WO2004079385A1 - Hall effect sensor - Google Patents
Hall effect sensor Download PDFInfo
- Publication number
- WO2004079385A1 WO2004079385A1 PCT/IB2004/000637 IB2004000637W WO2004079385A1 WO 2004079385 A1 WO2004079385 A1 WO 2004079385A1 IB 2004000637 W IB2004000637 W IB 2004000637W WO 2004079385 A1 WO2004079385 A1 WO 2004079385A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gear wheel
- monitoring
- sensor
- toothed gear
- tooth
- Prior art date
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
- G01D5/24471—Error correction
- G01D5/2448—Correction of gain, threshold, offset or phase control
-
- 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
- G01D5/142—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 using Hall-effect devices
- G01D5/147—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 using Hall-effect devices influenced by the movement of a third element, the position of Hall device and the source of magnetic field being fixed in respect to each other
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
Definitions
- the present invention relates mainly to a Hall effect sensor and in particular for a Hall effect sensor used for monitoring the position of ferrous gear wheels.
- a Hall effect sensor can be used to detect the presence or absence of a tooth on a gear wheel. This is achieved by placing a Hall element between a biasing magnet and the gear wheel to measure variations in magnetic flux as the gear wheel turns.
- the output of the Hall element is input to a processing means which compares the output of the Hall element to a set of threshold parameters and thus outputs a binary signal indicative of the presence or absence of a tooth.
- threshold parameters There are typically a pair of threshold parameters: a rising signal becoming greater than the first threshold parameter indicating the presence of a tooth; and a falling signal dropping below the second threshold parameter indicating the absence of a tooth or vice-versa dependant on the relative orientation of the magnet and the Hall sensor.
- Such sensors are often used to monitor the position of the CAM and crankshafts in a modern gasoline or diesel internal combustion engine.
- the performance requirements demanded of such a sensor in automotive applications are dictated by the timing accuracy and repeatability needed to ensure that the emissions generated by the engine are within legal limits.
- a further requirement for automotive applications is that of accommodating variations in mechanical tolerance. Such variations include changes in effective diameter of the gear wheel caused by temperature or manufacturing tolerance, and tooth to tooth variation caused by mechanical or material variations. Additionally variations can be caused by drift in the voltage supplied to the sensor by the engines battery.
- Hall sensors use averaging techniques to determine the average variation in flux between teeth and thus calculate a best fit pair of threshold parameters and track long term variations in these parameters. Such systems are limited since the best fit pair of threshold parameters may not be optimal for a large percentage of the teeth on the gear wheel.
- a method of monitoring a toothed gear wheel comprising the steps of: positioning a Hall element adjacent to the gear wheel to detect variations in magnetic flux as the gear wheel rotates; comparing the output of the Hall element to a set of threshold parameters and thus outputting a binary signal indicative of the presence or absence of a tooth, wherein different threshold parameters are provided for different teeth.
- This method allows account to be taken of variation between teeth thus allowing for more accurate tracking of the gear wheel position.
- a biasing magnetic flux is provided.
- the biasing flux may be provided by permanent or temporary magnetisation of the gear wheel or by the provision of a permanent magnet or electromagnet on the opposite side of the Hall element to the gear wheel.
- the different threshold parameters provided for each tooth are individual pairs of threshold parameters and most preferably, each pair of individual threshold parameters is optimised.
- the output of the Hall element is compared to the threshold parameters by a processing means and most preferably, the processing means monitors the output change of the Hall element associated with each individual tooth over time and uses long term averaging to calculate optimised threshold parameter pairs for each individual tooth.
- the processing means recalculates optimised threshold parameter pairs for each individual tooth subsequent to each time that particular tooth is detected. This recalculation compensates for inaccuracies caused by temperature variation or long term drift.
- the senor contains a set of stored threshold parameter pairs allowing detection of teeth to commence as soon as the sensor is switched on.
- a set of stored threshold parameter pairs may comprise a single pair of threshold parameters or may alternatively comprise a number of threshold parameter pairs.
- the stored parameter pairs may be a standard stored set of parameters, used each time the sensor is switched on or they may be the optimised individual parameter pairs in use the last time the sensor was switched off.
- the sensor may have a multiple modes and may select one particular stored set of threshold parameters from a number of stored sets of threshold parameters when it is in a particular mode.
- the optimised individual threshold parameters are stored as deviations from the standard stored set of parameters. Deviations from a stored threshold are preferably stored digitally and are converted to an analogue voltage when applied to the stored threshold parameters. As the maximum size of a deviation is likely to be smaller in value than the threshold parameter itself, this reduces the amount of data storage space required for variations in the threshold parameter pairs and additionally allows conversion between analogue threshold parameters and their stored digital equivalents to run more quickly. Furthermore, if there is a data storage failure, only the deviations from the stored threshold parameters are lost. This allows monitoring to continue, if less accurately, until either the sensor is able to recalculate optimised parameters or until the sensor is repaired or replaced. /
- the processing means In order that the processing means is able to use the correct individual threshold parameters for each tooth, it should either be provided with information indicating the number of teeth on a particular gear wheel or alternatively it should be operative to be able to calculate the number of gear teeth on a given gear wheel 5 by analysing the output of the Hall element for repeating patterns.
- the sensor selects a reference tooth to enable synchronisation of the individual threshold parameters with the teeth on the gear wheel.
- the sensor is able to synchronise the individual threshold parameters with a gear wheel having fewer teeth than the maximum number of threshold parameters that the 10 sensor can store.
- the senor is adapted to operate in accordance with the method of the first aspect of the present invention and the sensor may incorporate any or 20 all of the features described in relation to the first aspect of the invention as appropriate.
- the processing means and the data storage means are incorporated in a single integrated circuit and most preferably the Hall element is additionally incorporated in a single integrated circuit with the processing means and the data storage means.
- the senor may be connected to an engine controller and used to monitor the position of a gear wheel in an engine.
- the sensor is adapted to output information related to the position of the gear wheel to the engine controller and is additionally adapted to receive control signals from the engine controller.
- the sensor may automatically offset one or more individual threshold parameters by a particular value or the sensor may switch from one mode to another mode.
- Figure 1 shows a Hall sensor according to the present invention in use to monitor the position of a gear wheel and a plot representing the output of the Hall sensor and the variation in magnetic flux density as the gear wheel turns;
- FIG. 2 is a block diagram showing the components of the Hall sensor of figure 1.
- a Hall sensor 102 is placed between a magnet 104 and a ferrous gear wheel 106.
- the gear wheel 106 is turning in a clockwise direction, as it turns a succession of teeth 108 pass close to the Hall sensor 102.
- the flux emanating from the magnet 104 will become attracted to the lower reluctance path provided by the ferrous gear tooth 108 and thus the magnetic flux density in the vicinity of the Hall sensor 102 increases.
- Changes in the effective diameter of the gear wheel 106 or other mechanical or material variations between the individual teeth 108 mean that the peaks in line 110 are not constant from tooth to tooth.
- the size of the peaks or at least the relative size of the peaks associated with adjacent teeth 108 should however vary little with each subsequent rotation.
- the Hall sensor 102 is embodied by a single integrated circuit and comprises a Hall element 202, a processing means 204, and a data storage means 206.
- the Hall element 202 generates a voltage in response to and proportional to the local magnetic flux density, this voltage is input to the processing means 204.
- the processing means 204 monitors the output of the Hall element 202 and compares the output to a set of individual threshold parameter pairs for each tooth 108 stored in the data storage means 206.
- the output of Hall element 202 rises above the first threshold parameter of a threshold parameter pair, the output of the processing means 204 becomes high.
- the output of the processing means 204 becomes low.
- the processing means then proceeds to compare the output of the hall element 202 to the first threshold parameter of the threshold parameter pair associated with the next tooth 108.
- the output of the processing means 204 is thus a binary signal, being high when a tooth 108 is adjacent to the Hall element 202 and low otherwise as illustrated by line 112 in figure 1.
- the output of the processing means 204 may be monitored by external circuitry (not shown) and means are provided for connecting the output of the processing means to further circuitry (not shown). In particular, by monitoring the frequency at which the output of the processing means 204 switches, the speed of rotation of the gear wheel 106 can be calculated. In addition, if the starting orientation of the gear wheel 106 is known, the instantaneous orientation of gear wheel 106 can be calculated.
