EP0127495A1 - Servo-control system for the speed of a diesel engine by electronically regulating the fuel delivery - Google Patents

Servo-control system for the speed of a diesel engine by electronically regulating the fuel delivery Download PDF

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Publication number
EP0127495A1
EP0127495A1 EP84400786A EP84400786A EP0127495A1 EP 0127495 A1 EP0127495 A1 EP 0127495A1 EP 84400786 A EP84400786 A EP 84400786A EP 84400786 A EP84400786 A EP 84400786A EP 0127495 A1 EP0127495 A1 EP 0127495A1
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EP
European Patent Office
Prior art keywords
digital
engine speed
signal
speed
metering valve
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP84400786A
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German (de)
French (fr)
Inventor
Yves Drutel
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.)
Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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Publication of EP0127495A1 publication Critical patent/EP0127495A1/en
Withdrawn legal-status Critical Current

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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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque

Definitions

  • Device for controlling the speed of a diesel engine by electronic regulation of the flow of fuel injected by the injection pump is a device for controlling the speed of a diesel engine by electronic regulation of the flow of fuel injected by the injection pump.
  • the invention relates to the regulation of injection pumps for diesel engines, in particular rotary pumps comprising a metering valve whose position determines the injected flow rate.
  • these pumps include a mechanical regulator, constituted by centrifugal weights mounted on the axis of the pump and which act on a tilting control pallet to exert a force as a function of speed, this pallet being moreover provided with a spring. booster whose voltage is controlled by the control handle.
  • this pallet controls the metering valve in a unilateral connection in the direction required for regulation. As a result, an increase in speed produces a gradual closing of the valve, and vice versa, until reaching an equilibrium point, this equilibrium point being moreover displaceable by action on the control lever.
  • This mechanical regulation is therefore of the proportional type.
  • a hydraulic regulator is also used with this type of pump, which has practically the same disadvantages as the regulator. mechanical.
  • the actuator for controlling the flow rate of the pump does not receive a set value but a variation value, this variation in the flow rate of the pump resulting in feedback a variation in the speed of the motor, and therefore regulation via the general regulation loop, that is to say according to a relatively slow process.
  • the object of the present invention is to provide a regulation device whose speed of response and precision advantageously complement the precision of regulation of the proportional, integral and derivative type used in the devices of the patents cited above.
  • said servomotor is an electric servomotor
  • the valve setpoint signal (CS) supplied by the regulator to the servomotor is constituted by a current chopped variable duty cycle, and that this actuator has a position control loop with analog control of the valve opening angle.
  • a mechanical shaft integral in rotation with the shaft of the pump or of the motor, and comprising any toothed wheel, not shown, rotating opposite an electromagnetic sensor 2, the signals of which are taken up by a counter 3 which formats them and counts the pulses produced during successive time periods, which are themselves supplied by a time base integrated into the counter.
  • a digital signal RM representative of the engine speed is thus obtained at the output of the counter.
  • the control handle supplies at 4 an analog signal which is transformed by an analog / digital converter 5 into a digital signal RC representative of the set value of the engine speed.
  • an analog / digital converter 5 into a digital signal RC representative of the set value of the engine speed.
  • the control handle could directly supply a digital setpoint value.
