WO2018230244A1 - 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
WO2018230244A1
WO2018230244A1 PCT/JP2018/019061 JP2018019061W WO2018230244A1 WO 2018230244 A1 WO2018230244 A1 WO 2018230244A1 JP 2018019061 W JP2018019061 W JP 2018019061W WO 2018230244 A1 WO2018230244 A1 WO 2018230244A1
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WO
WIPO (PCT)
Prior art keywords
detection
detection target
position sensor
signals
ranges
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/JP2018/019061
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English (en)
French (fr)
Japanese (ja)
Inventor
靖寛 北浦
篤史 小林
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 DE112018003012.1T priority Critical patent/DE112018003012B4/de
Priority to CN201880038378.7A priority patent/CN110741231B/zh
Publication of WO2018230244A1 publication Critical patent/WO2018230244A1/ja
Priority to US16/697,806 priority patent/US11099034B2/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
    • G01D5/244—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
    • G01D5/249—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 pulse code
    • G01D5/2497—Absolute encoders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—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
    • 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
    • G01D5/244—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
    • G01D5/24428—Error prevention
    • G01D5/24433—Error prevention by mechanical means
    • G01D5/24438—Special design of the sensing element or scale
    • 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

Definitions

  • This disclosure relates to a position sensor that outputs a signal corresponding to a position to be detected.
  • Patent Document 1 has proposed a detection apparatus including a sensor unit capable of sensing the proximity of a detection target.
  • the sensor unit is configured to output a signal of a predetermined level when the detection target is in proximity.
  • the detection target when the amount of movement of the detection target increases, the detection target may deviate from the detectable range of the sensor unit. In other words, there is a limit to the range in which the sensor unit can detect the detection target.
  • This disclosure is intended to provide a position sensor that can detect the movement of a detection target by one detection unit even if the amount of movement of the detection target increases.
  • the position sensor includes a magnet that generates a bias magnetic field and a detection element to which the bias magnetic field is applied, and the detection element is moved along with the movement of the detection target made of a magnetic material.
  • a detection unit that generates a plurality of detection signals corresponding to a plurality of ranges arranged in one direction along the moving direction of the detection target and having different phase differences based on a change in the magnetic field received from the detection target.
  • 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 target has a plurality of area portions corresponding to a plurality of ranges. Further, the plurality of region portions are configured to be connected in a stepped manner in the moving direction of the detection target within the detection surface of the detection target facing the detection portion.
  • the sensors are arranged in one direction along the moving direction of the detection target based on the change of the magnetic field received from the detection target with the movement of the detection target including the magnet.
  • the position sensor is different from the position sensor according to the first aspect of the present disclosure in that it includes a detection unit that generates a plurality of detection signals corresponding to a plurality of ranges and having different phase differences.
  • the detection unit can generate a detection signal based on a change in the magnetic field received from the end region when detecting the position of the end region.
  • the detection target since the detection target has a configuration corresponding to the detectable range of the detection unit, even if the movement amount of the detection target increases, the movement of the detection target can be detected by one detection unit. .
  • 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 a relative positional relationship between each detection target region and the detection unit.
  • FIG. 11 is a diagram showing detection signals, state determinations, and position signals when detecting four states.
  • FIG. 12 shows a comparative example.
  • FIG. 13 is a diagram showing a case where three states are determined as a modified example.
  • FIG. 14 is a diagram showing a case where three states are determined as a modification,
  • FIG. 15 is a diagram showing a case where four states of a detection target in which each region portion is configured as a space portion are determined as a modification, FIG.
  • FIG. 16 is a diagram showing an example in which a transition portion is provided between each region portion as a modification.
  • FIG. 17 is a diagram showing an example in which the chip surface of the sensor chip is inclined with respect to the moving direction of the detection target as a modification example.
  • FIG. 18 is a diagram showing an example of the detection target of the concavo-convex shape as a modification
  • FIG. 19 is a diagram showing an example of a fan-shaped detection target as a modification
  • FIG. 20 is a diagram showing an example of a fan-shaped detection target as a modification
  • FIG. 21 is a diagram showing an example of a detection object of a rotating body as a modification
  • FIG. 22 is a diagram showing each region provided in the rotating body of FIG. FIG.
  • FIG. 23 is a diagram showing discrete pulse widths in the case of determining four states in the second embodiment.
  • FIG. 24 is a plan view showing components constituting a magnetic detection method using the magnetoresistive element according to the third embodiment.
  • 25 is a cross-sectional view taken along the line XXV-XXV in FIG.
  • FIG. 26 is a plan view showing components constituting the magnetic detection method using the Hall element according to the third embodiment.
  • 27 is a sectional view taken along line XXVII-XXVII in FIG.
  • FIG. 28 is a diagram showing a detection signal when the detection target is a magnet
  • FIG. 29 is a diagram showing detection signals, state determinations, and position signals when detecting the four states of the magnet.
  • FIG. 30 is a diagram showing an example of a detection target in which a magnet is attached to a plate member as a modification
  • FIG. 31 is a diagram showing an example in which a detection target composed of a plate member and a rubber magnet is magnetized as a modification
  • FIG. 32 is a diagram showing an example in which a magnet is provided on a fan-shaped detection target as a modification
  • FIG. 33 is a diagram showing an example in which a magnet is provided on a detection target of a rotating body as a modification
  • FIG. 34 is a view showing each region provided in the rotating body of FIG.
  • 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 a movable part that is linked to the operation of the shift position of the vehicle as a detection target. Specifically, the position sensor 100 acquires the state of the shaft by detecting a signal corresponding to the position of the shaft.
  • the shaft state means the position of the shaft when the shift position is operated by the user. For example, the shaft moves in conjunction with parking at the shift position. When the shift position is operated so as to be positioned at the parking, the shaft moves in the axial direction. As a result, the shaft reflects the parking state.
  • the position sensor 100 detects a position corresponding to parking on the shaft.
  • the shaft when the shift position is operated so as to be located at a position other than parking, the shaft reflects a state other than parking.
  • the position sensor 100 detects a position other than the position corresponding to parking on the shaft.
  • the shaft may move in conjunction with a position other than parking.
  • the shaft is entirely made of a magnetic material, for example.
  • the surface of the shaft facing the position sensor 100 may be formed of a magnetic material, and the other part may be 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 shaft-side tip 102, a flange 103 fixed to the peripheral mechanism, and a connector 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 detection surface of the shaft. Therefore, the shaft moves with respect to the position sensor 100.
  • the position sensor 100 may be fixed to the peripheral mechanism so as to detect the position of the valve that operates in conjunction with the shaft. Further, the moving direction of the shaft is not limited to linear movement or reciprocation, but may be rotation, reciprocation within a specific angle, or the like. As described above, 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 generates a bias magnetic field and 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 detection target 200.
  • the detection signal becomes maximum at the center of the movement direction of the detection target 200.
  • the gap increases, the amplitude of the detection signal decreases, and when the gap decreases, the amplitude of the detection signal increases.
  • FIG. 5 shows only the relationship between the movement of the detection target 200 and the detection signal from the magnetic detection element.
  • 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 200.
  • the leads 113 to 115 are arranged so as to be perpendicular to the moving direction of the detection target 200.
  • 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 detection target 200 moves with respect to the holding unit 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. The position of the detection target 200 can be detected by setting a threshold value for each detection signal.
  • 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 includes a magnet 106 and a detection element 124 provided on the sensor chip 110.
  • the signal processing unit 123 is provided in the processing circuit chip 109. The detection element 124 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 has a plurality of detection signals corresponding to a plurality of ranges along the moving direction of the detection target 200 and having different phase differences based on a change in the magnetic field received from the detection target 200 as the detection target 200 moves. Is generated.
  • the plurality of ranges along the movement direction of the detection target 200 are not arranged in parallel along the movement direction of the detection target 200, but a plurality of ranges are aligned along the movement direction of the detection target 200. Lined up in series in the direction.
  • the detection target 200 has four area portions 201 to 204 corresponding to a plurality of ranges A to D.
  • Each of the area portions 201 to 204 is composed of a rectangular plate member.
  • each of the area portions 201 to 204 is configured to be connected in a staircase pattern in the moving direction of the detection target 200 within the detection surface 205 of the detection target 200 facing the detection unit 122.
  • “To be connected in a staircase pattern” means that one region 201 and the other region 202 are connected to each other while being shifted in the direction perpendicular to the moving direction in the plane of the detection surface 205. Similarly, one area portion 202 and the other area portion 203 are connected within the detection surface 205 while being shifted in the direction perpendicular to the moving direction. The same applies to one region 203 and the other region 204. Thus, in each of the region portions 201 to 204, both end portions along the moving direction, that is, the two long side portions form a stepped shape.
  • the area part 202 is connected in series in one direction next to the area part 201, and the area part 203 is connected in series in one direction on the opposite side of the area part 202 to which the area part 201 is connected. ing. Similarly, a region portion 204 is connected to the region portion 203 in series in one direction on the side opposite to the side where the region portion 202 is connected.
  • the chip surface of the sensor chip 110 on which the detection element 124 is provided is oriented in a direction perpendicular to the moving direction of the detection unit 122.
  • each of the area units 201 to 204 moves in a direction perpendicular to the movement direction within the plane of the detection surface 205 with respect to the detection unit 122.
  • the positional relationship between the detection unit 122 and each of the region units 201 to 204 is changed by the movement of the detection target 200.
  • FIG. 10 the positional relationship between each of the area units 201 to 204 and the detection unit 122 is shown by arranging the detection unit 122 for each of the area units 201 to 204.
  • the detection target 200 is formed by pressing a plate member made of a magnetic material.
  • the area portions 201 to 204 may have the same or different length in the moving direction.
  • each of the area portions 201 to 204 may have the same or different length in the direction perpendicular to the moving direction within the detection surface 205.
  • the detection target 200 is fixed to a component such as a shaft.
  • region parts 201 and 204 of both ends may be fixed to the shaft.
  • the detection element 124 of FIG. 9 has three element pairs, a first magnetoresistive element pair, a second magnetoresistive element pair, and a third magnetoresistive element pair, whose resistance values change as the detection target 200 moves. ing.
  • each of the second magnetoresistive element pairs is disposed between the first magnetoresistive element pair and the third magnetoresistive element pair in the moving direction of the detection target 200. That is, the second magnetoresistive element pair is disposed so as to be sandwiched between the first magnetoresistive element pair and the third magnetoresistive element pair.
  • a bias magnetic field along the central axis of the magnet 106 is applied to the second magnetoresistive element pair.
  • a bias magnetic field for winding the end of the magnet 106 is applied to the first magnetoresistive element pair and the third magnetoresistive element pair.
  • Each magnetoresistive element pair is configured as a half bridge circuit in which two magnetoresistive elements are connected in series between a power source and a ground. Each magnetoresistive element pair detects a change in resistance value when the two magnetoresistive elements are affected by the magnetic field as the detection target 200 moves. Each magnetoresistive element pair outputs a voltage at the midpoint between the two magnetoresistive elements as a waveform signal based on the change in the resistance value. In a configuration in which each magnetoresistive element pair is driven by a current source, the voltage across each magnetoresistive element pair becomes a waveform signal.
  • the detection unit 122 includes first to fourth operational amplifiers (not shown) in addition to the magnetoresistive element pairs.
  • the first operational amplifier calculates V1-V2.
  • the differential amplifier is configured to output the result as R1. If the midpoint potential of the midpoint of the third magnetoresistive element pair is defined as V3, the second operational amplifier is a differential amplifier configured to calculate V2-V3 and output the result as R2. .
  • the fourth operational amplifier inputs the midpoint potential V1 from the midpoint of the first magnetoresistive element pair and also inputs the midpoint potential V3 from the midpoint of the third magnetoresistive element pair to calculate V1-V3 and calculate A differential amplifier configured to output the result as S2.
  • the signal S2 is a signal having a waveform 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 acquires each detection signal from the detection unit 122, compares each detection signal with a threshold, and based on a combination of magnitude relationships between each detection signal and the threshold, a plurality of ranges in the detection target 200 are obtained.
  • the position of the detection target 200 is specified as the position of any range.
  • the signal processing unit 123 outputs the position of the detection target 200 to the controller 300.
  • the signal processing unit 123 includes a processing unit 125 and an output circuit unit 126.
  • the processing unit 125 inputs each detection signal from the detection unit 122 and specifies the position of the detection target 200 based on each detection signal. For this reason, the processing unit 125 has a common threshold for each detection signal.
  • the processing unit 125 compares the signals S1 and S2, which are detection signals, with a threshold value. The processing unit 125 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. Further, the processing unit 125 determines which range of the detection target 200 the detection unit 122 has detected from the Hi / Lo combination of the signals S1 and S2.
  • the detection unit 122 when the signal S ⁇ b> 1 is Hi and the signal S ⁇ b> 2 is Lo, the detection unit 122 has detected the range of the region portion 201 in the detection target 200. That is, the processing unit 125 has specified the position of the shaft that is the detection target 200. The state of the shaft when the position of the range is specified is “state A”.
  • the detection unit 122 When the signal S1 is Hi and the signal S2 is Hi, the detection unit 122 has detected a range in the region 202 of the detection target 200.
  • the state of the shaft when the position of the range is specified is “state B”.
  • the detection unit 122 When the signal S1 is Lo and the signal S2 is Hi, the detection unit 122 has detected the range of the region part 203 of the detection target 200.
  • the state of the shaft when the position of the range is specified is “state C”.
  • the detection unit 122 has detected the range of the region part 204 in the detection target 200.
  • the state of the shaft when the position of the range is specified is “state D”.
  • the processing unit 125 identifies the position of the detection target 200 as the position of any one of a plurality of ranges along the moving direction of the detection target 200.
  • the output circuit unit 126 is a circuit unit that outputs a position signal indicating one of the states A to D to the controller 300 based on the determination result of the processing unit 125. First, the output circuit unit 126 acquires information on the states A to D determined based on the detection signal from the processing unit 125. Further, the output circuit unit 126 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.
  • state A is V H
  • state B is V M1
  • state C is V M2
  • state D is V L
  • 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 D, 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.
  • the detection unit 122 detects two edges in the movement direction of the detection target 500 and determines the movement direction center, if the detection target 500 is long and the distance between the edges is too far away, the movement direction center is not known.
  • the area portions 201 to 204 that are portions detected by the detection unit 122 are provided within the range of the detection target 200 in the moving direction. Accordingly, as shown in FIG. 11, the signals S1 and S2 do not converge to the threshold value, and are clearly Hi or Lo with respect to the threshold value. Of course, by setting the boundary between the central region 202 and the region 203 as the center of the detection target 200, it is possible to detect the center of the detection target 200 in the moving direction.
  • the detection target 200 moves, the relative relationship between the detection target 200 and the detection unit 122 is maintained. That is, the areas 201 and 204 indicating the position of the detection target 200 are also provided in a range located at the end of the plurality of ranges. For this reason, the detection signal based on the change of the magnetic field received from the area units 201 and 204 by the detection unit 122 can be generated.
  • the detectable range of the detection unit 122 is substantially wider than that of the comparative example, even if the amount of movement of the detection target 200 increases, the movement of the detection target 200 is detected by one detection unit 122. can do.
  • by classifying the detection target 200 by the shape divided by the number of positions to be discriminated it is possible to determine each segment and output corresponding to the segment.
  • the detection target 200 can be composed of three area portions 201 to 203.
  • the signal processing unit 123 sets “state A” when the signal S3 is Hi and the signal S4 is Lo, sets “state B” when the signal S4 is Hi, and sets the case where the signal S3 is Lo and the signal S4 is Lo as “ It is determined as “state C”.
  • the three states may be set to three discrete voltage values.
  • signals S5 and S6 having a phase difference different from the signals S3 and S4 shown in FIG. 13 can be generated as detection signals.
  • Each signal S5, S6 can be generated by changing an arithmetic expression using the output of each magnetoresistive element pair.
  • the central region 202 may be formed shorter than the region 202 shown in FIG. 13 in the movement direction.
  • the number of detectable states can be freely changed by appropriately changing the number of the area portions 201 to 204 and a plurality of detection signals having different phase differences. Therefore, the detection is not limited to the detection of three states or four states, and the number of states such as five states or seven states can be detected.
  • each of the area portions 201 to 204 of the detection target 200 may be configured as a space portion in which a part of the plate member is punched out.
  • the signals S7 and S8 having a phase difference are signals obtained by inverting the signals S1 and S2 shown in FIG.
  • the signal processing unit 123 sets “state A” when the signal S7 is Lo and the signal S8 is Hi, sets “state B” when the signal S7 is Lo and the signal S8 is Lo, the signal S7 is Hi, The case where S8 is Lo is determined as “state C”, and the case where the signal S7 is Hi and the signal S8 is Hi is determined as “state D”.
  • the position detected by the detection unit 122 may be configured as a space portion configured in a window shape instead of the material portion of the detection target 200.
  • a transition unit 206 may be provided between the region unit 201 and the region unit 202 and between the region unit 202 and the region unit 203. Regardless of the number of the area parts 201 to 204, the transition part 206 can be provided between adjacent areas.
  • the shape of the transition part 206 is not limited to a linear shape or an R shape.
  • the transition unit 206 can also be applied when each of the area units 201 to 204 is configured as a space portion.
  • the chip surface of the sensor chip 110 on which the detection element 124 is provided may be inclined instead of the direction perpendicular to the moving direction of the detection unit 122.
  • the transition unit 206 is provided in the detection target 200, but the transition unit 206 may not be provided in the detection target 200.
  • each of the area portions 201 to 204 may be configured as an uneven shape in which a block is provided on a plate member.
