EP1146221A1 - Alarm and/or control device for diesel engines, especially for automotive vehicles - Google Patents

Alarm and/or control device for diesel engines, especially for automotive vehicles Download PDF

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Publication number
EP1146221A1
EP1146221A1 EP01400675A EP01400675A EP1146221A1 EP 1146221 A1 EP1146221 A1 EP 1146221A1 EP 01400675 A EP01400675 A EP 01400675A EP 01400675 A EP01400675 A EP 01400675A EP 1146221 A1 EP1146221 A1 EP 1146221A1
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EP
European Patent Office
Prior art keywords
fuel
level
detection
engine
regulator
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Granted
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EP01400675A
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German (de)
French (fr)
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EP1146221B1 (en
Inventor
M. Patrice Le Tallec
M. Christian Laurent
M. Daniel Riou
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel

Definitions

  • the invention relates to an alarm device and / or control for a diesel engine, in particular for a vehicle automobile.
  • a diesel engine is supplied with pressurized fuel thanks to a pump supply circuit.
  • the pump fills with air and, trapped air prevents suction liquid fuel.
  • the invention results from the observation that this driver alert using single minimum level indicator is insufficient to avoid the defusing incident of the pump, linked to the breakdown. Indeed, the driver knowing that it can still travel a comfortable distance - by example of the order of a good hundred kilometers - from the minimum level warning light comes on, its vigilance is not not maximum and loosening of attention can cause it to drive until the fuel tank is empty.
  • a means is provided for alerting the driver of the vehicle the risk of incident when the level of the fuel drops below a second level, substantially lower than the first minimum level.
  • the risk alert for defusing the fuel system pump will be supplied that a relatively short time (or a relatively short distance low) before the incident is likely to actually happen, so that this second alert occurs infrequently. Indeed, if the distance remaining was too great after this second alert, the driver would also risk going there accustom, which would relax his vigilance.
  • the alert for the risk of the pump priming may consist of a light or sound signal. She may also consist of a command to decrease performance of the engine, its idling, or its complete stop. These various commands can also intervene successively: engine performance is first decreased, then it is idled, and finally stopped before the pump is primed. When we plan a light or sound alert, this can also occur before or during the automatic performance decrease command of the motor.
  • the invention is not limited to a Diesel engine for motor vehicle. It applies to all the uses of diesel engines since it allows stopping automatic or manual engine just before the (or the) fuel system pump (s) fills with air.
  • a distance and / or distance counter is provided fuel consumption from the first level and the alert risk of defusing is triggered when the distance traveled and / or consumption since this first level, reached a specified limit.
  • At least one signal is used measurement or control of this regulation.
  • the error signal (the difference between a real value and a value filling or pressure regulation) exceeds a limit value and / or the control signals of the regulation have instabilities.
  • the latter type of detection is preferably used in order to trigger the performance decrease, the engine idling or stopping.
  • this difference indicates immediate proximity of the area at real risk of defusing.
  • the command means to avoid defusing the pump is performed only when the risk is imminent. So with a normally attentive and careful driver, this order will occur very rarely, which will attract all the more attention when it occurs.
  • a common rail diesel engine has a conduit in which the fuel arrives under high pressure, solenoid valves connecting this conduit to each of cylinders, and means for controlling these solenoid valves allow provide each cylinder with the optimum amount of fuel at the optimal time and with optimal pressure.
  • the second level detection means are put into operation only after detection of the first level.
  • the invention thus relates to a device for alerting the proximity of an incident in a diesel engine vehicle, which is characterized in that the incident being the risk of defusing at least one fuel supply pump, it comprises means for detecting that the fuel level has gone down below a second level, significantly lower than first minimum level from which an alarm is triggered advising the filling of this tank.
  • a means is, for example, provided for reducing performance of the engine, this means being triggered by the means of detection.
  • a means is provided for imposing engine idling speed when the detection means indicates the proximity of the incident.
  • the detection means comprises means for detecting the distance traveled from the detection of the first minimum fuel level and a means to compare this distance to a predetermined limit.
  • a means is provided for determining fuel consumption from the detection of the first minimum fuel level and a way to compare this consumption at a predetermined limit.
  • the motor includes a regulator filling with fuel and the detection means comprises a means for monitoring a parameter of the filling regulator.
  • the parameter of the filling regulator is by example the error signal, means being provided for comparing this error signal to a predetermined limit.
  • the engine includes a fuel pressure regulator and detection means includes means for monitoring a parameter of this regulator pressure.
  • the parameter of the pressure regulator is for example the error signal, a means being provided for comparing this signal error at a predetermined limit.
  • the parameter of the pressure regulator can be the degree of pressure or current control stability of the pressure regulator.
  • the sensing means can be a means to monitor the pressure in the common rail.
  • the invention also relates to a device for alerting the proximity of a diesel engine power supply incident to feed pump, which characterized in that the incident being the risk of defusing at least one feed pump fuel, and the engine comprising a filling regulator or fuel pressure, it includes means for detecting an abnormal value of a regulation parameter.
  • a diesel engine has a pump 10 for the fuel supply 14 (FIG. 1) of a high pump pressure 16.
  • the feed pump 10 is, in the example, disposed in a reservoir 12.
  • the pump 10 is arranged in the conduit 18 connecting the reservoir to the pump 16. In another variant (also not shown), it is integrated into the high pressure pump 16.
  • the injection pump 16 is intended to put the fuel under a high pressure of the order of 200 to 1500 bars, depending on the operating point of the engine. It feeds a line 22 intended for injecting pressurized fuel into each of the engine cylinders by means of solenoid valves 24 1 , 24 2 , etc.
  • a computer or central control member 30 is provided for controlling, on the one hand, a filling regulator 20 upstream of the pump 16, and, on the other hand, a pressure regulator 17 of the injection pump 16 thus that the instant of opening of the solenoid valves 24 1 , 24 2 , etc.
  • the computer 30 also performs the usual functions a motor vehicle control unit, i.e. that it totals the distance traveled and the consumption and it controls the filling regulation and / or the regulation of pressure. To this end, the computer 30 receives a signal measurement of a pressure sensor 23 in the common rail 22 and checks the control signals of the filling regulation and / or pressure regulation 17.
  • the computer 30 performs a command according to the diagram in Figure 2.
  • the alarm or control function is only activated from when fuel level 14 drops below one first level which, in the simplest way, is the usual level minimum level alert, i.e. about 10% of the contents of the reservoir 12.
  • This step is represented by block 32 on the Figure 2. From this step 32, the computer 30 determines distance traveled (block 34) and fuel consumption (block 36).
  • the distance traveled is compared to a predetermined limit D r (block 38). If this distance traveled exceeds the limit D r , the performance of the motor is reduced (block 40).
  • a predetermined limit D r for example, means are provided for reducing the maximum speed and / or limiting the speed of rotation of the engine and / or limiting the fuel supply.
  • the fuel consumption is compared with a predetermined limit V r (block 42) and if the consumption exceeds the limit V r , the engine performance is also reduced.
  • the computer 30 monitors (blocks 39 and 43) also the filling and / or pressure regulator 20 17 and indicates whether the regulation exhibits drifts (blocks 44 and 46). Engine performance is reduced (block 40) when such drifts occur.
  • the error signal is measured, i.e. the difference between the actual value and the desired value (the instructions). If this deviation exceeds a determined limit, this deviation is an indicator of the approach to the dry breakdown and therefore to defusing of pump 10 or 16.
  • the pressure difference is measured thanks to the pressure sensor 23 in the duct 22.
  • the computer 30 monitors (block 48) also at minus one parameter of the pump pressure regulator 17. For example, if the pressure in this regulator 17 cannot reach the setpoint, i.e. if the difference between the actual pressure and the set pressure is greater than a predetermined value, this situation also indicates, and safely, the approach of the blackout, that is to say that the pump 10 or 16 starts sucking in air at the same time as fuel. Furthermore, in this situation, the regulation presents instabilities, the error signal undergoing strong oscillations. These instabilities also certainly provide the information that pumps 10 and 16 are about to defuse.
  • a light alarm is provided on the vehicle dashboard or an audible alarm which indicates to the driver that he is near the defusing pump 10 or 16.
  • the invention therefore consists in alerting (by an alarm or an action on the engine) the driver (or, more generally, the user of a Diesel engine) of the risk of incident when the fuel level drops below a second level, significantly lower than the first minimum level indicated by block 32.
  • This second level can be detected by various means. Direct detection of the second level or totalization consumption (blocks 36 and 42) are not essential for this detection. Indeed, each of the various other parameters such as distance traveled (blocks 34 and 38), measurement of filling regulation drifts (blocks 44 and 46), as well as instability or drift measurements in the pressure 17 (block 48) each constitute, in themselves, indicators the fact that the tank level has dropped below second level.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The alarm/controller detects misfiring of the engines fuel pump (10). It includes a fuel level sensing unit (34) to which detects when the fuel has fallen below a second level less than a first minimum level from which an alarm (32) is triggered to warn that filling is required. The sensing unit computes the distance traveled from detection of the first minimum fuel level another unit (36) compares this distance with a set limit (Dr). The alarm/controller includes a unit (40), triggered by the sensor, which reduces the engines performance and a unit (52) which slows down the engine operating regime when the sensor indicates falling fuel level, by interrupting the fuel supply. The unit (36) determines fuel consumption from detection of the first minimum level and a unit (42) compares this fuel consumption with a set limit (Vf). The engine includes a fuel filling regulator (20) and the sensor includes a unit (39) to monitor an error signal of the regulator by comparing it with a set limit.