  • the two digital values RC and RM are compared in a digital comparator 6 which performs their difference in order to develop an error signal SE which constitutes the input signal of an electronic regulator 7.
  • This regulator notably comprises a microprocessor and the memory registers as well as the programming instructions to be able to process this error signal SE in order to develop by numerical calculation the terms respectively proportional, integral, and derivative according to the general theory of the regulation. These terms, multiplied by respective constants determined experimentally, are combined to provide the digital reference signal for the position of the valve CS.
  • This valve setpoint signal CS is sent to a servomotor 8 which controls the metering valve 10 by a shaft 9, which regulates the flow rate sent by 11 to the pump and to the motor 12.
  • This servomotor includes an angular position detector. the shaft 9, therefore of the valve 10, which provides a digital signal AS representative of this opening angle to a comparator integrated into the servomotor and which compares the valve opening angle AS with the valve setpoint CS to determine a error signal and consequently rotate the servomotor 8 in the desired direction to cancel the deviation.
  • this servomotor can be constituted by a servomotor of the current type in model making and which is generally controlled by a signal CS chopped current input whose duty cycle represents the setpoint in analog form, the angular determination AS being itself operated in this case by analog means.
  • an appropriate reduction gear 13 for a maximum angular clearance of approximately 90 ° used for the control of a reduced model.
  • the rotary control of the metering valve la by the shaft 9 is not a direct control but has a one-sided connection to allow superimposition of a control in the direction of closing the metering valve 10 under the effect of a stop bar 14 of the usual type.
  • the control lever 15 integral with the metering valve 10 has an end pin 16 of the usual type, which is joined at the end 17 of an actuating lever 18 disposed in the housing 19.
  • This lever 18 is integral with the inner end of a shaft 20 coupled by a coupling 21 to the shaft 9 exiting the gearmotor, the connection between 16 and 17 being provided by a standard linkage 22, with unilateral actuation and play take-up spring 23 , of the type used in the mechanical regulation device mentioned above to connect this same control lever 15 to the pallet of the mechanical regulator, which is obviously absent in the case of the invention, as well as the regulation spring, the counterweights centrifuges and associated control parts.
  • the invention it is possible to determine experimentally the constants of the proportional, integral and derived elements of the regulator 7 so that the regulation has the desired characteristics, in particular a good speed of response combined with a stability of the regime vis-à-vis disturbances in the resisting torque, these qualities being particularly appreciable for application to agricultural tractors.
  • the invention also makes it possible to easily produce a speed limiter by simply programming the governor 7 while avoiding the addition of the usual limiting actuator.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The system for the electronic control of a diesel engine injection pump incorporates a metering valve (10) regulating the fuel delivery. The system also includes in combination a digital detector (2, 3) of the speed of the engine or the pump, which generates a digital signal (RM) representative of the engine speed; a digital detector (4, 5) of the position of the throttle controlling the engine speed, which supplies a digital signal (RC) representative of the reference value of the engine speed; a digital comparator (6), which calculates a digital error signal (SE) as the difference between the two previous signals (SE = RC - RM); a PID (proportional integral and derivative) digital controller (7) for calculating a reference signal (CS) for the metering valve (10) from the aforesaid error signal (SE), with the help of a microprocessor, internal memories and programs; and a servo- motor (8, 9) incorporating its own feedback loop for positioning the metering valve in a position corresponding to the aforesaid reference signal (CS). <IMAGE>

