EP0101332B1 - Synchronisierungsanlage für ein elektronisches Zündsystem - Google Patents

Synchronisierungsanlage für ein elektronisches Zündsystem Download PDF

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Publication number
EP0101332B1
EP0101332B1 EP19830401213 EP83401213A EP0101332B1 EP 0101332 B1 EP0101332 B1 EP 0101332B1 EP 19830401213 EP19830401213 EP 19830401213 EP 83401213 A EP83401213 A EP 83401213A EP 0101332 B1 EP0101332 B1 EP 0101332B1
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EP
European Patent Office
Prior art keywords
signal
ignition
signals
weights
detectors
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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
EP19830401213
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English (en)
French (fr)
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EP0101332A1 (de
Inventor
Siri-Yuth Loth
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
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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Filing date
Publication date
Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0101332A1 publication Critical patent/EP0101332A1/de
Application granted granted Critical
Publication of EP0101332B1 publication Critical patent/EP0101332B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
    • F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/0556—Protecting the coil when the engine is stopped
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1848—Number of cylinders twelve

Definitions

  • the invention relates to a synchronization device for an electronic ignition system intended for a multi-cylinder internal combustion engine and more particularly to a 4-stroke gas engine.
  • a device of this type is known from French patent 7,827,923.
  • this known device as many weights are provided as there are spark generators and at least one auxiliary weights angularly offset with respect to one of the main weights, at an angle equal to the angular spacing of the detectors.
  • This provision is necessary when using dual-channel automatic advance circuits or the spacing of the detectors must be at least equal to the maximum advance angle of the motor but less than the angle separating the point of ignition of two successive cylinders.
  • the number of weights for one engine revolution is equal to the number minus one of cylinders to be ignited during this engine revolution and that the angular spacing of the detectors is such that for each ignition point minus two of the same engine revolution the detectors are simultaneously energized while only one detector is energized for the other two ignition points and the electronic means include a coincidence circuit which receives the two signals E1 and E2 and supplies the signal SO when these signals are in different logic states and one of the signals E1 or E2 is in a predetermined logic state, and a logic circuit providing the signal S1 when at least one of the signals E1 or E2 is delivered by the detectors.
  • a device applies to an ignition system comprising n generators each paired with 2 cylinders set at 360 ° to a 2n cylinder engine.
  • the disc on which n - 1 weights are placed is driven directly by the crankshaft, it can however be driven by the camshaft and then have 2n - 2 weights.
  • the reference signals SO and S1 can be used to control a device for sequential and cyclic distribution of the triggering signals of the spark generators comprising a programmable counter whose number of states is equal to the number of spark generators, such as example as that described in French patent 7,638,128.
  • the signal S0 is not disturbed by defects in form and synchronization or by the accidental absence of one of the signals from the detectors.
  • the coincidence circuit comprises means generating from the signal E1 two signals A and B, the rising edge of which coincides with the rising edge of E1 and of lengths such that B ⁇ A ⁇ E1, means supplying a pulse C including the rising edge corresponding to the falling edge of B and the falling edge to the falling edge of A, means delivering an inverse signal E2 of E2, a logic operator of type ET delivering the reference signal SO when the pulse C is in the same logic state as signal E2.
  • a safety device which blocks the ignition in the event of an abnormal absence of one of these signals.
  • This safety device comprising two programmable counters, one counting the pulses E1, the other the pulses E2, both reset to 0 by the reference signal SO and logic means delivering a safety signal which blocks ignition if the SO signal appears while the count is less than the normal number of pulses E1 or E2: this is explained below.
  • a particularly reliable synchronization device is thus obtained which does not require great precision in the positioning of the counterweights and the detectors.
  • the embodiment which will be described applies to a 12-cylinder V-shaped engine with successive ignition points of the cylinders equidistant or not.
  • the invention can of course be applied to an engine with N cylinders, N being a number greater than two, even or odd.
  • Each spark generator is coupled to two cylinders whose ignition point is' phase shifted by 360 ° crankshaft.