- Values for the first and second threshold parameters are stored in the data storage means 206 wherein there are individual first and second threshold parameters stored for each individual tooth 108.
- the threshold parameter pairs stored for each individual tooth 108 are optimised. This is achieved by taking a long term average of the value of the output of the Hall element associated with each individual tooth and thus calculating appropriate values for the individual first and second threshold parameters. The long term average value is recalculated subsequent to each detection of the particular tooth by the processing means 204.
- the optimised threshold parameters are stored as deviations from a standard stored pair of threshold parameters.
- the calculated deviations are stored as digital values in the data storage means 206 and are subsequently converted to analogue values and applied to the analogue voltages of the standard stored parameter pair when the particular tooth corresponding to the particular deviation is to be detected.
- the processing means 204 When the sensor is first turned on, the processing means 204 is able to use the stored standard pair of threshold parameters to begin detection of teeth immediately. Once detection of teeth 108 has begun, the processing means 204 begins to calculate optimised individual threshold parameters for each tooth 108. It is possible, if desired, to provide more than one stored pair of threshold parameters and the sensor can then select a particular pair of stored threshold parameters to use when beginning detection of teeth 108.
- the processing means 204 first selects an individual tooth 108 to be a reference tooth.
- the processing means 204 to synchronise the individual optimised threshold parameter pairs with the gear teeth 108. If alternatively, the number of teeth on a gear wheel is not known, the processing means 204 first monitors the output of the Hall element 202 to detect patterns and to thus determine how many teeth 108 gear wheel 106 has. The processing means 204 then selects a reference tooth as described above. The processing means 204 is thus able to synchronise the individual optimised threshold parameter pairs with the gear teeth 108 even if the number of teeth 108 is less than the maximum number of threshold parameter pairs that can be stored.
- Means are provided to allow signals to be input to the processing means
- Input signals may inform the sensor of the number of teeth on a particular gear wheel, may cause the sensor to adjust the stored deviation for one or more individual parameters, or in particular may be used to switch the sensor from one mode to another mode.
- the sensor described above is suitable for use in conjunction with an engine controller for monitoring the position of a gear wheel within an engine.
- the engine controller may send signals to the sensor causing the sensor to alter its mode, its threshold parameters or the number of teeth on a gear wheel it is trying to detect. Additionally the engine controller may act to change the mode of the sensor, adjust the operation of the engine or output an alarm in response to signals received from the sensor.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04718356.1A EP1604219B1 (en) | 2003-03-08 | 2004-03-08 | Hall effect sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0305352.7 | 2003-03-08 | ||
GB0305352A GB0305352D0 (en) | 2003-03-08 | 2003-03-08 | Hall effect sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004079385A1 true WO2004079385A1 (en) | 2004-09-16 |
Family
ID=9954399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2004/000637 WO2004079385A1 (en) | 2003-03-08 | 2004-03-08 | Hall effect sensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1604219B1 (en) |
GB (1) | GB0305352D0 (en) |
WO (1) | WO2004079385A1 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7631885B2 (en) | 2007-04-16 | 2009-12-15 | Harley-Davidson Motor Company Group, LLC | Intelligent interlock for a motorcycle stand |
WO2011078967A1 (en) * | 2009-12-23 | 2011-06-30 | Measurement Specialties, Inc. | Encoder using magnet drop out feature for theft detection |
