DE2645743A1 - LIQUID LEVEL MEASURING DEVICE - Google Patents
LIQUID LEVEL MEASURING DEVICEInfo
- Publication number
- DE2645743A1 DE2645743A1 DE19762645743 DE2645743A DE2645743A1 DE 2645743 A1 DE2645743 A1 DE 2645743A1 DE 19762645743 DE19762645743 DE 19762645743 DE 2645743 A DE2645743 A DE 2645743A DE 2645743 A1 DE2645743 A1 DE 2645743A1
- Authority
- DE
- Germany
- Prior art keywords
- resistance
- current source
- constant current
- liquid level
- transistor
- 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
-
- 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
- G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
- G01F23/246—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 variations of resistance of resistors due to contact with conductor fluid thermal devices
- G01F23/247—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 variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Indicating Measured Values (AREA)
Description
UDG Adolf Schindling AG 6G0D Frankfurt/MainUDG Adolf Schindling AG 6G0D Frankfurt / Main
Gräfstraße 103Graefstrasse 103
Die Erfindung bezieht sich auf eine Einrichtung zum Messen des Flüssigkeitsstandes in einem Behälter, insbesondere einem Kraftstoffbehälter eines Kraftfahrzeuges, mit mehreren in unterschiedlicher Höhe angeordneten Widerstandselementen, deren temperaturabhängige Widerstandsänderung zwischen ein- und ausgetauchtem Zustand erfaßt und zur Steuerung einer Anzeigestufe herangezogen wird.The invention relates to a device for measuring the liquid level in a container, in particular a fuel tank of a motor vehicle, with several resistance elements arranged at different heights, whose temperature-dependent change in resistance between immersed and exited state is detected and used for Control of a display level is used.
Es sind bereits Einrichtungen dieser Gattung bekannt, bei denen jedem üliderstandselement ein Anzeigeelement zugeordnet ist und die Anzeigeelemente in derselben Reihenfolge wie die LJiderstandselemente angeordnet sind. Die Anzeigeelemente bilden somit ein leuchtendes Band, dessen Länge dem jeweiligen Flüssigkeitsstand entspricht. Diese und andere die Widerstandsänderung eines Widerstandselementes zwischen in die Flüssigkeit eingetauchtem und ausgetauchtem Zustand ausnutzende Einrichtungen haben den Nachteil, daß die jeweilige Umgebungstemperatur in die Messung eingeht. Sq kann es beispielsweise geschehen, daß bei tiefen Umgebungstemperaturen die Einrichtung bei Vorhandensein eines leeren Behälters einen vollen Behälter anzeigt und bei hohen Temperaturen trotz eines vollen Behälters die Anzeige einen leeren Behälter angibt.Devices of this type are already known in which a display element is assigned to each resistance element and the display elements are arranged in the same order as the resistor elements. The display elements thus form a luminous band, the length of which corresponds to the respective liquid level. This and others the change in resistance of a resistance element between immersed and immersed in the liquid Devices that exploit the state have the disadvantage that the respective ambient temperature is included in the measurement. Sq it can happen, for example, that at low ambient temperatures the device indicates a full container in the presence of an empty container and at high temperatures despite a full container, the display shows an empty container.
8098 15/03498098 15/0349
- r- - r-
Diese Nachteile der bekannten Einrichtungen sollen durch die Erfindung überwunden werden. Es ist daher Aufgabe der Erfindung, eine Einrichtung zu schaffen, bei der die Umgebungstemperatur nicht oder allenfalls in einem vernachlässigbarem Umfang in die Messung und Anzeige eingeht. Zudem sollen die hierfür erforderlichen Maßnahmen möglichst geringe Kosten verursachen.These disadvantages of the known devices are intended by the invention will be overcome. It is therefore the task of Invention to provide a device in which the ambient temperature is not included in the measurement and display, or only to a negligible extent. In addition, should the measures required for this cause the lowest possible costs.
Diese Aufgabe wird ausgehend von einer Einrichtung der eingangs beschriebenen Gattung dadurch gelöst, daß die einzelnen LJiderstandselemente in einer Reihe hintereinander geschaltet und von einer in Abhängigkeit von der Umgebungstemperatur geregelten Konstantstromquelle gespeist sind.Based on a device of the type described at the outset, this object is achieved in that the individual Resistance elements connected in series one behind the other and are fed by a constant current source regulated as a function of the ambient temperature.
Durch diese erfindungsgemäße Maßnahme wird, wie sich gezeigt hat, eine in einem äußerst breiten Temperaturbereich den Füllstand genau messende und anzeigende Einrichtung erhalten.This measure according to the invention, as has been shown has the level in an extremely wide temperature range Get accurate measuring and display device.
