Global Patent Index - EP 1001226 A2

EP 1001226 A2 2000-05-17 - Ultrasonic sensor for smoke extracting hoods

Title (en)

Ultrasonic sensor for smoke extracting hoods

Title (de)

Ultraschall-Sensor für eine Dunstabzugshaube

Title (fr)

Capteur à ultrasons pour hotte aspiratrice de buée

Publication

EP 1001226 A2 (DE)

Application

EP 99122361 A

Priority

DE 19851884 A

Abstract (en)

The sensor (5) monitors steam from cooking pots and has a system-specific resonant frequency. An electronic monitoring circuit is provided, which sweeps the frequency band of the ultrasound transmitter (5a) signal in the area around the resonant frequency from both sides in predetermined intervals during the sensor operation. The circuit measures the maximum amplitude of the transmitter signal, to form an average frequency. The average frequency is taken to be the resonant frequency until the next time it is measured and amended.

Abstract (de)

Die Erfindung bezieht sich auf einen Ultraschall-Sensor für eine Dunstabzugshaube, wobei der Sensor den vom Kochgut zur Dunstabzugshaube aufsteigenden Wrasen überwacht. Es erfolgt ein automatischer Abgleich der Temperatur- und Alterungsdrift des Sensors. Zu diesem Zwecke wird zyklisch während des laufenden Betriebs des Sensors eine Überprüfung der Resonanzfrequenz vorgenommen, wobei deren Verschiebung erkannt, durch ein statistisches Berechnungsverfahren die neue Resonanzfrequenz festgestellt und für den weiteren Betrieb des Sensors verwendet wird. <IMAGE>

IPC 1-7 (main, further and additional classification)

F24C 15/20; G10K 11/00

IPC 8 full level (invention and additional information)

B06B 1/02 (2006.01); F24C 15/20 (2006.01)

CPC (invention and additional information)

B06B 1/0261 (2013.01); F24C 15/2021 (2013.01)

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

EP 1001226 A2 20000517; EP 1001226 A3 20030122; EP 1001226 B1 20040929; DE 19851884 A1 20000518; US 6324889 B1 20011204

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