EP1400684B1 - Circuit for a pulse width modulation controlled electromagnetic purge valve for venting a tank of a vehicle - Google Patents

Circuit for a pulse width modulation controlled electromagnetic purge valve for venting a tank of a vehicle Download PDF

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Publication number
EP1400684B1
EP1400684B1 EP03015410A EP03015410A EP1400684B1 EP 1400684 B1 EP1400684 B1 EP 1400684B1 EP 03015410 A EP03015410 A EP 03015410A EP 03015410 A EP03015410 A EP 03015410A EP 1400684 B1 EP1400684 B1 EP 1400684B1
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EP
European Patent Office
Prior art keywords
circuit arrangement
valve
arrangement according
pulse
pulse width
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Expired - Lifetime
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EP03015410A
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German (de)
French (fr)
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EP1400684A3 (en
EP1400684A2 (en
Inventor
Torsten Gerlich
Christopher Klatt
Ralf Heinrich
Christof Klesen
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Eagle Actuator Components GmbH and Co KG
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Eagle Actuator Components GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1811—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current demagnetising upon switching off, removing residual magnetism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F2007/1888—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings using pulse width modulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1844—Monitoring or fail-safe circuits

Definitions

  • the invention relates to a circuit arrangement for a pulse width modulated controllable electromagnetic regeneration valve for tank ventilation of a motor vehicle, comprising a voltage source for supplying the magnetic coil of the regeneration valve with electrical energy, a control unit for generating pulse width modulated signals and a switching device via which the magnetic coil with the pulse width modulated signals of the control unit can be acted upon ,
  • a regeneration valve is usually an electromagnetic driven valve comprising a solenoid, an armature with sealing element, a sealing seat and a return spring (closing spring).
  • the armature In the energized state, the armature lifts the sealing element against the spring force of the closing spring from the sealing seat by the magnetic force of the coil and thereby releases the flow opening.
  • the valve In the de-energized state, the sealing element is pressed by the closing spring on the sealing seat, the valve is in Scht manposition.
  • the control of the regeneration valve via the engine control, which determines the respective maximum loadable air-fuel mass flow according to the respective load state of the internal combustion engine and converts it into a corresponding control signal.
  • the regeneration valve is usually pulsed (pulse width modulated) driven and outputs, depending on the motor control each predetermined duty cycle, different dosing discontinuously.
  • Tastverhit is in this context, the ratio between the total period, d. H. the period of the open and closed valve, the period of the open valve understood.
  • the clock frequency is selected to be so high that the valve can no longer follow the oscillating excitation and instead remains in a position that corresponds to the respective mean coil current
  • the publication FR 2797022 shows a solenoid valve in which a zener diode is used to protect a transistor from voltage spikes.
  • a disadvantage of the known regeneration valves of the type described above is that it is both clocked and pulse-width modulated proportional operation to an undesirable noise, which has not yet been prevented.
  • the object of the invention is to provide a circuit arrangement for an electromagnetic regeneration valve for tank ventilation of a motor vehicle, by means of which the noise can be significantly reduced both in clocked and in proportional operation.
