EP0150642B1 - Detection device for the rotation angle of a spinning gear - Google Patents

Detection device for the rotation angle of a spinning gear Download PDF

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Publication number
EP0150642B1
EP0150642B1 EP19840402576 EP84402576A EP0150642B1 EP 0150642 B1 EP0150642 B1 EP 0150642B1 EP 19840402576 EP19840402576 EP 19840402576 EP 84402576 A EP84402576 A EP 84402576A EP 0150642 B1 EP0150642 B1 EP 0150642B1
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EP
European Patent Office
Prior art keywords
duration
counter
teeth
signal
counting
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.)
Expired
Application number
EP19840402576
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German (de)
French (fr)
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EP0150642A3 (en
EP0150642A2 (en
Inventor
Patrick Herbault
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
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Publication of EP0150642A3 publication Critical patent/EP0150642A3/en
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    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
    • F02P7/0675—Electromagnetic pick-up devices, e.g. providing induced current in a coil with variable reluctance, e.g. depending on the shape of a tooth
    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/077—Circuits therefor, e.g. pulse generators
    • F02P7/0775—Electronical verniers

Definitions

  • the electronic control devices associated with a part driven in a rotational movement require the knowledge of two pieces of information, the speed of rotation of the part and a reference mark.
  • One of these devices comprises a reluctance sensor placed opposite the teeth of the crown of the flywheel of the engine, at least one of the teeth having a discontinuity, either of shape, or of material or else, being missing.
  • the sensor then theoretically provides a periodic signal which, after shaping, consists of (N - 1) regular slots and a slot having a width discontinuity, N being the number of teeth of the crown.
  • the subject of the present invention is a device for locating the angular position of a rotating part provided with teeth, at least one of which has a magnetic singularity while the other teeth are identical, which comprises a sensor arranged near the teeth and suitable for providing a signal in slots, means for measuring the duration of a slot corresponding to the passage of a tooth in front of the sensor, and an initializable downcounting means which remedies these drawbacks.
  • the document US-A-3,930,201 describes a tracking device of this type which measures the difference between the duration of a slot and that of the next dip; if this difference is greater than a given fixed threshold, it is considered that the singular tooth has just passed in front of the sensor. But this device requires a singular tooth of a very particular geometry.
  • the present invention relates to a locating device with which the geometry of the singular tooth can be arbitrary provided that it introduces a slot of different duration.
  • This device is characterized in that it further comprises means for measuring the difference between the duration of passage of a slot and the duration of passage of the previous slot, means for comparing this difference in duration with a difference in duration previously storage, means for storing the new difference in duration and resetting the tooth counting means if the comparison gives a positive result, means for decrementing the tooth counting means by one unit otherwise, and means controlled by the tooth counting means when it reaches zero for resetting the tooth counting means and the memory and outputting an output signal.
  • the means for measuring the duration of a slot as well as the difference between this duration and the duration of the preceding slot include a clock, a counter for counting the number of clock pulses during each slot, a down counter previously loaded during the measurement of the duration of the passage of the previous slot and counting the clock pulses at the same time as the counter counts, and means for transferring the contents of the counter into the down counter after each measurement of the duration of a slot.
  • a crown 1 which is fixed for example on the flywheel of an internal combustion engine.
  • the crown 1 has, on its periphery, N teeth 2 regularly distributed.
  • the teeth have a singularity, one or more teeth having been modified, as indicated in 2a in Figure 1, or even deleted ( Figure 2).
  • an inductive sensor 4 which comprises a coil 5 and in front of which the teeth 2 pass one after the other by inducing in the coil 5 half waves of alternating voltage and of sinusoidal shape 6 (see Figure 3 ).
  • an inductive sensor 4 which comprises a coil 5 and in front of which the teeth 2 pass one after the other by inducing in the coil 5 half waves of alternating voltage and of sinusoidal shape 6 (see Figure 3 ).
  • After shaping we theoretically obtain a periodic signal formed by at most N -1 regular slots 7 and at least one slot 7a having a width discontinuity ( Figure 3).
  • the passage of the singularity 3 in front of the probe 4, detected by the slot 7a having a width discontinuity constitutes the calibration reference and the number of passages of
  • the signals coming from the sensor 2 are shaped in a known device 8.
  • This transmits the toothed signal in slots 7 to an ignition control circuit 9 of known type which comprises for example a micro-processor of the Motorola 6805 type and which calculates the ignition advance so as to trigger the ignition as a function of the stall and the depression of the engine.
  • the shaped toothing signal is also transmitted from the locating circuit 10, which sends a reference signal to the circuit 9. The latter also receives, by means of a shaping circuit 11, information on the engine vacuum, supplied by a vacuum sensor 12.
  • the circuit 9 determines by means of this information the ignition advance and the ignition moment and then supplies the bases of transistors T 1 , T 2 with the polarization necessary for their on state, this state controlling the coils of induction 13a or 13b delivering the energy necessary for the spark plugs 14a or 14b.
  • circuits 9 and 10 form an assembly 15 which can be produced in different ways without departing from the scope of the invention.
  • the element 15 is essentially composed of a reference measurement device 16 which receives at 17 the toothing signals formed in the circuit 8 and transmits to a slot counter 18 by the link 19 of the signals " teeth "and, by the way 20 reference information.
  • the slot counter 18 working as a down-counter, transmits, when it reaches zero, to the reference measurement device 16, via channel 21, a reset signal allowing the loading of the reference value into memory, and, at the same time, transmits to the circuit 9, via a flip-flop 22 the synchronization signal which allows the device 9 to control by its outputs 23 and 24 the transistors T, and T 2 .
  • FIG. 7 shows a simplification of the device of FIG. 6.
  • the assembly 15 now only includes the reference measurement device 16 and the circuit 9.
  • the circuit 16 receives at 17 the shaped teeth signals and transfers the "tooth" signal to the timer input used in the event counter of circuit 9, as well as the reference information supplemented by the IRQ input of this circuit 9; the latter transmits the "clear" initialization information to it via channel 21.
  • Figure 9 is a detailed representation of the tracking circuit 10 for obtaining an adaptive criterion continuously updated.
  • This circuit includes a shaping circuit receiving at 26 the sinusoidal toothing signals and composed of two triggers inverters placed in series 27 and 28 which attack the "data" input 29 of a shift register 30 to 8 bits of the type MM 74c164, as well as a clock produced conventionally by inverting gates 31 and 32, a resistor 33 and a capacitor 34 and which delivers its pulses to an output 35 connected to circuit 9, by means of an inverting gate 36, and to the shift register 30 on its "clock” input 37, by means of an inverting gate 38.
  • the clock provides a signal whose frequency is large compared to that of the toothing signal as shown in FIG. 10 in which we see at 7 the shaped toothing signal and at 39 the clock signal.
  • the shift register 30 comprises a series of flip-flops each associated with one of its outputs.
  • the output Q 1 of this register goes from the low state to the high state during the front edge of the clock pulse which follows, as indicated in 40 in FIG. 11, and remains in the high state until the front edge of the clock pulse following the passage from the high state to the low state of the toothing signal.
