EP2072820B1 - Procédé destiné à l'analyse du fonctionnement d'une pompe de dosage pour liquides, notamment d'une pompe de dosage de carburant pour un appareil de chauffage pour véhicule - Google Patents

Procédé destiné à l'analyse du fonctionnement d'une pompe de dosage pour liquides, notamment d'une pompe de dosage de carburant pour un appareil de chauffage pour véhicule Download PDF

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Publication number
EP2072820B1
EP2072820B1 EP08018650A EP08018650A EP2072820B1 EP 2072820 B1 EP2072820 B1 EP 2072820B1 EP 08018650 A EP08018650 A EP 08018650A EP 08018650 A EP08018650 A EP 08018650A EP 2072820 B1 EP2072820 B1 EP 2072820B1
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EP
European Patent Office
Prior art keywords
analysis
parameter
piston
time
recognized
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.)
Not-in-force
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EP08018650A
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German (de)
English (en)
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EP2072820A1 (fr
EP2072820A8 (fr
Inventor
Stefan Bächner
Erwin Burner
Johannes Eger
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
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J Eberspaecher GmbH and Co KG
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Publication of EP2072820A1 publication Critical patent/EP2072820A1/fr
Publication of EP2072820A8 publication Critical patent/EP2072820A8/fr
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Publication of EP2072820B1 publication Critical patent/EP2072820B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow

Definitions

  • the present invention relates to a method for analyzing the operation of a metering pump for liquid, in particular Brennstoffdosierpumpe for a vehicle heater, which metering a clocked between two end positions reciprocating piston and an associated thereto, by applying a voltage during energization time intervals in respective working strokes of the piston electrically excitable drive unit comprises.
  • a method for operating a metering pump according to the preamble of claim 1 is known.
  • a metering pump is basically operated by a reciprocating piston for conveying liquid by an electrically energizable drive unit is moved from a first end position to a second end position, including during a energization time interval to the electrically excitable drive unit, a voltage in the form a clocked voltage signal is applied.
  • a pulse width modulated voltage results in an example represented by forming the arithmetic mean voltage, which essentially determines how fast the piston moves from its first end position to the second end position, so for example to minimize the volume of a Pump chamber is moved.
  • the time of reaching the second end position is a predetermined time after the beginning of a respective energization time interval or after the beginning of the movement Piston should lie.
  • this second end position is reached too early or too late can be adjusted by varying the voltage applied to the drive unit, ie by varying the duty cycle of the pulsed voltage, the average applied voltage and thus trying to the time at which the second end position , That is, the stop position, is reached, to move so that it is at or near the predetermined and to be considered as a reference target time.
  • this object is achieved by a method for analyzing the operation of a metering pump for liquid, in particular Brennstoffdosierpumpe for a vehicle heater, which metering a clocked between two end positions reciprocating piston and associated with this, by applying a voltage during energization time intervals in each of the working cycles of According to claim 1.
  • the method comprises the steps of: determining a start time of movement of the piston as a first analysis quantity and determining an end time of movement of the piston as a second analysis quantity, comparing at least one analysis variable with a reference associated therewith, and based on on the result of the comparison, detection of the presence of a fault condition if the analysis variable deviates from the reference.
  • a reference time point to be considered as a reference does not correspond to the respective analysis value or the analysis variable deviates from such a time point by a predetermined extent or not within a time window defined at such time.
  • the first analysis variable is only determined if, in one or more preceding work files, the comparison of the second analysis variable with its associated reference indicates the presence of a fault condition.
  • This procedure is based on the knowledge that a second analysis variable can only occur if the piston has started to move, ie if a first analysis variable would also be available. Since, if there is a second analysis variable for evaluation, the respectively assigned first analysis variable does not necessarily have to be evaluated, it can be dispensed with, which reduces the processing outlay.
  • the error state that is used as the trigger for subsequently determining also the first analysis variable for following work cycles is a state in which no second analysis variable was detected in an energization time interval.
  • the second analysis variable is in an excitation time interval before or after the reference assigned to it, the second analysis parameter is attempted in at least one subsequent working cycle by varying the excitation voltage for the drive unit Reference, and that when a variation of the excitation voltage does not lead to a sufficient shift of the second analysis size, is detected on the presence of a fault condition.
  • it may be first attempted to generate an indication indicative of the presence of an error condition or to avoid information. Only when it becomes apparent that a variation of the excitation voltage does not lead to the desired result, is then detected on the presence of a fault condition.
  • the first analysis variable be formed by forming the first time derivative of the electrical current flowing in an energization time interval and comparing it to an associated first threshold is determined.
  • the second analysis variable is determined by forming the second time derivative of the electrical current flowing in an energization time interval and comparing it with an associated second threshold.
  • Fig. 1 is a fuel heater to be operated with liquid fuel, such as can be used for example as a heater or heater in a vehicle, generally designated 10.
  • the heating device 10 comprises a burner region 12 with a combustion chamber 16 formed in a housing 14. Combustion air is conducted into the combustion chamber 16 via a combustion air blower 18.
  • a metering pump 20 conveys the fuel required for combustion with the combustion air in liquid form from a reservoir 22 to the combustion chamber 16, where, for example, a porous evaporator medium can take up this fuel and deliver it into the combustion chamber 16 in vapor form.
  • a drive device 24 controls the operation of the heater 10 by generating corresponding excitation signals for the combustion air blower 18 and the metering pump 20 or other system areas not shown here, such as an ignition device or an electrically energizable heating element serving to heat an evaporator medium.
  • the metering pump 20 is in principle constructed with a piston 26 which is in a cylinder 28 between an end position with maximum volume of a pump chamber 30 and an end position with minimum volume of the pump chamber 30 back and forth.
  • the piston 26 is biased by a biasing arrangement, so for example a spring, in the direction of its first end position, ie the maximum volume of the pump chamber 30.
  • An electrically excitable drive unit 32 that is, for example, an electromagnet arrangement, shifts in electrical Exciting the piston 26 to promote the liquid contained therein by reducing the pump chamber volume 30 in the direction of the combustion chamber 16.
  • a stop is provided for the piston 26 which defines the second end position of the piston 26 with a minimum volume of the pump chamber 30.
  • the drive device 24 In order to move the piston 26, the drive device 24 outputs a pulsed voltage signal U for each operating cycle of the piston 26, that is to say generally a pulse width modulated (PWM) signal.
  • This signal U can be tapped from the supply voltage, wherein by adjusting the duty cycle during the application of the voltage signal U adjusting average voltage, for example, represented by the arithmetic mean, can be adjusted.
  • the electrical current I flowing when the voltage signal U is present can be detected by an ammeter 34, which inputs a corresponding signal into the control device 24.
  • the flow meter 34 may also be part of the drive device 24 itself.
  • the Fig. 2 shows in principle the time course of the current I during a power stroke and normal operation.
  • a working stroke of the piston 26 is defined by a complete reciprocation and begins, for example, each at a time t e , ie the time of the beginning of an energization time interval I e , during which the in the Fig. 2 symbolically indicated by dashed line pulsed voltage signal U is applied to the drive unit 32.
  • a power stroke I A of the piston 26 ends with the beginning of the next energization time interval I e , ie the next time t e .
  • the pulsed voltage signal U is applied to the drive unit 32 at time t e , the current I initially increases until the magnetic force acting on the piston 26 or an armature or the like coupled thereto is so great that at a time t s the piston 26 begins to move.
  • the current flow goes into a shallower section.
  • the stop position ie the second end position, is reached, beyond which the piston 26 can not move on.
  • Such metering pumps are operated so that working at a working frequency in the range of 3-10Hz, ie 3 to 10 work cycles per second.
  • the excitation time interval I e can take a period of about 40 ms.
  • the point in time t at which the second end position, ie the movement stop, is reached should be about 35 ms after the start t e of the excitation time interval I e , so that the time span over which the drive unit stops when the piston 26 is no longer moving 32 is energized as short as possible, however, however, it can be ensured that the piston 26 reaches this second end position.
  • the Fig. 3 shows in association with Fig. 2 the first time derivative of the in Fig. 2 represented current flow.
  • the current initially rises abruptly.
  • the slope of the current waveform then decreases until reaching the time t s again.
  • the gradient continues to fall or fall, so that a negative gradient, ie a negative first time derivative, results.
  • the gradient again increases suddenly and then decreases again, until the time t a, that at the timing at which the energization is actually completed, the current drops again, and thus the Gradient takes a negative value.
  • current curve shows the Fig. 4 the second temporal derivative, ie the first time derivative of the in Fig. 3 shown gradients.
  • Fig. 4 the second temporal derivative, ie the first time derivative of the in Fig. 3 shown gradients.
  • it is characteristic in relation to the two at the times t e and t at the sudden increase of the second time derivative.
  • This behavior of the first derivative and the second time derivative can be used to the two times t s and t on, thus to determined the start of the movement of the piston 26 and the reaching of the stop position of the piston 26th
  • respective thresholds S 1 and S 2 are given. If the first time derivative of the current profile falls below the first threshold S 1 , this is indicated as an indication of the in Fig. 2 recognizable transition into a much flatter current flow, so the beginning of movement evaluated.
  • the point of time t s determined in this way can, as explained below, then be taken into account as the first analysis variable for further evaluation.
  • the time t can be recognized to when the second time derivative exceeds the associated threshold S 2, namely from the beginning of the excitation time interval I e exceeds a second time.
  • the thus determined time t an can then be used as a second analysis variable for further processing.
  • the two times t s and t can be determined in each case as a first analysis variable and as a second analysis variable, for example in the manner described above. Based on these sizes can then, as in the following with reference on the Fig. 5 to 7 explained, various error conditions during operation of the metering pump 10 are detected.
  • the Fig. 5 shows the course of the current I, plotted against time, in the event that, for example, due to shocks or due to an almost complete emptying of the reservoir 22, the metering pump 20 at least temporarily promotes air instead of the liquid fuel.
  • the time t s at which the piston 26 begins to move will in this case occur approximately at the same time as it is in the correct mode of operation. Due to the fact that a lesser movement resistance will be present already from the beginning, it is possible that the piston 26 starts to move slightly earlier.
  • FIG. 6 Another error condition is in Fig. 6 shown.
  • a first analysis variable that is to say the time t s
  • a second analysis variable that is to say the time t on
  • a code indicating this error state that is to say movement blocking of the piston 26, can be set or stored or a numerical value indicating the non-occurrence of the respective analysis variable can be stored as the corresponding time.
  • the Fig. 7 shows an error condition in which within the excitation time interval I e, although the first analysis value t s occurs, so at time t s, the piston 26 begins to move until the end time t a of the excitation time interval , the occurrence or reaching the end stop could not be detected , so no second analysis size could be determined. So, this is a condition in which, upon excitement, the piston 26 has begun to move, but obviously moves too slowly. This can be caused, for example, by the fact that the fuel to be pumped is too tough, or that in the conveying path of the fuel downstream of the metering pump 20, a delivery backlog has occurred, for example due to the blockage of a delivery line.
  • a corresponding error code can be set, which indicates that there is a problem in conveying the fuel through the lines is present, that in principle, however, the metering pump 20 would be able to promote the fuel.
  • the actual applied voltage can be evaluated or stored as a further analysis variable.
  • the memory already described above can be read out and evaluated with regard to the data stored therein.
  • the occurrence of the malfunction may then be completely prevented. Also in the in the Fig. 6 7 and 7 can immediately, if it has been detected in one or more consecutive work cycles, for example, by increasing the average applied voltage to be tried to move the piston faster or at all. If the system is in a startup phase, in which case the fuel line must first be refilled, the information can also be used to extend this start phase accordingly, until it is ensured that there is sufficient fuel in the line to feed in to begin in the combustion chamber 16.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Measuring Volume Flow (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Claims (9)

