WO2018230242A1 - ポジションセンサ - Google Patents

ポジションセンサ Download PDF

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Publication number
WO2018230242A1
WO2018230242A1 PCT/JP2018/019059 JP2018019059W WO2018230242A1 WO 2018230242 A1 WO2018230242 A1 WO 2018230242A1 JP 2018019059 W JP2018019059 W JP 2018019059W WO 2018230242 A1 WO2018230242 A1 WO 2018230242A1
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WO
WIPO (PCT)
Prior art keywords
detection
signal
position sensor
signals
unit
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/019059
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
篤史 小林
靖寛 北浦
真宏 巻田
章人 佐々木
徹哉 近江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Priority to DE112018003016.4T priority Critical patent/DE112018003016T5/de
Priority to CN202210409607.XA priority patent/CN114754802B/zh
Priority to CN201880038375.3A priority patent/CN110753828B/zh
Publication of WO2018230242A1 publication Critical patent/WO2018230242A1/ja
Priority to US16/676,645 priority patent/US20200072593A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K20/00—Arrangement or mounting of change-speed gearing control devices in vehicles
    • B60K20/02—Arrangement or mounting of change-speed gearing control devices in vehicles of initiating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/08—Range selector apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • 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
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • 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
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement
    • G01P13/02—Indicating direction only, e.g. by weather vane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2312/00—Driving activities
    • F16H2312/12—Parking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status

Definitions

  • This disclosure relates to a position sensor that outputs a signal corresponding to a position to be detected.
  • Patent Document 1 a linear position sensor including a permanent magnet, a magnetic field sensor, and an evaluation circuit has been proposed in Patent Document 1, for example.
  • the permanent magnet and the magnetic field sensor can move relative to each other along the movement path.
  • the magnetic field sensor generates an output signal determined by the direction of the magnetic field.
  • the evaluation circuit converts the output signal of the magnetic field sensor into a signal that is directly proportional to the path being measured.
  • the detection target is a magnet itself or a magnet mounted thereon, additional processing of the detection target or assembly of the magnet is required. For this reason, the number of processes, the number of assembling steps, and the number of parts increase, causing a detection position error. Further, a detection position error also occurs due to a signal shift at the interface unit or an A / D conversion error being included in the directly proportional signal.
  • This disclosure is intended to provide a position sensor that can suppress the occurrence of a detection position error.
  • a position sensor includes a plurality of sensor elements arranged in one direction along a moving direction of a detection target based on a change in a magnetic field received from the detection target with the movement of the detection target formed of a magnetic material. And a detection unit that generates a plurality of detection signals with different phase differences.
  • the position sensor acquires a plurality of detection signals from the detection unit, compares the plurality of detection signals with a threshold value, and selects one of a plurality of ranges based on a combination of magnitude relationships between the plurality of detection signals and the threshold value.
  • a signal processing unit for specifying the position of the detection target as a position in the range.
  • the detection unit since the detection unit detects the position under the influence of the magnetic field from the detection target, the detection target does not necessarily include a magnet. For this reason, the number of processes, the number of assembling steps, and the number of parts do not increase, and a detection position error due to a magnet does not occur. Further, since the signal processing unit detects the position of any one of the plurality of ranges to be detected, a detection position error due to the signal misalignment or A / D conversion error being included in the signal does not occur. Therefore, occurrence of a detection position error can be suppressed.
  • FIG. 1 is an external view of a position sensor according to the first embodiment of the present disclosure.
  • FIG. 2 is an exploded perspective view of components constituting a magnetic detection method using a magnetoresistive element
  • FIG. 3 is a plan view of each component shown in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
  • FIG. 5 is a diagram for explaining a detection signal by the magnetoresistive element
  • FIG. 6 is a plan view showing components constituting a magnetic detection method using a Hall element
  • 7 is a sectional view taken along line VII-VII in FIG.
  • FIG. 1 is an external view of a position sensor according to the first embodiment of the present disclosure.
  • FIG. 2 is an exploded perspective view of components constituting a magnetic detection method using a magnetoresistive element
  • FIG. 3 is a plan view of each component shown in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
  • FIG. 5 is a diagram for explaining a detection signal
  • FIG. 8 is a diagram for explaining a detection signal by the Hall element.
  • FIG. 9 is a diagram showing a circuit configuration of the position sensor
  • FIG. 10 is a diagram showing detection signals, state determinations, and position signals when detecting three states.