  • a pulse width modulated controllable electromagnetic regeneration valve for tank ventilation of a motor vehicle which is a voltage source for supplying the magnetic coil of the regeneration valve with electrical energy, a control unit for generating pulse width modulated signals and a switching device via which the magnetic coil with the pulse width modulated signals Control unit is acted upon, comprises means for suppressing high induced voltages to the solenoid provided.
  • these means are a so-called freewheeling diode, which is connected in parallel to the magnetic coil.
  • the regeneration valve is preferably activated in proportional operation at a pulse frequency between 20 Hz and 200 Hz. It has been found that in the commonly used clocked proportional valves, the valve characteristic (mass flow as a function of pulse duration) becomes steeper and non-linear with an increase in the pulse frequency, which leads to a deterioration of the dosing accuracy. This behavior can be explained by the fact that on the one hand by the inductance of the coil, the current build-up in the coil is slowed down and on the other hand, the inertia of the mass to be moved is overcome. With increasing pulse frequency thus a higher coil current for opening the valve gap is required. In proportional operation, the pulse frequency is preferably about 50 Hz. It has been shown that this frequency is already sufficient to ensure a quasi-proportional operation in which a coil current always flows and thus the valve armature does not strike.
  • the circuit arrangement according to the invention has the advantage that the currently located in motor vehicles control electronics can be left, which is to be evaluated as a significant cost advantage, since nothing prevents the use of the circuit in existing series.
  • the inventive Circuit arrangement can be used both for the clocked and for the proportional operation.
  • Fig. 1 shows the block diagram of the control of the regeneration valve.
  • the magnetic circuit of the valve is represented by the resistance R Sp and the inductance L Sp .
  • Parallel to this, the freewheeling diode D f used according to the invention is shown.
  • the power transistor, in which a diode D s is integrated for protection purposes, is controlled by control pulses of constant frequency and variable pulse width and thus switches the battery or vehicle electrical system voltage U b to the valve.
  • the control is usually via the engine control.
  • the pulse width modulated control of a solenoid valve and in particular in a motor vehicle is known per se and often described, which is why at this point not further discussed.
  • Fig. 2 shows by way of example the course of the current in the magnetic coil at a pulse frequency of 50 Hz in proportional operation and a) without a freewheeling diode a duty cycle of 20%, b) with freewheeling diode with a duty cycle of 20% and c) with a duty cycle of 90% with freewheeling diode. It can be seen that the current reduction with free-wheeling diode is significantly slowed down. At a duty cycle of 90%, the coil current is always greater than 0. The effect on the armature movement shows Fig. 3 , With a duty cycle of 20% a) without free-wheeling diode, the behavior compared to the free-wheeling diode b) is significantly rougher.
  • the anchor returns very quickly to the rest position, which is obviously due to the massive noise. It is even in the embodiment with diode a very gentle closing behavior of the valve, the noise. is significantly reduced. With a duty cycle of 90% with freewheeling diode c) it is no longer possible to close the valve. This leads to a complete freedom from noise.
  • circuit arrangement according to the invention leads not only in proportional operation at high pulse frequencies to a significant noise reduction, but due to the slow current reduction after a pulse in the clocked operation.