Description

L'invention est relative à un dispositif d'alarme et/ou de commande pour moteur Diesel, notamment pour véhicule automobile.The invention relates to an alarm device and / or control for a diesel engine, in particular for a vehicle automobile.

Un moteur Diesel est alimenté en carburant sous pression grâce à un circuit d'alimentation à pompe. Lorsque le réservoir est complètement vide, la pompe se remplit d'air et, après remplissage du réservoir, l'air emprisonné empêche l'aspiration du carburant liquide.A diesel engine is supplied with pressurized fuel thanks to a pump supply circuit. When the tank is completely empty, the pump fills with air and, trapped air prevents suction liquid fuel.

Ainsi, quand un véhicule à moteur Diesel tombe en "panne sèche", il faut, après remplissage du réservoir, chasser l'air de la pompe. Cette opération, appelée "réamorçage", nécessite en général une intervention de l'utilisateur ; le plus souvent, il doit actionner une pompe de réamorçage à commande manuelle ou faire intervenir une pompe à commande électrique. Certains conducteurs peuvent aussi avoir tendance à faire appel à un réparateur.So when a diesel engine vehicle falls into "dry breakdown", it is necessary, after filling the tank, to flush pump air. This operation, called "rebooting", requires generally user intervention; most of the time, it must activate a primed priming pump manual or use an electrically controlled pump. Some drivers may also tend to appeal to a repairman.

