FR2653493A1 - Improvement in the efficiency of a catalytic converter for a supercharged diesel engine - Google Patents

Improvement in the efficiency of a catalytic converter for a supercharged diesel engine Download PDF

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Publication number
FR2653493A1
FR2653493A1 FR8913965A FR8913965A FR2653493A1 FR 2653493 A1 FR2653493 A1 FR 2653493A1 FR 8913965 A FR8913965 A FR 8913965A FR 8913965 A FR8913965 A FR 8913965A FR 2653493 A1 FR2653493 A1 FR 2653493A1
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Prior art keywords
flap
compressor
engine
discharge valve
pressure
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FR8913965A
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French (fr)
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FR2653493B1 (en
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Priority to FR8913965A priority Critical patent/FR2653493B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • F02D23/02—Controlling engines characterised by their being supercharged the engines being of fuel-injection type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
    • F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/64—Systems for actuating EGR valves the EGR valve being operated together with an intake air throttle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

Device making it possible to improve efficiency at light load, of a catalytic converter 12 mounted in the exhaust pipe 11 of a diesel engine which is supercharged by a turbocompressor 4. It includes a valve 14 mounted in a bypass pipe 13 allowing the exhaust gases to be recycled (regenerated) and a flap 15 placed in the inlet port 9. The valve 14 and the flap 15 are associated with a control means including a sensor 17 sensing the pressure at the outlet of the compressor 6 and a device 19 for measuring the speed of the engine, capable at the same time of causing the discharge valve to open and the flap 15 to close when the pressure at the outlet of the compressor is below a predetermined value and the speed of the engine is above a value which is also predetermined.

Description

Linvention concerne un dispositif permettant d'améliorer l'éfficacité dn catalyseur sur un moteur Diesel suralimenté par un turbocompresseur, notamment aux faibles charges. The invention relates to a device for improving the efficiency of a catalyst on a diesel engine supercharged by a turbocharger, especially at low loads.

Le turbocompresseur de suralimentation d'un moteur à combustion interne est constitué dune turbine disposée sur le trajet des gaz a la sortie du moteur et qui est entraînée par cew-ci, cette turbine est elle-même accouplée en rotation a un compresseur interposé sur le trajet des gaz entrant dans le collecteur d'admission du moteur de fanon a augmenter la pression de ces gaz. The turbocharger of an internal combustion engine is constituted by a turbine disposed on the path of the gas at the output of the engine and which is driven thereby, this turbine is itself coupled in rotation to a compressor interposed on the gas path entering the intake manifold of the dewax motor has to increase the pressure of these gases.

Lorsqu'un tel moteur est, en outre, équipé d'un système de dépollution comportant un catalyseur disposé dans le circuit d'échappement, en aval de la turbine, la détente thermodynamique des gaz dans ladite turbine entraine leur refroidissement et augmente donc l'inertie thermique de l6chappement. I1 en résulte que l'échauffement des gaz d > chappement ne s'effectue que très lentement et demeure faible lorsque le moteur est peu chargé (en ville, a faible allure, par exemple). Or on sait qu'un catalyseur d'oxydation nest efficace que lorsqu'il est porté a une température relativement élevée, de sorte que dans les cas de fonctionnement évoqués plus haut cette efficacitX sera fortement réduite. When such an engine is, in addition, equipped with a pollution control system comprising a catalyst disposed in the exhaust circuit, downstream of the turbine, the thermodynamic expansion of the gases in said turbine causes them to cool and therefore increases the thermal inertia of the exhaust. As a result, the heating of the exhaust gases takes place only very slowly and remains low when the engine is lightly loaded (in the city, at low speed, for example). However, it is known that an oxidation catalyst is effective only when it is heated to a relatively high temperature, so that in the cases of operation mentioned above this efficiency will be greatly reduced.

Un moyen pour réduire cet inconvénient consiste à injecter dans le conduit d'admission une partie des gaz d6chap- pement afin d'augmenter, par ce recyclage, leur température. One way to reduce this disadvantage is to inject into the intake duct a portion of the exhaust gas in order to increase, by this recycling, their temperature.

En outre, on peut intercaler un volet dans le circuit d'admis- sion entre la sortie du compresseur et arrivée des gaz d > 6chappement. Ce volet présente le double avantage dPaugmen- ter la pression dans le conduit d'admission en diminuant le volume des gaz d'échappement dès que la charge du moteur s'accrolt, afin de ne pas provoquer un échauffement inconsidé- ré de celui-ci. De meme il n'est pas souhaitable que cette recirculation ait lieu durant la phase de démarrage car la présence de gaz brLés peut y engendrer des perturbations.In addition, it is possible to insert a flap in the intake circuit between the compressor outlet and the exhaust gas inlet. This flap has the dual advantage of increasing the pressure in the intake duct by reducing the volume of the exhaust gases as soon as the engine load increases, so as not to cause an uncontrolled heating of the latter. . Similarly it is not desirable that this recirculation takes place during the start-up phase because the presence of broken gas can cause disturbances therein.

Un but de la présente invention est donc de proposer un dispositif permettant d'améliorer lPefficacit aw faibles charges d'un catalyseur monté dans le conduit d'échappement dun moteur Diesel suralimenté par une turbocompresseur comprenant une turbine disposée dans la tubulure d'échappement et entraînant en rotation un compresseur placé dans la tubu lure d'admission, ledit moteur comportant, en outre, une vanne de décharge, branchée dans un conduit de dérivation, dont l > ouverture permet le passage des gaz circulant dans la tubulure d'échappement, en amont de la turbine, vers la tubulure d'admission, en aval du compresseur, ainsi qu'un volet commandé par un actionneur et placé dans la tubulure d'admission.Ce dispositif se caractérise en ce que la vanne de décharge et l'actionneur du volet sont associés à un moyen de commande comportant un capteur de la pression à la sortie du compresseur et un dispositif de mesure de la vitesse du moteur, capable de commander, en meme temps, l'ouverture de la vanne de décharge et la fermeture du volet lorsque la pression a la sortie du compresseur mesurée par le capteur est inférieure a une valeur prédéterminée représentative de la charge du moteur et la vitesse dudit moteur supérieure å une valeur également prédéterminée. An object of the present invention is therefore to provide a device for improving the efficiency with low loads of a catalyst mounted in the exhaust duct of a supercharged diesel engine by a turbocharger comprising a turbine disposed in the exhaust manifold and driving. in rotation a compressor placed in the intake manifold, said engine further comprising a discharge valve, connected in a bypass duct, the opening of which allows the passage of gases flowing in the exhaust manifold, in upstream of the turbine, to the intake manifold, downstream of the compressor, and a shutter controlled by an actuator and placed in the intake manifold.This device is characterized in that the discharge valve and the actuator of the flap are associated with a control means comprising a pressure sensor at the outlet of the compressor and a device for measuring the speed of the motor, capable of controlling, in m time, opening the discharge valve and closing the flap when the pressure at the compressor outlet measured by the sensor is less than a predetermined value representative of the engine load and the speed of said engine higher than a value also predetermined.

L'invention sera mieux comprise à la lecture de la description qui va suivre d'une réalisation d'un dispositif selon l'invention donnée à titre d"emple non limitatif, et en se référant aux figures jointes en annexe dans lesquelles : - La figure i est un schéma d'un moteur selon l'invention, - La figure 2 est un diagramme montrant. pour des valeurs
diérentes de la pression de suralimentation, les courbes du
couple délivré par le moteur en fonction de son régime. The invention will be better understood on reading the following description of an embodiment of a device according to the invention given by way of non-limiting example, and with reference to the appended figures in which: Fig. 1 is a diagram of an engine according to the invention, Fig. 2 is a diagram showing for values
different from the boost pressure, the curves of the
torque delivered by the engine according to its regime.

Sur la figure 1, est représentée schématiquement un moteur 1 auquel sont reliés, dn coté le collecteur d'admis- sion 2 et de l'autre côté le collecteur d'échappement 3. La suralimentation de ce moteur est assurée par un turbocompresseur 4 constitué d'une turbine 5 accouplée en rotation, par l'intermédiaire d'un arbre 7, a un compresseur 6. L'entrée du compresseur 6 est branchée sur un conduit 8 d'arrivée des gaz tandis que sa sortie communique avec une tubulure 9 banchée à son autre extrémité sur le conduit d'admission 2.De la m?me fagon, ventrée de la turbine 5 est branchée, par l'inter- médiaire de la tubulure 10 sur le collecteur d'échappement et sa sortie débouche sur un conduit 11, permettant l'échap- pement des gaz brûlés dans l'atmosphère, qui comporte un catalyseur 12. Une conduite de dérivation 13 est placée entre les tubulures d'échappement 10 et d'admission 9, elle comporte une vanne de décharge fonctionnant, dans le sens passant, de la tubulure d'échappement 10 a la tubulure d'admission 9. Un volet mobile 15, commandé par une actionneur 16 est disposé dans la tubulure d'admission 9, entre la sortie du compresseur 6 et la sortie de la conduite 13. FIG. 1 diagrammatically shows a motor 1 to which the intake manifold 2 is connected on the side and the exhaust manifold 3 on the other side. The supercharging of this engine is ensured by a turbocharger 4 consisting of of a turbine 5 coupled in rotation, via a shaft 7, to a compressor 6. The inlet of the compressor 6 is connected to a conduit 8 for the arrival of the gases while its outlet communicates with a pipe 9 at the other end on the inlet duct 2. In the same way, the inlet of the turbine 5 is connected via the pipe 10 to the exhaust manifold and its outlet opens onto a duct. conduit 11, permitting the escape of the flue gases into the atmosphere, which comprises a catalyst 12. A bypass line 13 is placed between the exhaust pipes 10 and inlet 9, it comprises a working discharge valve , in the running direction, of the tub exhaust flue 10 to the intake manifold 9. A movable flap 15, controlled by an actuator 16 is disposed in the intake manifold 9, between the outlet of the compressor 6 and the outlet of the duct 13.

En outre, un capteur de pression 17 est placé dans la tubulure d'admission 9, a la sortie du compresseur, sa sortie est reliée a l'entrée d'un circuit électronique de commande 18 qui repoit également des informations sur le régime du moteur, par l'intermédiaire d'un capteur de vitesse 19. La sortie du circuit de commande 18 est connectée a une électovanne 20 qui relie une source de vide 21 à la vanne 14, interposée dans la conduit de dérivation 13 et à l'actionneur 16 du volet 15. La source de vide 21 est, par exemple, la pompe utilisée dans le circuit de freinage. In addition, a pressure sensor 17 is placed in the intake manifold 9, at the outlet of the compressor, its output is connected to the input of an electronic control circuit 18 which also receives information on the speed of the engine. by means of a speed sensor 19. The output of the control circuit 18 is connected to an electrovalve 20 which connects a vacuum source 21 to the valve 14, interposed in the bypass duct 13 and to the actuator 16 of the flap 15. The vacuum source 21 is, for example, the pump used in the braking circuit.

La figure 2 représente la courbe du couple développé par le moteur, en fonction de son régime, pour di++érentes pres suions de suralimentation " P1, P2, P3, P4, mesurées à la sortie du compresseur 6. Lorsque cette pression de suralimentation est inférieure a la valeur P1 prédéterminée, le moteur est-peu chargé et, par conséquent, la température des gaz d'échappement faible.Si en mSme temps, la vitesse du moteur est supérieure å la valeur N choisie légèrement inférieure à celle du
o ralenti pour éviter de faire fonctionner le système durant la période de démarrage, le circuit de commande 18 délivre un signal a l'électrovanne 2, laquelle s'ouvre pour mettre en communication la pompe à vide 21, d'une part, et la vanne 14 ainsi que l'actionneur 16, d'autre part. La vanne 14 s'ouvre laissant circuler les gaz d'échappement dans la tubulure 9, vers l'admission 2, tandis que l'actionneur 16 place le volet 15 en position fermée, augmentant ainsi la pression dans la tubulure 9.FIG. 2 shows the curve of the torque developed by the engine, as a function of its speed, for di ++ erent supercharging pressures "P1, P2, P3, P4, measured at the outlet of the compressor 6. When this supercharging pressure is less than the predetermined value P1, the engine is lightly loaded and therefore the temperature of the exhaust gas is low. If at the same time, the engine speed is greater than the chosen value N slightly less than that of the engine.
idle to avoid operating the system during the start-up period, the control circuit 18 delivers a signal to the solenoid valve 2, which opens to connect the vacuum pump 21, on the one hand, and the valve 14 and the actuator 16, on the other hand. The valve 14 opens allowing the exhaust gases to circulate in the pipe 9, towards the inlet 2, while the actuator 16 places the shutter 15 in the closed position, thus increasing the pressure in the pipe 9.

