EP0150642B1 - Messeinrichtung für die Winkellage eines rotierenden Zahnrades - Google Patents

Messeinrichtung für die Winkellage eines rotierenden Zahnrades 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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English (en)
French (fr)
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EP0150642A2 (de
EP0150642A3 (en
Inventor
Patrick Herbault
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.)
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
Publication of EP0150642A2 publication Critical patent/EP0150642A2/de
Publication of EP0150642A3 publication Critical patent/EP0150642A3/fr
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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
    • 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)

Claims (7)

1. Einrichtung zur Bestimnung der Winkelposition eines rotierenden Bauteils (1), welches mit Zähnen (2) versehen ist, von denen mindestens einer eine Singularität (3) aufweist, während die übrigen Zähne identisch ausgebildet sind, mit einen Meßfühler (4), der in der Nähe der Zähne (2) angeordnet und dazu geeignet ist, ein Signal aus Rechteckimpulsen zu liefern, und Mitteln zum Messen der Zeitdauer eines dem Durchgang eines Zahnes (2) vor den Meßfühler (4) entsprechenden Reckteckimpulses sowie einem initialisierbaren Mittel (18) zum Abwärtszählen, dadurch gekennzeichnet, daß sie außerdem Mittel (47 - 48) zum Messen der Differenz zwischen dieser Zeitdauer und der Zeitdauer des vorhergehenden Rechteckimpulses aufweist, sowie ein Mittel (55) zum Vergleichen dieser Zeitdauerdifferenz mit einer vorher eingespeicherten Zeitdauerdifferenz, Mittel zum Eingeben der neuen Zeitdauerdifferenz in den Speicher (63) und zum Reinitialisieren der Mittel zum Abwärtszählen der Zähne, wenn der Vergleich ein positives Resultat besitzt, sowie Mittel zum Dekrementieren der Mittel (18) zum Abwärtszählen der Zähne um eine Einheit im gegenteiligen Falle und von den Mitteln zum Abwärtszählen der Zähne, wenn diese den Nullwert erreichen, angesteuerte Mittel zum Reinitialisieren des Speichers (63) und der Mittel (18) zum Abwärtszählen der Zähne und zur Abgabe eines Ausgangssignals.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zum Messen der Differenz zwischen der Zeitdauer eines Rechteckimpulses und der Zeitdauer des vorhergehenden Rechteckimpulses einen Taktgeber aufweisen, sowie einen Zähler (47) zum Zählen der Anzahl der vom Taktgeber während jedes Rechteckimpulses abgegebenen Impulse, einen Abwärtszähler (48), der während der Messung der Zeitdauer des Durchgangs des vorhergehenden Rechteckimpulses voreingestellt wird und die Taktimpulse während des Zählens des Zählers (47) abwärts zählt und Mittel zum Überführen des Inhalts des Zählers (47) in den Abwärtszähler (48) nach jeder Messung der Zeitdauer eines Rechteckimpulses.
3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das angeschlossene Mittel (18) zum Abwärtszählen der Zähne ein programmierbarer Abwärtszähler ist.
4. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das angeschlossene Mittel zum Abwärtszählen der als Ereigniszähler verwendete Zeitgeber des Mikroprozessors ist.
5. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Mittel zum Messen der Zeitdauer der Rechteckimpulse durch den Zeitgeber des Mikroprozessors selbst gebildet wird.
6. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Mittel zum Vergleichen, die Mittel zum Prüfen zum Abwärtszählen von Zähnen, zum Dekrementieren eines Registers bei jedem Befehl und die Mittel zur Realisierung der Gesamtstrategie in einen Mikroprozessor integriert sind.
7. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Reinitialisierung des Speichers (63) darin besteht, ihn auf den Nullwert zurückzusetzen und daß die Initialisierung der Abwärtzählung bei einem Wert bewirkt wird, der um eine Einheit unterhalb des Wertes für die Anzahl der Rechteckimpulse liegt.
EP19840402576 1983-12-30 1984-12-13 Messeinrichtung für die Winkellage eines rotierenden Zahnrades Expired EP0150642B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8321172A FR2557699B1 (fr) 1983-12-30 1983-12-30 Dispositif de detection de reference angulaire d'une piece dentee tournante
FR8321172 1983-12-30

Publications (3)

Publication Number Publication Date
EP0150642A2 EP0150642A2 (de) 1985-08-07
EP0150642A3 EP0150642A3 (en) 1985-08-21
EP0150642B1 true EP0150642B1 (de) 1989-06-21

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EP19840402576 Expired EP0150642B1 (de) 1983-12-30 1984-12-13 Messeinrichtung für die Winkellage eines rotierenden Zahnrades

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EP (1) EP0150642B1 (de)
DE (1) DE3478755D1 (de)
FR (1) FR2557699B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3850406T2 (de) * 1988-03-26 1994-10-13 Bosch Gmbh Robert Einrichtung und anlage zur dreherfassung.
EP0342508A1 (de) * 1988-05-16 1989-11-23 Siemens Aktiengesellschaft Verfahren zum Erzeugen von Auslöseimpulsen
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 (fr) * 2006-04-25 2007-06-15 Siemens Vdo Automotive Sas Procede et dispositif de determination de la position d'une piece rotative, tel qu'un vilebrequin, d'un moteur a combustion interne

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2357061C2 (de) * 1973-11-15 1985-02-14 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur Abgabe von gleichmäßigen Impulsen bei bestimmten Winkelstellungen einer drehbaren Welle und zur Bildung von wenigstens einem Bezugssignal
JPS5826339Y2 (ja) * 1977-07-20 1983-06-07 株式会社デンソー 回転基準位置検出装置
FR2456937A1 (fr) * 1979-05-17 1980-12-12 Volzh Ob Proizvo Dispositif de mesure de la position angulaire du pignon d'un systeme numerique d'allumage pour un moteur a combustion interne
DE3011822A1 (de) * 1980-03-27 1981-10-01 Robert Bosch Gmbh, 7000 Stuttgart Sensoranordnung

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Publication number Publication date
EP0150642A2 (de) 1985-08-07
FR2557699A1 (fr) 1985-07-05
DE3478755D1 (en) 1989-07-27
EP0150642A3 (en) 1985-08-21
FR2557699B1 (fr) 1986-07-04

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