WO2002090855A1 - Capteur d'humidite absolue permettant le reglage d'un equipement de sechage - Google Patents

Capteur d'humidite absolue permettant le reglage d'un equipement de sechage Download PDF

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Publication number
WO2002090855A1
WO2002090855A1 PCT/US2002/014723 US0214723W WO02090855A1 WO 2002090855 A1 WO2002090855 A1 WO 2002090855A1 US 0214723 W US0214723 W US 0214723W WO 02090855 A1 WO02090855 A1 WO 02090855A1
Authority
WO
WIPO (PCT)
Prior art keywords
absolute humidity
drying
cycle
humidity
drying cycle
Prior art date
Application number
PCT/US2002/014723
Other languages
English (en)
Inventor
Andrian I. Kouznetsov
Anthony J. Jenkins
Original Assignee
Edwards Systems Technology, Incorporated
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 Edwards Systems Technology, Incorporated filed Critical Edwards Systems Technology, Incorporated
Publication of WO2002090855A1 publication Critical patent/WO2002090855A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • 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
    • D06F58/30—Drying processes 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/64—Radiation, e.g. microwaves

Definitions

  • the present invention relates to sensing devices. More particularly, the invention relates to sensing devices used to control drying equipment.
  • Drying equipment such as clothes dryers usually have a set of control parameters which can be set to dry items such as clothes, dishes, wood, etc.
  • Control parameters such as: (1) temperature of the air inside the drying chamber, (2) air flow rate, and (3) duration of the drying cycle can be used to determine how long it will take to dry items such as clothes.
  • the air temperature and air flow rate can be selected from a set of pre-determined values, whereas the duration of the drying cycle can be controlled by setting a timer.
  • the drying time must be estimated. This can be very inefficient, especially with an inexperienced users, resulting in a waste of energy and time.
  • the dryer is automatically turned off when the sensor has indicated that the items in the dryer are dry. This will result in savings in energy and time, and will add convenience.
  • the method for determining a drying cycle has the steps of measuring absolute humidity within a drying apparatus before the drying apparatus starts a drying cycle.
  • a baseline absolute humidity is determined from the measured absolute humidity drift.
  • Drift is then compensated for using the baseline absolute humidity.
  • Absolute humidity is again measured within the drying apparatus after the drying apparatus starts the drying cycle. The end of the drying cycle is determined using the measured absolute humidity.
  • a device that determines a drying cycle has an absolute humidity sensor that measure absolute humidity within a drying apparatus before and after the drying apparatus starts a drying cycle.
  • a baseline absolute humidity determiner in communication with the absolute humidity sensor determines a baseline absolute humidity from the measured absolute humidity.
  • a drift compensator is in communication with the baseline humidity determinator and compensates for drift using the baseline absolute humidity.
  • An end of cycle determiner determines the end of the drying cycle using the measured absolute humidity and is in communication with the absolute humidity sensor.
  • a system for determining a drying cycle includes an absolute humidity measuring means for measuring absolute humidity within a drying apparatus before and after the drying apparatus starts a drying cycle, and a baseline absolute humidity determining means for determining a baseline absolute humidity from the measured absolute humidity.
  • a drift compensating means is provided for compensating for drift using the baseline absolute humidity
  • an end of cycle determining means is provided for determining the end of the drying cycle using the measured absolute humidity.
  • FIG. 1 is an illustration of an infrared (IR) absorption absolute humidity sensor .
  • FIG. 2 is a flow diagram showing the method steps of the present invention.
  • FIG. 3 is a graph of an absolute humidity profile.
  • This invention provides an absolute humidity sensor which can detect when items within a dryer are dry.
  • a drying cycle control system includes an infrared absorption sensor that measures water molecules (absolute humidity) in the air. This measurement is used to determine when the contents of the dryer have reached a defined dryness.
  • absolute humidity sensors could be used in other embodiments of the invention.
  • FIG. 1 illustrates an infrared (IR) absorption absolute humidity sensor of the present invention.
  • the absolute humidity sensor can be located in the drying chamber exhaust.
  • the sensor could also be located inside the drying chamber or in a special sampling system.
  • the special sampling system could be arranged to deliver air from the chamber to the sensors.
  • special care should be taken to prevent water condensation on the sensor or its electronics. This can be achieved by placing the sensor in a location where the temperature will be above the Dew Point level.
  • an IR absorption absolute humidity sensor is used.
  • the base can be a printed circuit board (PCB) to which the source 120, detector 130, and other electronics are mounted.
  • the diffuser 110 is located between a gas flow path and detection chamber 140. This will prevent the exposure of sensitive sensor components to the full force and flow of gas. In this embodiment of the invention the gas is allowed to diffuse into a plastic reflective detection chamber 140.
  • the diffuser 110 has a filter 150, which can be an oil, dust and moisture filter, an air gap 160, and a plurality of diffusion holes 170. The filter 150 is further operable to remove harmful materials, such as VOCs, dust particles, lint or moisture from the sample prior to measurement.
