DE4129696A1 - Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring - Google Patents

Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring

Info

Publication number
DE4129696A1
DE4129696A1 DE19914129696 DE4129696A DE4129696A1 DE 4129696 A1 DE4129696 A1 DE 4129696A1 DE 19914129696 DE19914129696 DE 19914129696 DE 4129696 A DE4129696 A DE 4129696A DE 4129696 A1 DE4129696 A1 DE 4129696A1
Authority
DE
Germany
Prior art keywords
phototransistor
emitting diode
diode
light emitting
semi
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.)
Withdrawn
Application number
DE19914129696
Other languages
German (de)
Inventor
Egmont Dr Med Gistl
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19914129696 priority Critical patent/DE4129696A1/en
Publication of DE4129696A1 publication Critical patent/DE4129696A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/04—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by dip members, e.g. dip-sticks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G01F23/292—Light, e.g. infrared or ultraviolet
    • G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels

Abstract

The appts. for measuring the limit levels of liquids has a measurement sensor consisting of a combination of a light emitting diode (L) and phototransistor (F). An electrical circuit is arranged so that a light emitting diode indicates when a limit level is reached and also enables functional monitoring of the system. The measurement sensor is pref. mounted in a semi-open tube. ADVANTAGE - Economically priced for installation in motor vehicles, e.g. by layman.

Description

Zur Bestimmung der Grenzwert-Höhe von Flüssigkeitsspiegeln sind zahlreiche Methoden bekannt, z. B. durch Schwimmer, Druckdifferenzmesser u. a. In Kraftfahrzeugen werden ab Werk, im Rahmen der sog. Check-Kontrolle, Warnmesser angeboten.There are numerous for determining the limit value level of liquid levels Known methods, e.g. B. by floats, pressure difference meters and. a. In motor vehicles are ex works, as part of the so-called check control, warning knife offered.

Der Zweck dieser Erfindung ist die sehr preiswerte Einrichtung zur Nachrüstung in einem Kfz. wozu nur laienhafte Kenntnisse erforderlich sind.The purpose of this invention is the very inexpensive facility for retrofitting a motor vehicle for which only amateur knowledge is required.

Zur Messung des Flüssigkeitsstands wird als Sensor eine gabelartige Kombination aus Leuchtdiode und Fototransistor verwendet.A fork-like combination is used as a sensor to measure the liquid level used from light emitting diode and photo transistor.

Fig. 1 zeigt die Meßeinrichtung Fig. 1 shows the measuring device

Fig. 2 die elektrische Schaltung. Fig. 2 shows the electrical circuit.

Der Ölmeßstab wird durch eine röhrenförmige Anordnung, wie in Fig. 1 dargestellt, ersetzt. Das Rohr ist an seinem unteren Ende halbseitig geöffnet, hier sind Leuchtdiode (L) und Fototransistor (F) untergebracht. Tritt zwischen Leuchtdiode und Fototransistor eine Flüssigkeit, so wird der Lichtstrom teilweise absorbiert und damit der Widerstand des Fototransistors erhöht. Diese Widerstandsänderung wird zur Anzeige gebracht. Dabei muß die obere Begrenzung des Fototransistors in Höhe des gewünschten Grenzpegels angeordnet sein. Die elektrische Schaltung besteht aus einer einfachen Stabilisation der Betriebsspannung der Leuchtdiode (L), um den Lichtaustritt konstant zu halten. Mit dem Regelwiderstand (R) wird die Steuerspannung einjustiert - etwa 700 mV -. Ist der Fototransistor hochohmig, so wird der Kondensator (C) aufgeladen. Während dieser Zeit ist T1 gesperrt und die Anzeige-Leuchtdiode (A) leuchtet kurz auf. Dies dient zur Funktionskontrolle der Einrichtung beim Einschalten. Die zweite Aufgabe des Kondensators (C) besteht darin, daß kurzzeitige Widerstandsänderungen des Fototransistors, wie sie beim An- oder Kurvenfahren des Kfz. auftreten, nicht zur Anzeige gebracht werden, da der Kondensator die Spannung nicht sofort abfallen läßt.The oil dipstick is replaced by a tubular arrangement as shown in Fig. 1. The tube is open on one side at its lower end, here the light-emitting diode (L) and photo transistor (F) are housed. If a liquid occurs between the LED and the phototransistor, the luminous flux is partially absorbed and the resistance of the phototransistor is increased. This change in resistance is displayed. The upper limit of the phototransistor must be arranged at the desired limit level. The electrical circuit consists of a simple stabilization of the operating voltage of the light-emitting diode (L) in order to keep the light output constant. The control voltage is adjusted with the variable resistor (R) - approx. 700 mV -. If the phototransistor has a high resistance, the capacitor (C) is charged. During this time T 1 is blocked and the indicator LED (A) lights up briefly. This is used to check the function of the device when it is switched on. The second task of the capacitor (C) is that brief changes in resistance of the phototransistor, such as when starting or cornering the motor vehicle. occur, can not be displayed because the capacitor does not drop the voltage immediately.

