EP0431208B1 - Method of measuring the quantity of petrol delivered by the hose of a petrol pump - Google Patents

Method of measuring the quantity of petrol delivered by the hose of a petrol pump Download PDF

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Publication number
EP0431208B1
EP0431208B1 EP89122447A EP89122447A EP0431208B1 EP 0431208 B1 EP0431208 B1 EP 0431208B1 EP 89122447 A EP89122447 A EP 89122447A EP 89122447 A EP89122447 A EP 89122447A EP 0431208 B1 EP0431208 B1 EP 0431208B1
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EP
European Patent Office
Prior art keywords
pulses
fuel
pump
delivered
petrol
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EP89122447A
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German (de)
French (fr)
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EP0431208A1 (en
Inventor
Erwin Dipl. Ing. Busch
Gerd Dipl. Ing. Baumann
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Scheidt and Bachmann GmbH
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Scheidt and Bachmann GmbH
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Application filed by Scheidt and Bachmann GmbH filed Critical Scheidt and Bachmann GmbH
Priority to AT89122447T priority Critical patent/ATE91271T1/en
Priority to EP89122447A priority patent/EP0431208B1/en
Priority to ES89122447T priority patent/ES2042948T3/en
Priority to DE8989122447T priority patent/DE58904881D1/en
Publication of EP0431208A1 publication Critical patent/EP0431208A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B67OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67DDISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/06Details or accessories
    • B67D7/08Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred
    • B67D7/22Arrangements of indicators or registers
    • B67D7/221Arrangements of indicators or registers using electrical or electro-mechanical means
    • B67D7/222Arrangements of indicators or registers using electrical or electro-mechanical means involving digital counting

