EP0604285B1 - Electrically actuated canister circuit regeneration valve - Google Patents
Electrically actuated canister circuit regeneration valve Download PDFInfo
- Publication number
- EP0604285B1 EP0604285B1 EP19930403081 EP93403081A EP0604285B1 EP 0604285 B1 EP0604285 B1 EP 0604285B1 EP 19930403081 EP19930403081 EP 19930403081 EP 93403081 A EP93403081 A EP 93403081A EP 0604285 B1 EP0604285 B1 EP 0604285B1
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- EP
- European Patent Office
- Prior art keywords
- valve
- canister
- chamber
- core
- poppet valve
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- 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.)
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Classifications
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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
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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
- 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 (US-A-4,809,667).
- 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 the effective cross section of the calibration subjected to engine vacuum is modulated.
- 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 is 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.
- 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 provided by a circuit 7 for regeneration of 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 the latter 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 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.
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- 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)
Description
L'invention concerne une vanne à commande électrique de circuit de régénération de canister, pour moteur à combustion interne alimenté en air ou en air carburé par au moins un conduit d'admission dans lequel le débit est commandé par un obturateur, par exemple du type rotatif (US-A-4 809 667).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 (US-A-4,809,667).
Plus précisément, l'invention se rapporte à une vanne proportionnelle à débit continu, asservie à un signal de consigne électrique, pour un circuit de régénération du canister associé à un moteur à combustion interne, dont l'installation d'alimentation en combustible peut soit comporter un carburateur, dont l'obturateur rotatif, ou papillon des gaz, commande le débit d'air carburé ou de mélange air-combustible, soit être du type dit "à injection" et comporter un corps de papillon, dont l'obturateur rotatif commande le débit d'air d'admission.More specifically, 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.
Afin que les véhicules automobiles satisfassent aux normes actuelles d'anti-pollution relatives aux émissions de vapeurs de carburant ou combustible, que le moteur à combustion interne dont ils sont équipés soit en fonctionnement ou à l'arrêt, il est connu de recueillir dans un réceptacle appelé canister les vapeurs de combustible provenant de divers organes contenant ou parcourus par du combustible, dans le circuit suivi par ce dernier dans le véhicule et son moteur. Sur les véhicules équipés d'une installation d'alimentation en combustible par injection, des vapeurs de combustible proviennent en particulier du réservoir de combustible. Mais d'une manière générale, des vapeurs de combustible, peuvent également provenir du moteur, des tubulures d'injection et des injecteurs, ou, le cas échéant, du carburateur.In order for motor vehicles to meet current anti-pollution standards relating to the emission of fuel or combustible vapors, whether the internal combustion engine with which they are equipped is in operation or stopped, it is known to collect in a receptacle called canister fuel vapors from various organs containing or traversed by fuel, in the circuit followed by the latter in the vehicle and its engine. On vehicles fitted with an injection fuel supply system, fuel vapors come in particular from the fuel tank. However, in general, fuel vapors can also come from the engine, the injection pipes and the injectors, or, where appropriate, from the carburetor.
Pour éviter leur rejet dans l'air ambiant, ces vapeurs de combustible sont collectées par une conduite de récupération, qui les amène au canister, réalisé sous la forme d'un réceptacle contenant des moyens d'absorption de ces vapeurs de combustible, par exemple une charge de charbon actif, remplissant le rôle d'une éponge et d'un filtre vis-à-vis du carburant en vapeur qui parvient au canister. Ce dernier est muni d'un évent en communication avec l'atmosphère, de sorte que le réservoir de combustible est mis à l'air libre au travers du canister.To avoid their rejection in the ambient air, 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.
Pour éviter que le canister rejette du combustible à l'air libre par son évent, lorsqu'il est saturé en combustible, il est connu de le régénérer cycliquement. A cet effet, il est connu d'utiliser un circuit de régénération du canister, qui purge de temps en temps ce dernier du combustible qu'il a absorbé, et transmet ce combustible au moteur. Le circuit de régénération du canister comprend une canalisation raccordant le canister au conduit d'admission, en aval de l'obturateur rotatif, et une vanne montée sur cette canalisation. Lorsque la vanne est ouverte, la dépression régnant en aval de l'obturateur rotatif dans le conduit d'admission provoque dans la canalisation et dans le canister une aspiration d'air ambiant par l'évent du canister, et cet air ambiant aspiré purge ainsi le canister du combustible qu'il contient et se mélange à ce combustible pour être aspiré avec lui en aval de l'obturateur rotatif dans le conduit d'admission. On comprend que l'arrivée de cet air carburé vient modifier la richesse du mélange air-combustible préparé par des organes appropriés du moteur (carburateur ou injecteur selon le cas) recevant des ordres de commande élaborés à partir de signaux provenant de différents capteurs de paramètres de fonctionnement du moteur, et en particulier d'une sonde dite λ, ou sonde mesurant le taux d'oxygène dans les gaz d'échappement.To prevent the canister from rejecting fuel in the open air through its vent, when it is saturated with fuel, it is known to regenerate it cyclically. To this end, it is known to use a canister regeneration circuit, which purges the fuel from time to time of the fuel it has absorbed, and transmits this fuel to the engine. 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. When the valve is open, the vacuum prevailing downstream of the rotary shutter in the intake duct causes in the pipe and in the canister a suction of ambient air through the canister vent, and this ambient air sucked in thus purges the canister of the fuel it contains and mixes with this fuel to be sucked with it downstream of the rotary shutter in the intake duct. We understand that the arrival of this fuel air changes the richness of the air-fuel mixture prepared by appropriate engine parts (carburetor or injector as appropriate) receiving control commands developed from signals from different parameter sensors of engine operation, and in particular of a so-called λ probe, or probe measuring the oxygen level in the exhaust gases.
Afin d'éliminer cette perturbation de la richesse, il a déjà été proposé que la vanne du circuit de régénération soit une vanne à commande électrique assurant une modulation du débit de régénération du canister, lequel débit est difficile à connaître, car la charge de combustible recueillie dans les canisters ne peut pas être connue avec précision et dépend de nombreux paramètres, tels que la température ambiante, résultant ou non du fonctionnement du moteur, la température et les conditions de remplissage du réservoir de combustible, etc ...In order to eliminate this perturbation of the richness, it has already been proposed that the 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.
A cet effet, les vannes à commande électrique usuellement utilisées sont des vannes comprenant un calibreur à section de passage constante, et un clapet de commande du débit dans la canalisation de régénération, ce clapet étant lié en mouvement à un noyau d'un solénoïde, dont la bobine est alimentée par un courant électrique de commande de la position du clapet.To this end, the electrically operated valves usually used are 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.
Dans ces vannes de type traditionnel, la variation du débit est obtenue en modulant la section efficace du calibrage soumis à la dépression du moteur, cette modulation étant assurée par le clapet qui est celui d'une électrovanne, c'est-à-dire une soupape électro-magnétique fonctionnant en tout-ou-rien, mais dont la bobine du solénoïde est alimentée en courant électrique à créneaux rectangulaires à rapport cyclique d'ouverture variable. C'est-à-dire que le temps d'ouverture, pour une période constante, correspond à une fraction variable de cette période, correspondant à la longueur du créneau de courant utilisé.In these traditional type valves, 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.
Pour un moteur tournant à 3000 t/mn par exemple, un demi tour est parcouru en 10 ms.For an engine running at 3000 rpm for example, a half turn is covered in 10 ms.
Dans les réalisations de l'état de la technique, on a utilisé des électrovannes basse fréquence excitées à des fréquences constantes allant de 5 à 20 Hz. Il correspond à ces fréquences des périodes constantes allant de 200 à 50 ms. Si le rapport cyclique d'ouverture est de 10 %, il en résulte une longueur du créneau rectangulaire de courant correspondant, et donc sensiblement une durée d'ouverture du clapet allant de 20 à 5 ms. Il en résulte que la durée d'ouverture de l'électrovanne, et donc la durée d'aspiration du combustible de régénération du canister dans le conduit d'admission, s'étend sur environ un quart à environ trois quarts de tour du moteur. La conséquence est que ce combustible de régénération ne peut pas être admis dans tous les cylindres du moteur.In the embodiments of the state of the art, 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.
L'utilisation d'électrovannes à basse fréquence pour la régénération des canisters a donc pour inconvénient d'entraîner un déséquilibre dans l'alimentation des cylindres du moteur.The use of low frequency solenoid valves for the regeneration of canisters therefore has the drawback of causing an imbalance in the supply of the engine cylinders.
Pour remédier à cet inconvénient, il a été envisagé d'utiliser des électrovannes à haute fréquence, mais leur usure rapide liée à leur fréquence élevée de fonctionnement, et leur coût élevé les ont fait écarter.To overcome this drawback, it has been envisaged to use high-frequency solenoid valves, but their rapid wear linked to their high operating frequency, and their high cost have caused them to be excluded.
Par l'invention, on se propose de remédier à ces inconvénients, et un but de l'invention est de réaliser une vanne à commande électrique permettant d'étaler le débit de régénération de sorte que tous les cylindres du moteur reçoivent sensiblement la même fraction du combustible de régénération du canister.By the invention, it is proposed to remedy these drawbacks, and 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.
Un autre but de l'invention est de proposer une vanne à commande électrique permettant d'assurer un débit de régénération du canister qui est continu, mais modulé et asservi à un signal de consigne électrique, de façon à obtenir une vanne à débit proportionnel à cette consigne.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.
L'idée à la base de l'invention consiste à moduler le débit de régénération du canister en faisant passer ce débit au travers d'un calibreur à section de passage constante, mais qui est soumis à une dépression modulée, contrairement aux électrovannes de l'état de la technique, dans lesquelles on module la section efficace du calibrage soumis à la dépression moteur.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 the effective cross section of the calibration subjected to engine vacuum is modulated.
A cet effet, la vanne à commande électrique selon l'invention, pour un circuit de régénération de canister du type présenté ci-dessus, comprenant une canalisation raccordant le canister au conduit d'admission, en aval de l'obturateur, et sur laquelle est montée la vanne qui comprend un calibreur à section de passage constante, un clapet de commande du débit dans la canalisation et qui est lié en mouvement à un noyau d'un solénoïde dont la bobine est alimentée par un courant électrique pour commander l'effort sur le clapet, se caractérise en ce que le clapet est solidaire en mouvement d'une membrane souple, qui délimite dans un boîtier deux chambres, dont une première est maintenue à une pression voisine de ou égale à la pression atmosphérique, et dont la seconde est une chambre à dépression modulée, renfermant le clapet et mise en communication, par un orifice d'entrée, avec le canister par l'intermédiaire dudit calibreur, et par un orifice de sortie avec le conduit d'admission, la membrane ainsi soumise à une dépression voisine de ou égale à celle qui agit sur le calibreur étant également soumise aux efforts antagonistes de moyens élastiques, qui tendent à fermer le clapet sur l'orifice de sortie, et du solénoïde, dont la bobine crée une force ayant pour effet d'écarter le clapet de l'orifice de sortie pour ouvrir ce dernier, lorsqu'elle est parcourue par un courant moyen variable constituant un signal de consigne électrique fixant l'effort sur le clapet.To this end, 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 solenoid, the coil of which creates a force having the effect of moving the valve from the outlet to open the latter, when is traversed by a variable average current constituting an electrical reference signal fixing the force on the valve.
On comprend qu'en fonctionnement, la membrane est en équilibre sous les actions combinées de la dépression, qui détermine le débit, des moyens élastiques, qui tendent à rappeler le clapet en position de fermeture, et de l'effort dû au solénoïde, et donc du courant qui traverse sa bobine. On établit ainsi une relation entre la dépression, et donc le débit, d'une part, et, d'autre part, le courant électrique moyen qui parcourt la bobine du solénoïde. Cette vanne permet ainsi de moduler le débit de régénération de façon continue par l'intermédiaire d'une dépression variable déterminée à l'aide d'un courant moyen de commande.It is understood that in operation, the membrane is in equilibrium under the combined actions of depression, which determines the flow, elastic means, which tend to return the valve in the closed position, and of the force due to the solenoid, and therefore current flowing through its coil. A relationship is thus established between the vacuum, and therefore the flow, on the one hand, and, on the other hand, the average electric current which flows through the solenoid coil. This valve thus makes it possible to modulate the regeneration flow continuously by means of a variable vacuum determined using an average control current.
Avantageusement, le courant moyen variable de commande est obtenu en alimentant la bobine de solénoïde par des créneaux de courant électrique rectangulaires à rapport cyclique variable.Advantageously, the variable mean control current is obtained by supplying the solenoid coil with rectangular electrical current slots with variable duty cycle.
Pour un moteur alimenté par un carburateur piloté par un calculateur, ou alimenté par une installation d'injection pilotée par un système de contrôle moteur, le courant moyen variable de commande sera avantageusement piloté par un organe de commande sensible à au moins un signal provenant d'au moins un capteur d'un paramètre de fonctionnement du moteur, tel qu'un capteur de richesse du mélange air-combustible, cet organe de commande étant le calculateur de pilotage du carburateur ou le calculateur du système de contrôle moteur.For an engine powered by a carburetor controlled by a computer, or powered by an installation injection controlled by an engine control system, the 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.
Le clapet peut être lié en mouvement au noyau du solénoïde par des moyens de démultiplication de l'amplitude du déplacement du clapet par rapport à l'amplitude du déplacement du noyau, afin d'adapter au mieux chacun de ces déplacements aux besoins pratiques. Mais, pour diminuer le coût de réalisation de la vanne ainsi que son encombrement, il est avantageux que, selon une structure simplifiée, le clapet soit directement solidaire en mouvement du noyau du solénoïde, le clapet et le noyau étant disposés de part et d'autre de la membrane.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. However, 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 is directly integral in movement with the core of the solenoid, the valve and the core being arranged on either side. other of the membrane.
Dans un mode de réalisation préféré, le clapet est d'une seule pièce avec le noyau, qui s'étend partiellement dans la première chambre, et les moyens élastiques comprennent au moins un ressort de rappel, logé dans cette première chambre, et réalisé sous la forme d'un ressort hélicoïdal entourant partiellement, et de préférence sensiblement coaxialement le noyau. On obtient ainsi un meilleur guidage de l'ensemble clapet-noyau dans ses déplacements selon son axe longitudinal, qui est également celui du ressort hélicoïdal et avantageusement de la bobine du solénoïde, ainsi que des sollicitations plus équilibrées de la membrane.In a preferred embodiment, 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. This gives better guidance of the valve-core assembly in its movements along its longitudinal axis, which is also that of the helical spring and advantageously of the solenoid coil, as well as more balanced stresses on the membrane.
La première chambre peut être maintenue à la pression atmosphérique ou à la pression du canister, laquelle est peu différente de la pression atmosphérique. Dans ce second cas, la première chambre est en communication avec le canister par un orifice d'entrée et présente un orifice de sortie en communication avec l'orifice d'entrée de la seconde chambre par l'intermédiaire du calibreur.The first chamber can be maintained at atmospheric pressure or at canister pressure, which is little different from atmospheric pressure. In this second case, 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.
On obtient ainsi une vanne à débit continu et modulé par la modulation du courant moyen de commande parcourant la bobine du solénoïde, la vanne étant compacte et facile à monter, puisqu'il suffit de raccorder l'orifice d'entrée de sa première chambre au canister et l'orifice de sortie de sa seconde chambre au conduit d'admission, et d'assurer l'alimentation électrique du solénoïde par le courant de commande.This gives a continuous flow valve modulated by modulating the average control current flowing through the solenoid coil, the valve being compact and easy to mount, since it suffices to connect the inlet port 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.
D'autres avantages de l'invention ressortiront de la description donnée ci-dessous, d'exemples de réalisation décrits en référence aux dessins annexés sur lesquels :
- la figure 1 représente schématiquement un circuit de régénération de canister, comprenant la vanne selon l'invention, et monté entre un canister et un conduit d'admission d'un carburateur ou corps de papillon de moteur à combustion interne,
- la figure 2 est une vue schématique en coupe d'un premier exemple de vanne, et
- la figure 3 est une vue analogue à la figure 2 d'un second exemple de vanne.
- FIG. 1 schematically represents a canister regeneration circuit, comprising the valve according to the invention, and mounted between a canister and an intake duct of a carburetor or throttle body of an internal combustion engine,
- FIG. 2 is a schematic sectional view of a first example of a valve, and
- Figure 3 is a view similar to Figure 2 of a second example of a valve.
Sur la figure 1, le canister 1, d'un volume interne généralement sensiblement égal à la cylindrée du moteur, renferme une charge absorbante ou adsorbante 2, par exemple de charbon actif, qui se charge des vapeurs du combustible, provenant en particulier du réservoir de combustible, et qui sont amenées au canister 1 par la conduite de récupération 3. Le canister 1 peut ainsi contenir par exemple 100 g de combustible. Il est muni d'un évent 4 le reliant à l'atmosphère, et est également raccordé au conduit d'admission 5 d'un corps de carburateur ou d'un corps de papillon d'un moteur à combustion interne, en aval de l'obturateur rotatif ou papillon 6, dont la position angulaire dans le conduit d'admission 5 est commandée pour réguler le débit d'admission d'air, dans le cas d'un corps de papillon, ou d'air carburé dans le cas d'un carburateur. Ce raccordement du canister 1 au conduit d'admission 5 est assuré par un circuit 7 de régénération du canister 1, ce circuit 7 comprenant une canalisation de régénération 8 débouchant, à son entrée, dans le canister 1 et, à sa sortie, dans le conduit d'admission 5, ainsi qu'une vanne 9 à commande électrique, raccordée entre les branches amont 8a et aval 8b de la canalisation 8. La vanne 9, dont deux exemples de réalisation sont représentés sur les figures 2 et 3, est une vanne à clapet dont la position est commandée par un solénoïde recevant son courant électrique de commande d'un dispositif de commande schématiquement représenté en 10. Lorsque la vanne 9 est ouverte, la dépression régnant dans le conduit d'admission 5 en aval du papillon 6 provoque, au travers de la canalisation 8 et du canister 1, une aspiration d'air ambiant par l'évent 4, et cet air aspiré en traversant la charge 2 entraîne le combustible retenu par cette dernière dans le conduit d'admission.In FIG. 1, 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
Dans l'exemple de la figure 2, la vanne 9 comprend un corps ou boîtier 11 dont l'intérieur est subdivisé par une membrane 12 étanche souple et déformable en deux chambres 13 et 14, dont la première 13 est maintenue à la pression atmosphérique. La seconde chambre 14 présente un orifice d'entrée 15 raccordé à la partie amont 8a de la canalisation 8 de régénération du canister 1 par un embout tubulaire 16 renfermant un calibreur 17 ou restriction, à section de passage constante. La seconde chambre 14 présente également un orifice de sortie 18 raccordé à la partie aval 8b de la canalisation de régénération 8, et la périphérie de l'orifice de sortie 18 constitue un siège pour la tête conique d'un clapet 19. Ce clapet 19, à corps cylindrique, est d'une seule pièce avec le noyau 20, également cylindrique, d'un solénoide comprenant une bobine d'excitation 21 montée sur le corps 11, à l'extérieur de la première chambre 13, du côté opposé à l'orifice de sortie 18. L'ensemble monobloc du clapet 19 et du noyau 20 est solidaire de la membrane 12, dont il traverse avec étanchéité la partie centrale. Le clapet 19 est ainsi supporté par la membrane 12 dans la seconde chambre 14, tandis que le noyau 20, de l'autre côté de la membrane 12, s'étend en partie dans la première chambre 13 et en partie à l'extérieur de celle-ci, dans la bobine 21. La partie du noyau 20 située dans la chambre 13 est entourée d'un ressort de rappel hélicoïdal 22 prenant appui sur le boîtier 11 et sur la membrane 12 pour tendre à repousser celle-ci dans le sens appliquant le clapet 19 vers son siège, de façon à fermer l'orifice de sortie 18 lorsque la bobine 21 n'est pas alimentée. Le boîtier 11, la membrane 12, l'ensemble monobloc clapet 19-noyau 20, la bobine 21 et l'orifice de sortie 18 sont, pour assurer un meilleur comportement mécanique de l'ensemble clapet 19-noyau 20, de préférence coaxiaux à l'axe longitudinal de cet ensemble.In the example of FIG. 2, the
En fonctionnement, la bobine 21 est parcourue par un courant électrique moyen de commande, qui résulte de l'alimentation en créneaux rectangulaires de courant à rapport cyclique variable. L'ensemble clapet 19-noyau 20 est alors soumis à une force électromagnétique Fm qui écarte le clapet 19 de l'orifice de sortie 18, à l'encontre du ressort 22. La chambre 14 est alors en communication par la sortie 18 avec le conduit d'admission 5 et, au travers du calibreur 17, avec la canalisation amont 8a et le canister 1. La pression de commande Pc dans la chambre 14 est alors intermédiaire entre la pression du canister Pcan, en amont du calibreur 17, elle-même voisine de la pression atmosphérique Pa dans la chambre 13, et la pression dans le conduit d'admission 5, en aval du papillon 6. Pour un courant moyen de commande donné, et donc une position donnée de la membrane 12, du clapet 19 et du noyau 20, on comprend que si le papillon 6 est déplacé dans le sens de la fermeture, la dépression dans le conduit d'admission 5 augmente en aval du papillon 6. La pression de commande Pc tend à diminuer, et la pression différentielle s'exerçant sur la membrane 12 augmente, de sorte que le clapet 19 est rapproché de l'orifice de sortie 18. La section de passage diminuant, la pression de commande Pc en aval du calibreur 17 augmente, de sorte que la pression différentielle s'exerçant sur la membrane 12 tend à revenir à sa valeur initiale, et à rappeler la membrane 12, le clapet 19 et le noyau 20 dans leur position initiale donnée. Le fonctionnement est analogue lorsque le papillon 6 est manoeuvré dans le sens de l'ouverture. La vanne fonctionne ainsi comme un régulateur auto-correcteur.In operation, the
En fonctionnement, la membrane 12 est soumise à l'effort de rappel Fr du ressort 22, qui tend à fermer le clapet 19 sur la sortie 18, à un effort électromagnétique Fm s'exerçant sur le noyau 20 par le champ crée par la bobine 21, et à l'effort résultant de l'application, sur la surface efficace S de la membrane 12, de la pression différentielle entre la pression atmosphérique Pa dans la chambre 13 et la pression de commande Pc dans la chambre 14. En fonctionnement, la membrane 12 est en équilibre sous l'action de ces trois forces, selon la formule (1) suivante :
Simultanément, le débit de régénération Q passant par le calibreur 17 est donné par la formule connue (2) ci-dessous:
- Sc est la section de passage constante du calibreur 17,
- ρ la masse volumique du mélange air-combustible provenant du canister 1, et
- Pcan et Pc sont respectivement la pression dans le canister ou en amont du calibreur 17, et la pression de commande dans la chambre 14.
- Sc is the constant passage section of the
calibrator 17, - ρ 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 thechamber 14.
Comme Pa et Pcan sont voisines l'une de l'autre, on peut, dans la formule (2), remplacer Pcan - Pc par la valeur de Pa - Pc dans la formule (1), soit Fm - Fr .
