DE10331577A1 - Diesel engine fuel sensor, has ring capacitor with temperature sensor integrated in protrusion of inner electrode into fuel flow - Google Patents

Diesel engine fuel sensor, has ring capacitor with temperature sensor integrated in protrusion of inner electrode into fuel flow Download PDF

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Publication number
DE10331577A1
DE10331577A1 DE2003131577 DE10331577A DE10331577A1 DE 10331577 A1 DE10331577 A1 DE 10331577A1 DE 2003131577 DE2003131577 DE 2003131577 DE 10331577 A DE10331577 A DE 10331577A DE 10331577 A1 DE10331577 A1 DE 10331577A1
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DE
Germany
Prior art keywords
fuel
measuring element
sensor
inner electrode
diesel engine
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Granted
Application number
DE2003131577
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German (de)
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DE10331577B4 (en
Inventor
Ralf Bantzhaff
Arno Marto
Frank Pechhold
Hans Houben
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Priority to DE2003131577 priority Critical patent/DE10331577B4/en
Publication of DE10331577A1 publication Critical patent/DE10331577A1/en
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Publication of DE10331577B4 publication Critical patent/DE10331577B4/en
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/226—Construction of measuring vessels; Electrodes therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; viscous liquids; paints; inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties

Abstract

A diesel engine fuel sensor has a ring capacitor (2) measurement element with a temperature sensor (1) integrated in the inner electrode (3) where it protrudes (3a) into the fuel flow through the electrode gap.

Description

Die Erfindung betrifft einen Sensor zum Bestimmen des Kraftstoffes für einen Dieselmotor mit einem kapazitiven Messelement, in dessen Elektrodenspalt der zu bestimmende Kraftstoff eingeführt wird.The The invention relates to a sensor for determining the fuel for a Diesel engine with a capacitive measuring element, in the electrode gap the fuel to be determined is introduced.

Ein derartiger Sensor ist aus der DE 10060419 bekannt und dient dazu, bei einem Dieselmotor die Art des jeweiligen Kraftstoffes zu erfassen und zwischen mineralischem Dieselkraftstoff und Biodieselkraftstoff, wie beispielsweise Rapsölmethylesther RME oder Palmölmethylesther PME zu unterscheiden.Such a sensor is from the DE 10060419 is known and serves to detect the nature of the respective fuel in a diesel engine and to distinguish between mineral diesel fuel and biodiesel fuel, such as rapeseed oil methyl ester RME or palm oil methyl ester PME.

Nachteilig bei dem bekannten Sensor ist es, dass er nicht in der Lage ist, auch die Temperatur des Kraftstoffes zu be stimmen, so dass für diesen Zweck ein separater Temperatursensor vorgesehen sein muss.adversely the known sensor is that he is unable to also to tune the temperature of the fuel so that for this Purpose a separate temperature sensor must be provided.

Die der Erfindung zu Grunde liegende Aufgabe besteht daher darin, den Sensor der eingangs genannten Art so auszubilden, dass er auch die Temperatur des Kraftstoffes bestimmen kann.The Therefore, the object underlying the invention is the, Sensor of the type mentioned in such a way that he also the Temperature of the fuel can determine.

Diese Aufgabe wird gemäß der Erfindung durch ein Temperaturmesselement gelöst, das in das kapazitive Messelement integriert ist.These Task is carried out according to the invention a temperature measuring element solved, which is integrated in the capacitive measuring element.

Besonders bevorzugte Ausbildungen und Weiterbildungen des erfindungsgemäßen Sensors sind Gegenstand der Patentansprüche 2 bis 5.Especially preferred embodiments and further developments of the sensor according to the invention are Subject of the claims 2 to 5.

Bei dem erfindungsgemäßen Sensor kann durch die Integration des Temperaturmesselementes in das kapazitive Messelement d. h, durch die dadurch mögliche integrierte Temperaturmessung auf einen separaten Temperatursensor verzichtet werden, was die Kosten herabsetzt und eine Platzersparnis darstellt. Für die Kraftstoffbestimmung und die Temperaturmessung ist nur ein Sensor erforderlich und es können beide Informationen über die Art des Kraftstoffes und seine Temperatur von einem einzigen Sensor abgefragt werden.at the sensor according to the invention can by the integration of the temperature measuring element in the capacitive Measuring element d. h, by the possible integrated temperature measurement to dispense with a separate temperature sensor, which the Reduces costs and represents a space saving. For fuel determination and the temperature measurement is only one sensor required and it can both information about the type of fuel and its temperature of a single Sensor to be queried.

Durch die Platzierung des Temperaturmesselementes in der Innenelektrode eines Ringkondensators ergibt sich darüber hinaus ein einfacher und kostengünstiger Aufbau des gesamten Sensors. Eine Verdämmung des Fließquerschnittes für den Kraftstoff wird vermieden.By the placement of the temperature measuring element in the inner electrode a ring capacitor also results in a simpler and cheaper Structure of the entire sensor. A damming of the flow cross-section for the Fuel is avoided.