  • the entire device is shown diagrammatically in FIG. 1.
  • Six spark generators 21 to 26 each distribute the ignition energy simultaneously to a cylinder in the first row of cylinders (numbered 1 to 6) and to a cylinder in the second row of cylinders (numbered 7 to 12) .
  • the distribution block 50 cyclically triggers the spark generators in order 21 to 26 and it can be seen by the connections to the cylinders that the ignition order carried out is 1-8-5-10-3-7-6- 11-2-9-4-12.
  • the distribution block 50 prepares the triggering orders for the spark generators as a function essentially of a synchronization signal SO supplied by a synchronization signal generator 52 and a progress signal S1 supplied by a control block and trigger 53.
  • the signals SO and S1 are produced from signals E1 and E2 delivered cyclically during each engine cycle by an adapter 51, an engine cycle corresponding to the sequential ignition of all the engine cylinders.
  • the distribution block 50 is shown in detail in Fig. 2-11 comprises a programmable counter 100 whose reset reset input receives the synchronization signal SO and the count input C the progress signal S1.
  • the counter 100 has six counting outputs (numbered 1 to 6) each connected respectively to an input of the six NAND gates 101 to 106 and a seventh output 7 looped through to the reset reset input.
  • the other inputs of the doors 101 to 106 receive from the control and trigger block 53 a so-called energy-controlled EC signal.
  • the outputs of doors 101 and 106 are each connected respectively to an input of NOR gates 111 to 116, the other input of which can receive an ignition inhibition IA signal from safety block 55.
  • the cyclic distribution is correctly ensured if a signal S1 is supplied to the counter at each change to the top dead center of a cylinder and a synchronization signal SO of initialization for each engine revolution to the counter 100 (eg the cylinders 1 to 6).
  • Fig. 3 shows the electromechanical means developing them. They comprise a disc 60 integral in rotation with the engine shaft or crankshaft 59 which rotates in the opposite direction to the needles. of a watch.
  • the disc 60 carries at its periphery 5 identical conductive metal weights m1 to m5 spaced consecutively by a constant angle (60 ° in the example), the weights m5 and m1 being spaced twice this angle.
  • two fixed detectors 61, 62 Next to these weights are arranged two fixed detectors 61, 62.
  • the constituent circuits of the detectors can for example be of the type described in the French patent 7638128 mentioned above.
  • the detectors 61, 62 respectively send signals E1, E2 of logic level 1.
  • the setting of the detectors is such that the signal E1 corresponds each time to a top dead center.
  • the timing diagrams of the signals E1, E2, SO and S1 are shown in FIG. 4.
  • a coincidence circuit receives the two signals E1 and E2 and supplies the signal SO when E1 and E2 are in logic state 1 and a logic circuit (Fig. 6) supplies the signal S1 when at least one of the signals E1 or E2 is in logic state 1.
  • the coincidence circuit comprises an AND gate 63 and an inverter 64.
  • the logic circuit 65 consists of an OR gate.
  • the sensor described in FIG. 3 applies to an engine with equidistant ignition points (case of a 12 cylinders in V at 60 °).
  • the ignition points are not equidistant, they are alternately spaced by 75 ° and 45 °.
  • the usual means of adapting and filtering the signals have not been shown.
  • a sensor of this configuration is shown in FIG. 7 and the corresponding timing diagrams in FIG. 8.
  • Figures 9 to 11 show the disturbances of the synchronization signal S0 due to improper calibration and / or poor relative positioning of the signals E1 and E2.
  • the appearance of parasitic SO signals may disturb the order in which the cylinders are ignited and thus cause serious engine damage.
  • Fig. 9 represents the case where the radial distances of the detectors with respect to the weights are unequal
  • FIG. 10 the case where the angle between the detectors is not equal to the angle between two weights having to simultaneously excite them
  • FIG. 11 the general case of a detection imprecision leading to a deviation of the rising or falling edges of two pulses E1, E2 simultaneous.
  • the synchronization signal generator 52 (Fig. 12) comprises a first monostable circuit conventionally constituted by two NAND gates 66 and 67, the capacitor C1 and the resistor R1. This monostable receives the signal E1 and delivers the signal To. A second monostable (68, 69, C2, R2) delivers the signal B. The duration of the signals A and B is respectively regulated by the choice of C1 R1 and C2R2. A NAND gate 70 whose inputs receive the signals A and B delivers the pulse C. A NAND gate 71 whose inputs receive the signal E2 and the pulse C delivers the signal ⁇ . Finally, an AND gate 72 delivers the signal SO from the pulses C and D. The signals S0, C and D are delivered respectively to terminals 73, 74 and 75.
  • the device functions correctly if the detectors 61, 62 indeed supply a signal E1 or E2 when each counterweight passes. If an E1 or E2 signal is absent due to the failure of a detector, an excess SO signal or no SO signal is obtained during a cycle, as the case may be (Fig. 14 and 15). This leads to a shift in the distribution of sparks which can cause serious engine damage.
