control system (13, 14, 17) comprises at least: - a control unit (14), configured for managing a plurality of treatment cycles that can be carried out by the machine (1); - memory means (16), in which management programs of the treatment cycles are stored; - programming means (13), for making a manual selection among a plurality of possible selections (13b-13e), there being associated to each selection that can be made via the programming means (13) at least one respective management program; - means (17) for detecting a characteristic of the liquid charged into the tub (3). The control system (13, 14, 17) is designed in such a way that associated to a selection (13b) that can be made via the programming means (13) are two different management programs, corresponding to two different treatment cycles, and the control unit (14) is configured for carrying out one or other of the aforesaid management programs according to a value of said characteristic, obtained via the detection means (17) following upon a first charging of liquid into the tub (3).

Description

Washing machine, in particular washing machine casting, with a simplified user interface.

Field of the Invention

The present invention relates to a machine domestic washing machine, in particular a washing machine washing machine, according to the preamble of claim 1.

Prior art

In document no. EP-B-0 666 358, a machine of the referred type.

In this solution, the machine is equipped with detection means which, in the initial phase of a cycle of previously started washing, detect the possible presence of detergent in the liquid loaded in the tank. In said initial phase of the cycle, the clean water taken from the water supply network is impersonates a specific compartment of the distributor of washing agents and, in particular, the compartment designed for contain a prewash detergent. The control unit of the machine, according to the result of the measurement made by means of detection means, modifies the performance of the wash cycle in course. In practice, if in the water taken during the initial phase mentioned above, the presence of the detergent is not detected, the machine control unit does not prewash and passes immediately after the execution of a washing phase in the direction strict; instead, if the presence of detergent is detected in the water taken, the control unit issues a command to perform the complete cycle; that is, the cycle comprising the prewash. He document in question describes other possible applications of system to detect the possible presence of detergent in the water, in order to limit the negative consequences that can be derive from errors made by the machine user in relationship with the use of washing agents.

A washing machine according to the preamble of the claim 1 is also disclosed in document no. EP-B-0 748 892. In this case, the machine control system is predisposed in such a way that, in the final part of the treatment cycle, the rinse of the wash will be carried out until a rinse result is achieved default, as detected based on the measurements of ion concentration of the water used, obtained by detection means. To practice, then, when the value of the ion concentration detected, which represents the presence of detergent in water, descend below a certain limit The rinse ends. The solution described in the previous document provides the possibility for the user to define the limit value mentioned above according to your needs.

In document KR20050000094-A, a washing machine is disclosed, in which the results of washing and rinsing are improved according to the hardness of the water. In the machine washing machine, a procedure is carried out to decide if carried out or not a final rinse step during a cycle of wash defined above; the procedure includes the water supply to a defined water level, remove water for a predetermined period after completing the supply of water and calculate the hardness of the water by detecting the temperature and the conductivity of this.

It is known that, in appliances for most frequently used washing, programming media manual comprise a plurality of keys or buttons or a selector swivel with a number of alternative positions or a viewfinder of type of touch screen.

Regardless of the type, the means of programming provided must be designed for the user can make the appropriate selection among a plurality of possible selections, associated with each of which is the execution of a certain treatment cycle. Suppose, for for example, the case of a washing machine of the type indicated and designed to perform five cycles of wash treatment different. The so-called "user interface" of the machine, whereby the user can select the cycle of desired treatment among the five possible, must be equipped with at least five keys / buttons or a selector with at least five positions or a screen that is large enough to clearly highlight the symbols that represent the five treatment cycles that can be selected. Dimensions general and complexity of the construction and use of the interface of user are, at least to some extent, proportional to the number of selections allowed.

It should also be remembered that the machines washing machines have been proposed with an electronic control system provided to automatically select the treatment cycle at that will undergo washing. In this case, the machine provides only control means, which correspond to a button for start the wash cycle and the user does not have to perform No selection However, not all users are prepared to accept this system, according to which the Washing appliance "dominates" the user.

Summary of the invention

Thus, the present invention has been developed with the objective of simplifying the activity of selection of the treatment cycle that a user must perform in the case of machines equipped with programming means manual. From another point of view, the invention has been developed with the aim of simplifying the construction, appearance and general dimensions of manual programming means; is say, the user interface.

These purposes are achieved according to the present invention with an appliance, particularly a machine laundry washer, provided with the characteristics specified in attached claim 1. The preferred characteristics of the machine object of the invention are specified in the subordinate claims. The claims form a part of the technical education provided herein in relationship with the invention.