On obtient que le débit Q est donné par la formule (3) :
We obtain that the flow rate Q is given by formula (3):
On constate que le débit Q de régénération est indépendant de Pcan, continu et modulé par la modulation de l'effort électromagnétique Fm, lui-même fonction du courant moyen de commande de la bobine 21. La vanne est ainsi à débit continu et proportionnel, asservi à une consigne de courant électrique. Pour que cette vanne soit relativement insensible aux vibrations du moteur, on choisit un ressort 22 à seuil d'effort faible mais suffisant à cet effet.It can be seen that 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
L'exemple de vanne de la figure 3 ne se distingue essentiellement de celui de la figure 2 que par les différences suivantes : le boîtier 11' présente un passage latéral 23, reliant l'une à l'autre les deux chambres 13 et 14, et dans lequel est monté le calibreur 17. La partie amont 8a de la canalisation de régénération n'est plus raccordée à la chambre 14 au travers du calibreur 17, mais à un orifice d'entrée 24 de la chambre 13, ayant un orifice de sortie 25 en communication avec l'orifice d'entrée 15 de la chambre 14 par l'intermédiaire du calibreur 17. Ainsi la chambre 13 n'est plus maintenue à la pression atmosphérique mais directement à la pression du canister Pcan. Pour le reste, on retrouve le solénoïde à bobine 21 et à plongeur 20 monobloc avec le clapet 19 et solidaire en mouvement de la membrane 12 sollicitée dans le sens de la fermeture du clapet 19 sur l'orifice de sortie 18 de la chambre 14 par le ressort de rappel 22.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
Dans cet exemple, la pression différentielle ou dépression Pcan - Pc qui agit sur le calibreur 17 s'applique directement sur la membrane 12, également soumise aux efforts Fr du ressort et Fm du solénoïde, comme définis ci-dessus. Les formules (1) à (3) données ci-dessus s'appliquent en remplaçant Pa par Pcan dans la formule (1). Cette vanne procure donc les mêmes avantages que celle de la figure 2 et permet de moduler le débit de régénération de façon continue, par l'intermédiaire d'une dépression variable, déterminée par la modulation d'un courant électrique moyen de commande.In this example, the differential pressure or vacuum Pcan - Pc which acts on the
Ce courant électrique est fourni par exemple par un calculateur de pilotage d'un carburateur ou un calculateur d'un système de contrôle moteur, et élaboré à partir d'informations provenant notamment d'une sonde de richesse, du type sonde λ, détectant la teneur en oxygène dans les gaz d'échappement du moteur.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 λ probe type, detecting the oxygen content in engine exhaust.
Claims (10)
- Electrically controlled valve for a canister (1) regenerating circuit (7), for an internal combustion engine supplied with air or carburetted air through at least one inlet pipe (5) in which the rate of flow is controlled by a stop valve (6), the canister (1) containing means (2) for absorbing the combustible vapours fed into the canister through a recovery pipe (3) and being provided with a vent (4) communicating with the atmosphere, and the canister regenerating circuit (7) comprising a pipeline system (8) linking the canister (1) to the inlet pipe (5), downstream of the stop valve (6), and the valve (9) mounted on the pipeline system (8), the said valve comprising a calibrator (17) of constant through-flow cross-section, a poppet valve (19) for controlling the rate of flow in the pipeline system (8), and which is connected in motion with a core (20) of a solenoid whose coil (21) is supplied through an electric current in order to control the force on the poppet valve, characterised in that the said poppet valve (19) is integral in motion with a flexible membrane (12) which defines in a casing (11,11') two chambers (13,14) of which a first chamber (13) is kept at a pressure near or equal to atmospheric pressure, and whose second chamber (14) is a chamber with modulated depression, enclosing the poppet valve (19) and set in communication through an inlet orifice (15) with the canister (1) by way of the said calibrator (17), and through an outlet orifice (18) with the inlet pipe (5), the membrane (12) thus subjected to a depression near or equal to that which acts on the calibrator (17) being equally subjected to the counter forces of elastic means (22) which try to close the poppet valve (19) onto the outlet orifice (18), and of the solenoid (20-21) whose coil (21) creates a force resulting in the poppet valve (19) leaving the outlet orifice (18) in order to open same when it is traversed by a variable mean current constituting an electrical order signal which fixes the force on the poppet valve (19).
- Valve according to claim 1 characterised in that the poppet valve (19) is linked in movement with the core (20) of the solenoid through means of reducing the amplitude of displacement of the poppet valve in relation to the amplitude of displacement of the said core.
- Valve according to claim 1 characterised in that the said poppet valve (19) is directly integral with the movement of the said core (20) of the solenoid, the poppet valve and core being set on both sides of the membrane (12).
- Valve according to claim 3 characterised in that the said poppet valve (19) is in a single piece with the said core (20), which extends at least in part into the said first chamber (13).
- Valve according to any of claims 1 to 4 characterised in that the said elastic means comprise at least one return spring (22) housed in the said first chamber (13).
- Valve according to claim 5 such as linked to claim 4, characterised in that the said return spring (22) is a helicoidal spring which surrounds in part and substantially coaxially the said core (20).