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Schaltungsanordnung für ein pulsweitenmoduliert ansteuerbares elektromagnetisches Regenerierventil zur Tankentlüftung eines Kraftfahrzeugs, umfassend eine Spannungsquelle zur Versorgung der Magnetspule des Regenerierventils mit elektrischer Energie, eine Steuereinheit zur Erzeugung pulsweitenmodulierter Signale sowie eine Schalteinrichtung über welche die Magnetspule mit den pulsweitenmodulierten Signalen der Steuereinheit beaufschlagbar ist.The invention relates to a circuit arrangement for a pulse width modulated controllable electromagnetic regeneration valve for tank ventilation of a motor vehicle, comprising a voltage source for supplying the magnetic coil of the regeneration valve with electrical energy, a control unit for generating pulse width modulated signals and a switching device via which the magnetic coil with the pulse width modulated signals of the control unit can be acted upon ,

Stand der TechnikState of the art

Es ist bekannt, die in der Tankanlage eines Kraftfahrzeugs befindlichen flüchtigen Kraftstoffdämpfe aufzufangen und zu speichern und schließlich dosiert dem Saugrohr der Verbrennungskraftmaschine des Kraftfahrzeugs zuzuführen. Als Einrichtung zum Auffangen und Speichern der Kraftstoffdämpfe wird in der Regel ein Aktivkohlebehälter verwendet. Aktivkohle bindet (absorbiert) den Kraftstoffdampf und gibt ihn bei entsprechender Belüftung wieder frei. Im Fahrbetrieb wird daher durch den Motor Frischluft durch den Aktivkohlebehälter gesaugt, die den Kraftstoff aufnimmt und dem Motor zuführt. Die Zudosierung des Luft-Kraftstoffgemischs erfolgt über ein sogenanntes Regenerierventil. Bei einem Regenerierventil handelt es sich üblicherweise um ein elektromagnetisch angetriebenes Ventil, das eine Magnetspule, einen Anker mit Dichtelement, einen Dichtsitz sowie eine Rückstellfeder (Schließfeder) umfasst. Im bestromten Zustand hebt der Anker durch die Magnetkraft der Spule das Dichtelement gegen die Federkraft der Schließfeder vom Dichtsitz ab und gibt dadurch die Durchflussöffnung frei. Das Ventil befindet sich in seiner Öffnungsposition. Im unbestromten Zustand wird das Dichtelement durch die Schließfeder auf den Dichtsitz gepresst, das Ventil befindet sich in Schtießposition.It is known to trap the volatile fuel vapors located in the tank system of a motor vehicle and to store and finally metered supply to the intake manifold of the internal combustion engine of the motor vehicle. As a means for capturing and storing the fuel vapor an activated carbon canister is usually used. Activated carbon binds (absorbs) the fuel vapor and releases it again with appropriate ventilation. When driving is therefore sucked by the engine fresh air through the charcoal canister, which receives the fuel and feeds the engine. The metered addition of the air-fuel mixture via a so-called regeneration valve. A regeneration valve is usually an electromagnetic driven valve comprising a solenoid, an armature with sealing element, a sealing seat and a return spring (closing spring). In the energized state, the armature lifts the sealing element against the spring force of the closing spring from the sealing seat by the magnetic force of the coil and thereby releases the flow opening. The valve is in its open position. In the de-energized state, the sealing element is pressed by the closing spring on the sealing seat, the valve is in Schtießposition.

Die Ansteuerung des Regenerierventils erfolgt über die Motorsteuerung, die entsprechend dem jeweiligen Lastzustand der Verbrennungskraftmaschine den jeweils maximal zudosierbaren Luft-Kraftstoff-Massenstrom ermittelt und in ein entsprechendes Steuersignal umsetzt. Das Regenerierventil wird dabei in der Regel getaktet (pulsweitenmoduliert) angesteuert und gibt, abhängig von dem von der Motorsteuerung jeweils vorgegebenen Tastverhältnis, unterschiedliche Dosiermengen diskontinuierlich ab. Unter Tastverhäitnis wird in diesem Zusammenhang das Verhältnis zwischen der Gesamtperiodendauer, d. h. der Periodendauer des geöffneten und geschlossenen Ventils, zur Periodendauer des geöffneten Ventils verstanden.The control of the regeneration valve via the engine control, which determines the respective maximum loadable air-fuel mass flow according to the respective load state of the internal combustion engine and converts it into a corresponding control signal. The regeneration valve is usually pulsed (pulse width modulated) driven and outputs, depending on the motor control each predetermined duty cycle, different dosing discontinuously. Under Tastverhit is in this context, the ratio between the total period, d. H. the period of the open and closed valve, the period of the open valve understood.

Um die oszillierende Bewegung des Magnetankers mit dem Dichtelement zwischen der Öffnungs- und Schiießposition, was verschiedene Nachteile mit sich bringt, zu vermeiden, ist es auch bekannt, beispielsweise aus der WO 99/06893 , das getaktete Regenerierventil im sogenannten Proportionaibetrieb zu betreiben. Hierbei wird die Taktfrequenz so hoch gewählt werden, dass das Ventil der oszillierenden Anregung nicht mehr folgen kann und stattdessen jeweils in einer Position verharrt, die dem jeweiligen mittleren Spulenstrom entspricht,In order to avoid the oscillating movement of the armature with the sealing element between the opening and Schiießposition, which entails various disadvantages, it is also known, for example from the WO 99/06893 to operate the clocked regeneration valve in the so-called proportioning operation. In this case, the clock frequency is selected to be so high that the valve can no longer follow the oscillating excitation and instead remains in a position that corresponds to the respective mean coil current,

Die Offenlegungsschrift FR 2797022 zeigt ein Magnetventil, bei welchem eine Zener-Diode verwendet wird, um einen Transistor vor Spannungsspitzen zu schützen.The publication FR 2797022 shows a solenoid valve in which a zener diode is used to protect a transistor from voltage spikes.

