EP1001226A2 - Capteur à ultrasons pour hotte aspiratrice de buée - Google Patents

Capteur à ultrasons pour hotte aspiratrice de buée Download PDF

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Publication number
EP1001226A2
EP1001226A2 EP99122361A EP99122361A EP1001226A2 EP 1001226 A2 EP1001226 A2 EP 1001226A2 EP 99122361 A EP99122361 A EP 99122361A EP 99122361 A EP99122361 A EP 99122361A EP 1001226 A2 EP1001226 A2 EP 1001226A2
Authority
EP
European Patent Office
Prior art keywords
frequency
ultrasonic sensor
sensor according
monitoring circuit
sensor
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
EP99122361A
Other languages
German (de)
English (en)
Other versions
EP1001226B1 (fr
EP1001226A3 (fr
Inventor
Henry Dipl.-Ing. Fluhrer (Fh)
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.)
Diehl AKO Stiftung and Co KG
Original Assignee
Diehl AKO Stiftung and Co KG
Diehl Controls Nuernberg GmbH and Co KG
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 Diehl AKO Stiftung and Co KG, Diehl Controls Nuernberg GmbH and Co KG filed Critical Diehl AKO Stiftung and Co KG
Publication of EP1001226A2 publication Critical patent/EP1001226A2/fr
Publication of EP1001226A3 publication Critical patent/EP1001226A3/fr
Application granted granted Critical
Publication of EP1001226B1 publication Critical patent/EP1001226B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0261—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken from a transducer or electrode connected to the driving transducer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems

Definitions

  • the invention relates to an ultrasonic sensor for an extractor hood with automatic adjustment of the temperature and aging drift, whereby the ultrasonic sensor, consisting of transmitter and receiver, from the food to the cooker hood ascending vapors are monitored and being the ultrasonic sensor has a system-specific resonance frequency.
  • the invention proposes the features characterized in claim 1.
  • the essence of the invention is, therefore, that the monitoring circuit operates the ultrasound sensor at predetermined time intervals in succession with different frequencies in a frequency range close to the resonance frequency and thereby detects the occurring amplitudes to the maximum.
  • a frequency of the sensor is assigned to each such maximum and an average frequency f (q) is determined from several such individual frequencies, which is initially used as the new resonance frequency f (o). This applies until a new attempt to reconcile is made.
  • Each such attempt is carried out for a very short time so as not to disturb the ongoing operation of the ultrasonic sensor when monitoring the vapor.
  • the frequency of the attempts is determined empirically.
  • the monitoring circuit when traversing the frequency band the occurring Determines frequency values assigned to maximum amplitudes and stores that the monitoring circuit from the frequency distribution of the respective maximum amplitudes and thus the associated frequency values in a statistical calculation process the standard deviation and the center frequency f (q) are calculated and that they use this frequency as the resonance frequency f (o) for the operation of the sensor used until the next detected change in the center frequency f (q).
  • This statistically calculated center frequency corresponds to the above-mentioned average frequency and in the best case is the same as the one originally specified Resonance frequency f (o), but it is at least in the vicinity.
  • the standard deviation and the center frequency f (q) are stored at a predetermined frequency distance from the resonance frequency f (o) lie, such as ⁇ 1 kHz, ⁇ 2 kHz.
  • a particularly useful development of the invention provides that the ultrasonic sensor Transmitter and receiver in one housing that contains it alternately works in the transmitting and receiving mode and the vapors in the reflection process scans.
  • the monitoring circuit has a microcontroller as an essential component on, on the one hand the control of the fan of the extractor hood and on the other initiates the automatic drift compensation. This automatic comparison also enables the compensation of the temperature drift in the same test cycle, so that no special effort is required for this.
  • a microcontroller 1 with a microcomputer 1a is located at an output A1 a control circuit 2 for controlling the fan motor 8 of an extractor hood.
  • the speed of the motor 8 does not depend on that of one shown heated food controlled rising vapors. The requirement which speed is assigned to which amount of ascending vapors the control circuit 2 from the microcomputer 1a.
  • the microcontroller 1 has an oscillator 3 at an output A2 and this one Sensor control 4 downstream.
  • the output signal of the oscillator 3 is on an input E1 of the microcontroller 1 is returned and enables there Measurement of the output frequency on the oscillator.
  • the sensor control 4 receives via a second input, which is located at the output A3 of the microcontroller 1 Switching signal, which switches between transmission and reception mode downstream ultrasound sensor 5 performs.
  • This ultrasonic sensor is in an extractor hood installed at a suitable location and gropes in the reflection process the vapors 6 rising from a food not shown above the reflector 6a. In this ultrasonic sensor 5 there are a transmitter 5a and a Installed receiver 5b, which is operated by the sensor control 4 can be switched on alternately.
  • the signal of the receiver 5b the so-called echo signal, originated from the Reflection on the vapor 6 is given to the input of an amplifier 7, which is connected to an input E2 of the microcontroller 1. Via an exit A4 of the microcontroller 1, the signal amplification at the amplifier 7 is set.
  • FIG. 2 shows the resonance curve f (o) of an ultrasound sensor 5.
  • the typical resonance frequency of such a sensor is 200 kHz.
  • this resonance curve can move towards lower or higher Shift frequencies. Compensate for this shift and the ultrasonic sensor 5 must always be operated with the currently given resonance frequency Core problem of the invention.
  • This deviation from the resonance frequency f (o) is determined briefly again and again in a cyclical sequence during the operation of the Ultrasonic sensor when monitoring the vapor.
  • the Control frequency for the ultrasonic sensor by adjusting the oscillator 3 in a repeated passage through the frequency range below and above the Changed resonance frequency.
  • the oscillator is increasingly in Detuned towards lower and then towards higher frequencies than the resonance frequency.
  • the amplitude maximum of the echo signal is in each case measured via the amplifier 7. This process is repeated several times. The number of amplitude maxima, which are measured at -1 kHz or +1 kHz, will be saved. The same applies to the frequency -2 kHz or +2 kHz to the resonance frequency.
  • the new center frequency f (q) is calculated according to a statistical one Evaluation procedure via the calculation of the standard deviation.
  • This statistical evaluation is as a possible way of calculating this Center frequency.
  • the invention is not based on the use of this calculation method limited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Fire-Detection Mechanisms (AREA)
EP99122361A 1998-11-11 1999-11-10 Capteur à ultrasons pour hotte aspiratrice de buée Expired - Lifetime EP1001226B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19851884A DE19851884A1 (de) 1998-11-11 1998-11-11 Ultraschall-Sensor für eine Dunstabzugshaube
DE19851884 1998-11-11

