EP0412010A1 - Method for regulating the idle-running of an internal combustion engine - Google Patents
Method for regulating the idle-running of an internal combustion engine Download PDFInfo
- Publication number
- EP0412010A1 EP0412010A1 EP90402204A EP90402204A EP0412010A1 EP 0412010 A1 EP0412010 A1 EP 0412010A1 EP 90402204 A EP90402204 A EP 90402204A EP 90402204 A EP90402204 A EP 90402204A EP 0412010 A1 EP0412010 A1 EP 0412010A1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
- F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/002—Electric control of rotation speed controlling air supply
- F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
- F02D31/005—Electric control of rotation speed controlling air supply for idle speed control by controlling a throttle by-pass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1015—Engines misfires
Definitions
- the invention relates to regulating the engine speed at idle for internal combustion engines comprising an idle control computer which controls a solenoid valve bypass of the throttle valve, making it possible to modify the filling of the engine in order to regulate the idling and also for gasoline engines with single-point or multi-point injection comprising a computer which controls both the injection of gasoline, to ensure the desired richness at all speeds, ignition, and also a butterfly bypass solenoid valve, making it possible to modify filling the engine to regulate idling.
- the object of the invention is to find a method for regulating the idling of such an engine, implemented in the usual computer for controlling the air valve, and which eliminates the above drawbacks, by simplifying the device, in particular by the removal of most sensors, while improving its operational safety and performance.
- the duty cycle of the opening of the air valve which according to custom, is calculated by adding a constant, an integral term and a proportional term, is added a differential term calculated directly from the derivative with respect to the time of the period between two high dead centers, suitably filtered and multiplied by a variable gain according to various parameters.
- filtering is ensured by calculation, not in relation to time but in relation to the number of top dead centers, by calculating the gross derivative at each top dead center by multiplying by a scale factor the difference between the measured period and the previous period, then calculating the filtered derivative by incrementing the previous value of this derivative by only a certain fraction of the difference between the gross derivative and this previous value.
- variable gain is calculated by performing the product of several terms evaluated from tables, each according to a parameter.
- the first term taking into account the variations of the regime is calculated, to the nearest sign and to a factor near, by multiplying the derivative previously evaluated by the square of the regime, the result being used as input in a table which gives the factor of diet correction.
- a second oscillation frequency correction term is also calculated by a table with an accumulation function at the input which is incremented by a first value, and capped at a maximum, if the speed variation function calculated previously leaves the band corresponding to a certain hysteresis value on either side of the zero, and decremented by a second value at each top dead center, with a floor value.
- a third term is a function of the water temperature and also calculated by a table as a function of the measured water temperature.
- the filtering takes place not with respect to time but with respect to the number of top dead centers.
- variable gain G is calculated by performing the product of several corrective terms evaluated from tables, each as a function of a parameter.
- the second term is preferably a frequency correction term CF, also evaluated from a table as a function of an accumulation function F, translating the number and amplitude of oscillations of the term DN.
- Figures 1 and 2 illustrate the application of such a variation and we see the various increases corresponding to the various crossings of the curves -h, + h by the DN function, as well as the reinitialization of this function after a defined time.
- a third CT correction term temperature is also evaluated by a table as a function of the TE water temperature measured directly.
- the influence of the frequency correction term CF on the gain makes it possible to modify the differential correction in critical cases, such as high amplitude to high oscillations frequency, avoiding the risks of abrupt resumption of the injection after cut in deceleration, as well as the instabilities of the engine.
- the accumulation function F rises, possibly up to its ceiling, which corresponds to a reduction in gain, whereas on the contrary, in the case of stability, this function decreases, possibly up to 'at its floor value, which corresponds in the table to stronger gains.
- CT correction as a function of the water temperature makes it possible to take into account the needs of different engines, the non-linearity of the air valve, and the difference in engine sensitivity to stalling depending on the temperature.
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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)
Abstract
Description
L'invention concerne la régulation du régime du moteur au ralenti pour des moteurs à combustion interne comportant un calculateur de régulation du ralenti qui pilote une électrovanne de bipasse du papillon, permettant de modifier le remplissage du moteur en vue de réguler le ralenti et également pour des moteurs à essence à injection monopoint ou multipoint comportant un calculateur qui pilote à la fois l'injection d'essence, pour assurer la richesse voulue à tous les régimes, l'allumage, et également une électrovanne de bipasse du papillon, permettant de modifier le remplissage du moteur en vue de réguler le ralenti.The invention relates to regulating the engine speed at idle for internal combustion engines comprising an idle control computer which controls a solenoid valve bypass of the throttle valve, making it possible to modify the filling of the engine in order to regulate the idling and also for gasoline engines with single-point or multi-point injection comprising a computer which controls both the injection of gasoline, to ensure the desired richness at all speeds, ignition, and also a butterfly bypass solenoid valve, making it possible to modify filling the engine to regulate idling.
On sait que, sur de tels moteurs, on a intérêt à ménager un volume d'admission important en aval du papillon des gaz pour améliorer la puissance. Il en résulte, par contre, une grande inertie pour la régulation qui, lors des retours au ralenti, peut conduire jusqu'au calage du moteur. Cet inconvénient est encore aggravé par la présence sur le véhicule de consommateurs d'énergie, tels que direction assistée, boîte de vitesses automatique, climatisation, qui perturbent de manière variable le ralentissement du moteur.It is known that, on such engines, it is advantageous to provide a large intake volume downstream of the throttle valve to improve power. This results, on the other hand, in a great inertia for the regulation which, when returning to idle, can drive until the engine stalls. This drawback is further aggravated by the presence on the vehicle of energy consumers, such as power steering, automatic gearbox, air conditioning, which vary disturbingly the slowing down of the engine.
En raison de ces difficultés, la régulation du ralenti par action sur l'électrovanne a jusqu'ici été limitée à une régulation comportant un terme proportionnel et un terme intégral, mais sans terme différentiel en raison des grandes fluctuations des paramètres lors du retour au ralenti. En outre, il a été nécessaire d'ajouter de nombreux capteurs dont un pressostat de direction assistée, et des capteurs d'état de fonctionnement de la boîte de vitesses automatique s'il y a lieu ou de la climatisation, afin d'agir sur le calculateur pour accroître en conséquence l'ouverture de la vanne afin de pallier tout calage lors du fonctionnement de ces consommateurs. L'ensemble est finalement assez compliqué et d'un fonctionnement néanmoins assez peu satisfaisant.Because of these difficulties, the regulation of idling by action on the solenoid valve has so far been limited to a regulation comprising a proportional term and an integral term, but without differential term due to the large fluctuations of the parameters during the return to idling. . In addition, it was necessary to add many sensors including a power steering pressure switch, and sensors for the operating status of the automatic gearbox if applicable or the air conditioning, in order to act on the computer to consequently increase the opening of the valve in order to compensate for any stalling during the operation of these consumers. The whole is ultimately quite complicated and nevertheless quite unsatisfactory in operation.
Le but de l'invention est de trouver un procédé de régulation du ralenti d'un tel moteur, mis en oeuvre dans le calculateur habituel pour commander la vanne d'air, et qui élimine les inconvénients précédents, en simplifiant le dispostif, notamment par la suppression de la plupart des capteurs, tout en améliorant sa sécurité de fonctionnement et ses performances.The object of the invention is to find a method for regulating the idling of such an engine, implemented in the usual computer for controlling the air valve, and which eliminates the above drawbacks, by simplifying the device, in particular by the removal of most sensors, while improving its operational safety and performance.