  • FIG. 11 is a diagram showing a case where four states are determined as a modification.
  • FIG. 12 is a diagram showing a case where a detection signal is generated from the outputs of two element pairs as a modified example.
  • FIG. 13 is a diagram showing a case where a detection signal is generated from outputs of three element pairs as a modification.
  • FIG. 14 is a diagram showing a case where a detection signal is generated from the outputs of five element pairs as a modification, FIG.
  • FIG. 15 is a diagram showing a case in which three detection signals are generated from the outputs of four element pairs and five states are determined as a modification.
  • FIG. 16 is a diagram showing a case where, as a modification, three detection signals are generated from outputs of three element pairs and six states are determined
  • FIG. 17 is a diagram showing a case where four detection signals are generated from the outputs of four element pairs and the seven states are determined as a modification.
  • FIG. 18 is a diagram showing a case in which four detection signals are generated from outputs of five element pairs and eight states are determined as a modification.
  • FIG. 19 is a diagram showing a case in which seven states are determined using two threshold values as a modified example.
  • FIG. 20 is a diagram showing a case where three states are determined from the outputs of three Hall elements as a modification.
  • FIG. 21 is a view showing a modification of the shaft
  • FIG. 22 is a diagram illustrating an example of a detection target.
  • FIG. 23 is a diagram illustrating an example of a detection target.
  • FIG. 24 is a view showing a shaft according to the second embodiment
  • FIG. 25 is a diagram showing detection signals, state determinations, and position signals when detecting three states for the shaft shown in FIG.
  • FIG. 26 is a diagram showing a case where four states are determined as a modification.
  • FIG. 27 is a diagram illustrating an example of a detection target.
  • FIG. 28 is a diagram illustrating an example of a detection target; and
  • FIG. 29 is a diagram showing discrete pulse widths when determining three states in the third embodiment.
  • the position sensor according to the present embodiment is a sensor that detects which range (state) the position of the detection target is in and outputs a signal corresponding to the range.
  • the position sensor 100 detects the position of the shaft 200 interlocked with the operation of the shift position of the vehicle as a detection target. Specifically, the position sensor 100 acquires the state of the shaft 200 by detecting a signal corresponding to the position of the protrusion 201 provided on the shaft 200.
  • the state of the shaft 200 means the position of the shaft 200 when the shift position is operated by the user.
  • the shaft 200 moves in conjunction with parking at the shift position.
  • the shaft 200 moves in the axial direction.
  • the shaft 200 reflects the state of parking.
  • the position sensor 100 detects the position of the shaft 200 in front of the protrusion 201.
  • the shaft 200 reflects a state other than parking.
  • the position sensor 100 detects the protrusion 201 and the position behind the protrusion 201 in the shaft 200.
  • the shaft 200 may be moved in conjunction with a position other than parking.
  • the shaft 200 is entirely made of a magnetic material, for example.
  • the shaft 200 may have a surface facing the position sensor 100 of the protruding portion 201 formed of a magnetic material, and the other portion formed of another metal material.
  • the position sensor 100 includes a case 101 formed by resin molding of a resin material such as PPS.
  • the case 101 has a tip portion 102 on the shaft 200 side, a flange portion 103 fixed to the peripheral mechanism, and a connector portion 104 to which a harness is connected.
  • a sensing portion is provided inside the tip portion 102.
  • the position sensor 100 is fixed to the peripheral mechanism via the flange portion 103 so that the tip portion 102 has a predetermined gap with respect to the protruding portion 201 of the shaft 200. Accordingly, the shaft 200 moves with respect to the position sensor 100.
  • the position sensor 100 may be fixed to a peripheral mechanism so as to detect the position of a valve that operates in conjunction with the shaft 200.
  • the moving direction of the shaft 200 is not limited to linear movement or reciprocation, but may be rotation, reciprocation within a specific angle, or the like.
  • the position sensor 100 can be applied to state detection such as the position, movement, and rotation of the movable part that moves in conjunction with the operation of the shift position of the vehicle.
  • the position sensor 100 can employ a magnetic detection method using a magnetoresistive element or a magnetic detection method using a Hall element.
  • the position sensor 100 includes a mold IC unit 105, a magnet 106, and a holding unit 107. These are housed in the tip portion 102 of the case 101.
  • the mold IC part 105 is inserted into the hollow cylindrical magnet 106.