  • the signal at output Q 4 of the register indicated at 41 has an analogous form, but offset by the duration of three clock pulses with respect to the signal at output Q 1 .
  • the clock also delivers pulses to one of the inputs of a NON-ET46 gate, the other input of which is connected to output Q 1 of register 30.
  • the output of the NON-ET46 gate is connected to the inputs of clock of a counter 47 and of a prechargeable down counter 48. Under these conditions the counter 47 counts and the down counter 48 counts down when the output Q 1 is in the high state, at each trailing edge of the clock pulse. They stop operating when the output Q 1 returns to the low state, that is to say when the toothing signal 7 returns to the low state.
  • the counter 47 uses the first sixteen bits of two counters, with twelve bits, connected in cascade of the type MCM 14040 and its initialization input is linked to the output of an AND gate 49 of which an input is linked to the output Q 7 shift register 30, via an inverting gate 50 while its other input is linked to the output Q 8 of this register 30.
  • the counter initialization signal is supplied when the output Q 7 of the register goes to zero, as long as output Q 8 is still in state 1, that is to say during a clock pulse. This signal is represented at 51 in FIG. 10.
  • the outputs 0 1 to Q 16 of the counter 47 are linked to the preloading inputs of the 48-bit up-down counter 48 produced by four pre-loadable four-bit up-down counters of the MM 74c193 type, four circuits.
  • Mc 14049 inverters and an additional circuit to make the 17th bit not inverted, preloaded to zero.
  • the downcounter 48 is preloaded by the outputs Q 1 to Q 16 of the counter 47, by the preloading control signal supplied by the output of a NAND gate 52 of which one of the inputs is linked, via d an inverting door 53, at the output Q 5 of the register 30, while its other input is linked to the output 0 6 of this register 30.
  • This control signal which is represented at 54 in FIG. 10, is supplied when the output Q 5 goes to 0, as long as the output Q 6 is still in state 1, that is to say during the clock pulse, four cycles after the falling edge of Q 1 .
  • the down-counter 48 is linked by its inverted outputs Q 1 to 0 16 to the inputs B, to B 16 of a comparator 55. Its output Q 17 is linked to an input of a NAND gate 56 which has its other linked input to an output of comparator 55 giving information A ⁇ B.
  • the output of gate 56 is linked to input D of a flip-flop 57 whose clock input is linked via an inverting gate 58 to the output Q 4 of the shift register 30, to one of the inputs of a NAND gate 59 associated in rocker with a NAND gate 60, and to the loadable slot counter 18, on its input 61 receiving the signal "tooth".
  • the output of the flip-flop 59, 60, giving the loading information is connected to the input 62 of the down-counter 18.
  • the down-counter 48 is linked on the other hand by its outputs Q 1 to Q 16 to the inputs of a memory 63.
  • the comparator 55 has its inputs B, to B 16 linked to the down-counter 48 and its inputs A 1 to A 16 to the sixteen outputs of the memory 63.
  • the memory 63 has its initialization input at zero (clear) linked to the output 64 of the downcounter 18 and its input E 1 , write or store order, linked to the output of an inverting gate 65 inverting the output Q of flip-flop 57 and also connected to one of the inputs of the NAND gate 60.
  • the downcounter 18 is loaded by a wired device 66 giving values 1 or 0 on its inputs defined from the number of teeth N of the toothed ring.
  • the output (carry out) 64 of the down-counter 18 is linked to the flip-flop 22 in connection by its output 67 with the circuit 9.
  • the microprocessor On power up, the microprocessor is initialized and itself, after a short period of time intended for the passage of a few slots, initializes the counter 18 by a conventional device not shown.
  • the two inverscurs 27 and 28 are two triggers giving the toothing signal used by the shift register 30. First, the signal gear changes from low state "0" to high state "1".
  • the output Q 1 of this register 30 changes to "1" and the counter 47 is incremented at the rate of the clock, measuring the duration T f of the slot at state 1, as indicated at 68 in FIG. 3.
  • the down-counter 48 preloaded with the value T i-1 of the duration of the preceding slot, counts down to the rhythm of the clock (see at 69 in FIG. 3).
  • the down counter 48 contains the difference T i-1 - T i between the duration of the previous slot and that of the slot being measured. If the value T; is greater than the value T i-1 then the output Q 17 of the down-counter 48 goes to 1 when its outputs Q 1 Vietnamese Q 16 go to zero, as indicated in 70 in Figure 3.
  • the toothing signal 7 goes from state 1 to state zero.
  • the shift register 30 provides, through the gates associated with it, various time-shifted synchronization signals the form and effects of which will be examined later.
  • the comparator 55 gives the information of the comparison between the difference T i - T i-1 and the difference stored in the memory 63.
  • the result of the comparison associated with the sign condition on the output Q 17 of the down-counter 48 in the NAND gate 56 whose output is linked to the input D of the flip-flop 57 is sampled by the latter three cycles after the falling edge of Q 1 to take account of the stabilization of the comparator, l the interval of three cycles being due to the fact that the clock input of the flip-flop 57 is connected to the output Q 4 of the register 30.
  • test result is positive, i.e. if T; is greater than T i-1 and if the difference T i - T i- 1 is greater than the value stored in memory, the difference T i - T i-1 is immediately loaded into memory 63 by the signal inverted by the inverter 65, sampled and shown at 71 in Figures 3 and 10; the flip-flop is reset to 1, half a clock cycle after, by the clear input connected to the reference clock.
  • This signal 71 triggers the flip-flop 59, 60 which sends to the down counter 18 a reference signal 72 (see FIGS. 3 and 10) ensuring the recharging of the down counter 18.
  • the value T; contained in the counter 47 is transferred to the down-counter 48 by controlling the signal supplied by the NAND gate 52 which is a top of a clock cycle shifted by four cycles relative to the falling edge of 0 1 , since 'it is triggered by the change to 0 of output Q 5 of register 30.
  • the counter 47 is reset to zero by controlling the signal supplied by the gate 49 which is a top of a clock cycle, offset by six cycles relative to the falling edge of Q 1 .
  • the entire circuit is then ready to carry out the measurement of the next slot.
  • the difference T i - T i - 1 is less than the value put in the memory 63, the content of this memory is preserved and the flip-flop 59 - 60 is not triggered so that the down-counter 18 is not reloaded .
  • the outgoing signal at Q 4 decreases the content of the down counter by one.
  • the toothing signal again changes from state 0 to state 1 and the next slot is checked.
  • the carry signal emitted at 64 and represented at 73 in FIG. 10, triggers on the one hand the output signal 67 after shaping by an appropriate circuit 22 known per se and on the other hand resets the memory 63; it is therefore an initialization signal.
  • the memory 63 is at zero; the comparator 55 therefore indicates that the value of the down-counter is higher and the loading is therefore carried out normally, if the sign bit on the output Q 17 of the down-counter 48 is respected. This thus increases the safety of the device and also allows very interesting operation in the particular case of a tooth whose flux is reduced by modification of shape or material.
  • Figure 11 shows the signal formed by the sensor at low speed (solid line 6a) and at high speed (dotted line 6b).
  • the initialization signal always takes place for the slot T ' 2 because the difference T' 2 - T ' o is taken into account.
  • the realization of the device can be a specific circuit because the invention is particularly well suited to digital integration.
  • the solution is particularly economical; the integrated circuit no longer represents than a few square millimeters of silicon implanted in an eight-pin plastic case (clock in, clock out, tooth in, mass, power supply, tooth out, reference, clear).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

Les dispositifs de commande électronique associés à une pièce animée d'un mouvement de rotation nécessitent la connaissance de deux informations, la vitesse de rotation de la pièce et un repère de référence.The electronic control devices associated with a part driven in a rotational movement require the knowledge of two pieces of information, the speed of rotation of the part and a reference mark.

