CN105547142B - For detecting the sensor module of the rotation angle at rotating member - Google Patents

For detecting the sensor module of the rotation angle at rotating member Download PDF

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Publication number
CN105547142B
CN105547142B CN201510887377.8A CN201510887377A CN105547142B CN 105547142 B CN105547142 B CN 105547142B CN 201510887377 A CN201510887377 A CN 201510887377A CN 105547142 B CN105547142 B CN 105547142B
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frequency
signal
measured value
assessment
sensor module
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CN201510887377.8A
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CN105547142A (en
Inventor
S·莱迪希
F·亨里齐
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D15/00—Steering not otherwise provided for
    • B62D15/02—Steering position indicators ; Steering position determination; Steering aids
    • B62D15/021—Determination of steering angle
    • B62D15/0215—Determination of steering angle by measuring on the steering column
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
    • 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
    • G01D5/02—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 mechanical means
    • G01D5/04—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 mechanical means using levers; using cams; using gearing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • 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
    • G01D5/2451—Incremental encoders
    • 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
    • G01D5/2451—Incremental encoders
    • G01D5/2452—Incremental encoders incorporating two or more tracks having an (n, n+1, ...) relationship
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/20—Detecting rotary movement
    • G01D2205/26—Details of encoders or position sensors specially adapted to detect rotation beyond a full turn of 360°, e.g. multi-rotation
    • 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
    • G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents

Abstract

The present invention relates to a kind of for detecting the sensor module of the rotation angle at rotating member, which is included the first measured value transmitter (10), coupled at circumference with scheduled first speed ratio and rotating member (3)；Second measured value transmitter (20), it is coupled at circumference with scheduled second speed ratio and rotating member (3), wherein the first measured value transmitter (10) and the first measured value receiver (30), which combine, generates first angle information (α 1), second measured value transmitter (20) and the second measured value receiver (40), which combine, generates second angle information (α 2), the two angle informations can be evaluated for determining the current rotation angle (α) of rotating member (3).According to the present invention, first angle information (α 1) is converted into first frequency signal and second angle information (α 2) is converted into second frequency signal and generates output signal, the current rotation angle (α) of the output signal representative rotating member (3) by the two frequency signals by assessment and control unit (50).

Description

For detecting the sensor module of the rotation angle at rotating member
Technical field
The present invention relates to a kind of types according to independent claims 1 for detecting in rotation structure especially in the car The sensor module of rotation angle at part.
Background technique
In known steering angle sensor, in order to determine the rotation number of deflecting roller (Lenkrad), contactlessly by Magnetic field sensor detects counter wheel.This system has disadvantages in that must provide Static Electro in the case where ignition-off Stream, to can recognize the rotation of deflecting roller in the case where ignition-off.In the case where lasting unused vehicle, this leads to institute Undesirably it is vented the battery of vehicle.If not providing such quiescent current, when ignition-off or battery is interrupted In the case where deflecting roller be no longer able to clearly determine steering angle when rotating.
There are two the new steered wheel angle measuring systems of angular transducer to provide a kind of improvement project for band, the two angles Sensor is according to modified cursor principle (Noniusprinzip) work and no longer has the shortcomings that provide quiescent current.
Thus, for example 195 06 938 A1 of file DE disclose it is a kind of for measuring the side of the angle of rotatable object Method and device.Here, the rotatable object at circumference at least two other rotatable object collective effects.Separately Outer rotatable object is for example implemented as gear, and angle position is determined by two sensors.Then attached by the two The so determining angle position of the rotatable object added can determine the angle position of rotatable object.It is bright in order to obtain True conclusion, needing all three rotatable objects, more specifically gear is respectively provided with the determining number of teeth or transmission ratio. This method and device for example can be used for determining the steering angle of motor vehicle.The measuring principle can be applied to any kind of angle Sensor, such as optical sensor, Magnetic Sensor, capacitance type sensor, inductance type transducer or resistance sensor.This In, which works as measured value transmitter, and corresponding sensor is as measured value receiver It works.
Summary of the invention
Feature according to the present invention with independent claims 1 is used to detect in rotating member especially in the car The sensor module of the rotation angle at place has the advantages that this in contrast: by believing the angle of at least two measured value transmitters Breath be converted into corresponding frequency signal can simply and quickly assessment signal for determining current rotation angle.In addition, being The frequency signal is assessed, existing component in the car can be used.Preferably, the two of frequency signal is formed during assessment The difference of a frequency and as vernier signal (Noniussignal) use.The vernier signal then clearly states rotation Position of the component even across multiple rotations.The formation of difference is for example carried out by the mixing of frequency signal and/or counting.
Embodiment according to the present invention for detecting the sensor module of the rotation angle at rotating member is for example Steering angle sensor be can be used as determining the steering angle of vehicle and/or in Industry Control.
Embodiments of the present invention provide a kind of rotation angle for detecting at rotating member especially in the car The sensor module of degree.Here, the first measured value transmitter is coupled with scheduled first speed ratio with rotating member at circumference, And the second measured value transmitter is coupled with scheduled second speed ratio with rotating member at circumference.First measured value transmitter First angle information, and the second measured value transmitter and the second measured value receiver are generated in conjunction with the first measured value receiver In conjunction with second angle information is generated, the two angle informations can be evaluated for determining the current rotation angle of rotating member Degree.According to the present invention, first angle information is converted into first frequency signal and believes second angle by assessment and control unit Breath is converted into second frequency signal and generates output signal by the two frequency signals, the output signal representative rotating member Current rotation angle.
Term " frequency signal " indicates different signals below.Thus, for example with the oscillator of defined hunting of frequency More specifically sinusoidal output signal or resulting rectangular signal with identical frequency or show the vibration The numerical value or meter reading for swinging the number of frequency are all referred to alternatively as frequency signal.
Assessment and control unit can be regarded as circuit or electrical equipment, such as control equipment herein, handle or comment Estimate the sensor signal of detection.Assessment and control unit can have at least one interface, which can be with hardware and/or software Mode constructs.In the case where constructing in hardware, interface may be, for example, a part of so-called system ASIC, it includes The different function of assessment and control unit.However it is also possible that interface be oneself, integrated switching circuit or at least Partly it is made of discrete structural detail.In the case where being constructed with software mode, interface can be software module, such as except It is present on microcontroller except other software module.Also advantageously the computer program product of program code is had, It is stored in machine readable carrier (such as semiconductor memory, harddisk memory or optical memory), and when by commenting Estimate when implementing the program with control unit for executing assessment.
It can be advantageously improved in independent claims 1 by the measure referred in the dependent claims and improvement project What is illustrated is used to detect the sensor module of the rotation angle at rotating member especially in the car.
Particularly advantageously, measured value receiver generates the angle information that changes respectively as inductance, the angle information by Assessment and control unit are converted into frequency signal.
In a kind of advantageous design scheme of sensor module according to the present invention, measured value transmitter can be respectively provided with Disk shaped base at least one conductive metal covering, and measured value receiver can be respectively provided with the detection of at least one face formula Coil.Here, at least one conductive metal covering can influence the inductance of at least one corresponding search coil according to coverage.This Outside, at least one face formula search coil may make up the part that the frequency of the oscillating circuit with scheduled intermediate frequency determines.? This, by the rotation of corresponding measured value transmitter, in scheduled Measurement bandwidth, the inductance variation of face formula search coil can change Become the intermediate frequency of corresponding oscillating circuit.Preferably, oscillating circuit is accordingly implemented as LR oscillator.Angle information is right as a result, After be first converted into inductance change and be then converted into frequency variation.The intermediate frequency of corresponding oscillating circuit is sent out in measured value Device is sent to change in the case where moving between 0 and 360 ° with the Measurement bandwidth of positive/negative half, wherein the Measurement bandwidth is typically bright It is aobvious to be less than intermediate frequency.
In another advantageous design scheme of sensor module according to the present invention, the first face formula search coil is had The first oscillating circuit can have the first intermediate frequency, the second oscillating circuit with the second face formula search coil can have second Intermediate frequency, can be so different from the first intermediate frequency, so that the frequency range of oscillating circuit is in scheduled Measurement bandwidth It is non-overlapping.It is possible thereby to which advantageous mode avoids the sign change or zero passage of output signal or differential signal (Nulldurchgang)。
In another advantageous design scheme of sensor module according to the present invention, assessment circuit can receive oscillation electricity The current intermediate frequency on road as first frequency signal and second frequency signal and by mixing and/or calculate determine this two The difference on the frequency of a frequency signal and as output signal export.Here, assessment circuit analog (analog) mixing The frequency signal of oscillating circuit is filtered using low-pass filter and to the signal-count after low-pass filtering.Then assessment circuit It can be exported the signal of counting as output signal.Alternatively, assessment circuit can be incited somebody to action via at least one analog/digital converter The frequency signal of oscillating circuit digitizes and the frequency signal after hybrid digital, is filtered using low-pass filter and to low Signal-count after pass filter.Here, assessment circuit can also be exported the signal of counting as output signal.As another alternative The frequency signal of oscillating circuit can be converted into rectangular signal by threshold switch and accordingly utilize counting by scheme, assessment circuit Device is to frequency counting.Then assessment circuit digitally forms the difference frequency of two counters and defeated as output signal Out.In a kind of suitable embodiment of abnormal cost, assessment circuit can be by threshold switch by the frequency signal of oscillating circuit It is converted into rectangular signal, is supplied to using the first rectangular signal as input signal and using the second rectangular signal as clock signal Trigger (Flip-Flop), allows the difference frequency generations of two rectangular signals of trigger.Then assessment circuit is detectable is touching It sends out the difference frequency of the output of device and is exported as output signal.The slow output oscillation of trigger for example can be by micro- Controller detects, clock frequency work that can be small, because counter itself is only with the variation of slow difference frequency.
The embodiment of the present invention is shown in the accompanying drawings and it is described in detail in the following description.In attached drawing Identical appended drawing reference indicates to implement the component or element of identical or similar function.
Detailed description of the invention
Fig. 1 shows according to the present invention for detecting the implementation of the sensor module of the rotation angle at rotating member The schematical diagram of example.
Fig. 2 shows the schematical frame circuit diagram of the sensor module according to the present invention in Fig. 1.
Fig. 3 shows the feature line chart for the angle information that the sensor module according to the present invention in Fig. 1 and 2 generates.
Specific embodiment
It is according to the present invention for detecting in the rotating member 3 Jing Guo multiple rotations as visible from Fig. 1 to Fig. 3 The shown embodiment of the sensor module 1 of the rotation angle [alpha] at place includes: the first measured value transmitter 10, in circumference Scheduled first speed ratio is sentenced to couple with rotating member 3；With the second measured value transmitter 20, with scheduled at circumference Two speed ratios are coupled with rotating member 3.Here, the first measured value transmitter 10 is combined generation first with the first measured value receiver 30 Angle information α 1, and the second measured value transmitter 20 is combined with the second measured value receiver 40 and generates second angle information α 2. Then the two angle informations α 1, α 2 can be assessed for determining the current rotation angle [alpha] of rotating member 3.According to the present invention, First angle information α 1 is converted into first frequency signal f1 by assessment and control unit 50, and second angle information α 2 is converted Output signal fN is generated at second frequency signal f2 and by the two frequency signals f1, f2, which rotates structure The current rotation angle [alpha] of part 3.
In the embodiment illustrated, according to the present invention for detecting the sensing of the rotation angle at rotating member 3 Device assembly 1 uses the steering angle to determine vehicle as steering angle sensor.It is self-evident, the basis of alternative embodiment Sensor module 1 for detecting the rotation angle at rotating member 3 of the invention can also be used in Industry Control.
As being also shown in Fig. 1, rotating member 3 is implemented as that (it has the first tooth with matrix 5 and main ring gear 7 Number) gear.Alternatively, rotating member 3 may be, for example, axis, couple with the gear with main ring gear.Two measured values are sent Device 10,20 is equally implemented as gear, wherein the first measured value transmitter 10 has the matrix 12 with the first ring gear 14, and the Two measured value transmitters 20 have the matrix 22 with the second ring gear 24.The number of teeth of ring gear 7,14,24 is different.Therefore, main ring gear 7 With such as 42 teeth, the first ring gear 14 has such as 26 teeth, and the second ring gear 24 has such as 28 teeth.Such as from Fig. 1 As being also shown in Fig. 2, the rotary motion α of rotating member 3 is transformed on two measured value transmitters 10,20.Measured value Receiver 30,40 converts corresponding angle information α 1, the α 2 within the scope of 0 to 360 ° of two measured value transmitters 10,20 At corresponding frequency signal f1, f2, which for example respectively represents the frequency of oscillation of oscillator and according to corresponding survey The position of magnitude transmitter 10,20.Assessment and control unit 50 generate or calculate output signal fN by frequency signal f1, f2, It is also specific even across the multiple rotations of rotating member 3.The multiple rotations by rotating member 3 are shown in FIG. 3 The variation of angle information α 1, α 2 in the range of 0 to 1440 °.
In the embodiment illustrated, the rotation angle of detection rotating member 3 is carried out by eddy current effect.Such as from Fig. 1 As being also shown, the disk shaped base 12,22 of measured value transmitter 10,20 respectively has spiral shapeLead The metal covering 16,26 of electricity.Measured value receiver 30,40 respectively has face formula search coil 32,42, in the circuit not being shown specifically On plate with scheduled spacing be arranged on corresponding measured value transmitter 10,20 or under.
Here, conductive metal covering 16,26 influences corresponding search coil 32,42 according to coverage by eddy current effect Inductance.Corresponding face formula search coil 32,42 is arranged about corresponding metal covering 16,26 in this way, so that coverage is in correlation Current rotation angle α 1, the α 2 of measured value transmitter 10,20 be that there is in the case where 0 ° maximum value, and in current rotation angle α 1, α 2 are that have minimum value in the case where 180 °.It is in current rotation angle α 1, the α 2 of relevant measured value transmitter 10,20 In the case where 0 °, in the illustrated embodiment, face formula search coil 32,42 is completely covered in conductive metal covering 16,26.It is rotating Angle is covering trend zero in the case where 180 °.By eddy current effect, the inductance of corresponding search coil 32,42 changes, so that electric Inductance value clearly reappears position of the relevant measured value transmitter 10,20 within the scope of 0 to 360 °.In shown embodiment In, face formula search coil 32,42 is respectively constituted with scheduled intermediate frequency f01、f02Oscillating circuit 52,54 frequency determine Part.By the rotation of corresponding measured value transmitter 20,30, in scheduled Measurement bandwidth, face formula search coil 32,42 Inductance variation change the intermediate frequency f0 of corresponding oscillating circuit 52,541、f02.Preferably, oscillating circuit 52,54 is real respectively Apply into LR oscillator.As a result, then angle information α 1, α 2 are first converted into inductance and change and be then converted into frequency change Change.
As being also shown in Fig. 2, in the embodiment illustrated, a part as assessment and control unit 50 The first oscillating circuit 52 implement, with the first face formula search coil 32 has the first intermediate frequency f01, and as assessment The second oscillating circuit 54 implement with a part of control unit 50, with the second face formula search coil 42 has among second Frequency f02, with the first intermediate frequency f01It is so different, so that the frequency range of oscillating circuit 52,54 is in scheduled measurement band It is not overlapped in wide.Assessment and control unit 50 include assessment circuit 56, receive the current intermediate frequency of oscillating circuit 52,54 f01、f02The two frequencies letter is determined as first frequency signal and second frequency signal f1, f2, and by mixing and/counting It the difference on the frequency of number f1, f2 and is exported as output signal fN.
Assessment circuit 56 can mix frequency signal f1, f2 of oscillating circuit 52,54, using not being shown specifically with for example simulating Low-pass filter filtering and to the signal-count after low-pass filtering.Then assessment circuit 56 exports the signal counted as defeated Signal fN out.Alternatively, assessment circuit 56 can be via the analog/digital converter that at least one is not shown specifically by oscillating circuit 52, frequency signal f1, f2 after 54 frequency signal f1, f2 digitlization and hybrid digital, filtered using low-pass filter With to the signal-count after low-pass filtering.Then assessment circuit 56 exports the signal counted as output signal fN.
Possibilities are assessed as others, assessment circuit 56 can be via unshowned threshold switch by oscillating circuit 52,54 Frequency signal f1, f2 be converted into rectangular signal and respectively with unshowned counter to frequency f1, f2 count.Then it assesses 56 digital terrain of circuit at the two counters difference frequency and export the numerical value of the number as output signal fN.Alternatively, Frequency signal f1, f2 of oscillating circuit 52,54 can be converted into rectangular signal via threshold switch by assessment circuit 56, and by example The first rectangular signal of first frequency signal f1 is such as represented as the input signal at trigger, which is preferably implemented as D type flip flop.Such as it represents the second rectangular signal of second frequency signal f2 and can be used as clock signal and be supplied to trigger.Thus it touches Device is sent out with the difference frequency generation of the two rectangular signals, wherein the detection of assessment circuit 56 the output of trigger difference frequency and It is exported as output signal fN.Then it is vibrated by the slow output of microcontroller detection trigger, which is A part of assessment and control unit 50 and clock frequency work that can be small, because counter itself is only with slow difference frequency Variation.This illustrates a kind of particularly advantageous and suitable embodiments of cost.

Claims (9)

1. a kind of for detecting the sensor module of rotation angle (α) of the rotating member (3) Jing Guo multiple rotations in the car (1), which includes the first measured value transmitter (10), at circumference with scheduled first speed ratio with it is described Rotating member (3) couples；With the second measured value transmitter (20), with scheduled second speed ratio and the rotation at circumference Component (3) couples, wherein the first measured value transmitter (10) and the first measured value receiver (30) combine and generate first jiao It spends information (α 1), and the second measured value transmitter (20) and the second measured value receiver (40) combine and generate second angle Information (α 2), the two angle informations can be evaluated for determining the current rotation angle of the rotating member (3) (α), which is characterized in that the first angle information (α 1) is converted into first frequency signal (f1) by assessment and control unit (50) And the second angle information (α 2) is converted into second frequency signal (f2) and is produced by two frequency signals (f1, f2) It gives birth to output signal (fN), the current rotation angle (α) of rotating member (3) described in the output signal representative, wherein the measurement Value receiver (30,40) generates the angle information (α 1, α 2) changed respectively as inductance, and the angle information is by the assessment and control Unit (50) processed is converted into frequency signal (f1, f2).
2. sensor module according to claim 1, which is characterized in that the measured value transmitter (10,20) has respectively There is a plate-shaped base body (12,22) at least one conductive metal covering (16,26), and the measured value receiver (30, 40) it is respectively provided at least one face formula search coil (32,42), wherein at least one described conductive metal covering (16,26) is pressed The inductance of at least one corresponding face formula search coil (32,42) is influenced according to coverage.
3. sensor module according to claim 2, which is characterized in that at least one face formula search coil (32, 42) part that there is the frequency of the oscillating circuit (52,54) of scheduled intermediate frequency to determine is constituted, wherein passing through corresponding measurement It is worth the rotation of transmitter (20), in scheduled Measurement bandwidth, the inductance variation change pair of the face formula search coil (32,42) The intermediate frequency for the oscillating circuit (52,54) answered.
4. sensor module according to claim 3, which is characterized in that have the first of the first face formula search coil (32) Oscillating circuit (52) has the first intermediate frequency, and the second oscillating circuit (54) with the second face formula search coil (42) has There is the second intermediate frequency, the difference of second intermediate frequency and first intermediate frequency is, the oscillating circuit (52,54) Frequency range be not overlapped in scheduled Measurement bandwidth.
5. sensor module according to claim 4, which is characterized in that assessment circuit (56) receives the oscillating circuit The current intermediate frequency of (52,54) as first frequency signal and second frequency signal (f1, f2) and by mixing and/or It counts the difference on the frequency for determining two frequency signals (f1, f2) and is exported the difference on the frequency as output signal (fN).
6. sensor module according to claim 5, which is characterized in that described in assessment circuit (56) simulation ground mixing The frequency signal (f1, f2) of oscillating circuit (52,54) is filtered using low-pass filter and to the signal meter after low-pass filtering Number, wherein the assessment circuit (56) is exported the signal of counting as output signal (fN).
7. sensor module according to claim 5, which is characterized in that the assessment circuit (56) is by the oscillating circuit The frequency signal (f1, f2) of (52,54) digitizes and the frequency signal (f1, f2) after hybrid digital, utilizes low-pass filtering Device filters and to the signal-count after low-pass filtering, wherein the assessment circuit (56) is using the signal of counting as output signal (fN) it exports.
8. sensor module according to claim 5, which is characterized in that the assessment circuit (56) will by threshold switch The frequency signal (f1, f2) of the oscillating circuit (52,54) is converted into rectangular signal and is utilized respectively counter to frequency (f1, f2) is counted, wherein the assessment circuit (56) digital terrain is at the difference frequency of two counters and using difference frequency as output Signal (fN) output.
9. sensor module according to claim 5, which is characterized in that the assessment circuit (56) will by threshold switch The frequency signal (f1, f2) of the oscillating circuit (52,54) is converted into rectangular signal, using the first rectangular signal as input signal And it is supplied to trigger using the second rectangular signal as clock signal, so that the trigger is with the difference frequency of two rectangular signals Oscillation, wherein the assessment circuit (56) detects the difference frequency in the output of the trigger and believes difference frequency as output Number (fN) output.
CN201510887377.8A 2014-10-09 2015-10-08 For detecting the sensor module of the rotation angle at rotating member Active CN105547142B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220465.8 2014-10-09
DE102014220465.8A DE102014220465A1 (en) 2014-10-09 2014-10-09 Sensor arrangement for detecting rotational angles on a rotating component

Publications (2)

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