Definitions

  • the invention relates to a method for measuring the amount of fuel dispensed through the dispensing hose of a dispensing point, in particular a lead-free liquid fuel for the operation of internal combustion engines, the fuel being conveyed from a storage container by means of a pump and via a measuring unit connected downstream of the pump in the fuel flow with a Dispensing valve provided dispensing hose is supplied and the pump is switched on when the dispensing valve is removed from its holder and the measuring mechanism generates pulses for measuring the quantity of fuel dispensed, which are used to determine both the quantity dispensed and the resulting price.
  • the complete liquid system including the dispensing hose is filled up to the dispensing valve.
  • the pump motor is switched on.
  • the fuel in the nozzle therefore escapes, the amount of fuel flowing through the measuring mechanism being determined with the aid of a pulse generator which is driven by the measuring mechanism, preferably a piston meter.
  • the dispensing hoses of the dispensing points currently on the market have a permeability which is particularly noticeable in the case of lead-free fuels, the knock resistance of which is improved by admixing additives, for example aromatics, in that a certain amount of fuel evaporates through the hose. Measurements have shown that this amount is about 10 cm3 per meter of hose length per 24 hours. This has the disadvantage, among other things, that after a long period of non-use of a tap at the start of a tap operation, a certain amount of fuel is pumped into the system between the measuring mechanism and the tap valve, ie in particular into the tap hose, before the actual tap process begins.
  • the invention has for its object to provide a method of the type described above for measuring the amount of fuel dispensed through the nozzle of a fuel dispenser, which easily avoids burdening the customer with such volatilization losses without constructive changes to the existing fuel dispenser construction.
  • the solution to this problem by the invention is characterized in that at the beginning of each dispensing process, a programmable number of pulses is monitored with regard to their time interval between successive pulses and is fed to a memory, and that the stored pulses are excluded from an evaluation when determining the amount of fuel dispensed if a programmable. within the programmed number of pulses Time interval between two successive pulses is exceeded, whereas the stored pulses are used to determine the amount of fuel output if such a time interval is not exceeded.
  • the method according to the invention determines whether a small amount of fuel passes the measuring mechanism before the actual dispensing operation; this small amount is a replenishment of the liquid system between the dispensing valve and the measuring mechanism due to volatilization losses due to the permeability of the dispensing hose. Since this small amount passes the measuring mechanism immediately after removing the nozzle from its holder, because the pump motor is switched on by removing the nozzle from its holder, a certain amount of time passes between the measurement of this loss and the actual dispensing process after each dispensing process Insertion of the nozzle valve takes place in the fuel tank to be filled.
  • the first pulses represent an amount of liquid which serves to fill up the volatilization losses.
  • the impulses of this first group are therefore not taken into account when determining the amount of fuel dispensed.
  • the pulse count at the start of a tap does not exceed a predetermined time between successive pulses, it can be assumed that all pulses are triggered by a normal tap.
  • the pulse number programmed according to the invention at the beginning of each dispensing process and monitored with regard to its time interval is consequently used in the determination the amount of fuel dispensed.
  • the method according to the invention does not require any design or apparatus changes to the existing tapping points, but can be carried out by programming the existing electronics. It can therefore be retrofitted to existing taps without major difficulties.
  • the time interval between successive pulses of the programmed number of pulses is monitored at the beginning of each tapping process by time circles, which are started each time a pulse occurs.
  • the programmable number of the pulses monitored at the beginning of each dispensing operation corresponds to a maximum amount of liquid of 200 cm 3.
  • such a limitation of the monitored pulses is sufficient to detect the liquid losses caused by the permeability of the dispensing hose.
  • the tap shown schematically in FIG. 1 shows a tap mast 1 in which a pipeline 2 is laid, at the upper end of which a tap hose 3 is connected.
  • This dispensing hose 3 is guided over two deflection rollers 4, which enable the dispensing hose 3 to be pulled out of the dispensing mast 1.
  • a dispensing valve 5 At the end of the dispensing hose 3 there is a dispensing valve 5 which is inserted into a holder 6 of the dispensing mast 1 when not in use.
  • This electric motor and thus the pump 8 are switched on as soon as the nozzle 5 is removed from its holder 6.
  • the holder 6 is provided with a switch which switches the pump motor on as soon as the nozzle 5 is removed from the holder 6.
  • the fuel delivered by the pump 8 is fed via a gas separator 9 and a check valve 10 to a measuring mechanism 11, which is preferably designed as a piston counter.
  • This measuring mechanism 11 is equipped with a pulse generator 12 which emits individual pulses in accordance with the rotary movement of the measuring mechanism 11 and thus the fuel quantity flowing through, which are used in an evaluation device (not shown in the drawing) to determine both the quantity delivered and the resulting price.
  • the amount and price of the amount of fuel dispensed are also shown to the customer on a display that is not shown.
  • the fluid system between the check valve 10 and the nozzle 5 is normally filled with fuel. Accordingly, in the idle state there is fuel both in the pipeline 2 and in the dispensing hose 3. Since this dispensing hose 3 has a certain permeability which results in the fuel evaporating, fuel losses due to volatilization occur in particular when the dispensing point is not used for a long time. Particularly in the case of lead-free fuels, the knock resistance of which is improved by adding additives, for example aromatics, there is a relatively large volatilization. This can be up to 10 cm3 per meter of hose length per 24 hours. With a length of the dispensing hose 3 of approximately 5 meters, considerable fuel losses result when the dispensing point is not used for a long time.
  • the pump 8 Since the pump 8 is switched on as soon as the dispensing valve 5 is removed from its holder 6, the fuel losses which occur due to volatilization are compensated for at the beginning of each dispensing operation by filling up the liquid system. This filling occurs before the actual dispensing process begins, since it is necessary to start the dispensing process by inserting the dispensing valve 5 into the fuel tank to be filled. Only then is the dispensing valve 5 opened by actuating the corresponding handle and the actual dispensing process initiated.
  • the pulse generator 12 Since the compensation of the fuel loss caused by the permeability of the dispensing hose 3 takes place by filling in particular the dispensing hose 3 and the pipeline 2, this amount of fuel passes through the measuring mechanism 11. Accordingly, during this filling, the pulse generator 12 emits pulses which are added to the pulses of the actual dispensing process .
  • FIG. 2 shows a pulse diagram which shows the switching on of the pump 8 at time a in the upper part. Shortly after this switching on, nine pulses I1 to I9 are found in the exemplary embodiment. These pulses correspond to the amount of fuel that serves to fill up the fuel loss due to the permeability of the nozzle 3. This amount of fuel consequently does not come to be dispensed through the dispensing valve 5, but only serves to properly fill the liquid system before the actual dispensing process.
  • a programmable number of pulses I is monitored with regard to the time interval between successive pulses and supplied to a memory. In the embodiment, this is the pulses I1 to I9. These pulses I1 to I9 are excluded from an assessment when determining the amount of fuel output if after the pulse I9 a programmable time interval is exceeded before the pulse I10 occurs. In the embodiment according to Fig.2 the time period t x is greater than the programmed time interval.
  • a time circuit is switched on, for example, by each of the first twenty pulses at the beginning of each dispensing operation, monitoring whether a next pulse follows within the time specified by switching on the time circuit.
  • the programmed time interval of the time circuit started with the pulse I9 would be exceeded before the next pulse I10 follows in the time segment t x .
  • the pulses I1 to I9 are not taken into account in the determination of the amount of fuel output, because it is obviously a replenishment of a fuel loss due to the permeability of the nozzle 3.
  • the programmable number of impulses monitored at the start of each dispensing operation corresponds approximately to a maximum amount of liquid of 200 cm3. If one pulse per 10 cm3 of liquid quantity conveyed by the measuring mechanism 11 is emitted by the pulse generator 12, the programmed number of monitored pulses is twenty. In practice, it has been found that the maximum time duration of the time circles used for monitoring, ie the monitored time interval between successive pulses, is approximately 10 msec. The monitoring of the programmable described above The number of impulses that occur first in each tapping process is therefore completed within a very short time.