Description

Dispositif d'asservissement du régime d'un moteur Diesel par régulation électronique du débit du carburant injecté par la pompe à injection.Device for controlling the speed of a diesel engine by electronic regulation of the flow of fuel injected by the injection pump.

L'invention concerne la régulation des pompes à injection pour moteurs Diesel, notamment des pompes rotatives comportant une soupape de dosage dont la position détermine le débit injecté.The invention relates to the regulation of injection pumps for diesel engines, in particular rotary pumps comprising a metering valve whose position determines the injected flow rate.

A titre d'exemple caractéristique on considérera la pompe "ROTO DIESEL" à distributeur rotatif D.P.A.As a typical example, consider the "ROTO DIESEL" pump with a rotary distributor D.P.A.

De telles pompes, entrainées par le moteur Diesel, nécessitent une régulation pour assurer un fonctionnement stable lorsque la manette de commande de vitesse est en position fixe.Such pumps, driven by the Diesel engine, require regulation to ensure stable operation when the speed control lever is in the fixed position.

Habituellement, ces pompes comportent un régulateur mécanique, constitué par des masselottes centrifuges montées sur l'axe de la pompe et qui agissent sur une palette basculante de commande pour exercer un effort fonction de la vitesse, cette palette étant par ailleurs munie d'un ressort de rappel dont la tension est commandée par la manette de commande. En outre, cette palette commande par une liaison unilatérale la soupape de dosage dans le sens voulu pour la régulation. Il en résulte qu'une augmentation de vitesse produit une fermeture progressive de la soupape, et inversement, jusqu'à aboutir à un point d'équilibre, ce point d'équilibre étant par ailleurs déplaçable par action sur la manette de commande. Cette régulation mécanique est donc du type proportionnel. Il est par suite nécessaire qu'il existe une erreur entre la consigne, qui est la position de la manette d'accélération, et la vitesse du moteur transmise par les masselottes pour corriger la position de la soupape de dosage. Plus l'erreur est grande et plus la correction est importante. Pour une consigne donnée, l'opérateur obtient donc différentes valeurs du régime moteur selon la valeur du couple résistant imposé au moteur.Usually, these pumps include a mechanical regulator, constituted by centrifugal weights mounted on the axis of the pump and which act on a tilting control pallet to exert a force as a function of speed, this pallet being moreover provided with a spring. booster whose voltage is controlled by the control handle. In addition, this pallet controls the metering valve in a unilateral connection in the direction required for regulation. As a result, an increase in speed produces a gradual closing of the valve, and vice versa, until reaching an equilibrium point, this equilibrium point being moreover displaceable by action on the control lever. This mechanical regulation is therefore of the proportional type. It is therefore necessary that there is an error between the setpoint, which is the position of the throttle, and the speed of the engine transmitted by the weights to correct the position of the metering valve. The larger the error, the greater the correction. For a given setpoint, the operator therefore obtains different values of the engine speed according to the value of the resistive torque imposed on the engine.

On utilise aussi avec ce type de pompe un régulateur hydraulique qui présente pratiquement les mêmes inconvénients que le régulateur mécanique.A hydraulic regulator is also used with this type of pump, which has practically the same disadvantages as the regulator. mechanical.

On connait par ailleurs, d'après les brevets GB-A 2.078.400 et US-A 3.777.174 un dispositif de régulation électronique d'une pompe à injection d'un moteur Diesel de véhicule dans laquelle une soupape de dosage règle le débit de combustible, ce dispositif comportant :

  • - un détecteur numérique du régime du moteur ou de la pompe engendrant un signal numérique (RM) représentatif du régime moteur,
  • - un détecteur numérique de la position de la manette de commande du régime moteur fournissant un signal numérique (RC) représentatif de la valeur de consigne du régime moteur,
  • - un comparateur numérique élaborant un signal numérique d'erreur (SE) comme différence entre les deux signaux précédents (SE =RC - RM),
  • - un régulateur numérique de type proportionnel, intégral et dérivé élaborant, à l'aide d'un microprocesseur, de mémoires internes et de programmes, et à partir du signal d'erreur précédent (SE), un signal (CS) de consigne de la soupape de dosage, et
  • - un servomoteur pour positionner la soupape de dosage dans une position correspondant à la valeur de consigne (CS) précédente.
We also know from GB-A 2,078,400 and US-A 3,777,174 an electronic control device for an injection pump of a vehicle diesel engine in which a metering valve regulates the flow of fuel, this device comprising:
  • - a digital engine speed or pump detector generating a digital signal (RM) representative of the engine speed,
  • - a digital detector of the position of the engine speed control lever providing a digital signal (RC) representative of the engine speed setpoint,
  • - a digital comparator producing a digital error signal (SE) as the difference between the two previous signals (SE = RC - RM),
  • - a digital regulator of the proportional, integral and derivative type developing, using a microprocessor, internal memories and programs, and from the previous error signal (SE), a signal (CS) of setpoint of the metering valve, and
  • - a servomotor to position the metering valve in a position corresponding to the previous setpoint (CS).