  • the magnet 106 is inserted into the bottomed cylindrical holding portion 107.
  • the mold IC part 105, the magnet 106, and the holding part 107 are integrated.
  • the main part of the mold IC part 105 is located in the hollow part of the magnet 106.
  • the holding unit 107 fixes the positions of the mold IC unit 105 and the magnet 106.
  • the mold IC part 105 includes a lead frame 108, a processing circuit chip 109, a sensor chip 110, and a mold resin part 111.
  • the lead frame 108 has a plate-like island portion 112 and a plurality of leads 113 to 115.
  • the island part 112 is arranged so that the plane part is perpendicular to the moving direction of the detection target.
  • the plurality of leads 113 to 115 correspond to a power supply terminal 113 to which a power supply voltage is applied, a ground terminal 114 to which a ground voltage is applied, and an output terminal 115 for outputting a signal. That is, each of the leads 113 to 115 has three wires for power supply, ground, and signal. Terminals 116 are connected to the tips of the leads 113 to 115, respectively. The terminal 116 is located in the connector part 104 of the case 101. A terminal 116 is connected to the harness.
  • the ground lead 114 among the plurality of leads 113 to 115 is integrated with the island portion 112.
  • the island portion 112 and all the leads 113 to 115 may be completely separated.
  • the processing circuit chip 109 and the sensor chip 110 are mounted on the island portion 112 with an adhesive or the like.
  • the processing circuit chip 109 constitutes a circuit unit that processes signals from the sensor chip 110.
  • the sensor chip 110 includes a magnetoresistive element whose resistance value changes when affected by a magnetic field from the outside.
  • the magnetoresistive element is, for example, AMR, GMR, or TMR.
  • Each lead 113 to 115 and the processing circuit chip 109 are electrically connected via a wire 117.
  • the processing circuit chip 109 and the sensor chip 110 are electrically connected via a wire 118.
  • the mold resin part 111 seals the island part 112, a part of each of the leads 113 to 115, the processing circuit chip 109, and the sensor chip 110.
  • the mold resin portion 111 is molded into a shape that is fixed to the hollow portion of the magnet 106.
  • the holding unit 107 is arranged with a predetermined gap with respect to the protrusion 201 that is a detection target.
  • the detection signal becomes maximum at the center of the movement direction of the protrusion 201.
  • the gap increases, the amplitude of the detection signal decreases, and when the gap decreases, the amplitude of the detection signal increases.
  • the detection signal is generated by outputs of a plurality of magnetoresistive elements.
  • the mold IC part 105 When the magnetic detection method using the Hall element is adopted, the mold IC part 105 is inserted into the holding part 107 and fixed as shown in the schematic plan view of FIG. 6 and the schematic sectional view of FIG.
  • the mold IC part 105 includes a lead frame 108, an IC chip 119, a magnet 120, and a mold resin part 111.
  • the island part 112 of the lead frame 108 is arranged so that the plane part is parallel to the moving direction of the detection target.
  • the leads 113 to 115 are arranged so as to be perpendicular to the moving direction of the detection target.
  • a ground lead 114 is integrated with the island portion 112 at a right angle. Terminals 116 are connected to the tips of the leads 113 to 115, respectively.
  • the IC chip 119 includes a plurality of hall elements and a signal processing circuit unit. That is, the magnetic detection system using the Hall element has a one-chip configuration.
  • the magnet 120 is fixed to the surface of the island part 112 opposite to the IC chip 119.
  • Each lead 113 to 115 and the IC chip 119 are electrically connected via a wire 121.
  • the mold resin part 111 is molded into a shape that is fixed to the hollow part of the holding part 107.
  • a detection signal by a magnetic detection method using a Hall element will be described. As shown in FIG. 8, for example, when two Hall elements (X, Y) are arranged above the magnet 120, when the protrusion 201 moves with respect to the holding portion 107, each Hall element (X, Y ), Each detection signal becomes maximum. The relationship between the gap and the amplitude of the detection signal is the same as in the magnetic detection method using the magnetoresistive element. By setting a threshold value for each detection signal, the position of the protrusion 201 can be detected.
  • a magnetoresistive element that detects a magnetic vector has an advantage that an accuracy error due to a gap shift can be canceled. Further, there is a merit that the influence of the stress generated in the sensor chip 110 can be reduced or canceled. Therefore, highly accurate detection is possible.
