WO1998033041A1 - Detecteur de deplacement magnetique et detecteur d'ouverture de carburateur - Google Patents
Detecteur de deplacement magnetique et detecteur d'ouverture de carburateur Download PDFInfo
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- WO1998033041A1 WO1998033041A1 PCT/JP1998/000318 JP9800318W WO9833041A1 WO 1998033041 A1 WO1998033041 A1 WO 1998033041A1 JP 9800318 W JP9800318 W JP 9800318W WO 9833041 A1 WO9833041 A1 WO 9833041A1
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- Prior art keywords
- magnetic
- magnetic field
- generating means
- detecting
- relative movement
- Prior art date
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Classifications
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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
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2033—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
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- 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
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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
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/22—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils
- G01D5/2208—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the self-induction of the coils
- G01D5/2241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature differentially influencing two coils by influencing the self-induction of the coils by controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
Definitions
- the present invention is used for detecting an absolute displacement amount between two members that move relatively, for example, in a machine tool or a precision measuring device.
- the present invention relates to a magnetic displacement detection device that can be used and an opening detection device for a carburetor that detects the opening of a throttle valve of a carburetor using the magnetic displacement detection device.
- a binary code (binary code or gray code) of a predetermined digit is marked at each position in the relative movement direction on the scale, and the absolute position is read by reading this code.
- a method in which multiple scales with different wavelengths are juxtaposed along the direction of relative movement and an absolute value signal is generated by detecting the phase difference between these scales (Vernier method). is there.
- Figure 1 shows a 4-digit gray code (white background is logical, 0,.
- An example of marking this gray code using Head 2 that has a detector corresponding to each digit is marked on the scale 1 (the shaded area corresponds to logic '1,').
- this is achieved by arranging the two coils 3 and 4 on the same straight line along the direction of relative movement, and attaching the core 5 made of a high magnetic permeability material to the coils 3 and 4. It is inserted relatively movably inside, and based on the fact that the inductance of coils 3 and 4 changes according to the movement of core 5, the absolute output with high linearity is obtained by taking the differential output of coils 3 and 4. This is to detect the amount.
- this is caused by applying a current to the resistance wire 7 extending along the relative movement direction and bringing the contact 8 into contact with the resistance wire 7 so as to be relatively movable.
- the absolute displacement is detected by a change in the voltage Vo between the contact 8 and the end ⁇ a of the resistance wire ⁇ .
- a coil 11 is fixedly attached to one end 10a of a metal wire 10 extending along the relative movement direction, and a detection coil 12 is connected to a metal wire 10a. Mount so that it can move relative to.
- the magnetism of the metal causes magnetostriction in the metal wire 10, and the magnetostrictive pulse flows from the end 10a to the other end 10b. Since 0 propagates at the speed of sound (the speed of sound in a metal depends on the material of the metal), the detection coil 12 is also induced by magnetostriction. From the input time of the pulse current, the detection The delay time up to the time when the rule 12 is induced is measured, and the absolute displacement is calculated based on the delay time.
- the length of the coils 3 and 4 for improving the absolute moving direction must each be longer than the effective length (the amount of detectable absolute displacement). Since the length of the pad 6 for moving the core 5 is also required to be longer than the effective length, the total length of the detection device is three times or more the effective length. Therefore, the other invalid length part becomes longer than the effective length, and the device becomes larger.
- the propagation speed of magnetostriction is sound speed, and that the next measurement must be performed until the reflected wave of the magnetostrictive pulse is attenuated by the pulse attenuator 13, the time required for detection is considerably long. (That is, the response speed is slow).
- the coil 11 is required for the invalid length part.However, since a coil drive and a circuit for time measurement are required, the number of circuit points increases and the circuit configuration becomes complicated. Therefore, it is still difficult to reduce the size and cost of the device.
- the ignition timing of the engine has been controlled in order to improve the output and fuel efficiency of the engine and purify the exhaust gas.
- the load state of the engine is detected based on the number of revolutions of the engine divided by the degree of throttle valve control, and control is performed so that the ignition timing of the engine is optimized.
- the carburetor is provided with a potentiometer that converts the amount of movement of the throttle valve into a rotation amount.
- the opening of the throttle valve is detected from the amount, and the ignition timing of the engine is controlled.
- FIGS. 5 and 6 show a carburetor to which the conventional throttle valve opening detection device described in Japanese Patent Application Laid-Open No. Hei 7-3177151 is applied. Will be explained.
- FIG. 5 is a side view of the conventional vaporizer
- FIG. 6 is a cross-sectional view taken along the line ZZ ′ of FIG.
- the conventional carburetor 21 has a main body 22 and fuel A chamber 23 connected to the passage 34 and into which liquid fuel is injected is provided.
- the main body 22 includes a cap body 24, a bistone valve 25 inserted into a valve chamber 32 formed in the cap body 24, and opening and closing a bench lily passage 31 formed in the cap body 24.
- a lid 26 attached to the upper opening of the cabin body 24 so as to close the valve chamber 32, and a bias valve 25 provided between the lid 26 and the piston valve 25 is urged.
- Panel 27 is provided.
- the cap body 24 is made of, for example, zinc die-cast, and has a venturi passage 31 through which intake air flows in the direction a shown in FIG.
- the cap body 24 is provided with a cylinder portion 33 extending vertically upward from the venturi passage 31 and opening the vent lily passage 31 to form a valve chamber 32 into which the biston valve 25 is inserted.
- a jet needle 36 which extends vertically downward from the bench lily passage 31 so as to be coaxial with the cylinder portion 33 and is provided in the biston valve 25, is inserted into the cap body 24.
- a fuel introduction passage 34 is formed. Further, the cap body 24 is provided with a fuel introduction portion 35 that is integrated with the fuel introduction passage 34 and extends into the chamber 23.
- a substantially oval bottomed cylindrical biston valve 25 is inserted into the valve chamber 32 formed in the cylinder portion 33 in a direction perpendicular to the direction of the intake air flowing through the venturi passage 31. Is done.
- the biston valve 25 is slidable with respect to the cylinder portion 33, and is held by the cylinder portion 33 so that the moving shaft does not shift.
- the piston valve 25 moves up and down in the valve chamber 32, The passage area of the venturi passage 31 is changed, and the amount of intake air flowing through the venturi passage 31 is adjusted.
- a bottomed cylindrical lid 26 having a shape corresponding to the cylinder part 33 is attached, and the valve chamber 32 formed in the cylinder part 33 is closed. I have.
- a spring 27 is provided between the lid 26 and the piston valve 25. The spring 27 urges the piston valve 25 in a direction to close the bench lily passage 31.
- an engagement portion 33a for restricting the movement of the biston valve 25 in the closing direction is formed at an upper end opening of the cylinder portion 33, and the engagement portion 33a is formed so as to correspond to the engagement portion 33a.
- a flange 25 a is formed at the upper end opening of the bistone valve 25.
- a jet needle 36 is provided outside the bottom surface of the piston valve 25.
- the jet needle 36 is inserted into a fuel introduction passage 34 formed vertically downward with respect to the Venturi passage 31, and moves up and down with the biston valve 25.
- Such a jet dollar 36 adjusts the amount of fuel sucked into the bench lily passage 31 from the chamber 23.