Toutefois, dans un dispositif de ce type, l'actionneur de commande du débit de la pompe ne reçoit pas une valeur de consigne mais une valeur de variation, cette variation du débit de la pompe entraînant par rétroaction une variation de la vitesse du moteur, et par conséquent une régulation par l'intermédiaire de la boucle de régulation générale, c'est-à-dire selon un processus relativement lent.However, in a device of this type, the actuator for controlling the flow rate of the pump does not receive a set value but a variation value, this variation in the flow rate of the pump resulting in feedback a variation in the speed of the motor, and therefore regulation via the general regulation loop, that is to say according to a relatively slow process.

La présente invention a pour but de fournir un dispositif de régulation dont la rapidité de réponse et la précision complètent avantageusement la précision de la régulation du type proportionnel, intégral et dérivé utilisée dans les dispositifs des brevets cités ci- dessus.The object of the present invention is to provide a regulation device whose speed of response and precision advantageously complement the precision of regulation of the proportional, integral and derivative type used in the devices of the patents cited above.

A cet effet, elle a pour objet un dispositif de régulation électronique du type précité, caractérisé par le fait que ledit servomoteur est un servomoteur électrique, que le signal de consigne de soupape (CS) fourni par le régulateur au servomoteur est constitué par un courant haché de rapport cyclique variable, et que ce servomoteur comporte une boucle d'asservissement de position avec un contrôle analogique de l'angle d'ouverture de la soupape.To this end, it relates to an electronic regulation device of the aforementioned type, characterized in that said servomotor is an electric servomotor, that the valve setpoint signal (CS) supplied by the regulator to the servomotor is constituted by a current chopped variable duty cycle, and that this actuator has a position control loop with analog control of the valve opening angle.

D'autres particularités de l'invention apparaîtront dans la description qui va suivre d'un mode de réalisation pris comme exemple et représenté sur le dessin annexé, sur lequel :

  • - la figure 1 est une coupe partielle en élévation selon I-I de la figure 2 de la partie électromagnétique du régulateur situé au-dessus de la pompe ;
  • la fig. 2 est une coupe horizontale selon IIII de la fig. 1; et
  • la fig. 3 est un schéma d'ensemble de la régulation.
Other features of the invention will appear in the following description of an embodiment taken as an example and shown in the attached drawing, in which:
  • - Figure 1 is a partial sectional elevation along II of Figure 2 of the electromagnetic part of the regulator located above the pump;
  • fig. 2 is a horizontal section along IIII of FIG. 1; and
  • fig. 3 is an overall diagram of the regulation.

Sur la fig. 3 on a représenté par 1 un arbre mécanique, solidaire en rotation de l'arbre de la pompe ou du moteur, et comportant une roue dentée quelconque, non représentée, tournant en regard d'un capteur électromagnétique 2, dont les signaux sont repris par un compteur 3 qui les met en forme et effectue le comptage des impulsions produites au cours de périodes de temps successives, elles-mêmes fournies par une base de temps intégrée au compteur. On obtient ainsi en sortie du compteur un signal numérique RM représentatif du régime moteur.In fig. 3 there is shown by 1 a mechanical shaft, integral in rotation with the shaft of the pump or of the motor, and comprising any toothed wheel, not shown, rotating opposite an electromagnetic sensor 2, the signals of which are taken up by a counter 3 which formats them and counts the pulses produced during successive time periods, which are themselves supplied by a time base integrated into the counter. A digital signal RM representative of the engine speed is thus obtained at the output of the counter.

La manette de commande, non représentée, fournie en 4 un signal analogique qui est transformé par un convertisseur analogique/numérique 5 en un signal numérique RC représentatif de la valeur de consigne du régime moteur. Naturellement en variante, la manette de commande pourrait fournir directement une valeur numérique de consigne.The control handle, not shown, supplies at 4 an analog signal which is transformed by an analog / digital converter 5 into a digital signal RC representative of the set value of the engine speed. Of course as a variant, the control handle could directly supply a digital setpoint value.

