FR2494770A2 - Anti-knock ignition control circuit for IC engine - uses filter circuits and timing monostable to reject disturbances not caused by knocking - Google Patents

Anti-knock ignition control circuit for IC engine - uses filter circuits and timing monostable to reject disturbances not caused by knocking Download PDF

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Publication number
FR2494770A2
FR2494770A2 FR8122049A FR8122049A FR2494770A2 FR 2494770 A2 FR2494770 A2 FR 2494770A2 FR 8122049 A FR8122049 A FR 8122049A FR 8122049 A FR8122049 A FR 8122049A FR 2494770 A2 FR2494770 A2 FR 2494770A2
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FR
France
Prior art keywords
signal
frequency
knock
rectifier
speed
Prior art date
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Granted
Application number
FR8122049A
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French (fr)
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FR2494770B2 (en
Inventor
Ingo Dudeck
Manfred Maass
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.)
Daimler Benz AG
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Daimler Benz AG
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Filing date
Publication date
Priority claimed from DE2923056A external-priority patent/DE2923056C2/en
Priority claimed from DE19803044745 external-priority patent/DE3044745A1/en
Application filed by Daimler Benz AG filed Critical Daimler Benz AG
Publication of FR2494770A2 publication Critical patent/FR2494770A2/en
Application granted granted Critical
Publication of FR2494770B2 publication Critical patent/FR2494770B2/fr
Granted legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/152—Digital data processing dependent on pinking
    • F02P5/1526—Digital data processing dependent on pinking with means for taking into account incorrect functioning of the pinking sensor or of the electrical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Ignition Timing (AREA)

Abstract

The detector (1) senses acceleration and an amplifier (2) provides an input for a rejection filter (5) which allows the ignition knock signal to pass but which rejects frequencies below and above it. A speed sensor (12) coupled to the ignition system is connected to a processing circuit (11) which receives the output of the filter. This circuit comprises a monostable which short circuits the input to a rectifier (6a) for a defined time after each ignition pulse. The speed signal also controls the gain of an amplifier (6b) at the rectifier output to improve linearity for a reference signal (UR). This processing circuit prevents disturbances to the speed detector circuit from reducing the sensitivity of the system. The acoustic signal is also applied to a passband filter (3) in which the output pulses (UK) are compared (7) with the reference voltage. Any pulse exceeding the reference triggers a monostable (10) to produce ignition control signals.

Description

La présente invention concerne un dispositif pour la reconnaissance d'allures indésirables de combustion dans des moteurs à combustion interne à allumage extérieur, au moyen d'un capteur d'accélération et et d'un filtre passe- bande accorde sur la fréquence de cognement du moteur, dont la grandeur de sortie est comparée à une valeur de référence et dans lequel le résultat de la comparaison est lié aux allures indésirables de combustion à reconnattre, dispositif dans lequel le signal acoustique par conduction qui est reçu par le capteur d'accélération et qui traverse le filtre passe-bande est redressé par un redresseur en un signal à la fréquence de cognement, dans lequel en outre il est prévu un montage en série d'un filtre éliminateur de bande accordé sur la fréquence de cognement, d'un redresseur de valeur efficace et d'un amplificateur par lequel le signal acoustique reçu par le capteur d'accélération est converti en un signal de référence, et dans lequel enfin il est prévu un comparateur qui compare le signal de référence avec le signal de cognement et qui produit à sa sortie un signal lorsque le signal de cognement dépasse le signal de référence, conformément à la demande de brevet principal 80 12505, Dans ce dispositif, un signal de cognement constitué par le signal de sortie d'un capteur d'alimentation est comparé avec un signal de référence dérivé du même signal de sortie du capteur d'accél lération et le résultat de la comparaison est utilisé pour détecter des allures indésirables de combustion et pour la régulation du moteur. The present invention relates to a device for recognizing undesirable combustion stages in internal combustion engines with external ignition, by means of an acceleration sensor and a bandpass filter tuned to the knock frequency of the motor, the output of which is compared with a reference value and in which the result of the comparison is linked to the undesirable combustion stages to be recognized, device in which the acoustic conduction signal which is received by the acceleration sensor and which passes through the band-pass filter is rectified by a rectifier into a signal at the knock frequency, in which further provision is made for a series connection of a band eliminator filter tuned to the knock frequency, of a rectifier of rms value and of an amplifier by which the acoustic signal received by the acceleration sensor is converted into a reference signal, and in which finally a compa erator which compares the reference signal with the knock signal and which produces a signal at its output when the knock signal exceeds the reference signal, in accordance with main patent application 80 12505, In this device, a knock signal consisting by the output signal of a supply sensor is compared with a reference signal derived from the same output signal from the acceleration sensor and the result of the comparison is used to detect unwanted combustion stages and for regulation of the motor.

Il s'est avéré qu'aussi bien des bruits de basse fréquence que des harmoniques supérieures fortement accentuées de la fréquence de cognement ont une influence perturbatrice sur le signal de référence, que le signal de référence augmente, lorsque la vitesse de rotation croit, plus fortement que cela est nécessaire, ce qui se traduit par une réduction de la sensibilité de détection du cognement, et que des sé quences d'impulsions très élevées mais courtes et ne résultant cependant pas de bruits de cognement peuvent produire à l'entrée du comparateur le même signal que des groupes d'impulsions moins élevées et de longue durée, comme cela est typique pour des signaux de cognement. It turned out that both low frequency noises and strongly accentuated higher harmonics of the knock frequency have a disturbing influence on the reference signal, that the reference signal increases, when the speed of rotation increases, more strongly that this is necessary, which results in a reduction of the knock detection sensitivity, and that very high but short pulse sequences which do not however result in knock noises can produce at the input of the comparator the same signal as lower, long-lasting pulse groups, as is typical for knock signals.

L'invention a en conséquence pour but d'améliorer le dispositif proposé dans la demande de brevet principal de telle sorte que des perturbations non provoquées par un cognement du moteur ne puissent avoir aucune influence sur le signal de régulation. The invention therefore aims to improve the device proposed in the main patent application so that disturbances not caused by knocking of the engine can have no influence on the regulation signal.

Ce problème est résolu selon l'invention en ce que le filtre éliminateur de bande 5 est agencé de manière à laisser passer la fréquence de cognement fl, et à amortir toutes les fréquences situées en dessous dtune basse fréquence inférieure à la fréquence de cognement fK, et au-dessus d'une haute fréquence f supérieure à la fréquence de cogne
o ment fK,en ce qutil est prévu un dispositif de traitement en fonction de la vitesse de rotation 11, qui traite le signal de référence UR avec un facteur fonction de la vitesse de rotation du moteur et en ce que le redresseur 4 prévu entre le filtre passe-bande 3 et le comparateur 7 est remplacé par un organe de temporisation 1n agissant comme un élément monostable redéclenchable qui est placé à la suite du comparateur.This problem is solved according to the invention in that the band eliminating filter 5 is arranged so as to allow the knocking frequency fl to pass, and to dampen all the frequencies situated below a low frequency lower than the knocking frequency fK, and above a high frequency f greater than the knocking frequency
o ment fK, in that there is provided a processing device according to the speed of rotation 11, which processes the reference signal UR with a factor depending on the speed of rotation of the motor and in that the rectifier 4 provided between the bandpass filter 3 and the comparator 7 is replaced by a timing member 1n acting as a re-triggerable monostable element which is placed after the comparator.

D'autres avantages et caractéristiques de l'invention seront mis en évidence dans la suite de la description, donnée à titre d'exemple non limitatif, en référence au dessin unique annexé qui donne un schéma synoptique du dispositif. Other advantages and characteristics of the invention will be highlighted in the following description, given by way of nonlimiting example, with reference to the single appended drawing which gives a block diagram of the device.

Sur le dessin, où les éléments conformes à l'invention sont mis en évidence par des traits plus forts, on peut voir le capteur d'accélération 1 pourvu de l'amplificateur d'entrée 2, le filtre passe-bande 3, le filtre éliminateur de bande 5, le redresseur de valeur efficace 6a avec l'amplificateur 6b et le comparateur 7, ces composants ayant déjà été décrits dans la -demande de brevet principal 80 125C5. Avec un tel agencement, il peut arriver que des bruits de basse fréquence, mais cependant également des armoniques superieures accentuées de la fréquence de cognement fK et des signaux parasites engendrés par la résonance propre du capteur d'accélération 1, franchissent le filtre éliminateur de bande et exercent une influence sur le signal de référence UR.Pour cette raison, le filtre éliminateur de bande est encé, conformément à la présente invention de manière à laisser passer la fréquence de cognement fK, et à amortir toutes les fréquences situées en dessous d'une fréquence inférieure fU approximativement 1 kHz - et audessus dlune fréquence supérieure f - approximativernent 2f.  In the drawing, where the elements in accordance with the invention are highlighted by stronger lines, one can see the acceleration sensor 1 provided with the input amplifier 2, the bandpass filter 3, the filter band eliminator 5, the effective value rectifier 6a with the amplifier 6b and the comparator 7, these components having already been described in the main patent application 80 125C5. With such an arrangement, it may happen that low frequency noises, but also also higher harmonics accentuated by the knock frequency fK and spurious signals generated by the natural resonance of the acceleration sensor 1, pass through the band eliminator filter and exert an influence on the reference signal UR. For this reason, the band eliminating filter is inked, in accordance with the present invention so as to allow the knocking frequency fK to pass, and to damp all the frequencies situated below a lower frequency fU approximately 1 kHz - and above a higher frequency f - approximately 2f.

Une autre perturbation peut être causée par une augmentation de plus en plus forte du signal de référence avec la vitesse de rotation du moteur, ce qui conduit à une réduction de sensibilité du fait d'une diminution de la différence d'amplitude entre le signal de cognement et le signal de référence. Pour cette raison, il est prévu entre le filtre éliminateur de bande 5 et le redresseur de valeur efficace 6a un dispositif de traitement en fonction de la vitesse de rotation 11, qui se compose d'un organe de temporisation monostable commandé par l'installation d'allumage 12 et qui, à chaque allumage, court-circuite l'entrée du redresseur 6a pendant un intervalle de temps constant TD qui est par exemple de 2 ms.Le signal de référence UR produit par le redresseur de valeur efficace 6a diminue alors quand la vitesse de rotation crott, c'est-à-dire que, aux basses vitesses de rotation, il se produit une correction qui n'entre pratiquement pas en ligne de compte tandis que, pour la vitesse de rotation maximale, le signal de référence diminue par exemple du facteur 2. Another disturbance can be caused by an increasing increase in the reference signal with the rotation speed of the motor, which leads to a reduction in sensitivity due to a decrease in the difference in amplitude between the signal of knock and the reference signal. For this reason, there is provided between the band eliminating filter 5 and the effective value rectifier 6a a device for processing as a function of the speed of rotation 11, which is composed of a monostable timing member controlled by the installation of ignition 12 and which, on each ignition, short-circuits the input of rectifier 6a during a constant time interval TD which is for example 2 ms. The reference signal UR produced by the effective value rectifier 6a then decreases when the speed of rotation crott, that is to say that, at low speeds of rotation, there is a correction which is practically not taken into account while for the maximum speed of rotation, the reference signal decreases for example by factor 2.

Dans le dispositif déjà proposé, le signal de co liement établi par le filtre passe-bande 3 était redressé avait le comparateur 7. il en résultait que des séquences d'impulsions très élevées et courtes pouvaient engendrer à l'entrée du comparateur le même signal que des séquences d'impulsiolls moins élevées et longues, telles que celles qui sont caractéristiques d'un cognement de moteur. In the device already proposed, the binding signal established by the bandpass filter 3 was rectified by the comparator 7. as a result, very high and short pulse sequences could generate the same signal at the input of the comparator. than lower and longer pulse sequences, such as those characteristic of motor knock.

Selon l'invention, le redresseur intervenant dans la demande de brevet principal est maintenant remplacé, dans l'exemple de réalisation, par un élément monostable redéclen ctlable 1O à la sortie du comparateur. En conséquence, chaque impulsion Ux; qui dépasse le signal de référence UR, produit à la sortie du comparateur une impulsion qui est convertie par l'élément monostable redéclenchable en une impulsion d'une durée déterminée, par exemple Tu qu 3/2. 1/f. . Chaque nouvelle impulsion assure à nouveau l'activation de l'élément monostable de sorte que des séquences d'impulsions rapides appliquées à l'entrée de l'élément monostable produisent à sa sortie une longue impulsion unique.De cette manière, de courtes séquences d'impulsions peuvent être mieux différenciées de longues séquences d'impulsions, ctest-à-dire des signaux de cognement proprement dits. La reconnaissance d'un signal de cognement, et la génération du signal de régulation en résultant, peuvent être effectuées de la manière déjà décrite dans la demande de brevet principal 80 12505. According to the invention, the rectifier involved in the main patent application is now replaced, in the exemplary embodiment, by a monostable element retriggered ctlable 1O at the output of the comparator. Consequently, each pulse Ux; which exceeds the reference signal UR, produces at the output of the comparator a pulse which is converted by the re-triggerable monostable element into a pulse of a determined duration, for example Tu qu 3/2. 1 / f. . Each new pulse again activates the monostable element so that rapid pulse sequences applied to the input of the monostable element produce a single long pulse at its output. In this way, short sequences of Pulses can be better differentiated from long sequences of pulses, that is, knock signals themselves. The recognition of a knock signal, and the generation of the resulting regulation signal, can be carried out in the manner already described in main patent application 80 12505.