- Conventional carburetor 21 with such a configuration is applied to, for example, motorcycles
- one end of a throttle cable (not shown) is locked to the bottom of the above-mentioned biston valve 25, and an extended end of the throttle cable is connected to the excel grip.
- the operation of the accelerator grip causes the piston valve 25 to move up and down, thereby changing the passage area of the venturi passage 31 from fully closed to fully open, and the bench lily passage. 3 Adjust the amount of fuel sucked into 1.
- fuel can be mixed with intake air and supplied to the engine, and the rotation speed of the engine can be changed.
- the venturi passage 31 was not completely closed even when the biston valve 25 was in the idling state, so that the bench lily passage 3 was removed from the chamber 23. A predetermined amount of fuel is sucked into 1. Therefore, in the carburetor 21, the intake air in which a predetermined amount of fuel is mixed can be supplied to the engine when the piston valve 25 is in the idling opening degree.
- the conventional vaporizer 21 is provided with an opening detection unit that detects the opening of the piston valve 25.
- This opening detection unit is provided with a permanent magnet 41 provided on the lower edge of the piston valve 25 and an outer surface of a partition wall of the cylinder unit 33, and includes first to third magnetic sensors 43 to 45. And a detection unit 42 provided.
- the permanent magnet 41 is disposed at the lower edge of the biston valve 25 in a direction perpendicular to the direction a of the intake air flowing into the venturi passage 31. The permanent magnet 41 moves with the movement of the piston valve 25 in parallel with the center axis of the piston valve 25.
- the detection unit 42 is in contact with the outer surface of the partition wall of the cylinder section 33. I have. Inside the detection unit 42, first to third magnetic sensors 43 to 45 are provided. The first to third magnetic sensors 43 to 45 are positioned with a permanent magnet 41 provided on the biston valve 25 and a partition wall of the cylinder part 33 interposed therebetween. The first to third magnetic sensors 43 to 45 are arranged in a line parallel to the axial direction of the biston valve 25 so that the permanent magnets 41 oppose each other when the permanent magnet 41 moves up and down with the piston valve 25. Are located in Specifically, the opening of the piston valve 25 is in the most closed state, ie, the first opening slightly opened from the idling degree, the second opening further opened, and the third opening. In this case, the first to third magnetic sensors 43 to 45 are provided so as to face the permanent magnets 41 in the event that the temperature becomes too high.
- the magnetic sensors corresponding to the first opening, the second opening, and the third opening respectively correspond to the permanent magnet 41.
- the magnetic field of is detected. For example, when the permanent magnet 41 is near the first degree, the first magnetic sensor 43 is turned on. When the permanent magnet 41 is near the second degree, the second magnetic sensor 44 is turned on. It turns on, and when it is near the third degree, the third magnetic sensor 45 turns on.
- the opening of the piston valve 25 is reduced to 3 degrees. Detection can be performed in stages, and by supplying this detection output to a control circuit or the like, for example, engine ignition timing can be controlled.
- the present invention has been made in view of the actual situation of the conventional magnetic displacement detection device as described above, and eliminates the inconvenience of each of the conventional methods, has a simple circuit configuration, and is small in size and low in cost. It is an object of the present invention to provide a magnetic type absolute displacement detection device which can be easily implemented and can make the effective length longer than the ineffective length.
- an object of the present invention is to provide a magnetic displacement detection device capable of detecting an absolute displacement amount with high accuracy.
- Another object of the present invention is to provide a magnetic displacement detection that can increase the effective length and effectively utilize a limited space by making the effective length longer than the ineffective length. It is to provide a device.
- Another object of the present invention is to provide a magnetic displacement detection device that has high durability and can be applied to a machine or the like that violently vibrates.
- Another object of the present invention is to provide a magnetic displacement detection device having a high response speed.
- Still another object of the present invention is to provide a magnetic displacement detection device capable of detecting the absolute displacement amount with high accuracy by improving the linearity of the sensor output.
- the present invention has been made in view of the above-described state of the art carburetor opening detection apparatus, and has been described in detail. It is an object of the present invention to provide a vaporizer opening detection device capable of performing detection with a simple configuration.
- the magnetic displacement detection device includes: a magnetic field detection unit including an impedance change type magnetic sensor having two magnetic sensing units whose impedance changes according to the strength of an external magnetic field; A detected portion having a magnetic field generating means for generating a magnetic field that continuously changes along the direction of relative movement of the magnetic sensor; an oscillation circuit for exciting and driving the magnetic sensor; and the magnetic field generating means.
- the above magnetic field depending on the strength of the external magnetic field
- a detection circuit for extracting an output signal obtained by converting a change in impedance of the air sensor into an electric signal, and detecting an absolute displacement amount between the magnetic field detection unit and the detected portion based on the output signal.
- the two magnetic sensing units are arranged apart from each other along a direction of relative movement with the detection target;
- the detection circuit section differentially detects the impedance change of the two magnetic sensing sections and extracts an output signal.
- the two magnetic sensing sections are arranged at the same position in a relative movement direction with respect to the detected section, and the two magnetic sensing sections in the detecting circuit section.
- the output signal is extracted by differentially detecting the impedance change of the section.
- the direction of magnetization of the magnetic field generating means is parallel to the direction of magnetic sensing of the magnetic field detection unit.
- the two magnetic sensing units are arranged at the same position in a direction orthogonal to a direction of relative movement with the detection unit.
- the magnetic field detection unit is, for example, an impedance change type magnetic sensor including two coils wound around a core made of a high magnetic permeability material as the two magnetic sensing units.
- the magnetic field detection unit is, for example, an impedance change type magnetic sensor including two amorphous magnetic wires as the two magnetic sensing units.
- two magnetic field generating means sandwich the magnetic sensor along a direction of relative movement with the magnetic field detecting part in a state where the magnetization directions are opposite to each other. At a distance from each other.
- the two magnetic field generating means are arranged, for example, with the direction of magnetization parallel to the direction of relative movement with respect to the magnetic field detection unit.
- the two magnetic field generating means are arranged, for example, so that the direction of magnetization is orthogonal to the direction of relative movement with respect to the magnetic field detection unit.
- the two magnetic field generating means are magnetically connected by, for example, a high magnetic permeability material.
- the magnetic field generating means of the detected portion includes, for example, two magnetic poles which are close to each other and whose polar faces are opposite to each other, and have a length equal to or longer than the effective length for detecting the absolute displacement amount.
- the boundary between the two magnetic poles of the magnetic field generating means is inclined by a predetermined angle from the direction of relative movement with the magnetic field detection unit, and the length of the magnetic field generating means in the direction of relative movement is The magnetic field detecting section and the above-described detected section are relatively moved with the effective length or longer.
- the present invention relates to a carburetor having a vent body passage, a valve body having a valve chamber formed to open to the passage, and a variable area valve slidably disposed in the valve chamber to change a bench lily passage area.
- a magnetic field generating means for generating a continuously changing magnetic field over the moving range of the variable area valve, and two magnetic sensing parts whose impedance is changed by the strength of the external magnetic field.
- a magnetic field detecting means comprising an impedance change type magnetic sensor; an oscillation circuit for exciting and driving the magnetic sensor; and an impedance of the magnetic sensor according to the strength of an external magnetic field provided by the magnetic field generating means.
- the magnetic field generating means may include, for example, two magnetic field generating units whose magnetization directions are perpendicular to the sliding direction of the variable area valve.