Inversement, lorsque la pression à la sortie du compresseur atteint une valeur supérieure a P1 indiquant que la charge du moteur est suffisante, le circuit 18 commande la fermeture de l'électrovanne de sorte que la vanne 14 ferme la conduite 1.3 et que l'actionneur 16 place le volet 15 en position ouverte, le dispositif de recyclage est désormais inactif.Conversely, when the pressure at the outlet of the compressor reaches a value greater than P1 indicating that the engine load is sufficient, the circuit 18 controls the closure of the solenoid valve so that the valve 14 closes the pipe 1.3 and the actuator 16 places the flap 15 in the open position, the recycling device is now inactive.

On obtient ainsi un recyclage des gaz d'échappement capable d'augmenter leur température, en fonction d'un domaine de charge très précis du moteur, ce qui évite les inconvénients liés à ce procédé de recyclage en phase d'accélération et a démarrage. This results in an exhaust gas recirculation capable of increasing their temperature, depending on a very precise load range of the engine, which avoids the disadvantages associated with this recycling process in the acceleration and starting phase.

Le dispositif est en outre simple, le capteur de pression peut-etre, par exemple un manocontact qui change d'état lorsque la pression P1 prédéterminé est atteinte. Si l'on désire obtenir une mise en route du système plus progressive et donc plus efficace, il suffira d'utiliser un capteur analogique, par exemple potentiométrique qui permettra, en fonction des informations transmises de régler l'angle de fermeture du volet et le niveau d'ouverture de la vanne.  The device is also simple, the pressure sensor may be, for example a pressure switch that changes state when the predetermined pressure P1 is reached. If it is desired to obtain a more gradual and therefore more efficient start-up of the system, it will suffice to use an analog sensor, for example a potentiometric sensor which will make it possible, according to the transmitted information, to adjust the closure angle of the shutter and the opening level of the valve.

Claims (3)

