EP2292139A1 - Process for controlling the operation of a dishwashing machine - Google Patents

Process for controlling the operation of a dishwashing machine Download PDF

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Publication number
EP2292139A1
EP2292139A1 EP20100175422 EP10175422A EP2292139A1 EP 2292139 A1 EP2292139 A1 EP 2292139A1 EP 20100175422 EP20100175422 EP 20100175422 EP 10175422 A EP10175422 A EP 10175422A EP 2292139 A1 EP2292139 A1 EP 2292139A1
Authority
EP
European Patent Office
Prior art keywords
water
level
sump
washing
control unit
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.)
Granted
Application number
EP20100175422
Other languages
German (de)
French (fr)
Other versions
EP2292139B1 (en
Inventor
Enzo Brignone
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.)
Bitron SpA
Original Assignee
Bitron SpA
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 Bitron SpA filed Critical Bitron SpA
Priority to PL10175422T priority Critical patent/PL2292139T3/en
Publication of EP2292139A1 publication Critical patent/EP2292139A1/en
Application granted granted Critical
Publication of EP2292139B1 publication Critical patent/EP2292139B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A47L15/42—Details
    • A47L15/4244—Water-level measuring or regulating arrangements
    • 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
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • 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
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • 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
    • A47L2401/09—Water level
    • 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
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction

Definitions

  • the present invention refers to a process for controlling the operation of a dishwashing machine.
  • the latter comprises a washing tank closed at the bottom by a sump wherein a level sensor is present, a washing pump actuated by an electric motor which makes water circulate in the aforesaid tank and a control unit.
  • Object of the present invention is that of providing a process for controlling the operation of the actuation motor of the washing pump of a dishwashing machine which employs components that are in any case already present for performing other functions.
  • the control process of the invention is based on the use by a control unit of signals generated by a component which is in any case present, such as the level sensor, and that hence does not lead to additional costs. Consequently, the production of a dishwashing machine adapted to operate according to the process of the invention results more economical. In particular, being certain of the correct functioning of the level sensor, the latter can also be used for monitoring the attainment of a watch level which causes the immediate shutdown of the dishwashing machine, without requiring dedicated anti-overflow devices, and with consequent further cost savings.
  • a dishwashing machine comprises a washing tank 10 closed at the bottom by a sump 12 in which a level sensor 14 is mounted.
  • a washing pump 16 driven by an asynchronous electric motor 18 causes the circulation of the water in the tank 10, while a further pump 20 allows its external discharge.
  • the operation of the dishwashing machine is governed by a control unit 22.
  • the level sensor 14 continuously measures the actual value of the water level in the sump 12 during the washing and rinsing steps, and transmits it to the control unit 22 which compares it with a reference value of the level of the water in the sump which is pre-established for each of such steps.
  • the control unit 22 can thus adjust the rotation speed of the motor 18 during the washing and rinsing steps in dependence on the difference existing between the actual value of the level of the water in the sump 12 and the pre-established reference value.
  • the adjustment of the rotation speed of the motor 18 can be carried out by changing the power absorbed through the phase shutting method.
  • the maximum power supplied by the phase shutter and absorbed by the motor 18 can be established by the control unit 22 in dependence on the requirements of the washing step, and in particular it can be greater the more intense the washing action must be.
  • the pressure sensor 14 functions correctly. Consequently, the operation of the latter is previously advantageously verified by the control unit, by ascertaining that, in the water loading step, the value measured by the sensor 14 of the level of the water in the sump 12 continuously increases.
  • the latter can be advantageously used also for monitoring the possibly rising of the water up to a watch level which causes the employment of emergency measures, such as the immediate shutdown of the dishwashing machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

The process controls the operation of a dishwashing machine comprising a washing tank (10) closed at the bottom by a sump (12) wherein a level sensor (14) is mounted, a washing pump (16) operated by an asynchronous electric motor (18) which makes water circulate in said tank (10), and a control unit (22). In such process, a reference value of the level of the water in the sump (12) is pre-established for the washing step and the rinsing step, respectively; the level sensor (14) measures continuously the actual value of the level of the water in the sump (12) during such steps; and the control unit (22) compares in each step the reference value and the actual value of the level of the water in the sump (12) and adjusts the rotation speed of the motor (18) in dependence on the difference existing between such values, as well as checks the operation capability of said sensor (14), by ascertaining that, during the water loading step, the measured value of the level of the water in the sump (12) continuously increases.