In einer bevorzugten Ausführungsform der Erfindung enthält jedes Ididerstandselement einen frei gespannten Uiderstandsdraht. Hierfür kann beispielsweise ein Draht aus Nickel oder einer Nickellegierung oder dergleichen verwendet werden.In a preferred embodiment of the invention, each resistance element contains a freely tensioned resistance wire. For example, a wire made of nickel or a nickel alloy or the like can be used for this.
Als temperaturgeregelte Konstantstromquelle ist am zweckmäßigsten ein Transistor vorgesehen, der von einem Operationsverstärker angesteuert ist, dessen einer Eingang an einem eine Diode enthaltenden Spannungsteiler und dessen anderer Eingang mit dem Ausgang des Transistors verbunden ist. Bei dieser Ausführungsform wird der Temperaturgang der Diode zur temperaturabhängigen Regelung der Konstantstrcmquelle herangezogen.As a temperature-regulated constant current source, a transistor is most expediently provided, which is from an operational amplifier is controlled, one input of which is connected to a voltage divider containing a diode and the other input of which is connected to the output of the transistor. In this embodiment the temperature response of the diode is used for temperature-dependent control of the constant current source.
8098 1 5/03498098 1 5/0349
Die Erfindung sei anhand der Zeichnung, die ein Schaltbild der Einrichtung zeigt, näher erläutert.The invention is based on the drawing, which is a circuit diagram the device shows, explained in more detail.
Die Einrichtung umfaßt vier LJiderstandselemente 1, 2, 3 und 4, die jeweils aus einer Halterung und einem darauf frei gespannten Nickeldraht bestehen und in verschiedenen Behälterquerschnittsebenen am Behälter selbst oder auf einem in den Behälter ragenden starren Dder flexiblen Halter angebracht sind. Die einzelnen lüiderstandselemente sind elektrisch in Reihe geschaltet und van einer Konstantstromquelle 5 gespeist.The device comprises four resistance elements 1, 2, 3 and 4, which each consist of a holder and a nickel wire freely stretched thereon and in different container cross-sectional planes on the container itself or on one in the Container protruding rigid Dthe flexible holder are attached. The individual resistance elements are electrically in Connected in series and fed by a constant current source 5.
Die Konstantstromquelle 5 enthält einen Transistor G, in dessen Emitter-Kollektor-Kreis die liliderstandselemente 1, 2, 3 und 4 liegen, und einen Operationsverstärker 7, von dem der Transistor 6 angesteuert wird. Der eine Eingang des Operationsverstärkers 7 ist an einen Spannungsteiler Q angeschlossen, in dessen einem Zuieig sine Diode 9 liegt. Der andere Eingang des Operationsverstärkers ist an den Emitter des Transistors G angeschlossen. Die Temperaturregelung der Konstantstromquelle 5 erfolgt über den Temperaturgang der Diode 9. Aus diesem Grunde empfiehlt es sich, zumindest die Diode 9 oder aber die gesamte Konstantstromquelle möglichst in unmittelbarer Nähe der üJiderstandselemente anzuordnen, damit die Diode 9 der gleichen Umgebungstemperatur ausgesetzt ist, wie die bJiderstandselemente.The constant current source 5 contains a transistor G, in the emitter-collector circuit of which the resistance elements 1, 2, 3 and 4 lie, and an operational amplifier 7, from which the transistor 6 is driven. One entrance of the Operational amplifier 7 is connected to a voltage divider Q, in one of which a diode 9 is located. Of the other input of the operational amplifier is connected to the emitter of transistor G. The temperature control of the Constant current source 5 takes place via the temperature curve of the Diode 9. For this reason, it is advisable to use at least the diode 9 or the entire constant current source if possible to be arranged in the immediate vicinity of the resistance elements, so that the diode 9 is exposed to the same ambient temperature as the resistor elements.
Die an den einzelnen LJiderstandselementen abfallenden Spannungen werden jeweils einem als Komparator geschalteten Operationsverstärker 10 bzw. 11, 12, 13 zugeführt und dort mit einerThe voltages dropping across the individual resistance elements are each connected to an operational amplifier connected as a comparator 10 or 11, 12, 13 supplied and there with a
809815/0349809815/0349
-X-3-X-3
Referenzspannung verglichen. Die Ausgänge der einzelnen Operationsverstärker stehen jeweils mit einem ihnen zugeordneten Anzeigeelement 1^, 15, 16 bzu. 17 in Verbindung. Die Anzeigeelemente sind in einer Reihe hintereinander, ein Leuchtband bildend in einem Gehäuse 1B untergebracht.Reference voltage compared. The outputs of each Operational amplifiers are each with a display element assigned to them 1 ^, 15, 16 bzu. 17 in connection. The display elements are arranged in a row one behind the other, forming a light strip, housed in a housing 1B.