- the two magnetic field generators are provided with opposite polarities of the magnetic pole faces and separated from each other by a distance equal to or greater than the moving range of the variable area valve.
- the magnetic field generating means has, for example, two magnetic pole surfaces which are magnetized in opposite polarities with a boundary intersecting the relative movement locus of the magnetic field detecting means.
- FIG. 1 is a diagram showing an example of a conventional absolute displacement detection method.
- FIG. 2 is a diagram showing another example of a conventional absolute displacement detection method.
- FIG. 3 is a diagram showing another example of a conventional absolute displacement detection method.
- FIG. 4 is a diagram showing another example of a conventional absolute displacement detection method.
- FIG. 5 is a side view of a conventional opening detector for a carburetor.
- FIG. 6 is a cross-sectional view of the conventional vaporizer opening detection device.
- FIG. 7 is a front view showing one embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 8 is a front view showing an example of the configuration of a magnetic sensor used in the magnetic displacement detection device.
- FIGS. 9A and 9B are diagrams showing an example of a configuration of a permanent magnet used as an external magnetic field generating means in the magnetic displacement detection device, FIG. 9A is a front view, and FIG. 9B is a side view.
- FIG. 10 is a circuit diagram showing an example of a configuration of an oscillation circuit unit and a detection circuit unit used in the magnetic displacement detection device.
- FIG. 11 is a diagram showing an example of a displacement-output characteristic in the magnetic displacement detection device.
- FIG. 12 is a diagram showing an example of the relationship between the strength of the magnetic field and the impedance of the coil.
- FIG. 13 is a front view showing another example of the configuration of the magnetic sensor.
- FIG. 14 is a front view showing another example of the configuration of the magnetic sensor.
- FIG. 15 is a front view showing a modification of the magnetic displacement detection device shown in FIG.
- FIG. 16 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 17 is a diagram showing an example of the relationship between the distance from the magnetic field generating means and the output of each coil.
- FIGS. 18A and 18B are diagrams showing a modification of the magnetic displacement detection device shown in FIG. 16, in which FIG. 18A is a front view and FIG. 18B is a plan view.
- FIG. 19A and FIG. 19B are diagrams showing another example of the configuration of the permanent magnet used as the external magnetic field generating means in the magnetic displacement detection device according to the present invention, and FIG. Figure and Figure 19B are side views.
- FIG. 20 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 21 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIGS. 22A and 22B are diagrams showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 22A is a perspective view
- FIG. 22B is a front view.
- FIGS. 23A and 23B are diagrams showing another example of the configuration of the magnetic sensor.
- FIG. 23A is a sectional view
- FIG. 23B is a plan view.
- FIG. 24A and 24B are diagrams showing another example of the configuration of the permanent magnet.
- FIG. 24A is a front view
- FIG. 24B is a side view.
- FIG. 25 is a perspective view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 26 is a perspective view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 27 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 28 is a diagram showing an example of a displacement-output characteristic in the magnetic displacement detection device shown in FIG.
- FIG. 29 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 30 is a front view showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIGS. 31A and 31B are diagrams showing another embodiment of the magnetic displacement detection device according to the present invention.
- FIG. 31A is a perspective view
- FIG. 31B is a front view.
- FIG. 32 is a front view showing a modified example of the coil arrangement in the magnetic sensor used in the magnetic displacement detection device according to the present invention.
- FIGS. 33A and 33B show the magnetic displacement detection device according to the present invention.
- FIG. 3A is a diagram showing an example of a configuration of a magnet used as an external magnetic field generating means of a detected part in the present embodiment.
- FIG. 33A is a front view
- FIG. 33B is a side view.
- FIGS. 34A and 34B are diagrams showing a positional relationship between a magnetic sensor of a magnetic field detecting unit and a magnet of a detected portion in another embodiment of the magnetic displacement detecting device according to the present invention.
- 34A is a front view
- FIG. 34B is a side view.
- FIG. 35A and 35B are views showing an example of the configuration of a magnetic sensor used in the magnetic displacement detection device according to the present invention.
- FIG. 35A is a front view of the core
- FIG. FIG. 2 is a front view of the magnetic sensor.
- FIG. 36 is a diagram illustrating an example of a configuration of a circuit unit used in the magnetic displacement detection device according to the present invention.
- FIG. 37 is a diagram illustrating an example of an output characteristic of the detection circuit unit.
- FIGS. 38A and 38B show actual measurement examples of the relationship between the relative movement distance and the sensor output by comparing the magnetic displacement detection device of the comparative example with the magnetic displacement detection device according to the present invention.
- FIG. 38A is a diagram showing a measurement result of the comparative example
- FIG. 38B is a diagram showing a measurement result of the example.
- FIG. 39 is a diagram showing the linearity error of each sensor output whose actual measurement results are shown in FIGS. 38A and 38B.
- FIG. 40A and FIG. 40B are diagrams showing a modified example of the configuration of the magnet used as the external magnetic field generating means of the detected part in the magnetic displacement detection device according to the present invention. Is a front view, and FIG. 40B is a side view.
- FIG. 41A and FIG. 41B are diagrams showing a modified example of the configuration of the magnet used as the external magnetic field generating means of the detected part in the magnetic displacement detection device according to the present invention.
- A is a front view
- FIG. 41B is a side view.
- FIGS. 42A and 42B show the magnetic displacement detection device according to the present invention.
- FIG. 7 is a diagram showing a modified example of the configuration of a magnet used as an external magnetic field generating means of a detected part in the present invention.
- Fig. 42A is a front view
- Fig. 42B is a side view.
- FIG. 43 is a diagram showing an application example of the magnetic displacement detection device according to the present invention shown in FIGS. 34A
- FIG. 44 is a partially cutaway perspective view of a gauge in which the magnetic displacement detection device according to the present invention is incorporated.
- FIGS. 45A and 45B are diagrams showing the configuration of the magnetic displacement detection device incorporated in the gauge shown in FIG. 44, wherein FIG. 45A is a front view and FIG. 45B is a side view. It is.
- Fig. 46A and Fig. 46B are diagrams showing the configuration of the magnetic sensor in the magnetic displacement detection device incorporated in the gauge described above.
- Fig. 46A is a front view of the core
- Fig. 46B is the magnetic sensor.
- FIG. 47 is a diagram showing displacement-magnetic field characteristics of the magnetic displacement detection device incorporated in the gauge.
- FIG. 48 is a partially cutaway perspective view of a gage incorporating the magnetic displacement detection device according to the present invention.
- FIG. 49A and FIG. 49B are diagrams showing the configuration of the magnetic displacement detection device according to the present invention.
- FIG. 49A is a plan view and FIG. 49B is a side view.
- FIG. 50 is a diagram showing displacement-magnetic field characteristics of a magnetic displacement detection device incorporated in the gauge shown in FIG.
- FIG. 51 is a diagram showing another arrangement example of the magnetic sensors in the magnetic displacement detection device according to the present invention.
- FIG. 52 is a diagram showing another winding example of the coil of the magnetic sensor in the magnetic displacement detection device according to the present invention.
- FIG. 53 shows another magnetic field used in the magnetic displacement detection device according to the present invention. It is a figure explaining an example of an air sensor.
- FIG. 54 is a side view of a vaporizer to which the present invention is applied.
- FIG. 55 is a cross-sectional view of the vaporizer.
- FIG. 56A and FIG. 56B are diagrams showing the configuration of the magnetic sensor used in the vaporizer.
- FIG. 56A is a front view of the core
- FIG. 56B is a front view of the magnetic sensor. .
- FIG. 57 is a perspective view of a magnet used in the vaporizer.
- FIG. 58 is a diagram illustrating the mounting position of the magnetic sensor and the magnet provided in the vaporizer.
- FIG. 59 is a diagram illustrating the positional relationship between the magnetic sensor and the magnet.
- FIG. 60 is an output characteristic diagram showing the output of the magnetic sensor with respect to the Biston valve of the vaporizer.
- FIGS. 61A and 61B are views for explaining the mounting positions of other magnetic sensors and magnets provided in the vaporizer.
- FIG. 61A is a front view
- FIG. 61B is a side view. is there.
- FIG. 62 is a side view of another vaporizer to which the present invention is applied.
- FIG. 63 is a cross-sectional view of the vaporizer shown in FIG.
- FIG. 64 is a diagram illustrating a magnet used in the vaporizer.
- Fig. 65A, Fig. 65B and Fig. 65C are diagrams for explaining the mounting position of the magnetic sensor and the magnet provided in the vaporizer.
- Fig. 65A is a front view
- Fig. 65B Is a plan view
- FIG. 65C is a side view.
- FIG. 66 is an output characteristic diagram showing the output of the magnetic sensor to the Biston valve of the vaporizer.
- a magnetic displacement detection device 100 of this embodiment is arranged along a magnetic field detection unit composed of an impedance change type magnetic sensor 104 and a relative movement direction of the magnetic field detection unit.
- a magnetic field detection unit composed of an impedance change type magnetic sensor 104 and a relative movement direction of the magnetic field detection unit.
- To be detected having permanent magnets 105 and 106 functioning as a magnetic field generating means for generating a magnetic field that continuously changes in the same direction, and an oscillation circuit section 107 for exciting and driving the magnetic sensor 104
- the magnetic sensor 104 is configured by forming a closed magnetic circuit and winding coils 102 and 103 at opposite pole positions of the annular core 101, respectively.
- the core 101 is made of, for example, a permary PC.
- the outer and inner diameters of the ring are 10 mm and 9 mm, respectively, and the core thickness is 50 mm.
- each of the coils 102 and 103 is formed by winding a copper wire having a diameter of 0.08 mm 50 times, and in this magnetic displacement detection device 100, FIG.
- two permanent magnets for example, SmCo
- the dimensions of the permanent magnets 105 and 106 are, for example, 10 mm and 3 mm in diameter and thickness, respectively.
- the permanent magnets 105, 106 are formed by two members (not shown) that move relative to each other in a machine tool, a precision measuring device, or the like. One of the members is separated by a predetermined distance along the relative movement direction, the center of the circle is positioned on the same straight line in the relative movement direction, and the same pole (S pole in Fig. 7) faces each other. It is mounted in a state where the direction of magnetization, in other words, the direction of magnetization is parallel to the direction of relative movement and opposite to each other.
- the permanent magnets 105, 106 and the detection target are constituted by known means for attaching them to the above members, but illustrations other than the permanent magnets 105, 106 are omitted. are doing.
- the magnetic sensor 104 is sandwiched between the permanent magnets 105 and 106 by the other one of the above two members, and connects the centers of the circles of the permanent magnets 105 and 106.
- the center of the ring of the core 101 is positioned on the line, and the core 101 is mounted in a state where a plane including the ring is parallel to the relative movement direction.
- the arrangement of the coils 102 and 103 in the magnetic sensor 104 is such that the positions of the coils 102 and 103 in the relative movement direction are equal, that is, from the permanent magnets 105 and 106.
- the distance to the coil 102 and the distance from the permanent magnets 105, 106 to the coil 103 are equal.
- a magnetic field detecting unit is constituted by the magnetic sensor 104 and a well-known means, such as a casing, for attaching the magnetic sensor to the remaining members, but illustration of components other than the magnetic sensor 104 is omitted.
- the magnetic sensor 104 includes an oscillator circuit 107 for exciting and driving the coils 102 and 103, and an output signal from the magnetic sensor 104. And a detection circuit section 108 for taking out the same.
- FIG. 1 An example of the configuration of the oscillation circuit section 107 and the detection circuit section 108 is shown in FIG.
- the oscillator circuit 107 consists of a resistor, a capacitor, a switching transistor, etc. using a multivibrator circuit, and has a frequency of about 1 1, a pulse with a level difference between the beaks of 5 V. Wave voltage is supplied to coils 102 and 103. The duty ratio of this pulse wave is determined by the resistor R1 in FIG. 10, and is set to about 1/10 here. Also, in the oscillation circuit section 107, the schmitt ringer IC having hysteresis is used to eliminate the chasing ring.
- a sine wave voltage may be supplied to the coils 102 and 103 instead of the pulse wave.
- the current consumption can be reduced by adjusting the duty ratio, and if a sine wave is supplied, a DC bias must be applied. It is suitable.
- the detection circuit section 108 is made up of coils 102 and 103 by a bridge circuit 108 A composed of coils 102 and 103 of the magnetic sensor 104 and resistors R4 and R5. An unbalanced voltage output corresponding to the impedance change of the bridge circuit is obtained, and the unbalanced voltage output of this bridge circuit is detected by the diodes D 1 and D 2, and the detected output is a CR smoothing circuit including resistors and capacitors. Smoothing at 8 B, differential output V of voltage change due to coil 102 impedance change and voltage change due to coil 103 impedance change. Are configured to obtain Thus, the differential output V of the voltage change due to the impedance change of the two coils 102 and 103. By detecting the absolute displacement amount from, the influence of noise from the outside world can be reduced and detection can be performed with high accuracy.
- the coil 108 A composed of coils 102 and 103 of the magnetic sensor 104 and resistors R4 and R5.
- the detection circuit unit 108 Since the impedance change of 102 and 103 is large, the detection circuit unit 108 is not provided with an amplifier for the output signal, and the configuration of the detection circuit unit 108 is simplified accordingly. I have.
- the output from the detection circuit unit 108 is sent to a control device (not shown), and the absolute displacement amount between the magnetic field detection unit and the detected portion is calculated by a known method in the control device.
- the relationship between the displacement amount of the magnetic sensor 104 in the relative movement direction and the level of the differential output in the detection circuit unit 108 (displacement-output characteristic)
- Fig. 11 The position of the displacement of 18.0 mm in Fig. 11 is the distance from the permanent magnet 105 to the center of the ring of the core 101 and the center of the ring of the core 101 from the permanent magnet 106. It corresponds to a position where the distance to is equal.
- the relative displacement between the two permanent magnets 105 and 106 whose magnetic directions are opposite to each other is magnetic field detector. Since they are arranged apart from each other along the direction of movement, the distribution of the magnetic field generated between these magnetic field generating means is bilaterally symmetric about the same distance from both permanent magnets 105, 106. At the same time, the linearity changes with the position of the relative movement improvement.
- the core 10 Since the impedance of the coils 102 and 103 changes when the magnetic permeability of 1 changes, a signal corresponding to the external magnetic field is output from the coil. Therefore, when the external magnetic field generated by the permanent magnets 105 and 106 has the distribution described above, a signal that changes with high linearity according to the position in the relative movement direction is transmitted from the magnetic sensor 104 to the detection circuit unit. It will be taken out at 108. As a result, the absolute displacement between the magnetic field detecting section and the detected section is detected with high accuracy.
- the coil-type magnetic sensor 104 has extremely high sensitivity, and the impedance changes even with a magnetic field of about the earth's magnetic field.
- Figure 12 shows an example of the relationship between the strength of the magnetic field and the impedance of the coil, where the impedance of the coil changes by about 10% with respect to a magnetic field change of 1 elst (O e). However, it is shown that the impedance of the coil changes by about 50% while the magnetic field changes from about 11 to +12 eelsteads. Since the sensitivity of the magnetic sensor 104 is high as described above, it is possible to detect a weak magnetic field that cannot be detected by an MR (magnetoresistive) element, a Hall element, or the like that is usually used for detecting a magnetic field.
- MR magnetoresistive
- the magnetic field exerted by the magnetic field generating means can be reliably detected even at a position distant from the magnetic field generating means, and the output according to the strength of the magnetic field can be detected. Can be obtained.
- a large output that does not need to be amplified by an amplifier can be obtained by selecting a resistor having an appropriate value according to the impedance and obtaining a preset output.
- the effective length can be made longer than the ineffective length.
- the response speed does not decrease as in the above-described magnetostrictive wire system.
- the driving frequency of the coil is set to a high frequency of, for example, several 10 kHz to several MHz, the impedance of the coil is easily increased without changing the impedance change characteristic with respect to an external magnetic field. Therefore, the impedance can be easily adjusted according to the peripheral circuit.
- the response speed depends on the drive frequency (approximately 1/10 of the drive frequency), the response speed is further increased by such a higher frequency to detect the absolute displacement at a very high speed. Will be able to do it.
- the magnetic sensor 104 of the magnetic field detecting section is replaced by a coil 11 1, 1 2 on two opposite sides of a rectangular annular core 11 1 as shown in FIG. 13 instead of the configuration shown in FIG. A magnetic sensor 111 wound around 13 or two parallel rod-shaped cores separated by a predetermined distance as shown in Fig. 14
- the magnetic sensors 124 constituted by winding the coils 122 and 123 around the terminals 121A and 121B, respectively, may be used.
- the material and core thickness of these cores 11 1, 12 1 A and 12 1 mm and the material and number of turns of the coils 11 12, 11 3, 12 1 and 122 are the same as those shown in Fig. 8 above. It may be the same as 101 or coils 102 and 103.
- an appropriate means for example, an electromagnet
- an electromagnet other than the permanent magnet
- a material having high magnetic permeability such as amorphous may be used.
- FIG. 15 shows a modified example using the magnetic sensor 124 having the configuration shown in FIG. 14 in the embodiment shown in FIGS. 7 to 12 described above.
- the magnetic sensor 124 of the magnetic field detector is composed of two rod-shaped cores 1 2 1, on which coils 122 and 123 are wound. 1, 1 are arranged parallel to each other at a predetermined distance from each other while being parallel to the relative movement direction of the magnetic field detecting unit and the detected unit.
- FIG. 16 shows another embodiment of the magnetic displacement detection device according to the present invention.
- the magnetic sensor 104 is sandwiched between the permanent magnets 105 and 106 by two members (not shown) which move relatively in a machine tool or a precision measuring device.
- the center of the ring of the core 101 is located on the line connecting the centers of the circles of the permanent magnets 105 and 106, and is mounted in a state where the plane including the ring is parallel to the relative movement direction. I have.
- the arrangement of coils 102 and 103 in magnetic sensor 104 is such that coil 102 and coiler 103 are They are separated from each other along the anti-movement direction, and are in the same position in the direction perpendicular to the relative movement direction.
- a magnetic field detecting unit is constituted by the magnetic sensor 104 and a well-known means, such as a casing, for attaching the magnetic sensor to the remaining members, but illustrations other than the magnetic sensor 104 are omitted.
- the configuration of the other portions may be completely the same as the embodiment shown in FIGS. 7 to 12, and the same portions will be denoted by the same reference characters, without redundant description.
- the relationship between the displacement amount of the magnetic sensor 104 in the relative movement direction and the level of the differential output in the detection circuit portion 108 (displacement) —Output characteristics) are as shown in FIG. 11 similarly to the above-described embodiment.
- the external magnetic field applied to the coil 102 from the permanent magnets 105, 106 and the external magnetic field applied to the coil 103 are equal in magnitude and opposite in direction. Therefore, the output from the coil 102 and the output from the coil 103 are equal in magnitude, and the level of the differential output is zero. With this position as the center, the differential output changes with high linearity. As a result, the absolute displacement can be detected with high accuracy.
- the magnetic displacement detecting device 130 when the coils 102 and 103 of the magnetic sensor 104 are excited and driven by the oscillation circuit portion 107, the permeability of the core 101 to the external magnetic field is reduced. As the impedance changes, the impedance of the coils 102 and 103 changes, and a signal corresponding to the external magnetic field is output. And two coils 1 0 2, 1 0 3 Are arranged at a distance from each other along the direction of relative movement with the part to be detected, so that the strength of the magnetic field applied to these coils 102 and 103 from the magnetic field generating means is A coil farther from the means is weaker than a coil closer to the magnetic field generating means.
- the strength of the magnetic field from the magnetic field generating means changes in a curve according to the distance to the magnetic field generating means
- the characteristics of the output of each of the coils 102 and 103 are roughly shown in FIG. As shown, it changes in a curve according to the distance from the magnetic field generating means. Therefore, the differential output of these coils 102 and 103 (for example, the differential output corresponding to a constant interval A in FIG. 17) is located at the position of the magnetic sensor 104 in the relative movement direction. A change with high linearity is made accordingly. As a result, the absolute displacement amount between the magnetic field detection unit and the detection target is detected with high accuracy.
- FIGS. 18A and 18B show modifications of the embodiment shown in FIG. 16 described above using the magnetic sensor 124 having the configuration shown in FIG.
- the magnetic sensor 124 of the magnetic field detection unit is composed of two rod-shaped cores 122 1 A, wound with coils 122, 123. 1 2 1 B are arranged parallel to each other at a predetermined distance from each other in a state perpendicular to the direction of relative movement between the magnetic field detecting section and the detected section.
- FIG. 19A, FIG. 19B and FIG. 20 show the magnetic transformation according to the present invention. 9 shows another embodiment of the position detecting device.
- the magnetic displacement detector 150 of this embodiment as shown in FIGS. 19A and 19B, two magnetic fields are generated by plate-like permanent magnets 115 and 116 magnetized in the thickness direction.
- the generating means are respectively constituted.
- the dimensions of the permanent magnets 1 15 and 1 16 are, for example, 10 mm, 5 mm and 3 mm, respectively, in vertical, horizontal and thickness.
- the permanent magnets 1 15 and 1 16 are arranged so that the direction of magnetization is different from those of the permanent magnets 105 and 106 in FIG. That is, as shown in FIG. 20, the permanent magnets 1 15 and 1 16 are arranged such that the directions of magnetization are opposite to each other and perpendicular to the direction of relative movement. As a result, the longitudinal direction of the coils 102 and 103 of the magnetic sensor 104 is orthogonal to the direction of the magnetic field generated by the permanent magnets 115 and 116.
- the configuration of the other portions may be completely the same as the embodiment shown in FIGS. 7 to 12, and the same portions will be denoted by the same reference characters and redundant description will be omitted.
- the magnetic sensor 104 is placed at a position close to the permanent magnets 115, 116, and the coils 102, 103
- the amount of magnetic flux entering the longitudinal direction of 03 is much smaller than in the case of the embodiment shown in FIG.
- the saturation of the output of the coils 102 and 103 is saturated and the impedance change does not occur at the position where the impedance does not change.
- the effective length that is, the magnitude of the detectable absolute displacement amount can be increased.
- FIG. 21 shows still another example of the magnetic displacement detection device according to the present invention. An example will be described.
- the permanent magnets 115 and 116 are arranged so that the directions of magnetization are opposite to each other and perpendicular to the direction of relative movement. Then, the coil 102 and the coil 103 in the magnetic sensor 104 are separated from each other along the relative movement direction, and are in the same position in the direction orthogonal to the relative movement direction. .
- a magnetic field detecting unit is constituted by the magnetic sensor 104 and a known means, such as a casing, for attaching the magnetic sensor 104 to the remaining members, but illustrations other than the magnetic sensor 104 are omitted. Other configurations may be completely the same as those of the embodiment shown in FIGS. 19 and 20. Therefore, the same portions will be denoted by the same reference characters and redundant description will be omitted.
- FIGS. 22A and 22B show still another embodiment of the magnetic displacement detecting device according to the present invention.
- the arrangement of the magnetic sensor 104 is different from the embodiments shown in FIG. 7 and FIG. That is, the magnetic sensors 104 are arranged so that a plane including the ring is orthogonal to the relative movement direction.
- the permanent magnets 1 15 and 1 16 are arranged in the same state as the embodiment shown in FIG. Other configurations may be completely the same as those of the embodiment shown in FIGS. 7 to 12, and thus redundant description will be omitted.
- the illustration of the oscillation circuit section and the detection circuit section is also omitted.
- FIGS. 23 to 25 show still another embodiment of the magnetic displacement detecting device according to the present invention.
- an elongated thin plate-shaped high magnetic permeability material 13 2 (corresponding to a core) is formed on a substrate 13 1. Between the insulating film 1 3 3 and the insulating film 1 3 4 It is rare. On the upper side of the insulating film 133, a plurality of elongated thin plate-like upper electrodes 135 are provided at predetermined intervals so as to be orthogonal to the high permeability material 132.
- a plurality of elongated thin plate-like lower electrodes 1 3 6 are made of a material with high magnetic permeability so that both ends overlap the ends of the two upper electrodes 1 3 5 adjacent to each other. It is provided obliquely with 132. By connecting each end of the upper electrode 135 to each end of the lower electrode 135, a thin coil 133 is formed around the high permeability material 132. . On the upper side of the coil 13 7, a protective film 1 38 is formed.
- a thin magnetic sensor 1339 is formed as shown in FIG. It is configured.
- two permanent magnetic field generating means are respectively constituted by plate-like permanent magnets 125 and 126 which are magnetized in a direction parallel to the plate surface. ing.
- the permanent magnets 125 and 126 are separated from one of the two members (not shown) that move relatively by a predetermined distance along the direction of relative movement. They are mounted with the plate surfaces parallel to each other and with the same poles (S poles in Fig. 25) facing each other.
- the magnetic sensor 1339 has a structure in which the plate surface of the substrate 131 is parallel to the plate surface of the permanent magnet 125.126 and has high magnetic permeability on the remaining one of the two members.
- the members 13 are mounted in a state where the longitudinal direction of the members 13 and the relative movement direction are parallel to each other.
- the magnetic sensor 139 is connected to the oscillation circuit and the detection circuit (not shown) via a thin flexible printed cable FPC. Configuration of other parts May be exactly the same as the embodiment shown in FIGS.
- the magnetic field detection unit having the magnetic sensor 1339 is thinned, and the size of the magnetic displacement detection device 180 on a plane orthogonal to the relative movement direction is reduced. Since the height is determined by the dimensions of the magnetic field detection unit, the overall device is made thinner. Therefore, it is possible to further reduce the size of the magnetic displacement detection device.
- the magnetic sensor 13 is provided with a permanent magnet 1 on the other one of the above two members.
- the high-permeability material 1332 may be mounted in such a state that it is parallel to the plate surfaces of the plates 25 and 126 and the longitudinal direction of the high-permeability material 132 is perpendicular to the relative movement direction.
- FIG. 27 shows an embodiment corresponding to a case where the number of magnetic field generating means is one in the embodiment shown in FIG.
- one permanent magnet 105 (having the configuration shown in FIGS. 9A and 9B) has two members that move relatively. (Not shown) is mounted in a state where the direction of magnetization is oriented parallel to the direction of relative movement. Also, the magnetic sensor 104 (having the configuration shown in FIG. 8) is positioned such that the center of the circle of the permanent magnet 105 and the center of the ring of the core 101 are in the same straight line in the relative movement direction, Further, it is attached to the other one of the two members in a state where the plane including the ring and the relative movement direction are parallel to each other.
- the arrangement of the coils 102 and 103 in the magnetic sensor 104 is such that the positions of the coils 102 and 103 in the relative movement direction are equal, that is, from the permanent magnet 105 to the coil 101.
- the distance to 2 and the distance from the permanent magnet 105 to the coil 103 are equal.
- the magnetic sensor 104 includes an oscillation circuit 107 for exciting and driving the coils 102 and 103, and a detection circuit 104 for extracting an output signal from the magnetic sensor 104. And are connected.
- the configurations of the oscillation circuit unit 107 and the detection circuit unit 108 are as illustrated in FIG.
- FIG. 29 shows an embodiment corresponding to the case where the number of magnetic field generating means is one in the embodiment shown in FIG. 16 described above.
- the relative movement direction is applied to one of the two members relatively moving in a machine tool, a precision measurement device, or the like.
- a rod 122 extending to the end is attached, and a permanent magnet 105 is attached to a tip of the rod 121. That is, the detected part having the permanent magnet 105 and the mouth 211 is attached to the member.
- the arrangement of the permanent magnets 105 is such that the direction of magnetization is parallel to the direction of relative movement.
- the case 2 1 in which the rod 2 1 is inserted into the other one of the above 2 members via the bearing 2 1 2 so as to be movable in the longitudinal direction. 3 is installed.
- the center of the circle of the permanent magnet 105 and the center of the ring of the core 101 are located on the same line in the relative movement direction, and the magnetic sensor 104 is located inside the case 2 13. It is mounted so that the plane including the ring and the relative movement direction are parallel. That is, a magnetic field detecting unit having the magnetic sensor 104, the bearing 2 12, and the case 2 13 is attached to the remaining members.
- the arrangement of the coils 102 and 103 in the magnetic sensor 104 is such that the coil 102 and the coil 103 are separated from each other along the relative movement direction and in a direction orthogonal to the relative movement direction. Are in the same position. That is, the longitudinal directions of the coils 102 and 103 are orthogonal to the direction of relative movement. As a result, the longitudinal directions of the coils 102 and 103 are orthogonal to the direction of the magnetic field generated by the permanent magnet 105.
- FIG. 30 shows an embodiment corresponding to the embodiment shown in FIGS. 19 and 20 in which the number of magnetic field generating means is one.
- one permanent magnet 1 15 shows the magnetization direction in FIG. 27.
- the magnets are arranged in a direction different from that of the permanent magnet 105 in the embodiment. That is, the permanent magnets 115 are arranged such that the direction of magnetization is orthogonal to the direction of relative movement.
- the longitudinal direction of the coils 102 and 103 of the magnetic sensor 104 and the direction of the magnetic field generated by the permanent magnets 115 are orthogonal to each other.
- the configuration of the other parts may be completely the same as that of the embodiment shown in FIG.
- FIG. 31 shows an embodiment corresponding to a case where the number of magnetic field generating means is one in the embodiment shown in FIG.
- the arrangement of the magnetic sensor 104 is different from that shown in FIGS. That is, the magnetic sensor 104 is arranged so that a plane including the ring is orthogonal to the direction of relative movement between the magnetic field detection unit and the detection target.
- the permanent magnets 115 are arranged in the same state as in the embodiment shown in FIG.
- the configuration of the other portions may be completely the same as that of the embodiment shown in FIG.
- the illustration of the oscillation circuit section and the detection circuit section is also omitted. In other embodiments, the number of magnetic field generating means may be reduced to one.
- the arrangement of the two coils 102, 103 in the magnetic sensor 1 ⁇ 4 is separated not only in the direction along the direction of relative movement but also in the direction orthogonal thereto, for example, as shown in FIG.
- the coils 102 and 103 may be arranged in a state where the longitudinal direction is inclined 45 degrees with respect to the relative movement direction.
- FIGS. 33A and 33B show an example of a magnetic field generating means provided in a detected portion of the magnetic displacement detection device 300
- FIG. 33A is a plan view
- FIG. 33B is a side view.
- This magnetic field generating means is a thin plate-shaped magnet 301 (for example, a rubber magnet, a ferrite) having a length of L or more, which is an effective length (length required by the user) for detecting the absolute displacement amount in the magnetic displacement detection device.
- Permanent magnets such as alloy magnets, alloy magnets, etc., so that the left half and right half of the plate surface are opposite in polarity to each other with respect to the center line of the length improvement. It is magnetized.
- the magnet 301 includes two magnetic poles which are close to each other and whose polar faces are opposite to each other.
- This magnet 301 tilts the longitudinal direction at an angle 0 from the relative movement axis X to one of two members (not shown) that relatively move in the machine tool or the like to be detected.
- the magnet is mounted so that the length of the magnet 301 on the axis X is longer than the effective length L.
- the effective length L is the position where the center in the width direction of one magnetic pole intersects the relative movement axis X and the position where the center in the width direction of the other magnetic pole intersects the relative movement axis X.
- Is set as the distance between 0 is an angle set within the range of O ⁇ tan- 1 (w / L), where w is the distance between the centers of these two magnetic poles.
- the detected part is constituted by this magnet 301 and a well-known means for attaching it to the above-mentioned member. Omitted.
- the magnetic sensor 302 of the magnetic field detector is located on a plane parallel to the axis X of relative movement with the magnet 301 shown in FIGS. 33A and 33B and perpendicular to the drawing.
- FIGS. 34A and 34B show the positional relationship between the magnetic sensor 302 and the magnet 301 from different viewpoints.
- FIG. 34A is a front view
- FIG. 34B is a side view.
- FIG. A magnetic sensor 302 is attached to a remaining member of the two members relatively moving in the machine tool or the like so as to provide a clearance of a distance k from the magnet 301.
- a magnetic field detecting unit is constituted by the magnetic sensor 302 and a known means for attaching the magnetic sensor 302 to the remaining members, such as casing, but illustrations other than the magnetic sensor 302 are omitted. .
- FIGS. 35A and 35B A specific example of the configuration of the magnetic sensor 302 is shown in FIGS. 35A and 35B. That is, a rectangular annular core 303 having a closed magnetic path as shown in FIG. 35A (for example, made of a magnetic material such as permalloy and having a vertical outer diameter and inner diameter of 5 mm, 2 mm, As shown in Fig. 35B, the coils 300 and 500 are mounted on the opposite poles of the outer diameter and inner diameter of 2 mm and 1 mm, respectively, and the core thickness is 50 mm in the lateral direction, as shown in Fig. 35B.
- the core-type magnetic sensor 302 is formed by winding the coil 360 a predetermined number of times (for example, 50 times).
- Such a core type magnetic sensor 302 is less expensive and has a simpler structure than other magnetic sensors using an MR element, an FG element, a Hall element, or the like.
- the reason why the two coils are wound around the magnetic sensor 302 is to detect the difference between the signals from both coils in the detection circuit section described later, and to cancel the influence of the electrical noise. This is to obtain a more accurate output.
- the shape of the core of the magnetic sensor 302 is not limited to the rectangular annular shape as shown in FIGS. 35A and 35B, as long as it can wind two coils in this way.
- a coil may be wound around an annular member or two parallel rod-shaped cores separated by a predetermined distance.
- FIG. 36 shows an oscillation circuit section 307 for driving the coils 305 and 306 of the magnetic sensor 302, and a detection circuit section 307 for extracting an output signal from the magnetic sensor 302.
- the oscillating circuit section 307 applies a multivibrator circuit, and generates a pulse wave voltage with a level difference between peaks of 12 V, a frequency of about 1 MHz, and a duty ratio of 1/10, for example.
- the coils are supplied to coils 3 and 5.
- the detection circuit section 308 uses a bridge circuit, and is configured to take the DC output differential obtained by rectifying the signals from the coils 305 and 306, respectively.
- the output from the detection circuit unit is sent to a control device (not shown), and the control device calculates the absolute displacement amount between the magnetic field detection unit and the detected portion by a known method.
- Output characteristics of the detection circuit section 308 when the coils 305 and 306 of the magnetic sensor 302 are driven by the oscillation circuit section 307 of the circuit section 309 (external magnetic field strength and output FIG. 37 shows an example of the relationship with the voltage).
- the angle is determined from the relationship 0 ⁇ 6 » ⁇ tan— 1 (w / L) described above. 6> becomes much smaller, and the linearity of the change of the magnetic field is higher near the point of change of the magnetic pole (the boundary between two magnetic poles) than near the center of the magnetic pole. Therefore, the magnetic sensor provided in the magnetic field detection unit is required to detect a slight change in the magnetic field at the change point of the magnetic pole.
- the magnetic sensor 302 detects only a magnetic field component incident in the longitudinal direction (X direction in FIG. 33) of the coils 300 and 306, and is weak as much as geomagnetism. Since the impedance changes even in the magnetic field, the sensitivity is high enough to sufficiently detect such a small change in the magnetic field at the change point of the magnetic pole.
- the two magnetic poles included in the magnet 301 are close to each other, so that the linearity of the magnetic field change between these magnetic poles is very high.
- the length on the relative movement axis X is higher from one of the two magnetic poles of the magnet 301 having the effective length L or more to the other.
- a magnetic field that changes with linearity is detected by the magnetic sensor 302.
- the output linearity is improved, but the magnetic field from the magnet 301 to the magnetic sensor 302 becomes stronger, Since the sensor 302 becomes easily saturated, the effective length L cannot be increased.