Abstract

The invention relates to a method of measuring the quantity of petrol delivered by the hose (3) of a petrol pump (1), the petrol being conveyed by means of a pump (8) from a storage container and supplied via a measuring device (11) connected downstream of the pump (8) in the petrol flow, to the hose (3) provided with a dispensing nozzle (5). The pump (8) is switched on when the dispensing nozzle (5) is removed from its mounting (6). Impulses (I) are generated by the measuring device (11) to measure the quantity of petrol delivered, said impulses being used to determine both the quantity delivered and the resulting price. To avoid an incorrect allowance for fuel which escapes owing to the permeability of the hose (3) when the petrol pump (1) is not in use, at the beginning of each dispensing operation a programmable number of impulses (I) are monitored in respect of their time interval between successive impulses (I) and supplied to a store. The stored impulses (I) are excluded from an evaluation during determination of the quantity of petrol delivered if, within the programmed number of impulses (I), a programmable time interval between two successive impulses (I) is exceeded. The stored impulses (I) are used, in contrast, for determining the quantity of petrol delivered if there is no such exceeding of the time interval. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Messen der durch den Zapfschlauch einer Zapfstelle abgegebenen Menge eines Kraftstoffes, insbesondere eines bleifreien flüssigen Kraftstoffes zum Betrieb von Verbrennungsmotoren, wobei der Kraftstoff mittels einer Pumpe aus einem Vorratsbehälter gefördert und über ein der Pumpe im Kraftstofffluß nachgeschaltetes Meßwerk dem mit einem Zapfventil versehenen Zapfschlauch zugeführt wird und wobei die Pumpe beim Herausnehmen des Zapfventils aus seiner Halterung eingeschaltet und durch das Meßwerk Impulse zur Messung der abgegebenen Kraftstoffmenge erzeugt werden, die zur Ermittlung sowohl der abgegebenen Menge als auch des sich hieraus ergebenden Preises herangezogen werden.The invention relates to a method for measuring the amount of fuel dispensed through the dispensing hose of a dispensing point, in particular a lead-free liquid fuel for the operation of internal combustion engines, the fuel being conveyed from a storage container by means of a pump and via a measuring unit connected downstream of the pump in the fuel flow with a Dispensing valve provided dispensing hose is supplied and the pump is switched on when the dispensing valve is removed from its holder and the measuring mechanism generates pulses for measuring the quantity of fuel dispensed, which are used to determine both the quantity dispensed and the resulting price.

Bei den derzeit auf dem Markt befindlichen Zapfstellen ist das komplette Flüssigkeitssystem einschließlich des Zapfschlauches bis zum Zapfventil gefüllt. Beim Herausnehmen des Zapfventils aus seiner Halterung wird der Pumpenmotor eingeschaltet. Unmittelbar nach dem Öffnen des Zapfventils tritt demzufolge der im Zapfschlauch befindliche Kraftstoff aus, wobei die durch das Meßwerk fließende Kraftstoffmenge mit Hilfe eines Impulsgebers ermittelt wird, der vom Meßwerk, vorzugsweise einem Kolbenmesser, angetrieben wird. Diese Impulse werden mittels eines Rechners zur Ermittlung und Anzeige der abgegebenen Menge und des sich hieraus ergebenden Preises verarbeitet.At the tapping points currently on the market, the complete liquid system including the dispensing hose is filled up to the dispensing valve. When the nozzle is removed from its holder, the pump motor is switched on. Immediately after the nozzle is opened, the fuel in the nozzle therefore escapes, the amount of fuel flowing through the measuring mechanism being determined with the aid of a pulse generator which is driven by the measuring mechanism, preferably a piston meter. These impulses are processed by a computer to determine and display the quantity delivered and the resulting price.

Die Zapfschläuche der derzeit auf dem Markt befindlichen Zapfstellen haben eine Permeabilität, die sich insbesondere bei bleifreien Kraftstoffen, deren Klopffestigkeit durch Beimischung von Zusatzstoffen, beispielsweise Aromaten, verbessert wird, dadurch bemerkbar macht, daß eine gewisse Kraftstoffmenge sich durch den Schlauch hindurch verflüchtigt. Messungen haben ergeben, daß diese Menge etwa 10 cm³ pro Meter Schlauchlänge pro 24 Stunden beträgt. Hierdurch ergibt sich unter anderem der Nachteil, daß nach längerer Nichtbenutzung einer Zapfstelle zu Beginn eines Zapfvorganges eine gewisse Kraftstoffmenge von der Pumpe in das System zwischen Meßwerk und Zapfventil, d.h. insbesondere in den Zapfschlauch gefördert wird, bevor der eigentliche Zapfvorgang beginnt. Diese zur Auffüllung der infolge der Permeabilität des Zapfschlauches verflüchtigten Kraftstoffmenge wird bei den bekannten Meßverfahren erfaßt und dem Kunden in Rechnung gestellt. Bei einer Zapfschlauchlänge von bis zu 5 Metern können derartige Verflüchtigungsverluste bis zu einem viertel Liter betragen.The dispensing hoses of the dispensing points currently on the market have a permeability which is particularly noticeable in the case of lead-free fuels, the knock resistance of which is improved by admixing additives, for example aromatics, in that a certain amount of fuel evaporates through the hose. Measurements have shown that this amount is about 10 cm³ per meter of hose length per 24 hours. This has the disadvantage, among other things, that after a long period of non-use of a tap at the start of a tap operation, a certain amount of fuel is pumped into the system between the measuring mechanism and the tap valve, ie in particular into the tap hose, before the actual tap process begins. This quantity of fuel that is volatilized as a result of the permeability of the nozzle is recorded in the known measuring methods and billed to the customer. With a dispensing hose length of up to 5 meters, such volatilization losses can be up to a quarter of a liter.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art zum Messen der durch den Zapfschlauch einer Zapfstelle abgegebenen Menge eines Kraftstoffes zu schaffen, das eine Belastung des Kunden mit derartigen Verflüchtigungsverlusten ohne konstruktive Änderungen der vorhandenen Zapfstellenkonstruktion auf einfache Weise vermeidet.The invention has for its object to provide a method of the type described above for measuring the amount of fuel dispensed through the nozzle of a fuel dispenser, which easily avoids burdening the customer with such volatilization losses without constructive changes to the existing fuel dispenser construction.