Les deux valeurs numériques RC et RM sont comparées dans un comparateur numérique 6 qui en effectue leur différence afin d'élaborer un signal d'erreur SE qui constitue le signal d'entrée d'un régulateur électronique 7. Ce régulateur comporte notamment un microprocesseur et les registres de mémoire ainsi que les instructions de programmation pour pouvoir traiter ce signal d'erreur SE afin d'élaborer par calcul numérique les termes respectivement proportionnel, intégral, et dérivé selon la théorie générale de la régulation. Ces termes, multipliés par des constantes respectives déterminées expérimentalement, sont combinés pour fournir le signal numérique de consigne de la position de la soupape CS.The two digital values RC and RM are compared in a digital comparator 6 which performs their difference in order to develop an error signal SE which constitutes the input signal of an electronic regulator 7. This regulator notably comprises a microprocessor and the memory registers as well as the programming instructions to be able to process this error signal SE in order to develop by numerical calculation the terms respectively proportional, integral, and derivative according to the general theory of the regulation. These terms, multiplied by respective constants determined experimentally, are combined to provide the digital reference signal for the position of the valve CS.

Ce signal de consigne de soupape CS est envoyé à un servomoteur 8 qui commande par un arbre 9 la soupape de dosage 10, laquelle règle le débit envoyé par 11 à la pompe et au moteur 12. Ce servomoteur inclut un détecteur angulaire de la position de l'arbre 9, donc de la soupape 10, qui fournit un signal numérique AS représentatif de cet angle d'ouverture à un comparateur intégré au servomoteur et qui compare l'angle d'ouverture de soupape AS à la consigne soupape CS pour déterminer un signal d'erreur et entraîner en conséquence la rotation du servomoteur 8 dans le sens voulu pour annuler l'écart.This valve setpoint signal CS is sent to a servomotor 8 which controls the metering valve 10 by a shaft 9, which regulates the flow rate sent by 11 to the pump and to the motor 12. This servomotor includes an angular position detector. the shaft 9, therefore of the valve 10, which provides a digital signal AS representative of this opening angle to a comparator integrated into the servomotor and which compares the valve opening angle AS with the valve setpoint CS to determine a error signal and consequently rotate the servomotor 8 in the desired direction to cancel the deviation.

En particulier, ce servomoteur peut être constitué par un servomoteur de type courant en modélisme et qui est commandé généralement par un signal d'entrée CS en courant haché dont le rapport cyclique représente sous une forme analogique la valeur de consigne, la détermination angulaire AS étant elle-même opérée dans ce cas par voie analogique.In particular, this servomotor can be constituted by a servomotor of the current type in model making and which is generally controlled by a signal CS chopped current input whose duty cycle represents the setpoint in analog form, the angular determination AS being itself operated in this case by analog means.

Comme on le voit sur la fig. 1, entre le servomoteur 8 et l'arbre 9 de commande de la soupape de dosage 10 est interposé un réducteur approprié 13 pour un débattement angulaire maximum d'environ 90° utilisé pour la commande de modèle réduit.As seen in fig. 1, between the servomotor 8 and the shaft 9 for controlling the metering valve 10 is interposed an appropriate reduction gear 13 for a maximum angular clearance of approximately 90 ° used for the control of a reduced model.

