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WO2013156916A1 - Dispositif de détection de position angulaire et son procédé de fabrication - Google Patents

Dispositif de détection de position angulaire et son procédé de fabrication Download PDF

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Publication number
WO2013156916A1
WO2013156916A1 PCT/IB2013/052977 IB2013052977W WO2013156916A1 WO 2013156916 A1 WO2013156916 A1 WO 2013156916A1 IB 2013052977 W IB2013052977 W IB 2013052977W WO 2013156916 A1 WO2013156916 A1 WO 2013156916A1
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WO
WIPO (PCT)
Prior art keywords
signal
sensor
rotatable shaft
voltage
state
Prior art date
Application number
PCT/IB2013/052977
Other languages
English (en)
Inventor
Salvador Hernandez-Oliver
Thorsten Munzig
Original Assignee
Tyco Electronics Corporation
Tyco Electronics Amp Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tyco Electronics Corporation, Tyco Electronics Amp Gmbh filed Critical Tyco Electronics Corporation
Priority to DE201321000100 priority Critical patent/DE212013000100U1/de
Priority to EP13726872.8A priority patent/EP2839246A1/fr
Publication of WO2013156916A1 publication Critical patent/WO2013156916A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields

Definitions

  • the present disclosure relates generally to a position sensing device, and in particular, to a position sensing device that detects an angular position range of a rotatable shaft and the method for making the same.
  • mechanical-contacted position sensing devices are used to detect angular positions of a rotatable shaft.
  • mechanical-contacted position sensing devices have some shortcomings including mechanical wear, low angle accuracy and reliability and no diagnostic capability.
  • the present disclosure provides a sensor for sensing an angular position range of a rotatable shaft, which comprises:
  • an indicating circuit for generating a binary state signal having a first signal state and a second signal state in response to the rotation of a bipolar magnet device that is attached on the rotatable shaft and adapted to rotate together with the rotatable shaft;
  • an adjusting circuit for adjusting the binary state signal to compensate variations of operating conditions of the sensor
  • the binary state signal is in the first signal state when the rotatable shaft is within the angular position range and the binary state signal is in the second signal state when the rotatable shaft is beyond the angular position range.
  • the present disclosure provides a method for sensing an angular position range of a rotatable shaft on which a magnet device is mounted, which comprises the steps of:
  • the binary state signal is in the first signal state when the rotatable shaft is within the angular position range and the binary state signal is in the second signal state when the rotatable shaft is beyond the angular position range.
  • the method further comprises the steps of:
  • the present disclosure provides a method for sensing an angular position range of a rotatable shaft on which a magnet device is mounted, which comprises the steps of: generating a function line when the bipolar magnet device is rotating around the rotatable shaft in a simulation or calibration process;
  • the present disclosure provides a sensor for sensing an angular position range of a rotatable shaft, which comprises:
  • an indicating circuit for generating a binary state signal having a first signal state and a second signal state in response to the rotation of a bipolar magnet device that is attached on the rotatable shaft and adapted to rotate together with the rotatable shaft;
  • a memory means for providing at least two reference voltage points having a first reference voltage point and a second reference voltage point that represent two voltage points on a linear function line;
  • a sensing device for generating a sensed electrical signal in response to the magnetic flux density changes along two dimensions when the bipolar magnet rotates around the rotatable shaft;
  • a comparing means for comparing the voltage of the sensed electrical signal with the two reference voltage points
  • the present disclosure provides a sensor for sensing an angular position range of a rotatable shaft, which comprises:
  • an indicating circuit for generating a binary state signal having a first signal state and a second signal state in response to the rotation of a bipolar magnet device that is attached on the rotatable shaft and adapted to rotate together with the rotatable shaft;
  • a threshold circuit for providing a threshold voltage on a curve-shaped function line
  • a sensing device for generating a sensed electrical signal in response to the magnetic flux density changes along one dimension when the bipolar magnet (304 A, 304B) rotates around the rotatable shaft;
  • the indicating circuit generates the first signal state when the voltage of the sensed electrical signal is above (or below) the threshold voltage and generates the second signal state when the voltage of the sensed electrical signal is below (or above) the threshold voltage.
