CN106524887B - The method and device of Hall sensor measurement displacement - Google Patents
The method and device of Hall sensor measurement displacement Download PDFInfo
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- CN106524887B CN106524887B CN201510581992.6A CN201510581992A CN106524887B CN 106524887 B CN106524887 B CN 106524887B CN 201510581992 A CN201510581992 A CN 201510581992A CN 106524887 B CN106524887 B CN 106524887B
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Abstract
The embodiment of the present invention provides a kind of method and device of Hall sensor measurement displacement, which comprises for measurement measurand in the Magnetic Field of current location, the Magnetic Field includes the second information of the magnetic field first information and magnetic field；Displacement of the current location relative to predeterminated position of the measurand is obtained according to the magnetic field first information；Displacement of the current location relative to predeterminated position for correcting the measurand obtains displacement of the current location relative to predeterminated position of the measurand, and as measurement result.The precision of Hall sensor measurement displacement can be improved using the above method.
Description
Technical field
The present invention relates to Hall-type position measurement technique field more particularly to a kind of methods of Hall sensor measurement displacement
And device.
Background technique
Hall effect then occurs when there is the magnetic field perpendicular to electric current, Hall effect is according to American physicist
The naming of Edwin Herbert Hall (1855-1938).In this case, magnetic field is both perpendicular to magnetic direction
Again perpendicular to the potential difference for generating referred to as Hall voltage on the direction of current direction.By measuring Hall voltage, can determine
The size of magnetic-field component.
In the prior art, it can use Hall sensor measurement magnetic field angle, and then measure measurand displacement.Because institute
Stating between Hall sensor and the measurand has gap, so this is a kind of non-contacting displacement measurement mode, between described
The size of gap is determined that there are a biggish tolerance ranges by the assembly precision of measurand system.
But it this may result in reducing the precision of Hall sensor measurement displacement in this way.
Summary of the invention
Problems solved by the invention is to improve the precision of Hall sensor measurement displacement.
To solve the above problems, the embodiment of the present invention provides a kind of method of Hall sensor measurement displacement, the method
Include:
Measurand is measured in the Magnetic Field of current location, the Magnetic Field includes the magnetic field first information and magnetic field the
Two information；
Displacement of the current location relative to predeterminated position of the measurand is obtained according to the magnetic field first information；
Displacement of the current location relative to predeterminated position for correcting the measurand, obtains the current of the measurand
Displacement of the position relative to predeterminated position, and as measurement result.
Optionally, the method for Hall sensor measurement displacement, further includes:
The measurand is obtained described relative to the displacement of predeterminated position according to the current location of the measurand
Preset second information in the magnetic field of current location；
The current location of the amendment measurand includes: to be obtained according to measurement relative to the displacement of predeterminated position
The measurand current location the second information of magnetic field and the measurand current location preset magnetic field second
The relationship of information corrects displacement of the current location relative to predeterminated position of the measurand.
Optionally, the magnetic field first information includes: magnetic field angle of the measurand in current location.
Optionally, second information of magnetic field includes: magnetic field strength of the measurand in current location.
Optionally, displacement of the current location of the amendment measurand relative to predeterminated position, comprising: pass through benefit
Repay displacement of the current location relative to predeterminated position that function corrects the measurand.
Optionally, the penalty function includes following one of which: polynomial function, exponential function, logarithmic function.
Optionally, displacement of the current location of the amendment measurand relative to predeterminated position, comprising: pass through one
Secondary function corrects displacement of the current location relative to predeterminated position of the measurand.
The embodiment of the invention also provides a kind of device of Hall sensor measurement displacement, described device includes:
Measuring unit, suitable for measuring measurand in the Magnetic Field of current location, the Magnetic Field includes magnetic field the
The second information of one information and magnetic field；
First computing unit, the magnetic field first information suitable for the measurement according to the measuring unit obtain described be tested
Displacement of the current location of object relative to predeterminated position；
Amending unit, suitable for correcting the current location of the measurand relative to the displacement of predeterminated position and being corrected
Displacement of the current location of the measurand afterwards relative to predeterminated position, as measurement result.