Un traitement du signal de référence en fonction de la vitesse de rotation pourrait également être effectué en utilisant le signal de vitesse provenant de l'installation d'allumage 12 comme signal de commande d'une modification du gain de l'amplificateur 6b venant à la suite du redresser de valeur efficace 6a, ce qui a été mis en évidence sur le dessin par des lignes en trait interrompu. A processing of the reference signal as a function of the speed of rotation could also be carried out by using the speed signal coming from the ignition installation 12 as a control signal for a modification of the gain of the amplifier 6b coming to the following the effective value rectifier 6a, which has been highlighted in the drawing by dashed lines.

L'organe de temporisation 1O peut également être constitué par un circuit de comptage numérique, qui compte le ombre d'impulsons successives de sortie du comparateur 7 et qui produit un signal en relation avec ce nombre.  The timing device 10 can also be constituted by a digital counting circuit, which counts the shadow of successive pulses of output from comparator 7 and which produces a signal in relation to this number.

L'avantage de l'invention consiste en ce que, par comparaison de chaque impulsion individuelle franchissant le filtre passe-bande avec un signal de référence amélioré, il est possible, par un"redressement numérique " ultérieur, d'une part de mieux éliminer par filtrage un signal parasite et d'autre part de pouvoir différencier de façon plus précise des signaux de cognement par rapport aux signaux parasites résiduels, ce qui contribue au total à améliorer sensiblement la régulation du moteur.  The advantage of the invention consists in that, by comparison of each individual pulse crossing the bandpass filter with an improved reference signal, it is possible, by a subsequent "digital rectification", on the one hand to better eliminate by filtering a parasitic signal and on the other hand to be able to differentiate more precisely knock signals with respect to the residual parasitic signals, which contributes in total to appreciably improving the regulation of the engine.

Claims (3)

REVENDICATIONS 1. Dispositif pour la reconnaissance d'allures indésirables de combustion dans des moteurs à combustion interne à allumage extérieur, au moyen d'un capteur d'accé- lératioii et d'lm filtre passe-bande accordé sur la fréquence de cogner.1ent du moteur, doliez b. grandeur de sortie est comparée à une valeur de référence et dans lequel le résultat de la comparaison est lié aux allures indésirables e combustion à reconnattre dispositif dans lequel le signal acoustique par conduction qui est reçu par le capteur d'accé aération et qui traverse le filtre passe-bande est redressé par un redresseur en un signal à la fréquence de cognement, dans lequel en outre il est prévu un montage en série dtun filtre éliminateur de bande accordé sir la fréquence de cognement, d'un redresse1lr de valeur efficace et d'un amplificateur par lequel le signal acoustique reçu par le capteur d'accélération est converti en un signal de référence, et dans lequel enfin il est prévu un comparateur qui compare le signal de référence avec le signal de cognement et qui produit à sa sortie un signal lorsque le signal de cognement dépasse le signal de référence, conformément à la demande de brevet principal 3O 125C5, dispositif caracterisé en ce tee le filtre éliminateur de bande (5) est agencé de manière à laisser passer la fréquence de cognement (fH), et à amortir toutes les fréquences situées en dessous d'une basse fréquence (fu) ) inférieure à la fréquence de cognement (fI) et au-dessus d'une haute fréquence (fc) supérieure à la fréquence de cocognement (f), en ce qu'il est prévu un dispositif de traite- ment en fonction de la vitesse de rotation (11) qui traite le signal de référence (UR) avec un facteur fonction de la vitesse de rotation du moteur et en ce que le redresseur (4) prévu entre le filtre passe-bande (3) et le comparateur (7) est remplacé par un organe de temporisation (ir) agissant comme un élément monos table redéclenchable qui est placé à la suite du comparateur. 1. Device for recognizing undesirable combustion stages in internal combustion engines with external ignition, by means of an acceleration sensor and a bandpass filter tuned to the frequency of knocking. engine, bole b. output quantity is compared with a reference value and in which the result of the comparison is linked to the undesirable stages of combustion to be recognized device in which the acoustic signal by conduction which is received by the acceleration sensor and which passes through the filter bandpass is rectified by a rectifier into a signal at the knock frequency, in which, in addition, there is provided a series connection of a band eliminator filter tuned to the knock frequency, of a rectifier of effective value and an amplifier by which the acoustic signal received by the acceleration sensor is converted into a reference signal, and in which finally a comparator is provided which compares the reference signal with the knock signal and which produces at its output a signal when the knock signal exceeds the reference signal, in accordance with the main patent application 3O 125C5, device characterized in this tee the band eliminator filter e (5) is arranged so as to allow the knocking frequency (fH) to pass, and to damp all the frequencies situated below a low frequency (fu)) below the knocking frequency (fI) and above of a high frequency (fc) greater than the co-knocking frequency (f), in that there is provided a processing device as a function of the speed of rotation (11) which processes the reference signal (UR) with a factor depending on the speed of rotation of the motor and in that the rectifier (4) provided between the band-pass filter (3) and the comparator (7) is replaced by a delay member (ir) acting as an element monos re-triggerable table which is placed after the comparator. 2. Dispositif selon la revendication 1, carac térisé en ce que le dispositif de traitement en fonction de la vitesse de rotation (11) est constitué par un organe de temporisation monostable commandé par un signal- d'allumage et qui, après chaque allumage, court-circuite pendant un temps défini l'entrée du redresseur de valeur efficace (boa)  2. Device according to claim 1, charac terized in that the device for processing as a function of the speed of rotation (11) consists of a monostable delay member controlled by an ignition signal and which, after each ignition, short-circuits for a defined time the input of the effective value rectifier (boa) 3. Dispositif selon la revendication 1, caractérisé en ce que le dispositif de traitement en fonction de la vitesse de rotation (11) a une influence sur le gain de l'amplificateur (6b).  3. Device according to claim 1, characterized in that the processing device as a function of the speed of rotation (11) has an influence on the gain of the amplifier (6b).
FR8122049A 1979-06-07 1981-11-25 Anti-knock ignition control circuit for IC engine - uses filter circuits and timing monostable to reject disturbances not caused by knocking Granted FR2494770A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2923056A DE2923056C2 (en) 1979-06-07 1979-06-07 Device for recognizing undesired combustion processes in externally ignited internal combustion engines
DE19803044745 DE3044745A1 (en) 1980-11-27 1980-11-27 "DEVICE FOR DETECTING UNWANTED COMBUSTION PROCESSES IN EXTERNAL IGNITION ENGINES"