Brief description of the drawings

Other purposes, features and advantages of the present invention will be clearly apparent from of the description, made referring to the drawings attachments, which are provided by way of example only limiting and in which:

- Figure 1 is a schematic representation of a washing appliance according to the present invention;

- Figure 2 is a simplified diagram of a measurement design for the machine of figure 1.

Detailed description of the preferred embodiments of the invention

Shown schematically in Figure 1, it provides a washing appliance according to the invention designated entirely with reference 1. In the case exemplified, appliance 1 is a washing machine of laundry comprising a cabinet 2 in which a tank 3 of a known way Swivel mounted in tank 3, it find a drum 4 for washing, whose rotation can be driven by an electric motor 5. The user can access the drum 4 by means of an opening, made in the cabinet 2, which closes, during the operation of machine 1, with a door.

Designated in full with reference 6, a washing agent distributor is provided, which in the This report assumes that it is of the type provided with a drawer which defines three single dose compartments to contain the respective washing agents, and in particular a compartment 6a for a prewash detergent, a compartment 6b for a washing detergent and a 6c compartment for a softening agent or a bleaching agent. The drawer mentioned above is slides in a hopper container, provided with a lower outlet that is connected, via a conduit 7, to the tank 3. Alternatively, the washing agent distributor can be housed at the door of machine 1 and can comprise one or more compartments; preferably three compartments.

Designated with reference 8, valve means are provided, provided with an inlet designed for connection to a domestic system for the supply 9 of clean water. The distributor 6 and the valve means 8 are provided so that a flow of water from the water supply system 9 passes, selectively and controlled, through one of the compartments 6a, 6b or 6c, according to the operational phase of the machine 1. The water, after crossing the corresponding compartment, leaves the above-mentioned hopper container, carrying with it the possible washing agent and, subsequently, reaches the tank 3 through the duct 7. According to the widely known techniques of the field, the valve means 8 may comprise a single solenoid valve and the distributor 6 may be equipped with a movable nozzle, which can be controlled to direct the flow allowed by the solenoid valve selectively to one of the compartments 6a-6c; In another possible embodiment of a known type, the valve means may comprise a system of a number of solenoid valves in parallel.
read it

Designated with reference 10, is provided a drain conduit, provided with a first end connected to an opening present in the lower zone of the tank 3 and a second end intended to connect to a debug system 11. Provided along the tube 10, a drain pump is provided 12.

Designated in full with reference 13, manual programming means of machine 1 are provided; that is, its user interface. In the case exemplified, said interface comprises five keys; in particular, a key to turn on and off, designated with reference 13a, and four keys 13b to 13e for the selection of treatment cycles that can make the machine 1.

Designated in its entirety with reference 14, a control unit of the machine 1 is provided, comprising a microcontroller 15. Microcontroller 15 in turn comprises or is operatively connected to non-volatile memory media designated with reference 16; for example, it comprises one or more ROM and / or EPROM and / or EEPROM and / or Flash memories.

Designated in full with reference 17, detection means are provided, which are adapted to directly or indirectly detect one or more physical characteristics or chemical water present in tank 3 during operation of the machine In a possible embodiment, the means of detection 17 comprise a circuit design designed to measure the degree of resistivity, or conductivity, of water, and thus obtain indirectly from the degree of resistivity or conductivity measured, the alkalinity or ion concentration value of the water, said value representing the concentration of detergent. The alkalinity or ion concentration of water can also be measured directly, just as other characteristics can be measured chemical and physical that may be affected by the presence of washing agents in water, such as hardness or turbidity

In the preferred embodiment of the present invention, the circuit design mentioned above It is the same type as described in the documents mentioned formerly EP-A-0 666 358 and EP-A-0 748 892, and also in the EP-B-582 326, whose Teachings are incorporated herein by reference. In summary, as can be seen from figure 2, the design mentioned above comprises two electrodes, designated with references A and B, consisting of conductive elements electrically, which are adapted to come into contact with the water loaded in the tank; electrode B being isolated from electrode A. In the exemplified case, electrodes A and B are positioned in the vicinity of the lower opening of the tank 3; that is, in the vicinity of the inlet 3a of the drain pipe 10.