  • the detection target 200 may be one in which a part of a fan-shaped plate member is punched out.
  • the step-like region portions 201 to 204 shown in FIG. 10 can be provided in the fan-shaped circumferential direction. Thereby, the position of each of the ranges A to D can be detected by rotating or rotating the detection target 200 around the axis.
  • the detection target 200 may be configured as a rotating body such as a rotor, as shown in FIG.
  • the area portions 201 to 204 corresponding to the detection range are provided in the broken line portion in FIG.
  • four region portions 201 to 204 are provided in the ⁇ direction of the rotation angle.
  • the detection unit 122 can detect the rotation or rotation state of the detection target 200.
  • controller 300 of this embodiment corresponds to an external device.
  • the output circuit unit 126 outputs pulse signals having different pulse widths to the controller 300 as discrete value signals. 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. Similar to the first embodiment, it is possible to improve resistance to noise.
  • 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 D is set to be the largest.
  • the pulse width of the signal corresponding to states B and C is set between the pulse widths of the signals corresponding to states A and D.
  • the pulse width may change stepwise from state A to state D, or may be random.
  • the whole or a part of the detection target 200 is configured by a magnet, and the position sensor 100 is not provided with the magnets 106 and 120.
  • the magnet 106 is not provided in the magnetic detection system using the magnetoresistive element.
  • the magnet 120 is not provided in the magnetic detection system using the Hall element. Therefore, the mold IC unit 105 is directly inserted into the holding unit 107 and fixed.
  • the detection target 200 is configured as a magnet 207 having a magnetization direction on the sensor chip 110 side with respect to the movement direction.
  • the detection unit 122 provided in the sensor chip 110 uses the signal processing unit 123 to detect the signal S9 that is maximum or minimum at the center of the magnetic pole and the signal S10 that is maximum or minimum at the boundary of each magnetic pole as detection signals. Output to.
  • the signals S9 and S10 are signals having a phase difference.
  • the detection unit 122 may be configured such that the signal S9 is maximum or minimum at the boundary of each magnetic pole and the signal S10 is maximum or minimum at the center of the magnetic pole. Further, the number of poles of the magnetic poles constituting one region portion 201 to 204 is not limited to three, but may be other pole numbers.
  • each of the area portions 201 to 204 of the detection target 200 is configured such that the N pole of the magnet 207 is sandwiched between two S poles. Thereby, the magnetization direction of the magnet 207 becomes the direction perpendicular to the paper surface.
  • the state determination is the same as in the case of FIG. 11 of the first embodiment.
  • the detection target 200 may be one in which magnets 207 constituting the respective region portions 201 to 204 are attached on a plate member.
  • the magnetization direction is a direction perpendicular to the plate surface of the plate member.
  • the detection target 200 may be magnetized so that a part of the rubber magnet 209 provided on the magnetic plate member 208 becomes the magnet 207.
  • the magnetization direction is a direction perpendicular to the plate surface of the rubber magnet 209.
  • the detection target 200 may be one in which a magnet 207 is pasted or magnetized on a fan-shaped plate member.
  • the detection target 200 may be provided with a magnet 207 on a rotating body such as a rotor.
  • magnets 207 constituting the four region portions 201 to 204 are provided in the broken line portion of FIG. 33 in the ⁇ direction of the rotation angle.
  • the configuration of the magnet 207 may be the same as the configuration shown in FIG. 31, or may be a configuration in which the magnet 207 is attached to the plate member.
  • the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures.
  • the present disclosure includes various modifications and modifications within the equivalent range.
  • various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.
  • 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.
  • the detection target 200 does not include the magnet 207, but the configuration in which the position sensor 100 includes the magnets 106 and 120, and the detection target 200 includes the magnet 207, the position sensor 100 includes A configuration in which the magnets 106 and 120 are not included is shown, but these combinations are examples. Accordingly, the detection target 200 may include the magnet 207, and the position sensor 100 may include the magnets 106 and 120. In this case, the operation of the position sensor 100 is the same as in the first embodiment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
PCT/JP2018/019061 2017-06-16 2018-05-17 ポジションセンサ Ceased WO2018230244A1 (ja)

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CN201880038378.7A CN110741231B (zh) 2017-06-16 2018-05-17 位置传感器
US16/697,806 US11099034B2 (en) 2017-06-16 2019-11-27 Position sensor

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US20200096367A1 (en) 2020-03-26
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CN110741231B (zh) 2022-04-01
JP2019002835A (ja) 2019-01-10

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