Ce type d'incident étant particulièrement désagréable pour le conducteur, les constructeurs automobiles attirent l'attention des utilisateurs sur le fait qu'ils doivent passer à la pompe le plus tôt possible après que le contenu du réservoir en carburant soit descendu au-dessous d'un niveau minimum qui lui est signalé le plus souvent par l'allumage d'un voyant.This type of incident is particularly unpleasant car manufacturers draw attention to driver of users that they have to switch to the pump as soon as possible after the contents of the tank fuel has dropped below a minimum level which is most often indicated by the lighting of a warning light.

L'invention résulte de la constatation que cette alerte du conducteur à l'aide du seul voyant de niveau minimum est insuffisante pour éviter l'incident de désamorçage de la pompe, lié à la panne sèche. En effet, le conducteur sachant qu'il peut encore rouler sur une distance confortable - par exemple de l'ordre d'une bonne centaine de kilomètres - à partir de l'allumage du voyant de niveau minimum, sa vigilance n'est pas maximale et le relâchement de l'attention peut l'amener à rouler jusqu'à vider le réservoir en carburant.The invention results from the observation that this driver alert using single minimum level indicator is insufficient to avoid the defusing incident of the pump, linked to the breakdown. Indeed, the driver knowing that it can still travel a comfortable distance - by example of the order of a good hundred kilometers - from the minimum level warning light comes on, its vigilance is not not maximum and loosening of attention can cause it to drive until the fuel tank is empty.

Selon l'invention, on prévoit un moyen pour alerter le conducteur du véhicule du risque d'incident quand le niveau du carburant descend au-dessous d'un second niveau, sensiblement inférieur au premier niveau minimum.According to the invention, a means is provided for alerting the driver of the vehicle the risk of incident when the level of the fuel drops below a second level, substantially lower than the first minimum level.

De préférence, l'alerte de risque de désamorçage de la pompe du circuit d'alimentation en carburant ne sera fournie qu'un temps relativement court (ou une distance relativement faible) avant que l'incident risque de se produire réellement, afin que cette seconde alerte intervienne peu souvent. En effet, si la distance restant à parcourir était trop importante après cette seconde alerte, le conducteur risquerait aussi de s'y accoutumer, ce qui relâcherait sa vigilance.Preferably, the risk alert for defusing the fuel system pump will be supplied that a relatively short time (or a relatively short distance low) before the incident is likely to actually happen, so that this second alert occurs infrequently. Indeed, if the distance remaining was too great after this second alert, the driver would also risk going there accustom, which would relax his vigilance.

L'alerte de risque de désamorçage de la pompe d'alimentation peut consister en un signal lumineux ou sonore. Elle peut aussi consister en une commande de diminution des performances du moteur, sa mise en fonctionnement ralenti, ou son arrêt complet. Ces diverses commandes peuvent également intervenir de façon successive : les performances du moteur sont d'abord diminuées, ensuite il est mis au ralenti, et, enfin, arrêté avant que la pompe se désamorce. Quand on prévoit une alerte lumineuse ou sonore, celle-ci peut aussi intervenir avant ou pendant la commande automatique de diminution des performances du moteur. The alert for the risk of the pump priming may consist of a light or sound signal. She may also consist of a command to decrease performance of the engine, its idling, or its complete stop. These various commands can also intervene successively: engine performance is first decreased, then it is idled, and finally stopped before the pump is primed. When we plan a light or sound alert, this can also occur before or during the automatic performance decrease command of the motor.

Il est à noter que l'invention n'est pas limitée à un moteur Diesel pour véhicule automobile. Elle s'applique à toutes les utilisations des moteurs Diesel puisqu'elle permet l'arrêt automatique ou manuel du moteur juste avant que la (ou les) pompe(s) du circuit d'alimentation se remplisse d'air.It should be noted that the invention is not limited to a Diesel engine for motor vehicle. It applies to all the uses of diesel engines since it allows stopping automatic or manual engine just before the (or the) fuel system pump (s) fills with air.

Pour la détection du second niveau minimum de carburant, dans une réalisation particulièrement simple et peu onéreuse, on prévoit un compteur de distance parcourue et/ou de consommation de carburant à partir du premier niveau et l'alerte de risque de désamorçage est déclenchée quand la distance parcourue et/ou la consommation depuis ce premier niveau, atteint une limite déterminée.For the detection of the second minimum fuel level, in a particularly simple and inexpensive embodiment, a distance and / or distance counter is provided fuel consumption from the first level and the alert risk of defusing is triggered when the distance traveled and / or consumption since this first level, reached a specified limit.

Pour la détection du second niveau, dans une autre réalisation, qui peut s'utiliser en combinaison avec la précédente, ou indépendamment de cette dernière, dans le cas où l'on prévoit une régulation de remplissage et/ou de pression de l'alimentation en carburant, on utilise au moins un signal de mesure ou de commande de cette régulation.For the detection of the second level, in another realization, which can be used in combination with the previous one, or independently of the latter, in the case where provides for filling and / or pressure regulation fuel supply, at least one signal is used measurement or control of this regulation.