Im Folgenden wird anhand der zugehörigen Zeichnung ein besonders bevorzugtes Ausführungsbeispiel des erfindungsgemäßen Sensors näher beschrieben. Es zeigenin the The following is based on the accompanying drawing a particularly preferred embodiment the sensor according to the invention described in more detail. Show it

1 eine seitliche Schnittansicht des Ausführungsbeispiels des erfindungsgemäßen Sensors und 1 a side sectional view of the embodiment of the sensor according to the invention and

2 den stirnseitigen Bereich des in 1 dargestellten Sensors in einer seitlichen Schnittansicht in seiner in die Kraftstoffleitung eingebauten Position. 2 the frontal area of the in 1 illustrated sensor in a side sectional view in its installed in the fuel line position.

Der in der Zeichnung dargestellte Sensor zum Bestimmen der Art des Kraftstoffes für einen Dieselmotor weist ein kapaziti ves Messelement, nämlich einen Ringkondensator auf, der aus einer Außenelektrode 2 und einer Innenelektrode 3 besteht, die Kapazitätsflächen bilden, wobei der zu bestimmende Kraftstoff in den Elektrodenspalt zwischen der Außenelektrode 2 und der Innenelektrode 3 eingeführt wird. Anhand der dadurch bewirkten Kapazitätsänderung können verschiedene Kraftstoffe bestimmt werden.The sensor shown in the drawing for determining the type of fuel for a diesel engine has a kapaziti ves measuring element, namely a ring capacitor, which consists of an outer electrode 2 and an inner electrode 3 forming the capacity surfaces, wherein the fuel to be determined in the electrode gap between the outer electrode 2 and the inner electrode 3 is introduced. On the basis of the capacity change caused thereby different fuels can be determined.

Die Außenelektrode 2 und die Innenelektrode 3'sind in einem Gehäuse 4 aufgenommen, in dem sich auch eine elektronische Schaltung 7 befindet, an der die Sensorausgangssignale liegen.The outer electrode 2 and the inner electrode 3 ' are in a housing 4 which included an electronic circuit 7 is located where the sensor output signals are located.

Die Innenelektrode 3 ist bei dem in 1 dargestellten Ausführungsbeispiel hohlzylindrisch ausgebildet, wobei die kraftstoffseitige Stirnfläche des Hohlzylinders durch eine Stirnwand geschlossen ist. In der in dieser Weise geformten und geschlossenen Innenelektrode 3 ist ein Temperaturmesselement 1 aufgenommen, das dazu dient, die Temperatur des Kraftstoffes zu bestimmen.The inner electrode 3 is at the in 1 illustrated embodiment, a hollow cylinder, wherein the fuel-side end face of the hollow cylinder is closed by an end wall. In the thus formed and closed inner electrode 3 is a temperature measuring element 1 received, which serves to determine the temperature of the fuel.

Wie es in 1 dargestellt ist, ist dazu ein aus zwei Halbschalen gefertigter Träger 5 passgenau im Inneren des Innenelektrode 3 aufgenommen, wobei der Träger 5 an seiner Stirnseite das Temperaturmesselement 1 hält.As it is in 1 is shown, is a made of two half-shells carrier 5 perfectly fitting inside the inner electrode 3 taken, the carrier 5 on its front side, the temperature measuring element 1 holds.

Die Stirnwand der Innenelektrode 3 ist bei dem in 1 dargestellten Ausführungsbeispiel mit einer in die Kraftstoffleitung vorstehenden Ausbauchung oder Auswölbung 3a versehen, in der sich das Temperaturmesselement 1 befindet. Der Träger 5 dient dazu, das Temperaturmesselement 1 positionsgenau aufzunehmen.The end wall of the inner electrode 3 is at the in 1 illustrated embodiment with a protruding into the fuel line bulge or bulge 3a provided in which the temperature measuring element 1 located. The carrier 5 serves to the temperature measuring element 1 to record accurately.

Bei einer derartigen Ausbildung ragt die Ausbauchung 3a mit dem darin angeordneten Temperaturmesselement 1 über die Außenelektrode 2 in die Kraftstoffleitung vor, wenn der Sensor in die Kraftstoffleitung 6 eingebaut ist, wie es in 2 dargestellt ist. Das ermöglicht ein schnelles Ansprechverhalten.In such a configuration, the bulge protrudes 3a with the temperature measuring element arranged therein 1 over the outer electrode 2 in the fuel line before, when the sensor into the force fuel line 6 is built in, as is in 2 is shown. This allows a fast response.

Wenn der Sensor in die Kraftstoffleitung 6 eingebaut ist, wie es in 2 dargestellt ist, taucht er in den Kraftstoff in der Kraftstoffleitung 6 ein, derart, dass die Ausbauchung 3a der Innenelektrode 3 von Kraftstoff umflossen wird und das Temperaturelement 1 schnell und genau die Temperatur des Kraftstoffs in der Kraftstoffleitung 6 ermitteln kann. Gleichzeitig kann die Kapazität des kapazitiven Messelementes zwischen der Außenelektrode 2 und der Innenelektrode 3 bestimmt werden, da der Kraftstoff auch in den Elektrodenspalt eindringt, und kann daraus die Art des Kraftstoffes bestimmt werden.When the sensor is in the fuel line 6 is built in, as is in 2 is shown, it dips into the fuel in the fuel line 6 one, such that the bulge 3a the inner electrode 3 is surrounded by fuel and the temperature element 1 quickly and accurately the temperature of the fuel in the fuel line 6 can determine. At the same time, the capacitance of the capacitive measuring element between the outer electrode 2 and the inner electrode 3 can be determined, since the fuel also penetrates into the electrode gap, and from this the type of fuel can be determined.

