FR2919025A1 - Electric voltage peak selecting method for combustion engine, involves preventing access to new voltage stored in memory after determined value during delay time, if new voltage is supplied, and resetting memory to zero at end of delay time - Google Patents
Electric voltage peak selecting method for combustion engine, involves preventing access to new voltage stored in memory after determined value during delay time, if new voltage is supplied, and resetting memory to zero at end of delay time Download PDFInfo
- Publication number
- FR2919025A1 FR2919025A1 FR0705268A FR0705268A FR2919025A1 FR 2919025 A1 FR2919025 A1 FR 2919025A1 FR 0705268 A FR0705268 A FR 0705268A FR 0705268 A FR0705268 A FR 0705268A FR 2919025 A1 FR2919025 A1 FR 2919025A1
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- FR
- France
- Prior art keywords
- memory
- current
- stored
- voltage
- delay time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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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
- F02D41/3005—Details not otherwise provided for
-
- 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
- F02D2041/1413—Controller structures or design
- F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2051—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using voltage control
-
- 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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
PROBLEME: TECHNIQUE Il peut être nécessaire de caractériser l'étatPROBLEM: TECHNIQUE It may be necessary to characterize the state
mécanique d'un dispositif électro-mécano-hydraulique, par exemple un injecteur de carburant dans un moteur à combustion, par l'analyse de l'instabilité d'amplitude d'un pic de tension électrique qui se produit lors d'un fonctionnement de l'actuateur, entre les bornes de branchement électrique. Il convient donc de sélectionner ce seul pic de tension électrique parmi de nombreux parasites se propageant sur la ligne sur laquelle est branché l'injecteur, dont certains sont, par exemples non limitatifs des pics provenant d'injecteurs voisins, ou bien des pics générés par d'autres organes étrangers, tels que les "buzzers" à la fréquence de 100 Hz. L'invention a pour objet de résoudre le problème de sélection du pic lié à l'injection, quel que soit le type de l'injecteur et quel que soit le champ de parasites perturbateurs. mechanical mechanism of an electro-mechanical-hydraulic device, for example a fuel injector in a combustion engine, by analyzing the instability of amplitude of a peak of electrical voltage which occurs during an operation of the actuator, between the electrical connection terminals. It is therefore appropriate to select this single peak of voltage among many parasites propagating on the line on which the injector is connected, some of which are, for example non-limiting peaks from neighboring injectors, or peaks generated by other foreign bodies, such as "buzzers" at the frequency of 100 Hz. The object of the invention is to solve the problem of selecting the peak related to the injection, whatever the type of the injector and which whatever the field of disturbing parasites.
L'ETAT DE L'ART Parmi tous les systèmes de "traitement du signal" existants, même sophistiqués, aucun ne vise à résoudre le problème technique précisément exposé et n'est adapté pour ce faire. Ce procédé peut être utilisé pour sélectionner les pics dans le cadre d'un procédé de diagnostic tel que décrit dans le brevet FR2891914. THE STATE OF THE ART Among all existing "signal processing" systems, even sophisticated, none is intended to solve the technical problem precisely stated and is not suitable for this purpose. This method can be used to select the peaks in the context of a diagnostic method as described in the patent FR2891914.
PRINCIPE DE L'INVENTION L'invention propose un procédé (REV1). Il consiste de manière à s'appliquer à tous les types d'injecteurs, à ne prendre en compte afin de le valider, que le pic de tension apparaissant le plus près, avant ou après l'instant to où apparaît le courant circulant dans l'actuateur. Ces deux intervalles de temps, référencés dans l'exposé D avant to et At après to, se déterminent en fonction des différents types d'actuateurs connus, et pourraient être ajustés sans que le principe de l'invention ne soit remis en cause s'il en apparaissait de nouveaux sur le marché. On peut en déterminer les valeurs au jour de la rédaction de la présente demande de brevet. PRINCIPLE OF THE INVENTION The invention proposes a method (REV1). It consists of applying to all types of injectors, to take into account in order to validate it, only the peak of voltage appearing closest, before or after the moment when the current flowing in the 'actuator. These two time intervals, referenced in the presentation D before to and At after to, are determined according to the different types of known actuators, and could be adjusted without the principle of the invention is questioned s' new ones appeared on the market. The values can be determined at the time of writing of this patent application.
Il convient de remarquer pour cela que le pic d'injection de l'actuateur piézo électrique se présente environ 100 microsecondes avant l'apparition du courant, que celui de l'injecteur pompe se présente environ2,5 millisecondes après l'apparition du courant, et que le cas de l'actuateur électromagnétique est intermédiaire. It should be noted that the injection peak of the piezoelectric actuator is about 100 microseconds before the onset of the current, that the pump injector is about 2.5 milliseconds after the onset of the current, and that the case of the electromagnetic actuator is intermediate.