En réalité comme représenté sur les fig. 1 et 2, la commande en rotatior de la soupape de dosage la par l'arbre 9 n'est pas une commande directe mais comporte une liaison unilatérale pour permettre de surimposer une commande dans le sens de la fermeture de la soupape de dosage 10 sous l'effet d'une barre de commande de stop 14 de type habituel. Pour cela le levier de commande 15 solidaire de la soupape de dosage 10 comporte un axe d'extrémité 16 de type habituel, qui est réuni à l'extrémité 17 d'un levier d'actionnement 18 disposé dans le carter 19. Ce levier 18 est solidaire de l'extrémité intérieure d'un arbre 20 accouplé par un accouplement 21 à l'arbre 9 sortant du motoréducteur, la liaison entre 16 et 17 étant assurée par une tringlerie habituelle 22, à actionnement unilatéral et ressort de rattrapage de jeu 23, du type utilisé dans le dispositif de régulation mécanique rappelé plus haut pour relier ce même levier de commande 15 à la palette du régulateur mécanique, laquelle est évidemment absente dans le cas de l'invention, de même que le ressort de régulation, les masselottes centrifuges et les pièces annexes de commande.In reality as shown in figs. 1 and 2, the rotary control of the metering valve la by the shaft 9 is not a direct control but has a one-sided connection to allow superimposition of a control in the direction of closing the metering valve 10 under the effect of a stop bar 14 of the usual type. For this, the control lever 15 integral with the metering valve 10 has an end pin 16 of the usual type, which is joined at the end 17 of an actuating lever 18 disposed in the housing 19. This lever 18 is integral with the inner end of a shaft 20 coupled by a coupling 21 to the shaft 9 exiting the gearmotor, the connection between 16 and 17 being provided by a standard linkage 22, with unilateral actuation and play take-up spring 23 , of the type used in the mechanical regulation device mentioned above to connect this same control lever 15 to the pallet of the mechanical regulator, which is obviously absent in the case of the invention, as well as the regulation spring, the counterweights centrifuges and associated control parts.

Grâce à l'invention, on peut déterminer expérimentalement les constantes des éléments proportionnel, intégral et dérivé du régulateur 7 de manière que la régulation comporte les caractéristiques voulues, en particulier une bonne rapidité de réponse jointe à une stabilité du régime vis-à-vis des perturbations du couple résistant, ces qualités étant particulièrement appréciables pour l'application aux tracteurs agricoles.Thanks to the invention, it is possible to determine experimentally the constants of the proportional, integral and derived elements of the regulator 7 so that the regulation has the desired characteristics, in particular a good speed of response combined with a stability of the regime vis-à-vis disturbances in the resisting torque, these qualities being particularly appreciable for application to agricultural tractors.

En outre, sans aucune dépense supplémentaire, on dispose dans le compteu] 3 et dans le régulateur 7 des valeurs numériques représentatives respectivement du régime moteur et de l'angle d'ouverture de la soupape de dosage, valeurs qui sont disponibles pour d'autres utilisations, par exemple pour déterminer immédiatement, par simple transformation, telle qu'une simple consultation de table de valeurs, les valeurs respectives du couple moteur et de la consommation instantanée afin de faciliter la conduite économique du véhicule.In addition, without any additional expense, there are in the counter 3 and in the regulator 7 numerical values representative respectively of the engine speed and of the opening angle of the metering valve, values which are available for other uses, for example to determine immediately, by simple transformation, such as a simple consultation of a table of values, the respective values of the engine torque and instant consumption to facilitate economical driving of the vehicle.

Pour l'application aux poids-lourds, l'invention permet également de réaliser facilement un limiteur de vitesse par simple programmation du régulateur 7 en évitant l'addition de l'actionneur limiteur habituel.For application to heavy goods vehicles, the invention also makes it possible to easily produce a speed limiter by simply programming the governor 7 while avoiding the addition of the usual limiting actuator.

