• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Sensor device (1) having a first generator (10) and a second generator (20) coupled to the rotary component (3) in two transmission ratios each generating an angular information (a1, a2) in connection with two sensors (30, 40). A unit (50) converts the angular information (a1, a2) into two frequency signals (f1, f2) giving an output signal (fN) representing the current rotation angle (a) of the rotating component (3).
    公开号:FR3027104A1
    申请号:FR1559575
    申请日:2015-10-08
    公开日:2016-04-15
    发明作者:Stefan Leidich；Fabian Henrici
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to a sensor device for capturing rotational angles of a rotary component, in particular in a motor vehicle over several rotations, having a first generator of measured values whose periphery is coupled at a first predefined transmission ratio to the rotating component and a second measurement value generator coupled peripherally to the rotary component at a second transmission ratio, the first measurement value generator generating a first angular information in conjunction with a first measurement value sensor and the second measurement value generator generating a second angular information in connection with a second measurement value sensor, which information is used to determine the current rotation angle of the rotary component.
    [0002] State of the art Known steering angle sensors use a counting wheel to determine the number of rotations made by the steering wheel, without contact, using magnetic field sensors. Such a system has the disadvantage of requiring a quiescent current when the ignition is off to detect the rotation of the steering wheel when the ignition is off. In case of non permanent use of the vehicle, it unnecessarily empties the battery. But if the quiescent current is cut, we can no longer uniquely determine the steering angle when turning the steering wheel, since the ignition is off and the battery, disconnected. A more advanced system uses steering wheel angle measurements with two angle sensors to process this information according to the Vernier principle, modified, and eliminates the inconvenience of the quiescent current.
    [0003] Thus, DE 195 06 938 A1 describes by way of example a method and an angle measuring device of a rotating body. The rotating body cooperates unilaterally with at least two other rotating bodies. The other rotating bodies are for example pinions whose angular position is determined using two sensors. From the angular positions thus obtained for the two rotating bodies, additional one can then determine the angular position of the rotating bodies. In order to obtain unequivocal information, it is necessary that the three rotating bodies or the sprockets respectively have a determined number of teeth or a given transmission ratio. This method and this device serve for example to determine the steering angle of the vehicle. The measurement principle described can be applied to any type of angular sensor such as, for example, optical, magnetic, capacitive, inductive or resistant sensors. The other rotary bodies function as generators of measured values and the corresponding sensors as sensors for measuring values. DESCRIPTION AND ADVANTAGES OF THE INVENTION The subject of the invention is a sensor device of the type defined above characterized by an operating and control unit which transforms the first angular information into a first frequency signal and the second angular information into a second frequency signal and generates an output signal from the two frequency signals, this output signal representing the current rotation angle of the rotating component.
    [0004] The sensor device according to the invention for capturing the rotational angles of a rotary component, in particular in a vehicle, has the advantage that by transforming the angular information of the two measurement value generators whose corresponding frequency it allows a simple and fast operation of the signals 25 to determine the current rotation angle. In addition, for the operation of the frequency signals, the components already installed in the vehicle can be used. Preferably, during operation, the difference of the two frequencies of the signals is formed and used as a Vernier signal. This Vernier signal then unequivocally describes the position of the rotating component over several turns. Forming the difference consists, for example, in mixing and / or counting the frequency signals. As an embodiment of the sensor device according to the invention for capturing rotational angles of a rotary component, it is possible to use, for example, the steering angle sensor for determining the steering angle of the vehicle and / or or use industrial controls. Embodiments of the invention are constituted by a sensor device for capturing the rotational angles of a rotary component, in particular a vehicle. A first measurement value generator cooperates with its periphery and in a first predetermined gear ratio with a rotating component; a second measurement value generator cooperates peripherally and in a second gear ratio with this rotary component to which it is also coupled. The first measurement value generator generates, in connection with a first measurement value sensor, a first angular information and the second measurement value generator generates, in connection with a second measurement value sensor, a second angular information used. to determine the current rotation angle of the rotary component. According to the invention, an operating and control unit converts the first angular information into a first frequency signal and the second angular information into a second frequency signal and generates from the two frequency signals an output signal. which represents the current rotational angle of the rotating component. The frequency signal hereinafter designates various signals. Thus, for example, the rather sinusoidal output signal of the oscillator oscillating at a given frequency or the rectangular signal which is derived from it and has the same frequency or the numerical value or the frequency. The count state represented by the oscillation frequency can all be called the "frequency signal". The operation and control unit is an electrical circuit or electrical apparatus such as a control apparatus which processes or operates the sensor signals inputted. The operation and control unit comprises at least one interface in the form of a circuit and / or a program. In the case of an embodiment of the interface in the form of a circuit, the interfaces comprise for example an ASIC circuit which provides various functions of the operating and control unit. It is also possible to make the interfaces under the form of clean integrated circuits or to make them at least partly in the form of discrete components. In the case of an embodiment in the form of a program, the interfaces are program modules for example in a microprocessor alongside other program modules. It is also advantageous to use a computer program product with program code recorded on a machine readable medium such as a semiconductor memory, a hard disk or an optical memory and to exploit it when program is applied by the operation and control unit.
    [0005] According to other features, the sensor device makes it possible to grasp the angle of rotation of a rotary component, especially in a vehicle. It is particularly advantageous that the measurement value sensors generate respective angular information as inductance variations that the operating and control unit converts into frequency signals. According to an advantageous development of the sensor device according to the invention, the measurement value generators each have a disk-shaped base body having at least one electrically conductive metal surface and the measuring value sensors. have, respectively, at least one surface-detection coil. The metal surface which is at least electrically conductive can influence the inductance of at least one corresponding detection coil depending on the degree of overlap. In addition, the surface detection coil performs the portion that determines the frequency of the oscillator with a predefined average frequency. The variations in inductance of the surface detection coils make it possible to modify the average frequency of the corresponding oscillator by rotating the corresponding generator of measurement values in a predefined measurement bandwidth. Preferably, the oscillators are LR oscillators. Thus, the angular information is first transformed into a variation of inductance and then into a frequency variation. The average frequency of each oscillator varies for a rotation of the measurement value generator, between 0 and 360 °, by plus / minus the half bandwidth, the measurement bandwidth being typically significantly less than the average frequency. According to an advantageous development of the sensor device of the invention, a first oscillator is provided with a first surface detection coil having a first average frequency and a second oscillator having a second surface detection coil having a second average frequency; the second frequency differs from the first average frequency and the frequency ranges of the oscillator do not overlap in the predefined bandwidth. This advantageously results in dimensional variations or zero crossings of the output signal and / or the difference signal. According to another development of the sensor device according to the invention, an operating circuit receives the current average frequencies of the oscillators as first and second frequency signals and determines the frequency difference of the two frequency signals by mixing and / or counting to provide an output signal. The operating circuit can mix the frequency signals of the oscillators analogically, filter them with a low-pass filter, and derive the signal obtained by the low-pass filtering. The operating circuit can then transmit as output signal the counted signal. Alternatively, the operating circuit digitizes oscillator frequency signals by an analog-to-digital converter and mixes the digitized frequency signals, filters them with a low-pass filter, and counts the filtered signal. In this case also, the operating circuit can transmit as output signal, the counting signal. As another alternative, the operating circuit converts the frequency signals of the oscillators by threshold switches to form rectangular signals and count the frequency with a counter. The operating circuit can then form the digital frequency difference using the two counters and output the result as an output signal. In the case of a particularly economical embodiment, the operating circuit converts the frequency signals of the oscillators by threshold switches into recurrent signals, by applying a first rectangular signal as the signal of the oscillator. input and a second rectangular signal as a clock signal to a Flip-Flop flip-flop so that Flip-Flop flip-flop can oscillate with the difference in the frequencies of the two rectangular signals. The operating circuit can then seize the frequency difference at the flip-flop flip-flop output and output that signal as the output signal. The slow output oscillation of the Flip-Flop flip-flop may for example be entered by a microcontroller which operates with a low clock frequency because the counter only changes with the difference in slow frequency. Drawings The present invention will be described hereinafter in more detail with the aid of an exemplary embodiment of a sensor device shown in the drawings in which the same components or means providing the same function bear the same references. . Thus: FIG. 1 is a diagram of an exemplary embodiment of a sensor device according to the invention for capturing the rotation angle of a rotary component, FIG. 2 shows a block diagram of the sensor device. According to the invention shown in FIG. 1, FIG. 3 shows a characteristic diagram of the angular information generated by the sensor device according to FIGS. 1 and 3. DESCRIPTION OF EMBODIMENTS OF THE INVENTION According to FIGS. the exemplary embodiment of a sensor device 1 according to the invention for capturing the angle of rotation (a) of a rotary component 3 on several revolutions comprises a first measuring value generator 10 coupled in periphery, according to a first gear ratio predefined to a rotary component 3 and a second measurement value generator 20 peripherally coupled according to a second gear ratio to the rotary component 3. The first generatrix Measured values 10 combined with a first measurement value sensor 30 generates first angular information (a1) and the second measured value generator 20 in combination with a second measurement value sensor. 40 generates a second angular information (a2). The two angular informations (a 1, a 2) are used to determine the current rotation angle (a) of the rotary component 3. According to the invention, an operation and control unit 50 transforms the first angular information (a1 ) in a first frequency signal f1 and the second angular information (a2) in a second frequency signal f2; with the two frequency signals f1, f2, this unit generates an output signal fN which represents the current rotation angle (a) of the rotary component 3. The exemplary embodiment has the sensor device 1 according to the invention for detecting the angle of rotation of a rotating component 3 such as an angle sensor for determining the steering angle of a vehicle. Alternative embodiments of the sensor device 1 according to the invention can also be used to capture the rotation angle of a rotating component 3 in the industrial controls. As further shown in Figure 1, the rotating component 3 is a pinion with a base body 5 and a main ring gear 7 having a first number of teeth. Alternatively, the rotary component 3 is a shaft coupled with a pinion to the main ring gear. The two measurement value generators 10, 20 are also in the form of toothed wheels; the first measurement value generator 10 has a base body 12 with a first ring gear 14; the second measurement value generator 20 has a base body 22 with a second ring gear 24. The number of teeth of the ring gear 7, 14, 24 is different. Thus, the main ring gear 7 has for example 42 teeth; the first ring gear 14 has for example 26 teeth and the second ring gear 24 has for example 28 teeth.
    [0006] According to FIGS. 1 and 2, the rotational movement α of the rotary component 3 is transmitted to the two measurement value generators 10, 20. The measurement value sensors 30, 40 transform the respective angular information (a 1, a 2). in an angular range of 0 to 360 ° of the two measurement value generators 10, 20 in 35 a corresponding frequency signal f1, f2 which represents for example 3027104 8 each time the oscillation frequency of an oscillator and depends on the position of the corresponding measurement value generator 10, 20. The operating and control unit 50 generates or calculates from the signals of frequency f1, f2, the output signal fN which is uniquely associated with the revolution component (a 1, a2) over several revolutions of the rotary component 3 in a range between 0 ° and 1440 ° is represented in FIG. presented realization, the angle of rotation of the rotary component 3 is entered using the effect of the eddy currents. As further shown in FIG. 1, the disk-shaped base bodies 12, 22 of the measurement value generators 10, 20 each have an electrically conductive metal surface 16, 26 in the form of a spiral. The measurement value sensors 30, 40 each have surface detection coils 32, 42 which are on a non-detailed circuit board at a given distance above or below the measured value generators 10, 20 correspondents. The electrically conductive metal surfaces 16, 26 influence, by the effect of the eddy currents, the inductance of the corresponding detection coils 32, 42 as a function of the degree of overlap. The respective surface detection coil 32, 42 is installed with respect to the corresponding metal surface 16, 26 so that the degree of overlap for the current angle of rotation (a 1, a 2) of the corresponding measurement value generator 10, 20, has a maximum value for 0 ° and that for a current angle of rotation (a 1, a2) equal to 180 ° the value is minimal. For a current rotation angle (a 1, a 2) of 0 ° for the measurement value generators 10, 20 in the embodiment shown, the electroconductive metal surfaces 16, 26 completely cover the detection coils 32, 42 For an angle of rotation of 180 °, the overlap is zero. The effect of the eddy currents modifies the corresponding inductance of the detection coil 32, 42 so that the value of the inductance unequivocally represents the position of the corresponding generator 10, 20 of the measurement value in the range between 0 ° and 360 °. In the exemplary embodiment shown, the surface detection coils 30, 32, 42 each have a frequency determining portion of the oscillator 52, 54 with a predefined mean frequency f01, f02. The inductance variations of the surface detection coils 32, 42 change the average frequency f01, f02 of the corresponding oscillator 52, 54 over a revolution of the measurement value generator 20, 30 within the predefined width. of the measuring tape. Preferably, the oscillators 52, 54 are sub-oscillators LR. The angular information at 1, a2 is thus combined with a variation of inductance giving a frequency variation. As furthermore appears in FIG. 2, in the embodiment shown, a first oscillator 52 made as operating and control unit 50 gives, by the first surface detection coil 32, an average frequency f01. The second oscillator 54 which forms part of the control and operating circuit 50 gives by a second surface detection coil 42 a second average frequency f02 which differs from the first average frequency f01 so that the frequency ranges oscillators 52, 54 do not overlap with the predefined measurement bandwidths. The control and operating unit 50 comprises an operating circuit 56 which receives as first and second frequency signals f1, f2, the current average frequencies f01, f02 of the oscillators 52, 54 and by mixing and / or counting on determines the frequency difference of the two frequency signals f1, f2 and outputs it as an output signal. The operating circuit 56 can mix the frequency signals f1, f2 provided by the oscillators 52, 54 in an analog manner, filter these signals with a non-detailed low-pass filter, and then count the separated signals by filtering. . The operating circuit 56 then provides the counted signal as the output signal fN. In a variant, the operating circuit 56 can also digitize the frequencies f1, f2 of the oscillator 52, 54 by means of a non-detailed analog / digital converter and mix the digitized frequency signals f1, f2 to filter them. with a low-pass filter and then emit the signal filtered by the low-pass filter. The operating circuit 56 then transmits the counted signal as output signal fN. As a further possibility of operation, the circuit 56 can transform the frequency signals f1, f2 of the oscillators 52, 54 using non-detailed threshold switches into transformed rectangular signals and count the frequencies f1, f2 using counter not shown. The operating circuit 56 provides the frequency difference of the two counters and outputs the digital value as the output signal fN. As a variant, the operating circuit 56 converts the frequency signals f1, f2 of the oscillators 52, 54 by threshold switches into rectangular signals and applies them as the first rectangular signal which represents, for example, the first output signal. as a flip-flop flip-flop input signal preferably made as Flip-Flop D. A second rectangular signal which represents for example the second frequency signal f2 can be applied as a clock signal to the Flip flip-flop. -Flop to thus oscillate the flip-flop to the difference of the frequencies of the two rectangular signals; the operating circuit 56 captures the frequency difference at the output of the Flip-Flop and provides it as output signal fN.
    [0007] The slowest output oscillation of the flip-flop is captured by a microcontroller which is part of the operating and control circuit 50 and operates at a low frequency since the counters only change for frequency differences. slow. This is a particularly advantageous and economical embodiment.
    [0008] 3027104 11 NOMENCLATURE OF MAIN ELEMENTS 1 Sensor device 3 Rotary component 5 5 Basic body 7 Main toothed ring 10 First measuring value generator 12 Basic body 14 First ring gear 10 16, 26 Electrically conductive surface 20 Second generator Measuring values 22 Base housing 24 Second ring gear 30 Measuring value generator 15 32 Surface detection coil Measuring value sensor 42 Surface detection coil 52, 54 Oscillator 56 Operating circuit 20 G Rotation angle component 3 to 1 First angular information a2 Second angular information fl First frequency signal f2 Second frequency signal 25 fN Output signal f01, f02 Average frequency 30
    权利要求:
    Claims (3)
    [0001]
    CLAIMS1 °) Sensor device (1) for gripping angles of rotation (a) of a rotary component (3), in particular in a motor vehicle over several rotations, having a first measurement value generator (10) whose periphery is coupled in a predefined first transmission ratio to the rotary component (3), and a second measurement value generator (20) peripherally coupled to the rotary component (3) at a second transmission ratio, the first generator of values. sensor (10) generating a first angular information (a1) in connection with a first measurement value sensor (30), and the second measurement value generator (20) generating a second angular information (a2) in connection with with a second measurement value sensor (40), this information being used to determine the current rotation angle (a) of the rotary component (3), a sensor device (1) characterized by an operating unit and controller (50) which converts the first angular information (a1) into a first frequency signal (fl) and the second angular information (a2) into a second frequency signal (f2) and generates an output signal ( fN) from the two frequency signals (f1, f2), this output signal representing the current rotation angle (a) of the rotary component (3).