Nachteilig an den bekannten Regenerierventilen der oben beschriebenen Art ist, dass es sowohl im getakteten als auch im pulsweitenmoduiierten Proportionalbetrieb zu einer unerwünschten Geräuschentwicklung kommt, die bisher noch nicht verhindert werden konnte.A disadvantage of the known regeneration valves of the type described above is that it is both clocked and pulse-width modulated proportional operation to an undesirable noise, which has not yet been prevented.

Darstellung der ErfindungPresentation of the invention

Aufgabe der Erfindung ist, eine Schaltungsanordnung für ein elektromagnetisches Regenerierventil zur Tankentlüftung eines Kraftfahrzeugs bereitzustellen, mittels welcher sich die Geräuschentwicklung sowohl im getakteten als auch im Proportionalbetrieb erheblich reduzieren lässt.The object of the invention is to provide a circuit arrangement for an electromagnetic regeneration valve for tank ventilation of a motor vehicle, by means of which the noise can be significantly reduced both in clocked and in proportional operation.

Diese Aufgabe wird gelöst mit einer Schaltungsanordnung mit allen Merkmalen des Anspruchs 1. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved with a circuit arrangement having all the features of claim 1. Advantageous embodiments of the invention are described in the subclaims.

Gemäß der Erfindung sind bei einer Schaltungsanordnung für ein pulsweitenmoduliert ansteuerbares elektromagnetisches Regenerierventil zur Tankentlüftung eines Kraftfahrzeugs, welche eine Spannungsquelle zur Versorgung der Magnetspule des Regenerierventils mit elektrischer Energie, eine Steuereinheit zur Erzeugung pulsweitenmodulierter Signale sowie eine Schalteinrichtung, über welche die Magnetspule mit den pulsweitenmodulierten Signalen der Steuereinheit beaufschlagbar ist, umfasst, Mittel zur Unterdrückung hoher Induktionsspannungen an der Magnetspule vorgesehen. Im einfachsten Fall handelt es sich bei diesen Mitteln um eine sogenannte Freilaufdiode, die der Magnetspule parallel geschaltet wird.According to the invention, in a circuit arrangement for a pulse width modulated controllable electromagnetic regeneration valve for tank ventilation of a motor vehicle, which is a voltage source for supplying the magnetic coil of the regeneration valve with electrical energy, a control unit for generating pulse width modulated signals and a switching device via which the magnetic coil with the pulse width modulated signals Control unit is acted upon, comprises means for suppressing high induced voltages to the solenoid provided. In the simplest case, these means are a so-called freewheeling diode, which is connected in parallel to the magnetic coil.

Es hat sich in überraschender Weise gezeigt, dass sich bei Parallelschaltung einer Freilaufdiode zur Magnetspule eine erhebliche Reduzierung der Ventilgeräusche erzielen lässt. Der Einsatz von Freilaufdioden ist in der Ventiltechnik an sich bekannt und dient üblicherweise dazu, die den Spulenstrom steuernden Leistungsschalter vor den beim Schalten des Ventils auftretenden hohen Induktionsspannungen zu schützen. Ebenso ist bekannt, dass diese Maßnahme zu einer unerwünschten Verlängerung der Spulenreaktionszeit führt. Die DE 196 52 391 sieht daher Maßnahmen zur Wiederherstellung der schnellen Spulenreaktion vor. Hieraus resultiert aber offensichtlich eine Beruhigung der Ankerbewegung des Magnetventils, die ausreicht, die sonst übliche massive Geräuschentwicklung deutlich zu reduzieren. Dies gilt sowohl für den Proportionalbetrieb als auch für den getakteten Betrieb des Ventils.It has surprisingly been found that in parallel connection of a freewheeling diode to the solenoid coil, a significant reduction of the valve noise achieve. The use of freewheeling diodes is known per se in valve technology and usually serves to protect the circuit breakers controlling the coil current from the high induction voltages occurring when the valve is switched. It is also known that this measure leads to an undesirable extension of the coil reaction time. The DE 196 52 391 therefore provides measures to restore the fast coil reaction. However, this obviously results in a calming of the armature movement of the solenoid valve, which is sufficient to significantly reduce the otherwise usual massive noise development. This applies both to the proportional mode and to the clocked operation of the valve.