  • the circuit configuration configured in the sensor chip 110 and the processing circuit chip 109 will be described.
  • the position sensor 100 and the controller 300 are electrically connected via a harness 400.
  • the harness 400 is constituted by three wires.
  • the controller 300 is, for example, a transmission controller (TCU).
  • the controller 300 includes a power supply unit 301, a control unit 302, and a ground unit 303.
  • the power supply unit 301 is a circuit unit that supplies a power supply voltage to the position sensor 100.
  • the control unit 302 is a circuit unit that performs predetermined control according to an output signal input from the position sensor 100.
  • the ground unit 303 is a circuit unit that sets the ground voltage of the position sensor 100.
  • the controller 300 may be configured as an electronic control unit (ECU).
  • the position sensor 100 includes a detection unit 122 and a signal processing unit 123.
  • the detection unit 122 is provided in the sensor chip 110.
  • the signal processing unit 123 is provided in the processing circuit chip 109.
  • the detection unit 122 and the signal processing unit 123 operate based on the power supply voltage and the ground voltage supplied from the controller 300.
  • the detection unit 122 generates a plurality of detection signals corresponding to a plurality of ranges along the moving direction of the shaft 200 and having different phase differences based on a change in the magnetic field received from the shaft 200 as the shaft 200 moves. .
  • the plurality of ranges along the moving direction of the shaft 200 are not arranged in parallel along the moving direction of the shaft 200, but are arranged in one direction along the moving direction of the shaft 200. Are lined up.
  • the detection unit 122 includes a first magnetoresistive element pair 124, a second magnetoresistive element pair 125, and a third magnetoresistive element pair 126 whose resistance values change as the protrusion 201 moves. 3 element pairs.
  • Each is arranged so that the second magnetoresistive element pair 125 is positioned between the first magnetoresistive element pair 124 and the third magnetoresistive element pair 126 in the moving direction of the protrusion 201. That is, the second magnetoresistive element pair 125 is disposed so as to be sandwiched between the first magnetoresistive element pair 124 and the third magnetoresistive element pair 126.
  • a bias magnetic field along the central axis of the magnet 106 is applied to the second magnetoresistive element pair 125.
  • a bias magnetic field for winding the end of the magnet 106 is applied to the first magnetoresistive element pair 124 and the third magnetoresistive element pair 126.
  • Each of the magnetoresistive element pairs 124 to 126 is configured as a half bridge circuit in which two magnetoresistive elements are connected in series between a power source and a ground. Each of the magnetoresistive element pairs 124 to 126 detects a change in resistance value when the two magnetoresistive elements are affected by the magnetic field as the protrusion 201 moves. Each of the magnetoresistive element pairs 124 to 126 outputs the voltage at the midpoint between the two magnetoresistive elements as a waveform signal based on the change in the resistance value. In the configuration in which each of the magnetoresistive element pairs 124 to 126 is driven by a current source, the voltage across each of the magnetoresistive element pairs 124 to 126 becomes a waveform signal.
  • the detection unit 122 includes first to fourth operational amplifiers (not shown) in addition to the magnetoresistive element pairs 124 to 126.
  • first operational amplifier has V1-V2 as It is a differential amplifier configured to calculate and output the result as R1.
  • the second operational amplifier is a differential amplifier configured to calculate V2-V3 and output the result as R2. is there.
  • the third operational amplifier inputs the midpoint potential V1 from the midpoint of the first magnetoresistive element pair 124, and also inputs the midpoint potential V3 from the midpoint of the third magnetoresistive element pair 126, and calculates V1-V3.
  • the differential amplifier is configured to output the result as S1.
  • the signal S ⁇ b> 1 is a signal having a waveform in which the amplitude is maximum at the center of the movement direction of the protrusion 201 of the shaft 200 and is minimum at a position away from the protrusion 201.
  • the signal of S2 is a waveform signal corresponding to the concavo-convex structure of the protrusion 201 of the shaft 200.
  • the signal S2 is a signal having a waveform in which the amplitude is maximum at one edge portion where the protrusion 201 of the shaft 200 is switched from the concave to the convex and the amplitude is minimum at the other edge portion where the convex is switched to the concave.
  • This signal S2 is a waveform signal having a phase difference with respect to the signal S1.
  • the detection unit 122 outputs the signal S1 and the signal S2 to the signal processing unit 123 as detection signals.