Description

  • The present invention refers to a process for controlling the operation of a dishwashing machine.
  • More specifically, the latter comprises a washing tank closed at the bottom by a sump wherein a level sensor is present, a washing pump actuated by an electric motor which makes water circulate in the aforesaid tank and a control unit.
  • It is known to control the actuation motor of a washing pump starting from the measurement of its rotation speed, which is carried out by a suitable instrument, or by varying its power supply frequency by means of an inverter device. Such control systems are reliable, but require the presence of dedicated components - such as a rotation speed measurer or an inverter - which cause the complexity and cost of the dishwashing machine to increase.
  • Object of the present invention is that of providing a process for controlling the operation of the actuation motor of the washing pump of a dishwashing machine which employs components that are in any case already present for performing other functions.
  • Such object is achieved due to a process in which:
    • a reference value of the level of the water in the sump is pre-established for the washing step and the rinsing step, respectively,
    • the level sensor measures continuously the actual value of the level of the water in the sump during said steps, and
    • said control unit compares in each step the reference value and the actual value of the level of the water in the sump and adjusts the rotation speed of said motor in dependence on the difference existing between said values, as well as checks the operation capability of said sensor by ascertaining that, during the water loading step, the measured value of the level of the water in the sump continuously increases.
  • The control process of the invention is based on the use by a control unit of signals generated by a component which is in any case present, such as the level sensor, and that hence does not lead to additional costs. Consequently, the production of a dishwashing machine adapted to operate according to the process of the invention results more economical. In particular, being certain of the correct functioning of the level sensor, the latter can also be used for monitoring the attainment of a watch level which causes the immediate shutdown of the dishwashing machine, without requiring dedicated anti-overflow devices, and with consequent further cost savings.
  • Further advantages and characteristics of the present invention will be clearer from the following detailed description, carried out with reference to the enclosed drawings provided as a non-limiting example, in which:
    • the single figure is a schematic representation of the main components of a dishwashing machine in which the control process of the invention is implemented.
  • A dishwashing machine comprises a washing tank 10 closed at the bottom by a sump 12 in which a level sensor 14 is mounted. A washing pump 16 driven by an asynchronous electric motor 18 causes the circulation of the water in the tank 10, while a further pump 20 allows its external discharge.
  • The operation of the dishwashing machine is governed by a control unit 22. In particular, the level sensor 14 continuously measures the actual value of the water level in the sump 12 during the washing and rinsing steps, and transmits it to the control unit 22 which compares it with a reference value of the level of the water in the sump which is pre-established for each of such steps.
  • The control unit 22 can thus adjust the rotation speed of the motor 18 during the washing and rinsing steps in dependence on the difference existing between the actual value of the level of the water in the sump 12 and the pre-established reference value. In particular, the adjustment of the rotation speed of the motor 18 can be carried out by changing the power absorbed through the phase shutting method. For example, the maximum power supplied by the phase shutter and absorbed by the motor 18 can be established by the control unit 22 in dependence on the requirements of the washing step, and in particular it can be greater the more intense the washing action must be.
  • It is therefore critical, for the purpose of performing the adjustment process, that the pressure sensor 14 functions correctly. Consequently, the operation of the latter is previously advantageously verified by the control unit, by ascertaining that, in the water loading step, the value measured by the sensor 14 of the level of the water in the sump 12 continuously increases. In addition, in order to ensure the correct functioning of the sensor 14, the latter can be advantageously used also for monitoring the possibly rising of the water up to a watch level which causes the employment of emergency measures, such as the immediate shutdown of the dishwashing machine.
  • Naturally, without detriment to the principle of the invention, the embodiment details and embodiments can be widely varied with respect to that described as a mere example above, without departing from the claimed scope.

Claims (3)

  1. Process for controlling the operation of a dishwashing machine comprising a washing tank (10) closed at the bottom by a sump (12) wherein a level sensor (14) is mounted, a washing pump (16) operated by an asynchronous electric motor (18) which circulates water in said tank (10), and a control unit (22), in which process:
    - a reference value of the level of the water in the sump (12) is pre-established for the washing step and the rinsing step, respectively,
    - the level sensor (14) measures continuously the actual value of the level of the water in the sump (12) during said steps, and
    - said control unit (22) compares in each step the reference value and the actual value of the level of the water in the sump (12) and adjusts the rotation speed of said motor (18) in dependence on the difference existing between said values, as well as checks the operation capability of said sensor (14) by ascertaining that, during the water loading step, the measured value of the level of the water in the sump (12) increases continuously.
  2. Process according to claim 1, wherein the rotation speed of the motor (18) is adjusted by changing the power absorbed through the phase shutting method.
  3. Process according to claim 2, wherein the maximum power absorbed is established by the control unit (22) in dependence on the requirements of the washing step.
EP10175422.4A 2009-09-07 2010-09-06 Process for controlling the operation of a dishwashing machine Not-in-force EP2292139B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10175422T PL2292139T3 (en) 2009-09-07 2010-09-06 Process for controlling the operation of a dishwashing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO2009A000684A IT1395418B1 (en) 2009-09-07 2009-09-07 PROCEDURE FOR CHECKING THE FUNCTIONING OF A DISHWASHER MACHINE.