  • the source 120 and detector 130 are located within the detection chamber 140.
  • Detection chamber 5 can be coated with a material known to reflect infrared radiation, such as gold, in order to facilitate detection.
  • the gas sensor as illustrated in FIG. 1 operates under the principal of infrared absorption. This principal states that a gas will proportionately absorb infrared radiation or other radiant energy having particular characteristics, such as a particular wavelength or range of wavelengths. Thus, the amount of a particular gas component is proportional to the difference between the amount of source radiation and the amount of detected radiation.
  • a measurement can be made by exposing the gas sample to infrared energy having the appropriate characteristics for the gas component of interest, and measuring the amount of unabsorbed radiation. The measurement can be compared to a predetermined reference value established under known conditions. For example, the reference value can be established when there is an absence of the gas of interest.
  • the detector of the IR radiation is a Perkin-Elmer® thermopile detector from the TPS535 family with an interference filter that selects the IR spectral band of 2.72+ 0.1 microns.
  • the source is an incandescent miniature IR lamp (the 4115 lamp of Gilway®.) The optical distance between the source and the detector is about one inch.
  • the IR source is pulsed with a frequency of about 1 Hz and a duty cycle of about 50%. Pulsing of the IR source makes the measurements of unabsorbed energy more accurate compared to continuous operation of the IR sensor.
  • the IR source 120 and the IR detector 130 are connected to sensor electronics on PCB 100.
  • the sensor electronics control the source 120 and processes the signal from the detector 130.
  • the result of the signal processing is the absolute humidity value of the sample. This value could be either communicated to the main control unit, or could be further processed by the absolute humidity sensor electronics.
  • the control algorithm could reside either in the sensor processing unit or elsewhere in the control system.
  • the absolute humidity sensor is complemented by a temperature sensor. This will provide additional information for the control algorithm.
  • a number of absolute humidity sensors and temperature sensors can be used.
  • FIG. 2 illustrates the steps that are taken by the control system to determine an end of drying cycle.
  • step 200 the absolute humidity is measured before a drying cycle is initiated. Measured absolute humidity is used as a baseline for the control algorithm in step 210.
  • step 220 the ambient concentration is used as a baseline in order to determine long-term drift for the sensor.
  • the sensor After the drying cycle starts, the sensor starts measuring the absolute humidity values for a given period in step 230. For example, a period of approximately one second can be used to provide an absolute humidity profile to the control algorithm.
  • step 240 the profile is used by the control algorithm to calculate the duration of the drying cycle.
  • the control algorithm could also control the air intake rate and temperature. Once these measurements are taken, many different algorithms could be used to create an absolute humidity profile. The particular selection would depend on the specific dryer equipment as well as cost and performance requirements. A more complex algorithm normally requires more computational power, and thus increases the cost of the equipment, while providing better control.
  • a threshold is established.
  • the absolute humidity is then used to calculate how dry items in the dryer are. If this calculated value meets the threshold, the drying cycle will end.
  • the first threshold algorithm is based on determining the ambient level of humidity before the drying cycle and finishing the drying cycle when the absolute humidity level in the drying chamber gets close to ambient, indicating that the clothes are dry.
  • the threshold is calculated as:
  • Threshold Ambient_Humidity * Dryness_Factor .
  • the dryness factor is always greater than 1 and can be set to reach a specific dryness.
  • the second threshold algorithm is based on the slope (rate of change) of absolute humidity.
  • the algorithm continuously calculates the rate of change of the absolute humidity level.
  • the dry cycle is terminated when the rate of change reaches a specific level.
  • a more generic threshold based algorithm includes the continuous calculation of a set of parameters from the absolute humidity profile. The calculated parameters are used to define a time when the process should be stopped. One such parameter could be the rate of change, absolute humidity value, etc.
  • the profile is analyzed to predict the dry cycle time based on this analysis.
  • the result of the analysis is a time required to dry items in the drying chamber.
  • the function could be a lookup table, a polynomial or any other easy to calculate function.
  • Particular functions should be derived as characteristics of the particular drying equipment.
  • the preset is the parameter that characterizes the required dryness. A variation of this algorithm does not use the average value, but the integral value - the area under the curve.
  • Dry_time function (integral_humidity (from Tl to T2)) where Tl is calculated as a moment of time when the absolute humidity reaches the particle threshold and T2 when the absolute humidity falls below the other threshold (see FIG. 3).
  • the algorithm may used both threshold and analysis-based calculations.
  • the expected dry time is calculated using the above equation.
  • the dry cycle is then determined using this estimated time, along with a function, such as function