When connecting electrode A to the positive pole of a generator E of an AC voltage (for example, E = 5 V or E = 3.3 V) and set electrode B to ground (negative pole thereof voltage generator E) by means of a capacitor C of the capacity suitable (for example, C = 1 µF), a flow of current from A to B that is proportional to the water resistivity of washed. Said current flow passes to supply the current transient capacitor charge C and stops when said transient current ceases; that is, when a voltage equal to E value is present in capacitor C. The duration of the load transient current depends on the value of the capacity of the capacitor C and the value of the resistivity of the media (water) through which the charging current flows. Once established adequate capacitor capacity C (for example, C = 1 µF), information on water resistivity can be obtained through measuring the charge time duration of said capacitor C. The measurement of the duration of the charging time is performed via microcontroller 15 of control unit 14, equipped with an internal clock that can measure time with a good resolution (for example, with a resolution of 1 \ mus). A digital input of microcontroller 15, designated by reference INP in Figure 2, is connected to the ends of capacitor C, while one of its digital outputs, designated with the OUT reference, used to drive a transistor Q, used as an on / off switch, whose collector is, in turn, connected to the ends of the capacitor C. The measurement of the charging time of the capacitor C is done by following operations of microcontroller 15:

-

fast discharge of capacitor C, obtained by applying a short pulse (for example, of the duration of 1 ms) to the base of transistor Q through the OUT output;

-

start of the time count at the moment, once it stops the discharge pulse of the capacitor, the transistor Q returns to the inhibition state, thus allowing the start of the charge of the capacitor itself;

-

interruption of the time count in the moment when the voltage in the capacitor reaches the threshold to activate the digital input INP, whose value is normally the half of the supply voltage of the microcontroller 15 (it is say, E / 2 = 2.5 V or E / 2 = 1.65 V);

-

he value reached by the time count present in the microcontroller 15, at the time of counting interruption, It is the result of the measurement and is directly related with the characteristics of water resistivity. He microcontroller 15 is correctly programmed, and has an adequate knowledge base available for this purpose encoded in the microcontroller's memory media, to calculate the resistivity presented by the water after the measurement of capacitor charge time C. The value of the alkalinity or ion concentration in water, which is indicative of the detergent concentration, it is obtained from microcontroller 15 through the stored knowledge base based on the measurement of the resistivity (or of the conductivity) of the liquid.

Referring again to Figure 1, in memory media 16 programs are stored operation or management, which supervise the execution of the cycles of treatment that the machine can perform. In these means of memory 16 are obviously also encoded instructions related to the general functions of machine 1, included the control of the measurement design represented in figure 2. Of course, machine 1 also includes all others. components necessary for normal operation (sensors level, resistance to heat the water, filters, door, safety devices, etc.), which are not represented or described herein since they are not of interest immediate for the purposes of the present invention.

It can be assumed, for reasons of simplicity, that machine 1 is designed to perform the five cycles of following treatment:

to)

a cycle for washing colored clothes;

b)

a cycle for washing synthetic garments;

C)

a powerful cycle for washing resistant and / or very heavy clothing dirty

d)

a fast cycle to wash clothes that are not very dirty; Y

and)

a rinse cycle to remove detergent residues from pretreated garments, such as clothes that are washed hand.

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In another example, the five treatment cycles They may be:

to)

a cycle specifically designed to wash clothes from cotton;

b)

a cycle specifically designed to wash garments of material synthetic;

C)

a cycle specifically designed to wash delicate items, such such as silk or wool garments;

d)

a fast cycle to wash clothes that are not very dirty, presenting said cycle lasting approximately 30 minutes; Y

and)

a rinse cycle to remove detergent residues from pretreated garments, such as clothes that are washed hand.

As in the prior art, cycles a) to d) they comprise a plurality of phases, which provide for an initial load of water, followed by a rotation of the drum and finally a drainage of the water used Said plurality of phases may comprise minus one or more washing phases in the strict sense, with the introduction of the detergent into the tank, one or more rinse phases, with the possible introduction of an additive in the tank, one or more phases of distribution of the laundry load and one or more of centrifuged Some cycles, for example, cycles a) and c), they can also provide for some initial prewash phases, with the introduction of the detergent in the tank. The e) cycle provides, in its place, one or more rinse phases alone, possibly with the introduction into the tank of an additive (softener).

In correspondence with each of the cycles of treatment mentioned above, in memory media 16 there is a respective operation program: In the case exemplified, in memory media 16 will have encoded five programs of operation, which uses microcontroller 15 and which can Carry out the control unit.