Ist der Flüssigkeitspegel soweit abgesunken, daß zwischen Leuchtdiode und Fototransistor keine Flüssigkeit mehr steht, wird der Fototransistor niederohmig, T1 wird gesperrt und die Spannung an der Basis von T2 steigt, so daß T2 leitend wird, und die Warnlampe brennt.If the liquid level has dropped so far that there is no longer any liquid between the light-emitting diode and the phototransistor, the phototransistor becomes low-resistance, T 1 is blocked and the voltage at the base of T 2 rises, so that T 2 becomes conductive, and the warning lamp burns.

Zum Sensor müssen lediglich zwei und zur Anzeigediode nur ein Leitungsdraht gezogen werden.Only two lead wires to the sensor and only one lead wire to the display diode to be pulled.

Die halboffene Stelle des Meßrohrs wird von der Kurbelwelle abgewandt, so daß mechanische Beschädigungen des Sensors nicht möglich sind. Pegel-Grenzwertmessungen sind auch bei stationären Motoren und Flüssigkeitsbehältern sowie bei anderen Flüssigkeiten als Öl möglich.The half-open point of the measuring tube is turned away from the crankshaft, so that mechanical damage to the sensor is not possible. Level limit measurements are also for stationary motors and liquid containers and possible with liquids other than oil.

Claims (3)

1. Die Einrichtung zur Grenz-Pegelmessung von Flüssigkeiten ist dadurch gekennzeichnet, daß als Meßfühler eine Kombination aus Leuchtdiode und Fototransistor verwendet wird.1. The device for limit level measurement of liquids is characterized in that a combination of light-emitting diode and phototransistor is used as the sensor. 2. Die Einrichtung nach Anspruch 1 ist dadurch gekennzeichnet, daß die elektrische Schaltung so ausgelegt ist, daß eine Leuchtdiode das Erreichen des Flüssigkeitsgrenzstandes anzeigt und dieselbe Diode eine Funktionskontrolle des Systems ermöglicht.2. The device according to claim 1 is characterized in that the electrical Circuit is designed so that a light-emitting diode reaching the Liquid level and the same diode indicates a function check of the system. 3. Die Einrichtung nach Anspruch 1 ist dadurch gekennzeichnet, daß der Meßfühler in einem halbseitig geöffneten Rohr untergebracht ist.3. The device according to claim 1 is characterized in that the Sensor is housed in a half-open tube.
DE19914129696 1991-09-06 1991-09-06 Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring Withdrawn DE4129696A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19914129696 DE4129696A1 (en) 1991-09-06 1991-09-06 Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19914129696 DE4129696A1 (en) 1991-09-06 1991-09-06 Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring

Publications (1)