    [0002]
    Sensor device according to Claim 1, characterized in that the measuring value sensors (30, 40) generate the angular information (a 1, a 2) each time as variations of inductance that the unit of measurement. operation and control (50) transforms into frequency signals (fl, f2).
    [0003]
    Sensor device according to Claim 1, characterized in that the measuring value generators (10, 20) have respectively a disk-shaped base body (12, 22) having at least one metal surface ( 16, 26) and the measuring value sensors (30, 40) each have at least one surface-detection coil (32, 42), at least one electroconductive metal surface (16, 26) influence the inductance of the corresponding sensing coil (32, 42) as a function of the degree of overlap. Sensor device according to Claim 3, characterized in that at least one surface detection coil (32, 42) constitutes the frequency-determining part of the oscillator (52, 54) with a medium frequency (f0i). , f02), the inductance variations of the surface detection coils (32, 42) modifying the average frequency (f0i, f02) of the corresponding oscillator (52, 54) on a rotation of the measurement value generator (20, 30) within a predefined measurement bandwidth. Sensor device according to claim 4, characterized in that a first oscillator (52) has a first average frequency (f01) with a first surface detection coil (32) and a second oscillator (54). a second average frequency (f02) with a second surface detection coil (42), this second average frequency being different from the first average frequency (f01) so that the frequency ranges of the oscillators (52, 54) do not overlap in predefined measurement bandwidths. Sensor device according to claim 5, characterized in that an operating circuit (56) receives the current average frequencies (f01, f02) of the oscillators (52, 54) as a first and a second signal of frequency (f1, f2) and determines by mixing and / or counting a frequency difference of the two frequency signals (f1, f2) to provide the difference as an output signal (fN). Sensor device according to Claim 6, characterized in that the operating circuit (56) mixes the frequency signals (F1, F2) of the oscillators (52, 54), the filters with a filter low-pass signal and the operating circuit (56) transmitting this signal as an output signal (fN). Sensor device according to claim 6, characterized in that the operating circuit (56) digitizes the frequency signals (f1, f2) of the oscillators (52, 54) and mixes the digitized frequency signals ( fl, f2), the filters with a low-pass filter and counts the signal filtered by the low-pass filter, the operating circuit (56) transmitting the signal counted as the output signal (fN). Sensor device according to Claim 6, characterized in that the evaluation circuit (56) transforms the frequency signals (F1, F2) of the oscillators (52, 54) into rectangular signals by threshold switches and a respective counter counts the frequency (f1, f2), the operating circuit (56) forming the frequency difference of the two counters and supplying it as the output signal (fN). Sensor device according to Claim 6, characterized in that the operating circuit (56) converts the frequency signals (F1, F2) of the oscillators (52, 54) by threshold switches in the form of signals. rectangular, applies a first rectangular signal as an input signal and a second rectangular signal as a clock signal to a Flip-Flop flip-flop such that Flip-Flop flip-flop 35 oscillates at the frequency difference of the two rectangular signals, 3027104 the operating circuit (56) seizing the frequency difference at the output of the Flip-Flop to transmit it as an output signal (fN). 5
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    同族专利:
    公开号 | 公开日
    CN105547142B|2019-06-04|
    FR3027104B1|2019-01-25|
    CN105547142A|2016-05-04|
    DE102014220465A1|2016-04-14|
    引用文献:
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    DE102018132097B4|2018-12-13|2020-11-26|Thyssenkrupp Ag|Sensor unit with at least one gear wheel formed from a printed circuit board|
    CN110260835B|2019-06-21|2021-03-16|天津理工大学|Method and device for measuring variable included angle by using natural frequency|
    DE102019006137A1|2019-08-30|2021-03-04|Tdk-Micronas Gmbh|Rotation angle measurement method and rotation angle measurement circuit|
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    法律状态:
    2016-10-25| PLFP| Fee payment|Year of fee payment: 2 |
    2017-10-23| PLFP| Fee payment|Year of fee payment: 3 |
    2018-03-23| PLSC| Publication of the preliminary search report|Effective date: 20180323 |
    2018-10-22| PLFP| Fee payment|Year of fee payment: 4 |
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    2020-10-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-18| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014220465.8|2014-10-09|
    DE102014220465.8A|DE102014220465A1|2014-10-09|2014-10-09|Sensor arrangement for detecting rotational angles on a rotating component|
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