C'est ainsi que, dans le domaine automobile, il existe des dis positifs assurant l'allumage électronique, en déterminant l'avance à l'allumage et l'instant d'allumage, en fonction essentiellement de la vitesse de rotation du moteur et d'une référence de calage, c'est-à-dire l'instant où un endroit précis de la périphérie de l'arbre-moteur passe devant un repère fixe.Thus, in the automotive field, there are positive devices ensuring electronic ignition, by determining the ignition advance and the ignition instant, essentially as a function of the engine rotation speed and a timing reference, that is to say the instant when a precise location on the periphery of the motor shaft passes in front of a fixed reference.

On connaît des dispositifs de commande utilisant deux capteurs fournissant l'un l'information "référence de calage" et l'autre l'information "vitesse de rotation".There are known control devices using two sensors, one providing the “stall reference” information and the other “rotation speed” information.

Dans un but de simplification et de diminution du prix de revient, on a proposé des dispositifs qui n'utilisent qu'un seul capteur fournissant à la fois les deux informations.In order to simplify and reduce the cost price, devices have been proposed which use only one sensor providing both information at the same time.

L'un de ces dispositifs comporte un capteur à réluctance placé en regard des dents de la couronne du volant du moteur, l'une des dents au moins présentant une discontinuité, soit de forme, soit de matière ou encore, étant manquante. Le capteur fournit alors théoriquement un signal périodique qui, après mise en forme, est constitué de (N - 1) créneaux réguliers et d'un créneau présentant une discontinuité de largeur, N étant le nombre de dents de la couronne.One of these devices comprises a reluctance sensor placed opposite the teeth of the crown of the flywheel of the engine, at least one of the teeth having a discontinuity, either of shape, or of material or else, being missing. The sensor then theoretically provides a periodic signal which, after shaping, consists of (N - 1) regular slots and a slot having a width discontinuity, N being the number of teeth of the crown.

Mais l'expérience montre que l'application de ce dispositif pour assurer l'allumage électronique dans un véhicule présente de nombreuses difficultés dues notamment au fait que les créneaux dits réguliers ne le sont qu'imparfaitement, car la vitesse de rotation d'un moteur n'est pas uniforme; pendant un démarrage à froid, il peut y avoir de très grandes variations dans la valeur de la vitesse instantanée. La couronne tournante peut présenter un faux rond qui perturbe le signal. Enfin le circuit de mise en forme du signal peut entraîner des perturbations, en particulier dans le cas où il existe une horloge asynchrone d'échantillonnage.However, experience shows that the application of this device to ensure electronic ignition in a vehicle presents many difficulties due in particular to the fact that the so-called regular slots are only imperfectly so, because the speed of rotation of an engine is not uniform; during a cold start, there can be very large variations in the value of the instantaneous speed. The rotating crown may have a false circle which disturbs the signal. Finally, the signal shaping circuit can cause disturbances, in particular in the case where there is an asynchronous sampling clock.

La présente invention a pour objet un dispositif de repérage de la position angulaire d'une pièce tournante munie de dents dont au moins une présente une singularité magnétique alors que les autres dents sont identiques, qui comprend un capteur disposé à proximité des dents et propre à fournir un signal en créneaux, des moyens pour mesurer la durée d'un créneau correspondant au passage d'une dent devant le capteur, et un moyen de décomptage initialisable qui remédie à ces inconvénients.The subject of the present invention is a device for locating the angular position of a rotating part provided with teeth, at least one of which has a magnetic singularity while the other teeth are identical, which comprises a sensor arranged near the teeth and suitable for providing a signal in slots, means for measuring the duration of a slot corresponding to the passage of a tooth in front of the sensor, and an initializable downcounting means which remedies these drawbacks.

Le document US-A-3 930 201 décrit un dispositif de repérage de ce type qui mesure la différence entre la durée d'un créneau et celle du creux suivant; si cette différence est supérieure à un seuil donné fixe, il est considéré que la dent singulière vient de passer devant le capteur. Mais ce dispositif exige une dent singulière d'une géométrie bien particulière.The document US-A-3,930,201 describes a tracking device of this type which measures the difference between the duration of a slot and that of the next dip; if this difference is greater than a given fixed threshold, it is considered that the singular tooth has just passed in front of the sensor. But this device requires a singular tooth of a very particular geometry.

La présente invention a pour objet un dispositif de repérage avec lequel la géométrie de la dent singulière peut être quelconque pourvu qu'elle introduise un créneau de durée différente.The present invention relates to a locating device with which the geometry of the singular tooth can be arbitrary provided that it introduces a slot of different duration.

Ce dispositif est caractérisé en ce qu'il comprend en outre des moyens pour mesurer la différence entre la durée de passage d'un créneau et la durée de passage du créneau précédént, un moyen pour comparer cette différence de durée avec une différence de durée préalablement mise en mémoire, des moyens pour mettre en mémoire la nouvelle différence de durée et réinitialiser le moyen de décomptage des dents si la comparaison donne un résultat positif, des moyens pour décrémenter le moyen de décomptage des dents d'une unité dans le cas contraire, et des moyens commandés par le moyen de décomptage des dents lorsqu'il arrive à zéro pour réinitialiser le moyen de décomptage des dents et la mémoire et émettre un signal de sortie.This device is characterized in that it further comprises means for measuring the difference between the duration of passage of a slot and the duration of passage of the previous slot, means for comparing this difference in duration with a difference in duration previously storage, means for storing the new difference in duration and resetting the tooth counting means if the comparison gives a positive result, means for decrementing the tooth counting means by one unit otherwise, and means controlled by the tooth counting means when it reaches zero for resetting the tooth counting means and the memory and outputting an output signal.

Dans un mode de réalisation préféré de l'invention, les moyens pour mesurer la durée d'un créneau ainsi que la différence entre cette durée et la durée du créneau précédént comprennent une horloge, un compteur pour compter le nombre d'impulsions d'horloge durant chaque créneau, un décompteur préalablement chargé pendant la mesure de la durée de passage du créneau précédént et décomptant les impulsions d'horloge en même temps que le compteur compte, et des moyens pour transférer le contenu du compteur dans le décompteur après chaque mesure de la durée d'un créneau.In a preferred embodiment of the invention, the means for measuring the duration of a slot as well as the difference between this duration and the duration of the preceding slot include a clock, a counter for counting the number of clock pulses during each slot, a down counter previously loaded during the measurement of the duration of the passage of the previous slot and counting the clock pulses at the same time as the counter counts, and means for transferring the contents of the counter into the down counter after each measurement of the duration of a slot.

On a décrit ci-après, à titre d'exemple non limitatif, un mode de réalisation du dispositif selon l'invention, avec référence aux dessins annexés dans lesquels:

  • La Figure 1 est une vue en élévation montrant une partie d'une couronne dentée présentant une dent singulière et mobile devant un capteur;
  • La Figure 2 montre une variante de la Figure 1 ;
  • La Figure 3 montre divers signaux, la denture étant représentée développée.
  • La Figure 4 est un logigramme de fonctionnement du dispositif selon l'invention.
  • La Figure 5 est un schéma d'un dispositif d'allumage du type électronique intégral et comportant le dispositif selon l'invention.
  • La Figure 6 est un schéma représentant un premier mode de réalisation du dispositif selon l'invention.
  • La Figure 7 est un schéma représentant un deuxième mode de réalisation du dispositif selon l'invention.
  • La Figure 8 est un schéma représentant un troisième mode de réalisation du dispositif selon l'invention.
  • La Figure 9 est un schéma détaillé du premier mode de réalisation du dispositif.
  • La Figure 10 montre une partie du signal de denture et divers signaux qui lui sont associés.
  • La Figure 11 montre, avant mise en forme, un signal de denture à basse vitesse et à grande vitesse.
  • La Figure 12 montre, après mise en forme, le signal de denture à basse vitesse, ainsi que le signal d'initialisation et le signal de référence correspondant.
  • La Figure 13 montre, après mise en forme, le signal de denture à grande vitesse, ainsi que le signal d'initialisation et le signal de référence correspondant.
An embodiment of the device according to the invention has been described below, by way of nonlimiting example, with reference to the appended drawings in which:
  • Figure 1 is an elevational view showing part of a ring gear having a singular tooth and movable in front of a sensor;
  • Figure 2 shows a variant of Figure 1;
  • Figure 3 shows various signals, the teeth being shown developed.
  • Figure 4 is an operating flow diagram of the device according to the invention.
  • Figure 5 is a diagram of an ignition device of the integral electronic type and comprising the device according to the invention.
  • Figure 6 is a diagram showing a first embodiment of the device according to the invention.
  • Figure 7 is a diagram showing a second embodiment of the device according to the invention.
  • Figure 8 is a diagram showing a third embodiment of the device according to the invention.
  • Figure 9 is a detailed diagram of the first embodiment of the device.
  • Figure 10 shows part of the signal toothing and various signals associated with it.
  • Figure 11 shows, before shaping, a low speed and high speed toothing signal.
  • Figure 12 shows, after shaping, the low speed toothing signal, as well as the initialization signal and the corresponding reference signal.
  • Figure 13 shows, after shaping, the high speed toothing signal, as well as the initialization signal and the corresponding reference signal.

Aux Figures 1 et 2, on voit une couronne 1, qui est fixée par exemple sur le volant d'un moteur à combustion interne. La couronne 1 comporte, sur sa périphérie, N dents 2 régulièrement réparties. Dans une zone donnée 3, la denture présente une singularité, une ou plusieurs dents ayant été modifiées, comme indiqué en 2a à la Figure 1, ou même supprimées (Figure 2). A proximité de la denture est disposé un capteur inductif 4 qui comporte une bobine 5 et devant lequel les dents 2 passent les unes après les autres en induisant dans la bobine 5 des demi-ondes de tension alternatives et de forme sinusoïdale 6 (voir Figure 3). Après mise en forme, on obtient théoriquement un signal périodique formé de au plus N -1 créneaux réguliers 7 et d'au moins un créneau 7a présentant une discontinuité de largeur (Figure 3). Le passage de la singularité 3 devant le palpeur 4, détecté par le créneau 7a présentant une discontinuité de largeur, constitue la référence de calage et le nombre de passages de cette singularité devant le palpeur pendant l'unité de temps représente la vitesse de rotation de la couronne 1.In Figures 1 and 2, we see a crown 1, which is fixed for example on the flywheel of an internal combustion engine. The crown 1 has, on its periphery, N teeth 2 regularly distributed. In a given area 3, the teeth have a singularity, one or more teeth having been modified, as indicated in 2a in Figure 1, or even deleted (Figure 2). Near the teeth is arranged an inductive sensor 4 which comprises a coil 5 and in front of which the teeth 2 pass one after the other by inducing in the coil 5 half waves of alternating voltage and of sinusoidal shape 6 (see Figure 3 ). After shaping, we theoretically obtain a periodic signal formed by at most N -1 regular slots 7 and at least one slot 7a having a width discontinuity (Figure 3). The passage of the singularity 3 in front of the probe 4, detected by the slot 7a having a width discontinuity, constitutes the calibration reference and the number of passages of this singularity in front of the probe during the unit of time represents the speed of rotation of crown 1.

Pour détecter le créneau 7a présentant une discontinuité de largeur, on mesure la différence entre la durée T; d'un créneau et la durée Ti-1 du créneau précèdent et on compare cette différence Δi = Ti - 1, qui est nulle dans le cas de deux créneaux successifs réguliers et d'une vitesse de rotation uniforme, à une valeur Am précédemment mise en mémoire. Si cette différence Δi est supérieure à Am, on remplace dans la mémoire Δm par Δi (Voir Figure 4).To detect the slot 7a having a width discontinuity, the difference between the duration T is measured; of a slot and the duration T i-1 of the slot precede and we compare this difference Δ i = T i - 1 , which is zero in the case of two successive regular slots and of a uniform rotation speed, to a value A m previously stored. If this difference Δ i is greater than A m , we replace in memory Δ m by Δ i (See Figure 4).

Si, au contraire, Δi est inférieure à Am on examine si, depuis la mise en mémoire de Δm, la couronne 1 a fait un tour complet, c'est à-dire si N dents 2 sont passées devant le palpeur 4 en produisant N créneaux, sans qu'une différence A plus élevée ait été trouvée. Dans la négative, on passe au créneau suivant; dans l'affirmative, on émet un signal de référence et, pour rafraîchir la mémoire, on remet la mémoire à zéro.If, on the contrary, Δ i is less than A m, it is examined whether, since the storage of Δ m , the crown 1 has made a complete revolution, that is to say if N teeth 2 have passed in front of the probe 4 by producing N slots, without a higher difference A having been found. If not, we move on to the next slot; in the affirmative, a reference signal is emitted and, to refresh the memory, the memory is reset to zero.

Pour déterminer si la couronne a fait un tour complet, on chargé initialement un décompteur de la valeur N et on décrémente ce décompteur d'une unité à chaque créneau de sorte que l'arrivée à zéro de la valeur de ce décompteur indique que la couronne 1 a fait un tour.To determine whether the crown has made a full revolution, we initially load a down counter of the value N and we decrement this down counter by one at each slot so that the arrival at zero of the value of this down counter indicates that the crown 1 did a lap.

A la Figure 5, les signaux provenant du capteur 2, sont mis en forme dans un dispositif connu 8. Celui-ci transmet le signal de dent ture en créneaux 7 à un circuit de commande d'allumage 9 de type connu qui comprend par exemple un micro-processeur du type Motorola 6805 et qui calcule l'avance à l'allumage de façon à déclencher l'allumage en fonction du calage et de la dépression du moteur. Le signal de denture mis en forme est également transmis du circuit de repérage 10, qui envoie un signal de référence au circuit 9. Celui-ci reçoit, par ailleurs, par l'intermédiaire d'un circuit de mise en forme 11, des informations sur la dépression du moteur, fournies par un capteur à dépression 12.In FIG. 5, the signals coming from the sensor 2 are shaped in a known device 8. This transmits the toothed signal in slots 7 to an ignition control circuit 9 of known type which comprises for example a micro-processor of the Motorola 6805 type and which calculates the ignition advance so as to trigger the ignition as a function of the stall and the depression of the engine. The shaped toothing signal is also transmitted from the locating circuit 10, which sends a reference signal to the circuit 9. The latter also receives, by means of a shaping circuit 11, information on the engine vacuum, supplied by a vacuum sensor 12.

Le circuit 9 détermine au moyen de ces informations l'avance à l'allumage et le moment d'allumage et fournit alors sur les bases de transistors T1, T2 la polarisation nécessaire à leur état passant, cet état commandant les bobines d'induction 13a ou 13b délivrant l'énergie nécessaire aux bougies d'ignition 14a ou 14b.The circuit 9 determines by means of this information the ignition advance and the ignition moment and then supplies the bases of transistors T 1 , T 2 with the polarization necessary for their on state, this state controlling the coils of induction 13a or 13b delivering the energy necessary for the spark plugs 14a or 14b.

Les circuits 9 et 10 forment un ensemble 15 qui peut être réalisé de différentes façons sans pour autant sortir du cadre de l'invention.The circuits 9 and 10 form an assembly 15 which can be produced in different ways without departing from the scope of the invention.