Claims (5)

1. Dispositif de régulation électronique d'une pompe à injection d'un moteur Diesel de véhicule dans laquelle une soupape de dosage (10) règle le débit de combustible, ce dispositif comportant : - un détecteur numérique (2, 3) du régime du moteur ou de la pompe engendrant un signal numérique (RM) représentatif du régime moteur, - un détecteur numérique (4,5) de la position de la manette de commande du régime moteur fournissant un signal numérique (RC) représentatif de la valeur de consigne du régime moteur, - un comparateur numérique (6) élaborant un signal numérique d'erreur (SE) comme différence entre les deux signaux précédents (SE - RC - RM), - un régulateur numérique (7) de type proportionnel, intégral et dérivé élaborant, à l'aide d'un microprocesseur, de mémoires internes et de programmes, et à partir du signal d'erreur précédent (SE), un signal (CS) de consigne de la soupape de dosage (10),et - un servomoteur (8,9) pour positionner la soupape de dosage dans une position correspondant à la valeur de consigne (CS) précédente,caractérisé par le fait que ledit servomoteur est un servomoteur électrique (8, 9), que le signal de consigne de soupape (CS) fourni par le régulateur (7) au servomoteur (8) est constitué par un courant haché de rapport cyclique variable, et que ce servomoteur comporte une boucle d'asservissement de position avec un contrôle analogique de l'angle d'ouverture de la soupape.1. An electronic regulation device for an injection pump of a vehicle diesel engine in which a metering valve (10) regulates the fuel flow, this device comprising: - a digital detector (2, 3) of the engine or pump speed generating a digital signal (RM) representative of the engine speed, - a digital detector (4,5) of the position of the engine speed control lever providing a digital signal (RC) representative of the engine speed setpoint, - a digital comparator (6) producing a digital error signal (SE) as the difference between the two previous signals (SE - RC - RM), - a digital regulator (7) of proportional, integral and derivative type developing, using a microprocessor, internal memories and programs, and from the previous error signal (SE), a signal (CS) setpoint of the metering valve (10), and - a servomotor (8,9) to position the metering valve in a position corresponding to the previous setpoint (CS), characterized by the fact that said servomotor is an electric servomotor (8, 9), that the valve setpoint signal (CS) supplied by the regulator (7) to the servomotor (8) consists of a chopped current of variable duty cycle, and that this actuator has a position control loop with analog control of the valve opening angle. 2. Dispositif selon la revendication 1, caractérisé par le fait que le détecteur numérique du régime moteur comporte un capteur électromagnétique (2) disposé en regard d'une roue dentée solidaire en rotation d'un arbre (1) du moteur ou de la pompe et dont les signaux sont mis en forme puis comptés par un dispositif de comptage (2) au cours de périodes de temps successives déterminées par une base de temps afin d'élaborer les signaux numériques (RM) représentatifs du régime moteur.2. Device according to claim 1, characterized in that the digital engine speed detector comprises an electromagnetic sensor (2) disposed opposite a toothed wheel secured in rotation of a motor or pump shaft (1) and whose signals are shaped and then counted by a counting device (2) during successive time periods determined by a time base in order to develop the digital signals (RM) representative of the engine speed. 3. Dispositif selon une des revendications précédentes, caractérisé par le fait que le détecteur numérique de position de la manette de commande comporte une détection analogique par potentiomètre suivie par un convertisseur analogue/numérique (5) qui élabore le signal numérique (RC) de consigne du régime moteur.3. Device according to one of the preceding claims, characterized in that the digital position detector of the control handle comprises an analog detection by potentiometer followed by an analog / digital converter (5) which generates the digital signal (RC) of reference engine speed. 4. Dispositif selon une des revendications précédentes, caractérisé par le fait que les signaux numériques de régime moteur (RM) et de consigne de la soupape, élaborés respectivement par le compteur (3) et le régulateur (7), sont utilisés en outre pour assurer des fonctions annexes, telles que la détermination du couple moteur ou de la consommation, ou encore la limitation de vitesse du véhicule.4. Device according to one of the preceding claims, characterized in that the digital engine speed (RM) and valve setpoint signals, produced respectively by the counter (3) and the regulator (7), are also used to perform ancillary functions, such as determining the engine torque or consumption, or even limiting the vehicle speed. 5. Dispositif selon une des revendications précédentes, caractérisé par le fait que l'arbre (9) de sortie du servomoteur (8), après une réduction (13), commande le levier (15) de la soupape de dosage (10) par l'intermédiaire d'une transmission unilatérale (22) avec rattrapage de jeu (23) de type usuel.5. Device according to one of the preceding claims, characterized in that the shaft (9) of the actuator output (8), after a reduction (13), controls the lever (15) of the metering valve (10) by via a one-sided transmission (22) with backlash (23) of the usual type.
EP84400786A 1983-04-22 1984-04-19 Servo-control system for the speed of a diesel engine by electronically regulating the fuel delivery Withdrawn EP0127495A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306668A FR2544798B1 (en) 1983-04-22 1983-04-22 DEVICE FOR CONTROLLING THE RPM OF A DIESEL ENGINE BY ELECTRONIC REGULATION OF THE FUEL FLOW INJECTED BY THE INJECTION PUMP
FR8306668 1983-04-22

