GB2059598A - Inductive rotational speed or position transducers - Google Patents

Inductive rotational speed or position transducers Download PDF

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Publication number
GB2059598A
GB2059598A GB8031093A GB8031093A GB2059598A GB 2059598 A GB2059598 A GB 2059598A GB 8031093 A GB8031093 A GB 8031093A GB 8031093 A GB8031093 A GB 8031093A GB 2059598 A GB2059598 A GB 2059598A
Authority
GB
United Kingdom
Prior art keywords
tooth
segments
teeth
disc
mutually
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.)
Withdrawn
Application number
GB8031093A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB2059598A publication Critical patent/GB2059598A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/2013—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by a movable ferromagnetic element, e.g. a core
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals

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

Abstract

A transducer comprises an iron disc (S) rotatable relative to an inductive sensor (T) and having a plurality of mutually congruent segments (s) each comprising a tooth and an adjacent tooth gap, and at least one segment (S1) whose tooth (10) has a circumferential length different from that of the teeth (1 to 6) in the other mutually congruent segments, whereby rotational speed and/or angular position of a shaft can be determined. <IMAGE>

Description

SPECIFICATION Improvements in or relating to inductive rotational speed sensor devices The present invention relates to inductive sensor devices for detecting the rotational speed of a shaft, It is known in a sensor device for detecting the rotational speed of a shaft, to use a disc which rotates with the shaft and whose periphery has a plurality of segments which are located one after another in the direction of rotation and each of which comprises a tooth and an adjacent tooth gap, which segments are of substantially mutually congruent construction with respect to the axial spacing of the peripheral surface of the teeth and of the tooth gaps and with respect to the width of the teeth and the tooth gaps measured in the circumferential direction.
According to the present invention an inductive sensor device for detecting the rotational speed and/or a predetermined angular position of a shaft comprises a disc which is arranged to be rotated with the shaft relatively to an inductive sensor and whose periphery has a plurality of mutually congruent segments which are located one after another in the intended direction of rotation of the disc and each of which comprises a tooth and an adjacent tooth gap, and which in a predetermined segemental region corresponding to the predetermined angular position of the shaft is provided with at least one segment whose tooth has a circumferential length different from the circumferential length of the teeth in the other mutually congruent segments.
By means of a sensor device embodying the present invention it is possible not only to detect the rotational speed of a shaft but additionally or alternatively to detect a predetermined angular position of such shaft. A sensor device embodying the present invention is eminently suitable for use in an internal combustion engine for controlling a device operating procedure such as the instant of ignition in relation to an angular position of the engine crankshaft.
In one embodiment of the invention one segment of the sensor disc has a tooth which is longer in the circumferential direction than the teeth in the other mutually congruent segments.
In another embodiment two mutually adjacent segments of the sensor disc have teeth which are longer in the circumferential direction than the teeth in the other mutually congruent segments.
In a further embodiment two mutually adjacent segments of the sensor disc have only a single common tooth which extends over a circumferential length which is equal to at least that of two teeth and one tooth gap in the other mutually congruent segments.
The invention will be further described by way of example with reference to the accompanying drawings, in which: Fig. 1 is an axial view of a sector, comprising approximately 800, of a sensor disc according to one embodiment of the invention, Fig. 2 is a linear development of part of the rim region of the sensor disc of Fig. 1, Fig. 3 is a graph of voltage against time of a signal generated in a sensor unit illustrated diagrammatically integral in response to rotation of the disc of Fig. 1, Fig. 4 is a linear development of a part of the rim region of a modified sensor disc according to a second embodiment of the invention which is otherwise not illustrated, Fig. 5 is a graph of voltage against time of a signal generated in a sensor unit in response to rotation of the disc of Fig. 4, Fig. 6 is a linear development of part of the rim region of another sensor disc according to a third embodiment of the invention, and Fig. 7 is a graph of voltage against time of a signal generated in a sensor unit in response to rotation of the disc of Fig. 6, A sensor disc S illustrated in Fig. 1 is punched from magnetic material, for example, sheet iron and its periphery is sub-divided into, for example, 36 segments s each of which extends over 1000.
Each of the segments s has one of 36 teeth of which the teeth belonging to congruent segments are designated 1 to 6 in Fig. 1. Furthermore, each segment has an associated tooth gap 7 whose base is defined by a radius r2, whilst the peripheral surfaces of the teeth have a larger radius rl.
The disc S is mounted on a shaft (indicated at W) of an internal combustion engine, such as the shaft of the distributor of the engine, and, when the disc is rotated in the direction of the arrow in Fig. 1, the teeth of the sensor disc successively move past an inductive sensor T and induce in a coil 8 of the sensor T substantially sinusoidal alternating voltage half-waves of the kind indicated at 9 in Fig. 3.
In order to be able to associate a predetermined angular position of the sensor dise S with an operating procedure of the internal combustion engine, such as for the purpose of determining the instant ignition for one of the cylinders of the internal combustion engine, one of the segments is marked relative to the other, mutually congruent segments by a deviation from the congruence, in the manner shown in Fig. 1.
This marking is achieved in that the associated tooth 10 is substantially widened in a circumferential direction in the marked segment and constitutes approximately 80% of the otherwise unchanged segment. The tooth gap 11 located in front of the widened tooth 10 is thereby shortened to a considerable extent, so that only a very weak positive half-wave 12 appears in the voltage characteristic shown in Fig. 3. This can be detected by simple means in an electronic evaluating circuit, so that it is possible to detect the marked segment from the other segments by means of the widened tooth 10 and to associate it with the desired operating procedure of the internal combustion engine.
In a disc according to a second embodiment of the invention, of which a linear development of part of the rim is shown in Fig. 4, the teeth 1 5 and 1 6 of two successive segments are widened to a considerable extent such that only a very short gap 1 7 is created between these two teeth. This short gap leads to the deformation of the voltage characteristic which is shown in Fig. 5 and by which the marked double segment can be detected.
In a disc according to a third embodiment of the invention, only a portion of the development of the rim of which is shown in Fig. 6, two segments immediately following one another are used for marking the predetermined angular position.
However, the teeth associated with these two segments are widened such that they form a single continuous tooth 1 8 such that a gap no longer exists as between the other segments. This rnsblts in the voltage characteristic which is shown in Fig. 7 and in which a positive and a negative half-wave are absent at location 1 9.

Claims (5)

1. An inductive sensor device for detecting the rotational speed and/or a pre-determined angular position of a shaft, comprising a disc which is arranged to be rotated with the shaft relatively to an inductive sensor and whose periphery has a plurality of mutually congruent segments which are located one after another in the intended direction of rotation of the disc and each of which comprises a tooth and an adjacent tooth gap, and which in a predetermined segmental region corresponding to the predetermined angular position of such shaft is provided with at least one segment whose tooth has a circumferential length different from the circumferential length of the teeth in the other mutually congruent segments.
2. An inductive sensor device as claimed in claim 1, in which two mutually adjacent segments of the sensor disc have teeth which are longer in the circumferential direction than the teeth in the other mutually congruent segments.
3. An inductive sensor device as claimed in claim 1, in which two mutually adjacent segments of the sensor disc have only a single common tooth which extends over a circumferential length which is equal to at least that of two teeth and one tooth gap in the other mutually congruent segments.
4. An inductive sensor device as claimed in claim 1, in which one segment of the sensor disc has a tooth which is longer in the circumferential direction than the teeth in the other mutually congruent segments.
5. An inductive sensor device, constructed and arranged and adapted to operate substantially as hereinbefore particularly described with reference to and as illustrated in the accompanying drawings.
GB8031093A 1979-09-29 1980-09-26 Inductive rotational speed or position transducers Withdrawn GB2059598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792939643 DE2939643A1 (en) 1979-09-29 1979-09-29 INDUCTIVE SPEED OR ROTATIONAL ENCODER

Publications (1)

Publication Number Publication Date
GB2059598A true GB2059598A (en) 1981-04-23

Family

ID=6082305

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8031093A Withdrawn GB2059598A (en) 1979-09-29 1980-09-26 Inductive rotational speed or position transducers

Country Status (4)

Country Link
DE (1) DE2939643A1 (en)
FR (1) FR2466775A1 (en)
GB (1) GB2059598A (en)
IT (1) IT1132795B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071885A2 (en) * 1981-08-06 1983-02-16 Atlas Fahrzeugtechnik GmbH Flyweel gear pulse generator comprising a marked tooth
FR2526953A1 (en) * 1982-05-11 1983-11-18 Citroen Sa Magnetic detector for rotational speed and shaft position - has toothed ring with metal plate in zone where teeth are removed and uses magneto-resistive pick=up
GB2162645A (en) * 1984-06-29 1986-02-05 Marelli Autronica Detecting top dead centre of i.c. engine pistons
WO1991013363A2 (en) * 1990-02-22 1991-09-05 Ford Motor Company Limited Signal conditioning circuit
EP0506399A1 (en) * 1991-03-29 1992-09-30 Cummins Electronics Company, Inc. Single sensor apparatus and method for determining engine speed and position
WO1997019358A1 (en) * 1995-11-20 1997-05-29 Orbital Engine Company (Australia) Pty. Limited Electronic position and speed sensing device
EP1731738A1 (en) * 2004-04-02 2006-12-13 Keihin Corporation Crank angle detection device and ignition timing control device for internal combustion engine
CN105675907A (en) * 2016-03-31 2016-06-15 中国神华能源股份有限公司 Speed measuring device, slag conveyor structure and power plant boiler
CN105705951A (en) * 2013-11-11 2016-06-22 通用电气公司 Method for reducing error in rotor speed measurements
US10234262B2 (en) 2010-11-18 2019-03-19 Continental Automotive France Sensor for measuring angular position, and measurement compensation method
DE102017128183A1 (en) * 2017-11-28 2019-05-29 Bdr Thermea Group B.V. Method for controlling an internal combustion engine in a combined heat and power plant and device for detecting operating parameters of an internal combustion engine in a combined heat and power plant
FR3129439A1 (en) * 2021-11-25 2023-05-26 Vitesco Technologies TOOTHED TARGET FOR CRANKSHAFT

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3031357A1 (en) * 1980-08-20 1982-04-08 Robert Bosch Gmbh, 7000 Stuttgart COMBINED INCREMENT AND REFERENCE BRAND RECOGNITION FOR A ROTATING SHAFT, IN PARTICULAR THE CRANKSHAFT OF AN INTERNAL COMBUSTION ENGINE
AT375188B (en) * 1982-05-12 1984-07-10 List Hans DEVICE FOR AUTOMATIC DIAGNOSIS OF A FOREIGN DRIVEN 4-STROKE INTERNAL COMBUSTION ENGINE
DE3403150C1 (en) * 1984-01-31 1985-07-04 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Arrangement for generating control pulses for operating a video recording and playback device
DE4312424C2 (en) * 1993-04-16 1997-04-24 Iav Motor Gmbh Housing cover with a speed sensor device and a dynamic sealing ring
DE19813497C2 (en) * 1998-03-26 2000-11-16 Vogt Electronic Ag Inductive displacement sensor
DE102004060336A1 (en) * 2004-12-15 2006-07-06 Siemens Ag Feedback wheel with reverse rotation coding for a crankshaft or camshaft sensor
DE102007033745B4 (en) 2007-07-19 2014-07-24 Zf Friedrichshafen Ag Inductive speed detection

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH539880A (en) * 1971-07-30 1973-07-31 Delmoran Ag Control device on a positioning drive and its use
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
IT1043269B (en) * 1975-10-10 1980-02-20 Magneti Marelli Spa INVIDUATION SYSTEM OF A MULTIPLE OF ANGULAR POSITIONS A ROTATING ORGAN
JPS5436961A (en) * 1977-08-29 1979-03-19 Nissan Motor Angleeoffrotation detector

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071885A2 (en) * 1981-08-06 1983-02-16 Atlas Fahrzeugtechnik GmbH Flyweel gear pulse generator comprising a marked tooth
EP0071885A3 (en) * 1981-08-06 1983-06-29 Atlas Fahrzeugtechnik Gmbh Flyweel gear pulse generator comprising a marked tooth
FR2526953A1 (en) * 1982-05-11 1983-11-18 Citroen Sa Magnetic detector for rotational speed and shaft position - has toothed ring with metal plate in zone where teeth are removed and uses magneto-resistive pick=up
GB2162645A (en) * 1984-06-29 1986-02-05 Marelli Autronica Detecting top dead centre of i.c. engine pistons
WO1991013363A2 (en) * 1990-02-22 1991-09-05 Ford Motor Company Limited Signal conditioning circuit
WO1991013363A3 (en) * 1990-02-22 1991-10-17 Ford Motor Canada Signal conditioning circuit
EP0506399A1 (en) * 1991-03-29 1992-09-30 Cummins Electronics Company, Inc. Single sensor apparatus and method for determining engine speed and position
EP0663595A2 (en) * 1991-03-29 1995-07-19 Cummins Electronics Company, Inc. Single sensor apparatus and method for determining engine speed and position
EP0663595A3 (en) * 1991-03-29 1995-09-13 Cummins Electronics Company, Inc. Single sensor apparatus and method for determining engine speed and position
US6208131B1 (en) 1995-11-20 2001-03-27 Oribatal Engine Company Electronic position and speed sensing device
WO1997019358A1 (en) * 1995-11-20 1997-05-29 Orbital Engine Company (Australia) Pty. Limited Electronic position and speed sensing device
EP1731738A1 (en) * 2004-04-02 2006-12-13 Keihin Corporation Crank angle detection device and ignition timing control device for internal combustion engine
EP1731738A4 (en) * 2004-04-02 2012-07-04 Keihin Corp Crank angle detection device and ignition timing control device for internal combustion engine
US10234262B2 (en) 2010-11-18 2019-03-19 Continental Automotive France Sensor for measuring angular position, and measurement compensation method
CN105705951A (en) * 2013-11-11 2016-06-22 通用电气公司 Method for reducing error in rotor speed measurements
US10539588B2 (en) 2013-11-11 2020-01-21 General Electric Company Method for reducing error in rotor speed measurements
CN105675907A (en) * 2016-03-31 2016-06-15 中国神华能源股份有限公司 Speed measuring device, slag conveyor structure and power plant boiler
DE102017128183A1 (en) * 2017-11-28 2019-05-29 Bdr Thermea Group B.V. Method for controlling an internal combustion engine in a combined heat and power plant and device for detecting operating parameters of an internal combustion engine in a combined heat and power plant
FR3129439A1 (en) * 2021-11-25 2023-05-26 Vitesco Technologies TOOTHED TARGET FOR CRANKSHAFT
FR3129438A1 (en) * 2021-11-25 2023-05-26 Vitesco Technologies METHOD FOR DETERMINING AN ANGULAR POSITION OF A TOOTHED TARGET
WO2023094326A1 (en) * 2021-11-25 2023-06-01 Vitesco Technologies GmbH Method for determining an angular position of a toothed target

Also Published As

Publication number Publication date
FR2466775A1 (en) 1981-04-10
FR2466775B3 (en) 1983-07-18
IT1132795B (en) 1986-07-02
IT8024979A0 (en) 1980-09-26
DE2939643A1 (en) 1981-04-16

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)