Die Lösung dieser Aufgabenstellung durch die Erfindung ist dadurch gekennzeichnet, daß zu Beginn jedes Zapfvorganges eine programmierbare Anzahl von Impulsen hinsichtlich ihres zeitlichen Abstandes zwischen aufeinanderfolgenden Impulsen überwacht und einem Speicher zugeführt wird und daß die gespeicherten Impulse von einer Bewertung bei der Ermittlung der ausgegebenen Kraftstoffmenge ausgeschlossen werden, wenn innerhalb der programmierten Anzahl der Impulse ein programmierbarer Zeitabstand zwischen zwei aufeinanderfolgenden Impulsen überschritten wird, wogegen die gespeicherten Impulse für die Ermittlung der ausgegebenen Kraftstoffmenge herangezogen werden, wenn eine derartige Überschreitung des Zeitabstandes unterbleibt.The solution to this problem by the invention is characterized in that at the beginning of each dispensing process, a programmable number of pulses is monitored with regard to their time interval between successive pulses and is fed to a memory, and that the stored pulses are excluded from an evaluation when determining the amount of fuel dispensed if a programmable. within the programmed number of pulses Time interval between two successive pulses is exceeded, whereas the stored pulses are used to determine the amount of fuel output if such a time interval is not exceeded.

Das jeweils nur zu Beginn jedes Zapfvorganges durchgeführte Verfahren nach der Erfindung stellt fest, ob vor dem eigentlichen Zapfvorgang eine geringe Kraftstoffmenge das Meßwerk passiert; bei dieser geringen Menge handelt es sich um eine Auffüllung des Flüssigkeitssystems zwischen Zapfventil und Meßwerk aufgrund von Verflüchtigungsverlusten infolge der Permeabilität des Zapfschlauches. Da diese geringe Menge das Meßwerk unmittelbar nach Entnahme des Zapfventils aus seiner Halterung passiert, weil durch diese Entnahme des Zapfventils aus seiner Halterung der Pumpenmotor eingeschaltet wird, vergeht bei jedem Zapfvorgang eine gewisse Zeit zwischen der Messung dieser Verlustmenge und dem eigentlichen Zapfvorgang, der erst nach Einführen des Zapfventils in den jeweils aufzufüllenden Kraftstoffbehälter stattfindet. Wenn mit dem erfindungsgemäßen Verfahren somit festgestellt wird, daß zu Beginn eines jeden Zapfvorganges nach einer ersten Impulsgruppe eine bestimmte Zeit überschritten wird bis weitere Impulse kommen, repräsentieren die ersten Impulse eine Flüssigkeitsmenge, die der Auffüllung der Verflüchtigungsverluste dient. Die Impulse dieser ersten Gruppe werden demzufolge bei der Ermittlung der verzapften Kraftstoffmenge nicht berücksichtigt. Ergibt sich bei der Impulszählung zu Beginn eines Zapfvorganges dagegen keine Überschreitung einer vorbestimmten Zeit zwischen aufeinanderfolgenden Impulsen, kann davon ausgegangen werden, daß sämtliche Impulse durch einen normalen Zapfvorgang ausgelöst werden. Die erfindungsgemäß zu Beginn jedes Zapfvorganges programmierte und hinsichtlich ihres zeitlichen Abstandes überwachte Impulszahl wird demzufolge bei der Ermittlung der ausgegebenen Kraftstoffmenge berücksichtigt.The method according to the invention, which is only carried out at the beginning of each dispensing operation, determines whether a small amount of fuel passes the measuring mechanism before the actual dispensing operation; this small amount is a replenishment of the liquid system between the dispensing valve and the measuring mechanism due to volatilization losses due to the permeability of the dispensing hose. Since this small amount passes the measuring mechanism immediately after removing the nozzle from its holder, because the pump motor is switched on by removing the nozzle from its holder, a certain amount of time passes between the measurement of this loss and the actual dispensing process after each dispensing process Insertion of the nozzle valve takes place in the fuel tank to be filled. If it is thus determined with the method according to the invention that at the beginning of each dispensing process after a first pulse group a certain time is exceeded until further pulses come, the first pulses represent an amount of liquid which serves to fill up the volatilization losses. The impulses of this first group are therefore not taken into account when determining the amount of fuel dispensed. On the other hand, if the pulse count at the start of a tap does not exceed a predetermined time between successive pulses, it can be assumed that all pulses are triggered by a normal tap. The pulse number programmed according to the invention at the beginning of each dispensing process and monitored with regard to its time interval is consequently used in the determination the amount of fuel dispensed.

Das erfindungsgemäße Verfahren erfordert keine konstruktive oder apparative Änderung der bestehenden Zapfstellen, sondern kann durch Programmierung der vorhandenen Elektronik durchgeführt werden. Es ist demzufolge ohne größere Schwierigkeiten an vorhandenen Zapfstellen nachrüstbar.The method according to the invention does not require any design or apparatus changes to the existing tapping points, but can be carried out by programming the existing electronics. It can therefore be retrofitted to existing taps without major difficulties.