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer un cycle de séchage comprenant les étapes consistant à mesurer l'humidité absolue dans un appareil de séchage avant que l'appareil de séchage ne démarre un cycle de séchage, puis à déterminer une humidité absolue de référence à partir de l'humidité absolue mesurée. La dérive est compensée par l'utilisation de l'humidité absolue de référence; l'humidité absolue étant mesurée dans l'appareil de séchage une fois que l'appareil de séchage a démarré le cycle de séchage. La fin du cycle de séchage est déterminée à l'aide de l'humidité de absolue mesurée.
PCT/US2002/014723 2001-05-10 2002-05-10 Capteur d'humidite absolue permettant le reglage d'un equipement de sechage WO2002090855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28978901P 2001-05-10 2001-05-10
US60/289,789 2001-05-10

Publications (1)

Publication Number Publication Date
WO2002090855A1 true WO2002090855A1 (fr) 2002-11-14

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2458078A1 (fr) * 2010-11-29 2012-05-30 Electrolux Home Products Corporation N.V. Sèche-linge à tambour rotatif et procédé de contrôle d'un sèche-linge à tambour rotatif
CN107489008A (zh) * 2016-06-10 2017-12-19 Bsh家用电器有限公司 用于求取冷凝干燥机中最终剩余湿度的方法以及适用该方法的冷凝干燥机
EP3521504A4 (fr) * 2016-09-30 2019-10-09 Wuxi Filin Electronics Co., Ltd. Sèche-linge, procédé et appareil permettant de calculer la valeur d'humidité de vêtements dans un sèche-linge
WO2020089198A1 (fr) * 2018-10-30 2020-05-07 Henkel Ag & Co. Kgaa Procédé et dispositif pour un appareil electroménager transportant l'air
WO2022120365A1 (fr) * 2020-12-03 2022-06-09 Sigma-Aldrich Co. Llc Procédés de séchage pour revêtements spme biocompatibles
CN117781620A (zh) * 2024-02-23 2024-03-29 临朐天利生物制品有限公司 一种槐米烘干系统

Citations (5)