  1. Une méthode pour analyser l'opération d'une pompe de dosage pour un liquide, en particulier une pompe de dosage de carburant pour un dispositif de chauffage d'un véhicule, la pompe de dosage (20) comprenant un piston (26) cadencé et mobile entre deux positions finales, et un ensemble de commande (32), associé au piston et electriquement excitable par l'application d'un voltage (U) pendant des intervalles d'excitation (Ie) pendant des cadences de travail (IA) respectifs du piston (26), la méthode comprenant les mesures suivantes :
    - déterminer un moment départ (ts) du mouvement du piston (26) en tant que premier paramètre d'analyse
    et
    déterminer un moment de fin (tan) du mouvement du piston (26) en tant que deuxième paramètre d'analyse,
    - comparer au moins un paramètre d'analyse (ts, tan) avec une référence associée (tan'), caractérisée en ce que
    une condition d'erreur est reconnue sur la base du résultat de la comparaison, si le paramètre d'analyse (ts, tan) dévie de la référence (tan'), et par le premier paramètre d'analyse (ts) étant seulement établi si pendant une ou plusieurs cadences précédentes la comparaison du deuxième paramètre d'analyse (tan) avec la référence associée (tan') indique la présence d'une condition d'erreur, aucun deuxième paramètre d'analyse (tan) étant déterminé pendant un intervalle d'excitation (Ie).
  2. Une méthode selon la revendication 1, caractérisée par au moins un paramètre d'analyse (ts, tan) ou/et le résultat de la comparaison d'au moins un paramètre d'analyse avec la référence associée (tan') étant sauvegardé, associé à une cadence de travail (IA) respective du piston (26).
  3. Une méthode selon une des revendications 1 ou 2, caractérisée en ce que, si le deuxième paramètre d'analyse (tan) précède la référence associée (tan'), une condition d'erreur est reconnue comprenant le transport d'air.
  4. Une méthode selon une des revendications 1 à 3, caractérisée en ce que, si le deuxième paramètre d'analyse (tan) succède à la référence associée (tan') dans un intervalle d'excitation (Ie), une condition d'erreur est reconnue comprenant un transport entravé.
  5. Une méthode selon une des revendications 1 à 4, caractérisée en ce que, si aucun deuxième paramètre d'analyse (tan) est reconnu dans un intervalle d'excitation (Ie) mais un premier paramètre d'analyse (ts) est reconnu, une condition d'erreur est reconnue comprenant un transport entravé.
  6. Une méthode selon une des revendications 1 à 5, caractérisée en ce que, si aucun premier paramètre d'analyse (ts) est reconnu dans un intervalle d'excitation (Ie), une condition d'erreur est reconnue comprenant un blocage du mouvement du piston (26).
  7. Une méthode selon une des revendications 1 à 6, caractérisée en ce que, si le deuxième paramètre d'analyse (tan) précède ou succède à la référence associée (tan') dans un intervalle d'excitation (Ie), on essaye pendant au moins une cadence de travail (IA) de décaler le deuxième paramètre d'analyse (tan) envers la référence (tan') en variant le voltage d'excitation (U) de l'ensemble de commande (32), et en ce que si une variation du voltage d'excitation (U) ne résulte pas dans un décalage suffisant du deuxième paramètre d'analyse (tan), une condition d'erreur est reconnue.
  8. Une méthode selon une des revendications 1 à 7, caractérisée par le premier paramètre d'analyse (ts) étant établi en déterminant la première déduction sur le temps du courant (I) circulant pendant un intervalle d'excitation (Ie) et en comparant la déduction avec un premier seuil (S1) correspondant.
  9. Une méthode selon une des revendications 1 à 8, caractérisée par le deuxième paramètre d'analyse (tan) étant déterminé en déterminant la deuxième déduction sur le temps du courant (I) circulant pendant un intervalle d'excitation (Ie) et en comparant la déduction avec un deuxième seuil (S1) correspondant.
EP08018650A 2007-12-20 2008-10-24 Procédé destiné à l'analyse du fonctionnement d'une pompe de dosage pour liquides, notamment d'une pompe de dosage de carburant pour un appareil de chauffage pour véhicule Not-in-force EP2072820B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007061478A DE102007061478A1 (de) 2007-12-20 2007-12-20 Verfahren zum Analysieren des Betriebs einer Dosierpumpe für Flüssigkeit, inbesondere einer Brennstoffdosierpumpe für ein Fahrzeugheizgerät