  • the operational amplifier 76 receives from the control and trigger block 53 a TV voltage as a function of the speed of the motor.
  • the output of the operational amplifier 76 is connected to the base of a transistor T1 of the NPN type, the emitter of which is connected to ground and the collector connected to the base of a transistor T2 of the NPN type.
  • the base of the transistor T2 is connected to the power supply by a resistor R7, its emitter to ground and its collector on the one hand to the power supply via a resistor R10 and on the other hand to the inputs R of the two flip-flops 77 and 78 RS type (for example a 4013) by resistors R8 and R9.
  • the input S of the flip-flop 77 receives the synchronization signal SO coming from the output 73 of the synchronization signal generator 52.
  • the output to of the flip-flop 77 is connected to one of the inputs of the NOR logic gate 80 , the other input of which is connected to an inverter 79 which receives the signal D taken at the output 75 of the signal generator 52.
  • the output of the gate 80 is connected to the input S of the flip-flop 78 whose output Q delivers the ignition prohibition signal IA which is applied to an input of each of the doors 111 to 116 (FIG. 2) of the distribution block 50.
  • the base of the transistor T2 receives the safety signal SC coming from the sensor safety block 54.
  • the purpose of the safety block 55 is to prohibit ignition until a first synchronization signal SO has not appeared since the counter 100 is then not synchronized. As long as the TV signal arriving at the operational amplifier 76 is not of a sufficient level to make the transistors T1 and T2 pass, a level 1 is applied to the inputs R of the flip-flops 77 and 78 which remain insensitive to the signals that they receive. The output to flip-flop 78 then delivers a signal IA of level 1 which, applied to doors 111 to 116 prohibits ignition.
  • the inputs R of flip-flops 77 and 78 receive a signal 0. This allows flip-flop 77 to switch in the presence of the first signal S0 applied to its input S and rocker 78 to switch in the presence of the first signal D arriving by the inverter 79.
  • the flip-flops 77 and 78 are used in the same way to prevent ignition when a level 1 safety signal SC from the sensor safety block 54 is applied to the base of transistor T2.
  • this safety block comprises two programmable counters 81 and 82 counting one the pulses E1, the other the pulses E2, the one and the other reset to 0 by the synchronization signal SO and logic means delivering the safety signal SC which blocks the ignition if the signal SO appears while the count is less than the normal number of pulses E1 or E2.
  • the counting input C of the counter 81 receives the signals E1 coming from the synchronization signal generator 52 and corresponding to the calibrated signal E1.
  • the counting input C of the counter 82 receives the signals E2 coming from the sensor 51.
  • the counters are reset by loopback and sends the synchronization signal SO to their inputs RZ as described for the counter 100 (doors CU N ° 01, 02, 03, 04).
  • the logic means comprise a first group of two flip-flops RS 83 and 84 testing the outputs A1 and D1 of the counter 81 and a second group of flip-flops RS 85 to 89 testing the outputs B2 to F2 of the counter 82.
  • the R and S inputs of flip-flops 83 to 89 are connected to the outputs of the counters 81 to 82 as shown in FIG. 18.
  • the Q outputs of flip-flops 83 and 84 are connected to the two inputs of a NOR gate 90 and the Q outputs of flip-flops 85 to 89 to the five inputs of a NAND gate 91 which can be produced by a circuit of the type 4068 from MOTOROLA.
  • the output of the NOR gate 90 is connected to the input S of a flip-flop D 92 and the output of the NAND gate 91 to the input S of a second flip-flop D 93 through the inverter circuit 91a .
  • the outputs Q of flip-flops 92 and 93 control via the transistors T3 and T4 the cut-off signal SC delivered to the output 94 of the sensor safety block 54.
  • the output of the NAND gate 91 switches to state 0 which brings after inversion by the circuit 91a the input S of the flip-flop 93 to state 1 and as before the signal SC takes the value 0 which causes the blocking of the safety block 55. It will be noted that the condition is possible thanks to the fact that the rising edge of signal C is used as the end of state 0 of outputs 0 of flip-flops 85 to 89, while the start of state 0 of the next flip-flop is triggered by the rising edge of corresponding signal E2 which is ahead of the rising edge of C.
  • control and trigger block 53 shown diagrammatically in FIG. 16.
  • the circuit 97 receives via the transistor T7 a trigger signal at each appearance of a signal E1 or E2 and the signal-voltage TV as a function of the speed delivered by the circuit 96. It delivers at its output 98a the so-called energy signal EC controlled applied to the inputs of doors 101 to 106 of the distribution block 50 and to its output 98b via the transistor T6 the signal S1 applied to the input C of the counter 100.
  • the TV signal used by the security block 55 is taken from terminal 99.