Publications (2)

Publication Number Publication Date
EP2292139A1 true EP2292139A1 (en) 2011-03-09
EP2292139B1 EP2292139B1 (en) 2015-11-11

Family

ID=42097358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10175422.4A Not-in-force EP2292139B1 (en) 2009-09-07 2010-09-06 Process for controlling the operation of a dishwashing machine

Country Status (3)

Country Link
EP (1) EP2292139B1 (en)
IT (1) IT1395418B1 (en)
PL (1) PL2292139T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20111247A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF ONE OR MORE CONTAINERS POSITIONED WITH CONCAVITIES TOWARDS UPWARDS WITHIN THE ABOVE DISHWASHER
ITTO20111246A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF FOAM IN THE SAFE DISHWASHER
EP2772175A1 (en) * 2013-02-28 2014-09-03 LG Electronics, Inc. Dishwasher and method of controlling the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589057A1 (en) * 1985-10-25 1987-04-30 Licentia Gmbh Dish washer with three rinsing stages
JPH0759709A (en) * 1993-08-30 1995-03-07 Matsushita Electric Ind Co Ltd Dish-washer
DE19828768A1 (en) * 1998-06-27 2000-01-05 Aeg Hausgeraete Gmbh Dish washing machine with circulating pump for circulating cleaning fluid in cleaning tank
JP2001198071A (en) * 2000-01-19 2001-07-24 Matsushita Electric Ind Co Ltd Dishwasher
EP1277431A1 (en) * 2001-07-18 2003-01-22 Electrolux Home Products Corporation N.V. Domestic appliance with an adjustable liquid distributor and the method to control the distributor
DE102004050396A1 (en) * 2004-10-15 2006-04-27 Electrolux Home Products Corporation N.V. Drain and recirculation arrangement for dishwasher, has controller to stop operation of drain pump and actuate circulation pump when liquid level in dishwasher sump is below required level

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2589057A1 (en) * 1985-10-25 1987-04-30 Licentia Gmbh Dish washer with three rinsing stages
JPH0759709A (en) * 1993-08-30 1995-03-07 Matsushita Electric Ind Co Ltd Dish-washer
DE19828768A1 (en) * 1998-06-27 2000-01-05 Aeg Hausgeraete Gmbh Dish washing machine with circulating pump for circulating cleaning fluid in cleaning tank
JP2001198071A (en) * 2000-01-19 2001-07-24 Matsushita Electric Ind Co Ltd Dishwasher
EP1277431A1 (en) * 2001-07-18 2003-01-22 Electrolux Home Products Corporation N.V. Domestic appliance with an adjustable liquid distributor and the method to control the distributor
DE102004050396A1 (en) * 2004-10-15 2006-04-27 Electrolux Home Products Corporation N.V. Drain and recirculation arrangement for dishwasher, has controller to stop operation of drain pump and actuate circulation pump when liquid level in dishwasher sump is below required level

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20111247A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF ONE OR MORE CONTAINERS POSITIONED WITH CONCAVITIES TOWARDS UPWARDS WITHIN THE ABOVE DISHWASHER
ITTO20111246A1 (en) * 2011-12-30 2013-07-01 Indesit Co Spa DISHWASHER AND METHOD FOR DETECTION OF FOAM IN THE SAFE DISHWASHER
EP2772175A1 (en) * 2013-02-28 2014-09-03 LG Electronics, Inc. Dishwasher and method of controlling the same
AU2014201047B2 (en) * 2013-02-28 2015-10-29 Lg Electronics Inc. Dishwasher and a method of controlling the same
US9861249B2 (en) 2013-02-28 2018-01-09 Lg Electronics Inc. Dishwasher and a method for controlling the same

Also Published As

Publication number Publication date
EP2292139B1 (en) 2015-11-11
ITTO20090684A1 (en) 2011-03-08
PL2292139T3 (en) 2016-04-29
IT1395418B1 (en) 2012-09-14

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