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EP0127495A1 true EP0127495A1 (en) 1984-12-05

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP0216111A2 (en) * 1985-08-27 1987-04-01 Hitachi, Ltd. Fuel injection system and control method therefor
CN105545524A (en) * 2014-10-31 2016-05-04 北京精密机电控制设备研究所 Electromechanical servo type engine flow adjusting mechanism

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3502255A1 (en) * 1985-01-24 1986-07-24 Linde Ag, 6200 Wiesbaden ELECTRICAL CONTROL DEVICE FOR THE SPEED CONTROL OF AN INTERNAL COMBUSTION ENGINE
GB8521244D0 (en) * 1985-08-24 1985-10-02 Gas Power International Ltd Dual fuel compression ignition engine

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US3724430A (en) * 1969-10-15 1973-04-03 Bosch Gmbh Robert Fuel injection regulator for internal combustion engines
US3777174A (en) * 1971-03-02 1973-12-04 Mtu Friedrichshafen Gmbh Electronic speed regulator for internal combustion engines
US3903852A (en) * 1972-10-24 1975-09-09 Fiat Spa Fuel injection plant for internal combustion engines
FR2329855A1 (en) * 1975-10-29 1977-05-27 Alsthom Cgee Speed regulator for IC engines - has difference between actual and desired speeds fed to DC motor to adjust fuel feed
US4036193A (en) * 1971-07-30 1977-07-19 Diesel Kiki Kabushiki Kaisha Electronically controlled fuel injection pump
GB2078400A (en) * 1980-06-21 1982-01-06 Bosch Gmbh Robert Control means for speed control of a compression ignition internal combustion engine

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Publication number Priority date Publication date Assignee Title
US3724430A (en) * 1969-10-15 1973-04-03 Bosch Gmbh Robert Fuel injection regulator for internal combustion engines
US3777174A (en) * 1971-03-02 1973-12-04 Mtu Friedrichshafen Gmbh Electronic speed regulator for internal combustion engines
US4036193A (en) * 1971-07-30 1977-07-19 Diesel Kiki Kabushiki Kaisha Electronically controlled fuel injection pump
US3903852A (en) * 1972-10-24 1975-09-09 Fiat Spa Fuel injection plant for internal combustion engines
FR2329855A1 (en) * 1975-10-29 1977-05-27 Alsthom Cgee Speed regulator for IC engines - has difference between actual and desired speeds fed to DC motor to adjust fuel feed
GB2078400A (en) * 1980-06-21 1982-01-06 Bosch Gmbh Robert Control means for speed control of a compression ignition internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0216111A2 (en) * 1985-08-27 1987-04-01 Hitachi, Ltd. Fuel injection system and control method therefor
EP0216111B1 (en) * 1985-08-27 1990-10-31 Hitachi, Ltd. Fuel injection system and control method therefor
CN105545524A (en) * 2014-10-31 2016-05-04 北京精密机电控制设备研究所 Electromechanical servo type engine flow adjusting mechanism

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FR2544798B1 (en) 1987-12-11
FR2544798A1 (en) 1984-10-26

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