La réalisation de base qui servira à l'explication du fonctionnement est celle représentée à la Figure 6.The basic embodiment which will be used to explain the operation is that shown in Figure 6.

Dans cette figure, l'élément 15 est composé essentiellement d'un dispositif de mesure de référence 16 qui reçoit en 17 les signaux de denture mis en forme dans le circuit 8 et transmet à un compteur de créneaux 18 par la liaison 19 des signaux "dents" et, par la voie 20 une information de référence. Le compteur de créneaux 18 travaillant en décompteur, transmet, lorsqu'il arrive à zéro, au dispositif de mesure de référence 16, par la voie 21, un signal de remise à zéro permettant le chargement de la valeur de référènce en mémoire, et, en même temps, transmet au circuit 9, par l'intermédiaire d'une bascule 22 le signal de synchronisation qui permet au dispositif 9 de commander par ses sorties 23 et 24 les transistors T, et T2.In this figure, the element 15 is essentially composed of a reference measurement device 16 which receives at 17 the toothing signals formed in the circuit 8 and transmits to a slot counter 18 by the link 19 of the signals " teeth "and, by the way 20 reference information. The slot counter 18 working as a down-counter, transmits, when it reaches zero, to the reference measurement device 16, via channel 21, a reset signal allowing the loading of the reference value into memory, and, at the same time, transmits to the circuit 9, via a flip-flop 22 the synchronization signal which allows the device 9 to control by its outputs 23 and 24 the transistors T, and T 2 .

La variante de la figure 7 montre une simplification du dispositif de la figure 6. L'ensemble 15 ne comprend plus que le dispositif de mesure de référence 16 et le circuit 9. Le circuit 16 reçoit en 17 les signaux de denture mis en forme et transfère le signal "dent" à l'entrée timer utilisée en compteur d'évènement du circuit 9, ainsi que l'information référence complémentée à l'entrée IRQ de ce circuit 9; ce dernier lui transmet l'information d'initialisation "clear" par la voie 21.The variant of FIG. 7 shows a simplification of the device of FIG. 6. The assembly 15 now only includes the reference measurement device 16 and the circuit 9. The circuit 16 receives at 17 the shaped teeth signals and transfers the "tooth" signal to the timer input used in the event counter of circuit 9, as well as the reference information supplemented by the IRQ input of this circuit 9; the latter transmits the "clear" initialization information to it via channel 21.

La Figure 8 est la réalisation la plus évoluée. Dans cette dernière, l'ensemble ne comprend plus qu'un micro-processeur 25 (par exemple un Motorola 6801) qui est interrompu à chaque créneau. Le traitement par logiciel de l'interruption consiste à assurer:

  • .1. - Le comptage des créneaux par incrémentation d'un registre.
  • .2. - La mesure des largeurs ou durée des créneaux par la lecture des registres du timer.
  • .3. - La caractéristique adaptive par calcul des différences de largeur ou de durée des créneaux et mémorisation de la plus grande valeur sur un tour. Il n'est pas fourni de signal extérieur de sortie car le micro-processeur peut utiliser directement le registre comptant les créneaux.
Figure 8 is the most advanced embodiment. In the latter, the assembly no longer comprises a microprocessor 25 (for example a Motorola 6801) which is interrupted at each slot. The software processing of the interruption consists in ensuring:
  • .1. - Counting slots by incrementing a register.
  • .2. - The measurement of the widths or duration of the slots by reading the timer registers.
  • .3. - The adaptive characteristic by calculating the differences in width or duration of the slots and memorization of the greatest value on a lap. An external output signal is not provided since the microprocessor can directly use the register counting the slots.

La Figure 9 est une représentation détaillée du circuit de repérage 10 permettant d'obtenir un critère adaptatif continuellement mis à jour.Figure 9 is a detailed representation of the tracking circuit 10 for obtaining an adaptive criterion continuously updated.

Ce circuit comprend un circuit de mise en forme recevant en 26 les signaux sinusoïdaux de denture et composé de deux inverseurs triggers mis en série 27 et 28 qui attaquent l'entrée "data" 29 d'un registre à décalage 30 à 8 bits du type MM 74c164, ainsi qu'une horloge réalisée de façon classique par des portes inverseuses 31 et 32, une résistance 33 et une capacité 34 et qui délivre ses impulsions à une sortie 35 reliée au circuit 9, par l'intermédiaire d'une porte inverseuse 36, et au registre à décalage 30 sur son entrée "clock" 37, par l'intermédiaire d'une porte inverseuse 38.This circuit includes a shaping circuit receiving at 26 the sinusoidal toothing signals and composed of two triggers inverters placed in series 27 and 28 which attack the "data" input 29 of a shift register 30 to 8 bits of the type MM 74c164, as well as a clock produced conventionally by inverting gates 31 and 32, a resistor 33 and a capacitor 34 and which delivers its pulses to an output 35 connected to circuit 9, by means of an inverting gate 36, and to the shift register 30 on its "clock" input 37, by means of an inverting gate 38.

L'horloge fournit un signal dont la fréquence est grande par rapport à celle du signal de denture comme le montre la figure 10 dans laquelle on voit en 7 le signal de denture mis en forme et en 39 le signal d'horloge. Le registre à décalage 30 comporte une série de bascules associées chacune à l'une de ses sorties. Ainsi, lorsque le signal de denture 7 passe de l'état bas à l'état haut, la sortie Q1 de ce registre passe de l'état bas à l'état haut lors du front avant de l'impulsion d'horloge qui suit, comme indiqué en 40 à la Figure 11, et reste à l'état haut jusqu'au front avant de l'impulsion d'horloge suivant le passage de l'état haut à l'état bas du signal de denture. Le signal à la sortie Q4 du registre indiqué en 41 a une forme analogue, mais décalé de la durée de trois impulsions d'horloge par rapport au signal de la sortie Q1. On voit également à la Figure 11 en 42, 43, 44 et 45 les signaux aux sorties Q5, Os, Q7 et Q8.The clock provides a signal whose frequency is large compared to that of the toothing signal as shown in FIG. 10 in which we see at 7 the shaped toothing signal and at 39 the clock signal. The shift register 30 comprises a series of flip-flops each associated with one of its outputs. Thus, when the toothing signal 7 goes from the low state to the high state, the output Q 1 of this register goes from the low state to the high state during the front edge of the clock pulse which follows, as indicated in 40 in FIG. 11, and remains in the high state until the front edge of the clock pulse following the passage from the high state to the low state of the toothing signal. The signal at output Q 4 of the register indicated at 41 has an analogous form, but offset by the duration of three clock pulses with respect to the signal at output Q 1 . We also see in Figure 11 at 42, 43, 44 and 45 the signals at outputs Q 5 , Os, Q 7 and Q 8 .

L'horloge délivre également des impulsions à l'une des entrées d'une porte NON-ET46 dont l'autre entrée est reliée à la sortie Q1 du registre 30. La sortie de la porte NON-ET46 est connectée aux entrées d'horloge d'un compteur 47 et d'un décompteur 48 préchargeable. Dans ces conditions le compteur 47 compte et le décompteur 48 décompte lorsque la sortie Q1 est à l'état haut, à chaque front arrière d'impulsion d'horloge. Ils s'arrêtent de fonctionner lorsque la sortie Q1 revient à l'état bas, c'est-à-dire lorsque le signal de denture 7 revient à l'état bas.The clock also delivers pulses to one of the inputs of a NON-ET46 gate, the other input of which is connected to output Q 1 of register 30. The output of the NON-ET46 gate is connected to the inputs of clock of a counter 47 and of a prechargeable down counter 48. Under these conditions the counter 47 counts and the down counter 48 counts down when the output Q 1 is in the high state, at each trailing edge of the clock pulse. They stop operating when the output Q 1 returns to the low state, that is to say when the toothing signal 7 returns to the low state.