According to a first characteristic of the invention, the control system 14 is provided such that, associated with a selection that can be made by one of the Programming keys 13b-13e, two are provided operating programs, corresponding to two cycles of different treatment that the machine can perform. In the way of preferred embodiment of the invention, one of the two programs mentioned above is the corresponding to the cycle of cleared up; The other program may, for example, be the fast cycle. In the non-limiting example described herein, the two Programs mentioned above are associated with a key default programming, which is hereby assumed which is key 13e.

According to a second characteristic of the invention, the control unit 14 is configured to carry carry out one or the other of the two programs mentioned above in function of the value of a characteristic of the water present in the tank 3 after a first charge from the delivery system of water 9, said value being obtained with detection means 17.

In particular, the feature mentioned formerly it is the alkalinity or ion concentration of water loaded in the tank -which is obtained by means of detection 17 of the modes described above - which, as stated, represents the presence of a washing agent.

In the embodiment that is currently considered the preferred one, the initial water charge mentioned above in the tank 3 belongs to a certain detection phase, executed under the control of the microcontroller 14
-programmed for this purpose- when the user presses key 13e. The encoded instructions that the microcontroller 15 uses for the execution of said phase do not belong, however, to the two programs associated with the key 13e, as will be appreciated, said detection phase is executed preliminary at the beginning of one or the other of the two programs in question and, therefore, is different from the corresponding treatment cycles. The preliminary detection phase comprises, as mentioned, an initial load of water from the water supply network 9, by means of valve means 8, for this purpose controlled by the microcontroller 15 to get the water to pass to a predefined compartment of the distributor 6. It is assumed, in the following, that said predefined compartment is the compartment 6a of the prewash detergent. The amount of water loaded in the tank is not much, as an indication between 4 and 6 liters, preferably approximately 5 liters. After loading said amount of water, a rotation step of the drum 3 containing the wash follows. Preferably, the rotation is performed without pause and with a constant rotation direction. The rotation speed is greater than 70 rpm, for example, between 80 and 120 rpm, preferably between approximately 90 and 95 rpm. The preferred speed allows the so-called satellation of the laundry load in the drum 4 to be achieved (that is, the laundry garments tend to adhere to the inner wall of the drum 4, due to the centrifugal force, forming a kind of ring). Thanks to this speed, the repeated passage of laundry items in the water loaded in the tank can be achieved in a relatively short time without causing excessive stress on the clothes. By way of indication, the drum rotation step has an approximate duration of 3 minutes. At the end of the rotation step, possibly with the drum 4 still in motion due to inertia, the control unit 14 obtains, by means of detection 17, the alkalinity or ion concentration value of the water present in the tank. The preliminary detection phase ends with a water drain from the tank 3. For this purpose, the control unit 14 controls the drain pump 12. Given the relatively modest amount of water present in the tank, the complete drain can be carried out in a few seconds, typically between 2 and 3 seconds. The duration of the entire preliminary detection phase is approximately 3 to 3.5 seconds.

The detected alkalinity / concentration value ion is intended to be compared by microcontroller 15 with a certain threshold value, stored in memory media 16 and, according to the result of said comparison, the microcontroller determines which of the two operating programs associated with the key 13a will be executed and then - in the example considered - to what treatment cycle is going to undergo laundry (rinse cycle or fast cycle). In other words, after the execution of the phase of preliminary detection, the control unit will start the execution of One of the programs.

The threshold value referenced previously it can be understood, by way of indication, between 0.8 and 1.5 milliequivalents (mEq) of alkali per liter: a value of alkalinity that can be conveniently adopted as a threshold value It is 1.2 mEq of alkali per liter. However, it should be noted that, with independence of temperature and water hardness in conditions normal, the difference between the concentration of pure water ions and that of the water that contains a washing agent residue is considerable, and that the measurement design of Figure 2 can discriminate the two different conditions autonomously and easily.

Machine 1, in the example considered in this document, it works as indicated below.

The user, after loading the laundry that is going to try on drum 4, press key 13a. Suppose the laundry that has been loaded on the machine has already been pretreated; that is, I know has undergone a washing with detergent. It is the case that happens, normally, with clothes that are washed by hand and that the user You want to rinse on the machine. Then the user turns on the machine 1 by pressing key 13a.

The activation condition of the key 13e generates a signal that is detected at an input of the microcontroller 15, in accordance with the modalities known per se . Said signal informs the microcontroller 15, programmed for it, that the preliminary phase mentioned above will be carried out to detect the degree of alkalinity / ion concentration. Then, the control unit executes said preliminary phase until its completion. As mentioned above, the flow of water charged for the purpose of executing the preliminary phase passes through a specific compartment of the distributor 6; that is, compartment 6a in the example considered in this document. Since the user wishes to carry out only the rinse of the laundry, no detergent has been introduced into said compartment (the user may have introduced a softening agent into the compartment 6c).

Since there will still be detergent residues present in the pretreated laundry, the measured value of alkalinity / ion concentration will be greater (or greater than or equal, depending on the approximation chosen) to the threshold value mentioned above. After said condition, the control unit 14 will issue a command for the execution of the program corresponding to the rinse cycle, which is executed until its completion, in a manner known per se .

Assume now the case in which the user, instead of subjecting the pretreated garments to a rinse, you want carry out a washing operation with the fast cycle. The operations for the purpose are exactly the same as the referred to above, with the difference that in this case the user will also have to introduce a dose of detergent into the relevant compartment of distributor 6 for the cycle in question; that is, compartment 6b.

Also, in this case, the water charged from the water supply network 9 will pass through the compartment 6a, which does not contain detergent and will reach the tank 3 substantially pure. The measured alkalinity / ion concentration value will now be less (or less than or equal to, depending on the approximation chosen) to the threshold value stored previously. Upon verification of said condition, the control unit 14 will issue a command for the execution of the program corresponding to the rapid cycle, which is executed until its completion, in a manner known per se .

From what has been described above, it it follows that the machine 1 is pre-designed to recognize, in a way autonomous, which of the treatment cycles do you want to carry out the user between the two cycles associated with the programming means specific selected. Thus, in the user interface a specific programming key can be removed from the machine (or a position of a selector or a touch screen icon); that is, the one that is traditionally provided for selection of the rinse cycle.

Therefore, the invention allows simplification of the machine's user interface and the reduction of the general dimensions of the same or, presenting the same general dimensions as appliances of the type known, allows to have keys, selectors or viewers of some larger dimensions for greater user comfort.

Of course, without prejudice to the principle of invention, construction details and forms of realization may vary widely in relation to what has been described and illustrated herein purely as example, without departing, therefore, from the scope of the present invention as defined in the appended claims.

As already mentioned, the means of Manual programming of the machine according to the invention can be type of keys or buttons or of the type of rotary selector or selector linear with a number of positions or screen type tactile.

The detection means used in the implementation of the invention can be of any known type suitable for detecting the presence of a washing agent in the water, even if they are different from those described above. For this purpose it is worth mentioning, for example, that turbidity sensors of a type already known per se and used in some models of washing machine or dishwasher available on the market, can be used for the purpose of implementing the invention provided that are perfectly capable of detecting the presence of a washing agent in water.

The machine according to the invention can possibly be of the type equipped with a washing agent distributor with a great autonomy of operation; that is, the type that can retain in one or more containers or deposits provided to such effect, total amounts of washing agents to be used in a plurality of washing treatments as well as to distribute dosed amounts of said agents in the course of each treatment cycle

The best application of the present invention is performs laundry washing machine for domestic use; no However, it is applicable to any washing machine. In the case of a dishwasher for domestic use, for example, the machine can be designed so that it can perform a plurality of cycles of treatment, such as:

to)

a certain cycle of washing dishes; Y

b)

a rinse and / or rinse cycle or soak cycle of dishes.

As in the first embodiment described, the user can manually select the two cycles mentioned above by one and the same device of selection, for example, by pressing on a button provided to such effect. The dishwasher is electronically controlled and it comprises means to detect a characteristic of the liquid loaded in the tank, for example, a conductivity sensor or a alkalinity sensor or a turbidity sensor, as it has been mentioned above for the case of a washing machine wash. According to the detection of said liquid characteristic, the electronic control system discriminates whether to run the first or the second of the aforementioned machine cycles, according to an approach similar to the one described above. In this implementation, the preliminary phase to detect the feature mentioned above will include - instead of step Rotation of the drum provided in the case of the washing machine casting - one step of activating the wash or recirculation pump to spray, using at least one rotating sprayer conventional, with the water loaded in the tank the dishes, being these are deposited in at least one dish tray conventional.

In the examples of the embodiment previously described, the rinse cycle program is associated with specific selection means (key 13e, in the laundry washer example). In one embodiment Alternatively, this program could also be associated with each of the other programming keys, together with the program / cycle respective. In this case, the control system will be pre-designed. so that, each time the machine is used, the preliminary detection phase mentioned above, with the subsequent automatic start of one of the two possible cycles of treatment associated with the selection made by the user.

Claims (14)

1. Washing machine, in particular machine laundry washer, comprising at least one wash tank (3), loading means (7, 8) for supplying a liquid to said tank (3), drainage means (10, 12) to evacuate the liquid from said tank (3), a device for distributing the washing agents (6) and a control system (13, 14, 17), in which the system of control (13, 14, 17) comprises at least:

-

a control unit (14), configured to manage a plurality of treatment cycles that the machine can carry out (one);

-

some memory media (16), in which programs are stored management of said treatment cycles;

-

some programming means (13), to perform a manual selection among a plurality of possible selections (13b-13e), being associated with each selection that it can be done through the programming means (13) so less a respective management program; Y

-

some detection means (17) to detect a characteristic of the liquid loaded in said tank (3), said representative being representative characteristic of the presence of a washing agent in the liquid;

characterized because

-

he control system (13, 14, 17) is arranged in such a way that associated with a selection (13b) that can be made by means of programming means (13) are provided

-

a first management program corresponding to a rinse cycle, Y

-

a second management program corresponding to a wash cycle that comprises one or more washing phases with the supply of an agent washing, and

-

the control unit (14) is configured to carry out said first management program or said second management program in function of a value of said characteristic obtained by means of said detection means (17) after a first liquid charge in said Cuba (3).

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2. Machine according to claim 1, wherein said first load corresponds to a preliminary phase to detect said characteristic and the control unit (14) is configured to control the execution of said preliminary phase in the case in the one that said selection has been made (13b). 3. Machine according to claim 2, wherein said memory means (16) contain a threshold value of said characteristic and the control unit (14) is configured for:

-

detect during this phase preliminary and by means of said detection means (17), the value of said characteristic;

-

make a comparison between the value detected and the threshold value; and

-

start said first management program or said second management program according to the result of said comparison.

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4. Machine according to claim 3, wherein said preliminary phase comprises a final drainage of the liquid from said tank (3) and the control unit (14) is configured to control said drainage after the execution of said comparison and before starting said first management program or said second management program. 5. Machine according to claim 4, wherein The machine is a laundry washing machine, which comprises a drum (4) for laundry, which is mounted in said tank (3) and which can be operated to rotate by means of motor means (5), and wherein said preliminary phase comprises a rotation of said drum (4) and the control unit (14) is configured to control said rotation before executing said comparison. 6. Machine according to claim 5, wherein the speed of said drum (4) during said rotation step is greater than 70 r.p.m .; preferably, between 80 and 100 r.p.m. 7. Machine according to claim 6, wherein the speed is such a speed that allows the satellization of the load of the laundry in said drum (4). 8. Machine according to claim 1, wherein said characteristic is the alkalinity of the liquid or the ion concentration of the liquid. 9. Machine according to at least one of the previous claims, wherein said detection means comprise means for measuring resistivity or conductivity of the liquid 10. Machine according to at least one of the previous claims, wherein said detection means comprise a sensor to detect turbidity and / or a sensor to Detect the hardness of the liquid. 11. Machine according to claim 9, wherein said measuring means comprise:

-

for the minus two electrodes (A, B) provided in the charging circuit of a condenser (C) and intended to be in contact with the liquid loaded in said tank (3);

-

some means (Q) for discharging said capacitor (C);

-

some means (E) for causing a current flow between said electrodes (A, B) through the liquid;

-

some means (15) to measure the time needed to get the load of said capacitor (C) by said current flow; Y

-

some means (15, 16) to calculate indirectly, according to the time of charge of said capacitor (C), the value of the resistivity or conductivity of the liquid and from it the value of said characteristic.

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12. Machine according to claim 5, wherein said rinse cycle comprises one or more phases, providing each phase an initial charge of the liquid in said tank (3), a rotation of the drum (4) and a final drainage of the liquid from said Cuba (3). 13. Machine according to claim 1, wherein said distribution device is of the long autonomy type of operation and said second management program includes information to control said distribution device. 14. Machine according to claim 4, wherein The machine is a dishwashing machine, which includes minus a plate tray (4) in said tank (3), a pump washing or recirculation and at least one spray element provided by said pump, and wherein said phase preliminary comprises an activation of said pump and the unit of control (14) is configured to control said activation before of the execution of said comparison.