EP0946121B1 - Procede de dosage pour introduire un detergent dans un lave-vaisselle - Google Patents

Procede de dosage pour introduire un detergent dans un lave-vaisselle Download PDF

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Publication number
EP0946121B1
EP0946121B1 EP97954371A EP97954371A EP0946121B1 EP 0946121 B1 EP0946121 B1 EP 0946121B1 EP 97954371 A EP97954371 A EP 97954371A EP 97954371 A EP97954371 A EP 97954371A EP 0946121 B1 EP0946121 B1 EP 0946121B1
Authority
EP
European Patent Office
Prior art keywords
conductivity
change
cleaning tank
detergent
metering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97954371A
Other languages
German (de)
English (en)
Other versions
EP0946121A1 (fr
Inventor
Karl Helminger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecolab Engineering GmbH
Original Assignee
Lang Apparatebau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lang Apparatebau GmbH filed Critical Lang Apparatebau GmbH
Publication of EP0946121A1 publication Critical patent/EP0946121A1/fr
Application granted granted Critical
Publication of EP0946121B1 publication Critical patent/EP0946121B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0055—Metering or indication of used products, e.g. type or quantity of detergent, rinse aid or salt; for measuring or controlling the product concentration
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/449—Metering controlling devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/30—Variation of electrical, magnetical or optical quantities
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/07—Consumable products, e.g. detergent, rinse aids or salt

Definitions

  • the invention relates to a metering method for feeding a Detergent to a dishwasher, which has: at least a cleaning tank, one arranged in the cleaning tank Conductivity sensor, a spray device with feedback the sprayed cleaning solution in the cleaning tank as well as a dosing device entering the cleaner into the cleaning tank (see WO-A-9 305 696 and DE-U-29 511 175).
  • the dishwasher for which the dosing method of the present invention is a so-called commercial dishwasher GSM, e.g. in commercial kitchens Is used.
  • Such dishwashers have at least one cleaning tank that contains water.
  • water The cleaning tank is turned into a spray device by a pump fed, which the water above the cleaning tank sprayed the dishes to be washed, the water then falls back into the cleaning tank.
  • the water of the Cleaning tanks become detergent from a dosing device fed.
  • the dosing device is controlled by a controller depending on the concentration of the detergent in the Cleaning tank regulated. This concentration is from one Conductivity sensor determined. This is the circumstance exploited that - provided constant temperatures - a extensive proportionality between the concentration of the Cleaner and the resulting conductivity of the water is available.
  • the conductivity controller compares that of Transmitter delivered measured value with a predetermined target value and activates a metering valve or if the setpoint is undershot a dosing pump. When the setpoint is reached again, it will Dosing valve or dosing pump switched off.
  • the regulation of the metering of the cleaner is by a variety influenced by parameters, such as the type and size the dishwasher, the type and nature of the respective cleaner and the water temperature.
  • parameters such as the type and size the dishwasher, the type and nature of the respective cleaner and the water temperature.
  • the dead time i.e. the time between that Start of the metering of the cleaner and the effectiveness of the Dosing by increasing the conductivity.
  • Influencing factors, that influence the concentration control are mechanical Influences such as positioning of the detergent dosing point, positioning the conductivity measuring cell in the cleaning tank, length of the Rinsing line for powder detergents, flow conditions in the wash liquor, as well as chemical influences such as solubility of the Cleaner product, conductivity / concentration behavior of the Detergent product.
  • the invention has for its object a metering method Feed a cleaner to a dishwasher create, in which achievable dosing accuracy is much higher than with conventional controllers.
  • the dosing method according to the invention is based on the application the fuzzy logic, with heuristic, fuzzy rules is working.
  • These influencing variables of the controlled system are in the subsequent operating phase as a heuristic variable, i.e. as fuzzy parameters of the controlled system, as part of a fuzzy control processed. With the fuzzy control, which during the subsequent operating phase, only the conductivity value is measured or the setpoint deviation is used as a measured variable, while the other influencing factors from the previous Learning phase.
  • a new learning phase is preferably carried out whenever if during the operating phase the setpoint deviation over a predetermined minimum time exceeds a limit. In this case it is assumed that the one carried out in the learning phase Evaluation of the influencing variables is no longer correct and new must be carried out.
  • the commercial dishwasher GSM shown in Figure 1 has a conveyor line 10 which in the dishes to be cleaned Transported in the direction of arrow 11.
  • the conveyor section 10 exists from a conveyor belt running over rollers, the is permeable to water.
  • Under the conveyor line 10 are a first cleaning tank 12, a second cleaning tank 13 and one third cleaning tank 14 arranged in the manner of a cascade are, the water from the first cleaning tank 12 over an overflow 15 overflows into the second cleaning tank 13.
  • Out the second cleaning tank 13 the water runs over one Overflow 16 in the third cleaning tank 14 above and from this the water is discharged into a drain 17.
  • the direction of flow of the water is opposite to the direction of transport 11 of the conveyor line 10.
  • each cleaning tank 12, 13, 14 There is a submersible pump 18 in each cleaning tank 12, 13, 14 arranged that the water from this cleaning tank to a Spray device 19 which pumps the water to that on the Transport device 10 sprayed lying dishes.
  • the Spray device 19 is above the cleaning tank open at the top arranged so that the water sprayed by it into the Cleaning tank falls back.
  • a metering device 22 feeds into the first cleaning tank 12 23 cleaners introduced via a metering line.
  • the dosing device 22 is connected to a water pipe 24 and contains a valve 25, which can be opened by an electromagnet 26 Introduce fresh water into a powder container 27.
  • the Powder container 27 contains powdered cleaner, which in the inflowing water is dissolved.
  • the outlet of the powder container 27 is connected to the metering line 23. If the valve 25 for a certain time is opened, a predetermined flows Amount of water in the powder container 27, whereby a appropriate amount of detergent dissolved and into the metering line 23 is introduced.
  • the detergent concentration in the water that is in the first Cleaning tank 12 is located is from a conductivity transmitter 28 determined in the first cleaning tank 12th is arranged and measures the conductivity of the water. It exists extensive proportionality between the detergent concentration in the Water and the measured conductivity.
  • the electrical output signal the sensor 28 is fed to a controller 29, which, depending on the measured value, the electromagnet 26 of the Valve 25 actuated.
  • the valve 25 is only in the on-off mode operated.
  • FIG. 2 shows an example of a response of the measuring signal x from the measuring sensor 28 to a metering pulse I, which was generated by the metering device 22 and in which the valve 25 was opened over a predetermined time t v in order to supply the cleaning tank 12 with detergent.
  • a dead time T t passes that elapses before the cleaner has any effects on the transducer 28. This dead time takes into account the opening behavior of the valve 25, the duration of the solution of the powdered detergent in the powder container 27 and the running time of the liquid detergent solution in the metering line 23.
  • the dead time T t has ended and an initially steep increase in conductivity begins to a point B at which the measured value is x B.
  • This tip can be attributed to the fact that the cleaner entering the cleaning tank 12 first comes close to the sensor 28 before it is distributed in the bath. This is followed by a drop in the measured value to a point C and finally a slow asymtotic rise to the compensation value D, which represents the last maximum of the curve. This increase is due to the fact that mixing takes place in the cleaning tank during the mixing time T M following the dead time T t .
  • the difference between the measured value x O at the point in time D and the measured value x A at the point in time when the metering takes effect is called the change in concentration KD.
  • the compensation speed is determined by the time T M between points A and D of the response curve.
  • the change in measured value MD is also determined.
  • the change in measured value is determined by the slope of the response curve between points A and B.
  • the cleaning liquor is diluted by the water by the rinse device 20 or by another Water inlet gets into the cleaning tank 12. This Water is fed continuously both during the learning phase as well as during the operational phase.
  • the Dilution rate VV is determined by the gradient of the Decline of the response curve determined after point D.
  • the submersible pump 18 and the Spray device 19 in operation.
  • the controller 29 is shown schematically. It is about a fuzzy controller, in which a fuzzification of the above explained influencing variables is made. This was done for each influencing variable has certain membership functions MF fixed. These are triangular curves or trapezoidal curves that the different ranges of values of the influencing variables in semantic Terms such as "very high”, “high”, “medium”, “low” and “very low” divide.
  • the Influencing variable the corresponding membership value in the Membership function MF determined.
  • An interference level contains various "IF ..., THEN " links of the various influencing factors and finally there is a Defuzzification at which the control signal for the dosing device 22 is generated.
  • the linguistic variables according to rules 1 to 5 are determined and saved during the learning phase. They remain unchanged during an operating phase.
  • the variable according to rule 6 is continuously determined during the operating phase and the metering device 22 is controlled as a function of its chronological course.
  • the measured value x of the transmitter 28 is fed to the fuzzy controller 29, as well as the setpoint x s to which the conductivity is to be regulated.
  • the Dosing device 22a a pump 30, the liquid cleaner pumps a liquid container 31 into the metering line 23.
  • the controller 29 controls the pump 30 by making it either turns on or turns off.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Claims (5)

  1. Procédé de dosage pour amener un agent de nettoyage à un lave-vaisselle comprenant au moins un bac de nettoyage (12), un appareil de mesure de la conductivité (28) disposé dans ce bac, un dispositif d'aspersion (19) avec retour au bac (12) de l'eau projetée, ainsi qu'un dispositif de dosage (22) introduisant l'agent de nettoyage dans le bac (12),
    caractérisé en ce que
    dans une phase d'apprentissage, on effectue en continu pendant un temps donné des additions dosées d'un agent de nettoyage dans le bac de nettoyage (12) et on établit la courbe de la conductivité en fonction du temps obtenu en réponse,
    on tire de cette réponse des grandeurs caractéristiques d'influence (Tt, MV, MD, KV, V V) du système de régulation,
    on établit, pour une phase ultérieure de service, une consigne (xS) de la conductivité,
    dans cette phase ultérieure on établit l'écart de consigne (□x) résultant de la mesure de la conductivité,
    on procède à un dosage par régulation floue, en fonction de l'écart de consigne (□x), en utilisant les grandeurs d'influence obtenues comme variables floues.
  2. Procédé de dosage selon la revendication 1,
    caractérisé en ce que
    les grandeurs d'influence du système de régulation, obtenues à partir de la réponse, sont au moins le temps mort (Tt), la variation de la concentration (KD) entre la valeur de départ (A) et le dernier maximum (D) de la réponse, ainsi que la vitesse d'équilibrage (MV) et/ou la variation de la valeur mesurée (MD) entre le maximum et le minimum de la conductivité.
  3. Procédé de dosage selon la revendication 1 ou 2,
    caractérisé en ce que
    les grandeurs d'influence du système de régulation, données par la réponse, comprennent la vitesse de dilution (VV) produite par l'apport d'eau après le dernier maximum.
  4. Procédé selon une des revendications 1 à 3,
    caractérisé en ce qu'
    on procède à une nouvelle phase d'apprentissage si l'écart de consigne (□x), au bout d'un temps minimal donné, dépasse une valeur limite.
  5. Procédé selon une des revendications 1 à 4,
    caractérisé en ce qu'
    au-delà de la phase d'apprentissage, la valeur (x) de la conductivité est mesurée et en fonction de celle-ci, on évalue la variation de la valeur mesurée en fonction des grandeurs d'influence, et/ou la vitesse d'équilibrage et/ou la variation de la concentration.
EP97954371A 1996-12-18 1997-12-10 Procede de dosage pour introduire un detergent dans un lave-vaisselle Expired - Lifetime EP0946121B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19652733A DE19652733C2 (de) 1996-12-18 1996-12-18 Dosierverfahren zum Zuführen eines Reinigers zu einer Geschirrspülmaschine
DE19652733 1996-12-18
PCT/EP1997/006888 WO1998026704A1 (fr) 1996-12-18 1997-12-10 Procede de dosage pour introduire un detergent dans un lave-vaisselle

Publications (2)

Publication Number Publication Date
EP0946121A1 EP0946121A1 (fr) 1999-10-06
EP0946121B1 true EP0946121B1 (fr) 2000-08-02

Family

ID=7815170

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97954371A Expired - Lifetime EP0946121B1 (fr) 1996-12-18 1997-12-10 Procede de dosage pour introduire un detergent dans un lave-vaisselle

Country Status (13)

Country Link
US (1) US20020117187A1 (fr)
EP (1) EP0946121B1 (fr)
JP (1) JP4001391B2 (fr)
AT (1) ATE195062T1 (fr)
CA (1) CA2275388A1 (fr)
DE (2) DE19652733C2 (fr)
DK (1) DK0946121T3 (fr)
ES (1) ES2150293T3 (fr)
GR (1) GR3034327T3 (fr)
NO (1) NO992955D0 (fr)
NZ (1) NZ336803A (fr)
PT (1) PT946121E (fr)
WO (1) WO1998026704A1 (fr)

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Also Published As

Publication number Publication date
DE19652733C2 (de) 2001-03-01
PT946121E (pt) 2000-12-29
WO1998026704A1 (fr) 1998-06-25
DE19652733A1 (de) 1998-06-25
NO992955L (no) 1999-06-17
DE59702115D1 (de) 2000-09-07
ATE195062T1 (de) 2000-08-15
EP0946121A1 (fr) 1999-10-06
US20020117187A1 (en) 2002-08-29
NZ336803A (en) 2000-03-27
NO992955D0 (no) 1999-06-17
CA2275388A1 (fr) 1998-06-25
ES2150293T3 (es) 2000-11-16
DK0946121T3 (da) 2000-12-18
JP4001391B2 (ja) 2007-10-31
JP2001506151A (ja) 2001-05-15
GR3034327T3 (en) 2000-12-29

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