Gemäß einem weiteren Merkmal der Erfindung erfolgt die Überwachung des zeitlichen Abstandes zwischen aufeinanderfolgenden Impulsen der programmierten Impulsanzahl zu Beginn jedes Zapfvorganges durch Zeitkreise, die bei Auftreten jeweils eines Impulses gestartet werden.According to a further feature of the invention, the time interval between successive pulses of the programmed number of pulses is monitored at the beginning of each tapping process by time circles, which are started each time a pulse occurs.

Die programmierbare Anzahl der zu Beginn eines jeden Zapfvorganges überwachten Impulse entspricht erfindungsgemäß einer Flüssigkeitsmenge von maximal 200 cm³. Eine derartige Beschränkung der überwachten Impulse reicht in der Praxis aus, um die durch Permeabilität des Zapfschlauches bedingten Flüssigkeitsverluste zu erfassen.According to the invention, the programmable number of the pulses monitored at the beginning of each dispensing operation corresponds to a maximum amount of liquid of 200 cm 3. In practice, such a limitation of the monitored pulses is sufficient to detect the liquid losses caused by the permeability of the dispensing hose.

Mit der Erfindung wird schließlich vorgeschlagen, bei einer Anwendung des erfindungsgemäßen Verfahrens an vorhandenen Zapfstellen die hinsichtlich ihres zeitlichen Abstandes überwachte Impulse auf etwa 20 und die maximale Zeitdauer der zur Überwachung verwendeten Zeitkreise auf etwa 100 msec festzulegen. Diese geringe Anzahl und geringe Zeitspanne reicht aus, die erforderliche Überwachung ordnungsgemäß durchzuführen.Finally, it is proposed with the invention, when using the method according to the invention, to fix the pulses monitored with regard to their time interval to approximately 20 and the maximum duration of the time circles used for monitoring to approximately 100 msec at existing tapping points. This small number and short time span is sufficient to carry out the required monitoring properly.

Auf der Zeichnung ist in

Fig. 1
schematisch eine Zapfstelle zur Ausgabe flüssiger Kraftstoffe mit den hierfür erforderlichen Bauteilen und in
Fig. 2
ein Impulsschema dargestellt, anhand dessen das erfindungsgemäße Verfahren erläutert werden wird.
On the drawing is in
Fig. 1
schematically a tap for dispensing liquid fuels with the necessary components and in
Fig. 2
a pulse diagram is shown, based on which the inventive method will be explained.

Die in Fig.1 schematisch dargestellte Zapfstelle zeigt einen Zapfmast 1, in dem eine Rohrleitung 2 verlegt ist, an deren oberes Ende ein Zapfschlauch 3 angeschlossen ist. Dieser Zapfschlauch 3 ist über zwei Umlenkrollen 4 geführt, die ein Ausziehen des Zapfschlauches 3 aus dem Zapfmast 1 ermöglichen. Am Ende des Zapfschlauches 3 ist ein Zapfventil 5 angeordnet, das bei Nichtgebrauch in eine Halterung 6 des Zapfmastes 1 eingesetzt wird.The tap shown schematically in FIG. 1 shows a tap mast 1 in which a pipeline 2 is laid, at the upper end of which a tap hose 3 is connected. This dispensing hose 3 is guided over two deflection rollers 4, which enable the dispensing hose 3 to be pulled out of the dispensing mast 1. At the end of the dispensing hose 3 there is a dispensing valve 5 which is inserted into a holder 6 of the dispensing mast 1 when not in use.

Der durch das Zapfventil 5 auszugebende Kraftstoff, vorzugsweise ein bleifreier flüssiger Kraftstoff für Verbrennungsmotoren, wird aus einem nicht dargestellten Vorratsbehälter über einen Filter 7 von einer Pumpe 8 angesaugt, die von einem nicht dargestellten Elektromotor angetrieben wird. Dieser Elektromotor und damit die Pumpe 8 werden eingeschaltet, sobald das Zapfventil 5 aus seiner Halterung 6 herausgenommen wird. Zu diesem Zweck ist die Halterung 6 mit einem Schalter versehen, der unmittelbar den Pumpenmotor einschaltet, sobald das Zapfventil 5 aus der Halterung 6 entnommen wird.The fuel to be dispensed through the nozzle 5, preferably a lead-free liquid fuel for internal combustion engines, is drawn in from a storage tank (not shown) via a filter 7 by a pump 8 which is driven by an electric motor (not shown). This electric motor and thus the pump 8 are switched on as soon as the nozzle 5 is removed from its holder 6. For this purpose, the holder 6 is provided with a switch which switches the pump motor on as soon as the nozzle 5 is removed from the holder 6.

Der von der Pumpe 8 geförderte Kraftstoff wird über einen Gasabscheider 9 und ein Rückschlagventil 10 einem Meßwerk 11 zugeführt, das vorzugsweise als Kolbenzähler ausgebildet ist. Dieses Meßwerk 11 ist mit einem Impulsgeber 12 ausgestattet, der entsprechend der Drehbewegung des Meßwerkes 11 und damit der durchfließenden Kraftstoffmenge Einzelimpulse abgibt, die in einer auf der Zeichnung nicht dargestellten Auswerteeinrichtung zur Ermittlung sowohl der abgegebenen Menge als auch des sich hieraus ergebenden Preises herangezogen werden. Menge und Preis der jeweils ausgegebenen Kraftstoffmenge werden darüber hinaus auf einer nicht dargestellten Anzeige dem Kunden angezeigt.The fuel delivered by the pump 8 is fed via a gas separator 9 and a check valve 10 to a measuring mechanism 11, which is preferably designed as a piston counter. This measuring mechanism 11 is equipped with a pulse generator 12 which emits individual pulses in accordance with the rotary movement of the measuring mechanism 11 and thus the fuel quantity flowing through, which are used in an evaluation device (not shown in the drawing) to determine both the quantity delivered and the resulting price. The amount and price of the amount of fuel dispensed are also shown to the customer on a display that is not shown.