Die Elektroden 2, 3 des kapazitiven Messelementes sowie die Anschlüsse des Temperaturmesselementes 1 sind mit der elektronischen Schaltung 7 verbunden, die die entsprechenden von den Messelementen kommenden Signale verarbeitet bzw. an entsprechende Auswerteeinrichtungen weiterleitet.The electrodes 2 . 3 the capacitive measuring element and the terminals of the temperature measuring element 1 are with the electronic circuit 7 connected, which processes the corresponding signals coming from the measuring elements or forwards them to corresponding evaluation devices.

Claims (5)

Sensor zum Bestimmen des Kraftstoffes für einen Dieselmotor mit einem kapazitiven Messelement, in dessen Elektrodenspalt der zu bestimmende Kraftstoff eingeführt wird, gekennzeichnet durch ein Temperaturmesselement (1), das in das kapazitive Messelement integriert ist.Sensor for determining the fuel for a diesel engine with a capacitive measuring element, in the electrode gap of which the fuel to be determined is introduced, characterized by a temperature measuring element ( 1 ), which is integrated in the capacitive measuring element. Sensor nach Anspruch 1, dadurch gekennzeichnet, dass das Temperaturmesselement (1) in eine Elektrode (2, 3) des kapazitiven Messelementes eingebaut ist.Sensor according to claim 1, characterized in that the temperature measuring element ( 1 ) into an electrode ( 2 . 3 ) of the capacitive measuring element is installed. Sensor nach Anspruch 2, dadurch gekennzeichnet, dass das kapazitive Messelement ein Ringkondensator ist und das Temperaturmesselement (1) in die Innenelektrode (3) des Ringkondensators eingebaut ist.Sensor according to claim 2, characterized in that the capacitive measuring element is a ring capacitor and the temperature measuring element ( 1 ) into the inner electrode ( 3 ) of the ring capacitor is installed. Sensor nach Anspruch 3, dadurch gekennzeichnet, dass die Innenelektrode (3) des Ringkondensators an ihrer kraftstoffseitigen Stirnseite durch eine Stirnwand geschlossen ist, die eine in den Kraftstoffstrom vorstehende Ausbauchung (3a) aufweist, in der das Temperaturmesselement (1) angeordnet ist.Sensor according to claim 3, characterized in that the inner electrode ( 3 ) of the ring condenser is closed at its fuel-side end face by an end wall, which has a protruding into the fuel flow bulge ( 3a ), in which the temperature measuring element ( 1 ) is arranged. Sensor nach Anspruch 4, gekennzeichnet durch einen Träger (5), der passgenau im Inneren der Innenelektrode (3) angeordnet ist und an seiner Stirnseite das Temperaturmesselement (1) hält.Sensor according to claim 4, characterized by a carrier ( 5 ), which fits perfectly inside the inner electrode ( 3 ) is arranged and at its front side the temperature measuring element ( 1 ) holds.
DE2003131577 2003-07-11 2003-07-11 Sensor for determining the fuel for a diesel engine Expired - Fee Related DE10331577B4 (en)

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Application Number Priority Date Filing Date Title
DE2003131577 DE10331577B4 (en) 2003-07-11 2003-07-11 Sensor for determining the fuel for a diesel engine

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DE2003131577 DE10331577B4 (en) 2003-07-11 2003-07-11 Sensor for determining the fuel for a diesel engine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007019577A2 (en) * 2005-08-08 2007-02-15 Siemens Vdo Automotive Corporation Capacitive fluid quality sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030020494A1 (en) * 2001-05-17 2003-01-30 Isabelle Desmier Fuel sensor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10060419C2 (en) * 2000-12-05 2002-10-24 Beru Ag Method for detecting a fluid and sensor for performing this method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030020494A1 (en) * 2001-05-17 2003-01-30 Isabelle Desmier Fuel sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007019577A2 (en) * 2005-08-08 2007-02-15 Siemens Vdo Automotive Corporation Capacitive fluid quality sensor
WO2007019577A3 (en) * 2005-08-08 2007-04-12 Siemens Vdo Automotive Corp Capacitive fluid quality sensor
US7466147B2 (en) 2005-08-08 2008-12-16 Continental Automotive Systems Us, Inc. Fluid quality sensor

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Representative=s name: KOTITSCHKE & HEURUNG PARTNERSCHAFT MBB PATENT-, DE

Representative=s name: DR. RALF KOTITSCHKE, DE

Representative=s name: KOTITSCHKE & HEURUNG PARTNERSCHAFT MBB, DE

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee