EP0681646A1 - Method and device for reducing harmful gas emissions from a motor vehicle internal combustion engine. - Google Patents

Method and device for reducing harmful gas emissions from a motor vehicle internal combustion engine.

Info

Publication number
EP0681646A1
EP0681646A1 EP94905069A EP94905069A EP0681646A1 EP 0681646 A1 EP0681646 A1 EP 0681646A1 EP 94905069 A EP94905069 A EP 94905069A EP 94905069 A EP94905069 A EP 94905069A EP 0681646 A1 EP0681646 A1 EP 0681646A1
Authority
EP
European Patent Office
Prior art keywords
engine
mechanical power
auxiliary device
alternator
motor vehicle
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
EP94905069A
Other languages
German (de)
French (fr)
Other versions
EP0681646B1 (en
Inventor
Alain Antranik Atanasyan
Alain Michel Residence Aubourg
Alain Joseph Perez
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.)
Continental Automotive France SAS
Original Assignee
Siemens Automotive SA
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 Siemens Automotive SA filed Critical Siemens Automotive SA
Publication of EP0681646A1 publication Critical patent/EP0681646A1/en
Application granted granted Critical
Publication of EP0681646B1 publication Critical patent/EP0681646B1/en
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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • 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
    • F02B75/00—Other engines
    • F02B75/10—Engines with means for rendering exhaust gases innocuous

Definitions

  • the present invention relates to a method and a device for reducing harmful gas emissions produced by an internal combustion engine and, more particularly, to such a method and such a device designed for an engine propelling a motor vehicle and providing energy to various auxiliary devices such as an alternator, an air conditioning compressor, a pump forming part of a hydraulic suspension or power steering device, etc ...
  • auxiliary devices are increasing in current vehicles, that either to improve the comfort of the vehicle or to meet increasingly stringent emission standards. These devices are driven by the motor, by means of belts or chains and thus increase the load on this motor.
  • the present invention therefore aims to provide a method and a device for effectively reducing the production of harmful gases by an internal combustion engine propelling a motor vehicle.
  • the present invention also aims to provide such a method and such a device making it possible to reduce this production in particular during a cold start phase of the engine, so as to ensure compliance with the most stringent anti-pollution standards.
  • the device is decoupled from the engine during said start-up phase.
  • the mechanical power supplied to the auxiliary apparatus is no longer reduced when the temperature of a catalytic converter for treating the engine exhaust gases and / or that of the engine itself, reaches a predetermined value.
  • These temperature conditions determine the moment when the engine and / or the catalytic converter have reached an operating regime close to normal, such that the supply of auxiliary devices with mechanical energy becomes possible without exceeding emission standards.
  • the invention provides a device which comprises means for reducing, during a cold start phase of the vehicle, the mechanical power supplied by the engine to at least one auxiliary device, by compared to that absorbed by the device in normal operation.
  • said means consist of a) clutch means interposed between the engine and the apparatus and b) means of disengaging these clutch means to interrupt any transmission of mechanical power from the engine to the auxiliary device.
  • said means for reducing the mechanical power absorbed by the alternator comprise means for reducing The intensity of the latter's excitation current.
  • FIG. 1 is a diagram of a first embodiment of a device for implementing the method according to the invention
  • FIG. 2 is a diagram of a second embodiment of this device, applied by way of example to a vehicle equipped with a pump for pressurizing a fluid used in a power steering mechanism
  • Figure 3 is a diagram of another embodiment of the device according to the invention, associated with an alternator for recharging the battery of a motor vehicle
  • - FIG. 4 is a flow diagram of a method of implementing the Figure 3 device.
  • FIG. 1 shows schematically an internal combustion engine 1 propelling a motor vehicle, this engine being supplied with air via an intake manifold 2, the combustion gases being discharged into an exhaust manifold 3, the outlet of which can be fitted with a catalytic converter 4 for redoxing certain chemical species contained in these gases, into less harmful chemical species.
  • the output shaft 5 of the engine conventionally connected to the gearbox of the motor vehicle via a clutch (not shown), is also conventionally connected by a belt or chain 6 to an auxiliary device 7 which receives thus the mechanical energy of the motor 1, via its input shaft 8.
  • auxiliary device 7 For clarity of the drawing, a single auxiliary device 7 has been shown, but it should be understood that the engine normally drives several such auxiliary devices, vehicle battery charging alternator (not shown), fan and, optionally, refrigerant gas compressor forming part of a vehicle air conditioning system, pump for pressurizing a fluid used in a suspension or power steering of this vehicle, etc ..., as we saw above.
  • the input shaft 8 of the auxiliary device 7 is fitted with a clutch member 9, the disengagement of which eliminates any transmission of mechanical energy. between the engine and the auxiliary device 7.
  • this clutch member could be provided at 10, on the engine output shaft.
  • An electronic computer 11 with microprocessor 12 conventionally equips the vehicle, for controlling for example the ignition and / or the injection of fuel into the engine 1.
  • This computer receives from various sensors signals S representative of the cooling water temperature of the engine, of the temperature of the exhaust gases, of the speed and of the intake pressure of the engine, etc. in order to deduce therefrom appropriate commands from the ignition and injection members.
  • signals S representative of the cooling water temperature of the engine, of the temperature of the exhaust gases, of the speed and of the intake pressure of the engine, etc. in order to deduce therefrom appropriate commands from the ignition and injection members.
  • these means could be arranged outside this computer, but the presence of the latter in the vehicle makes this particularly convenient and economical solution.
  • the microprocessor 12 controls, via a power stage 13, the disengagement of the member 9, to then relieve the engine from the additional load the auxiliary device would otherwise impose on it 7.
  • the computer determines the moment when, the engine and / or the catalytic converter 4 having reached a sufficient temperature close to their operating temperature, the exhaust gases are sufficiently free of harmful species so that the activation of the auxiliary devices can be authorized in order to improve the comfort of the vehicle (air conditioning, power steering) or ensure battery recharging (alternator).
  • Various conventional, electromagnetic, electromechanical or electro-hydraulic clutch members can be used to implement the invention inexpensively.
  • FIG. 2 shows another embodiment of the device according to the invention, designed more particularly to reduce or cancel the load imposed on the output shaft of the motor 1 by a pump P driven by this motor to supply fluid under pressure a jack V forming part of a power steering device D.
  • the pump is supplied by a reservoir 14.
  • a return duct 15 is conventionally placed between the pump and the reservoir, while the pump delivers in a line 16 cylinder power supply.
  • the computer can thus actuate the solenoid valve 18 to open the duct 17.
  • the pump outlet then discharges into the tank, preventing the rise in pressure of the fluid supplying the jack V.
  • the load of the pump on the engine is then greatly reduced, with a corresponding decrease in the production of exhaust gases.
  • a variable pressure drop solenoid valve can be used which modulates the reduction in the load applied to the motor by the pump, following a command programmed in the computer.
  • Various pump control strategies are applicable, at the discretion of the designer. As an example of such a strategy, mention may be made of ensuring that the cylinder is supplied with high pressure fluid only if the engine temperature, read by a coolant temperature sensor 19, is greater than a threshold value (60 ° C for example) and if the temperature of the exhaust gases read by a temperature sensor 20 placed at the outlet of the catalytic converter 4 is higher than another threshold value (350 ° C for example) , or if the vehicle is moving, as is detectable using a speed sensor 21 sensitive to the rotation of a wheel 22 of the vehicle.
  • a threshold value 60 ° C for example
  • another threshold value 350 ° C for example
  • FIG 3 there is shown schematically a device according to the invention, designed to relieve the engine of the load normally imposed on it by the drive of an alternator 23 conventionally ensuring the charge of the battery 24 of the vehicle by means of a circuit 25, the alternator further comprising one or more excitation windings 26 supplied by an excitation current i, as is well known.
  • the intensity i of this excitation current can be adjusted by the computer il, whose microprocessor 12 is duly programmed to control this current, by means of a power transistor 13 placed in series with the excitation winding 26, between the terminal positive battery and ground.
  • the output voltage of the battery 24, known by one of the inputs 27 of the computer 11, is compared with a threshold voltage, of 10 volts for example, if the nominal voltage of the battery is 12 volts . If the voltage supplied by the battery is below the threshold, the excitation current of the alternator is adjusted to its maximum value to accelerate the charging of the battery and the return of its output voltage to its nominal value. , necessary for the proper functioning of the vehicle.
  • the strategy consists in reducing the intensity of the excitation current of the alternator as long as the engine 1 and the catalytic converter 4 have not reached temperatures sufficiently close to their operating temperatures so that the quantity of harmful species contained in the gases treated by the catalyst is then kept within the limits set by the standards to be observed.
  • the excitation current will be reduced as long as the temperature of the coolant, representative of that of the engine, is lower than 60 ° C and that the temperature of the exhaust gases, representative of that of the catalytic converter, will be less than 350 C C.
  • the excitation current i can then be fixed, so as to limit the power absorbed by the alternator while ensuring a minimum charge of the battery, for example at a value given by the formula: i ⁇ k / N, where k is a constant and N the engine speed in rpm, measured by a sensor 28, with variable reluctance for example.
  • the current i is set to its maximum value to ensure a suitable charge of the battery.
  • the invention is not limited to the embodiments described and shown which have been given only by way of example.
  • the invention is not limited to a device for controlling only one of the above-mentioned auxiliary devices.
  • a device according to the invention could simultaneously control the total or partial decoupling of the alternator, a pump, a compressor, etc.
  • the device according to the invention could disengage this clutch during the cold start phase, so as to relieve the engine of the load imposed on it by the gearbox, even if the latter is then in neutral.
  • the present invention provides many advantages. In the vehicle start-up phase, it minimizes pollution despite the presence of numerous auxiliary devices installed to improve vehicle comfort.
  • the invention can bring a reduction of approximately 10 to 20% in the emissions of unburnt hydrocarbons and of oxide of carbon during a standardized start-up cycle. It also makes it possible to model the strategy for controlling the supply of mechanical energy to the auxiliary devices, so as to obtain such or such an optimal compromise between controlling the emission of polluting gases, the comfort of the vehicle and recharging the battery.
  • the control of the alternator by the computer also makes it possible, incidentally, to install diagnostic functions for the operation of the charging means of this battery, the dimensions of which can be optimized by means of the controlled recharging established by the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The mechanical power supplied by an engine (1) to an auxiliary apparatus (23) is reduced during a cold starting phase of the engine with respect to the power normally absorbed by the normally operating apparatus. When the apparatus is an alternator, a reduction in the power supplied by the engine, and a resulting drop in pollution, may be achieved by reducing the alternator exciting current (I) under the control of a computational unit (11).

Description

Procédé et dispositif de réduction des émissions de gaz nocifs produites par un moteur à combustion in¬ terne propulsant un véhicule automobile Method and device for reducing harmful gas emissions produced by an internal combustion engine propelling a motor vehicle
La présente invention est relative à un procédé et à un dispositif de réduction des émissions de gaz nocifs produites par un moteur à combustion interne et, plus particulièrement, à un tel procédé et un tel dispositif conçus pour un moteur propulsant un véhicule automobile et fournissant de l'énergie à divers appareils auxiliaires tels qu'un alternateur, un compresseur de climatisation, une pompe formant partie d'un dispositif de suspension hydraulique ou de direction assistée, etc... De tels appareils auxiliaires se multiplient dans les véhicules actuels, que ce soit pour améliorer le confort du véhicule ou pour satisfaire à des normes antipollution de plus en plus sévères. Ces appareils sont entraînés par le moteur, par 1'intermédiaire de courroies ou de chaînes et accroissent ainsi la charge de ce moteur. Cet accroissement est particulièrement dommageable pendant une phase de démarrage à froid de ce dernier, à un moment où 1'enrichissement nécessaire du mélange air/carburant conduit à une pollution accrue par des gaz d'échappement chargés notamment d'hydrocarbures imbrûlés, alors même que les moyens utilisés pour réduire cette pollution, tels que les pots catalytiques, ne sont pas efficaces faute d'avoir atteint une température suffisante.The present invention relates to a method and a device for reducing harmful gas emissions produced by an internal combustion engine and, more particularly, to such a method and such a device designed for an engine propelling a motor vehicle and providing energy to various auxiliary devices such as an alternator, an air conditioning compressor, a pump forming part of a hydraulic suspension or power steering device, etc ... Such auxiliary devices are increasing in current vehicles, that either to improve the comfort of the vehicle or to meet increasingly stringent emission standards. These devices are driven by the motor, by means of belts or chains and thus increase the load on this motor. This increase is particularly damaging during a cold start phase of the latter, at a time when the necessary enrichment of the air / fuel mixture leads to increased pollution by exhaust gases loaded in particular with unburnt hydrocarbons, even though the means used to reduce this pollution, such as catalytic converters, are not effective because they have not reached a sufficient temperature.
Pour réduire cette pollution, on a proposé de réchauffer le pot catalytique par chauffage électrique tiré de la batterie du véhicule et/ou d'injecter de l'air à l'échappement du moteur. Mais ces mesures impliquent des consommations d'énergie électrique supplémentaires qui conduisent à dimensionner plus largement la batterie et l'alternateur qui la charge, ce dernier consommant alors une énergie mécanique accrue que doit fournir le moteur au prix d'une production de gaz d'échappement également accrue qui réduit beaucoup 1'intérêt de ces mesures.To reduce this pollution, it has been proposed to heat the catalytic converter by electric heating drawn from the vehicle battery and / or to inject air into the engine exhaust. But these measures imply additional electrical energy consumption which leads to a larger dimensioning of the battery and the alternator which charges it, the latter then consuming increased mechanical energy which the engine must supply at the cost of producing gas. also increased exhaust which greatly reduces the value of these measures.
La présente invention a donc pour but de, fournir un procédé et un dispositif permettant de réduire efficacement la production de gaz nocifs par un moteur à combustion interne propulsant un véhicule automobile. La présente invention a aussi pour but de fournir un tel procédé et un tel dispositif permettant de réduire cette production en particulier pendant une phase de démarrage à froid du moteur, de manière à assurer le respect des normes antipollution les plus sévères.The present invention therefore aims to provide a method and a device for effectively reducing the production of harmful gases by an internal combustion engine propelling a motor vehicle. The present invention also aims to provide such a method and such a device making it possible to reduce this production in particular during a cold start phase of the engine, so as to ensure compliance with the most stringent anti-pollution standards.
On atteint ces buts de l'invention, ainsi que d'autres qui apparaîtront à la lecture de la description qui va suivre, avec un procédé suivant lequel, pendant une phase de démarrage à froid du véhicule, on réduit la puissance mécanique fournie par le moteur à au moins un appareil auxiliaire, par rapport à celle absorbée par l'appareil en fonctionnement normal.These objects of the invention are achieved, as well as others which will appear on reading the description which follows, with a method according to which, during a cold start phase of the vehicle, the mechanical power supplied by the motor with at least one auxiliary device, compared to that absorbed by the device in normal operation.
Suivant un mode de mise en oeuvre de la présente invention, on découple l'appareil du moteur pendant ladite phase de démarrage.According to an embodiment of the present invention, the device is decoupled from the engine during said start-up phase.
En découplant ainsi tous les appareils auxiliaires chargeant normalement le moteur, tel qu'un alternateur, un compresseur d'air, une pompe etc..., et non absolument nécessaires à son démarrage, on allège sensiblement la charge du moteur ce qui, par contrecoup, réduit sensiblement la production de gaz d'échappement de ce moteur et, finalement, la pollution de l'environnement par ces gaz.By thus decoupling all the auxiliary devices normally charging the engine, such as an alternator, an air compressor, a pump, etc., and not absolutely necessary for starting it, the load on the engine is considerably reduced, which, by backlash, significantly reduces the production of exhaust gases from this engine and, ultimately, the pollution of the environment by these gases.
Suivant une stratégie de mise en oeuvre du procédé selon l'invention, on cesse de réduire la puissance mécanique fournie à l'appareil auxiliaire quand la température d'un pot catalytique de traitement des gaz d'échappement du moteur et/ou celle du moteur lui-même, atteint une valeur prédéterminée. Ces conditions de température déterminent le moment où le moteur et/ou le pot catalytique ont atteint un régime de fonctionnement proche de la normale, tel que l'alimentation des appareils auxiliaires en énergie mécanique devient possible sans dépassement des normes antipollution.According to a strategy for implementing the method according to the invention, the mechanical power supplied to the auxiliary apparatus is no longer reduced when the temperature of a catalytic converter for treating the engine exhaust gases and / or that of the engine itself, reaches a predetermined value. These temperature conditions determine the moment when the engine and / or the catalytic converter have reached an operating regime close to normal, such that the supply of auxiliary devices with mechanical energy becomes possible without exceeding emission standards.
Suivant une mise en oeuvre particulière du procédé selon l'invention, appliquée à un véhicule automobile équipé d'une batterie d'alimentation électrique rechargée par un appareil auxiliaire constitué par un alternateur, on réduit la puissance mécanique absorbée par 1' lternateur en réduisant l'intensité du courant d'excitation de ce dernier. Pour la mise en oeuvre du procédé suivant l'invention, 1'invention fournit un dispositif qui comprend des moyens pour réduire, pendant une phase de démarrage à froid du véhicule, la puissance mécanique fournie par le moteur à au moins un appareil auxiliaire, par rapport à celle absorbée par 1'appareil en fonctionnement normal. Dans un premier mode de réalisation du dispositif selon l'invention, lesdits moyens sont constitués par a) des moyens d'embrayage interposés entre le moteur et 1'appareil et b) des moyens de débrayage de ces moyens d'embrayage pour interrompre toute transmission de puissance mécanique du moteur vers l'appareil auxiliaire. Dans un autre mode de réalisation du dispositif selon l'invention, conçu pour un véhicule automobile équipé d'une batterie d'alimentation électrique rechargée par un alternateur, lesdits moyens de réduction de la puissance mécanique absorbée par 1'alternateur comprennent des moyens pour réduire 1'intensité du courant d'excitation de ce dernier.According to a particular implementation of the method according to the invention, applied to a motor vehicle equipped with an electric power battery recharged by an auxiliary device constituted by an alternator, the mechanical power absorbed by the generator by reducing the intensity of the latter's excitation current. For the implementation of the method according to the invention, the invention provides a device which comprises means for reducing, during a cold start phase of the vehicle, the mechanical power supplied by the engine to at least one auxiliary device, by compared to that absorbed by the device in normal operation. In a first embodiment of the device according to the invention, said means consist of a) clutch means interposed between the engine and the apparatus and b) means of disengaging these clutch means to interrupt any transmission of mechanical power from the engine to the auxiliary device. In another embodiment of the device according to the invention, designed for a motor vehicle equipped with an electrical supply battery recharged by an alternator, said means for reducing the mechanical power absorbed by the alternator comprise means for reducing The intensity of the latter's excitation current.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre et à l'examen du dessin annexé dans lequel :Other characteristics and advantages of the present invention will appear on reading the description which follows and on examining the appended drawing in which:
- la figure 1 est un schéma d'un premier mode de réalisation d'un dispositif pour la mise en oeuvre du procédé selon l'invention,FIG. 1 is a diagram of a first embodiment of a device for implementing the method according to the invention,
- la figure 2 est un schéma d'un deuxième mode de réalisation de ce dispositif, appliqué à titre d'exemple à un véhicule équipé d'une pompe de mise en pression d'un fluide utilisé dans un mécanisme de direction assistée, la figure 3 est un schéma d'un autre mode de réalisation du dispositif selon l'invention, associé à un alternateur de recharge de la batterie d'un véhicule automobile, et - la figure 4 est un organigramme d'un procédé de mise en oeuvre du dispositif de la figure 3.- Figure 2 is a diagram of a second embodiment of this device, applied by way of example to a vehicle equipped with a pump for pressurizing a fluid used in a power steering mechanism, Figure 3 is a diagram of another embodiment of the device according to the invention, associated with an alternator for recharging the battery of a motor vehicle, and - FIG. 4 is a flow diagram of a method of implementing the Figure 3 device.