Le compteur 47 utilise les seize premiers bits de deux compteurs, à douze bits, montés en cascade du type MCM 14040 et son entrée d'initialisation est liée à la sortie d'une porte ET 49 dont une entrée est liée à la sortie Q7 du registre à décalage 30, par l'intermédiaire d'une porte inverseuse 50 alors que son autre entrée est liée à la sortie Q8 de ce registre 30. Par suite de cette disposition, le signal d'initialisation du compteur est fourni lorsque la sortie Q7 du registre passe à zéro, cela tant que la sortie Q8 est encore à l'état 1, c'est-à-dire pendant une impulsion d'horloge. Ce signal est représenté en 51 à la Figure 10. Les sorties 01 à Q16 du compteur 47 sont liées aux entrées de préchargement du décompteur 48 à 17 bits réalisé par quatre compteurs-décompteurs à quatre bits préchargeables du type MM 74c193, quatre circuits inverseurs Mc 14049 et un circuit supplémentaire pour réaliser le 17è bit non inversé, préchargé à zéro.The counter 47 uses the first sixteen bits of two counters, with twelve bits, connected in cascade of the type MCM 14040 and its initialization input is linked to the output of an AND gate 49 of which an input is linked to the output Q 7 shift register 30, via an inverting gate 50 while its other input is linked to the output Q 8 of this register 30. As a result of this arrangement, the counter initialization signal is supplied when the output Q 7 of the register goes to zero, as long as output Q 8 is still in state 1, that is to say during a clock pulse. This signal is represented at 51 in FIG. 10. The outputs 0 1 to Q 16 of the counter 47 are linked to the preloading inputs of the 48-bit up-down counter 48 produced by four pre-loadable four-bit up-down counters of the MM 74c193 type, four circuits. Mc 14049 inverters and an additional circuit to make the 17th bit not inverted, preloaded to zero.

Le décompteur 48 est préchargé par les sorties Q1 à Q16 du compteur 47, par le signal de commande de préchargement fourni par la sortie d'une porte NON-ET 52 dont l'une des entrées est liée, par l'intermédiaire d'une porte inverseuse 53, à la sortie Q5 du registre 30, alors que son autre entrée est liée à la sortie 06 de ce registre 30. Ce signal de commande, qui est représenté en 54 à la Figure 10, est fourni lorsque la sortie Q5 passe à 0, tant que la sortie Q6 est encore à l'état 1, c'est-à-dire pendant l'impulsion d'horloge, quatre cycles après le front de descente de Q1.The downcounter 48 is preloaded by the outputs Q 1 to Q 16 of the counter 47, by the preloading control signal supplied by the output of a NAND gate 52 of which one of the inputs is linked, via d an inverting door 53, at the output Q 5 of the register 30, while its other input is linked to the output 0 6 of this register 30. This control signal, which is represented at 54 in FIG. 10, is supplied when the output Q 5 goes to 0, as long as the output Q 6 is still in state 1, that is to say during the clock pulse, four cycles after the falling edge of Q 1 .

Le décompteur 48 est lié par ses sorties inversées Q1 à 016 aux entrées B, à B16 d'un comparateur 55. Sa sortie Q17 est liée à une entrée d'une porte NON-ET 56 qui a son autre entrée liée à une sortie du comparateur 55 donnant l'information A < B. La sortie de la porte 56 est liée à l'entrée D d'une bascule 57 dont l'entrée horloge est liée par l'intermédiaire d'une porte inverseuse 58 à la sortie Q4 du registre à décalage 30, à l'une des entrées d'une porte NON-ET59 associée en bascule avec une porte NON-ET 60, et au décompteur de créneaux chargeable 18, sur son entrée 61 recevant le signal "dent". La sortie de la bascule 59, 60, donnant l'information du chargement est connectée à l'entrée 62 du décompteur 18.The down-counter 48 is linked by its inverted outputs Q 1 to 0 16 to the inputs B, to B 16 of a comparator 55. Its output Q 17 is linked to an input of a NAND gate 56 which has its other linked input to an output of comparator 55 giving information A <B. The output of gate 56 is linked to input D of a flip-flop 57 whose clock input is linked via an inverting gate 58 to the output Q 4 of the shift register 30, to one of the inputs of a NAND gate 59 associated in rocker with a NAND gate 60, and to the loadable slot counter 18, on its input 61 receiving the signal "tooth". The output of the flip-flop 59, 60, giving the loading information is connected to the input 62 of the down-counter 18.

Le décompteur 48 est lié d'autre part par ses sorties Q1 à Q16 aux entrées d'une mémoire 63.The down-counter 48 is linked on the other hand by its outputs Q 1 to Q 16 to the inputs of a memory 63.

Le comparateur 55 a ses entrées B, à B16 liées au décompteur 48 et ses entrées A1 à A16 aux seize sorties de la mémoire 63.The comparator 55 has its inputs B, to B 16 linked to the down-counter 48 and its inputs A 1 to A 16 to the sixteen outputs of the memory 63.

La mémoire 63 a son entrée d'initialisation à zéro (clear) liée à la sortie 64 du décompteur 18 et son entrée E1, ordre d'écriture ou de mémorisation, liée à la sortie d'une porte inverseuse 65 inversant la sortie Q de la bascule 57 et reliée par ailleurs à l'une des entrées de la porte NON-ET 60.The memory 63 has its initialization input at zero (clear) linked to the output 64 of the downcounter 18 and its input E 1 , write or store order, linked to the output of an inverting gate 65 inverting the output Q of flip-flop 57 and also connected to one of the inputs of the NAND gate 60.

Le décompteur 18 est chargé par un dispositif câblé 66 donnant des valeurs 1 ou 0 sur ses entrées définies à partir du nombre de dents N de la couronne dentée. La sortie (carry out) 64 du décompteur 18 est liée à la bascule 22 en liaison par sa sortie 67 avec le circuit 9.The downcounter 18 is loaded by a wired device 66 giving values 1 or 0 on its inputs defined from the number of teeth N of the toothed ring. The output (carry out) 64 of the down-counter 18 is linked to the flip-flop 22 in connection by its output 67 with the circuit 9.

Le fonctionnement du circuit qui vient d'être décrit est le suivant.The operation of the circuit which has just been described is as follows.

A la mise sous tension, le micro-processeur est initialisé et lui-même, après un court laps de temps destiné au passage de quelques créneaux, initialise le compteur 18 par un dispositif classique non représenté.On power up, the microprocessor is initialized and itself, after a short period of time intended for the passage of a few slots, initializes the counter 18 by a conventional device not shown.

Les deux inverscurs 27 et 28 sont deux triggers donnant le signal de denture utilisé par le registre à décalage 30. Dans un premier temps, le signal de denture passe de l'état bas "0" à l'état haut "1".The two inverscurs 27 and 28 are two triggers giving the toothing signal used by the shift register 30. First, the signal gear changes from low state "0" to high state "1".