Das Flüssigkeitssystem zwischen dem Rückschlagventil 10 und dem Zapfventil 5 ist normalerweise mit Kraftstoff gefüllt. Im Ruhezustand befindet sich demzufolge Kraftstoff sowohl in der Rohrleitung 2 als auch im Zapfschlauch 3. Da dieser Zapfschlauch 3 eine gewisse Permeabilität aufweist, die eine Verflüchtigung des Kraftstoffes zur Folge hat, treten insbesondere bei längerem Nichtgebrauch der Zapfstelle Kraftstoffverluste durch Verflüchtigung auf. Insbesondere bei bleifreien Kraftstoffen, deren Klopffestigkeit durch Beimischung von Zusatzstoffen, beispielsweise Aromaten, verbessert wird, ergibt sich eine verhältnismäßig große Verflüchtigung. Diese kann bis zu 10 cm³ je Meter Schlauchlänge pro 24 Stunden betragen. Bei einer Länge des Zapfschlauches 3 von etwa 5 Metern ergeben sich somit bei längerer Nichtbenutzung der Zapfstelle durchaus beachtliche Kraftstoffverluste.The fluid system between the check valve 10 and the nozzle 5 is normally filled with fuel. Accordingly, in the idle state there is fuel both in the pipeline 2 and in the dispensing hose 3. Since this dispensing hose 3 has a certain permeability which results in the fuel evaporating, fuel losses due to volatilization occur in particular when the dispensing point is not used for a long time. Particularly in the case of lead-free fuels, the knock resistance of which is improved by adding additives, for example aromatics, there is a relatively large volatilization. This can be up to 10 cm³ per meter of hose length per 24 hours. With a length of the dispensing hose 3 of approximately 5 meters, considerable fuel losses result when the dispensing point is not used for a long time.

Da die Pumpe 8 unmittelbar bei Entnahme des Zapfventiles 5 aus seiner Halterung 6 eingeschaltet wird, werden diese durch Verflüchtigung auftretenden Kraftstoffverluste zu Beginn jedes Zapfvorganges durch Auffüllen des Flüssigkeitssystems ausgeglichen. Dieses Auffüllen geschieht bevor der eigentliche Zapfvorgang beginnt, da es für den Start dieses Zapfvorganges erforderlich ist, das Zapfventil 5 in den jeweils zu befüllenden Kraftstoffbehälter einzusetzen. Erst danach wird das Zapfventil 5 durch Betätigen des entsprechenden Handgriffes geöffnet und der eigentliche Zapfvorgang eingeleitet werden.Since the pump 8 is switched on as soon as the dispensing valve 5 is removed from its holder 6, the fuel losses which occur due to volatilization are compensated for at the beginning of each dispensing operation by filling up the liquid system. This filling occurs before the actual dispensing process begins, since it is necessary to start the dispensing process by inserting the dispensing valve 5 into the fuel tank to be filled. Only then is the dispensing valve 5 opened by actuating the corresponding handle and the actual dispensing process initiated.

Da der Ausgleich des durch die Permeabilität des Zapfschlauches 3 entstehenden Kraftstoffverlustes durch Auffüllen insbesondere des Zapfschlauches 3 und der Rohrleitung 2 erfolgt, passiert diese Kraftstoffmenge das Meßwerk 11. Demzufolge werden bei diesem Auffüllen vom Impulsgeber 12 Impulse ausgesandt, die den Impulsen des eigentlichen Zapfvorganges hinzuaddiert werden.Since the compensation of the fuel loss caused by the permeability of the dispensing hose 3 takes place by filling in particular the dispensing hose 3 and the pipeline 2, this amount of fuel passes through the measuring mechanism 11. Accordingly, during this filling, the pulse generator 12 emits pulses which are added to the pulses of the actual dispensing process .

In Fig.2 ist ein Impulsdiagramm dargestellt, welches im oberen Teil das Einschalten der Pumpe 8 zum Zeitpunkt a zeigt. Kurz nach diesem Einschalten werden beim Ausführungsbeispiel neun Impulse I₁ bis I₉ festgestellt. Diese Impulse entsprechen derjenigen Kraftstoffmenge, die der Auffüllung des Kraftstoffverlustes infolge der Permeabilität des Zapfschlauches 3 dient. Diese Kraftstoffmenge kommt demzufolge nicht zur Ausgabe durch das Zapfventil 5, sondern dient lediglich der ordnungsgemäßen Füllung des Flüssigkeitssystems vor dem eigentlichen Zapfvorgang.2 shows a pulse diagram which shows the switching on of the pump 8 at time a in the upper part. Shortly after this switching on, nine pulses I₁ to I₉ are found in the exemplary embodiment. These pulses correspond to the amount of fuel that serves to fill up the fuel loss due to the permeability of the nozzle 3. This amount of fuel consequently does not come to be dispensed through the dispensing valve 5, but only serves to properly fill the liquid system before the actual dispensing process.