  • the signal processing unit 123 in FIG. 9 acquires each detection signal from the detection unit 122, compares each detection signal with a threshold value, and based on a combination of magnitude relationships between each detection signal and the threshold value, The position of the shaft 200 is specified as the position of any one of the ranges. In addition, the signal processing unit 123 outputs the position of the shaft 200 to the controller 300.
  • the signal processing unit 123 includes a processing unit 127 and an output circuit unit 128.
  • the processing unit 127 inputs each detection signal from the detection unit 122 and specifies the position of the protrusion 201 based on each detection signal. For this reason, the processing unit 127 has a common threshold for each detection signal.
  • the processing unit 127 compares the signals S1 and S2, which are detection signals, with a threshold value.
  • the processing unit 127 determines Hi when the signals S1 and S2 are larger than the threshold, and determines Lo when the signals S1 and S2 are smaller than the threshold.
  • the processing unit 127 determines which range of the shaft 200 the detection unit 122 has detected from the Hi / Lo combination of the signals S1 and S2.
  • the detection unit 122 detects the range on the left side of the drawing from the protrusion 201 of the shaft 200. That is, the processing unit 127 has specified the position of the shaft 200.
  • the state of the shaft 200 when the position of the range is specified is referred to as “state A”.
  • the detection unit 122 has detected the range of the protrusion 201 in the shaft 200.
  • the Hi / Lo of the signal S2 does not matter. Therefore, the state of the shaft 200 when the position of the range is specified is referred to as “state B”.
  • the detection unit 122 has detected the range on the right side of the drawing from the protrusion 201 in the shaft 200.
  • the state of the shaft 200 when the position of the range is specified is referred to as “state C”.
  • the processing unit 127 specifies the position of the shaft 200 as a position in any one of a plurality of ranges along the moving direction of the shaft 200.
  • the output circuit unit 128 is a circuit unit that outputs a position signal indicating one of the states A to C to the controller 300 based on the determination result of the processing unit 127. First, the output circuit unit 128 acquires information on the states A to C determined based on the detection signal from the processing unit 127. Further, the output circuit unit 128 outputs a position signal having a value corresponding to the specified position range among the discrete values respectively set in the plurality of ranges to the controller 300.
  • the discrete position signal is a voltage signal having a different voltage value.
  • the state A is V H
  • the state B is V M
  • the state C is V L , so that the voltage values indicating the states A to C are set to discrete values so that the states A to C do not overlap. Is done.
  • the magnitude relationship between the voltage values is V H > V M > V L. Since it is sufficient that the discrete values do not overlap in the states A to C, the discrete values may be set as any voltage value within a predetermined voltage range.
  • the predetermined voltage range may be the same in each of the states A to C, for example, within 1V, or may be different, for example, within 1V in the state A but within 2V in the state B.
  • the position signal becomes a stepwise discrete voltage value.
  • the voltage value of the position signal may increase or decrease instantaneously due to noise, thereby reaching a voltage value indicating another state.
  • the control unit 302 of the controller 300 can almost eliminate the influence of noise by reading the voltage value for a predetermined time. That is, the position sensor 100 can output a position signal with high noise resistance.
  • the above is the configuration of the position sensor 100 according to the present embodiment.
  • the controller 302 of the controller 300 inputs a position signal from the position sensor 100 and uses it for desired control. For example, the control of turning on / off the parking lamp of the vehicle meter unit, the control of permitting or disallowing other control depending on whether or not the shift position is in parking, and the position sensor 100 in the case of a failure of the position sensor 100 Control that is not used, lighting control of the failure lamp, and the like.
  • control unit 302 may input a signal other than the position signal.
  • This signal is a signal that cannot originally occur as an output of the position sensor 100. In this case, it is considered that a failure other than the position sensor 100 is the cause. For example, a failure of a communication device such as the harness 400. Therefore, the controller 300 can detect a failure of the communication device.
  • four states can be determined from the detection signal.
  • the state is “state A”
  • the state is “state B”
  • the state is “state B”
  • the case where the signal S1 is Lo and the signal S2 is Lo is“ state D ”.
  • the four states may be set to four discrete voltage values (V H > V M1 > V M2 > V L ).
  • three states can be determined from two element pairs of the first magnetoresistive element pair 124 and the second magnetoresistive element pair 125.
  • the processing unit 127 sets “state A” when the signal S3 is Lo and the signal S4 is Hi, sets “state B” when the signal S3 is Hi, and sets the signal S3 is Lo and the signal S4 is Lo. Is determined as “state C”.