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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)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (6)

1. Synchronisiereinrichtung für eine elektronische Zündanlage einer vielzylindrischen Brennkraftmaschine mit einer Vielzahl sekundärer Funkenerzeuger (21 bis 26), von denen jeder die Zündung eines oder zweier Zylinder steuert, sowie mit
elektromechanischen Einrichtungen (51), die aus einem Satz unter sich völlig identischer, auf einer durch eine Ausgangswelle (59) des Motors in Drehung versetzten Scheibe (60) angeordneter metallischer Massestücke (m1 bis m5) und aus einem der Umlaufbahn der Massestücke gegenüberliegenden feststehenden Detektorpaar (61, 62) bestehen,
elektronischen Einrichtungen zum Verarbeiten von Ausgangssignalen E1 und E2 des Detektorpaars, die ein Bezugsignal SO des Zündzyklus der Zylinder des Motors und ein Bezugsignal S1 der Zündung jedes Zylinders liefern, und
einem durch die Signale SO und S1 gesteuerten Verteilerblock (50), dadurch gekennzeichnet, daß
die Anzahl der Massestücke (m1 bis m5) für eine Motorumdrehung gleich der um eins verminderten Anzahl (1 bis 12) der während dieser Motorumdrehung zu zündenden Zylinder und die Winkelversetzung der Detektoren (61, 62) so ist, daß die beiden Detektoren (61, 62) für jeden um zwei verminderten Zündpunkt einer derartigen Motorumdrehung simultan erregt werden, wenn für die beiden anderen Zündpunkte ein einziger Detektor erregt wird,
die elektronischen Einrichtung (52 bis 55) eine Koinzidenzschaltung (63, 64 oder 52) aufweisen, die die beiden Signale E1 und E2 entgegennehmen und das Signal SO abgeben, wenn diese Signale unterschiedliche logische Zustände angeben, sofern das eine der Signale E1 oder E2 einen vorbestimmten logischen Zustand angibt, und eine logische Schaltung (65 oder 53) aufweisen, die das Signal S1 abgibt, wenn mindestens das eine der Signale E1 oder E2 ihm von den Detektoren (61, 62) zugeführt wird.
2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibe (60), auf der die Massestücke (m1 bis m5) angeordnet sind, durch die Kurbelwelle (59) direkt angetrieben ist, daß die Anzahl der Zylinder gleich 2n und die Anzahl der Massestücke gleich n-1 ist und daß die Zündanlage n Funkenerzeuger (21 bis 26) enthalt, von denen jeder mit zwei um 360° versetzten Zylindern verkoppelt ist.
3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Scheibe, auf der die Massestücke angeordnet sind, durch die Nockenwelle (19) angetrieben ist und daß die Anzahl der Zylinder gleich 2n und die Anzahl der Massestücke gleich 2n-2 ist.
4. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Koinzidenzschaltung (52) Schaltungsteile (66 bis 69) aufweist, die aufgrund des Signals E1 zwei Signale A und B erzeugen, deren ansteigende Flanke mit der ansteigenden Flanke des Signals E1 koinzidiert und deren Dauer so ist, daß B < A < E1 ist, weiterhin Schaltungsteile (70) aufweist, die einen Impuls C abgeben, dessen ansteigende Flanke mit der absteigenden Flanke des Signals B und dessen absteigende Flanke mit der absteigenden Flanke des Signals A übersinstimmt, weiterhin Schaltungsteile (71) aufweist, die ein dem Signal E2 (oder D) entgegengesetztes Signal E2 (oder D) abgeben, und eine logische Schaltung (72) vom Typ UND aufweist, die das Bezugsignal SO abgibt, wenn der Impuls C den gleichen logischen Zustand angibt wie das Signal E2 (oder D).
5. Einrichtung nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie eine Sicherheitseinrichtung (54) aufweist, die bei nichtnormaler Abwesenheit eines Impulses E1 oder E2 die Zündung blockiert, weiterhin zwei voreinstellbare Zähler (81, 82) aufweist, von denen der eine die Impulse E1 und der andere die Impulse E2 zählt und der eine und der andere durch das Signal SO auf null zurücksetzt, und logische Einrichtungen aufweist, die ein Sicherheitssignal SC abgeben.. das die Zündung blockiert, wenn das Signal SO auftritt, sofern die Zählung innerhalb der normalen Anzahl von Impulsen E1 und E2 ist.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß sie eine Initialschaltung (55) aufweist, die unterhalb einer vorgegebenen Motorgeschwindigkeit oder wenn die Sicherheitseinrichtung (54) ihm das eine nichtnormale Abwesenheit eines Impulses E1 oder E2 angebende Signal SC zuführt, ein Zündverhinderungssignal 1A an den Verteilerblock (50) abgibt.
EP19830401213 1982-07-28 1983-06-14 Synchronisierungsanlage für ein elektronisches Zündsystem Expired EP0101332B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213195A FR2531146B1 (fr) 1982-07-28 1982-07-28 Dispositif de synchronisation pour un systeme d'allumage electronique
FR8213195 1982-07-28