Publications (3)

Publication Number Publication Date
EP1001226A2 true EP1001226A2 (fr) 2000-05-17
EP1001226A3 EP1001226A3 (fr) 2003-01-22
EP1001226B1 EP1001226B1 (fr) 2004-09-29

Family

ID=7887347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99122361A Expired - Lifetime EP1001226B1 (fr) 1998-11-11 1999-11-10 Capteur à ultrasons pour hotte aspiratrice de buée

Country Status (3)

Country Link
US (1) US6324889B1 (fr)
EP (1) EP1001226B1 (fr)
DE (2) DE19851884A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10109252C1 (de) * 2001-02-26 2002-10-31 Rational Ag Verfahren zum Bestimmen zumindest einer Gargutgröße eines Garguts und/oder zumindest eines Garparameters über Schallwellen sowie Vorrichtung hierzu
EP2420743A1 (fr) * 2010-08-17 2012-02-22 BSH Bosch und Siemens Hausgeräte GmbH Hotte de cuisine dotée d'un dispositif de détection ultrasonique de fumée et son procédé de contrôle
CN102374562A (zh) * 2010-08-17 2012-03-14 博西华电器（江苏）有限公司 具有烟气自动检测装置的吸油烟机
EP2420741A3 (fr) * 2010-08-17 2012-07-18 BSH Bosch und Siemens Hausgeräte GmbH Système de contrôle pour hotte de cuisine dotée d'un dispositif de détection automatique de fumée et procédé de contrôle
CN107255349A (zh) * 2017-06-26 2017-10-17 广东美的暖通设备有限公司 传感器温度修正方法、装置及计算机可读存储介质
CN109508511A (zh) * 2018-12-24 2019-03-22 中国航空工业集团公司西安飞机设计研究所 频率响应分析测量中扫频方法