Publications (3)

Publication Number Publication Date
EP2072820A1 EP2072820A1 (fr) 2009-06-24
EP2072820A8 EP2072820A8 (fr) 2009-09-30
EP2072820B1 true EP2072820B1 (fr) 2010-07-28

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Application Number Title Priority Date Filing Date
EP08018650A Not-in-force EP2072820B1 (fr) 2007-12-20 2008-10-24 Procédé destiné à l'analyse du fonctionnement d'une pompe de dosage pour liquides, notamment d'une pompe de dosage de carburant pour un appareil de chauffage pour véhicule

Country Status (3)

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EP (1) EP2072820B1 (fr)
AT (1) ATE475805T1 (fr)
DE (2) DE102007061478A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010014106B4 (de) * 2010-04-07 2012-03-15 Webasto Ag Verfahren zum Betreiben einer Dosierpumpe und Vorrichtung mit einer Dosierpumpe
DE102011088699B4 (de) 2011-12-15 2019-07-04 Robert Bosch Gmbh Verfahren zum Steuern einer Hubkolbenpumpe
DE102013207345B4 (de) * 2013-04-23 2021-04-29 Robert Bosch Gmbh Verfahren zum Betreiben einer Hubkolbenpumpe
DE102017008988A1 (de) * 2017-09-26 2019-03-28 Albonair Gmbh Verfahren zur Überwachung einer Magnetkolbenpumpe
DE102021003261A1 (de) 2021-06-25 2022-12-29 Truma Gerätetechnik GmbH & Co. KG Heizvorrichtung und Verfahren zur Überwachung einer Pumpenvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH675312A5 (en) * 1988-06-13 1990-09-14 Rueck & Meier Ag Fluid dosing device using timed pump operation - compensates set time for detected variation in pump flow
DE10152782B4 (de) * 2001-10-29 2005-04-07 Webasto Ag Verfahren zum Ansteuern einer Dosierpumpe
DE102005024858A1 (de) 2005-05-31 2006-12-07 J. Eberspächer GmbH & Co. KG Verfahren zum Betreiben einer Dosierpumpe, insbesondere zum Fördern von Brennstoff für ein Fahrzeugheizgerät

Also Published As

Publication number Publication date
DE502008001023D1 (de) 2010-09-09
EP2072820A1 (fr) 2009-06-24
ATE475805T1 (de) 2010-08-15
EP2072820A8 (fr) 2009-09-30
DE102007061478A1 (de) 2009-06-25

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