WO2014149238A1 (en) * | 2013-03-15 | 2014-09-25 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can store a measured threshold value in a memory device during a time when the magnetic field sensor is powered off |
CN104204730A (en) * | 2012-03-01 | 2014-12-10 | 泰科电子Amp有限责任公司 | Method for contactlessly measuring a relative position by means of a 3D hall sensor having measurement signal store |
EP2659232B1 (en) | 2010-12-27 | 2015-03-04 | Robert Bosch GmbH | Method and apparatus for determining a recognition threshold |
CN104613989A (en) * | 2013-11-05 | 2015-05-13 | 日本电产三协株式会社 | Encoder |
WO2017045747A1 (en) * | 2015-09-18 | 2017-03-23 | Continental Automotive France | Method for automatic calibration of a camshaft sensor for a motor vehicle |
US9638548B2 (en) | 2012-05-07 | 2017-05-02 | Infineon Technologies Ag | Output switching systems and methods for magnetic field sensors |
US9644999B2 (en) | 2012-01-06 | 2017-05-09 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device |
CN106931929A (en) * | 2017-04-28 | 2017-07-07 | 北京锦鸿希电信息技术股份有限公司 | Wheel diameters detection method and system based on many lobe models |
US10102992B2 (en) | 2014-02-25 | 2018-10-16 | Infineon Technologies Ag | Switching apparatus, switching system and switching method |
CN109084671A (en) * | 2018-08-01 | 2018-12-25 | 中国煤炭科工集团太原研究院有限公司 | A kind of coal mine crawler-type traveling equipment stroke measurment system |
US10430296B2 (en) | 2017-09-29 | 2019-10-01 | Allegro Microsystems, Llc | Circuit and method for storing information in non-volatile memory during a loss of power event |
US10839920B2 (en) | 2017-09-29 | 2020-11-17 | Allegro Microsystems, Llc | Circuit having a low power charge pump for storing information in non-volatile memory during a loss of power event |
US10845434B2 (en) | 2012-01-06 | 2020-11-24 | Allegro Microsystems, Llc | Magnetic field sensor having a temperature compensated threshold on power up |
CN112747664A (en) * | 2020-12-30 | 2021-05-04 | 苏州博古特智造有限公司 | Linear magnetic resistance position sensor |
DE112015002417B4 (en) | 2014-10-07 | 2022-02-03 | Hyundai Kefico Corporation | Device and method for controlling a rotor detection sensor for a rotor with a run-out error |
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2003
- 2003-03-08 GB GB0305352A patent/GB0305352D0/en not_active Ceased
-
2004
- 2004-03-08 EP EP04718356.1A patent/EP1604219B1/en not_active Expired - Lifetime
- 2004-03-08 WO PCT/IB2004/000637 patent/WO2004079385A1/en active Search and Examination
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US6242908B1 (en) * | 1996-01-17 | 2001-06-05 | Allegro Microsystems, Inc. | Detection of passing magnetic articles while adapting the detection threshold |
US6064199A (en) * | 1998-02-23 | 2000-05-16 | Analog Devices, Inc. | Magnetic field change detection circuitry having threshold establishing circuitry |
US6404188B1 (en) | 1998-03-19 | 2002-06-11 | Honeywell Inc | Single geartooth sensor yielding multiple output pulse trains |
WO2001022037A1 (en) * | 1999-09-17 | 2001-03-29 | Melexis N.V. | Multi-mode hall-effect sensor |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7631885B2 (en) | 2007-04-16 | 2009-12-15 | Harley-Davidson Motor Company Group, LLC | Intelligent interlock for a motorcycle stand |
WO2011078967A1 (en) * | 2009-12-23 | 2011-06-30 | Measurement Specialties, Inc. | Encoder using magnet drop out feature for theft detection |
CN102812325A (en) * | 2009-12-23 | 2012-12-05 | 精量电子(美国)有限公司 | Encoder Using Magnet Drop Out Feature For Theft Detection |
US8441254B2 (en) | 2009-12-23 | 2013-05-14 | Measurement Specialties, Inc. | Encoder using magnet drop out feature for theft detection |
EP2659232B1 (en) | 2010-12-27 | 2015-03-04 | Robert Bosch GmbH | Method and apparatus for determining a recognition threshold |
US10845434B2 (en) | 2012-01-06 | 2020-11-24 | Allegro Microsystems, Llc | Magnetic field sensor having a temperature compensated threshold on power up |
US10066965B2 (en) | 2012-01-06 | 2018-09-04 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device |
US9644999B2 (en) | 2012-01-06 | 2017-05-09 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device |
CN104204730A (en) * | 2012-03-01 | 2014-12-10 | 泰科电子Amp有限责任公司 | Method for contactlessly measuring a relative position by means of a 3D hall sensor having measurement signal store |