Wie aus Fig.2 weiter hervorgeht, vergeht nach dem letzten Impuls I₉ eine Zeitspanne tx, bevor der erste Impuls I₁₀ des eigentlichen Zapfvorganges folgt. Die Zeitspanne zwischen der Entnahme des Zapfventils 5 aus der Halterung 6 zum Zeitpunkt a und dem Auftreten des Impulses I₁₀ zu Beginn des eigentlichen Zapfvorganges entspricht derjenigen Zeit, welche vergeht, bis der Benutzer das aus der Halterung 6 entnommene Zapfventil 5 in den zu befüllenden Kraftstoffbehälter eingeführt und das Zapfventil 5 durch Betätigen der entsprechenden Handhabe geöffnet hat.As can further be seen from FIG. 2, after the last pulse I₉ there is a period of time t x before the first pulse I₁₀ of the actual dispensing process follows. The time between the removal of the nozzle 5 from the holder 6 at time a and the occurrence of the pulse I₁₀ at the beginning of the actual dispensing process corresponds to the time which elapses until the user inserts the nozzle 5 removed from the holder 6 into the fuel tank to be filled and has opened the nozzle 5 by actuating the corresponding handle.

Um eine fehlerhafte Berücksichtigung der durch die Impulse I₁ bis I₉ repräsentierten Kraftstoffmenge bei der Ermittlung der durch den eigentlichen Zapfvorgang abgegebenen Menge zu vermeiden, wird zu Beginn jedes Zapfvorganges eine programmierbare Anzahl von Impulsen I hinsichtlich ihres zeitlichen Abstandes zwischen aufeinanderfolgenden Impulsen überwacht und einem Speicher zugeführt. Beim Ausführungsbeispiel handelt es sich hierbei um die Impulse I₁ bis I₉. Diese Impulse I₁ bis I₉ werden von einer Bewertung bei der Ermittlung der ausgegebenen Kraftstoffmenge ausgeschlossen, wenn nach dem Impuls I₉ ein programmierbarer Zeitabstand überschritten wird, bevor der Impuls I₁₀ auftritt. Beim Ausführungsbeispiel nach Fig.2 ist die Zeitspanne tx größer als der programmierte Zeitabstand. Um ein Überschreiten eines derart programmierten Zeitabstandes festzustellen, wird beispielsweise durch jeden der ersten zwanzig Impulse zu Beginn jedes Zapfvorganges ein Zeitkreis eingeschaltet, wobei überwacht wird, ob innerhalb der durch Einschalten des Zeitkreises gestarteten Zeitvorgabe ein nächster Impuls folgt. Beim Ausführungsbeispiel nach Fig.2 würde der programmierte Zeitabstand des mit dem Impuls I₉ gestarteten Zeitkreises überschritten, bevor im Zeitabschnitt tx der nächste Impuls I₁₀ folgt. In diesem Fall werden die Impulse I₁ bis I₉ bei der Ermittlung der ausgegebenen Kraftstoffmenge nicht berücksichtigt, weil es sich offensichtlich um eine Auffüllung eines Kraftstoffverlustes infolge Permeabilität des Zapfschlauches 3 handelt.In order to avoid incorrect consideration of the fuel quantity represented by the pulses I₁ to I₉ when determining the amount dispensed by the actual dispensing process, at the beginning of each dispensing process a programmable number of pulses I is monitored with regard to the time interval between successive pulses and supplied to a memory. In the embodiment, this is the pulses I₁ to I₉. These pulses I₁ to I₉ are excluded from an assessment when determining the amount of fuel output if after the pulse I₉ a programmable time interval is exceeded before the pulse I₁₀ occurs. In the embodiment according to Fig.2 the time period t x is greater than the programmed time interval. In order to determine whether a time interval programmed in this way has been exceeded, a time circuit is switched on, for example, by each of the first twenty pulses at the beginning of each dispensing operation, monitoring whether a next pulse follows within the time specified by switching on the time circuit. In the exemplary embodiment according to FIG. 2, the programmed time interval of the time circuit started with the pulse I₉ would be exceeded before the next pulse I₁₀ follows in the time segment t x . In this case, the pulses I₁ to I₉ are not taken into account in the determination of the amount of fuel output, because it is obviously a replenishment of a fuel loss due to the permeability of the nozzle 3.

Wird dagegen innerhalb der programmierten Anzahl der ersten Impulse jedes Zapfvorganges keine Überschreitung des programmierten Zeitabstandes zwischen aufeinanderfolgenden Impulsen festgestellt, ist davon auszugehen, daß sämtliche vom Impulsgeber 12 erzeugten Impulse zum eigentlichen Zapfvorgang gehören. In diesem Fall werden die hinsichtlich ihrer Zeitfolge überwachten und gespeicherten Impulse bei der Ermittlung der ausgegebenen Kraftstoffmenge berücksichtigt.If, on the other hand, within the programmed number of the first pulses of each tapping process, the programmed time interval between successive pulses is not exceeded, it can be assumed that all the pulses generated by the pulse generator 12 belong to the actual tapping process. In this case, the pulses monitored and stored with regard to their time sequence are taken into account when determining the amount of fuel output.