Vorzugsweise wird das Regenerierventil bei der erfindungsgemäßen Schaltungsanordnung im Proportionalbetrieb mit einer Pulsfrequenz zwischen 20 Hz und 200 Hz angesteuert. Es hat sich gezeigt, dass bei den üblicherweise verwendeten getakteten Proportionalventilen die Ventilkennlinie (Massenfluss in Abhängigkeit von Pulsdauer) bei einer Erhöhung der Pulsfrequenz steiler und nichtlinearer wird, was zu einer Verschlechterung der Dosiergenauigkeit führt. Dieses Verhalten lässt sich damit erklären, dass zum einen durch die Induktivität der Spule der Stromaufbau in der Spule verlangsamt wird und zum anderen die Trägheit der zu bewegenden Masse zu überwinden ist. Mit zunehmender Pulsfrequenz ist somit ein höherer Spulenstrom zur Öffnung des Ventilspalts erforderlich. Vorzugsweise beträgt die Pulsfrequenz im Proportionalbetrieb etwa 50 Hz. Es hat sich gezeigt, dass diese Frequenz bereits ausreicht, um einen quasi-proportionalen Betrieb, bei dem immer ein Spulenstrom fließt und somit der Ventilanker nicht anschlägt, zu gewährleisten.In the case of the circuit arrangement according to the invention, the regeneration valve is preferably activated in proportional operation at a pulse frequency between 20 Hz and 200 Hz. It has been found that in the commonly used clocked proportional valves, the valve characteristic (mass flow as a function of pulse duration) becomes steeper and non-linear with an increase in the pulse frequency, which leads to a deterioration of the dosing accuracy. This behavior can be explained by the fact that on the one hand by the inductance of the coil, the current build-up in the coil is slowed down and on the other hand, the inertia of the mass to be moved is overcome. With increasing pulse frequency thus a higher coil current for opening the valve gap is required. In proportional operation, the pulse frequency is preferably about 50 Hz. It has been shown that this frequency is already sufficient to ensure a quasi-proportional operation in which a coil current always flows and thus the valve armature does not strike.

Die erfindungsgemäße Schaltungsanordnung hat den Vorteil, dass die derzeit in Kraftfahrzeugen vorhandene ansteuerseitige Elektronik belassen werden kann, was als deutlicher Kostenvorteil zu bewerten ist, da einem Einsatz der Schaltungsanordnung in bestehende Serien nichts entgegensteht. Die erfindungsgemäße Schaltungsanordnung ist sowohl für den getakteten als auch für den Proportionalbetrieb einsetzbar.The circuit arrangement according to the invention has the advantage that the currently located in motor vehicles control electronics can be left, which is to be evaluated as a significant cost advantage, since nothing prevents the use of the circuit in existing series. The inventive Circuit arrangement can be used both for the clocked and for the proportional operation.

Nachfolgend wird die Erfindung anhand der Figuren näher erläutert.The invention will be explained in more detail with reference to the figures.

Es zeigen:

Figur 1
ein Blockschaltbild einer bevorzugten Ausführungsform der Erfindung;
Figur 2
den Stromverlauf der Magnetspule bei einer Pulsfrequenz von 50 Hz und verschiedenen Einschaltdauern mit und ohne Freilaufdiode.
Figur 3
die zugehörige Ankerbewegung zu den Diagrammen aus Fig.1.
Show it:
FIG. 1
a block diagram of a preferred embodiment of the invention;
FIG. 2
the current flow of the solenoid at a pulse frequency of 50 Hz and different duty cycles with and without freewheeling diode.
FIG. 3
the associated anchor movement to the diagrams Fig.1 ,

Fig. 1 zeigt das Blockschaltbild der Ansteuerung des Regenerierventils. Der magnetische Kreis des Ventils wird durch den Widerstand RSp und die Induktivität LSp repräsentiert. Parallel dazu ist die erfindungsgemäß eingesetzte Freilaufdiode Df dargestellt. Der Leistungstransistor,in den zu Schutzzwecken eine Diode Ds integriert ist, wird mit Steuerpulsen konstanter Frequenz und variabler Pulsweite angesteuert und schaltet damit die Batterie bzw. Bordnetzspannung Ub auf das Ventil auf. Die Steuerung erfolgt in der Regel über die Motorsteuerung. Die Pulsweitenmodulierte Ansteuerung eines Magnetventils und insbesondere auch in einem Kraftfahrzeug ist an sich bekannt und vielfach beschrieben, weshalb an dieser Stelle nicht weiter darauf eingegangen wird. Fig. 1 shows the block diagram of the control of the regeneration valve. The magnetic circuit of the valve is represented by the resistance R Sp and the inductance L Sp . Parallel to this, the freewheeling diode D f used according to the invention is shown. The power transistor, in which a diode D s is integrated for protection purposes, is controlled by control pulses of constant frequency and variable pulse width and thus switches the battery or vehicle electrical system voltage U b to the valve. The control is usually via the engine control. The pulse width modulated control of a solenoid valve and in particular in a motor vehicle is known per se and often described, which is why at this point not further discussed.

Fig. 2 zeigt exemplarisch den Verlauf des Stroms in der Magnetspule bei einer Pulsfrequenz von 50 Hz im Proportionalbetrieb und a) ohne Freilaufdiode bei einer Einschaltdauer von 20 %, b) mit Freilaufdiode bei einer Einschaltdauer von 20 % und c) bei einer Einschaltdauer von 90 % mit Freilaufdiode. Man erkennt, dass der Stromabbau mit Freilaufdiode deutlich verlangsamt ist. Bei einer Einschaltdauer von 90 % ist der Spulenstrom sogar immer größer als 0. Die Auswirkungen auf die Ankerbewegung zeigt Fig. 3. Bei einer Einschaltdauer von 20 % a) ohne Freilaufdiode ist das Verhalten gegenüber dem mit Freilaufdiode b) deutlich ruppiger. Insbesondere kehrt der Anker sehr schnell in die Ruhelage zurück, worauf offensichtlich die massive Geräuschentwicklung zurückzuführen ist. Es zeigt sich sogar bei der Ausführungsform mit Diode ein ausgesprochen sanftes Schließverhalten des Ventils, die Geräuschentwicklung . ist deutlich reduziert. Bei einer Einschaltdauer von 90 % mit Freilaufdiode c) kommt es gar nicht mehr zum Schließen des Ventils. Dies führt zu einer völligen Geräuschfreiheit. Fig. 2 shows by way of example the course of the current in the magnetic coil at a pulse frequency of 50 Hz in proportional operation and a) without a freewheeling diode a duty cycle of 20%, b) with freewheeling diode with a duty cycle of 20% and c) with a duty cycle of 90% with freewheeling diode. It can be seen that the current reduction with free-wheeling diode is significantly slowed down. At a duty cycle of 90%, the coil current is always greater than 0. The effect on the armature movement shows Fig. 3 , With a duty cycle of 20% a) without free-wheeling diode, the behavior compared to the free-wheeling diode b) is significantly rougher. In particular, the anchor returns very quickly to the rest position, which is obviously due to the massive noise. It is even in the embodiment with diode a very gentle closing behavior of the valve, the noise. is significantly reduced. With a duty cycle of 90% with freewheeling diode c) it is no longer possible to close the valve. This leads to a complete freedom from noise.

Aus dem obigen folgt, dass die erfindungsgemäße Schaltungsanordnung nicht nur im Proportionalbetrieb bei hohen Pulsfrequenzen zu einer deutlichen Geräuschreduzierung führt, sondern aufgrund des langsamen Stromabbaus nach einem Puls auch im getakteten Betrieb.From the above it follows that the circuit arrangement according to the invention leads not only in proportional operation at high pulse frequencies to a significant noise reduction, but due to the slow current reduction after a pulse in the clocked operation.