Dans ces figures, où des références numériques identiques repèrent des organes ou éléments identiques ou similaires, la figure 1 fait apparaître schématiquement un moteur 1 à combustion interne propulsant un véhicule automobile, ce moteur étant alimenté en air par l'intermédiaire d'un collecteur d'admission 2, les gaz de combustion étant rejetés dans un collecteur d'échappement 3 dont la sortie peut être équipée d'un pot catalytique 4 d'oxydoréduction de certaines espèces chimiques contenues dans ces gaz, en espèces chimiques moins nocives. L'arbre de sortie 5 du moteur, classiquement raccordé à la boîte de vitesses du véhicule automobile par l'intermédiaire d'un embrayage (non représenté), est aussi classiquement raccordé par une courroie ou une chaîne 6 à un appareil auxiliaire 7 qui reçoit ainsi de 1'énergie mécanique du moteur 1, par l'intermédiaire de son arbre d'entrée 8. Pour la clarté du dessin, on a représenté un seul appareil auxiliaire 7 mais il faut comprendre que le moteur entraîne normalement plusieurs tels appareils auxiliaires, alternateur de charge de la batterie (non représentée) du véhicule, ventilateur et, optionnellement, compresseur de gaz réfrigérant formant partie d'un dispositif de climatisation du véhicule, pompe de mise en pression d'un fluide utilisé dans un dispositif de suspension ou de direction assistée de ce véhicule, etc..., comme on l'a vu plus haut.In these figures, where numerical references identical identify identical or similar members or elements, FIG. 1 shows schematically an internal combustion engine 1 propelling a motor vehicle, this engine being supplied with air via an intake manifold 2, the combustion gases being discharged into an exhaust manifold 3, the outlet of which can be fitted with a catalytic converter 4 for redoxing certain chemical species contained in these gases, into less harmful chemical species. The output shaft 5 of the engine, conventionally connected to the gearbox of the motor vehicle via a clutch (not shown), is also conventionally connected by a belt or chain 6 to an auxiliary device 7 which receives thus the mechanical energy of the motor 1, via its input shaft 8. For clarity of the drawing, a single auxiliary device 7 has been shown, but it should be understood that the engine normally drives several such auxiliary devices, vehicle battery charging alternator (not shown), fan and, optionally, refrigerant gas compressor forming part of a vehicle air conditioning system, pump for pressurizing a fluid used in a suspension or power steering of this vehicle, etc ..., as we saw above.
Il est clair que la multiplication de tels appareils auxiliaires, si elle accroît le confort du véhicule, accroît simultanément la charge supportée par le moteur dès son démarrage, ces appareils étant classiquement constamment couplés mécaniquement au moteur. Il en résulte, pendant une phase de démarrage du moteur, la nécessité de faire fonctionner celui-ci à un régime suffisamment élevé pour qu'il puisse délivrer le couple nécessaire pour vaincre simultanément les frottements internes s'opposant à sa rotation et les frottements externes sOpposant à l'animation des appareils auxiliaires. Le couple élevé qu'il développe alors entraîne une forte production de gaz d'échappement que le pot catalytique 4 ne peut purger de ses espèces nocives du fait que ce pot n'a pas alors atteint sa température de régime, qui se situe normalement autour de 700°C. Les gaz d'échappement polluent alors l'environnement d'une manière jugée inacceptable par certaines normes antipollution. C'est le but de la présente invention que de faire en sorte que ces normes soient respectées par les émissions du moteur 1.It is clear that the multiplication of such auxiliary devices, if it increases the comfort of the vehicle, simultaneously increases the load supported by the engine as soon as it is started, these devices being conventionally constantly mechanically coupled to the engine. As a result, during a starting phase of the engine, the need to operate it at a sufficiently high speed so that it can deliver the torque necessary to simultaneously overcome the internal friction opposing its rotation and the external friction. Opposing the animation of auxiliary devices. The high torque it develops then leads to a high production of gas exhaust that the catalytic converter 4 can not purge of its harmful species because this pot has not then reached its operating temperature, which is normally around 700 ° C. The exhaust gases then pollute the environment in a manner deemed unacceptable by certain emission standards. It is the object of the present invention to ensure that these standards are met by the emissions from engine 1.
Pour ce faire, suivant un premier mode de réalisation de l'invention, on équipe l'arbre d'entrée 8 de l'appareil auxiliaire 7 d'un organe d'embrayage 9 dont le débrayage permet de supprimer toute transmission d'énergie mécanique entre le moteur et l'appareil auxiliaire 7. Optionnellement, cet organe d'embrayage pourrait être prévu en 10, sur l'arbre de sortie du moteur.To do this, according to a first embodiment of the invention, the input shaft 8 of the auxiliary device 7 is fitted with a clutch member 9, the disengagement of which eliminates any transmission of mechanical energy. between the engine and the auxiliary device 7. Optionally, this clutch member could be provided at 10, on the engine output shaft.
Un calculateur électronique 11 à microprocesseur 12 équipe classiquement le véhicule, pour commander par exemple l'allumage et/ou l'injection de carburant dans le moteur 1. Ce calculateur reçoit de divers capteurs des signaux S représentatifs de la température d'eau de refroidissement du moteur, de la température des gaz d'échappement, du régime et de la pression d'admission du moteur, etc.. pour en déduire des commandes appropriées des organes d'allumage et d'injection. Suivant la présente invention, on prévoit dans ce calculateur des moyens logiciels et matériels nécessaires à la commande de 1'organe d'embrayage 9. Bien entendu ces moyens pourraient être agencés hors de ce calculateur mais la présence de celui-ci dans le véhicule rend cette solution particulièrement commode et économique.An electronic computer 11 with microprocessor 12 conventionally equips the vehicle, for controlling for example the ignition and / or the injection of fuel into the engine 1. This computer receives from various sensors signals S representative of the cooling water temperature of the engine, of the temperature of the exhaust gases, of the speed and of the intake pressure of the engine, etc. in order to deduce therefrom appropriate commands from the ignition and injection members. According to the present invention, there is provided in this computer software and hardware means necessary for controlling the clutch member 9. Of course these means could be arranged outside this computer, but the presence of the latter in the vehicle makes this particularly convenient and economical solution.
C'est ainsi que, pendant une phase de démarrage du moteur détectée par le calculateur 11, le microprocesseur 12 commande, par l'intermédiaire d'un étage de puissance 13, le débrayage de 1'organe 9, pour soulager alors le moteur de la charge supplémentaire que lui imposerait autrement 1'appareil auxiliaire 7.Thus, during a starting phase of the engine detected by the computer 11, the microprocessor 12 controls, via a power stage 13, the disengagement of the member 9, to then relieve the engine from the additional load the auxiliary device would otherwise impose on it 7.
On conçoit qu'en débrayant ainsi plusieurs appareils auxiliaires non essentiels au démarrage du moteur, comme c'est le cas d'un alternateur de charge de la batterie, d'une pompe d'alimentation d'un dispositif de direction assistée ou d'un compresseur de dispositif de climatisation, on réduit sensiblement la charge du moteur au démarrage et donc sa production de gaz d'échappement, ce qui permet de respecter les normes antipollution mentionnées plus haut, malgré l'inefficacité actuelle d'un pot catalytique éventuellement monté en sortie du collecteur d'échappement du moteur.We understand that by disengaging several devices non-essential auxiliaries when starting the engine, as in the case of a battery charging alternator, a power supply pump for a power steering device or an air conditioning compressor, significantly the engine load at start-up and therefore its exhaust gas production, which makes it possible to comply with the abatement standards mentioned above, despite the current ineffectiveness of a catalytic converter possibly fitted at the outlet of the engine exhaust manifold .
Ces normes définissent des cycles de fonctionnement du moteur pour lesquels on observe que l'essentiel de la production d'espèces nocives intervient dans les toutes premières minutes, après le début de fonctionnement du moteur, démarré à froid. Un soulagement du moteur pendant ces premières minutes est donc essentiel au respect des normes fixées. Le calculateur détermine aussi le moment où, le moteur et/ou le pot catalytique 4 ayant atteint une température suffisante proche de leur température de régime, les gaz d'échappement sont suffisamment débarrassés d'espèces nocives pour que 1'activation des appareils auxiliaires puisse être autorisée de manière à améliorer le confort du véhicule (climatisation, direction assistée) ou assurer la recharge de la batterie (alternateur) . Divers organes d'embrayages classiques, électromagnétiques, électromécaniques ouélectrohydrauliques peuvent être utilisés pour mettre en oeuvre 1'invention de manière peu coûteuse.These standards define engine operating cycles for which it is observed that most of the production of harmful species occurs in the very first minutes, after the engine has started running, started cold. Relieving the engine during these first few minutes is therefore essential for compliance with the standards set. The computer also determines the moment when, the engine and / or the catalytic converter 4 having reached a sufficient temperature close to their operating temperature, the exhaust gases are sufficiently free of harmful species so that the activation of the auxiliary devices can be authorized in order to improve the comfort of the vehicle (air conditioning, power steering) or ensure battery recharging (alternator). Various conventional, electromagnetic, electromechanical or electro-hydraulic clutch members can be used to implement the invention inexpensively.
On a représenté à la figure 2, un autre mode de réalisation du dispositif suivant l'invention, conçu plus particulièrement pour réduire ou annuler la charge imposée sur 1'arbre de sortie du moteur 1 par une pompe P entraînée par ce moteur pour alimenter en fluide sous pression un vérin V formant partie d'un dispositif de direction assistée D. La pompe est alimentée par un réservoir 14. Un conduit de retour 15 est placé classiquement entre la pompe et le réservoir, alors que la pompe débite dans une ligne 16 d'alimentation du vérin.FIG. 2 shows another embodiment of the device according to the invention, designed more particularly to reduce or cancel the load imposed on the output shaft of the motor 1 by a pump P driven by this motor to supply fluid under pressure a jack V forming part of a power steering device D. The pump is supplied by a reservoir 14. A return duct 15 is conventionally placed between the pump and the reservoir, while the pump delivers in a line 16 cylinder power supply.
Suivant la présente invention, on dispose, entre la ligne 16 d'alimentation du vérin V et le conduit 15, un conduit de dérivation 17 sur lequel est monté une électrovanne 18 normalement fermée et commandée par le calculateur 11. Lors d'un démarrage à froid, le calculateur peut ainsi actionner 1'électrovanne 18 pour ouvrir le conduit 17. La sortie de la pompe se décharge alors dans le réservoir en empêchant la montée en pression du fluide alimentant le vérin V. La charge de la pompe sur le moteur est alors fortement réduite, avec diminution corrélative de la production de gaz d'échappement.According to the present invention, there is, between the supply line 16 of the cylinder V and the conduit 15, a bypass conduit 17 on which is mounted a solenoid valve 18 normally closed and controlled by the computer 11. During a start-up at cold, the computer can thus actuate the solenoid valve 18 to open the duct 17. The pump outlet then discharges into the tank, preventing the rise in pressure of the fluid supplying the jack V. The load of the pump on the engine is then greatly reduced, with a corresponding decrease in the production of exhaust gases.
On peut utiliser une électrovanne à perte de charge variable qui permet de moduler la réduction de la charge appliquée au moteur par la pompe, suivant une commande programmée dans le calculateur.A variable pressure drop solenoid valve can be used which modulates the reduction in the load applied to the motor by the pump, following a command programmed in the computer.
Diverses stratégies de commande de la pompe sont applicables, au choix du concepteur. A titre d'exemple d'une telle stratégie, on peut citer celle qui consiste à assurer 1'alimentation du vérin en fluide haute pression seulement si la température du moteur, lue par un capteur 19 de température du liquide de refroidissement, est supérieure à une valeur de seuil (60°C par exemple) et si la température des gaz d'échappement lue par un capteur de température 20 placé à la sortie du pot catalytique 4 est supérieure à une autre valeur de seuil (350°C par exemple), ou si le véhicule roule, comme cela est détectable à l'aide d'un capteur de vitesse 21 sensible à la rotation d'une roue 22 du véhicule.Various pump control strategies are applicable, at the discretion of the designer. As an example of such a strategy, mention may be made of ensuring that the cylinder is supplied with high pressure fluid only if the engine temperature, read by a coolant temperature sensor 19, is greater than a threshold value (60 ° C for example) and if the temperature of the exhaust gases read by a temperature sensor 20 placed at the outlet of the catalytic converter 4 is higher than another threshold value (350 ° C for example) , or if the vehicle is moving, as is detectable using a speed sensor 21 sensitive to the rotation of a wheel 22 of the vehicle.
A la figure 3, on a schématisé un dispositif suivant l'invention, conçu pour délester le moteur de la charge que lui impose normalement l'entraînement d'un alternateur 23 assurant classiquement la charge de la batterie 24 du véhicule par l'intermédiaire d'un circuit 25, l'alternateur comprenant en outre un ou plusieurs enroulements d'excitation 26 alimentés par un courant d'excitation i, comme il est bien connu.In Figure 3, there is shown schematically a device according to the invention, designed to relieve the engine of the load normally imposed on it by the drive of an alternator 23 conventionally ensuring the charge of the battery 24 of the vehicle by means of a circuit 25, the alternator further comprising one or more excitation windings 26 supplied by an excitation current i, as is well known.
Suivant la présente invention, l'intensité i de ce courant d'excitation peut être réglée par le calculateur il, dont le microprocesseur 12 est dûment programmé pour commander ce courant, par l'intermédiaire d'un transistor de puissance 13 placé en série avec 1'enroulement d'excitation 26, entre la borne positive de la batterie et la masse.According to the present invention, the intensity i of this excitation current can be adjusted by the computer il, whose microprocessor 12 is duly programmed to control this current, by means of a power transistor 13 placed in series with the excitation winding 26, between the terminal positive battery and ground.
On sait que, classiquement, le moteur et l'alternateur sont couplés en permanence par une courroie d'entraînement 6 et que, par conséquent, le moteur doit fournir à l'alternateur un couple, y compris en phase de démarrage, ce couple étant fonction croissante du courant d'excitation i. En réduisant ou en annulant, suivant l'invention, ce courant d'excitation pendant une phase de démarrage à froid, on réduit considérablement ce couple et donc la charge du moteur qui, ainsi délesté peut démarrer en tournant à un régime plus bas développant moins de gaz d'échappement et donc une moindre pollution, propre à satisfaire aux normes. Diverses stratégies de commande du courant d'excitation peuvent être programmées dans le microprocesseur. L'organi¬ gramme de la figure 4 illustre l'une d'entre elles, donnée seulement à titre d'exemple. Suivant cette stratégie, on compare la tension de sortie de la batterie 24, connue par l'une des entrées 27 du calculateur 11, à une tension de seuil, de 10 volts par exemple, si la tension nominale de la batterie est de 12 volts. Si la tension fournie par la batterie est inférieure au seuil, le courant d'excitation de 1'alternateur est réglé à sa valeur maximum pour accélérer la charge de la batterie et le retour de la tension de sortie de celle-ci à sa valeur nominale, nécessaire à un bon fonctionnement du véhicule. Par contre, si au démarrage à froid du véhicule tel qu'il peut être détecté par le calculateur par tout moyen connu, la tension de sortie de la batterie est supérieure au seuil, la stratégie consiste à réduire l'intensité du courant d'excitation de 1'alternateur aussi longtemps que le moteur 1 et le pot catalytique 4 n'auront pas atteint des températures suffisamment voisines de leurs températures de régime pour que la quantité des espèces nocives contenues dans les gaz traités par le catalyseur soit alors maintenue dans les limites posées par les normes à respecter. C'est ainsi que, par exemple, le courant d'excitation sera réduit aussi longtemps que la température du liquide de refroidissement, représentative de celle du moteur, sera inférieure à 60°C et que la température des gaz d'échappement, représentative de celle du pot catalytique, sera inférieure à 350CC.It is known that, conventionally, the engine and the alternator are permanently coupled by a drive belt 6 and that, consequently, the engine must supply the alternator with a torque, including in the starting phase, this torque being increasing function of the excitation current i. By reducing or canceling, according to the invention, this excitation current during a cold start phase, this torque is considerably reduced and therefore the load on the motor which, thus relieved of stress, can start by turning at a lower speed developing less exhaust gas and therefore less pollution, capable of meeting standards. Various strategies for controlling the excitation current can be programmed in the microprocessor. The flow diagram of FIG. 4 illustrates one of them, given only by way of example. According to this strategy, the output voltage of the battery 24, known by one of the inputs 27 of the computer 11, is compared with a threshold voltage, of 10 volts for example, if the nominal voltage of the battery is 12 volts . If the voltage supplied by the battery is below the threshold, the excitation current of the alternator is adjusted to its maximum value to accelerate the charging of the battery and the return of its output voltage to its nominal value. , necessary for the proper functioning of the vehicle. On the other hand, if at cold start of the vehicle as it can be detected by the computer by any known means, the battery output voltage is above the threshold, the strategy consists in reducing the intensity of the excitation current of the alternator as long as the engine 1 and the catalytic converter 4 have not reached temperatures sufficiently close to their operating temperatures so that the quantity of harmful species contained in the gases treated by the catalyst is then kept within the limits set by the standards to be observed. Thus, for example, the excitation current will be reduced as long as the temperature of the coolant, representative of that of the engine, is lower than 60 ° C and that the temperature of the exhaust gases, representative of that of the catalytic converter, will be less than 350 C C.
Le courant d'excitation i peut alors être fixé, de manière à limiter la puissance absorbée par 1'alternateur tout en assurant une charge minimum de la batterie, par exemple à une valeur donnée par la formule : i ≈ k/N, où k est une constante et N le régime du moteur en tr/mn, mesuré par un capteur 28, à réluctance variable par exemple. Une fois atteints les seuils de température mentionnés ci- dessus, le courant i est réglé à sa valeur maximum pour assurer une charge convenable de la batterie.The excitation current i can then be fixed, so as to limit the power absorbed by the alternator while ensuring a minimum charge of the battery, for example at a value given by the formula: i ≈ k / N, where k is a constant and N the engine speed in rpm, measured by a sensor 28, with variable reluctance for example. Once the temperature thresholds mentioned above have been reached, the current i is set to its maximum value to ensure a suitable charge of the battery.
Bien entendu 1'invention n'est pas limitée aux modes de réalisation décrits et représentés qui n'ont été donnés qu'à titre d'exemple. C'est ainsi que l'invention n'est pas limitée à un dispositif de commande de l'un seulement des appareils auxiliaires mentionnés ci-dessus. Un dispositif suivant 1'invention pourrait commander simultanément le découplage total ou partiel de l'alternateur, d'une pompe, d'un compresseur etc.. En outre, dans un véhicule équipé d'un mécanisme d'embrayage automatique du moteur, le dispositif suivant 1'invention pourrait assurer le débrayage de cet embrayage en phase de démarrage à froid, de manière à délester le moteur de la charge que lui impose la boîte de vitesses, quand bien même celle-ci est alors au point mort.Of course the invention is not limited to the embodiments described and shown which have been given only by way of example. Thus, the invention is not limited to a device for controlling only one of the above-mentioned auxiliary devices. A device according to the invention could simultaneously control the total or partial decoupling of the alternator, a pump, a compressor, etc. Furthermore, in a vehicle equipped with an automatic engine clutch mechanism, the device according to the invention could disengage this clutch during the cold start phase, so as to relieve the engine of the load imposed on it by the gearbox, even if the latter is then in neutral.
La présente invention apporte de nombreux avantages. En phase de démarrage du véhicule, elle permet de minimiser la pollution malgré la présence de nombreux appareils auxiliaires installés pour améliorer le confort du véhicule. L'invention peut apporter une réduction de 10 à 20 % environ dans les émissions d'hydrocarbures imbrûlés et d'oxyde de carbone pendant un cycle normalisé de démarrage. Elle permet aussi de modeler la stratégie de commande de 1'alimentation en énergie mécanique des appareils auxiliaires, de manière à obtenir tel ou tel compromis optimal entre le contrôle des émissions de gaz polluants, le confort du véhicule et la recharge de la batterie. La commande de l'alternateur par le calculateur permet en outre, incidemment, l'installation de fonctions de diagnostic du fonctionnement des moyens de charge de cette batterie, dont on peut optimiser les dimensions grâce à la recharge contrôlée établie par la présente invention. The present invention provides many advantages. In the vehicle start-up phase, it minimizes pollution despite the presence of numerous auxiliary devices installed to improve vehicle comfort. The invention can bring a reduction of approximately 10 to 20% in the emissions of unburnt hydrocarbons and of oxide of carbon during a standardized start-up cycle. It also makes it possible to model the strategy for controlling the supply of mechanical energy to the auxiliary devices, so as to obtain such or such an optimal compromise between controlling the emission of polluting gases, the comfort of the vehicle and recharging the battery. The control of the alternator by the computer also makes it possible, incidentally, to install diagnostic functions for the operation of the charging means of this battery, the dimensions of which can be optimized by means of the controlled recharging established by the present invention.

Claims

REVENDICATIONS
1. Procédé de réduction des émissions de gaz nocifs produites par un moteur à combustion interne (1) propulsant un véhicule automobile et fournissant de l'énergie mécanique à au moins un appareil auxiliaire (7;P;23) formant partie de ce véhicule, caractérisé en ce que, pendant une phase de démarrage à froid du véhicule, on réduit la puissance mécanique fournie par le moteur (1) à 1'appareil auxiliaire (7;P;23) par rapport à celle absorbée par l'appareil en fonctionnement normal.1. Method for reducing harmful gas emissions produced by an internal combustion engine (1) propelling a motor vehicle and supplying mechanical energy to at least one auxiliary device (7; P; 23) forming part of this vehicle, characterized in that, during a cold starting phase of the vehicle, the mechanical power supplied by the engine (1) to the auxiliary device (7; P; 23) is reduced compared to that absorbed by the device in operation normal.
2. Procédé conforme à la revendication 1, caractérisé en ce qu'on découple l'appareil (7) du moteur (1) pendant ladite phase de démarrage.2. Method according to claim 1, characterized in that the device (7) is decoupled from the motor (1) during said start-up phase.
3. Procédé conforme à 1'une quelconque des revendications 1 et 2, caractérisé en ce qu'on cesse de réduire la puissance mécanique fournie à 1'appareil auxiliaire quand la température du moteur (1) atteint une valeur prédéterminée.3. Method according to any one of claims 1 and 2, characterized in that it ceases to reduce the mechanical power supplied to the auxiliary device when the temperature of the engine (1) reaches a predetermined value.
4. Procédé conforme à 1'une quelconque des revendications 1 à 3, caractérisé en ce qu'on cesse de réduire la puissance mécanique fournie à 1'appareil auxiliaire quand la température d'un pot catalytique (4) de traitement des gaz d'échappement du moteur atteint une valeur prédéterminée. 4. Method according to any one of claims 1 to 3, characterized in that it ceases to reduce the mechanical power supplied to the auxiliary device when the temperature of a catalytic converter (4) for treating gas engine exhaust reaches a predetermined value.
5. Procédé conforme à l'une quelconque des revendications 1 à 4, appliqué à un véhicule automobile équipé d'une batterie d'alimentation électrique rechargée par un appareil auxiliaire constitué par un alternateur (23), caractérisé en ce qu'on réduit la puissance mécanique absorbée par 1'alternateur (23) en réduisant 1'intensité du courant d'excitation (i) de ce dernier.5. Method according to any one of claims 1 to 4, applied to a motor vehicle equipped with an electric power battery recharged by an auxiliary device consisting of an alternator (23), characterized in that the mechanical power absorbed by the alternator (23) by reducing the intensity of the excitation current (i) of the latter.
6. Procédé conforme à la revendication 5, caractérisé en ce qu'on ne réduit 1'intensité du courant d'excitation (i) que si la tension de sortie de la batterie est supérieure à une valeur prédéterminée.6. Method according to claim 5, characterized in that the intensity of the excitation current (i) is reduced only if the output voltage of the battery is greater than a predetermined value.
7. Dispositif pour la mise en oeuvre du procédé conforme à l'une quelconque des revendications l à 6, caractérisé en ce qu'il comprend des moyens (9;18;13) pour réduire, pendant une phase de démarrage à froid du véhicule, la puissance mécanique fournie par le moteur à l'appareil auxiliaire, par rapport à celle absorbée par l'appareil en fonctionnement normal.7. Device for implementing the method according to any one of claims l to 6, characterized in that it comprises means (9; 18; 13) for reducing, during a cold start phase of the vehicle, the mechanical power supplied by the engine to the auxiliary device, compared to that absorbed by the device in normal operation.
8. Dispositif conforme à la revendication 7, caractérisé en ce que lesdits moyens sont constitués par a) des moyens d'embrayage (9) interposés entre le moteur (1) et 1'appareil (7) et b) des moyens de commande de débrayage (12,13) de ces moyens pour interrompre temporairement toute transmission de puissance mécanique du moteur (1) vers 1'appareil auxiliaire (7).8. Device according to claim 7, characterized in that said means consist of a) clutch means (9) interposed between the engine (1) and the device (7) and b) control means of disengaging (12,13) of these means for temporarily interrupting any transmission of mechanical power from the engine (1) to the auxiliary device (7).
9. Dispositif conforme à la revendication 7, conçu pour un véhicule automobile comprenant un appareil auxiliaire constitué par une pompe d'alimentation (P) en fluide sous pression, caractérisé en ce que lesdits moyens de réduction comprennent une vanne (18) permettant de commuter sélectivement la sortie de la pompe ou du compresseur sur un réservoir (14) d'alimentation en fluide de la pompe. 9. Device according to claim 7, designed for a motor vehicle comprising an auxiliary device constituted by a supply pump (P) in pressurized fluid, characterized in that said reduction means comprise a valve (18) for switching selectively the output of the pump or compressor on a reservoir (14) for supplying fluid to the pump.
10. Dispositif conforme à la revendication 7, conçu pour un véhicule automobile équipé d'une batterie d'alimentation électrique rechargée par un appareil auxiliaire constitué par un alternateur (23), caractérisé en ce que lesdits moyens de réduction de la puissance mécanique absorbée par l'alternateur comprennent des moyens (12,13) pour commander une réduction de l'intensité du courant d'excitation (i) de ce dernier.10. Device according to claim 7, designed for a motor vehicle equipped with an electric power battery recharged by an auxiliary device constituted by an alternator (23), characterized in that said means for reducing the mechanical power absorbed by the alternator comprises means (12, 13) for controlling a reduction in the intensity of the excitation current (i) of the latter.
11. Dispositif conforme à la revendication 10, comprenant des moyens de mesure de la tension de sortie de la batterie, caractérisé en ce qu'il comprend des moyens pour interdire toute réduction du courant d'excitation quand ladite tension est inférieure à une valeur prédéterminée.11. Device according to claim 10, comprising means for measuring the battery output voltage, characterized in that it comprises means for preventing any reduction in the excitation current when said voltage is less than a predetermined value .
12. Dispositif conforme à l'une quelconque des revendications 8 à 11, caractérisé en ce que lesdits moyens de commande (12,13) sont incorporés à un calculateur (11) de commande d'allumage et/ou d'injection du moteur.12. Device according to any one of claims 8 to 11, characterized in that said control means (12,13) are incorporated in a computer (11) for controlling the ignition and / or injection of the engine.
13. Dispositif conforme à la revendication 12, le calculateur étant alimenté par un capteur (20) de température d'un pot catalytique (4) de traitement des gaz d'échappement du moteur, caractérisé en ce qu'il comprend des moyens pour mettre un terme à la réduction de la puissance mécanique demandée par 1'appareil auxiliaire quand ladite température dépasse une valeur prédéterminée.13. Device according to claim 12, the computer being supplied by a temperature sensor (20) of a catalytic converter (4) for treating the engine exhaust gas, characterized in that it comprises means for halting the reduction in the mechanical power required by the auxiliary apparatus when said temperature exceeds a predetermined value.
14. Dispositif conforme à l'une quelconque des revendications 12 et 13, le calculateur étant alimenté par un capteur de température (19) du moteur, caractérisé en ce qu'il comprend des moyens pour mettre un terme à la réduction de la puissance mécanique demandée par 1'appareil auxiliaire quand la température du moteur dépasse une valeur prédéterminée. 14. Device according to any one of claims 12 and 13, the computer being supplied by a temperature sensor (19) of the engine, characterized in that it comprises means for halting the reduction in mechanical power requested by the auxiliary device when the engine temperature exceeds a predetermined value.
EP94905069A 1993-01-29 1994-01-17 Method and device for reducing harmful gas emissions from a motor vehicle internal combustion engine Expired - Lifetime EP0681646B1 (en)

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FR9300960A FR2701062B1 (en) 1993-01-29 1993-01-29 Method and device for reducing harmful gas emissions produced by an internal combustion engine propelling a motor vehicle.
FR9300960 1993-01-29
PCT/EP1994/000105 WO1994017296A1 (en) 1993-01-29 1994-01-17 Method and device for reducing harmful gas emissions from a motor vehicle internal combustion engine

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Also Published As

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FR2701062B1 (en) 1995-04-07
WO1994017296A1 (en) 1994-08-04
KR960700399A (en) 1996-01-20
ES2100694T3 (en) 1997-06-16
DE69402532T2 (en) 1997-09-25
US5836151A (en) 1998-11-17
DE69402532D1 (en) 1997-05-15
FR2701062A1 (en) 1994-08-05
EP0681646B1 (en) 1997-04-09
KR100333228B1 (en) 2002-10-31

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