  • Figure 1 depicts a position sensing system 100 according to the present disclosure, which shows a side view of the rotatable shaft 108 in the position sensing system 100;
  • Figure 2 depicts the position sensing system 100 of Figure 1, which shows the top view of the rotatable shaft 108 shown in Figure 1 ;
  • Figure 3 depicts the position sensing system 100, which shows the sectional view of the rotatable shaft 108 shown in Figure 2 along the line A-A in Figure 2;
  • Figures 4A-B depict the magnet device 102 and the sensing device 104 in Figures 1-3 in greater detail;
  • Figure 5 A depicts one embodiment of the processing circuit 106 in the position sensing system 100 in greater detail
  • Figure 5B depicts another embodiment of the processing circuit 106 in the position sensing system 100 in greater detail
  • FIG. 6 depicts the processing unit 504 shown in Figure 5 in greater detail
  • Figures 7A-C illustrate the calibration (or simulation) process using two function lines that are generated in response to the magnetic flux density changes and/or magnetic field changes along two dimensions;
  • Figures 8A-B illustrate the calibration (or simulation) process using one function line that is generated in response to the magnetic flux density changes and/or magnetic field changes along one dimension;
  • Figures 9A-B illustrates using either a positive binary state signal 107 or a negative binary state signal 107' to indicate the rotation range for the rotatable shaft 108 shown in Figures 1-3;
  • Figure 10 depicts an engine control system 900, in which the output 111 of the processing circuit 106 shown in Figures 1-3 is used to control the engine in an automobile vehicle.
  • FIG. 1 depicts a position sensing system 100 according to the present disclosure, which shows the side view of the rotatable shaft 108 in the position sensing system 100.
  • the position sensing system 100 includes a magnet device 102, a sensing device 104 and a processing circuit 106.
  • the sensing device 104 is electrically connected to the processing circuit 106 through a link 109, and the magnet device 102 is mounted on the rotatable shaft 108 and adapted to rotate together with the rotatable shaft 108 around the axis 112 (as shown in Figure 3) of the rotatable shaft 108.
  • the sensing device 104 is positioned above and separated from the magnet device 102 with a distance D (or air gap) 183.
  • the magnet device 102 When rotating around the axis 112 of the rotatable shaft 108, the magnet device 102 can cause magnetic flux density changes, which in turn causes magnetic field changes, to a position (or a detecting position) where the sensing device 104 is located.
  • the sensing device 104 can generate electrical signals (such as PWM, SENT, etc) when subjected to the magnetic flux density changes from the magnet device 102.
  • the sensing device 104 may include a Hall-effect circuitry for generating electrical signals in response to the magnetic field changes caused by the magnetic flux density changes.
  • the sensing device 104 applies the sensed electrical signals to the processing circuit 106, which in turn generates a binary state signal 110 at its output terminal (i.e. link 111) in response to the sensed electrical signals.
  • the rotatable shaft 108 can move linearly along its longitude direction and rotate around its axis 112 (as shown in Figure 3).
  • the processing circuit 106 maintains its binary voltage state at its output 111.
  • the binary state output 111 of the processing circuit 106 does not change its binary state output in response to the linear motion of the rotatable shaft 108 because the sensing device 104 cannot detect any magnetic flux density changes and/or magnetic field changes from the liner movement of the rotatable shaft.
  • the processing circuit 106 may change its binary voltage state between Vhigh and Vlow at its output 111, depending on the rotation angle of the rotatable shaft 108. In other words, the processing circuit 106 switches its binary state output 111 between Vhigh and Vlow in response to the rotation angle of the rotatable shaft 108.
  • Figure 2 depicts the position sensing system 100 of Figure 1, which shows the top view of the rotatable shaft 108.
  • the sensing device 104 should be drawn in a position above the magnet device 102 (with the distance 183D).
  • the sensing device 104 is illustratively positioned at the lateral side of the rotatable shaft 108 in Figure 2, but using a dot line 129 to reflect the above-below positional relationship between the magnet device 102 and the sensing device 104.
  • the magnet device 102 has a length L along the longitude direction of the rotatable shaft 108 to ensure that the sensing device 104 is always within the effective detecting region of the magnet device 102 when the rotatable shaft 108 linearly moves along its longitude direction.
  • the dotted line 114 indicates a center line along the longitude direction of the rotatable shaft 108 and the dotted lines 115 and 117 define a rotation range (-L1, +L1) of interest. In other words, when the rotatable shaft 108 rotates left and right around the axis 112, the center line 114 rotate towards the dotted lines 115 and 117, respectively.
  • Figure 3 depicts the position sensing system 100 of Figure 2, which shows the sectional view of the rotatable shaft 108 along the line A-A in Figure 2.
  • the rotatable shaft 108 can rotate from its center position (as indicated by the center line 113 in the diameter direction of the rotatable shaft 108 on the rotatable shaft 108) towards its left until it reaches its left rotation limitation -Lm (as indicated dotted line 121) or towards right until it reaches its right rotation limitation +Lm (as indicated by dotted line 123).
  • the center line 113 passes and dissects the axis 112 of the rotatable shaft 108.
  • the two dotted lines 121 and 123 define a whole rotation movement range (-Lm, +Lm) for the rotatable shaft 108.
  • the two dotted lines 115 and 117 define an internal rotation movement range, or a rotation range, (-L1, +L1) for the rotatable shaft 108.
  • the whole rotation movement range and the internal rotation movement range are symmetrical in reference to the axis 112 of and the center line 113 on the rotatable shaft 108. That is, the rotation ranges between -Lm and -LI are equal to those between +Lm and +L1, respectively, in reference to the axis 112 and the center line 113.
  • non- symmetrical arrangements of the rotation movement ranges are possible to a person skilled in the art.
  • the center line 113 at the diameter direction of the rotatable shaft 108 is a straight line that passes through the axis 112 and is normal to the center line 114 along the longitude direction of the rotatable shaft 108(see Fig.2).
  • the sensing device 104 and the processing circuit 106 can detect the angular position of the rotatable shaft 108 and generating a binary state indication signal 107 on the output 111.
  • the processing circuit 106 can generate a first signal state (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B) when the rotatable shaft 108 is within the rotation range (-L1, +L1); the processing circuit 106 generates a second signal state (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B) when the rotatable shaft 108 is outside (or beyond) the rotation range (-L1, +L1).
  • the binary state indication signal 107 is then applied to an ECU (Engine Control Unit) through the output terminal 111 of the processing circuit 106 (as shown Figure 10).
  • Figure 4A depicts one embodiment of the magnet device 102 and the sensing device
  • the magnet device 102 includes a magnet 304A having a south pole and a north pole.
  • the south pole of the magnet 304A is attached on the surface of the rotation shaft 108.
  • the front surface 305 of the sensing device 104 and the surface of the north pole of the magnet 304 A are positioned facing with each other.
  • the south pole and north pole of the magnet 304A are aligned with the center line 113 on the rotatable shaft 108.
  • the sensing device 104 is separated from the magnet 304 A by a distance (or air gap) D 183 and coplanar with the magnet 304 A.
  • the magnet 304A has a length L and a center line 114 along the longitude direction of the rotatable shaft 108.
  • the sensitive point of the sensing device 104 is aligned with the center line 114 of the magnet 304A.
  • the sensing device 104 includes a sensing element 302, which can be a Hall-effect sensing device or magneto -resistive (MR) sensing device that is capable of generating an electrical signal when exposed to a rotating magnetic field. More specifically, a Hall-effect sensing element 302 can be a current-carrying semi-conductor membrane to generate a low voltage perpendicular to the direction of the current flow when subjected to magnetic flux density changes/magnetic field changes normal to the surface of the membrane. As shown in Figure 4 A, the magnetic flux density changes/magnetic field changes within the air gap 183D along three dimensions 303 (Bx, By, Bz).
  • MR magneto -resistive
  • the sensing device 104 is typically designed to detect the magnetic field changes along one of the Bx, or By, or both.
  • the sensing element 302 can be configured on a detecting position that is sensitive and responsive to the magnetic flux density changes/magnetic field changes caused by the rotating magnet 304A.
  • B stands for magnetic flux density
  • Bx indicates the magnetic flux density measurement along the radial direction of the shaft 108 and perpendicular to the sensing element 302
  • By indicates the magnetic flux density measurement that is tangential to the shaft 108 and coplanar to the sensing element 302.
  • Figure 4B depicts another embodiment of the magnet device 102 in great detail.
  • the magnet device 102 and the sensing device 104 are the same with those shown in Figure 4A, except that the orientation of the magnet 304B is different from that of the magnet 304 A in Figure 4 A.
  • the magnet device 102 includes a magnet 304B having a north pole and a south pole.
  • the north pole of the magnet 304B is attached on the surface of the rotation shaft 108.
  • the surface 305 of the sensing device 104 and the surface of the south pole of the magnet 304B are positioned facing with each other.
  • the north pole and south pole of the magnet 304B are aligned with the center line 113 on the rotatable shaft 108.
  • the magnetic field changes within the air gape along three dimensions 303 (Bx, By, Bz).
  • the sensing device 104 is designed to detect the magnetic field changes along one of the Bx or By, or both.
  • Figure 5 A depicts one embodiment of the processing circuit 106 in the position sensing system 100 in greater detail.
  • the processing circuit 106 includes an A/D convertor 502, a digital processing unit 504 and an indicating circuit 508, all of which are electronically connected together through links 503, 505 and 507.
  • the A/D convertor 502 Being electrically connected to the sensing device 104 through the link 109, the A/D convertor 502 receives analog electronic signals as inputs from the sensing device 104, processes the analog electronic signals into digital electronic signals, and applies the digitized electronic signals to the processing unit 504 through the link 503.
  • the processing unit 504 then processes the digitized electronic signals to determine whether the rotatable shaft 108 is within the rotation range (-L1, +L1).
  • the processing unit 504 sets the binary state output 111 of the indicating circuit 508 into a first signal state (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B) when the rotatable shaft 108 is within the rotation range (-L1, +L1); the processing unit 504 sets the binary state output 111 of the indicating circuit 508 into a second signal state (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B) when the rotatable shaft 108 is outside (or beyond) the rotation range (-L1, +L1).
