EP0800621B1 - Ventil zum dosierten einleiten von aus einem brennstofftank einer brennkraftmaschine verflüchtigtem brennstoffdampf - Google Patents

Ventil zum dosierten einleiten von aus einem brennstofftank einer brennkraftmaschine verflüchtigtem brennstoffdampf Download PDF

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Publication number
EP0800621B1
EP0800621B1 EP96918613A EP96918613A EP0800621B1 EP 0800621 B1 EP0800621 B1 EP 0800621B1 EP 96918613 A EP96918613 A EP 96918613A EP 96918613 A EP96918613 A EP 96918613A EP 0800621 B1 EP0800621 B1 EP 0800621B1
Authority
EP
European Patent Office
Prior art keywords
valve
armature
valve according
electromagnet
cross
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.)
Expired - Lifetime
Application number
EP96918613A
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German (de)
English (en)
French (fr)
Other versions
EP0800621A1 (de
Inventor
Wolfgang Schulz
Georg Mallebrein
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0800621A1 publication Critical patent/EP0800621A1/de
Application granted granted Critical
Publication of EP0800621B1 publication Critical patent/EP0800621B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • 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
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
    • 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
    • F02M2025/0845—Electromagnetic valves

Definitions

  • the invention is based on a valve for metered Discharge from a fuel tank one Internal combustion engine evaporated fuel vapor into one Intake pipe of the internal combustion engine according to the genus of Claim 1.
  • a valve for metered Discharge from a fuel tank one Internal combustion engine evaporated fuel vapor into one Intake pipe of the internal combustion engine according to the genus of Claim 1.
  • Such a valve is already known (EP-PS 0 528 849), the fuel vapor via an inflow nozzle is supplied to this in a metered manner on a Valve provided in the intake pipe to deliver.
  • the inflow connection of the valve is for example via a hose line with an adsorption filter connected to the volatilized from the fuel tank Fuel vapor cached.
  • the valve is trained electromagnetically actuated and has this purpose a magnetic armature by the magnetic forces of an electromagnet against the force of a valve spring is axially displaceable.
  • Electromagnet In the de-energized state of the Electromagnet is used as a valve closing member trained end area of the armature by means of the valve spring pressed to a valve seat to establish a flow connection from the To interrupt the inlet connection to the outlet connection.
  • the armature in the energized state, the armature moves against the force of the Valve spring and lifts with its as a valve closing member trained end area from the valve seat, one The metering opening on the outflow nozzle is opened so that a certain fuel vapor volume from the inflow nozzle the outflow pipe can flow into the intake pipe.
  • the solenoid of the valve is activated using a so-called pulse-width modulated signal, that results from a pulse train of an electric current composed of the excitation coil with constant frequency flows through the electromagnet.
  • a pulse-width modulated signal that results from a pulse train of an electric current composed of the excitation coil with constant frequency flows through the electromagnet.
  • the pulse duration of the individual current pulses by means of a Control electronics enlarged or reduced to one continuously changing attraction of the Get electromagnets on the anchor. It turns out depending on the pulse duration of the individual pulses certain axial position of the armature in which he persists to by one of the axial position of the Valve closing member of the armature dependent throttling of the Flow at the metering opening a certain Fuel vapor volume through the metering opening in the To deliver the discharge nozzle.
  • the magnetic force of the Electromagnets depend on the pulse duration of the individual current pulses and is replaced by the so-called Duty cycle determined.
  • the duty cycle gives the Quotient of the pulse duration to the pulse interval (period duration) of the individual impulses. Due to friction effects and Spring forces only occur after a certain one Duty cycle, which is also called an opening duty cycle is a lifting of the anchor from its Valve seat. Hysteresis effects have the consequence that the Opening duty cycle changes with each renewed activation can change so that an exact metering is smallest Fuel vapor volume with such a valve so far not possible. Furthermore, the winding resistance the excitation coil of the electromagnet temperature-dependent, so that also the opening duty cycle from temperature depends. Therefore, it is necessary to use the electromagnet to be controlled by means of a current-controlled output stage provides pulse-width modulated current signal. A such a current-controlled output stage is with one a DC voltage source usually equipped Vehicle is known to be relatively expensive to implement.
  • the described, constantly working valve gives increasing duty cycle an essentially linear increasing fuel vapor flow.
  • the linear character the described valve complicates the metering smallest fuel vapor volume with a relatively small one Duty cycle.
  • the second vacuum operated valve is parallel to the first arranged electromagnetically actuated valve which at Reaching a certain vacuum in the intake pipe opens, to introduce more fuel vapor into the intake pipe.
  • such a system consisting of two valves complex. It also requires the specified Valve combination has a long switch-off time to the Cut off the fuel supply so that a sensitive Adjustment of the volume of each time unit in the intake pipe injected fuel vapor in different Operating states of the internal combustion engine is hardly possible.
  • valve according to the invention with the characteristic In contrast, features of claim 1 have the advantage excellent small quantity metering and one simple construction.
  • valve is particularly advantageous trained pressure equalization connection, which enables the fuel vapor flow emitted by the valve independently of the negative pressure prevailing in the intake pipe.
  • an intended compensation of the Temperature dependence of the excitation coil of the electromagnet which allows for an elaborate current controlled To dispense with the power amplifier and control it replace at which voltage pulses with preferably relatively high frequency of the excitation coil to be supplied a particularly sensitive metering of the To allow fuel vapor volume.
  • the special design of the Metering opening in the valve which gives the valve an exponential Opening characteristic gives to the absolute error in the To minimize the small quantity range. The exponential Opening characteristic also acts due to errors Counter hysteresis effects, so that another Improvement of the small-quantity metering of the valve is possible.
  • FIG. 1 shows a Longitudinal section of a valve designed according to the invention
  • Figure 2 shows a first section along a line II-II in Figure 1 according to a first invention Embodiment
  • Figure 3 along a second section a line III-III in Figure 1 according to a second 4 shows a diagram, that the opening characteristic of the invention trained valve (course B) compared to known Valves (course A) shows.
  • the valve 1 shown in longitudinal section in FIG. 1 serves for the metered introduction of one from a fuel tank 3 not shown, in particular mixture-compressing, spark-ignited internal combustion engine volatilized fuel vapor in an intake pipe 4 of the Internal combustion engine.
  • the valve 1 is part of a Evaporative control system of the Internal combustion engine, the mode of operation of which, for example Bosch technical briefing, engine management Motronic, second edition, August 1993, pages 48 and 49 is removable.
  • the valve 1 has, for example, three parts existing valve housing, which consists of a cylindrical Basic housing 6, one that can be placed on the basic housing 6 Housing cover 7 and a lower housing part 8 put together.
  • the cylindrical base housing 6, the Housing cover 7 and the lower housing part 8 are preferably made of plastic, for example in Plastic injection molding technology, manufactured.
  • the lower Housing part 8 has an inflow nozzle 10 and one Outflow connection 11.
  • the inflow nozzle 10 is used for Connecting the valve 1, for example via a first one Hose line 14, to the fuel tank 3 or, as in FIG. 1 is shown, to one with the fuel tank 3 connected adsorption filter 15.
  • the adsorption filter 15 is with a storage medium for fuel vapor, filled with activated carbon in particular and used for Intermediate storage of from the fuel tank 3 volatilized fuel vapor.
  • the discharge nozzle 11 extends, for example, in the axial direction from the lower one Housing part 8 along a longitudinal axis 17 of the valve 1 and is for connecting a second hose line 18 intended.
  • the second hose line 18 opens for example downstream one rotatable in the intake pipe 4 housed throttle valve 19 in the intake manifold 4.
  • the Inflow nozzle 10 extends, for example, across Longitudinal axis 17 of the valve 1 and stands radially from the lower Housing part 8 from.
  • a magnet housing 26 Inside the basic housing 6 is in a magnet housing 26 an electromagnet 22 housed a cylindrical Excitation coil 23 and a magnetic core 37 has.
  • the Magnet housing 26 is sleeve-shaped and carries in inside the excitation coil 23, which on a to Example of plastic coil bobbin 27 is wound up.
  • the excitation coil 23 surrounds one of magnetic forces attractable, preferably metallic Armature 25 of the valve 1 to this in the energized state Excitation coil 23 against the force of a valve spring 50 move.
  • the armature 25 is in a in the basic housing 6 housed guide sleeve 24 axially displaceable stored.
  • the coil carrier 27 is at a radial distance an outer surface 39 of the smaller diameter guide sleeve 24 housed inside the base housing 6 and extends radially up to an inner wall 29 of the Magnetic housing 26.
  • the radial distance of the coil carrier 27 to the outer surface 39 of the guide sleeve 24 prevents Jamming of the armature 25 due to thermal expansion Example of the excitation coil 23.
  • the coil support 27 is located axially on an annular shoulder 28 of the guide sleeve 24 on.
  • the extension 28 of the guide sleeve 24 extends radially likewise up to the inner wall 29 of the magnet housing 26.
  • Between the shoulder 28 of the guide sleeve 24 and a radial circumferential web 30 of the basic housing 6 is for example still a contact disc 31 housed with radial Distance to an outer surface 33 of the armature 25 is arranged is.
  • the magnetic core 37 has for example, an externally threaded portion 38 which is in a Internal thread 40 engages in a sleeve-shaped Magnetic housing 26 covering magnetic base 35 is provided, to rotate the magnetic core 37 by rotating the magnetic core 37 to move axially accordingly, so that an adjustable Anchor stop for the anchor 25 is present.
  • the armature 25 is hollow cylindrical and has one Through opening 42 which extends in the axial direction from the Recess 36 at the end 32 of the top shown in Figure 1 Anchor 25 up to its located in the lower housing part 8 End 34 extends.
  • a Through opening 42 radially enlarging, rotating Paragraph 45 designed to be between Paragraph 45 and one recess 46 provided in the sleeve-shaped magnetic core 37 to record the valve spring 50.
  • the valve spring 50 supports on the one hand in the recess 46 on the magnetic core 37 and on the other hand on the shoulder 45 in the through opening 42 on anchor 25.
  • the armature is activated by means of the valve spring 50 25 in the de-energized state of the excitation coil 23 with its end 34 to one covered by an annular sealing ring 53 annular valve seat 54 pressed tightly so that a Flow connection 74 between inflow nozzle 10 and Outflow nozzle 11 is closed.
  • the valve seat 54 is on an end located inside the lower housing part 8 55 of the discharge nozzle 11 is provided and, as in the left the longitudinal axis 17 lying half of the valve 1 shown is tightly closed by the anchor 25.
  • the sealing ring 53 consists of an elastic material, for example rubber.
  • a Electronic control unit 80 is provided, which has a electrical line 81 and via a on the housing cover 7 integrally molded connector 82 with the Electromagnet 22 is electrically connected.
  • the electronic control unit 80 transmits the Electromagnets 22 a drive pulse train electrical voltage with a relatively high frequency of for example 100 Hertz.
  • the control pulse sequence is from the electronic control unit 80 with one from the control unit 80 variable duty cycle output.
  • the Duty cycle for example, gives the quotient as a percentage the pulse duration to the pulse interval (period) the successive impulses.
  • Such Control is known to the person skilled in the art as so-called pulse-width modulation known.
  • the excitation coil 23 preferably has an excitation winding that is almost constant Resistance value regardless of the temperature influences of the Has valve 1.
  • Such a, temperature compensated Excitation winding can for example consist of two windings be made up of different materials, whose resistance values are chosen so that a compensation the temperature dependence of the resistance value of both Windings.
  • a winding the excitation coil 23 consist of a material which a positive temperature coefficient (PTC thermistor) has and the other winding of one material exist, which has a negative temperature coefficient (NTC thermistor).
  • PTC thermistor positive temperature coefficient
  • NTC thermistor negative temperature coefficient
  • a such voltage pulse train can be technically in realize in a particularly simple manner, for example in Form of a transistor circuit, which the DC voltage source of a motor vehicle, for example the a starter battery, takes advantage of between two predetermined values, for example 12 volts and 0 volts, to switch back and forth accordingly.
  • Such Voltage pulse train causes one in the excitation coil 23 medium current, which is a magnetic field of certain strength induced to the armature 25 against the force of the valve spring 50 to move away from the valve seat 54 and into a certain bring axial position.
  • the axial end position of the armature 25 depends on the duty cycle applied Voltage pulse sequence.
  • the opening cross-section is designed so that the valve 1 has an exponential opening characteristic is awarded.
  • FIG 2 a sectional view along a line II-II in Figure 1, a first exemplary embodiment according to the invention is shown,
  • the metering opening 56 has a V-shape with a Cross-sectional area curved from two towards to converge towards the valve seat 54
  • Cross-sectional borders 75, 76 and a circular Arc section 77 is limited.
  • How the course B of the opening characteristic of 4 shows valve 1 according to the invention can be by designing the cross-sectional boundaries 75, 76 Get valve 1, the one with increasing duty cycle T. for example, exponentially increasing volume flow. Since the stroke H of the armature 25 from the duty cycle T of Control pulse sequence depends linearly, it follows that for Reduction of a relatively high volume flow only relatively little stroke of the armature 25 is required. Especially this results in extremely short switch-off times of for example a few milliseconds to the volume flow of valve 1, for example, to zero. In the area small duty cycles (e.g.
  • T less than 50% causes a small change in the duty cycle T only a small change in volume flow, which is however desirable is compared to a linear opening characteristic having valve (course A in Figure 4) a to obtain excellent small quantity dosing.
  • the Range of larger duty cycles e.g. T larger 50%
  • the metering opening 56 also be such that the cross-sectional borders 75, 76 have a curve shape which, based on the Coordinate axes x, y drawn in in FIG Cartesian coordinate system with a to the longitudinal axis 17th parallel x-axis, from an exponential function, especially a natural exponential function, is writable nature. They have Cross-sectional borders 75, 76 facing the valve seat 54 their closest distance or even theirs Point of contact, while increasing distance from Valve seat 54 also the distance of the cross-sectional boundaries 75, 76 increases with each other.
  • the maximum stroke H of the armature 25 can be such be set so that the armature 25 with its end face 73rd at maximum stroke, at most end points 85, 86 of Cross-sectional boundaries reached 75 and 76, respectively that the anchor 25 only a cross-sectional area of the Metering opening 56 with exponential cross-sectional boundaries 75, 76 releases.
  • Pressure equalization connection 70 also allows that in raised state of the armature 25 the negative pressure of the Intake pipe 4 both on the end face 73 of the armature 25 as well as on the opposite bottom surface 48 of the Recess 36 on armature 25 prevails.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetically Actuated Valves (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP96918613A 1995-10-27 1996-06-26 Ventil zum dosierten einleiten von aus einem brennstofftank einer brennkraftmaschine verflüchtigtem brennstoffdampf Expired - Lifetime EP0800621B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19540021A DE19540021A1 (de) 1995-10-27 1995-10-27 Ventil zum dosierten Einleiten von aus einem Brennstofftank einer Brennkraftmaschine verflüchtigtem Brennstoffdampf
DE19540021 1995-10-27
PCT/DE1996/001120 WO1997016640A1 (de) 1995-10-27 1996-06-26 Ventil zum dosierten einleiten von aus einem brennstofftank einer brennkraftmaschine verflüchtigtem brennstoffdampf

Publications (2)

Publication Number Publication Date
EP0800621A1 EP0800621A1 (de) 1997-10-15
EP0800621B1 true EP0800621B1 (de) 1998-12-02

Family

ID=7775927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96918613A Expired - Lifetime EP0800621B1 (de) 1995-10-27 1996-06-26 Ventil zum dosierten einleiten von aus einem brennstofftank einer brennkraftmaschine verflüchtigtem brennstoffdampf

Country Status (8)

Country Link
US (1) US5791318A (es)
EP (1) EP0800621B1 (es)
JP (1) JPH10512346A (es)
KR (1) KR980700514A (es)
CN (1) CN1166195A (es)
DE (2) DE19540021A1 (es)
ES (1) ES2126404T3 (es)
WO (1) WO1997016640A1 (es)

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WO2016035654A1 (ja) * 2014-09-01 2016-03-10 愛三工業株式会社 蒸発燃料処理装置
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Also Published As

Publication number Publication date
JPH10512346A (ja) 1998-11-24
DE19540021A1 (de) 1997-04-30
ES2126404T3 (es) 1999-03-16
WO1997016640A1 (de) 1997-05-09
CN1166195A (zh) 1997-11-26
KR980700514A (ko) 1998-03-30
US5791318A (en) 1998-08-11
EP0800621A1 (de) 1997-10-15
DE59600906D1 (de) 1999-01-14

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