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Publication number Priority date Publication date Assignee Title
US3896558A (en) * 1972-11-08 1975-07-29 Lovgrens Byggnads Ab Alfred Method of controlling drying of timber in a closed room
US4221058A (en) * 1979-05-25 1980-09-09 Scm Corporation Humidity responsive control for dryers
DE3239576A1 (de) * 1982-10-25 1984-04-26 Moisture Control & Measurement Ltd., Wetherby Verfahren und vorrichtung zur feuchtigkeitsmessung
US4795871A (en) * 1986-10-20 1989-01-03 Micro Dry, Inc. Method and apparatus for heating and drying fabrics in a drying chamber having dryness sensing devices
EP1006328A1 (fr) * 1998-12-01 2000-06-07 Esswein S.A. Procédé de suivi de l'évolution du séchage et dispositif de mise en oeuvre

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896558A (en) * 1972-11-08 1975-07-29 Lovgrens Byggnads Ab Alfred Method of controlling drying of timber in a closed room
US4221058A (en) * 1979-05-25 1980-09-09 Scm Corporation Humidity responsive control for dryers
DE3239576A1 (de) * 1982-10-25 1984-04-26 Moisture Control & Measurement Ltd., Wetherby Verfahren und vorrichtung zur feuchtigkeitsmessung
US4795871A (en) * 1986-10-20 1989-01-03 Micro Dry, Inc. Method and apparatus for heating and drying fabrics in a drying chamber having dryness sensing devices
EP1006328A1 (fr) * 1998-12-01 2000-06-07 Esswein S.A. Procédé de suivi de l'évolution du séchage et dispositif de mise en oeuvre

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012072530A1 (fr) * 2010-11-29 2012-06-07 Electrolux Home Products Corporation N.V. Sèche-linge à tambour rotatif et procédé de commande d'un sèche-linge à tambour rotatif
AU2011335141B2 (en) * 2010-11-29 2015-01-15 Electrolux Home Products Corporation N.V. Rotatable-drum laundry drier and method of controlling a rotatable-drum laundry drier
US9255359B2 (en) 2010-11-29 2016-02-09 Electrolux Home Products Corporation N.V. Rotatable-drum laundry drier and method of controlling a rotatable-drum laundry drier
EP2458078A1 (fr) * 2010-11-29 2012-05-30 Electrolux Home Products Corporation N.V. Sèche-linge à tambour rotatif et procédé de contrôle d'un sèche-linge à tambour rotatif
CN107489008A (zh) * 2016-06-10 2017-12-19 Bsh家用电器有限公司 用于求取冷凝干燥机中最终剩余湿度的方法以及适用该方法的冷凝干燥机
CN107489008B (zh) * 2016-06-10 2021-04-20 Bsh家用电器有限公司 用于运行冷凝干燥机的方法以及冷凝干燥机
US11015282B2 (en) 2016-09-30 2021-05-25 Wuxi Filin Electronics Co., Ltd. Clothes dryer, method and device for calculating humidity value of clothes in clothes dryer
EP3521504A4 (fr) * 2016-09-30 2019-10-09 Wuxi Filin Electronics Co., Ltd. Sèche-linge, procédé et appareil permettant de calculer la valeur d'humidité de vêtements dans un sèche-linge
WO2020089198A1 (fr) * 2018-10-30 2020-05-07 Henkel Ag & Co. Kgaa Procédé et dispositif pour un appareil electroménager transportant l'air
US20220002932A1 (en) * 2018-10-30 2022-01-06 Henkel Ag & Co. Kgaa Method and device for an air-guiding domestic appliance
US12116718B2 (en) * 2018-10-30 2024-10-15 Henkel Ag & Co. Kgaa Method and device for an air-guiding domestic appliance
WO2022120365A1 (fr) * 2020-12-03 2022-06-09 Sigma-Aldrich Co. Llc Procédés de séchage pour revêtements spme biocompatibles
CN117781620A (zh) * 2024-02-23 2024-03-29 临朐天利生物制品有限公司 一种槐米烘干系统
CN117781620B (zh) * 2024-02-23 2024-04-26 临朐天利生物制品有限公司 一种槐米烘干系统

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