Publications (2)

Publication Number Publication Date
EP0101332A1 EP0101332A1 (de) 1984-02-22
EP0101332B1 true EP0101332B1 (de) 1987-01-21

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EP19830401213 Expired EP0101332B1 (de) 1982-07-28 1983-06-14 Synchronisierungsanlage für ein elektronisches Zündsystem

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EP (1) EP0101332B1 (de)
DE (1) DE3369364D1 (de)
FR (1) FR2531146B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3602292A1 (de) * 1986-01-25 1987-08-06 Audi Ag Geberanordnung
WO1993009393A1 (en) * 1991-11-06 1993-05-13 Orbital Engine Company (Australia) Pty. Limited Method and apparatus for determining position of a body in cyclic movement
RU2209996C1 (ru) * 2001-12-18 2003-08-10 Открытое акционерное общество "Чебоксарское научно-производственное приборостроительное предприятие "ЭЛАРА" Устройство для системы зажигания двигателя внутреннего сгорания

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2541594C3 (de) * 1975-09-18 1978-09-07 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur Ruhestromabschaltung bei einer für Brennkraftmaschinen bestimmten Zündanlage
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
DE2802582A1 (de) * 1978-01-21 1979-07-26 Bbc Brown Boveri & Cie Elektronischer drehwinkelgeber
FR2446467A1 (fr) * 1979-01-09 1980-08-08 Renault Procede et appareillage de reperage de la position angulaire d'une piece animee d'un mouvement de rotation

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FR2531146B1 (fr) 1986-05-16
FR2531146A1 (fr) 1984-02-03
DE3369364D1 (en) 1987-02-26
EP0101332A1 (de) 1984-02-22

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