Il va de soi que le délai D doit être supérieur à 100 microsecondes, et avantageusement fixé aux alentours de 300 microsecondes. At a vocation d'être un temps d'attente supérieur à 2,5 millisecondes, At est également choisi supérieur à la durée d'une injection complète afin qu'à l'expiration de At l'on puisse revenir à la configuration initiale dans laquelle ne subsiste que la remise à zéro automatique de la mémoire tampon, jusqu'à l'injection suivante. At est donc avantageusement fixé aux alentours de 4 millisecondes. La présence d'une" mémoire tampon", ou de tout autre dispositif assurant la même fonction, est nécessaire afin de stocker la valeur enregistrée du pic dés son apparition dans le capteur de tension afin que celle ci soit disponible quand on le désire. Cette mémoire peut être, à titre d'exemple non limitatif, de type capacitif et doit avoir un temps d'acquisition suffisamment court vis à vis de pics atteignant leur maximum d'amplitude en parfois une microseconde, d'où un temps d'acquisition de l'ordre de la microseconde. Cela étant, il est possible d'éliminer tout pic parasite s'étant présenté pendant 130 millisecondes environ écoulées depuis la précédente injection par une simple remise à zéro de la mémoire tampon après le délai D suivant l'acquisition, sauf si le courant est apparu pendant cette durée D, cette remise à zéro étant automatique. A contrario, dés que le courant apparaît ou est apparu depuis un certain temps limité à la valeur At, la mémoire tampon n'est pas remise à zéro. Cela permet de conserver la valeur d'un pic s'étant présenté dans le délai D précédant l'apparition du courant à to; cela permet également d'enregistrer un pic qui apparaîtrait au moment de l'apparition du courant ou après, pendant un temps At au delà de celle ci. Dans ces conditions, dés que l'on dispose d'une valeur de pic pendant l'intervalle At, on peut la valider en la transférant au système censé l'exploiter. Le pic a été sélectionné. Au cas où ce transfert ne pourrait pas se faire instantanément, il est indispensable d'interdire immédiatement l'accès dans la mémoire tampon à toute nouvelle tension pic qui pourrait apparaître et en fausser le contenu. En effet, cette nouvelle tension pic peut très bien être celle d'une injection partielle succédant à celle choisie pour son pic significatif, laquelle peut intervenir moins d'une milliseconde plus tard. Cette interdiction d'accès à la mémoire tampon est levée à l'issue du temps At, car la série d'injections partielles est terminée à ce moment là. Cette interdiction d'accès peut être réalisée notamment en court-circuitant les bornes d'entrée de la mémoire tampon, par un dispositif piloté par le microcontrôleur chargé de gérer l'ensemble du fonctionnement décrit dans la demande. Ce qui précède suppose qu'il n'y a pas d'erreur sur to, instant d'apparition du courant. It goes without saying that the delay D must be greater than 100 microseconds, and advantageously set at around 300 microseconds. In order to be a waiting time greater than 2.5 milliseconds, At is also chosen greater than the duration of a complete injection so that when At expires we can return to the initial configuration in which remains only the automatic reset of the buffer, until the next injection. At is therefore advantageously set around 4 milliseconds. The presence of a "buffer memory", or any other device providing the same function, is necessary in order to store the recorded value of the peak as soon as it appears in the voltage sensor so that it is available when desired. This memory may be, by way of a non-limiting example, of the capacitive type and must have a sufficiently short acquisition time with respect to peaks reaching their maximum amplitude, sometimes a microsecond, hence an acquisition time. of the order of the microsecond. However, it is possible to eliminate any parasitic peak that has occurred for about 130 milliseconds since the previous injection by simply resetting the buffer after the delay D after the acquisition, unless the current has appeared. during this duration D, this reset being automatic. On the contrary, as soon as the current appears or has appeared for a certain time limited to the value At, the buffer memory is not reset. This makes it possible to preserve the value of a peak having occurred in the delay D preceding the appearance of the current at to; this also allows to record a peak which would appear at the moment of the appearance of the current or after, during a time At beyond this one. Under these conditions, as soon as we have a peak value during the interval At, we can validate it by transferring it to the system supposed to exploit it. The peak has been selected. In case this transfer could not be done instantly, it is essential to immediately prohibit access to the buffer memory to any new peak voltage that may appear and distort the content. Indeed, this new peak voltage may very well be that of a partial injection succeeding that chosen for its significant peak, which may occur less than a millisecond later. This prohibition of access to the buffer is lifted at the end of the time At, because the series of partial injections is completed at this time. This access prohibition can be achieved in particular by short-circuiting the input terminals of the buffer memory, by a device controlled by the microcontroller responsible for managing all the operation described in the application. The above assumes that there is no error on to, moment of appearance of the current.
Il convient donc de supprimer les parasites de courant susceptibles de déclancher la validation de n'importe quel parasite de tension. Pour ce faire, on élimine les parasites de courant au profit du courant d'injection sur la base de la différence entre leurs spectres de fréquences constitutives. It is therefore necessary to eliminate the current parasites that could trigger the validation of any voltage parasite. To do this, the current parasites are eliminated in favor of the injection current on the basis of the difference between their constituent frequency spectra.