Die programmierbare Anzahl der zu Beginn eines jeden Zapfvorganges überwachten Impulse entspricht etwa einer Flüssigkeitsmenge von maximal 200 cm³. Sofern durch den Impulsgeber 12 jeweils ein Impuls pro 10 cm³ vom Meßwerk 11 geförderter Flüssigkeitsmenge abgegeben wird, beträgt die programmierte Anzahl der überwachten Impulse zwanzig. In der Praxis hat sich herausgestellt, daß die maximale Zeitdauer der zur Überwachung verwendeten Zeitkreise, d.h. der überwachte Zeitabstand zwischen aufeinanderfolgenden Impulsen bei etwa 10 msec liegt. Die voranstehend beschriebene Überwachung der programmierbaren Anzahl der bei jedem Zapfvorgang als erstes auftretenden Impulse ist demzufolge innerhalb kürzester Zeit abgeschlossen.The programmable number of impulses monitored at the start of each dispensing operation corresponds approximately to a maximum amount of liquid of 200 cm³. If one pulse per 10 cm³ of liquid quantity conveyed by the measuring mechanism 11 is emitted by the pulse generator 12, the programmed number of monitored pulses is twenty. In practice, it has been found that the maximum time duration of the time circles used for monitoring, ie the monitored time interval between successive pulses, is approximately 10 msec. The monitoring of the programmable described above The number of impulses that occur first in each tapping process is therefore completed within a very short time.

Claims (4)

  1. Method of measuring the amount of a fuel, particularly a lead-free liquid fuel for operating internal combustion engines, delivered by the pump hose (3) of a delivery pump unit, wherein the fuel is delivered by means of a pump (8) from a storage tank and passed via a meter (11) disposed downstream of the pump (8) in the fuel flow to the pump hose (3) which is provided with a delivery valve (5), and wherein on the removal of the delivery valve (5) from its holder (6) the pump (8) is switched on and pulses (I) are generated by the meter (11) to measure the amount of fuel delivered and are utilised to determine both the amount delivered and the price resulting therefrom, characterised in that on the commencement of each delivery operation a programmable number of pulses (I) is monitored in respect of the time spacing between successive pulses (I) and is transmitted to a memory, and in that the stored pulses (I) are excluded from the calculation determining the amount of fuel delivered if, within the programmed number of pulses (I), a programmable space of time between two successive pulses (I) is exceeded, whereas the stored pulses (I) are utilised for determining the amount of fuel delivered if said space of time is not thus exceeded.
  2. Method according to Claim 1, characterised in that the time spacing between successive pulses (I) of the programmed number of pulses is monitored on the commencement of each delivery operation by means of timing circuits which are started upon occurrence of a respective pulse (I).
  3. Method according to Claim 1 or 2, characterised in that the programmable number of pulses (I) monitored on commencement of each delivery operation corresponds to an amount of liquid of a maximum of 200 cm³.
  4. Method according to one of Claims 1 to 3 for application to existing delivery pump units, characterised in that the number of pulses (I) monitored in respect of their time spacing is about 20 and the maximum time duration of the timing circuits used for monitoring is about 100 msec.
EP89122447A 1989-12-05 1989-12-05 Method of measuring the quantity of petrol delivered by the hose of a petrol pump Expired - Lifetime EP0431208B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT89122447T ATE91271T1 (en) 1989-12-05 1989-12-05 METHOD OF MEASURING THE QUANTITY OF A FUEL DELIVERED THROUGH A FEEDER HOSE AT A FEEDING STATION.
EP89122447A EP0431208B1 (en) 1989-12-05 1989-12-05 Method of measuring the quantity of petrol delivered by the hose of a petrol pump
ES89122447T ES2042948T3 (en) 1989-12-05 1989-12-05 PROCEDURE FOR THE MEDIATION OF THE AMOUNT OF FUEL SUPPLIED BY THE HOSE OF A JET POST.
DE8989122447T DE58904881D1 (en) 1989-12-05 1989-12-05 METHOD FOR MEASURING THE QUANTITY OF FUEL DELIVERED THROUGH THE TAP HOSE OF A TAP POINT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89122447A EP0431208B1 (en) 1989-12-05 1989-12-05 Method of measuring the quantity of petrol delivered by the hose of a petrol pump

Publications (2)

Publication Number Publication Date
EP0431208A1 EP0431208A1 (en) 1991-06-12
EP0431208B1 true EP0431208B1 (en) 1993-07-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122447A Expired - Lifetime EP0431208B1 (en) 1989-12-05 1989-12-05 Method of measuring the quantity of petrol delivered by the hose of a petrol pump

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EP (1) EP0431208B1 (en)
AT (1) ATE91271T1 (en)
DE (1) DE58904881D1 (en)
ES (1) ES2042948T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1000899B1 (en) * 1998-10-30 2003-08-27 Scheidt & Bachmann Gmbh Method of measuring the quantity of petrol delivered by the hose of a petrol pump

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL277653A (en) * 1961-04-26 1900-01-01
US3543008A (en) * 1968-05-22 1970-11-24 Veeder Industries Inc Pulse generating device
US3772916A (en) * 1971-12-08 1973-11-20 Bennett Pump Inc Variable increment transducer for fluid flow metering systems

Also Published As

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ES2042948T3 (en) 1993-12-16
ATE91271T1 (en) 1993-07-15
EP0431208A1 (en) 1991-06-12
DE58904881D1 (en) 1993-08-12

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