Conformément à l'invention, le rapport cyclique de l'ouverture de la vanne d'air, qui selon l'habitude, est calculé par addition d'une constante, d'un terme intégral et d'un terme proportionnel, se voit rajouter un terme différentiel calculé directement à partir de la dérivée par rapport au temps de la période entre deux points morts hauts, convenablement filtrée et multipliée par un gain variable en fonction de divers paramètres.In accordance with the invention, the duty cycle of the opening of the air valve, which according to custom, is calculated by adding a constant, an integral term and a proportional term, is added a differential term calculated directly from the derivative with respect to the time of the period between two high dead centers, suitably filtered and multiplied by a variable gain according to various parameters.
En particulier, le filtrage est assuré par le calcul, non par rapport au temps mais par rapport au nombre de points morts hauts, en calculant à chaque point mort haut la dérivée brute en multipliant par un facteur d'échelle la différence entre la période mesurée et la période précédente, puis en calculant la dérivée filtrée en incrémentant la valeur précédente de cette dérivée d'une certaine fraction seulement de la différence entre la dérivée brute et cette valeur précédente.In particular, filtering is ensured by calculation, not in relation to time but in relation to the number of top dead centers, by calculating the gross derivative at each top dead center by multiplying by a scale factor the difference between the measured period and the previous period, then calculating the filtered derivative by incrementing the previous value of this derivative by only a certain fraction of the difference between the gross derivative and this previous value.
Par ailleurs, le gain variable est calculé en effectuant le produit de plusieurs termes évalués à partir de tables, chacun en fonction d'un paramètre.Furthermore, the variable gain is calculated by performing the product of several terms evaluated from tables, each according to a parameter.
En particulier, le premier terme tenant compte des variations du régime est calculé, au signe près et à un facteur près, en multipliant la dérivée précédemment évaluée par le carré du régime, le résultat étant utilisé en entrée dans une table qui donne le facteur de correction de régime.In particular, the first term taking into account the variations of the regime is calculated, to the nearest sign and to a factor near, by multiplying the derivative previously evaluated by the square of the regime, the result being used as input in a table which gives the factor of diet correction.
Un deuxième terme de correction de fréquence des oscillations est calculé également par une table avec en entrée une fonction d'accumulation qui se trouve incrémentée d'une première valeur, et plafonnée à un maximum, si la fonction de variation du régime calculée précédemment sort de la bande correspondant à une certaine valeur d'hystérésis de part et d'autre du zéro, et décrémentée d'une seconde valeur à chaque point mort haut, avec une valeur plancher.A second oscillation frequency correction term is also calculated by a table with an accumulation function at the input which is incremented by a first value, and capped at a maximum, if the speed variation function calculated previously leaves the band corresponding to a certain hysteresis value on either side of the zero, and decremented by a second value at each top dead center, with a floor value.
Enfin, un troisième terme est fonction de la température de l'eau et calculé également par une table en fonction de la température de l'eau mesurée.Finally, a third term is a function of the water temperature and also calculated by a table as a function of the measured water temperature.
D'autres particularités de l'invention apparaîtront dans la description qui va suivre d'un mode de mise en oeuvre pris comme exemple en se référant aux diagrammes annexés, parmi lesquels :
- la figure 1 représente en fonction du nombre de points morts hauts, les variations du terme de variations de régime en fonction du temps; et
- la figure 2 reprsente, toujours en fonction du nombre de points morts hauts, la valeur de la fonction d'accumulation.
- FIG. 1 shows, as a function of the number of top dead centers, the variations in the term of variations in speed as a function of time; and
- Figure 2 shows, still depending on the number of top dead centers, the value of the accumulation function.
Conformément à l'invention, le rapport cyclique d'ouverture R de la vanne d'air est calculé par l'expression
R = C + TI + TP + TD
dans laquelle les trois premiers termes sont les termes habituels, à savoir une constante C, un terme intégral TI et un terme proportionnel TP, TD étant le terme différentiel rajouté conformément à l'invention.According to the invention, the opening duty cycle R of the air valve is calculated by the expression
R = C + TI + TP + TD
in which the first three terms are the usual terms, namely a constant C, an integral term TI and a proportional term TP, TD being the differential term added in accordance with the invention.