Publication Number Publication Date
DE4129696A1 true DE4129696A1 (en) 1992-02-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19914129696 Withdrawn DE4129696A1 (en) 1991-09-06 1991-09-06 Vehicle engine oil level limit measuring appts. - has light emitting diode and phototransistor in semi-open tube whereby diode is also used for system functional monitoring

Country Status (1)

Country Link
DE (1) DE4129696A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420651A1 (en) * 1994-06-14 1995-12-21 Tobias Kramer Container liquid level control device esp. for IC engine oil sump
DE29507670U1 (en) * 1995-05-09 1996-09-19 Thera Ges Fuer Patente Level detector for flowable goods
DE19528289A1 (en) * 1995-08-02 1997-02-06 Walter Mehl Detector determining at least one filling level value in tank of oil heating plant - equipped with electric controllable burner and filling level sensor system produces output signal activating switch off of burner if oil level is at distance h2 from base

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2128252B1 (en) * 1971-06-07 1973-01-25 Jasper, Andreas, Dipl.-Ing., 8000 München LIQUID LEVEL INDICATOR
DE2542231A1 (en) * 1975-09-17 1977-03-31 Canon Kk LIQUID QUANTITY DETECTOR
SU605108A1 (en) * 1976-04-12 1978-04-30 Ивановский Энергетический Институт Имени В.И.Ленина Loose material pulse-time photoelectric level gauge
DE3021705A1 (en) * 1979-08-15 1981-04-09 Benno Wettingen Aargau Perren SELF-MONITORING WARNING SYSTEM
DE3240047A1 (en) * 1982-10-28 1984-05-03 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Device in washing machines or dishwashers
SU1372189A1 (en) * 1986-04-28 1988-02-07 Киевский Политехнический Институт Им.50-Летия Великой Октябрьской Социалистической Революции Digital optical level indicator
DE3821221A1 (en) * 1988-06-23 1988-11-10 Klaus Dipl Ing Becker Electrical device with container monitoring
SU1582019A1 (en) * 1987-10-08 1990-07-30 Белорусская сельскохозяйственная академия )device for determining level of ground water

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2128252B1 (en) * 1971-06-07 1973-01-25 Jasper, Andreas, Dipl.-Ing., 8000 München LIQUID LEVEL INDICATOR
DE2542231A1 (en) * 1975-09-17 1977-03-31 Canon Kk LIQUID QUANTITY DETECTOR
SU605108A1 (en) * 1976-04-12 1978-04-30 Ивановский Энергетический Институт Имени В.И.Ленина Loose material pulse-time photoelectric level gauge
DE3021705A1 (en) * 1979-08-15 1981-04-09 Benno Wettingen Aargau Perren SELF-MONITORING WARNING SYSTEM
DE3240047A1 (en) * 1982-10-28 1984-05-03 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Device in washing machines or dishwashers
SU1372189A1 (en) * 1986-04-28 1988-02-07 Киевский Политехнический Институт Им.50-Летия Великой Октябрьской Социалистической Революции Digital optical level indicator
SU1582019A1 (en) * 1987-10-08 1990-07-30 Белорусская сельскохозяйственная академия )device for determining level of ground water
DE3821221A1 (en) * 1988-06-23 1988-11-10 Klaus Dipl Ing Becker Electrical device with container monitoring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420651A1 (en) * 1994-06-14 1995-12-21 Tobias Kramer Container liquid level control device esp. for IC engine oil sump
DE29507670U1 (en) * 1995-05-09 1996-09-19 Thera Ges Fuer Patente Level detector for flowable goods
DE19528289A1 (en) * 1995-08-02 1997-02-06 Walter Mehl Detector determining at least one filling level value in tank of oil heating plant - equipped with electric controllable burner and filling level sensor system produces output signal activating switch off of burner if oil level is at distance h2 from base

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Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OR8 Request for search as to paragraph 43 lit. 1 sentence 1 patent law
8122 Nonbinding interest in granting licenses declared
8105 Search report available
8139 Disposal/non-payment of the annual fee