Les parasites, auxquels ne peut correspondre aucun débit de courant, car à leur apparition, le circuit électrique est ouvert, sont constitués de fréquences supérieures à environ 100 Khz. Le vrai courant d'injection, par contre, qui doit franchir l'impédance de l'actuateur, est dépourvu de fréquences au delà de 20 Khz, environ. The parasites, which can not correspond any current flow, because at their appearance, the electrical circuit is open, consist of frequencies greater than about 100 Khz. The real injection current, on the other hand, which must cross the impedance of the actuator, is devoid of frequencies beyond about 20 Khz.
II suffit d'intercaler dans le circuit de prélèvement du courant, par exemple non limitatif, un "quadrupole" faisant office de filtre passe-bas abrupt, c'est à dire de faible atténuation jusqu'à environ 20 Khz et de forte atténuation à partir de 1Mhz environ, cela afin d'éliminer les parasites. It suffices to insert in the current sampling circuit, for example non-limiting, a "quadrupole" acting as an abrupt low-pass filter, that is to say of low attenuation up to about 20 Khz and of high attenuation at from 1Mhz approximately, this to eliminate parasites.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0705268A FR2919025A1 (en) | 2007-07-20 | 2007-07-20 | Electric voltage peak selecting method for combustion engine, involves preventing access to new voltage stored in memory after determined value during delay time, if new voltage is supplied, and resetting memory to zero at end of delay time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0705268A FR2919025A1 (en) | 2007-07-20 | 2007-07-20 | Electric voltage peak selecting method for combustion engine, involves preventing access to new voltage stored in memory after determined value during delay time, if new voltage is supplied, and resetting memory to zero at end of delay time |
Publications (1)
Publication Number | Publication Date |
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FR2919025A1 true FR2919025A1 (en) | 2009-01-23 |
Family
ID=39145407
Family Applications (1)
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FR0705268A Withdrawn FR2919025A1 (en) | 2007-07-20 | 2007-07-20 | Electric voltage peak selecting method for combustion engine, involves preventing access to new voltage stored in memory after determined value during delay time, if new voltage is supplied, and resetting memory to zero at end of delay time |
Country Status (1)
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FR (1) | FR2919025A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2049567A5 (en) * | 1969-06-13 | 1971-03-26 | Sopromi Soc Proc Modern Inject | |
FR2323182A1 (en) * | 1975-09-03 | 1977-04-01 | Siemens Ag | MOUNTING FOR THE USE OF ELECTRICAL SIGNALS OF OUTPUT OF A DETECTOR DETECTING VARIATIONS IN THE THICKNESS OF A FUEL INJECTION LINE |
EP1698777A2 (en) * | 2005-02-23 | 2006-09-06 | Robert Bosch Gmbh | Method of operating an injector for an internal combustion engine |
US20060207564A1 (en) * | 2005-03-18 | 2006-09-21 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for internal combustion engine |
EP1746318A1 (en) * | 2005-07-22 | 2007-01-24 | Delphi Technologies, Inc. | Method and device for supervising and assessing the function of a piezoelectric actuator |
FR2891914A1 (en) * | 2005-10-06 | 2007-04-13 | Rene Girard | Hydraulic electro-mechanical device`s operation defect e.g. wear, diagnosing method for engine, involves detecting evolution of voltage pulses` amplitude, and identifying defects when evolution`s quantity exceeds threshold |
-
2007
- 2007-07-20 FR FR0705268A patent/FR2919025A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2049567A5 (en) * | 1969-06-13 | 1971-03-26 | Sopromi Soc Proc Modern Inject | |
FR2323182A1 (en) * | 1975-09-03 | 1977-04-01 | Siemens Ag | MOUNTING FOR THE USE OF ELECTRICAL SIGNALS OF OUTPUT OF A DETECTOR DETECTING VARIATIONS IN THE THICKNESS OF A FUEL INJECTION LINE |
EP1698777A2 (en) * | 2005-02-23 | 2006-09-06 | Robert Bosch Gmbh | Method of operating an injector for an internal combustion engine |
US20060207564A1 (en) * | 2005-03-18 | 2006-09-21 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for internal combustion engine |
EP1746318A1 (en) * | 2005-07-22 | 2007-01-24 | Delphi Technologies, Inc. | Method and device for supervising and assessing the function of a piezoelectric actuator |
FR2891914A1 (en) * | 2005-10-06 | 2007-04-13 | Rene Girard | Hydraulic electro-mechanical device`s operation defect e.g. wear, diagnosing method for engine, involves detecting evolution of voltage pulses` amplitude, and identifying defects when evolution`s quantity exceeds threshold |
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ST | Notification of lapse |
Effective date: 20110331 |