Claims (7)

  1. Circuit arrangement for an electromagnetic regeneration valve, which can be actuated in a pulse-width-modulated manner, for venting a tank of a motor vehicle, comprising a voltage source for supplying electrical energy to the magnet coil of the regeneration valve, a control unit for generating pulse-width-modulated signals, and also a switching device by means of which the pulse-width-modulated signals from the control unit can be applied to the magnet coil, characterized in that means for suppressing high induction voltages are provided on the magnet coil, wherein the means comprise a free-wheedling diode which is connected in parallel with the magnet coil and is designed to reduce the valve noise by slowing down the armature movement of the solenoid valve.
  2. Circuit arrangement according to Claim 1, characterized in that the regeneration valve can be actuated with proportional operation at a pulse frequency of between 20 Hz and 200 Hz.
  3. Circuit arrangement according to Claim 2, characterized in that the regeneration valve can be actuated at a pulse frequency of approximately 50 Hz.
  4. Circuit arrangement according to one of Claims 1 to 3, characterized in that the voltage source comprises the on-board electrical system of the motor vehicle.
  5. Circuit arrangement according to one of Claims 1 to 4, characterized in that the control unit comprises the motor controller.
  6. Circuit arrangement according to one of Claims 1 to 5, characterized in that the switching device comprises a power transistor.
  7. Circuit arrangement according to Claim 6, characterized in that a diode is connected in parallel with the power transistor.
EP03015410A 2002-09-20 2003-07-09 Circuit for a pulse width modulation controlled electromagnetic purge valve for venting a tank of a vehicle Expired - Lifetime EP1400684B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10243956A DE10243956A1 (en) 2002-09-20 2002-09-20 Circuit arrangement for a pulse-width modulated controllable electromagnetic regeneration valve for tank ventilation of a motor vehicle
DE10243956 2002-09-20

Publications (3)

Publication Number Publication Date
EP1400684A2 EP1400684A2 (en) 2004-03-24
EP1400684A3 EP1400684A3 (en) 2006-12-06
EP1400684B1 true EP1400684B1 (en) 2012-10-31

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Application Number Title Priority Date Filing Date
EP03015410A Expired - Lifetime EP1400684B1 (en) 2002-09-20 2003-07-09 Circuit for a pulse width modulation controlled electromagnetic purge valve for venting a tank of a vehicle

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US (1) US20040105209A1 (en)
EP (1) EP1400684B1 (en)
JP (1) JP2004116522A (en)
CA (1) CA2441249C (en)
DE (1) DE10243956A1 (en)

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US20110017178A1 (en) * 2009-07-21 2011-01-27 Mcdonald William Keith Canister purge control valve control systems
DE102011089228A1 (en) * 2011-12-20 2013-06-20 Robert Bosch Gmbh Device for controlling electrically actuated valves in various modes
DE102015218684A1 (en) * 2015-09-29 2017-03-30 Robert Bosch Gmbh A method for regenerating an activated carbon filter of a tank ventilation system and tank ventilation system for a motor vehicle with a single-cylinder internal combustion engine
CN109311388B (en) * 2016-04-15 2022-05-31 伊顿智能动力有限公司 Vapor impermeable solenoid valve for fuel vapor environments
FR3090185A1 (en) * 2018-12-17 2020-06-19 Valeo Systeme De Controle Moteur ELECTROMECHANICAL DEVICE INCLUDING A NOISE MITIGATION SYSTEM
CN109686616B (en) * 2019-01-21 2020-04-28 广东美的制冷设备有限公司 Relay drive circuit and air conditioner

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Also Published As

Publication number Publication date
EP1400684A3 (en) 2006-12-06
EP1400684A2 (en) 2004-03-24
CA2441249C (en) 2007-06-05
JP2004116522A (en) 2004-04-15
DE10243956A1 (en) 2004-04-15
US20040105209A1 (en) 2004-06-03
CA2441249A1 (en) 2004-03-20

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