Publications (2)

Publication Number Publication Date
FR2494770A2 true FR2494770A2 (en) 1982-05-28
FR2494770B2 FR2494770B2 (en) 1983-12-23

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FR8122049A Granted FR2494770A2 (en) 1979-06-07 1981-11-25 Anti-knock ignition control circuit for IC engine - uses filter circuits and timing monostable to reject disturbances not caused by knocking

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554235A1 (en) * 1983-10-27 1985-05-03 Daimler Benz Ag METHOD FOR DETECTING CYLINDERS OPERATING WITH IRREGULAR COMBUSTION IN AN INTERNAL COMBUSTION ENGINE AND DEVICE FOR CARRYING OUT SAID METHOD

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063377A5 (en) * 1969-10-13 1971-07-09 Mobil Oil France
US3822583A (en) * 1972-11-30 1974-07-09 Standard Oil Co Method for determining octane ratings of fuels under road conditions
US4002155A (en) * 1976-01-12 1977-01-11 General Motors Corporation Engine and engine spark timing control with knock limiting etc.
US4106447A (en) * 1977-04-22 1978-08-15 General Motors Corporation Engine spark timing system with retard means and minimum burn timer
GB2009406A (en) * 1977-12-06 1979-06-13 Snam Progetti Detecting knocking in an engine
FR2425059A1 (en) * 1978-05-01 1979-11-30 Nissan Motor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063377A5 (en) * 1969-10-13 1971-07-09 Mobil Oil France
US3822583A (en) * 1972-11-30 1974-07-09 Standard Oil Co Method for determining octane ratings of fuels under road conditions
US4002155A (en) * 1976-01-12 1977-01-11 General Motors Corporation Engine and engine spark timing control with knock limiting etc.
US4106447A (en) * 1977-04-22 1978-08-15 General Motors Corporation Engine spark timing system with retard means and minimum burn timer
GB2009406A (en) * 1977-12-06 1979-06-13 Snam Progetti Detecting knocking in an engine
FR2411399A1 (en) * 1977-12-06 1979-07-06 Snam Progetti AUTOMATIC SYSTEM TO REMOVE BACKGROUND NOISE IN AN APPLIANCE FOR MEASURING COGNING IN INTERNAL COMBUSTION ENGINES
FR2425059A1 (en) * 1978-05-01 1979-11-30 Nissan Motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2554235A1 (en) * 1983-10-27 1985-05-03 Daimler Benz Ag METHOD FOR DETECTING CYLINDERS OPERATING WITH IRREGULAR COMBUSTION IN AN INTERNAL COMBUSTION ENGINE AND DEVICE FOR CARRYING OUT SAID METHOD

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Publication number Publication date
FR2494770B2 (en) 1983-12-23

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