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0129139D0 (en) * 2001-12-05 2002-01-23 Sra Dev Ltd Ultrasonic generator system
DE10215043A1 (de) * 2002-04-05 2003-10-23 Diehl Ako Stiftung Gmbh & Co Einrichtung zur Zustandserfassung an einer Platte oder Wand eines Haushaltsgerätes
DE10310143A1 (de) * 2003-03-07 2004-09-16 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Verfahren und Vorrichtung zur Bestimmung der Resonanzfrequenz eines Resonanzkreises
KR100584309B1 (ko) * 2003-07-16 2006-05-26 엘지전자 주식회사 전자 레인지의 오염물질 배출장치 및 배출방법
DE102005025787B3 (de) * 2005-06-04 2007-01-04 Diehl Ako Stiftung & Co. Kg Dunstabzugshaube und Verfahren zum Steuern einer Dunstabzugshaube
DE102005063350B4 (de) * 2005-06-04 2008-04-24 Diehl Ako Stiftung & Co. Kg Dunstabzugshaube
DE102009061087B3 (de) * 2008-04-18 2012-06-14 Denso Corporation Ultraschallsensor
US20100126275A1 (en) * 2008-11-24 2010-05-27 Greg Leyh Self-calibrating ultrasound systems and methods
GB2479696B (en) * 2009-02-06 2013-01-30 Zevex Inc Air bubble detector
DE102012024975A1 (de) 2012-12-20 2014-06-26 Diehl Ako Stiftung & Co. Kg Dunstabzugshaube und Verfahren zum Steuern des Betriebs einer Dunstabzugshaube
DE102013022023B4 (de) 2013-12-20 2020-10-08 Diehl Ako Stiftung & Co. Kg Dunstabzugshaube und Verfahren zum Steuern des Betriebs einer Dunstabzugshaube
US11125446B2 (en) * 2019-11-25 2021-09-21 Bsh Home Appliances Corporation Ultrasonic filtration device for extractor hood
US20230149213A1 (en) * 2021-11-18 2023-05-18 Johnson & Johnson Surgical Vision, Inc. On-the-fly tuning for piezoelectric ultrasonic handpieces

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967143A (en) * 1974-10-10 1976-06-29 Oki Electric Industry Company, Ltd. Ultrasonic wave generator
EP0443141A2 (fr) * 1990-02-21 1991-08-28 DIEHL GMBH & CO. Arrangement de couplage pour commander un ventilateur
DE19510731A1 (de) * 1994-08-22 1996-02-29 Diehl Gmbh & Co Ultraschall-Strecke in schmalen Kanälen von Gehäusen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4243945A1 (de) * 1992-12-23 1994-06-30 Bosch Siemens Hausgeraete Dunstabzugshaube mit einer akustischen Sensorstrecke
US5991234A (en) * 1998-06-11 1999-11-23 Trw Inc. Ultrasonic sensor system and method having automatic excitation frequency adjustment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967143A (en) * 1974-10-10 1976-06-29 Oki Electric Industry Company, Ltd. Ultrasonic wave generator
EP0443141A2 (fr) * 1990-02-21 1991-08-28 DIEHL GMBH & CO. Arrangement de couplage pour commander un ventilateur
DE19510731A1 (de) * 1994-08-22 1996-02-29 Diehl Gmbh & Co Ultraschall-Strecke in schmalen Kanälen von Gehäusen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10109252C1 (de) * 2001-02-26 2002-10-31 Rational Ag Verfahren zum Bestimmen zumindest einer Gargutgröße eines Garguts und/oder zumindest eines Garparameters über Schallwellen sowie Vorrichtung hierzu
EP2420743A1 (fr) * 2010-08-17 2012-02-22 BSH Bosch und Siemens Hausgeräte GmbH Hotte de cuisine dotée d'un dispositif de détection ultrasonique de fumée et son procédé de contrôle
CN102374562A (zh) * 2010-08-17 2012-03-14 博西华电器（江苏）有限公司 具有烟气自动检测装置的吸油烟机
EP2420741A3 (fr) * 2010-08-17 2012-07-18 BSH Bosch und Siemens Hausgeräte GmbH Système de contrôle pour hotte de cuisine dotée d'un dispositif de détection automatique de fumée et procédé de contrôle
CN102374562B (zh) * 2010-08-17 2015-11-25 博西华电器（江苏）有限公司 具有烟气自动检测装置的吸油烟机
CN107255349A (zh) * 2017-06-26 2017-10-17 广东美的暖通设备有限公司 传感器温度修正方法、装置及计算机可读存储介质
CN107255349B (zh) * 2017-06-26 2019-11-22 广东美的暖通设备有限公司 传感器温度修正方法、装置及计算机可读存储介质
CN109508511A (zh) * 2018-12-24 2019-03-22 中国航空工业集团公司西安飞机设计研究所 频率响应分析测量中扫频方法
CN109508511B (zh) * 2018-12-24 2023-06-23 中国航空工业集团公司西安飞机设计研究所 频率响应分析测量中扫频方法

Also Published As

Publication number Publication date
EP1001226B1 (fr) 2004-09-29
DE19851884A1 (de) 2000-05-18
US6324889B1 (en) 2001-12-04
DE59910644D1 (de) 2004-11-04
EP1001226A3 (fr) 2003-01-22

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