EP1838917A1 - Method for monitoring a temperature-dependent resistor, particularly in a clothes dryer - Google Patents
Method for monitoring a temperature-dependent resistor, particularly in a clothes dryerInfo
- Publication number
- EP1838917A1 EP1838917A1 EP06743187A EP06743187A EP1838917A1 EP 1838917 A1 EP1838917 A1 EP 1838917A1 EP 06743187 A EP06743187 A EP 06743187A EP 06743187 A EP06743187 A EP 06743187A EP 1838917 A1 EP1838917 A1 EP 1838917A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- heat source
- resistor
- monitoring
- dependent resistor
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/28—Air properties
- D06F2103/32—Temperature
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/28—Electric heating
Definitions
- the invention relates to a method for monitoring a temperature-dependent resistor, in particular a resistor having a negative temperature coefficient (NTC) for measuring the temperature in the vicinity of a heat source.
- the heat source is preferably a heater for heating an air flow in a tumble dryer.
- the invention relates to a method for operating such a tumble dryer and a tumble dryer itself for performing the method.
- NTCs It is known to use in dryers NTCs to monitor temperatures in the dryers.
- the signals of the NTCs are recorded and evaluated in a control device, which is typically designed as a microcontroller, and converted into temperatures, which then serve as the basis for the control of the tumble dryer.
- the NTCs are therefore of great importance for the safety of tumble dryers and are traditionally continuously monitored for cable breakage and / or short circuit.
- the present invention seeks to further develop a known method for monitoring a temperature-dependent resistance and a method for operating a clothes dryer and a known tumble dryer for performing the two methods such that the safety of a device with a Heat source and a temperature-dependent resistor, in particular a clothes dryer, is further increased.
- This object is achieved by the method claimed in claim 1.
- This method is characterized by the following steps: switching on the heat source;
- the first predetermined period of time is suitably chosen as a function of the heat output of the heat sources, the respective ambient temperature and the height of the predetermined temperature threshold suitable. In principle, it can also be zero seconds; then the comparison of the current temperature in the environment of the heat source with the temperature threshold is accompanied by the time the heat source is turned on.
- Resistance temperature characteristic (R over T) of the temperature-dependent resistor a possible change in its behavior or of its characteristic over time known. With such knowledge, erroneous control of the device based on temperature values provided by the temperature-dependent resistor can be prevented. This contributes significantly to the reliability of the device, in particular the tumble dryer.
- the above object is further achieved by a method for operating a clothes dryer, which includes the claimed method for monitoring a temperature-dependent resistance.
- the two claimed methods are preferably realized by a computer program which runs on a control device of the device, preferably the tumble dryer.
- the computer program implements another solution of the stated object.
- the above task is accomplished a clothes dryer with a heat source, with a temperature-dependent resistor and with a control device for controlling the heat source and for monitoring the temperature-dependent resistance, the control device being designed to carry out the above-mentioned methods.
- FIG. 1 shows a tumble dryer designed according to the invention
- FIG. 2 schematically illustrates the method according to the invention.
- FIG. 1 shows a clothes dryer 100 according to the invention with a heat source 110 for heating air, which typically circulates in the tumble dryer for drying laundry. Furthermore, the clothes dryer 100 comprises a temperature-dependent resistor 120, in particular a resistor with a negative temperature coefficient NTC for measuring the temperature of the air flow in the tumble dryer, and a control device 130 for controlling the heat source and monitoring the temperature-dependent resistance.
- a temperature-dependent resistor 120 in particular a resistor with a negative temperature coefficient NTC for measuring the temperature of the air flow in the tumble dryer
- NTC negative temperature coefficient
- the control device 130 is designed to carry out the two methods according to the invention, which are described below.
- FIG. 2 illustrates a method according to the invention for
- NTC temperature dependent resistor
- monitoring of the RT characteristic of the resistor 120 takes place in accordance with method step S3 in view of a possible, undesired temporal change or displacement.
- This is done according to the invention by first checking in accordance with method step S4 whether the temperature measured by the temperature-dependent resistor 120 after a second predetermined period of time after the first time has expired is within a predetermined temperature interval. If this is the case, then it is determined that the temperature-dependent resistance is still functional or that any change or shift of its RT characteristic that may have occurred is currently negligible; see method step S5b.
- the heat source for heating the air flow in the tumble dryer remains active, see scripture S5a, and the tumble dryer is controlled taking into account the temperature values provided by the rated resistance.
- step S4 if it is determined in step S4 that the temperature supplied by the temperature-dependent resistor 120 at the end of the second predetermined time period outside the predetermined temperature interval, it is determined according to the invention that the temperature-dependent resistor is defective; see method step S6b.
- the heat source shut down and a drying process in the dryer no further continued.