On a en effet constaté que, dès que la pompe d'alimentation ou de pression commence à se remplir partiellement d'air, le signal d'erreur (l'écart entre une valeur réelle et une valeur de consigne) de la régulation de remplissage ou de pression dépasse une valeur limite et/ou les signaux de commande de la régulation présentent des instabilités.It has in fact been observed that, as soon as the feed pump or pressure begins to partially fill with air, the error signal (the difference between a real value and a value filling or pressure regulation) exceeds a limit value and / or the control signals of the regulation have instabilities.

Ce dernier type de détection est, de préférence, utilisé afin de déclencher la diminution des performances, le ralenti ou l'arrêt du moteur. En effet, quand un signal de mesure ou de commande de la régulation commence à s'écarter de sa valeur habituelle, cet écart indique la proximité immédiate de la zone à risque réel de désamorçage. Autrement dit, la commande du moyen permettant d'éviter le désamorçage de la pompe est effectuée seulement lorsque le risque est imminent. Ainsi avec un conducteur normalement attentif et précautionneux, cette commande interviendra très rarement, ce qui attirera d'autant plus son attention lorsqu'elle se produit. The latter type of detection is preferably used in order to trigger the performance decrease, the engine idling or stopping. When a signal from measurement or control regulation starts to deviate from its usual value, this difference indicates immediate proximity of the area at real risk of defusing. In other words, the command means to avoid defusing the pump is performed only when the risk is imminent. So with a normally attentive and careful driver, this order will occur very rarely, which will attract all the more attention when it occurs.

Quand le moteur est du type à rampe commune (ou "common rail"), pour la détection du second niveau on fait, de préférence, appel à un signal de mesure de la régulation de remplissage et/ou de pression dans la rampe commune.When the engine is of the common rail type (or "common rail"), for the detection of the second level we do, preferably use a filling regulation measurement signal and / or pressure in the common rail.

On rappelle qu'un moteur Diesel à rampe commune comporte un conduit dans lequel le carburant arrive sous haute pression, des électrovannes reliant ce conduit à chacun des cylindres, et des moyens de commande de ces électrovannes permettent de fournir à chacun des cylindres la quantité optimale de carburant à l'instant optimal et avec une pression optimale.Remember that a common rail diesel engine has a conduit in which the fuel arrives under high pressure, solenoid valves connecting this conduit to each of cylinders, and means for controlling these solenoid valves allow provide each cylinder with the optimum amount of fuel at the optimal time and with optimal pressure.

Quel que soit le mode de réalisation de l'invention, afin de ne pas risquer d'alerte intempestive, il est préférable que les moyens de détection du second niveau soient mis en fonctionnement seulement après détection du premier niveau.Whatever the embodiment of the invention, in order not to risk an untimely alert, it is preferable that the second level detection means are put into operation only after detection of the first level.

L'invention concerne ainsi un dispositif d'alerte de la proximité d'un incident dans un véhicule à moteur Diesel, qui est caractérisé en ce que l'incident étant le risque de désamorçage d'au moins une pompe d'alimentation en carburant, il comprend un moyen pour détecter que le niveau de carburant est descendu au-dessous d'un second niveau, sensiblement inférieur au premier niveau minimum à partir duquel est déclenchée une alarme conseillant le remplissage de ce réservoir.The invention thus relates to a device for alerting the proximity of an incident in a diesel engine vehicle, which is characterized in that the incident being the risk of defusing at least one fuel supply pump, it comprises means for detecting that the fuel level has gone down below a second level, significantly lower than first minimum level from which an alarm is triggered advising the filling of this tank.

Un moyen est par exemple prévu pour réduire les performances du moteur, ce moyen étant déclenché par le moyen de détection.A means is, for example, provided for reducing performance of the engine, this means being triggered by the means of detection.

Dans une réalisation, on prévoit un moyen pour imposer un régime de ralenti au moteur quand le moyen de détection indique la proximité de l'incident.In one embodiment, a means is provided for imposing engine idling speed when the detection means indicates the proximity of the incident.

On peut aussi prévoir un moyen pour interrompre l'alimentation en carburant quand le moyen de détection indique la proximité de l'incident.One can also provide a means to interrupt the feeding. in fuel when the detection means indicate the proximity to the incident.

Selon une réalisation, le moyen de détection comprend un moyen pour détecter la distance parcourue à partir de la détection du premier niveau minimum en carburant et un moyen pour comparer cette distance à une limite prédéterminée. According to one embodiment, the detection means comprises means for detecting the distance traveled from the detection of the first minimum fuel level and a means to compare this distance to a predetermined limit.

Dans une variante, on prévoit un moyen pour déterminer la consommation en carburant à partir de la détection du premier niveau minimum de carburant et un moyen pour comparer cette consommation à une limite prédéterminée.Alternatively, a means is provided for determining fuel consumption from the detection of the first minimum fuel level and a way to compare this consumption at a predetermined limit.

Dans une réalisation, le moteur comporte un régulateur de remplissage en carburant et le moyen de détection comprend un moyen pour surveiller un paramètre du régulateur de remplissage.In one embodiment, the motor includes a regulator filling with fuel and the detection means comprises a means for monitoring a parameter of the filling regulator.

Le paramètre du régulateur de remplissage est par exemple le signal d'erreur, des moyens étant prévus pour comparer ce signal d'erreur à une limite prédéterminée.The parameter of the filling regulator is by example the error signal, means being provided for comparing this error signal to a predetermined limit.

Dans un mode de réalisation, le moteur comporte un régulateur de pression du carburant et le moyen de détection comprend un moyen pour surveiller un paramètre de ce régulateur de pression.In one embodiment, the engine includes a fuel pressure regulator and detection means includes means for monitoring a parameter of this regulator pressure.

Le paramètre du régulateur de pression est par exemple le signal d'erreur, un moyen étant prévu pour comparer ce signal d'erreur à une limite prédéterminée.The parameter of the pressure regulator is for example the error signal, a means being provided for comparing this signal error at a predetermined limit.

Le paramètre du régulateur de pression peut être le degré de stabilité de la pression ou du courant de commande du régulateur de pression.The parameter of the pressure regulator can be the degree of pressure or current control stability of the pressure regulator.

Quand le moteur Diesel est du type à rampe commune, le moyen de détection peut être un moyen pour surveiller la pression dans la rampe commune.When the diesel engine is of the common rail type, the sensing means can be a means to monitor the pressure in the common rail.

L'invention concerne aussi un dispositif d'alerte de la proximité d'un incident d'alimentation d'un moteur Diesel à pompe d'alimentation, qui caractérisé en ce que l'incident étant le risque de désamorçage d'au moins une pompe d'alimentation en carburant, et le moteur comportant un régulateur de remplissage ou de pression du carburant, il comprend un moyen pour détecter une valeur anormale d'un paramètre de la régulation.The invention also relates to a device for alerting the proximity of a diesel engine power supply incident to feed pump, which characterized in that the incident being the risk of defusing at least one feed pump fuel, and the engine comprising a filling regulator or fuel pressure, it includes means for detecting an abnormal value of a regulation parameter.

D'autres caractéristiques et avantages de l'invention apparaítront avec la description de certains de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels :

  • la figure 1 est un schéma simplifié d'un moteur Diesel du type à rampe commune, et
  • la figure 2 est un organigramme montrant le fonctionnement d'un dispositif conforme à l'invention.
    • Other characteristics and advantages of the invention will appear with the description of some of its embodiments, this being carried out with reference to the attached drawings in which:
  • FIG. 1 is a simplified diagram of a diesel engine of the common rail type, and
  • Figure 2 is a flowchart showing the operation of a device according to the invention.

    • Un moteur Diesel comporte une pompe 10 pour l'alimentation en carburant 14 (figure 1) d'une pompe haute pression 16. La pompe d'alimentation 10 est, dans l'exemple, disposée dans un réservoir 12. En variante (non montrée), la pompe 10 est disposée dans le conduit 18 reliant le réservoir à la pompe 16. Dans une autre variante (également non montrée), elle est intégrée à la pompe haute pression 16.A diesel engine has a pump 10 for the fuel supply 14 (FIG. 1) of a high pump pressure 16. The feed pump 10 is, in the example, disposed in a reservoir 12. As a variant (not shown), the pump 10 is arranged in the conduit 18 connecting the reservoir to the pump 16. In another variant (also not shown), it is integrated into the high pressure pump 16.

    La pompe d'injection 16 est destinée à mettre le carburant sous une pression élevée de l'ordre de 200 à 1 500 bars, suivant le point de fonctionnement du moteur. Elle alimente un conduit 22 destiné à l'injection du carburant sous pression dans chacun des cylindres du moteur par l'intermédiaire d'électrovannes 241, 242, etc.The injection pump 16 is intended to put the fuel under a high pressure of the order of 200 to 1500 bars, depending on the operating point of the engine. It feeds a line 22 intended for injecting pressurized fuel into each of the engine cylinders by means of solenoid valves 24 1 , 24 2 , etc.

    Un calculateur ou organe central de commande 30 est prévu pour commander, d'une part, un régulateur de remplissage 20 en amont de la pompe 16, et, d'autre part, un régulateur de pression 17 de la pompe d'injection 16 ainsi que l'instant d'ouverture des électrovannes 241, 242, etc.A computer or central control member 30 is provided for controlling, on the one hand, a filling regulator 20 upstream of the pump 16, and, on the other hand, a pressure regulator 17 of the injection pump 16 thus that the instant of opening of the solenoid valves 24 1 , 24 2 , etc.

    Le calculateur 30 remplit aussi les fonctions habituelles d'un calculateur de véhicule automobile, c'est-à-dire qu'il totalise la distance parcourue et la consommation et il commande la régulation de remplissage et/ou la régulation de pression. À cet effet, le calculateur 30 reçoit un signal de mesure d'un capteur 23 de pression dans la rampe commune 22 et contrôle les signaux de commande de la régulation de remplissage et/ou de la régulation de pression 17.The computer 30 also performs the usual functions a motor vehicle control unit, i.e. that it totals the distance traveled and the consumption and it controls the filling regulation and / or the regulation of pressure. To this end, the computer 30 receives a signal measurement of a pressure sensor 23 in the common rail 22 and checks the control signals of the filling regulation and / or pressure regulation 17.

    Ces divers organes sont mis à profit, conformément à l'invention, pour signaler au conducteur du véhicule automobile que son réservoir est pratiquement vide et qu'il est très proche de la panne sèche. En outre, des dispositions sont prises pour diminuer les performances du moteur, puis le mettre en ralenti, puis, enfin, le mettre à l'arrêt juste avant que puisse intervenir la panne sèche et donc le désamorçage des pompes 10 et 16.These various organs are used, in accordance with the invention, to signal to the driver of the motor vehicle that its tank is practically empty and that it is very close of the blackout. In addition, arrangements are made to reduce engine performance, then put it to idle, then, finally, put it to a stop just before it can intervene the dry breakdown and therefore the defusing of pumps 10 and 16.

    À cet effet, le calculateur 30 effectue une commande selon le diagramme de la figure 2.To this end, the computer 30 performs a command according to the diagram in Figure 2.

    Pour éviter des alertes ou commandes intempestives, la fonction d'alarme ou commande n'est mise en route qu'à partir du moment où le niveau du carburant 14 descend au-dessous d'un premier niveau qui, de façon la plus simple, est le niveau habituel d'alerte de niveau minimum, soit, par exemple, environ 10 % du contenu du réservoir 12.To avoid nuisance alerts or commands, the alarm or control function is only activated from when fuel level 14 drops below one first level which, in the simplest way, is the usual level minimum level alert, i.e. about 10% of the contents of the reservoir 12.

    Cette étape est représentée par le bloc 32 sur la figure 2. À partir de cette étape 32, le calculateur 30 détermine la distance parcourue (bloc 34) et la consommation en carburant (bloc 36).This step is represented by block 32 on the Figure 2. From this step 32, the computer 30 determines distance traveled (block 34) and fuel consumption (block 36).

    La distance parcourue est comparée à une limite prédéterminée Dr(bloc 38). Si cette distance parcourue dépasse la limite Dr, les performances du moteur sont réduites (bloc 40). Par exemple, des moyens sont prévus pour réduire la vitesse maximale et/ou limiter la vitesse de rotation du moteur et/ou limiter l'alimentation en carburant.The distance traveled is compared to a predetermined limit D r (block 38). If this distance traveled exceeds the limit D r , the performance of the motor is reduced (block 40). For example, means are provided for reducing the maximum speed and / or limiting the speed of rotation of the engine and / or limiting the fuel supply.

    De même, la consommation en carburant est comparée à une limite prédéterminée Vr (bloc 42) et si la consommation dépasse la limite Vr, les performances du moteur sont également réduites.Likewise, the fuel consumption is compared with a predetermined limit V r (block 42) and if the consumption exceeds the limit V r , the engine performance is also reduced.

    Dans l'exemple, le calculateur 30 surveille (blocs 39 et 43) aussi le régulateur de remplissage 20 et/ou de pression 17 et indique si la régulation présente des dérives (blocs 44 et 46). Les performances du moteur sont réduites (bloc 40) quand de telles dérives interviennent.In the example, the computer 30 monitors (blocks 39 and 43) also the filling and / or pressure regulator 20 17 and indicates whether the regulation exhibits drifts (blocks 44 and 46). Engine performance is reduced (block 40) when such drifts occur.

    Pour surveiller les dérives de régulation de remplissage et/ou de pression, on mesure le signal d'erreur, c'est-à-dire l'écart entre la valeur réelle et la valeur désirée (la consigne). Si cet écart dépasse une limite déterminée, cet écart est indicateur de l'approche de la panne sèche et donc du désamorçage de la pompe 10 ou 16. L'écart de pression est mesuré grâce au capteur 23 de pression dans le conduit 22.To monitor filling regulation drifts and / or pressure, the error signal is measured, i.e. the difference between the actual value and the desired value (the instructions). If this deviation exceeds a determined limit, this deviation is an indicator of the approach to the dry breakdown and therefore to defusing of pump 10 or 16. The pressure difference is measured thanks to the pressure sensor 23 in the duct 22.

    Comme le montre la figure 2, en cas de dérives de régulation du remplissage et/ou de la pression de carburant, les performances du moteur sont réduites même si depuis que le premier niveau minimum ait été atteint, la distance parcourue, ou le carburant consommé ne dépasse pas la limite Dr ou Vr. Toutefois, pour empêcher les alertes intempestives, la surveillance de ces dérives ne démarre qu'après apparition du message du bloc 32.As shown in Figure 2, in the event of fuel drifts and / or fuel pressure regulation, the engine performance is reduced even if since the first minimum level has been reached, the distance traveled, or the fuel consumed does not exceed the limit D r or V r . However, to prevent nuisance alerts, monitoring of these drifts does not start until the message from block 32 appears.

    Le calculateur 30 surveille (bloc 48) également au moins un paramètre du régulateur 17 de pression de la pompe 16. Par exemple, si la pression dans ce régulateur 17 ne peut atteindre la valeur de consigne, c'est-à-dire si l'écart entre la pression réelle et la pression de consigne est supérieur à une valeur prédéterminée, cette situation indique également, et de façon sûre, l'approche de la panne sèche, c'est-à-dire que la pompe 10 ou 16 commence à aspirer de l'air en même temps que du carburant. En outre, dans cette situation, la régulation présente des instabilités, le signal d'erreur subissant de fortes oscillations. Ces instabilités fournissent aussi de façon certaine l'information que les pompes 10 et 16 sont sur le point de se désamorcer.The computer 30 monitors (block 48) also at minus one parameter of the pump pressure regulator 17. For example, if the pressure in this regulator 17 cannot reach the setpoint, i.e. if the difference between the actual pressure and the set pressure is greater than a predetermined value, this situation also indicates, and safely, the approach of the blackout, that is to say that the pump 10 or 16 starts sucking in air at the same time as fuel. Furthermore, in this situation, the regulation presents instabilities, the error signal undergoing strong oscillations. These instabilities also certainly provide the information that pumps 10 and 16 are about to defuse.

    Dans ces conditions, si la pression dans la pompe 16 (Prail) ne peut atteindre la consigne et si la régulation présente des instabilités (bloc 50), pour éviter le désamorçage, le moteur est mis au ralenti et, ensuite, l'injection en carburant est interrompue (bloc 52).Under these conditions, if the pressure in the pump 16 (Prail) cannot reach the setpoint and if the regulation presents instabilities (block 50), to avoid defusing, the engine is idling and then fuel injection is interrupted (block 52).

    Les paramètres Dr et Vr dépendent de chaque véhicule. Ils sont déterminés par des essais. Ces paramètres ont, dans un exemple, pour valeurs approximatives : Dr = 80 km et Vr = 4 litres.The parameters D r and V r depend on each vehicle. They are determined by tests. These parameters have, in an example, approximate values: D r = 80 km and V r = 4 liters.

    Dans une réalisation, avant la réduction des performances du moteur, ou en même temps, on prévoit une alarme lumineuse au tableau de bord du véhicule ou une alarme sonore qui indique au conducteur qu'il se trouve à proximité du désamorçage de la pompe 10 ou 16.In one embodiment, before the performance reduction of the engine, or at the same time, a light alarm is provided on the vehicle dashboard or an audible alarm which indicates to the driver that he is near the defusing pump 10 or 16.

    L'invention consiste donc à alerter (par une alarme ou une action sur le moteur) le conducteur (ou, de façon plus générale, l'utilisateur d'un moteur Diesel) du risque d'incident quand le niveau de carburant descend au-dessous d'un second niveau, sensiblement inférieur au premier niveau minimum indiqué par le bloc 32. Ce second niveau peut être détecté par divers moyens. La détection directe du second niveau ou la totalisation de consommation (blocs 36 et 42) ne sont pas indispensables pour cette détection. En effet, chacun des divers autres paramètres telles que la distance parcourue (blocs 34 et 38), la mesure des dérives de régulation de remplissage (blocs 44 et 46), ainsi que les mesures d'instabilités ou dérives dans le régulateur de pression 17 (bloc 48) constituent chacun, en eux-mêmes, des indicateurs du fait que le niveau du réservoir est descendu au-dessous du second niveau.The invention therefore consists in alerting (by an alarm or an action on the engine) the driver (or, more generally, the user of a Diesel engine) of the risk of incident when the fuel level drops below a second level, significantly lower than the first minimum level indicated by block 32. This second level can be detected by various means. Direct detection of the second level or totalization consumption (blocks 36 and 42) are not essential for this detection. Indeed, each of the various other parameters such as distance traveled (blocks 34 and 38), measurement of filling regulation drifts (blocks 44 and 46), as well as instability or drift measurements in the pressure 17 (block 48) each constitute, in themselves, indicators the fact that the tank level has dropped below second level.

    Claims (13)

    Dispositif d'alerte de la proximité d'un incident dans un véhicule à moteur Diesel, caractérisé en ce que l'incident étant le risque de désamorçage d'au moins une pompe (10 ; 16) d'alimentation en carburant, il comprend un moyen (34 ; 36 ; 48) pour détecter que le niveau de carburant est descendu au-dessous d'un second niveau, sensiblement inférieur au premier niveau minimum à partir duquel est déclenchée une alarme (32) conseillant le remplissage de ce réservoir.Device for alerting the proximity of an incident in a diesel engine vehicle, characterized in that the incident being the risk of defusing at least one fuel supply pump (10; 16), it comprises a means (34; 36; 48) for detecting that the fuel level has dropped below a second level, substantially lower than the first minimum level from which an alarm (32) is triggered advising the filling of this tank. Dispositif selon la revendication 1, caractérisé en ce qu'il comporte un moyen (40) pour réduire les performances du moteur qui est déclenché par le moyen de détection.Device according to claim 1, characterized in that it comprises means (40) for reducing the performance of the motor which is triggered by the detection means. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'il comprend un moyen (52) pour imposer un régime de ralenti au moteur quand le moyen de détection indique la proximité de l'incident.Device according to claim 1 or 2, characterized in that it comprises means (52) for imposing an idling speed on the engine when the detection means indicates the proximity of the incident. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comporte un moyen (52) pour interrompre l'alimentation en carburant quand le moyen de détection indique la proximité de l'incident.Device according to any one of Claims 1 to 3, characterized in that it includes means (52) for interrupting the supply of fuel when the detection means indicates the proximity of the incident. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte une alarme lumineuse ou sonore, commandée par le moyen de détection, informant le conducteur de la proximité de l'incident.Device according to any one of the preceding claims, characterized in that it includes a light or sound alarm, controlled by the detection means, informing the driver of the proximity of the incident. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le moyen de détection comprend un moyen (34) pour détecter la distance parcourue à partir de la détection du premier niveau minimum en carburant et un moyen (38) pour comparer cette distance à une limite (Dr) prédéterminée.Device according to any one of the preceding claims, characterized in that the detection means comprises means (34) for detecting the distance traveled from the detection of the first minimum fuel level and means (38) for comparing this distance to a predetermined limit (D r ). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un moyen (36) pour déterminer la consommation en carburant à partir de la détection du premier niveau minimum de carburant et un moyen (42) pour comparer cette consommation à une limite (Vr) prédéterminée.Device according to any one of the preceding claims, characterized in that it includes means (36) for determining the fuel consumption from the detection of the first minimum fuel level and means (42) for comparing this consumption with a predetermined limit (V r ). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur comportant un régulateur (20) de remplissage en carburant, le moyen de détection comprend un moyen (39 ; 43) pour surveiller un paramètre du régulateur de remplissage.Device according to any one of the preceding claims, characterized in that the engine comprising a fuel filling regulator (20), the detection means comprises means (39; 43) for monitoring a parameter of the filling regulator. Dispositif selon la revendication 8, caractérisé en ce que le paramètre du régulateur de remplissage est le signal d'erreur, des moyens (30) étant prévus pour comparer ce signal d'erreur à une limite prédéterminée.Device according to claim 8, characterized in that the parameter of the filling regulator is the error signal, means (30) being provided for comparing this error signal with a predetermined limit. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur comportant un régulateur de pression (17) du carburant, le moyen de détection comprend un moyen (48) pour surveiller un paramètre de ce régulateur de pression.Device according to any one of the preceding claims, characterized in that the engine comprising a fuel pressure regulator (17), the detection means comprises means (48) for monitoring a parameter of this pressure regulator. Dispositif selon la revendication 10, caractérisé en ce que le paramètre du régulateur de pression est le signal d'erreur, un moyen étant prévu pour comparer ce signal d'erreur à une limite prédéterminée.Device according to claim 10, characterized in that the parameter of the pressure regulator is the error signal, means being provided for comparing this error signal with a predetermined limit. Dispositif selon la revendication 10 ou 11, caractérisé en ce que le paramètre du régulateur de pression est le degré de stabilité de la pression ou du courant de commande du régulateur de pression.Device according to claim 10 or 11, characterized in that the parameter of the pressure regulator is the degree of stability of the pressure or of the control current of the pressure regulator. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur Diesel étant du type à rampe commune, le moyen de détection comprend un moyen (23 ; 39 ; 43) pour surveiller la pression dans la rampe commune (22).Device according to any one of the preceding claims, characterized in that the diesel engine being of the common rail type, the detection means comprises means (23; 39; 43) for monitoring the pressure in the common rail (22).
    EP01400675A 2000-04-13 2001-03-14 Alarm and/or control device for diesel engines, especially for automotive vehicles Expired - Lifetime EP1146221B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0004761A FR2807790B1 (en) 2000-04-13 2000-04-13 ALARM AND / OR CONTROL DEVICE FOR A DIESEL ENGINE, PARTICULARLY FOR A MOTOR VEHICLE
    FR0004761 2000-04-13

    Publications (2)

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    EP1146221A1 true EP1146221A1 (en) 2001-10-17
    EP1146221B1 EP1146221B1 (en) 2005-08-31

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    EP (1) EP1146221B1 (en)
    AT (1) ATE303509T1 (en)
    DE (1) DE60112984T2 (en)
    ES (1) ES2248249T3 (en)
    FR (1) FR2807790B1 (en)

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    Publication number Priority date Publication date Assignee Title
    EP2149693A1 (en) * 2008-08-01 2010-02-03 International Engine Intellectual Property Company, LLC. High pressure oil limit based on fuel level to protect fuel injectors
    USRE42771E1 (en) * 2001-12-14 2011-10-04 Fev Motorentechnik Gmbh Method of operation of a device for energy conversion using a main fuel and at least one auxiliary fuel

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    US4124013A (en) * 1977-06-29 1978-11-07 Rivalto Michael A Fuel level responsive means
    GB2140091A (en) * 1983-05-17 1984-11-21 Petter Refrigeration Ltd Fuel supply system for a diesel engine
    US4960088A (en) * 1989-09-08 1990-10-02 Thermo King Corporation Low fuel shut-off system
    US5095880A (en) * 1991-08-22 1992-03-17 Ricks Robert C Air purging and shut-down system for diesel engines

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    Publication number Priority date Publication date Assignee Title
    US4124013A (en) * 1977-06-29 1978-11-07 Rivalto Michael A Fuel level responsive means
    GB2140091A (en) * 1983-05-17 1984-11-21 Petter Refrigeration Ltd Fuel supply system for a diesel engine
    US4960088A (en) * 1989-09-08 1990-10-02 Thermo King Corporation Low fuel shut-off system
    US5095880A (en) * 1991-08-22 1992-03-17 Ricks Robert C Air purging and shut-down system for diesel engines

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    USRE42771E1 (en) * 2001-12-14 2011-10-04 Fev Motorentechnik Gmbh Method of operation of a device for energy conversion using a main fuel and at least one auxiliary fuel
    EP2149693A1 (en) * 2008-08-01 2010-02-03 International Engine Intellectual Property Company, LLC. High pressure oil limit based on fuel level to protect fuel injectors
    CN101705878B (en) * 2008-08-01 2013-05-08 万国引擎知识产权有限责任公司 High pressure oil limit based on fuel level to protect fuel injectors

    Also Published As

    Publication number Publication date
    FR2807790B1 (en) 2002-10-11
    EP1146221B1 (en) 2005-08-31
    DE60112984T2 (en) 2006-06-22
    ATE303509T1 (en) 2005-09-15
    DE60112984D1 (en) 2005-10-06
    ES2248249T3 (en) 2006-03-16
    FR2807790A1 (en) 2001-10-19

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