  • a first signal state a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B
  • a second signal state a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B
  • the binary state output 111 of the indicating circuit 508 can be set either in a high voltage state (Vhigh) or a low voltage state (Vlow) depending on the two control signals on the links 505 and 507, namely, the state control signal (having a first control signal state and a second control signal state) on the link 505 and the trigger signal (or a trigger pulse) on the link 507.
  • the processing unit 504 applies a trigger pulse onto the link 507 and a state control signal onto the link 505
  • the indicating circuit 508 is set into a voltage state that is the same to that of the state control signal as being applied on the link 505.
  • the indicating circuit 508 When no trigger signal is applied onto the link 507, the indicating circuit 508 remains its current output state regardless the state signal being applied on the link 505.
  • the logic function of the indicating circuit 508 can be implemented by using a J-K register or a D register.
  • the processing unit 504 determines that the rotatable shaft 108 is within the rotation range (-L1, +L1), it applies a first control signal state (a high control state signal or a low control state signal) on the link 505 and a trigger signal on the link 507, which sets the indicating circuit 508 into the first signal state (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B).
  • a first control signal state a high control state signal or a low control state signal
  • the processing unit 504 determines that the rotatable shaft 108 is outside (or beyond) the rotation range (-L1, +L1), it applies a second control signal state (a low control state signal or a high control state signal) on the link 505 and a trigger signal on the link 507, which sets the indicating circuit 508 into the second signal state (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • a second control signal state a low control state signal or a high control state signal
  • FIG. 5B depicts another embodiment of the processing circuit 106 in the position sensing system 100 in greater detail.
  • the processing circuit 106' includes an analog processing unit 924 and a polarity circuit 928.
  • the analog processing unit 924 has an input that is coupled to the link 109 and an output that is coupled to the polarity circuit 928 through a link 925.
  • the polarity circuit 928 has an output that is coupled to the output terminal 111.
  • the analog processing unit 924 receives electronic signals from the sensing device 104 and processes them to generate a first state trigger signal when the rotatable shaft 108 is within the rotation range (-L1, +L1) and to generate a second state trigger signal when the rotatable shaft 108 is outside (or beyond) the rotation range (-L1, +L1).
  • the polarity circuit 928 is set to a first state signal (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B); in response to the second state trigger signal, the polarity circuit 928 is set to a second state signal (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • the processing unit 924 includes a threshold circuit for setting a threshold voltage.
  • a threshold voltage is calibrated (or simulated) using the process in connection with the description for Figures 8A-B.
  • the calibrated (or simulated) threshold voltage is then set within the analog processing unit 924.
  • the analog processing unit 924 When the sensed voltage from the sensing device 104 is greater or equal to the threshold voltage, the analog processing unit 924 generates a first state trigger signal to set the polarity circuit 928 into a first state signal (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B).
  • the analog processing unit 924 When the sensed voltage from the sensing device 104 is less than the threshold voltage, the analog processing unit 924 generates a second state trigger signal to set the polarity circuit 928 into a second state signal (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • the analog processing unit 924 can be implemented using a low-pass filter or some similar devices.
  • Figure 6 depicts the processing unit 504 shown in Figure 5 in greater detail.
  • the processing unit 504 includes a processor (or CPU) 602, a register 604, a memory device 606, an I/O circuit 608 and a buss 610.
  • the processor 602, register 604, memory device 606 and I/O circuit 608 are coupled to the buss 610 through links 603, 605, 607 and 609, respectively.
  • the memory device 606 can store programs (i.e., a set of instructions), parameters (such as the reference voltages as shown in Figures 7B and 8A) and data (including the digitized electronic signals), the registers 604 can store (or cache) the parameters and data, and the I/O circuit 608 can receive input signals into and send output signals out of the processing unit 504 (such as to the links 505 and 507).
  • the registers 604 can provide and remain signals based on the contents stored therein for one or more CPU operation cycles so that the processor 602 can perform operations within the CPU operation cycles.
  • the processor (or CPU) 602 can control the operation of the registers 604, memory device 606 and I/O circuit 608 and can perform reading/writing operations on the registers 604 and memory device 606.
  • the I/O circuit 608 can receive input signals from the A/D converter 502 and send out the output signals to the indicating circuit 508.
  • the processor (or CPU) 602 includes a logic operation unit (not shown) having a comparator 612, which can perform comparing operation from two sources of inputs 613 and 615 to generate a comparison result on output 617.
  • the processor (or CPU) 602 can determine the subsequent operation based on the comparison result on output 617.
  • the processor 602 can generate desirable state control signal and the trigger signal (or a trigger pulse) and send them to the links 505 and 507.
  • Figure 7A depicts two function lines (704, 706) that are generated by the sensing device
  • the sensing device 104 in response to the magnetic flux density changes and/or magnetic field changes in the air gap 183 D along Bx and By dimensions. Specifically, when the magnet device 102 is constantly rotating around the axis 112 of the rotatable shaft 108, the sensing device 104 generates electrical signals (or output voltages) that comply with the cos-shaped function line 704 and a sin-shaped curve function line 706 in response and proportional to the magnetic flux density changes and/or magnetic field changes generated by the magnet device 102 along Bx and By dimensions, respectively. These two function lines 704 and 706 can be observed from an oscilloscope while the magnet device 102 is rotating around the axis 112 if the output (at the link 109) of the sensing device 104 is applied to the oscilloscope.
  • the Y coordinate indicates the voltage changes on the cos-shaped line 704 and sin-shaped line 706 while the X coordinate indicates the rotation angle changes of the rotatable shaft 108.
  • the sensing device 104 can be implemented by using 3D Hall Sensing Devices available in the market, but only using its processing capabilities in two dimensions (i.e. X and Y dimensions). Doing so saves circuit design costs and reduces implementation time.
  • Figure 7B depicts a calibration (or simulation) process to generate a linear function 722 before installing the position sensing system 100 in field use.
  • a processing device In performing the calibration (or simulation) process, a processing device (such as the processing circuit 106 including the processing unit 504) processes the two sets of the analog electronic signals that comply with the cos-shaped line 704 and sin-shaped line 706 (shown in figure 7A) to generate a linear function line 722.
  • the voltage changes shown in Figure 7B are outputs/electronic signals that are proportional to the magnetic flux density changes Bx and By along both X and Y dimensions.
  • the Y coordinate indicates the voltage changes on the linear function line 722 while the X coordinate indicates the rotation angle changes on the rotatable shaft 108.
  • the A/D converter 502 receives the two sets of the analog electronic signals (that comply with the cos-shaped line 704 and sin-shaped line 706) from the sensing device 104, converts them into two sets of digital electronic signals, and applies the two sets of the digitized electronic signals to the I/O circuit 608 in the processing unit 504.
  • the processor (CPU) 602 in the processing unit 504 stores them into the memory device 606 and then transform the two sets of the digitized electronic signals into one set of the electronic signals that comply with the linear function line 722 shown in Figure 7B.
  • equation (4) equals to equation (5).
  • the two reference voltages on the function line 722 are adjusted/compensated so that the width and offset (positional offset) of the binary state outputs can be adjusted/compensated in response to the variations of operation conditions.
  • the processor (CPU) 602 further identifies two reference voltage points (or two reference voltages) Vfl and Vf2 in the calibration (or simulation) process. Specifically, as shown in Figure 7B, two reference voltages Vfl and Vf2 are identified in reference to the two rotation angles corresponding to the dotted lines 115 (-L1) and 117 (+L1), respectively. To keep the dotted lines 115 and 117 symmetrical to the center rotation angle corresponding to the dotted line 113, the processor (CPU) 602 can first identify the center reference voltage Vc in reference to the center dotted line 113 on the rotatable shaft 108.
  • FIG. 7C depicts a scheme to form a binary state signal 107 having a first signal state
  • the binary state signal 107 is formed by matching all voltage points (or voltages) on the linear function line 722 that are equal to or between the two reference voltage points (or voltages) as a first binary state signal (a high voltage Vhigh); and by matching all voltage points (including the two reference voltages) on the linear function line 722 that are smaller than the first reference voltage Vfl or is greater than the second reference voltage Vf2 as a second binary state signal (a low voltage Vlow).
  • the electronic signals as shown in Figures 7B-C can also be observed from an oscilloscope when the calibration (or simulation) outputs are applied to the oscilloscope.
  • the processor 602 identifies two pairs of voltage points on the linear function line 722 in the calibration (or simulation) process with each pair of the voltage points being clustered together (spaced at 0.2 degree for example). The processor 602 then assigns a first reference voltage Vfl to the first pair of the voltage points and assigns a second reference voltage Vf2 to the second pair of the voltage points.
  • a scheme has advantage of being able to use the existing 3D Hall Device (in which two pairs of reference voltages are availably provided) to implement the embodiments, thus saving costs and reducing design time.
  • the width and offset (or positional offset) of the binary state signal 107 can be compensated by adjusting the linear function line 722, which leads to the adjustment/compensation of the center reference voltage Vc and the two reference voltages Vfl and Vf2.
  • the offset of the binary state signal 107 here refers to the relative position of the binary state signal 107 in reference to rotation angle of the rotatable shaft 108.
  • Figure 8 A depicts a function line (704 or 706) shown in Figure 7 A, which is used in performing calibration (or simulation) process to generating a threshold reference voltage 712 (or 714).
  • the sensing device 104 when the magnet device 102 is constantly rotating around the axis 112 of the rotatable shaft 108, the sensing device 104 generates electrical signals that comply with the sin-shaped line 704 in response to the magnetic flux density changes/magnetic field changes generated by the magnet device 102 along the By dimension.
  • a processing device In performing the calibration (or simulation) process, a processing device (such as the processing circuit 106) processes the analog electronic signals that comply with the sin-shaped line 706 (shown in figure 7A) to generate a threshold voltage 712. Specifically, within the processing circuit 106, the A/D converter 502 receives analog electronic signals (that comply sin-shaped line 706) from the sensing device 104, converts them into digital electronic signals, and applies the digitized electronic signals to the I/O circuit 608 in the processing unit 504. After receiving the digitized electronic signals, the processor (CPU) 602 in the processing unit 504 stores them into the memory device 606 and then transform the digitized electronic signals into the threshold voltage 712 using the mathematical formula (6) as follows:
  • FIG. 8B depicts a scheme to form a binary state signal 107 having a first signal state (a high voltage Vhigh) and a second signal state (a low voltage Vlow) based on the sin-shaped line 706 in the calibration (or simulation) process.
  • the digital processing circuit 106 shown in Figure 5 A (or the analog processing circuit 106' shown in Figure 5B) generates the binary state signal 107 by matching all voltage points (or voltages) on the positive half-cycle of the sin-shaped line 706 that are equal to or greater than the threshold voltage 712 as a first binary state signal (a high voltage Vhigh); and by matching all voltage points (or voltages) on the positive half-cycle of the sin-shaped line 706 that are small than the threshold voltage 712 as a second binary state signal (a low voltage Vlow).
  • the electronic signals as shown in Figures 8A-B can be observed from an oscilloscope when the calibration (or simulation) outputs are applied to the oscilloscope.
  • the threshold voltage 712 should use a mathematical formula (7) as follows:
  • the digital processing circuit 106 shown in Figure 5 A (or the analog processing circuit 106 shown in Figure 5B) generates the binary state signal 107 by matching all voltage points (or voltages) on the negative half-cycle of the sin-shaped line 706 that are equal to or smaller than the threshold voltage 714 as a first binary state signal (a high voltage Vhigh); and by matching all voltage points (or voltages) on the negative half-cycle of the sin-shaped line 704 that are greater than the threshold voltage 714 as a second binary state signal (a low voltage Vlow).
  • the width of the binary state signal 107 can be compensated by adjusting the value of the threshold voltage 412.
  • the threshold voltage 712 (or 714) generated in the calibration (or simulation) process is stored into the memory device 606 so that the processing circuit 602 can later use them to detect the rotation range of the rotatable shaft 108 in field use.
  • the threshold voltage 712 (or 714) generated in the calibration (or simulation) process is set into the analog processing unit 924 so that the analog processing unit 924 can use it to detect the rotation range of the rotatable shaft 108 in field use.
  • the threshold based binary signal can provide adjustment/compensation capability only for width, not offset, it uses more simple electrical architecture (such as ID Speed Hall device) than the linear function based one (Multiple Dimension Hall Device).
  • Figures 8A-B illustrates the calibration (or simulation) process by using the sin- shaped line 706.
  • the principle in connection with Figures 8A-B also applies to the output of the con-shaped line 704 (as shown in Figure 7A) because, comparing with the cyclic sin-shaped line 706, the cyclic cos-shaped line 704 will match the cyclic sin-shaped line 706 if the cos-shaped line 704 is shifted by 90 degree.
  • the same principle can also be applied to the output of cos-shaped line 704.
  • the calibration (or simulation) process is performed by using the processing circuit 106.
  • any similar processing device can be used to perform the calibration (or simulation) process.
  • the electronic-contactless sensing devices inevitably encounter operating condition variations in manufacturing and/or in operation, including, but not limited to, the variations in air gaps, temperature and the parameter variations in the components used.
  • the adjustment/compensation capability is critical for measurement accuracy, especially for detecting the neutral position range for a gear shaft on automobile vehicles.
  • the basis for the adjustment/compensation is the usage of a binary state signal to indicate an angular position range.
  • the calibration (or simulation) process can be performed in field use by executing the calibration (or simulation) programs that are stored in the processing circuit 106.
  • the adjustment/compensation process can also be performed in field use by reprogramming the reference voltage(s) in the processing circuit 106.
  • Figures 9A-B illustrates that either a positive binary state signal 107 or a negative binary state signal 107' can be used to indicate the rotation range (-L1, +L1) for the rotatable shaft 108.
  • the digital processing circuit 106 when the rotatable shaft 108 is within the rotation range (-L1, +L1), the digital processing circuit 106 (or processing circuit 106') shown in Figure 5 A sets the indicating circuit 508 in a high voltage state Vhigh as indicated by line 907; when the rotatable shaft 108 is beyond (or outside of) the rotation range (-L1, +L1), the digital processing circuit 106 (or processing circuit 106') sets the indicating circuit 508 in a low voltage state Vlow as indicated by line 909.
  • the binary state signal 107' can be a reverse of the binary state signal 107. Therefore, in Figure 9B, when the rotatable shaft 108 is within the rotation range (-L1, +L1), the processing circuit 106 (or processing circuit 106') shown in Figure 5 A sets the indicating circuit 508 in a low voltage state Vlow as indicated by line 917; when the rotatable shaft 108 is beyond (or outside of) the rotation range (-L1, +L1), the processing unit 504 sets the indicating circuit 508 in a high voltage state Vhigh as indicated by line 919.
  • FIG 10 depicts an engine control system 900 in which the binary output 111 of the processing circuit 106 (or processing circuit 106') is used to control the engine in an automobile vehicle.
  • the engine control system 900 includes the sensing device 104, the processing circuit 106 and an ECU (Engine Control Unit) 902.
  • the rotatable shaft 108 is used as a gear shift lever and the rotation range (-L1, +L1) reflects the neutral position range of the gear shift lever.
  • the ECU (Engine Control Unit) 902 receives the binary state signal on link 111 as its input from the processing circuit 106 (or processing circuit 106') and receives the input 903 from clutch sensing circuitry (not shown) of the automobile vehicle.
  • the input 903 indicates whether the clutch of the automobile vehicle is being pressed.
  • the ECU 902 detects that the gear shift lever stays within the neutral position range based on the binary state signal on link 111 for a certain period of time (5 seconds for example), it shuts down the engine of the automobile vehicle to save gas.
  • the ECU 902 detects that the clutch of the automobile vehicle is being pressed based on the inputs on the link 903, the ECU 902 further detects whether the gear shift lever is within the neutral position range based on the binary state signal on link 111.
  • the ECU 902 starts the engine only when the gear shift lever is within the neutral position range. Therefore, the detection accuracy of the neutral position range for the gear shift lever is important to ensure the appropriate operation of the automobile vehicle. It should be appreciated that a narrow and/or symmetrical binary state signal 107 is especially desirable when the position sensing system 100 is used to detect the neutral position range for the gear shift lever in an automobile vehicle.
  • the digital processing circuit 106 as shown in Figure 5 A (or the analog processing circuit 106' as shown in Figure 5B) sets the indicating circuit 508 (or the polarity circuit 928 ) into the first signal state and the second signal state in response to the rotation of the rotatable shaft 108 using the steps as follows:
  • the sensing device 104 when the rotatable shaft 108 is being rotated with a rotation angle, the sensing device 104 generates electronic signals in response to the magnetic flux density changes and/or magnetic field changes caused by the magnet device 102 along X dimension and/or Y dimension.
  • the sensed voltages comply with the description in connection with Figures 7A-C or Figures 8A-B. If the sensed voltage is obtained using the process described in connection with Figures
  • the sensing device 104 generates two electrical signals that comply with the cos-shaped line 704 and sin-shaped line 706, respectively.
  • the processor (CPU) 602 transforms them to one sensed voltage by using the Equations (1-5) in connection with Figures 7A-C. Therefore, the sensed voltage should comply with the liner function line 722 shown in Figure 7B. If the sensed voltage is obtained using the process in connection with Figures 8A-B, the sensing device 104 generates one electrical signal that comply with the cos-shaped line 704 or sin-shaped line 706 and sends the electrical signal to the processor (CPU) 602. Therefore, the sensed voltage should comply with the cos-shaped line 704 or sin-shaped curve 706 shown in Figure 7 A.
  • the processor (CPU) 602 compares the sensed voltage with the two reference voltages Vfl and Vf2. In the comparison, if the value of the sensed voltage is equal to one of, or is between, the values of the two reference voltages Vfl and Vf2, the processor (CPU) 602 generates corresponding state control signal and trigger signal on the links 505 and 507, respectively, to set the indicating circuit 508 into a first signal state (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B).
  • the processor (CPU) 602 If the value of the sensed voltage is smaller than the first reference voltage Vfl or is greater than the second reference voltage Vf2, the processor (CPU) 602 generates corresponding state control signal and trigger signal on the links 505 and 507, respectively, to set the indicating circuit 508 into a second signal state (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • the processor (CPU) 602 compares the sensed voltage with the threshold voltage 712 (or 714).
  • the processor (CPU) 602 If the value of the sensed voltage is equal to or is greater than the threshold voltage 712 (or the value of the sensed voltage is equal to or is smaller than the threshold voltage 714), the processor (CPU) 602 generates corresponding state control signal and trigger signal on the links 505 and 507, respectively, to set the indicating circuit 508 into a first signal state (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B).
  • the processor (CPU) 602 If the value of the sensed voltage is smaller than the threshold voltage 712 (or the value of the sensed voltage is greater than the threshold voltage 714), the processor (CPU) 602 generates the corresponding state control signal and trigger signal on the links 505 and 507, respectively, to set the indicating circuit 508 into a second signal state (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • the two reference voltages Vfl and Vf2, or the two threshold voltages 712 and 714 are stored in the registers 604 in the processing unit 504.
  • the sensed voltage is applied to the input 613 of the comparator 612 and the two reference voltages Vfl and Vf2, or one of the two threshold voltages 712 and 714) are applied to the input 615 of the comparator 612.
  • the processor (CPU) 602 obtains the comparison results from the output 617 of the comparator 612. Based on the comparison results from the output 617, the processor (CPU) 602 generates the state control signal and trigger signal on the links 505 and 506.
  • the programs (or instruction sets) to perform the specific steps for setting the indicating circuit 508 can be stored in the memory device 606 and executed by the processor (CPU) 602.
  • the sensing device 104 when the rotatable shaft 108 is being rotated with a rotation angle, the sensing device 104 generates an electronic signal in response to the magnetic flux density changes and/or magnetic field changes caused by the magnet device 102 along one dimension (X dimension and/or Y dimension).
  • the sensed electronic signal complies with descriptions in connection with Figures 8A-B.
  • the analog processing unit 924 When the sensed voltage of the electric signal from the sensing device 104 is greater or equal to the threshold voltage, the analog processing unit 924 generates a first state trigger signal to set the polarity circuit 928 into a first state signal (a high voltage state Vhigh as shown in Figure 3 or a low voltage state Vlow as shown in Figure 9B). When the sensed voltage of the electric signal from the sensing device 104 is less than the threshold voltage, the analog processing unit 924 generates a second state trigger signal to set the polarity circuit into a second state signal (a low voltage state Vlow as shown in Figure 3 or a high voltage state Vhigh as shown in Figure 9B).
  • the present disclosure provides a feasible architecture by utilizing 3D hall technology (linear based) or speed sensor (threshold based) technology to enable logic binary input signal with improves measurement accuracy and reliability.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

La présente invention concerne un détecteur permettant de détecter une plage de positions angulaires d'un arbre rotatif. Le détecteur selon l'invention comprend un circuit d'indication permettant de générer un signal d'état binaire comportant un premier état de signal et un second état de signal en réponse à la rotation d'un dispositif à aimant bipolaire qui est fixé sur l'arbre rotatif (108) et qui est apte à tourner conjointement avec l'arbre rotatif; et un circuit d'ajustement permettant d'ajuster le signal d'état binaire afin de compenser des variations de conditions de fonctionnement du détecteur. Le signal d'état binaire se trouve dans le premier état de signal lorsque l'arbre rotatif se situe dans la plage de positions angulaires et le signal d'état binaire se trouve dans le second état de signal lorsque l'arbre rotatif se situe au-delà de la plage de positions angulaires. La largeur et/ou le décalage du signal d'état binaire du détecteur peuvent être ajustés pour une compensation en réponse à des variations des conditions de fonctionnement.
PCT/IB2013/052977 2012-04-16 2013-04-15 Dispositif de détection de position angulaire et son procédé de fabrication WO2013156916A1 (fr)

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EP3018452A1 (fr) * 2014-11-05 2016-05-11 Pierburg GmbH Systeme de mesure base sur un aimant destine a detecter un mouvement et/ou une position angulaire d'un composant
US10534044B2 (en) 2013-10-30 2020-01-14 Te Connectivity Germany Gmbh Temperature compensation method of magnetic control fields in a hall sensor with OS adaption

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CN105526852B (zh) * 2014-09-30 2019-07-12 泰科电子(上海)有限公司 空挡倒挡位置感测传感器和系统
CN104455404A (zh) * 2014-11-24 2015-03-25 长城汽车股份有限公司 一种空挡位置传感器、变速器及汽车
EP3163256B1 (fr) * 2015-10-26 2019-12-04 TE Connectivity Germany GmbH Capteur d'angle
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CN109963055B (zh) * 2017-12-25 2021-09-17 宏碁股份有限公司 电子装置及其操作方法

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EP3018452A1 (fr) * 2014-11-05 2016-05-11 Pierburg GmbH Systeme de mesure base sur un aimant destine a detecter un mouvement et/ou une position angulaire d'un composant
EP3018452B1 (fr) 2014-11-05 2018-11-07 Pierburg GmbH Systeme de mesure base sur un aimant destine a detecter un mouvement et/ou une position angulaire d'un composant

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