- the temperature threshold, the first and second time periods and the temperature interval are each suitable to choose.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06743187T PL1838917T3 (en) | 2005-04-27 | 2006-02-08 | Method for monitoring a temperature-dependent resistor, particularly in a clothes dryer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005019588A DE102005019588A1 (en) | 2005-04-27 | 2005-04-27 | Method for monitoring a temperature-dependent resistance, in particular in a tumble dryer |
PCT/EP2006/050775 WO2006114340A1 (en) | 2005-04-27 | 2006-02-08 | Method for monitoring a temperature-dependent resistor, particularly in a clothes dryer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1838917A1 true EP1838917A1 (en) | 2007-10-03 |
EP1838917B1 EP1838917B1 (en) | 2008-09-03 |
Family
ID=36579896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06743187A Active EP1838917B1 (en) | 2005-04-27 | 2006-02-08 | Method for monitoring a temperature-dependent resistor, particularly in a clothes dryer |
Country Status (8)
Country | Link |
---|---|
US (1) | US7748897B2 (en) |
EP (1) | EP1838917B1 (en) |
CN (1) | CN101166867B (en) |
AT (1) | ATE407253T1 (en) |
DE (2) | DE102005019588A1 (en) |
ES (1) | ES2313652T3 (en) |
PL (1) | PL1838917T3 (en) |
WO (1) | WO2006114340A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2279674B1 (en) * | 2005-03-23 | 2008-08-01 | Ibai, S. Coop. | CLOTHING AND DRYING CLOTHING CLOTHING. |
US8015726B2 (en) * | 2005-06-23 | 2011-09-13 | Whirlpool Corporation | Automatic clothes dryer |
SE536654C2 (en) * | 2011-12-07 | 2014-04-29 | Scania Cv Ab | Method for testing temperature sensors, and a test device |
US20130145644A1 (en) * | 2011-12-13 | 2013-06-13 | Bsh Home Appliances Corporation | Process for operating a washer dryer with a sensor placed between a tub and a heat exchanger, and related washer dryer |
US20130152422A1 (en) * | 2011-12-14 | 2013-06-20 | Bsh Home Appliances Corporation | Dryer with a temperature sensor and process for its operation |
DE102015115535A1 (en) * | 2015-09-15 | 2017-03-16 | Endress + Hauser Wetzer Gmbh + Co Kg | Method for calibrating a temperature sensor located in a process of automation technology |
DE102016200334A1 (en) | 2016-01-14 | 2017-07-20 | BSH Hausgeräte GmbH | Temperature measuring circuit for a household appliance |
DE102016116598B3 (en) * | 2016-09-06 | 2017-11-16 | Miele & Cie. Kg | Method and computer program for heating control of a household appliance via virtual temperature and corresponding household appliance |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5281956A (en) * | 1989-08-11 | 1994-01-25 | Whirlpool Corporation | Heater diagnostics and electronic control for a clothes dryer |
US5235527A (en) * | 1990-02-09 | 1993-08-10 | Toyota Jidosha Kabushiki Kaisha | Method for diagnosing abnormality of sensor |
KR940006250B1 (en) * | 1991-12-23 | 1994-07-13 | 주식회사 금성사 | Drying control method and circuit of complex sensor type |
US5764542A (en) * | 1996-01-11 | 1998-06-09 | Eaton Corporation | Noise filtering utilizing running average |
DE19704213C1 (en) * | 1997-02-05 | 1998-09-17 | Miele & Cie | System for detecting unacceptable conditions in clothes or laundry dryer |
DE19958384A1 (en) * | 1999-12-03 | 2001-06-07 | Bosch Gmbh Robert | Process for detecting a faulty sensor |
KR20020062446A (en) * | 2001-01-20 | 2002-07-26 | 엘지전자주식회사 | The apparatus and the method for sensing drying degree for exhaust type dryer |
DE10156037A1 (en) | 2001-11-15 | 2003-06-05 | Behr Hella Thermocontrol Gmbh | Method for monitoring operation of heater element of motor vehicle interior heater based on comparing actual resistance of heater elements against known resistance temperature characteristic |
DE10221992C1 (en) | 2002-05-17 | 2003-11-20 | Audi Ag | Method for testing the function of a temperature sensor provided in or on a drive unit |
DE10234561A1 (en) | 2002-07-25 | 2004-02-19 | Eichenauer Heizelemente Gmbh & Co. Kg | Method and device for testing the function of an electrical heating device |
DE10329038B3 (en) | 2003-06-27 | 2005-02-24 | Audi Ag | Monitoring motor vehicle part temperature sensor operability, involves checking for defined minimum temperature change over defined period of measurement with starting temperature as reference value |
-
2005
- 2005-04-27 DE DE102005019588A patent/DE102005019588A1/en not_active Withdrawn
-
2006
- 2006-02-08 AT AT06743187T patent/ATE407253T1/en not_active IP Right Cessation
- 2006-02-08 ES ES06743187T patent/ES2313652T3/en active Active
- 2006-02-08 US US11/918,599 patent/US7748897B2/en not_active Expired - Fee Related
- 2006-02-08 PL PL06743187T patent/PL1838917T3/en unknown
- 2006-02-08 EP EP06743187A patent/EP1838917B1/en active Active
- 2006-02-08 WO PCT/EP2006/050775 patent/WO2006114340A1/en active IP Right Grant
- 2006-02-08 CN CN2006800143634A patent/CN101166867B/en active Active
- 2006-02-08 DE DE502006001495T patent/DE502006001495D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2006114340A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1838917B1 (en) | 2008-09-03 |
ES2313652T3 (en) | 2009-03-01 |
PL1838917T3 (en) | 2009-02-27 |
US7748897B2 (en) | 2010-07-06 |
ATE407253T1 (en) | 2008-09-15 |
DE102005019588A1 (en) | 2006-11-09 |
CN101166867A (en) | 2008-04-23 |
US20090028214A1 (en) | 2009-01-29 |
WO2006114340A1 (en) | 2006-11-02 |
DE502006001495D1 (en) | 2008-10-16 |
CN101166867B (en) | 2010-05-19 |
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