GB2058358A - Detecting the rotational speed and/or angular position of a shaft - Google Patents
Detecting the rotational speed and/or angular position of a shaft Download PDFInfo
- Publication number
- GB2058358A GB2058358A GB8026393A GB8026393A GB2058358A GB 2058358 A GB2058358 A GB 2058358A GB 8026393 A GB8026393 A GB 8026393A GB 8026393 A GB8026393 A GB 8026393A GB 2058358 A GB2058358 A GB 2058358A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- counter
- mark
- marks
- additional
- 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.)
- Granted
Links
Classifications
-
- 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
- G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2454—Encoders incorporating incremental and absolute signals
- G01D5/2455—Encoders incorporating incremental and absolute signals with incremental and absolute tracks on the same encoder
- G01D5/2457—Incremental encoders having reference marks
-
- 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
- F02P7/061—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 pick-up devices without mechanical contacts
-
- 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
-
- 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
- G01P3/489—Digital circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The apparatus comprises a shaft disc (S) having segment marker teeth (21 to 32) and an additional tooth (33) or teeth for synchronisation, the or each additional tooth being spaced from the preceding tooth by a lesser or greater arc than from the next following tooth. Marker tooth signals, generated by an electric, inductive or electro-optical sensor (35), are evaluated by one or more first counters and a second counter operated at a higher clock frequency than the or any first counter so that the second counter only fails to reach the count of the or a respective first counter, when the interval between any two successive teeth is less than a predetermined amount whereupon a switch is operated to provide an output indicative of the sensing of the tooth concerned. That tooth can be used to identify the operation of a particular cylinder in an internal combustion engine. <IMAGE>
Description
SPECIFICATION
A disc for detecting the rotational speed and/or the marked angular position of a shaft and to 'evaluation apparatus using the disc
The invention relates to a disc to indicate angular position of a shaft, and to apparatus employing the disc, to evaluate signals derived from the disc.
In known apparatus of this kind for multicylinder internal combustion engines, it must be possible to associate one of the several regions with a specific cylinder of the internal combustion engine. Pins which are made from ferromagnetic material, and which are inserted into the disc, can be provided as reference mark pick-ups for this purpose and, when moving past an induction coil provided with an iron core, induce in the coil a reference mark pulse by which a region can be associated with a specific cylinder. However, arrangements of this kind involve additional expenditure for scanning the reference marks.
The object of the invention is to construct, for a particularly inductively operating sensor, the edge zone of the disc such that the individual regions can be detected by simple technical means and one of the regions can be provided with a reference mark which can be scanned by the same devices by which the regions are scanned. In accordance with the invention an additional.
reference, mark is disposed in a region of the disc, and the narrow marks are arranged so that the angular distance between said additional reference mark and the following or preceding mark is larger than its angular distance from the preceding or following mark as the case may be.
In one embodiment of the disc, one additional mark is provided, which may be spaced from the adjacent one of the narrow marks by substantially 50 of arc; and the narrow marks are equiangularly separated from one another. For instance, there may be twelve such narrow marks. In another embodiment, two regions are delimited by diametrically opposed narrow marks, and three additional marks are provided in each segment with the three additional marks being separated from the adjacent one of the narrow marks in the ratio of:- a, 2a, 4a, where 7a represents an angle of less than 1100, for instance, 700.
Electrical sensors, electrooptical sensors, inductive sensors, and sensors responding to other physical effects, can be influenced by the marks.
The invention also relates to an evaluation circuit for use with pulses generated when the marks move past a fixed sensor, comprising a first counter, a second counter, a memory, a comparator and a change-over switch actuable by the comparator, the first and second counters being actuated during each period between successive control pulses provided from the disc mark sensor to effect a count at different ratio and to store the reading of the first counter in the memory at the end of the second of the successive pulses, the count being stored in the memory for the next following period and then compared in the comparator with the count of the second count at the end of the next following period, whereby if the count of the second counter at the end of the next following period has not reached the stored value, said switch is caused to change its condition.Depending on the precise nature of the disc, one or more further counters, analogous to the first may be provided, each counting at a predetermined different rate. For use with a disc of the first embodiment thereof, the evaluation circuit compresses two counters, whereas for use with a disc of the second embodiment thereof, it comprises four counters, that is, three counters serving the purpose of the first counter, and one serving the purpose of the second counter.
Further developments of the invention are disclosed in embodiments which are described hereinafter and which are illustrated in the accompanying drawings.
In the drawings Figure 1 is an axial view of a pick-up disc in accordance with the invention, which is made from thin sheet steel and which has an associated sensor.
Figure 2 is a diagram of an evaluation circuit according to the invention for the sensor signals,
Figure 3 is time graph of the respective readings produced in two counters of Figure 2,
Figure 4 shows another embodiment of a pickup disc in accordance with the invention, and
Figure 5 is a switching diagram of an evaluation circuit for the pick-up disc of Figure 4.
The pick-up disc S shown in Figure 1 is mounted on a shaft W, such as the crankshaft of an internal combustion engine (not otherwise illustrated) and its edge zone is sub-divided into twelve regions 1 to 12. These regions are produced by punching out segments each extending through 270 in the circumferential direction, and are defined in a circumferential direction relative to a following or preceding region by a respective narrow, rectangular tooth 21 to 32 which projects beyond the circumferential surface of the regions and has a width of 30 measured in a circumferential direction.
In order to be able to identify the region indicated at 1 during rotation of the disc and to be able to associate it with a specific cylinder, such as the first cylinder of the internal combustion engine, a reference mark tooth 33 of the same construction as the other teeth is provided in the region 1 and is staggered by 50 in a circumferential direction relative to the preceding tooth 32. The tooth 33 has a pitch spacing of 300 - 50 = 250 relative to the following tooth 21 serving as a mark. In the illustrated embodiment, at 300 pitch is provided for the regions and has the great advantage that the pick-up disc permits universal application in all symmetrical internal combustion engines and even in asymmetrical V6 cylinder internal combustion engines. A further advantage resides in the fact that only a simple unipolar evaluation circuit is required.
In the arrangement illustrated in Figure 1, an inductive sensor 35 is located to sense the teeth 21 to 33 of the pick-up disc S at the given location, a sensor pulse lln being induced in the sensor 35 each time one of the teeth moves past the sensor. Referring to Figure 1, the sensor pulse induced by the tooth 26 is designated 116, and the pulse induced by the preceding tooth 25 is designated 115.
With a uniform rotational speed of the disc S, the sensor pulses lln induced by the teeth 21 to 32 follow one another with uniform periods, and only the tooth 33 serving as a pick-up mark induces a sensor pulse I which, compared with the aforesaid period, follows the sensor pulse 1112 at a short interval of time.
The evaluation circuit which will be further described hereinafter, and which is indicated at 36 in Figure 1, is provided in order to be able to separate the reference mark pulse I, which is to be associated with a predetermined position of the piston in one of the cylinders of the engine for, for example, producing an ignition spark at the correct time, from the other sensor pulses lln.
Referring to Figure 2, the evaluation circuit 36 includes a first counter Z1, a second counter Z2, a memory Sp, a comparator V and a change-over switch U. During the period p associated with two control pulses, the two counters are kept open to receive counting pulses having differing clock frequencies. The clock frequency fz of the counting pulses fed to the counter Z1 is substantially lower than the clock frequency f2 of the counting pulses fed to the second counter. As is shown in Figure 3 with reference to the period p10 associated with the two sensor pulses 1110 and 1111, owing to the lower counting frequency, the reading of the first counter increases to a substantially smaller extent than the reading, indicated by the double dot and dash lines, of the second counter Z2.At the
commencement of the next sensor pulse 1111 at the instant t2, the contents of the counter Z1 are stored in the memory Sp and the first counter is
reset to 0. The contents of the memory Sp are
indicated by broken lines in the top graph of Figure 2. The contents of the memory remain constant for the next period pl 1 commencing at t2. To illustrate the efficiency of the evaluation circuit, it is assumed that for this period the counting time p1 1 is 20% shorter than the counting time p10, this implying that the rotational speed of the shaft
W has also increased by 20%. The counter Z1 cannot reach the stored value during this shorter period p1 1.However, this does not have any effect, since the contents of the second counter Z2 have already exceeded the stored value before the comparison instant t3, and consequently the comparator V holds the change-over switch U in its illustrated switching position on the lead II.
In accordance with Figure 1 , the reference mark
I is only staggered by a small angle of rotation a relative to the tooth 32 and by the period pa relative to the sensor pulse 1112 and has to be separated from the other sensor pulses. This occurs during the counting operation which commences at the instant t3 and which terminates at the instant t4 and during which the counter Z2 has not reached the reading of the counterZ1 which was reached during the preceding period p1 1 and which is stored in the memory Sp and is indicated by the broken line 37 in Figure 3. The comparator V thus puts the change-over switch U into the other switching position in which its connects the sensor lead 38 to the lead 39 which only carries the-reference marks I.Before the end of the next counting period ending with the sensing of tooth 21,the counter
Z2 reaches the stored value received by the counterZ1 and indicated at 34, and switches back to the lead 40.
Figure 4 shows a pick-up disc in which four teeth 41, 42, 43 and 44 are offset relative to one another by respective angles of rotation a, 2 a and 4a. A specific function for an internal combustion engine (not illustrated) can be associated with each of these teeth. Staggered through 1 800 therefrom, a tooth 45 and a tooth 46 follow at a distance a = 100, then a tooth at a distance 2a = 200 and then finally a fourth tooth 48 which is staggered through 1800 relative to the tooth 44 and which has an angle of rotation 4a = 400 relative to the preceding tooth 47. Thus, in the illustrated pick-up disc, the functions associated with the teeth 41 to 44 and 45 to 48 are repeated during each revolution of the disc or of the crankshaft of the internal combustion engine.
Analogously to the circuit of Figure 2, the circuit of Figure 5 provides several counters Z1,
Z1 1, Z1 n for the purpose of evaluation, each of which counters is fed with counting pulses of the respective clock frequencies f1 I f1 2, f1 n and transfers the reading reached to the memory Sp.
The memory is connected to a comparator V in the same manner as in the embodiment previously described. The contents of the memory are compared with the reading reached by a counter
Z2 which, during the scanned angular regions or periods, is fed with counting pulses whose frequency f2 is higher than the sum of the clock frequencies f1 to f1 n. The changeover switch U switches to the reference mark lead I when the reading of the counters remains below the value of the memory Sp.
Claims (15)
1. A disc for detecting the rotational speed and/or a marked angle of rotation of a shaft, the disc being mounted, in use, to rotate with the shaft and whose periphery incorporates a plurality of regions, delimited by reference marks, iocated one behind the other in the direction of rotation, and the circumferential surfaces of which are at the same radial distance from the axis of rotation, with each region being separated from the following region by a respective narrow mark which is defined by steep flanks extending transversely of the direction of rotation, wherein an additional, reference, mark is disposed in a region of the disc, and the narrow marks are arranged so that the angular distance between said additional reference mark and the following or preceding mark is larger than its angular distance from the preceding or following mark as the case may be.
2. A disc as claimed in claim 1, wherein the marks have a width of from 20 to 5 extending in a circumferential direction.
3. A disc as claimed in claim 2, wherein said width is 30.
4. A disc as claimed in claim 1, 2 or 3, wherein the marks other than the additional mark are each staggered through 300 relative to one another in the circumferential direction of the disc.
5. A disc as claimed in claim 4, wherein there are twelve of said other marks.
6. Sensor as claimed in claim 4 or 5, wherein the additional reference mark is staggered through substantially 50 relative to its adjacent mark in the circumferential direction of the disc.
7. A disc according to claim 1, 2 or 3, wherein two regions are delimited by diametricaily opposed narrow marks, and three additional marks are provided in each segment with the three additional marks being separated from the adjacent one of the narrow marks in the ratio of:a, 2a, 4a, where 7a represents an angle of less than 1100.
8. A disc for detecting the rotational speed and/or a marked angle of rotation of a shaft, substantially as hereinbefore described with reference to Figure 1 or Figure 4 of the accompanying drawings.
9. An evaluation circuit for use with a disc as claimed in any of the preceding claims, comprising a first counter, a second counter, a memory, a comparator and a change-over switch actuable by the comparator, the first and second counters being actuated during each period between successive control pulses provided from the disc mark sensor to effect a count at different ratio and to store the reading of the first counter in the memory at the end of the second of the successive pulses, the count being stored in the memory for the next following period and then compared in the comparator with the count of the second counter at the end of the next following period, whereby if the count of the second counter at the end of the next following period has not reached the stored value, said switch is caused to change its condition.
10. An evaluation circuit as claimed in claim 9, for use with a disc as claimed in claim 4, 5 or 6, wherein the circuit, in respect of the counters, consists of said first and second counters.
11. An additional circuit as claimed in claim 9, wherein the circuit, wherein said first counter is replicated according to the number of additional marks provided on the disc.
12. An evaluation circuit as claimed in claim 11, for use with a disc as claimed in claim 7, wherein said first counter is provided in triplicate with each of the counters thus provided each counting at a predetermined different rate.
13. An evaluation circuit substantially as hereinbefore described with reference to Figures 2 and 3 or to Figure 5.
14. An evaluation circuit as claimed in any of preceding claims 9 to 1 3, including a sensor for sensing the passage of a mark on the disc.
1 5. An evaluation circuit as claimed in claim 14, wherein said sensor is an electrical, electro optical or an inductive one.
1 6. Apparatus for determining the rotational speed and/or marked angular position of the shaft comprising a disc as claimed in any of the preceding claims 1 to 8 and an evaluation circuit as claimed in claim 14 or
15.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792933516 DE2933516A1 (en) | 1979-08-18 | 1979-08-18 | DEVICE FOR SPEED DETECTION AND ANGLE SEGMENT DETECTION OF A SHAFT, IN PARTICULAR THE CRANKSHAFT OF AN INTERNAL COMBUSTION ENGINE |
| DE19792933517 DE2933517A1 (en) | 1979-08-18 | 1979-08-18 | ENCODER FOR, IN PARTICULAR INDUCTIVE, DETECTION OF THE SPEED AND / OR A MARKED TURNING ANGLE OF A SHAFT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2058358A true GB2058358A (en) | 1981-04-08 |
| GB2058358B GB2058358B (en) | 1984-04-04 |
Family
ID=25780589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8026393A Expired GB2058358B (en) | 1979-08-18 | 1980-08-13 | Detecting the rotational speed and/or angular position of a shaft |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2058358B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0130762A2 (en) * | 1983-07-02 | 1985-01-09 | LUCAS INDUSTRIES public limited company | Angular position detector |
| WO1986000415A1 (en) * | 1984-06-27 | 1986-01-16 | Robert Bosch Gmbh | Device for detecting the angular position of a rotary member |
| EP0396200A1 (en) * | 1989-05-03 | 1990-11-07 | Van Aarsen Machinefabriek B.V. | Pelleter |
| US4972332A (en) * | 1987-07-28 | 1990-11-20 | Caterpillar Inc. | Apparatus for determining the speed, angular position and direction of rotation of a rotatable shaft |
| EP0413841A1 (en) * | 1989-08-22 | 1991-02-27 | Unisia Jecs Corporation | Method and apparatus for detecting reference rotational angle for each cylinder in an internal combustion engine |
| EP0506399A1 (en) * | 1991-03-29 | 1992-09-30 | Cummins Electronics Company, Inc. | Single sensor apparatus and method for determining engine speed and position |
| GB2259988A (en) * | 1991-09-30 | 1993-03-31 | Fuji Heavy Ind Ltd | Crank angle and cylinder number detecting system and method for internal combustion engine |
| AU662855B2 (en) * | 1993-03-25 | 1995-09-14 | Novatech Controls Pty Ltd | Oxygen probe |
| EP0747710A1 (en) * | 1995-06-08 | 1996-12-11 | EUROCOPTER FRANCE, Société Anonyme dite: | System for detecting and monitoring the rotation speed of at least one rotor and the rotation speed of at least one motor of a rotary-wing aircraft, e.g. helicopter |
| FR2770902A1 (en) * | 1997-11-13 | 1999-05-14 | Bosch Gmbh Robert | DEVICE FOR DETECTING THE ROTATION OF A WORKPIECE, INCLUDING ITS DIRECTION OF ROTATION |
| DE102017214166A1 (en) * | 2017-08-14 | 2019-02-14 | Volkswagen Aktiengesellschaft | Speed sensor assembly |
| 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 |
| CN111024976A (en) * | 2019-12-24 | 2020-04-17 | 新疆金风科技股份有限公司 | Measuring method and measuring device for rotary power generation equipment and impeller measuring system |
| RU2757069C1 (en) * | 2020-08-07 | 2021-10-11 | Акционерное общество "Центр судоремонта "Звездочка" (АО "ЦС "Звездочка") | Method for determining the rotation speed of a shaft |
-
1980
- 1980-08-13 GB GB8026393A patent/GB2058358B/en not_active Expired
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0130762A3 (en) * | 1983-07-02 | 1986-02-12 | Lucas Industries Public Limited Company | Angular position detector |
| EP0130762A2 (en) * | 1983-07-02 | 1985-01-09 | LUCAS INDUSTRIES public limited company | Angular position detector |
| WO1986000415A1 (en) * | 1984-06-27 | 1986-01-16 | Robert Bosch Gmbh | Device for detecting the angular position of a rotary member |
| AU571962B2 (en) * | 1984-06-27 | 1988-04-28 | Robert Bosch Gmbh | Device for picking up the angle position of a rotating part |
| US4972332A (en) * | 1987-07-28 | 1990-11-20 | Caterpillar Inc. | Apparatus for determining the speed, angular position and direction of rotation of a rotatable shaft |
| EP0396200A1 (en) * | 1989-05-03 | 1990-11-07 | Van Aarsen Machinefabriek B.V. | Pelleter |
| 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 |
| EP0413841A1 (en) * | 1989-08-22 | 1991-02-27 | Unisia Jecs Corporation | Method and apparatus for detecting reference rotational angle for each cylinder in an internal combustion engine |
| EP0663595A2 (en) * | 1991-03-29 | 1995-07-19 | Cummins Electronics Company, Inc. | Single sensor apparatus and method for determining engine speed and position |
| EP0506399A1 (en) * | 1991-03-29 | 1992-09-30 | 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 |
| GB2259988A (en) * | 1991-09-30 | 1993-03-31 | Fuji Heavy Ind Ltd | Crank angle and cylinder number detecting system and method for internal combustion engine |
| US5267544A (en) * | 1991-09-30 | 1993-12-07 | Fuji Jukogyo Kabushiki Kaisha | Crank angle and cylinder number detecting system and method for internal combustion engine |
| GB2259988B (en) * | 1991-09-30 | 1995-02-15 | Fuji Heavy Ind Ltd | Crank angle and cylinder number detecting system and method for internal combustion engine |
| AU662855B2 (en) * | 1993-03-25 | 1995-09-14 | Novatech Controls Pty Ltd | Oxygen probe |
| EP0747710A1 (en) * | 1995-06-08 | 1996-12-11 | EUROCOPTER FRANCE, Société Anonyme dite: | System for detecting and monitoring the rotation speed of at least one rotor and the rotation speed of at least one motor of a rotary-wing aircraft, e.g. helicopter |
| FR2735239A1 (en) * | 1995-06-08 | 1996-12-13 | Eurocopter France | SYSTEM FOR THE DETECTION AND MONITORING OF THE ROTATION SPEED OF AT LEAST ONE ROTOR AND OF THE ROTATION SPEED OF AT LEAST ONE ENGINE OF A ROTATING WING AIRCRAFT, SUCH AS A HELICOPTER |
| US5831429A (en) * | 1995-06-08 | 1998-11-03 | Eurocopter France | System for detecting and monitoring the rotational speed of at least one rotor and the rotational speed of at least one motor of a rotary-wing aircraft, such as a helicopter |
| FR2770902A1 (en) * | 1997-11-13 | 1999-05-14 | Bosch Gmbh Robert | DEVICE FOR DETECTING THE ROTATION OF A WORKPIECE, INCLUDING ITS DIRECTION OF ROTATION |
| DE102017214166A1 (en) * | 2017-08-14 | 2019-02-14 | Volkswagen Aktiengesellschaft | Speed sensor assembly |
| US11119113B2 (en) | 2017-08-14 | 2021-09-14 | Volkswagen Aktiengesellschaft | Rotational speed sensor arrangement |
| 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 |
| CN111024976A (en) * | 2019-12-24 | 2020-04-17 | 新疆金风科技股份有限公司 | Measuring method and measuring device for rotary power generation equipment and impeller measuring system |
| RU2757069C1 (en) * | 2020-08-07 | 2021-10-11 | Акционерное общество "Центр судоремонта "Звездочка" (АО "ЦС "Звездочка") | Method for determining the rotation speed of a shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2058358B (en) | 1984-04-04 |
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