  • the three states are output as three discrete voltage values (V H , V M , V L ).
  • the three states can be determined from the two element pairs of the first magnetoresistive element pair 124 and the second magnetoresistive element pair 125.
  • the state determination in this modification is the same as in FIG.
  • the detection unit 122 includes a first magnetoresistive element pair 124, a second magnetoresistive element pair 125, a third magnetoresistive element pair 126, a fourth magnetoresistive element pair 129, 5 element pairs of 5 magnetoresistive element pairs 130 are provided.
  • Each of the magnetoresistive element pairs 124 to 126, 129, and 130 outputs midpoint potentials V1 to V5, respectively.
  • the detection unit 122 includes four magnetoresistive element pairs 124 to 126, 129 as shown in FIG.
  • the processing unit 127 sets “state A” when the signal S9 is Lo, the signal S10 is Hi, and the signal S11 is Hi, and determines that the signal S9 is Hi, the signal S10 is Hi, and the signal S11 is Hi. Is determined.
  • the processing unit 127 sets “state C” when the signal S9 is Hi, the signal S10 is Lo, and the signal S11 is Hi, and sets the state when the signal S9 is Hi, the signal S10 is Lo, and the signal S11 is Lo as “state D”. Is determined. Further, the processing unit 127 determines that the signal S9 is Lo, the signal S10 is Lo, and the signal S11 is Lo as “state E”. In this case as well, the five states are output as five discrete voltage values as described above.
  • the detection unit 122 includes three magnetoresistive element pairs 124 to 126.
  • the processing unit 127 determines the six states A to F based on the combination of the three signals S12, S13, and Hi / Lo of the signal S14, as in the above modification. In this case as well, the six states are output as six discrete voltage values as described above.
  • the detection unit 122 has four magnetoresistive element pairs 124 to 126, 129.
  • -V2-V4) is generated and obtained.
  • four detection signals having different phase differences are obtained from the outputs of the four element pairs.
  • the processing unit 127 determines the seven states A to G based on the combination of Hi / Lo of the four signals S15, S16, S17, and S18, as in the above modification. In this case as well, the seven states are output as seven discrete voltage values as described above.
  • the detection unit 122 has five magnetoresistive element pairs 124 to 126, 129, and 130.
  • four detection signals having different phase differences are obtained from the outputs of the five element pairs.
  • the processing unit 127 determines the eight states A to H based on the combination of Hi / Lo of the four signals S19, S20, S21, and S22 as in the above modification. In this case as well, the eight states are output as eight discrete voltage values as described above.
  • the detection unit 122 includes three magnetoresistive element pairs 124 to 126.
  • two detection signals having different phase differences are obtained from the outputs of the three element pairs.
  • the processing unit 127 has a first threshold value and a second threshold value.
  • the second threshold is a value smaller than the first threshold.
  • the processing unit 127 compares each signal S23, S24 with each threshold value. In this case, the processing unit 127 sets Hi when the signal is larger than the first threshold, Mid when the signal is between the first threshold and the second threshold, and Lo when the signal is smaller than the second threshold.
  • the processing unit 127 sets “state A” when the signal S23 is Lo and the signal S24 is Hi, sets “state B” when the signal S23 is Mid and the signal S24 is Hi, the signal S23 is Hi, and the signal S24. Is determined as “state C”. Further, the processing unit 127 determines that the signal S23 is Hi and the signal S24 is Mid and is “state D”, and the signal S23 is Hi and the signal S24 is Lo is determined to be “state E”. Further, the processing unit 127 determines that the signal S23 is Mid and the signal S24 is Lo as “State F”, and determines that the signal S23 is Lo and the signal S24 is Lo as “State G”.
  • the number of states that can be determined can be changed by using a plurality of threshold values.
  • the threshold value is not limited to two, and three or more threshold values may be provided.
  • the seven states are output as seven discrete voltage values in the same manner as described above.
  • the detection unit 122 is configured to detect a change in the magnetic field accompanying the movement of the shaft 200 by the three Hall elements 131 to 133 arranged on the magnet 120. May be.
  • the processing unit 127 determines the three states A to C based on the combination of the two signals S25 and Hi / Lo of the signal S26, as in the above modification. In this case as well, the three states are output as three discrete voltage values as described above.
  • the shaft 200 may have a shape in which a cylinder is inserted into a rectangular block.