REVEND I CAT IONSCLASS I CAT IONS 1- Dispositif permettant d'améliorer l'efficacité aux faibles charges, d'un catalyseur (12) monté dans le conduit d'échappement (11) d'un moteur Diesel suralimenté par un turbocompresseur (4) comprenant une turbine (5) disposée dans la tubulure d'échappement (lui) et entravant en rotation un compresseur (6) placé dans la tubulure d'admission (9), ledit moteur comportant, en outre, une vanne de décharge (14) branchée dans une conduite de dérivation (13) dont couverture permet le passage des gaz circulant dans la tubulure d"échap- pement (10) en amont de la turbine (5) vers la tubulure d'admission (9) en aval du compresseur 6, ainsi qu'un volet (15) commandé par un actionneur (t6) et placé dans la tubulure d'admission (9), caractérisé en ce que la vanne de décharge (14) et l3action- neur (16) du volet (15) sont associée a un moyen de commande comportant un capteur (17) de la pression a la sortie du compresseur et un dispositif de mesure (19) de la vitesse du moteur, capable de commander en même temps, l'ouverture de la vanne de décharge et la fermeture du volet (15) lorsque la pession, a la sortie du compresseur mesurée par le capteur (17) est inférieure à une valeur (P1) prédéterminée, représentative de la charge du moteur et la vitesse dudit moteur supérieure à une valeur (N ) également prédéterminée. 1-device for improving the efficiency at low loads, a catalyst (12) mounted in the exhaust duct (11) of a supercharged diesel engine with a turbocharger (4) comprising a turbine (5) arranged in the exhaust pipe (11) and rotating a compressor (6) in the intake pipe (9), said engine further comprising a discharge valve (14) connected to a bypass pipe ( 13) whose cover allows the passage of gases flowing in the exhaust pipe (10) upstream of the turbine (5) to the inlet pipe (9) downstream of the compressor 6, and a flap ( 15) controlled by an actuator (t6) and placed in the intake manifold (9), characterized in that the discharge valve (14) and the actuator (16) of the flap (15) are associated with a means of control comprising a pressure sensor (17) at the outlet of the compressor and a device (19) for measuring the speed of the motor, at the same time, to open the discharge valve and to close the flap (15) when the pressure at the compressor outlet measured by the sensor (17) is less than a predetermined value (P1), representative the motor load and the speed of said motor greater than a value (N) also predetermined. o o 2- Dispositif selon la revendication 1, caractérisé en ce que le moyen de commande comporte un circuit électronique (18) qui reçoit les informations du capteur de pression (17) et du compteur de vitesse (19) pour commander, en conséquence, une électro-vanne (20) dont l'ouverture déclenche celle de la vanne de décharge (14) et la fermeture du volet (15) par l'intermédiaire de l'actionneur (  2- Device according to claim 1, characterized in that the control means comprises an electronic circuit (18) which receives the information of the pressure sensor (17) and the speedometer (19) to control, accordingly, an electro -vanne (20) whose opening triggers that of the discharge valve (14) and the closure of the flap (15) via the actuator ( - Dispositif selon la revendication 2, caractérisé en ce que le capteur de pression (17) est un manocontact. - Device according to claim 2, characterized in that the pressure sensor (17) is a pressure switch. 4- Dispositif selon la revendication 2, caractérisé en ce que le capteur de pression (17) est un capteur analogique.  4- Device according to claim 2, characterized in that the pressure sensor (17) is an analog sensor.
FR8913965A 1989-10-25 1989-10-25 IMPROVEMENT OF THE EFFICIENCY OF A CATALYST FOR A SUPER-FUEL DIESEL ENGINE. Expired - Fee Related FR2653493B1 (en)

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FR8913965A FR2653493B1 (en) 1989-10-25 1989-10-25 IMPROVEMENT OF THE EFFICIENCY OF A CATALYST FOR A SUPER-FUEL DIESEL ENGINE.

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Application Number Priority Date Filing Date Title
FR8913965A FR2653493B1 (en) 1989-10-25 1989-10-25 IMPROVEMENT OF THE EFFICIENCY OF A CATALYST FOR A SUPER-FUEL DIESEL ENGINE.

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FR2653493B1 FR2653493B1 (en) 1991-12-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548915A1 (en) * 1991-12-23 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Control circuit for predominantly inductive loads, in particular, electroinjectors
WO2003046354A1 (en) * 2001-11-30 2003-06-05 Scania Cv Ab (Publ) Method and apparatus for a combustion engine having a catalyzer and diesel engine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2118786A5 (en) * 1970-12-17 1972-07-28 Bosch
FR2133166A5 (en) * 1971-04-09 1972-11-24 Oxy France
DE2328459A1 (en) * 1973-01-31 1975-01-02 Bosch Gmbh Robert System for checking activity of catalytic reactors - signals bad functioning of such reactors and causes engine to run unstable
JPS54120310A (en) * 1978-03-10 1979-09-18 Toyota Motor Corp Exhaust-gas reforming apparatus
JPS57126516A (en) * 1981-01-30 1982-08-06 Fuji Heavy Ind Ltd Internal combustion engine with supercharger
DE3306484A1 (en) * 1982-04-27 1983-11-03 Nissan Motor Co., Ltd., Yokohama, Kanagawa Exhaust-gas control system for internal combustion engines with a turbocharger and a catalytic converter for exhaust-gas detoxification

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2118786A5 (en) * 1970-12-17 1972-07-28 Bosch
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EP0548915A1 (en) * 1991-12-23 1993-06-30 ELASIS SISTEMA RICERCA FIAT NEL MEZZOGIORNO Società Consortile per Azioni Control circuit for predominantly inductive loads, in particular, electroinjectors
US5532526A (en) * 1991-12-23 1996-07-02 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile Per Azioni Control circuit for predominantly inductive loads in particular electroinjectors
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