La sortie Q1 de ce registre 30 passe à "1" et le compteur 47 s'incrémente au rythme de l'horloge, mesurant la durée Tf du créneau à l'état 1, comme indiqué en 68 à la Figure 3. En même temps, le décompteur 48 préchargé à la valeur Ti-1 de la durée du créneau précédent, décompte au rythme de l'horloge (voir en 69 à la Figure 3). A la fin du créneau, le décompteur 48 contient la différence Ti-1 - Ti entre la durée du créneau précédent et celle du créneau en cours de mesure. Si la valeur T; est supérieure à la valeur Ti-1 alors la sortie Q17 du décompteur 48 passe à 1 quand ses sorties Q1..... Q16 passent à zéro, comme indiqué en 70 à la Figure 3.The output Q 1 of this register 30 changes to "1" and the counter 47 is incremented at the rate of the clock, measuring the duration T f of the slot at state 1, as indicated at 68 in FIG. 3. In at the same time, the down-counter 48 preloaded with the value T i-1 of the duration of the preceding slot, counts down to the rhythm of the clock (see at 69 in FIG. 3). At the end of the slot, the down counter 48 contains the difference T i-1 - T i between the duration of the previous slot and that of the slot being measured. If the value T; is greater than the value T i-1 then the output Q 17 of the down-counter 48 goes to 1 when its outputs Q 1 ..... Q 16 go to zero, as indicated in 70 in Figure 3.

Dans un deuxième temps, le signal de denture 7 passe de l'état 1 à l'état zéro.In a second step, the toothing signal 7 goes from state 1 to state zero.

Le registre à décalage 30 fournit, par l'intermédiaire des portes qui lui sont associées, différents signaux de synchronisation décalés dans le temps dont la forme et les effets seront examinés plus loin. A la fin du créneau, le comparateur 55 donne l'information de la comparaison entre la différence Ti - Ti-1 et la différence mémorisée dans la mémoire 63. Le résultat de la comparaison associée à la condition de signe sur la sortie Q17 du décompteur 48 dans la porte NON-ET 56 dont la sortie est liée à l'entrée D de la bascule 57 est échantillonné par cette dernière trois cycles après le front de descente de Q1 pour tenir compte de la stabilisation du comparateur, l'intervalle de trois cycles étant du au fait que l'entrée horloge de la bascule 57 est connectée à la sortie Q4 du registre 30.The shift register 30 provides, through the gates associated with it, various time-shifted synchronization signals the form and effects of which will be examined later. At the end of the slot, the comparator 55 gives the information of the comparison between the difference T i - T i-1 and the difference stored in the memory 63. The result of the comparison associated with the sign condition on the output Q 17 of the down-counter 48 in the NAND gate 56 whose output is linked to the input D of the flip-flop 57 is sampled by the latter three cycles after the falling edge of Q 1 to take account of the stabilization of the comparator, l the interval of three cycles being due to the fact that the clock input of the flip-flop 57 is connected to the output Q 4 of the register 30.

Si le résultat du test est positif, c'est-à-dire si T; est supérieur à Ti-1 et si la différence Ti - Ti- 1 est supérieure à la valeur mise en mémoire, la différence Ti - Ti-1 est immédiatement chargée dans la mémoire 63 par le signal inversé par l'inverseur 65, échantillonné et représenté en 71 aux Figures 3 et 10; la bascule est remise à 1, un demi-cycle d'horloge après, par l'entrée clear connectée à l'horloge de référence.If the test result is positive, i.e. if T; is greater than T i-1 and if the difference T i - T i- 1 is greater than the value stored in memory, the difference T i - T i-1 is immediately loaded into memory 63 by the signal inverted by the inverter 65, sampled and shown at 71 in Figures 3 and 10; the flip-flop is reset to 1, half a clock cycle after, by the clear input connected to the reference clock.

Ce signal 71 déclenche la bascule 59, 60 qui envoie au décompteur 18 un signal de référence 72 (voir Figures 3 et 10) assurant la recharge du décompteur 18. Le test effectué, la valeur T; contenue dans le compteur 47 est transférée dans le décompteur 48 par la commande du signal fourni par la porte NON-ET 52 qui est un top d'un cycle d'horloge décalé de quatre cycles par rapport au front de descente de 01, puisqu'il est déclenché par le passage à 0 de la sortie Q5 du registre 30.This signal 71 triggers the flip-flop 59, 60 which sends to the down counter 18 a reference signal 72 (see FIGS. 3 and 10) ensuring the recharging of the down counter 18. The test carried out, the value T; contained in the counter 47 is transferred to the down-counter 48 by controlling the signal supplied by the NAND gate 52 which is a top of a clock cycle shifted by four cycles relative to the falling edge of 0 1 , since 'it is triggered by the change to 0 of output Q 5 of register 30.

Enfin le compteur 47 est remis à zéro par la commande du signal fourni par la porte 49 qui est un top d'un cycle d'horloge, décalé de six cycles par rapport au front de descente de Q1. L'ensemble du circuit est alors prêt pour effectuer la mesure du créneau suivant.Finally the counter 47 is reset to zero by controlling the signal supplied by the gate 49 which is a top of a clock cycle, offset by six cycles relative to the falling edge of Q 1 . The entire circuit is then ready to carry out the measurement of the next slot.

Si la différence Ti - Ti - 1 est inférieure à la valeur mise dans la mémoire 63, le contenu de cette mémoire est conservé et la bascule 59 - 60 n'est pas déclenchée de sorte que le décompteur 18 n'est pas rechargé. Au contraire, le signal sortant en Q4 diminue d'une unité le contenu du décompteur 18. Le signal de denture passe de nouveau de l'état 0 à l'état 1 et le créneau suivant est contrôlé.If the difference T i - T i - 1 is less than the value put in the memory 63, the content of this memory is preserved and the flip-flop 59 - 60 is not triggered so that the down-counter 18 is not reloaded . On the contrary, the outgoing signal at Q 4 decreases the content of the down counter by one. The toothing signal again changes from state 0 to state 1 and the next slot is checked.

Si le décompteur 18 arrive à 0, cela veut dire que le contenu de la mémoire 63 correspond à la dent singulière 3.If the downcounter 18 reaches 0, this means that the content of the memory 63 corresponds to the singular tooth 3.

Le signal de carry émis en 64 et représenté en 73 à la figure 10, déclenche d'une part le signal de sortie 67 après une mise en forme par un circuit 22 approprié et connu en soi et d'autre part remet à zéro la mémoire 63; c'est donc un signal d'initialisation.The carry signal emitted at 64 and represented at 73 in FIG. 10, triggers on the one hand the output signal 67 after shaping by an appropriate circuit 22 known per se and on the other hand resets the memory 63; it is therefore an initialization signal.

Il s'agit là d'une originalité importante du dispositif. En effet, il aurait été tout à fait possible de charger directement par ce signal la mémoire 63 de la valeur du décompteur 48.This is an important originality of the device. Indeed, it would have been entirely possible to directly load the memory 63 with the value of the down-counter 48 by this signal.

En mettant à zéro la mémoire 63, on obtient le même résultat. La mémoire 63 est à zéro; le comparateur 55 indique donc que la valeur du décompteur est supérieure et le chargement s'effectue donc normalement, si le bit de signe sur la sortie Q17 du décompteur 48 est respecté. Cela augmente ainsi la sécurité du dispositif et autorise par ailleurs un fonctionnement très intéressant dans le cas particulier d'une dent dont le flux est diminué par modification de forme ou de matière.By zeroing memory 63, the same result is obtained. The memory 63 is at zero; the comparator 55 therefore indicates that the value of the down-counter is higher and the loading is therefore carried out normally, if the sign bit on the output Q 17 of the down-counter 48 is respected. This thus increases the safety of the device and also allows very interesting operation in the particular case of a tooth whose flux is reduced by modification of shape or material.

La Figure 11 représente le signal formé par le capteur à basse vitesse (ligne continue 6a) et à grande vitesse (ligne en pointillés 6b).Figure 11 shows the signal formed by the sensor at low speed (solid line 6a) and at high speed (dotted line 6b).

Il peut arriver comme le montrent les courbes 7a et 7b aux figures 12 et 13 que le signal de denture soi présente à basse vitesse et absent à grande vitesse. Le nombre de créneaux peut alors, à chaque tour, avoir la valeur N ou la valeur N - 1. Le dispositif qui vient d'être décrit fonctionne cependant tout à fait correctement. Si le compteur 18 est chargé à N - 2, la mise à zéro de la mémoire 63 s'effectue après le créneau de durée To.It can happen, as shown by curves 7a and 7b in FIGS. 12 and 13, that the toothing signal is present at low speed and absent at high speed. The number of slots can then, at each turn, have the value N or the value N - 1. The device which has just been described, however, functions quite correctly. If the counter 18 is loaded at N - 2, the memory 63 is reset to zero after the time slot To.

Dans le cas où le nombre de créneaux est N (Figure 12), le passage du créneau de durée T, n'est pas pris en considération, car le signe de la différence To - T, est positif. Le signal d'initialisation 72a se produit pour le créneau suivant pour lequel la différence T1 - T2 est négative.In the case where the number of slots is N (Figure 12), the passage of the slot of duration T, is not taken into consideration, because the sign of the difference T o - T, is positive. The initialization signal 72a occurs for the next slot for which the difference T 1 - T 2 is negative.

Lorsque le nombre de créneaux est N - 1, le signal d'initialisation a toujours bien lieu pour le créneau T'2 car la différence T'2 - T'o est prise en compte.When the number of slots is N - 1, the initialization signal always takes place for the slot T ' 2 because the difference T' 2 - T ' o is taken into account.

Il va de soi que la présente invention ne doit pas être considérée comme limitée au mode de réalisation décrit et représenté, mais en couvre, au contraire, toutes les variantes.It goes without saying that the present invention should not be considered as limited to the embodiment described and shown, but on the contrary covers all variants thereof.

La réalisation du dispositif peut être un circuit spécifique car l'invention est particulièrement bien adaptée à l'intégration numérique. Dans la version associée au micro-processeur Motorola 6 805 dont on utilise le timer en compteur d'événement, la solution est particulièrement économique le circuit intégré ne représente plus que quelques millimètres carrés de silicium implantés dans un boîtier plastique de huit broches (horloge in, horloge out, dent in, masse, alimentation, dent out, référence, clear).The realization of the device can be a specific circuit because the invention is particularly well suited to digital integration. In the version associated with the Motorola 6 805 microprocessor whose timer is used as an event counter, the solution is particularly economical; the integrated circuit no longer represents than a few square millimeters of silicon implanted in an eight-pin plastic case (clock in, clock out, tooth in, mass, power supply, tooth out, reference, clear).

Claims (7)

1. Device for detecting the angular position of a rotating part (1) having teeth (2), at least one of which has a singularity (3) whereas the other teeth are identical, which comprises a sensor (4) disposed in the vicinity of the teeth (2) and adapted for delivering a square wave signal, means for measuring the duration of a square wave corresponding to the passage of a tooth (2) in front of the sensor (4), and an initializable down-counter means (18), characterized in that it further comprises means (47 - 48) for measuring the difference between this duration and the duration of the preceding square wave, a means (55) for comparing this difference of duration with a previously stored difference of duration, means for storing in the memory (63) the new difference of duration and re-initializing the means for down-counting the teeth if the comparison gives a positive result, means for decrementing the teeth down-counting means (18) by a unit in the opposite case, and means controlled by the teeth down-counting means when it arrives at zero for reinitializing the memory (63) and the teeth down-counting means (18) and emitting an output signal.
2. Device according to claim 1, characterized in that the means for measuring the difference between the duration of a square wave and the duration of the preceding square wave comprise a clock, a counter (47) for counting the number of clock pulses during each square wave, a down-counter (48) previously loaded during measurement of the passage duration of the preceding square wave and down-counting the clock pulses at the same time as the counter (47) counts, and means for transferring the contents of the counter (47) into the down-counter (48) after each measurement of the duration of a square wave.
3. Device according to claim 1 or 2, characterized by the fact that the associated teeth down-counting means (18) is a programmable down-counter.
4. Device according to claim 1 or 2, characterized in that the associated down- counting means is the timer of the microprocessor, used as an event counter.
5. Device according to claim 1, characterized by the fact that the means for measuring the duration of the square waves is formed by the timer of the microprocessor itself.
6. Device according to claim 1, characterized by the fact that the comparison means, the test means, the teeth down-counting means, the means for decrementing the register at each instruction and the means forming the strategy assembly are incorporated in the microprocessor.
7. Device according to claim 1, characterized by the fact that re-initialization of the memory (63) consists in resetting it to zero and initialization of the downcounting is effected at a value lower by a unit than the value of the number of square waves.
EP19840402576 1983-12-30 1984-12-13 Detection device for the rotation angle of a spinning gear Expired EP0150642B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8321172 1983-12-30
FR8321172A FR2557699B1 (en) 1983-12-30 1983-12-30 DEVICE FOR DETECTING ANGULAR REFERENCE OF A ROTATING TOOTHED PART

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EP0150642A2 EP0150642A2 (en) 1985-08-07
EP0150642A3 EP0150642A3 (en) 1985-08-21
EP0150642B1 true EP0150642B1 (en) 1989-06-21

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EP19840402576 Expired EP0150642B1 (en) 1983-12-30 1984-12-13 Detection device for the rotation angle of a spinning gear

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DE (1) DE3478755D1 (en)
FR (1) FR2557699B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989009335A1 (en) * 1988-03-26 1989-10-05 Robert Bosch Gmbh Method and apparatus for monitoring rotation
EP0342508A1 (en) * 1988-05-16 1989-11-23 Siemens Aktiengesellschaft Method of generating trigger pulses
US5196844A (en) * 1989-08-22 1993-03-23 Nissan Motor Company, Ltd. Method and apparatus for detecting reference rotational angle for each cylinder in multiple-cylinder internal combustion engine
GB9401835D0 (en) * 1994-02-01 1994-03-30 Rover Group A method of detecting a marker in an engine position sensing system
FR2894665A1 (en) * 2006-04-25 2007-06-15 Siemens Vdo Automotive Sas Rotary component`s e.g. crankshaft, angular position determining method for internal combustion engine, involves distributing angular marks with same width on periphery of target, where set of distributed marks is identical

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2357061C2 (en) * 1973-11-15 1985-02-14 Robert Bosch Gmbh, 7000 Stuttgart Device for the delivery of uniform pulses at certain angular positions of a rotatable shaft and for the formation of at least one reference signal
JPS5826339Y2 (en) * 1977-07-20 1983-06-07 株式会社デンソー Rotation reference position detection device
FR2456937A1 (en) * 1979-05-17 1980-12-12 Volzh Ob Proizvo Timing measurement for electronic ignition systems - has two sensors to provide constant output pulse shape independent of engine speed
DE3011822A1 (en) * 1980-03-27 1981-10-01 Robert Bosch Gmbh, 7000 Stuttgart SENSOR ARRANGEMENT

Also Published As

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EP0150642A3 (en) 1985-08-21
FR2557699A1 (en) 1985-07-05
FR2557699B1 (en) 1986-07-04
EP0150642A2 (en) 1985-08-07
DE3478755D1 (en) 1989-07-27

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