Optionally, the device of Hall sensor measurement displacement, further includes: the second computing unit is suitable for according to described tested
The current location of object is pre- in the magnetic field of the current location relative to the first displacement acquisition measurand of predeterminated position
If the second information；
The amending unit, suitable for according to the obtained measurand of measurement current location the second information of magnetic field with
The measurand corrects the current location phase of the measurand in the relationship of the second information of preset magnetic field of current location
Displacement for predeterminated position.
Optionally, the magnetic field first information includes: magnetic field angle of the measurand in current location.
Optionally, second information of magnetic field includes: magnetic field strength of the measurand in current location.
Optionally, the amending unit, suitable for corrected by penalty function the current location of the measurand relative to
The displacement of predeterminated position.
Compared with prior art, technical solution of the present invention has the advantage that
According to the magnetic field first information obtain the current location of the measurand relative to predeterminated position displacement it
Afterwards, by being modified to the displacement, the current location of the revised measurand is obtained relative to predeterminated position
Displacement be used as measurement result, can to avoid the displacement measurement result by between Hall sensor and the measurand
The influence in gap, so as to improve the precision of Hall sensor measurement displacement, and need not be to the Hall sensor and described
Measurand increases additional hardware, so that the structure of the Hall sensor and the measurand is easier, together
When also reduce cost.But also can reduce the size of induced magnet, so as to reduce the structure size of measurand.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of a scenario being displaced according to magnetic field angle in the prior art；
Fig. 2 is another schematic diagram of a scenario being displaced according to magnetic field angle in the prior art；
Fig. 3 is the flow chart of the method for one of embodiment of the present invention Hall sensor measurement displacement；
Fig. 4 is one of embodiment of the present invention penalty function schematic diagram；
Fig. 5 is the structural schematic diagram of the device of one of embodiment of the present invention Hall sensor measurement displacement；
Fig. 6 is the structural schematic diagram of the device of another Hall sensor measurement displacement in the embodiment of the present invention.
Specific embodiment
In the prior art, using the method for Hall sensor measurement displacement, including measured according to magnetic field strength displacement and
Displacement both methods is measured according to magnetic field angle.Wherein, the method that displacement is measured according to magnetic field strength, including use one
A hall sensing element judges the magnetic field strength on a direction.It is displaced according to magnetic field angle, including uses two Halls
Element, the magnetic field strength measured in both direction carry out calculating magnetic field angle.Root is compared according to the method for magnetic field angle displacement
There is better precision for method according to magnetic field strength measurement displacement.
However, there is very big fluctuation range in the gap between Hall sensor and testee in the occasion of batch production,
The fluctuation range will affect the precision of Hall sensor measurement displacement.
With reference to it is shown in fig. 1 it is in the prior art it is a kind of according to magnetic field angle be displaced schematic diagram of a scenario said
It is bright.As shown in Figure 1, the component that the scene includes are as follows: Hall sensor 100 and induced magnet 102.In specific implementation, quilt
Object is surveyed to become one with the induced magnet 102.101 between the Hall sensor 100 and the induced magnet 102
Gap, the also gap as between Hall sensor 100 and the measurand.103 be the movement travel of induced magnet,
It is just the movement travel of the measurand.
Wherein, the Hall sensor 100 has been internally integrated two Hall elements, can perceive BXAnd ByIn both direction
Magnetic field, be so as to obtain the size of resultant magnetic field intensity | B |, the resultant magnetic field intensity and ByAngle is α.Institute
Induced magnet 102 is stated, for generating induced magnetic field.In high volume production process, the gap 101 is not a definite value, and
It is to have a tolerance range.
Below with reference to Fig. 2 shows another schematic diagram of a scenario according to magnetic field angle displacement the sky is described in detail
Influence of the tolerance range of gap 101 to the measurement result of displacement measurement.
If as shown in Fig. 2, defining both direction, respectively X-axis and Y-axis.The wherein institute that the displacement of X-axis measures for needs
State displacement of the measurand relative to predeterminated position, the displacement of Y-axis is the Hall sensor and the induced magnet 102,
Gap between the as described measurand.201 benchmark between the Hall sensor 100 and the induced magnet 102
Interstitial site, as previously mentioned, the interstitial site has a floating range, 202 be the Hall sensor 100 and the induction
Minimum gap location between magnet 102, between 200 maximum between the Hall sensor 100 and the induced magnet 102
Gap position, i.e., the described interstitial site are floated between the minimum gap location 202 and the maximal clearance position 200.203 are
Displacement of the measurand relative to predeterminated position.A, there is the identical measurand relative to predeterminated position for 3 points of b, c
Displacement 203, αa、αb、αcRespectively resultant magnetic field is magnetic line of force direction and ByFormed angle, correspondingly, | Ba|、|Bb|、|Bc
| for the size of the resultant magnetic field intensity at 3 point of a, b, c.
Displacement S of the measurand relative to predeterminated position is measured using magnetic field angle α, can use following relationship
Formula: S=f (α).Benchmark event position 201 between the Hall sensor 100 and the induced magnet 102, can pass through
The coefficient of multiple point calibration f (α) is acquired, then the value of f (α) can be calculated, to obtain institute according to the value of magnetic field angle α
State value of the measurand relative to the displacement S of predeterminated position.
Ideally, the fixed interval (FI) of the Hall sensor and the induced magnet 102 should be the hall sensing
Benchmark event position 201 between device 100 and the induced magnet 102.The Hall sensor is exactly according between the benchmark
What gap position 201 was demarcated, therefore in practical set, if the Hall sensor falls in the benchmark event position 201,
Measurement accuracy using Hall sensor measurement displacement is very high.But if because the deviation of practical set leads to the Hall
Interstitial site between sensor and the induced magnet 102 deviates from the benchmark event position 201, for example, cause it is described suddenly
Interstitial site between that sensor and the induced magnet 102 is the minimum gap location 202, then the displacement measured will
Generate accuracy error.And in different interstitial sites, because the value of magnetic field angle α will be different, the measurement position
The method of shifting will necessarily generate accuracy error.
For example, shown in Fig. 23 points of a, b, c have displacement of the identical measurand relative to predeterminated position
203, but because the Hall sensor of Y-direction is different from the gap between the induced magnet 102, lead to position
Magnetic field angle αa、αb、αcIt is not identical, as previously mentioned, if showing that the measurand is opposite according to the relational expression of S=f (α)
In the value of the displacement S of predeterminated position, the displacement S is to have precision relative to the actual displacement of predeterminated position with the measurand
Deviation.But because
It can be obtained by analysis, the magnetic field angle α of 3 positions a, b, ca、αb、αcSize relation be αa<αb<
αc, correspondingly, the resultant magnetic field intensity size relation at 3 point of a, b, c is | Ba|<|Bb|<|Bc|.It can be seen that can be with
The tolerance clearance bring magnetic field between the Hall sensor and the induced magnet 102 is compensated using magnitude of field intensity
Angular deviation.
For in the prior art, the precision of Hall sensor measurement displacement is by between Hall sensor and measurand
The influence of tolerance clearance and the problem of reduce.A kind of method of Hall sensor measurement displacement is provided in the embodiment of the present invention,
After obtaining the current location of the measurand relative to the displacement of predeterminated position according to the magnetic field first information, pass through
The displacement is modified, displacement conduct of the current location relative to predeterminated position of the revised measurand is obtained
Measurement result, can be to avoid shadow of the measurement result by the gap between Hall sensor and the measurand of the displacement
It rings, so as to improve the precision of Hall sensor measurement displacement, and need not be to the Hall sensor and the measurand
Increase additional hardware, so that the structure of the Hall sensor and the measurand is easier, while also reducing
Cost.But also can reduce the size of induced magnet, so as to reduce the structure size of measurand.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Fig. 3 shows the method for one of embodiment of the present invention Hall sensor measurement displacement, it will be seen from figure 1 that
The method may include following 3 steps:
S301: measurement measurand current location Magnetic Field, the Magnetic Field include the magnetic field first information and
The second information of magnetic field.
In specific implementation, if measuring side of the current location relative to the displacement of predeterminated position using Hall sensor
Method can measure measurand in the Magnetic Field of current location, and the Magnetic Field includes the magnetic field first information and magnetic field
Two information.
In an embodiment of the present invention, the magnetic field first information includes: magnetic field angle of the measurand in current location.
In an embodiment of the present invention, second information of magnetic field includes: magnetic field strength of the measurand in current location.
S302: position of the current location relative to predeterminated position of the measurand is obtained according to the magnetic field first information
It moves.
In specific implementation, can be obtained according to the magnetic field first information current location of the measurand relative to
The displacement of predeterminated position.
In an embodiment of the present invention, the present bit of the measurand can be obtained according to the magnetic field angle in the magnetic field
Set the displacement relative to predeterminated position.
For example, if in step S301, two Hall elements of Hall sensor measure measurand at two respectively
Magnetic field strength on direction X and Y is | Bx|=3T and | By|=4T, then the measurand is strong in the resultant magnetic field of current location
Spending size is | BIt surveys|=5T, magnetic field angle α=53 °.It then in step s 302 can be according to the magnetic field angle α of the resultant magnetic field
=53 °, obtain displacement S of the current location relative to predeterminated position of the measurand1=f (α).
S303: displacement of the current location relative to predeterminated position of the measurand is corrected, the measurand is obtained
Displacement of the current location relative to predeterminated position, and as measurement result.
In specific implementation, displacement of the current location relative to predeterminated position that can correct the measurand, obtains
Displacement of the current location of the measurand relative to predeterminated position, and as measurement result.
It in an embodiment of the present invention, can displacement according to the current location of the measurand relative to predeterminated position
The measurand is obtained in preset second information in magnetic field of the current location, and is obtained according to measurement described tested pair
As in current location the second information of magnetic field and the measurand the second information of preset magnetic field of current location relationship,
Displacement of the current location relative to predeterminated position of the measurand is corrected, the current location for obtaining the measurand is opposite
In the displacement of predeterminated position, and as measurement result.
For example, can displacement S according to the current location of the measurand relative to predeterminated position1=f (α) obtains institute
Stating magnetic field preset magnitude of field intensity of the measurand in the current location is | BIn advance|=4T, and the institute obtained according to measurement
Measurand is stated in the magnitude of field intensity of current location | BIt surveysPreset magnetic of the |=5T with the measurand in current location
Field intensity size | BIn advanceRelationship between |=4T corrects displacement S of the current location relative to predeterminated position of the measurand1
=f (α) obtains displacement S of the current location relative to predeterminated position of the revised measurand, and using S as described in
The displacement measurement of measurand.
In specific implementation, the current location of the measurand can be corrected by penalty function relative to predeterminated position
Displacement.
In specific implementation, the penalty function includes following one of which: polynomial function, exponential function, logarithm letter
Number.
In an embodiment of the present invention, the current location of the measurand can be corrected by linear function relative to pre-
If the displacement of position.
For example, penalty function COMP (B, S can be passed through1) current location of the measurand is corrected relative to default position
The displacement S set1=f (α) obtains displacement S=S of the current location relative to predeterminated position of the revised measurand1+
COMP (B, S1), and using S as the displacement measurement of the measurand.Wherein, penalty function COMP (B, the S1) can be with
For one of them in polynomial function, exponential function, logarithmic function.
In an embodiment of the present invention, penalty function COMP (B, the S1)=K* (| BIt surveys|-|BIn advance|).Compensation can be passed through
Function COMP (B, S1)=K* (| BIt surveys|-|BIn advance|) the amendment displacement S1=f (α), obtains working as the revised measurand
Displacement of the front position relative to predeterminated position: S=S1+K*(|BIt surveys|-|BIn advance|), and using S as displacement measurement.By adjusting
The size of COEFFICIENT K adjusts the degree of compensation, and the size of the COEFFICIENT K occurrence can be by theoretical calculation or to do experiment true
Fixed, the COEFFICIENT K is constant.
Fig. 4 shows one of embodiment of the present invention penalty function figure.Below in conjunction with Fig. 4 and Fig. 2, it is discussed in detail at this
It invents in an embodiment through the process of penalty function compensation displacement.As shown in figure 4, in the interstitial site of the Hall sensor
When for benchmark interstitial site 201, using the measurand relative to predeterminated position displacement S as abscissa X, the displacement S's
Unit is millimeter (mm)；Respectively with the magnetic field angle α and default magnetic field strength | B | be ordinate Y, the magnetic field angle α and
Default magnetic field strength | B | unit be respectively to spend (°) and milli tesla (mT).
Assuming that the magnetic field angle α and default magnetic field strength | B | the displacement S with the measurand relative to predeterminated position
There are relationships represented by relation curve 300 and 302 as shown in Figure 4.First by magnetic field angle α curve 300 and magnetic field strength |
B | curve 302 linearly turns to curve 301 and curve 303 respectively.Defining curve 301 respectively is function S1=f (α), curve 303 are
Function | BIn advance|=g (S1)。
When benchmark event position 201 is demarcated, believed using the method storage tape intensity of linearisation, angle
, that is, there is S in breath1=f (α) and | BIn advance|=g (S1) two functions.During actually detected displacement, measure first described tested
Object the current location at place magnetic field angle α, then according to the magnetic field angle α and utilize function S1=f (α) calculates institute
State displacement S of the current location relative to predeterminated position of measurand1.Later to the current location of the measurand relative to
The displacement S of predeterminated position1Carry out following relational expression compensation, S=S1+ COMP (B, S1)。
Wherein COMP (B, S1)=K* (| BIt surveys|-|g(S1) |), | BIt surveys| it is the size of current resultant magnetic field intensity, g (S1) i.e.
For curve 303, the resultant magnetic field intensity size of calibration position is indicated.The degree of the adjustable compensation of the size of COEFFICIENT K, occurrence
Size can with theoretical calculation or do experiment determine.K can not also be constant, for example can be the linear function of displacement, this
When be equivalent to penalty function COMP (| B |, S1) from S1Function of first order evolve be multi-order function.
By position of the current location relative to predeterminated position for obtaining the measurand according to the magnetic field first information
After shifting, and the displacement is modified, obtains the current location of the revised measurand relative to predeterminated position
Displacement, and as measurement result.Can to avoid the displacement measurement result by Hall sensor and the measurand
Between gap influence, so as to improve Hall sensor measurement displacement precision.
In order to enable those skilled in the art more fully understand and realize the present invention, phase is additionally provided in the embodiment of the present invention
The information processing unit answered.Referring to the drawings, it is described in detail by specific embodiment.
Fig. 5 shows the device 500 of one of embodiment of the present invention Hall sensor measurement displacement, described device 500
It include: measuring unit 501, the first computing unit 502 and amending unit 503, in which:
The measuring unit 501, suitable for measuring measurand in the Magnetic Field of current location, the Magnetic Field includes
The second information of the magnetic field first information and magnetic field；
First computing unit 502, the magnetic field first information suitable for being measured according to the measuring unit obtain institute
State displacement of the current location relative to predeterminated position of measurand；
The amending unit 503, suitable for correct the current location of the measurand relative to predeterminated position displacement simultaneously
Displacement of the current location of the revised measurand relative to predeterminated position is obtained, as measurement result.
In specific implementation, the magnetic field first information includes: magnetic field angle of the measurand in current location.
In specific implementation, second information of magnetic field includes: magnetic field strength of the measurand in current location.
In an embodiment of the present invention, the amending unit 503, suitable for correcting the measurand by penalty function
Displacement of the current location relative to predeterminated position, the penalty function include following one of which: polynomial function, index letter
Number, logarithmic function.For example, the amending unit can be corrected by linear function the current location of the measurand relative to
The displacement of predeterminated position.
Fig. 6 shows the device 600 of the measurement displacement of another Hall sensor in the embodiment of the present invention, and shows in Fig. 5
Device 500 out is compared, and other than the measuring unit 501, the first computing unit 502 and amending unit 503, the Hall is passed
The device 600 of sensor measurement displacement can also include: the second computing unit 601.
Described second calculates single 601 first suitable for the current location according to the measurand relative to predeterminated position
It moves and obtains the measurand in preset second information in magnetic field of the current location.
The amending unit 503, the measurand suitable for being obtained according to measurement are believed in the magnetic field second of current location
Breath, in the relationship of the second information of preset magnetic field of current location, corrects the present bit of the measurand with the measurand
Set the displacement relative to predeterminated position.
It is calculated and is obtained according to the magnetic field first information that the measuring unit 501 measures by first computing unit 502
After the current location of the measurand is relative to the displacement of predeterminated position, the amending unit 503 again to it is described be displaced into
Row is corrected and obtains displacement of the current location of the revised measurand relative to predeterminated position, as measurement result.
It can be influenced to avoid the measurement result of the displacement by the gap between Hall sensor and the measurand, so as to
To improve the precision of Hall sensor measurement displacement.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can store in computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (6)
1. a kind of method of Hall sensor measurement displacement characterized by comprising
Measurand is measured in the Magnetic Field of current location, the Magnetic Field includes that the magnetic field first information and magnetic field second are believed
Breath；
Displacement of the current location relative to predeterminated position of the measurand is obtained according to the magnetic field first information；
Displacement of the current location relative to predeterminated position for correcting the measurand obtains the revised measurand
Displacement of the current location relative to predeterminated position, and as measurement result；
Further include:
The measurand is obtained described current relative to the displacement of predeterminated position according to the current location of the measurand
Preset second information in the magnetic field of position；
The current location of the amendment measurand includes: according to measuring and obtain relative to the displacement of predeterminated position
Measurand current location the second information of magnetic field and the measurand current location the second information of preset magnetic field
Relationship, correct displacement of the current location relative to predeterminated position of the measurand；
The magnetic field first information includes: magnetic field angle of the measurand in current location；
Second information of magnetic field includes: magnetic field strength of the measurand in current location；
When benchmark event position is demarcated, according to S1=f (α) and | BIn advance|=g(S1) two function storage tape intensity and angle letter
Breath；
Maximal clearance position and minimum clearance position of the benchmark event position between the Hall sensor and induced magnet
The middle position set；
α is magnetic field angle, BIn advanceTo preset magnetic field strength, S1Displacement for measurand relative to predeterminated position, measurand and institute
Induced magnet is stated to become one.
2. the method for Hall sensor measurement displacement according to claim 1, which is characterized in that the amendment is described tested
Displacement of the current location of object relative to predeterminated position, comprising: the present bit of the measurand is corrected by penalty function
Set the displacement relative to predeterminated position.
3. the method for Hall sensor according to claim 2 measurement displacement, which is characterized in that the penalty function includes
Following one of which: polynomial function, exponential function, logarithmic function.
4. the method for Hall sensor measurement displacement according to claim 3, which is characterized in that the amendment is described tested
Displacement of the current location of object relative to predeterminated position, comprising: the present bit of the measurand is corrected by linear function
Set the displacement relative to predeterminated position.
5. a kind of device of Hall sensor measurement displacement, based on the described in any item Hall sensor measurements of claim 1-4
The method of displacement characterized by comprising
Measuring unit, suitable for measuring measurand in the Magnetic Field of current location, the Magnetic Field includes that magnetic field first is believed
Breath and the second information of magnetic field；
First computing unit, the magnetic field first information suitable for the measurement according to the measuring unit obtain the measurand
Displacement of the current location relative to predeterminated position；
Amending unit, suitable for correcting the current location of the measurand relative to the displacement of predeterminated position and obtaining revised
Displacement of the current location of the measurand relative to predeterminated position, as measurement result；
Further include: the second computing unit, first suitable for the current location according to the measurand relative to predeterminated position
It moves and obtains the measurand in preset second information in magnetic field of the current location；
The amending unit, suitable for according to the obtained measurand of measurement current location the second information of magnetic field with it is described
Measurand in the relationship of the second information of preset magnetic field of current location, correct the current location of the measurand relative to
The displacement of predeterminated position；
The magnetic field first information includes: magnetic field angle of the measurand in current location；
Second information of magnetic field includes: magnetic field strength of the measurand in current location.
6. the device of Hall sensor measurement displacement according to claim 5, which is characterized in that the amending unit is fitted
In displacement of the current location relative to predeterminated position for correcting the measurand by penalty function.
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| CN107421432B (en) * | 2017-06-16 | 2023-12-01 | 上海同驭汽车科技有限公司 | Non-contact Hall displacement sensor |
| CN109916287B (en) * | 2019-01-30 | 2020-11-27 | 西安维控自动化科技有限公司 | Planar displacement sensor based on magnetic induction, displacement detection method and system |
| CN112325755A (en) * | 2020-11-03 | 2021-02-05 | 上海艾为电子技术股份有限公司 | Position sensing system, method for acquiring position sensing signal and electronic equipment |
| CN113776416B (en) * | 2021-08-27 | 2024-02-06 | 浙江沃德尔科技集团股份有限公司 | Detection device for non-contact pedal position resisting magnetic field interference |
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