- Valve according to any of claims 1 to 6 characterised in that the said first chamber (13) is kept at atmospheric pressure.
- Valve according to any of claims 1 to 6 characterised in that the said first chamber (13) is kept at the pressure of the canister (1) with which it is linked through an inlet orifice (24) and has an outlet orifice (25) in communication with the inlet orifice (15) of the second chamber (14) by way of the said calibrator (17).
- Valve according to any of claims 1 to 8 characterised in that the said variable mean current is obtained by supplying the coil (20) of the solenoid through rectangular crenellations of electric current with variable cyclic ratio.
- Valve according to any of claims 1 to 9 characterised in that the said mean variable current is guided through a control member (10) which is susceptible to at least one signal coming from at least one sensor of a functioning parameter of the engine, such as the air/fuel ratio sensor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9215362 | 1992-12-21 | ||
FR9215362A FR2699603B1 (en) | 1992-12-21 | 1992-12-21 | Electrically operated canister regeneration circuit valve. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0604285A1 EP0604285A1 (en) | 1994-06-29 |
EP0604285B1 true EP0604285B1 (en) | 1997-01-22 |
Family
ID=9436827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19930403081 Expired - Lifetime EP0604285B1 (en) | 1992-12-21 | 1993-12-17 | Electrically actuated canister circuit regeneration valve |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0604285B1 (en) |
DE (1) | DE69307676T2 (en) |
ES (1) | ES2096254T3 (en) |
FR (1) | FR2699603B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6948481B2 (en) | 2003-03-07 | 2005-09-27 | Siemens Vdo Automotive Inc. | Electrical connections for an integrated pressure management apparatus |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5509395A (en) * | 1995-03-31 | 1996-04-23 | Siemens Electric Limited | Canister purge flow regulator |
FR2753747B1 (en) * | 1996-09-26 | 1998-11-27 | ELECTRICALLY CONTROLLED VALVE WITH CONTINUOUS OPENING IN OPERATION, FOR REGENERATION OF A FUEL VAPOR COLLECTOR | |
US6000677A (en) * | 1997-08-25 | 1999-12-14 | Siemens Canada Limited | Automotive emission control valve with a counter-force mechanism |
DE29717078U1 (en) * | 1997-09-24 | 1997-11-13 | Robert Bosch Gmbh, 70469 Stuttgart | Valve device |
US6470908B1 (en) * | 1999-11-19 | 2002-10-29 | Siemens Canada Limited | Pressure operable device for an integrated pressure management apparatus |
Family Cites Families (8)
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 |
JPS5382915A (en) * | 1976-12-28 | 1978-07-21 | Toyota Motor Corp | Controlle for supply of fuel evaporated gas for internal combustion engine |
US4577607A (en) * | 1983-05-20 | 1986-03-25 | Aisin Seiki Kabushiki Kaisha | Control valve device |
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 |
US4886026A (en) * | 1988-09-01 | 1989-12-12 | Ford Motor Company | Fuel injection control system |
FR2671597B1 (en) * | 1991-01-16 | 1993-07-09 | Eaton Sa Monaco | SOLENOID VALVE WITH VARIABLE PASSAGE SECTION. |
-
1992
- 1992-12-21 FR FR9215362A patent/FR2699603B1/en not_active Expired - Lifetime
-
1993
- 1993-12-17 ES ES93403081T patent/ES2096254T3/en not_active Expired - Lifetime
- 1993-12-17 EP EP19930403081 patent/EP0604285B1/en not_active Expired - Lifetime
- 1993-12-17 DE DE1993607676 patent/DE69307676T2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6948481B2 (en) | 2003-03-07 | 2005-09-27 | Siemens Vdo Automotive Inc. | Electrical connections for an integrated pressure management apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE69307676D1 (en) | 1997-03-06 |
EP0604285A1 (en) | 1994-06-29 |
DE69307676T2 (en) | 1997-09-04 |
FR2699603A1 (en) | 1994-06-24 |
ES2096254T3 (en) | 1997-03-01 |
FR2699603B1 (en) | 1995-03-10 |
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