CN104204730B (en) * | 2012-03-01 | 2016-08-17 | 泰连德国有限公司 | The method measuring relative position non-contactly by means of 3D Hall element |
US9638548B2 (en) | 2012-05-07 | 2017-05-02 | Infineon Technologies Ag | Output switching systems and methods for magnetic field sensors |
EP3696513A1 (en) * | 2013-03-15 | 2020-08-19 | Allegro MicroSystems, LLC | Magnetic field sensor and associated method that can store a measured threshold value in a memory device during a time when the magnetic field sensor is powered off |
US11009565B2 (en) | 2013-03-15 | 2021-05-18 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can store a measured threshold value in a memory device during a time when the magnetic field sensor is powered off |
WO2014149238A1 (en) * | 2013-03-15 | 2014-09-25 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can store a measured threshold value in a memory device during a time when the magnetic field sensor is powered off |
US9395391B2 (en) | 2013-03-15 | 2016-07-19 | Allegro Microsystems, Llc | Magnetic field sensor and associated method that can store a measured threshold value in a memory device during a time when the magnetic field sensor is powered off |
CN104613989A (en) * | 2013-11-05 | 2015-05-13 | 日本电产三协株式会社 | Encoder |
US10102992B2 (en) | 2014-02-25 | 2018-10-16 | Infineon Technologies Ag | Switching apparatus, switching system and switching method |
DE112015002417B4 (en) | 2014-10-07 | 2022-02-03 | Hyundai Kefico Corporation | Device and method for controlling a rotor detection sensor for a rotor with a run-out error |
CN108027252A (en) * | 2015-09-18 | 2018-05-11 | 法国大陆汽车公司 | The method calibrated automatically for the camshaft-signal sensor of the engine of motor vehicles |
KR20180053394A (en) * | 2015-09-18 | 2018-05-21 | 콘티넨탈 오토모티브 프랑스 | Automatic calibration method of camshaft sensor for automobile |
US10267657B2 (en) | 2015-09-18 | 2019-04-23 | Continental Automotive France | Method for automatic calibration of a camshaft sensor for a motor vehicle |
FR3041426A1 (en) * | 2015-09-18 | 2017-03-24 | Continental Automotive France | AUTOMATIC CALIBRATION METHOD OF CAMSHAFT SENSOR FOR MOTOR VEHICLE ENGINE |
KR102081010B1 (en) * | 2015-09-18 | 2020-02-24 | 콘티넨탈 오토모티브 프랑스 | Automatic calibration method of camshaft sensor for automobile |
WO2017045747A1 (en) * | 2015-09-18 | 2017-03-23 | Continental Automotive France | Method for automatic calibration of a camshaft sensor for a motor vehicle |
CN106931929B (en) * | 2017-04-28 | 2019-06-18 | 北京锦鸿希电信息技术股份有限公司 | Wheel diameters detection method and system based on more lobe models |
CN106931929A (en) * | 2017-04-28 | 2017-07-07 | 北京锦鸿希电信息技术股份有限公司 | Wheel diameters detection method and system based on many lobe models |
US10430296B2 (en) | 2017-09-29 | 2019-10-01 | Allegro Microsystems, Llc | Circuit and method for storing information in non-volatile memory during a loss of power event |
US10929252B2 (en) | 2017-09-29 | 2021-02-23 | Allegro Microsystems, Llc | Circuit and method for storing information in non-volatile memory during a loss of power event |
US10839920B2 (en) | 2017-09-29 | 2020-11-17 | Allegro Microsystems, Llc | Circuit having a low power charge pump for storing information in non-volatile memory during a loss of power event |
US11467928B2 (en) | 2017-09-29 | 2022-10-11 | Allegro Microsystems, Llc | Circuit and method for storing information in non-volatile memory during a loss of power event |
CN109084671A (en) * | 2018-08-01 | 2018-12-25 | 中国煤炭科工集团太原研究院有限公司 | A kind of coal mine crawler-type traveling equipment stroke measurment system |
CN109084671B (en) * | 2018-08-01 | 2024-06-04 | 中国煤炭科工集团太原研究院有限公司 | Travel measurement system for crawler-type walking equipment of coal mine |
CN112747664A (en) * | 2020-12-30 | 2021-05-04 | 苏州博古特智造有限公司 | Linear magnetic resistance position sensor |
CN112747664B (en) * | 2020-12-30 | 2022-06-17 | 苏州博古特智造有限公司 | Linear magnetic resistance position sensor |
Also Published As
Publication number | Publication date |
---|---|
EP1604219A1 (en) | 2005-12-14 |
EP1604219B1 (en) | 2017-12-13 |
GB0305352D0 (en) | 2003-04-16 |
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