809815/0349809815/0349
e ee e
rseiter side
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762645743 DE2645743C2 (en) | 1976-10-09 | 1976-10-09 | Liquid level measuring device |
| GB4185377A GB1537809A (en) | 1976-10-09 | 1977-10-07 | Devices for measuring the level of a liquid in a containe |
| JP12182577A JPS5346766A (en) | 1976-10-09 | 1977-10-11 | Apparatus for measuring filling condition of liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762645743 DE2645743C2 (en) | 1976-10-09 | 1976-10-09 | Liquid level measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2645743A1 true DE2645743A1 (en) | 1978-04-13 |
| DE2645743C2 DE2645743C2 (en) | 1985-11-07 |
Family
ID=5990133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19762645743 Expired DE2645743C2 (en) | 1976-10-09 | 1976-10-09 | Liquid level measuring device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5346766A (en) |
| DE (1) | DE2645743C2 (en) |
| GB (1) | GB1537809A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0008508A1 (en) * | 1978-08-23 | 1980-03-05 | LUCAS INDUSTRIES public limited company | Liquid level sensing apparatus |
| FR2512201A1 (en) * | 1981-09-03 | 1983-03-04 | Messmer Werner Gmbh Co Kg | CIRCUIT FOR THE CONTINUOUS MEASUREMENT OF THE FILLING LEVEL OF A TANK FILLED AT LEAST PARTIALLY WITH LIQUID |
| WO2015036168A1 (en) * | 2013-09-10 | 2015-03-19 | Robert Bosch Gmbh | Novel sensor arrangement for measuring a fill level |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3022398A1 (en) * | 1980-06-14 | 1982-01-07 | Vdo Adolf Schindling Ag, 6000 Frankfurt | DEVICE FOR ELECTRICALLY MONITORING THE LEVEL OF A LIQUID CONTAINED IN A CONTAINER |
| FR2526159A1 (en) * | 1982-04-30 | 1983-11-04 | Jaeger | DEVICE FOR MEASURING ENTIRELY STATIC LEVELS |
| JPS5941747A (en) * | 1982-08-31 | 1984-03-08 | 三菱重工業株式会社 | Refrigerator |
| GB2128340A (en) * | 1982-10-06 | 1984-04-26 | Kliklok Corp | Hot liquid level control |
| DE19750620A1 (en) * | 1997-11-14 | 1999-06-02 | Siemens Ag | Determining liquid level in closed tank |
| GB2340246B (en) * | 1999-08-18 | 2002-03-20 | John Alfred Temple | Hot water monitor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1473132A1 (en) * | 1962-12-03 | 1968-11-07 | Pierre Moreau | Level display device |
| DE2112220A1 (en) * | 1971-03-13 | 1972-09-21 | Fritz Georg | Device for displaying a liquid level |
| DE2423415A1 (en) * | 1974-05-14 | 1975-11-27 | Siemens Ag | Liq. gas level monitoring device - uses positive temperature coefficient resistor as sensor for level detection |
| DE2428778A1 (en) * | 1974-06-14 | 1976-01-02 | Siemens Ag | Indicator for level of liquid - uses positive temperature coefficient resistor as sensor, and light emitting diode as indicator |
-
1976
- 1976-10-09 DE DE19762645743 patent/DE2645743C2/en not_active Expired
-
1977
- 1977-10-07 GB GB4185377A patent/GB1537809A/en not_active Expired
- 1977-10-11 JP JP12182577A patent/JPS5346766A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1473132A1 (en) * | 1962-12-03 | 1968-11-07 | Pierre Moreau | Level display device |
| DE2112220A1 (en) * | 1971-03-13 | 1972-09-21 | Fritz Georg | Device for displaying a liquid level |
| DE2423415A1 (en) * | 1974-05-14 | 1975-11-27 | Siemens Ag | Liq. gas level monitoring device - uses positive temperature coefficient resistor as sensor for level detection |
| DE2428778A1 (en) * | 1974-06-14 | 1976-01-02 | Siemens Ag | Indicator for level of liquid - uses positive temperature coefficient resistor as sensor, and light emitting diode as indicator |
Non-Patent Citations (1)
| Title |
|---|
| H.F. Grave: Elektrische Messung nichtelektrischer Größen (1962) S. 262/263 Abb. 216 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0008508A1 (en) * | 1978-08-23 | 1980-03-05 | LUCAS INDUSTRIES public limited company | Liquid level sensing apparatus |
| FR2512201A1 (en) * | 1981-09-03 | 1983-03-04 | Messmer Werner Gmbh Co Kg | CIRCUIT FOR THE CONTINUOUS MEASUREMENT OF THE FILLING LEVEL OF A TANK FILLED AT LEAST PARTIALLY WITH LIQUID |
| WO2015036168A1 (en) * | 2013-09-10 | 2015-03-19 | Robert Bosch Gmbh | Novel sensor arrangement for measuring a fill level |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2645743C2 (en) | 1985-11-07 |
| JPS5346766A (en) | 1978-04-26 |
| GB1537809A (en) | 1979-01-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |