EP0604285A1 - Elektrisch gesteuertes Ventil für Kanisterwiederaufbereitungssystem - Google Patents

Elektrisch gesteuertes Ventil für Kanisterwiederaufbereitungssystem Download PDF

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Publication number
EP0604285A1
EP0604285A1 EP93403081A EP93403081A EP0604285A1 EP 0604285 A1 EP0604285 A1 EP 0604285A1 EP 93403081 A EP93403081 A EP 93403081A EP 93403081 A EP93403081 A EP 93403081A EP 0604285 A1 EP0604285 A1 EP 0604285A1
Authority
EP
European Patent Office
Prior art keywords
valve
canister
chamber
solenoid
core
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.)
Granted
Application number
EP93403081A
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English (en)
French (fr)
Other versions
EP0604285B1 (de
Inventor
Henri Mazet
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.)
Marelli France SAS
Original Assignee
Solex SA
Magneti Marelli France SAS
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 Solex SA, Magneti Marelli France SAS filed Critical Solex SA
Publication of EP0604285A1 publication Critical patent/EP0604285A1/de
Application granted granted Critical
Publication of EP0604285B1 publication Critical patent/EP0604285B1/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
    • 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
    • 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 relates to a valve with electrical control of a canister regeneration circuit, for an internal combustion engine supplied with air or with carburetted air by at least one intake duct in which the flow is controlled by a shutter, for example of the type rotary.
  • the invention relates to a proportional valve with continuous flow, controlled by an electrical setpoint signal, for a canister regeneration circuit associated with an internal combustion engine, the fuel supply installation of which can either include a carburetor, including the rotary shutter, or throttle valve, controls the flow of carburetted air or air-fuel mixture, or be of the so-called "injection" type and comprise a throttle body, including the rotary shutter controls the intake air flow.
  • these fuel vapors are collected by a recovery line, which brings them to the canister, produced under the form of a receptacle containing means for absorbing these fuel vapors, for example a charge of activated carbon, fulfilling the role of a sponge and a filter with respect to the vapor fuel which reaches the canister .
  • the latter is provided with a vent in communication with the atmosphere, so that the fuel tank is vented through the canister.
  • the canister regeneration circuit includes a pipe connecting the canister to the intake pipe, downstream of the rotary shutter, and a valve mounted on this pipe.
  • valve of the regeneration circuit is an electrically controlled valve ensuring a modulation of the regeneration flow of the canister, which flow is difficult to know, because the fuel load collected in the canisters cannot be known with precision and depends on many parameters, such as the ambient temperature, whether or not resulting from the operation of the engine, the temperature and conditions for filling the fuel tank, etc.
  • valves comprising a calibrator with a constant passage section, and a flow control valve in the regeneration pipe, this valve being linked in movement to a core of a solenoid, the coil of which is supplied by an electric current for controlling the position of the valve.
  • the variation of the flow rate is obtained by modulating the cross section of the calibration subjected to the vacuum of the motor, this modulation being ensured by the valve which is that of a solenoid valve, that is to say a electromagnetic valve operating in all-or-nothing mode, but the solenoid coil of which is supplied with electric current with rectangular slots with variable opening duty cycle. That is to say that the opening time, for a constant period, corresponds to a variable fraction of this period, corresponding to the length of the current time slot used.
  • low frequency solenoid valves excited at constant frequencies ranging from 5 to 20 Hz have been used. These frequencies correspond to constant periods ranging from 200 to 50 ms. If the opening duty cycle is 10%, this results in a length of the rectangular slot of corresponding current, and therefore substantially a duration of opening of the valve ranging from 20 to 5 ms. As a result, the duration of opening of the solenoid valve, and therefore the duration of aspiration of the canister regeneration fuel in the intake duct, extends from approximately a quarter to approximately three quarter turns of the engine. The consequence is that this regeneration fuel cannot be allowed in all the engine cylinders.
  • an object of the invention is to provide an electrically controlled valve making it possible to spread the regeneration flow so that all the cylinders of the engine receive substantially the same fraction. canister regeneration fuel.
  • Another object of the invention is to propose an electrically controlled valve making it possible to ensure a regenerative flow rate of the canister which is continuous, but modulated and slaved to an electrical setpoint signal, so as to obtain a valve with flow rate proportional to this instruction.
  • the idea underlying the invention consists in modulating the regeneration flow rate of the canister by passing this flow rate through a calibrator with a constant passage section, but which is subjected to a modulated vacuum, unlike the solenoid valves of the 'state of the art, in which we modulate the effective section of the calibration subjected to engine vacuum.
  • the electrically controlled valve according to the invention for a canister regeneration circuit of the type presented above, comprising a pipe connecting the canister to the intake duct, downstream of the shutter, and on which is mounted the valve which comprises a calibrator with constant passage section, a flow control valve in the pipeline and which is linked in movement to a core of a solenoid whose coil is supplied by an electric current to control the force on the valve, is characterized in that the valve is integral in movement with a flexible membrane, which delimits in a housing two chambers, one of which is maintained at a pressure close to or equal to atmospheric pressure, and the second of which is a modulated vacuum chamber, containing the valve and placed in communication, by an inlet orifice, with the canister by through said calibrator, and through an outlet orifice with the intake duct, the membrane thus subjected to a depression close to or equal to that which acts on the calibrator also being subjected to the opposing forces of elastic means, which tend to close the valve on the outlet, and the solenoi
  • variable mean control current is obtained by supplying the solenoid coil with rectangular electrical current slots with variable duty cycle.
  • variable mean control current will advantageously be controlled by a control member sensitive to at least one signal from at least one sensor of an engine operating parameter, such as a richness sensor of the air-fuel mixture, this control member being the carburetor control computer or the engine control system computer.
  • the valve can be linked in movement to the core of the solenoid by means of reduction of the amplitude of the movement of the valve relative to the amplitude of the movement of the core, in order to best adapt each of these movements to practical needs.
  • the valve in order to reduce the cost of producing the valve as well as its size, it is advantageous that, according to a simplified structure, the valve be directly integral in movement with the core of the solenoid, the valve and the core being arranged on either side. other of the membrane.
  • the valve is in one piece with the core, which extends partially in the first chamber, and the elastic means comprise at least one return spring, housed in this first chamber, and produced under the shape of a helical spring partially surrounding, and preferably substantially coaxially the core.
  • the first chamber can be maintained at atmospheric pressure or at canister pressure, which is little different from atmospheric pressure.
  • the first chamber is in communication with the canister by an inlet orifice and has an outlet orifice in communication with the inlet orifice of the second chamber through the calibrator.
  • a continuous flow valve modulated by the modulation of the average control current passing through the solenoid coil is thus obtained, the valve being compact and easy to assemble, since it suffices to connect the inlet orifice of its first chamber to the canister and the outlet of its second chamber to the intake duct, and to ensure the electrical supply of the solenoid by the control current.
  • the canister 1 with an internal volume generally substantially equal to the engine displacement, contains an absorbent or adsorbent load 2, for example of activated carbon, which takes charge of the fuel vapors, coming in particular from the tank of fuel, and which are brought to the canister 1 by the recovery line 3.
  • the canister 1 can thus contain for example 100 g of fuel.
  • vent 4 connecting it to the atmosphere, and is also connected to the intake duct 5 of a carburetor body or of a throttle body of an internal combustion engine, downstream of the '' rotary shutter or throttle valve 6, the angular position of which in the intake duct 5 is controlled to regulate the air intake rate, in the case of a throttle body, or of air carburetor in the case of a carburetor.
  • This connection of the canister 1 to the intake duct 5 is ensured by a circuit 7 for regenerating the canister 1, this circuit 7 comprising a regeneration line 8 opening, at its entry into the canister 1 and, at its exit, into the intake duct 5, as well as an electrically controlled valve 9, connected between the upstream 8a and downstream 8b branches of the pipe 8.
  • the valve 9, two embodiments of which are shown in FIGS. 2 and 3, is a check valve whose position is controlled by a solenoid receiving its electric control current from a control device schematically represented at 10.
  • a solenoid receiving its electric control current from a control device schematically represented at 10.
  • the valve 9 comprises a body or housing 11 the interior of which is subdivided by a flexible waterproof membrane 12 which can be deformed into two chambers 13 and 14, the first of which 13 is maintained at atmospheric pressure.
  • the second chamber 14 has an inlet 15 connected to the upstream part 8a of the pipeline 8 for regenerating the canister 1 by a tubular nozzle 16 containing a calibrator 17 or restriction, with a constant passage section.
  • the second chamber 14 also has an outlet orifice 18 connected to the downstream part 8b of the regeneration pipe 8, and the periphery of the outlet orifice 18 constitutes a seat for the conical head of a valve 19.
  • This valve 19 with a cylindrical body, is in one piece with the core 20, also cylindrical, of a solenoid comprising an excitation coil 21 mounted on the body 11, outside the first chamber 13, on the side opposite to the outlet orifice 18.
  • the monobloc assembly of the valve 19 and of the core 20 is integral with the membrane 12, of which it crosses the central part with sealing.
  • the valve 19 is thus supported by the membrane 12 in the second chamber 14, while the core 20, on the other side of the membrane 12, extends partly in the first chamber 13 and partly outside of the latter, in the coil 21.
  • the part of the core 20 located in the chamber 13 is surrounded by a helical return spring 22 bearing on the housing 11 and on the membrane 12 to tend to push it in the direction applying the valve 19 to its seat, so as to close the outlet 18 when the coil 21 is not supplied.
  • the housing 11, the membrane 12, the one-piece valve 19-core assembly 20, the coil 21 and the outlet orifice 18 are, to ensure better mechanical behavior of the valve assembly 19-core 20, preferably coaxial with the longitudinal axis of this assembly.
  • the coil 21 is traversed by an average electric control current, which results from the supply of rectangular slots of current with variable duty cycle.
  • the valve assembly 19-core 20 is then subjected to an electromagnetic force Fm which separates the valve 19 from the outlet orifice 18, against the spring 22.
  • the chamber 14 is then in communication via the outlet 18 with the intake duct 5 and, through the calibrator 17, with the upstream pipe 8a and the canister 1.
  • the control pressure Pc in the chamber 14 is then intermediate between the pressure of the canister Pcan, upstream of the calibrator 17, it- same close to atmospheric pressure Pa in chamber 13, and pressure in the intake duct 5, downstream of the butterfly valve 6.
  • the membrane 12 is subjected to the return force Fr of the spring 22, which tends to close the valve 19 on the outlet 18, to an electromagnetic force Fm exerted on the core 20 by the field created by the coil 21, and to the force resulting from the application, on the effective surface S of the membrane 12, of the differential pressure between the atmospheric pressure Pa in the chamber 13 and the control pressure Pc in the chamber 14.
  • the regeneration rate Q passing through the calibrator 17 is given by the known formula (2) below:
  • Q Sc x [2 ⁇ (Pcan - Pc)], or Sc is the constant passage section of the calibrator 17, ⁇ the density of the air-fuel mixture from canister 1, and Pcan and Pc are respectively the pressure in the canister or upstream of the calibrator 17, and the control pressure in the chamber 14.
  • the regeneration flow rate Q is independent of Pcan, continuous and modulated by the modulation of the electromagnetic force Fm, itself a function of the mean control current of the coil 21.
  • the valve is thus of continuous and proportional flow, subject to an electrical current setpoint.
  • a spring 22 with a low force threshold is chosen.
  • FIG. 3 The example of a valve in FIG. 3 is essentially distinguished from that of FIG. 2 only by the following differences: the housing 11 ′ has a lateral passage 23, connecting the two chambers 13 and 14 to each other, and in which the calibrator 17 is mounted.
  • the upstream part 8a of the regeneration pipe is no longer connected to the chamber 14 through the calibrator 17, but to an inlet orifice 24 of the chamber 13, having an orifice for outlet 25 in communication with the inlet orifice 15 of the chamber 14 via the calibrator 17.
  • the chamber 13 is no longer maintained at atmospheric pressure but directly at the pressure of the canister Pcan.
  • there is the solenoid with coil 21 and plunger 20 in one piece with the valve 19 and integral in movement with the membrane 12 urged in the direction of closing of the valve 19 on the outlet orifice 18 of the chamber 14 by the return spring 22.
  • This electric current is supplied for example by a control computer of a carburetor or a computer of an engine control system, and developed from information coming in particular from a richness probe, of the ⁇ probe type, detecting the oxygen content in engine exhaust.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Magnetically Actuated Valves (AREA)
EP19930403081 1992-12-21 1993-12-17 Elektrisch gesteuertes Ventil für Kanisterwiederaufbereitungssystem Expired - Lifetime EP0604285B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9215362 1992-12-21
FR9215362A FR2699603B1 (fr) 1992-12-21 1992-12-21 Vanne à commande électrique de circuit de régénération de canister.

Publications (2)

Publication Number Publication Date
EP0604285A1 true EP0604285A1 (de) 1994-06-29
EP0604285B1 EP0604285B1 (de) 1997-01-22

Family

ID=9436827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930403081 Expired - Lifetime EP0604285B1 (de) 1992-12-21 1993-12-17 Elektrisch gesteuertes Ventil für Kanisterwiederaufbereitungssystem

Country Status (4)

Country Link
EP (1) EP0604285B1 (de)
DE (1) DE69307676T2 (de)
ES (1) ES2096254T3 (de)
FR (1) FR2699603B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030640A1 (en) * 1995-03-31 1996-10-03 Siemens Electric Limited Canister purge flow regulator
WO1999010646A1 (en) * 1997-08-25 1999-03-04 Siemens Canada Limited Automotive emission control valve with a counter-force mechanism
WO1999015775A1 (de) * 1997-09-24 1999-04-01 Robert Bosch Gmbh Ventileinrichtung
WO2001077515A1 (en) * 2000-04-05 2001-10-18 Siemens Automotive Inc. Pressure operable device for an integrated pressure management apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753747B1 (fr) * 1996-09-26 1998-11-27 Vanne a commande electrique et a ouverture continue en fonctionnement, pour regeneration d'un collecteur de vapeurs de carburant
WO2004079467A1 (en) 2003-03-07 2004-09-16 Siemens Vdo Automotive Inc. An improved integrated pressure management apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913545A (en) * 1973-04-04 1975-10-21 Ford Motor Co Evaporative emission system
US4013054A (en) * 1975-05-07 1977-03-22 General Motors Corporation Fuel vapor disposal means with closed control of air fuel ratio
US4086897A (en) * 1976-12-28 1978-05-02 Toyota Jidosha Kogyo Kabushiki Kaisha Evaporated fuel feed control device for an internal combustion engine
DE3418392A1 (de) * 1983-05-20 1984-12-20 Aisin Seiki K.K., Kariya, Aichi Steuerventil
US4809667A (en) * 1986-10-29 1989-03-07 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling amount of fuel-vapor purged from canister to intake air system
EP0361654A1 (de) * 1988-09-01 1990-04-04 Ford Motor Company Limited Regelsystem für Brennstoffeinspritzung
US4951643A (en) * 1987-09-16 1990-08-28 Nippondenso Co., Ltd. Fuel vapor treatment apparatus
FR2671597A1 (fr) * 1991-01-16 1992-07-17 Eaton Sa Monaco Electrovanne a section de passage variable.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913545A (en) * 1973-04-04 1975-10-21 Ford Motor Co Evaporative emission system
US4013054A (en) * 1975-05-07 1977-03-22 General Motors Corporation Fuel vapor disposal means with closed control of air fuel ratio
US4086897A (en) * 1976-12-28 1978-05-02 Toyota Jidosha Kogyo Kabushiki Kaisha Evaporated fuel feed control device for an internal combustion engine
DE3418392A1 (de) * 1983-05-20 1984-12-20 Aisin Seiki K.K., Kariya, Aichi Steuerventil
US4809667A (en) * 1986-10-29 1989-03-07 Toyota Jidosha Kabushiki Kaisha Apparatus for controlling amount of fuel-vapor purged from canister to intake air system
US4951643A (en) * 1987-09-16 1990-08-28 Nippondenso Co., Ltd. Fuel vapor treatment apparatus
EP0361654A1 (de) * 1988-09-01 1990-04-04 Ford Motor Company Limited Regelsystem für Brennstoffeinspritzung
FR2671597A1 (fr) * 1991-01-16 1992-07-17 Eaton Sa Monaco Electrovanne a section de passage variable.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030640A1 (en) * 1995-03-31 1996-10-03 Siemens Electric Limited Canister purge flow regulator
CN1068414C (zh) * 1995-03-31 2001-07-11 西门子电气有限公司 容器清洗气流的控制装置
WO1999010646A1 (en) * 1997-08-25 1999-03-04 Siemens Canada Limited Automotive emission control valve with a counter-force mechanism
WO1999015775A1 (de) * 1997-09-24 1999-04-01 Robert Bosch Gmbh Ventileinrichtung
US6470908B1 (en) 1999-11-19 2002-10-29 Siemens Canada Limited Pressure operable device for an integrated pressure management apparatus
WO2001077515A1 (en) * 2000-04-05 2001-10-18 Siemens Automotive Inc. Pressure operable device for an integrated pressure management apparatus

Also Published As

Publication number Publication date
DE69307676D1 (de) 1997-03-06
ES2096254T3 (es) 1997-03-01
FR2699603A1 (fr) 1994-06-24
EP0604285B1 (de) 1997-01-22
FR2699603B1 (fr) 1995-03-10
DE69307676T2 (de) 1997-09-04

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