  • the detection target may be a plate member 202 in which a square block is provided on a plane portion of a square plate instead of the shaft 200.
  • the detection target may be a fan member 203 in which a square block is provided on a flat portion of a fan-shaped plate.
  • the detection target is provided with a reference unit between the first moving unit and the second moving unit, and the transition from the first moving unit to the reference unit and the transition from the second moving unit to the reference unit. It suffices if the structure changes at the same time.
  • the reference portion protrudes from the first moving portion and the second moving portion.
  • the transition from the first moving unit to the reference unit and the transition from the second moving unit to the reference unit correspond to the transition from the concave state to the convex state. In this way, the detection target only needs to have a shape that divides the detection range into a plurality of ranges.
  • the position sensor 100 specifies any one of the plurality of ranges of the shaft 200 that is the detection target, and outputs a position signal corresponding to the position of the specified range. It is a feature.
  • the detection unit 122 detects the position under the influence of the magnetic field from the shaft 200, it is not always necessary to provide a magnet as a detection target on the protrusion 201 of the shaft 200. For this reason, the number of processes, the number of assembly steps, and the number of parts in the detection target do not increase, and a detection position error due to the detection target magnet does not occur.
  • the signal processing unit 123 is configured to detect the position of the projection 201 as a detection target as the state of the shaft 200. For this reason, a detected position error due to a signal shift of the position signal and an A / D conversion error included in the position signal does not occur. Therefore, occurrence of a detection position error can be suppressed.
  • the signal processing unit 123 is configured to output each state as a discrete voltage value. For this reason, since a reading margin can be provided on the controller 300 side, each state is not erroneously determined even when noise is superimposed, and noise tolerance is high. Thus, the detection position error due to noise can be reduced, and the robustness against the detection position error can be improved. Therefore, the accuracy of the output of the position sensor 100 can be ensured.
  • the shaft 200, the plate member 202, and the fan member 203 correspond to detection targets, and the controller 300 corresponds to an external device.
  • the shaft 200 has a recess 204 that is partially recessed in the radial direction.
  • the processing unit 127 can determine the three states by generating the signal S1 and the signal S2 from the detection signals of the magnetoresistive element pairs 124 to 126.
  • the processing unit 127 determines the three states A to C based on the combination of Hi / Lo of the two signals S27 and S28, as in the first embodiment. Also in this case, the processing unit 127 outputs the three states as three discrete voltage values in the same manner as described above.
  • the four states A to D may be determined by the combination of Hi / Lo of the two signals S27 and S28.
  • the four states are output as four discrete voltage values as described above. Note that, as in the first embodiment, the number of signals may be changed, or the number of states to be determined may be changed.
  • the detection target may be a plate member 202 provided with a window 205.
  • the detection target may be a fan member 203 provided with a window 205.
  • the reference portion is recessed with respect to the first moving portion and the second moving portion. The transition from the first moving unit to the reference unit and the transition from the second moving unit to the reference unit correspond to the transition from the convex state to the concave state. In this way, the detection target only needs to have a shape that divides the detection range into a plurality of ranges.
  • the output circuit unit 128 outputs pulse signals having different pulse widths to the controller 300 as signals having discrete values. That is, the discrete value signal is a PWM signal.
  • the discrete values are a pulse width value, a signal period, a duty ratio, and the like.
  • the pulse width of the signal corresponding to the state A is set to be the smallest, and the pulse width of the signal corresponding to the state C is set to be the largest.
  • the pulse width of the signal corresponding to the state B is set between the pulse widths of the signals corresponding to the states A and C. Similar to the first embodiment, it is possible to improve resistance to noise.
  • the configuration of the position sensor 100 shown in each of the above embodiments is an example, and is not limited to the configuration shown above, and other configurations that can realize the present disclosure can be used.
  • the use of the position sensor 100 is not limited to a vehicle, and can be widely used for industrial robots, manufacturing facilities, and the like as detecting the position of a movable part.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Control Of Transmission Device (AREA)
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CN201880038375.3A CN110753828B (zh) 2017-06-14 2018-05-17 位置传感器
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CN114754802B (zh) 2025-02-14
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JP2019002778A (ja) 2019-01-10
JP6787260B2 (ja) 2020-11-18
CN110753828B (zh) 2022-06-14
CN114754802A (zh) 2022-07-15
DE112018003016T5 (de) 2020-03-05

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