Ce terme différentiel TD est calculé directement en prenant la dérivée D par rapport au temps de la période P entre deux points morts hauts, convenablement filtrée et mutlipliée par un gain G variable en fonction de divers paramètres, de manière que l'on ait
TD = G x DThis differential term TD is calculated directly by taking the derivative D with respect to the time of the period P between two high dead centers, suitably filtered and multiplied by a gain G variable according to various parameters, so that we have
TD = G x D
Conformément à l'invention, le filtrage a lieu non par rapport au temps mais par rapport au nombre de points morts hauts. Pour cela, à chaque point mort haut d'indice i, on calcule la dérivée brute B en multipliant par un facteur b l'écart entre la période Pi (nombre d'impulsions d'horloge comptabilisé entre deux points morts hauts) et la période précédente Pi-1 mise en mémoire, donc
B = b(Pi-Pi-1)According to the invention, the filtering takes place not with respect to time but with respect to the number of top dead centers. For this, at each top dead center of index i, the gross derivative B is calculated by multiplying by a factor b the difference between the period P i (number of clock pulses counted between two top dead centers) and the previous period P i-1 stored, so
B = b (P i -P i-1 )
D'autre part, la dérivée filtrée à l'instant i est calculée par
Di = Di-1 + a (B-Di-1)
c'est-à-dire en incrémentant la valeur précédente de valeur filtrée Di-1 d'une fraction seulement a de l'écart entre la dérivée brute et cette valeur précédente.On the other hand, the derivative filtered at time i is calculated by
Di = D i-1 + a (BD i-1 )
that is to say by incrementing the previous value of filtered value D i-1 by only a fraction of the difference between the gross derivative and this previous value.
D'autre part, conformément à l'invention, le gain variable G est calculé en effectuant le produit de plusieurs termes correctifs évalués à partir de tables, chacun en fonction d'un paramètre.On the other hand, in accordance with the invention, the variable gain G is calculated by performing the product of several corrective terms evaluated from tables, each as a function of a parameter.
Le premier de ces termes est un terme de correction en fonction du régime CR. Il est calculé par une table, par exemple en neuf points, en fonction d'un facteur signé DN de variation du régime, lui-même calculé par
DN = - D x Nx/k
dans laquelle N est le régime moteur et k un facteur choisi, comme b, pour que les variations pratiques utilisent au mieux la capacité des registres utilisés et x une valeur calibrable. Il y a, en outre, intérêt à choisir pour la valeur de k une puissance de 2 pour remplacer la division par un simple décalage des bits, ou plus simplement encore, en sélectionnant l'octet de poids fort.The first of these terms is a correction term based on the CR regime. It is calculated by a table, for example at nine points, according to a signed factor DN of variation of the regime, itself calculated by
DN = - D x N x / k
in which N is the engine speed and k a factor chosen, like b, so that the practical variations make the best use of the capacity of the registers used and x a calibratable value. There is, moreover, interest in choosing for the value of k a power of 2 to replace the division by a simple shift of the bits, or more simply still, by selecting the most significant byte.
Le deuxième terme est de préférence un terme de correction de fréquence CF, évalué également à partir d'une table en fonction d'une fonction d'accumulation F, traduisant le nombre et l'amplitude d'oscillations du terme DN.The second term is preferably a frequency correction term CF, also evaluated from a table as a function of an accumulation function F, translating the number and amplitude of oscillations of the term DN.
Les figures 1 et 2 illustrent l'application d'une telle variation et l'on voit les divers accroissements correspondant aux divers franchissements des courbes -h, +h par la fonction DN, ainsi que la réinitialisation de cette fonction au bout d'un temps défini.Figures 1 and 2 illustrate the application of such a variation and we see the various increases corresponding to the various crossings of the curves -h, + h by the DN function, as well as the reinitialization of this function after a defined time.
Enfin, un troisième terme CT de correction de température est également évalué par une table en fonction de la température de l'eau TE mesurée directement.Finally, a third CT correction term temperature is also evaluated by a table as a function of the TE water temperature measured directly.
En définitive, le gain G est calculé par
G = CR x CF x CT.Ultimately, the gain G is calculated by
G = CR x CF x CT.
En conséquence, l'application par le calculateur habituel du procédé selon l'invention, permet une grande simplification de l'ensemble du dispositif en le débarrassant des nombreux capteurs d'état et du pressostat de direction assistée.Consequently, the application by the usual computer of the method according to the invention allows a great simplification of the whole of the device by ridding it of the numerous state sensors and of the power steering pressure switch.
D'autre part, il en résulte une très grande simplification du calibrage des paramètres, étant donné que les divers paramètres une fois déterminés ont une valeur quasiment universelle. Seule la table de correction de température CT est à adapter au type de moteur et à la cylindrée.On the other hand, this results in a very great simplification of the calibration of the parameters, given that the various parameters once determined have an almost universal value. Only the temperature correction table CT is to be adapted to the type of engine and the displacement.
Enfin, il en résulte une très grande efficacité pour les raisons suivantes :
- la présence du terme différentiel TD dans le calcul de R supprime en grande partie l'effet nuisible dû au volume en aval du papillon (dit "effet plenum").
- la correction du gain variable G en fonction de DN tient compte du couple de frottements auquel est soumis le moteur et permet, par la table de correction en fonction du régime CR, d'avoir des gains différents, d'une part, pour les retours au ralenti normaux et pour les retours au ralenti à problème, notamnent lorsqu'un des consommateurs tire de la puissance sur le moteur et accroît les risques de calage et, d'autre part, pour les montées en régime et les décélérations avec vitesse engagée.
- l'influence du terme de correction de fréquence CF sur le gain permet de modifier la correction différentielle dans les cas critiques, tels que les oscillations de forte amplitude à haute fréquence, évitant les risques de reprise brutale de l'injection après coupure en décélération, ainsi que les instabilités du moteur. En effet, dans ces conditions, la fonction d'accumulation F s'élève, éventuellement jusqu'à son plafond, ce qui correspond à une réduction du gain, alors qu'au contraire, en cas de stabilité, cette fonction décroît, éventuellement jusqu'à sa valeur plancher, ce qui correspond dans la table à des gains plus forts.
- enfin, le terme CT de correction en fonction de la température de l'eau permet de tenir compte des besoins de moteurs différents, de la non linéarité de la vanne d'air, et de la différence de sensibilité du moteur au calage selon la température.Finally, this results in very high efficiency for the following reasons:
- the presence of the differential term TD in the calculation of R largely eliminates the harmful effect due to the volume downstream of the butterfly (called "plenum effect").
- the correction of the variable gain G as a function of DN takes account of the friction torque to which the motor is subjected and allows, by the correction table according to the speed CR, to have different gains, on the one hand, for the normal idling and problematic idling, especially when one of the consumers draws power from the engine and increases the risk of stalling and, on the other hand, for revving and decelerating with gear engaged .
- the influence of the frequency correction term CF on the gain makes it possible to modify the differential correction in critical cases, such as high amplitude to high oscillations frequency, avoiding the risks of abrupt resumption of the injection after cut in deceleration, as well as the instabilities of the engine. In fact, under these conditions, the accumulation function F rises, possibly up to its ceiling, which corresponds to a reduction in gain, whereas on the contrary, in the case of stability, this function decreases, possibly up to 'at its floor value, which corresponds in the table to stronger gains.
- finally, the term CT correction as a function of the water temperature makes it possible to take into account the needs of different engines, the non-linearity of the air valve, and the difference in engine sensitivity to stalling depending on the temperature.
Claims (6)
caractérisé par le fait que le calculateur applique en outre un terme différentiel évalué en calculant directement la dérivée (D) par rapport au temps de la période (P) entre deux points morts hauts, convenablement filtrée et multipliée par un gain (G) variable en fonction de divers paramètres.1. Method for regulating the idle speed of an injection petrol engine, comprising a two-pass air valve of the throttle valve controlled by a chopped current whose opening duty cycle (R) is calculated by a computer applying a linear formula with constant term, integral term and proportional term,
characterized by the fact that the calculator also applies a differential term evaluated by directly calculating the derivative (D) with respect to the time of the period (P) between two top dead centers, suitably filtered and multiplied by a gain (G) variable in function of various parameters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8910439A FR2650633B1 (en) | 1989-08-02 | 1989-08-02 | METHOD FOR CONTROLLING THE SLOW MOTION OF AN INTERNAL COMBUSTION ENGINE |
| FR8910439 | 1989-08-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0412010A1 true EP0412010A1 (en) | 1991-02-06 |
| EP0412010B1 EP0412010B1 (en) | 1993-05-26 |
Family
ID=9384418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19900402204 Expired - Lifetime EP0412010B1 (en) | 1989-08-02 | 1990-08-01 | Method for regulating the idle-running of an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0412010B1 (en) |
| DE (1) | DE69001728T2 (en) |
| FR (1) | FR2650633B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112848C2 (en) * | 1991-04-19 | 2001-11-15 | Bosch Gmbh Robert | System for controlling the idle speed of an internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378766A (en) * | 1980-02-22 | 1983-04-05 | Nippondenso Co., Ltd. | Closed loop idle engine speed control with a valve operating relative to neutral position |
| EP0153012A2 (en) * | 1984-01-20 | 1985-08-28 | Honda Giken Kogyo Kabushiki Kaisha | Method of feedback-controlling idling speed of internal combustion engine |
| EP0206271A1 (en) * | 1985-06-24 | 1986-12-30 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for control of number of idling rotations of internal combustion engines |
| EP0223430A2 (en) * | 1985-10-21 | 1987-05-27 | Honda Giken Kogyo Kabushiki Kaisha | Method for controlling the solenoid current of a solenoid valve which controls the amount of suction of air in an internal combustion engine |
| EP0306906A2 (en) * | 1987-09-09 | 1989-03-15 | Jenbacher Werke AG | Feedback control device for the air-fuel ratio of a combustion engine |
-
1989
- 1989-08-02 FR FR8910439A patent/FR2650633B1/en not_active Expired - Fee Related
-
1990
- 1990-08-01 DE DE1990601728 patent/DE69001728T2/en not_active Expired - Fee Related
- 1990-08-01 EP EP19900402204 patent/EP0412010B1/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4378766A (en) * | 1980-02-22 | 1983-04-05 | Nippondenso Co., Ltd. | Closed loop idle engine speed control with a valve operating relative to neutral position |
| EP0153012A2 (en) * | 1984-01-20 | 1985-08-28 | Honda Giken Kogyo Kabushiki Kaisha | Method of feedback-controlling idling speed of internal combustion engine |
| EP0206271A1 (en) * | 1985-06-24 | 1986-12-30 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for control of number of idling rotations of internal combustion engines |
| EP0223430A2 (en) * | 1985-10-21 | 1987-05-27 | Honda Giken Kogyo Kabushiki Kaisha | Method for controlling the solenoid current of a solenoid valve which controls the amount of suction of air in an internal combustion engine |
| EP0306906A2 (en) * | 1987-09-09 | 1989-03-15 | Jenbacher Werke AG | Feedback control device for the air-fuel ratio of a combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69001728T2 (en) | 1993-11-25 |
| DE69001728D1 (en) | 1993-07-01 |
| FR2650633A1 (en) | 1991-02-08 |
| FR2650633B1 (en) | 1994-04-29 |
| EP0412010B1 (en) | 1993-05-26 |
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