- the clearance k is widened, the linearity of the output is reduced, but the magnetic field from the magnet 301 to the magnetic sensor 302 is weak. And the magnetic sensor 302 becomes hard to be saturated, so that the effective length L can be increased.
- the magnitude of the clearance k is appropriately set in accordance with the strength of the magnetic field of the magnet 301 and the sensitivity of the magnetic sensor 302.
- a rubber magnet of 50 mm, 10 mm, and 0.7 mm in length, width, and thickness, respectively, is used for magnet 301, and the effective length L is 30 mm or more.
- FIG. 38A shows the relationship between the relative movement distance and the sensor output in the comparative example of the configuration shown in FIG. 7, and FIG. 38B shows the relationship between the relative movement distance and the sensor output in this embodiment. Shown respectively.
- Fig. 39 shows the linearity error of the two in comparison. As is clear from FIG. 39, while the linearity error is about 2% in the comparative example, the linearity error is suppressed to less than 1% in this embodiment. Therefore, according to the magnetic displacement detection device 300 of this embodiment, the output linearity can be improved.
- the magnetic sensor 302 is arranged such that the plane including the closed magnetic path of the core is parallel to the relative movement axis X.
- the magnetic sensor 302 may be arranged in a state perpendicular to the relative movement axis X.
- FIGS. 40 to 43 show modified examples of the configuration of the magnet provided in the detected part.
- one thin plate-shaped magnet 311 with a length equal to or greater than the effective length L is tilted by an angle 0 from the top in its length direction.
- the left and right halves of the plate surface are magnetized so that the polarities of the magnetic pole surfaces are opposite to each other with respect to the dashed line.
- the magnet 311 also includes two magnetic poles that are close to each other and whose polar faces are opposite to each other, similarly to the magnet 310.
- the magnet 311 is attached to one of two relatively moving members (not shown) with its length direction parallel to the relative movement axis X. Therefore, the length of the magnet 311 on the relative movement axis X is still longer than the effective length L.
- two elongated magnets 312 and 313 each having an elongated shape longer than the effective length L are arranged so that the polarities of the pole faces of the two magnets are opposite to each other. It is magnetized.
- the magnets 312 and 313 also include two magnetic poles which are close to each other and whose polar faces are opposite to each other, like the magnet 301.
- these magnets 3 1 2 and 3 1 3 are tilted in the longitudinal direction by an angle 6> from the relative movement axis X to one of the two members (not shown) that move relatively, Also, the magnets 312 and 313 on the relative movement axis X are attached to each other at a predetermined distance a (for example, 2 mm) from each other with the length of the magnets 312 and 313 being equal to or longer than the effective length L. .
- the magnets 301 shown in FIGS. 33A and 33B and the magnets shown in FIGS. 4OA and 40B can be used.
- the boundary between the magnetic poles is clearer than when one magnet is magnetized so that the polarities of the magnetic pole surfaces are opposite to each other, as in the case of the magnet 311. Therefore, the output linearity can be further improved.
- the magnet 312 and the magnet 311 are separated from each other, but they may be in contact with each other.
- one magnet 314 in the form of a thin plate longer than the effective length L is connected to the left and right halves of the plate surface with respect to the center line in the width direction. Are magnetized so that the polarities of the magnetic pole faces are opposite.
- the magnets 3 14 also include two magnetic poles which are close to each other and whose polar faces are opposite to each other, like the magnet 1. Then, the magnet 3 14 is tilted by one angle S from the relative movement axis X with respect to the magnetic sensor 302 to one of the two members (not shown) which move relatively, and The magnets 3 1 and 4 on the relative movement axis X are installed so that the length is longer than the effective length L.
- FIG. 43 shows an application example of the magnetic displacement detection device according to the present invention.
- the magnets 315 and 316 as shown in the above embodiment, and correspondingly, are parallel to the relative movement axes X1 and X2 shown in FIG.
- Two sets of magnetic sensors (not shown) located on a plane are provided. Then, in a detection circuit section (not shown), the differential of the output signal taken from each set of magnetic sensors is obtained.
- the magnets 3 15 and 3 16 have the same configuration as the magnet 310 shown in FIGS. 33A and 33B, but are not shown in FIGS. Of course, a structure similar to that shown in 42 may be used.
- a displacement detection device When a displacement detection device is actually installed on a detection target such as a machine tool, one of the magnets or the magnetic sensor must be mounted at a position separated from the rotation center axis of the rotatable member due to space or other reasons. You may have to. In such a case, when the member rotates, the clearance between the magnet and the magnetic sensor changes, so that the output signal of the magnetic sensor changes, thereby deteriorating the detection accuracy.
- two sets of magnets and magnetic sensors are provided as in this application example, and they are mounted at symmetrical positions with respect to the rotation center axis. If the output of each magnetic sensor is determined based on the output of the differential signal of the output signal without rotation, then if the rotation occurs, If this is used as an offset signal and signal processing is performed so that it becomes a reference value, deterioration of detection accuracy can be prevented.
- a permanent magnet is used as the magnetic field generating means of the detected portion.
- an electromagnet or the like may be used as the magnetic field generating means.
- permalloy is used as the material of the core of the magnetic sensor, but a high magnetic permeability material such as amorphous may be used as the material of the core.
- two coils are provided in the magnetic sensor and the absolute displacement is detected based on the differential output of the coils.
- the absolute displacement may be detected based on the output of the coil itself. In that case, it is needless to say that there is no need to provide a circuit for obtaining the differential in the detection circuit section.
- FIGS. 44 to 47 show specific examples in which the magnetic displacement detection device according to the present invention is incorporated in a gauge 401.
- FIG. 44 to 47 show specific examples in which the magnetic displacement detection device according to the present invention is incorporated in a gauge 401.
- the spindle part 405 is slidable in the axial direction on the bearings 403, 404 provided in the housing 404 of the gauge 401. It is generally supported by
- a guide shaft 406 protruding in a direction orthogonal to the axial direction of the spindle shaft 405 is provided in the housing 402, and a tip end of the guide shaft 406 is provided. However, it is inserted and engaged in a guide slot 407 formed on the side of the housing 402 in parallel with the sliding direction of the spindle shaft 405. Therefore, the spindle shaft 405 is slidable within the guide hole 406 within the guide slot 407. Further, a spring 409 is stretched between the guide shaft 406 and a claw piece 408 protruding from the inner surface of the side of the housing 402, and this spring 409 is provided. Due to this force, the spindle shaft 405 is always biased in one direction, that is, in a direction protruding from the bearing portion 403.
- a magnetic displacement detection device 400 is incorporated between the spindle axis 405 and the housing 402.
- the magnetic displacement detecting device 400 includes a magnetic field detecting section having a magnetic sensor 410 and a detected section having two permanent magnets 415, 416 as magnetic field generating means.
- the detailed configuration is shown in Fig. 45A and Fig. 45B.
- the magnetic sensor 410 of the magnetic field detecting unit is configured by winding coils 412 and 413 around opposite pole positions of the short annular core 411 forming a closed magnetic circuit.
- the core 411 is made of a material having high magnetic permeability, for example, permalloy, and its dimensions are, as an example, an outer diameter of 5 mm, a width of 2 mm, and an inner diameter of 2 mm and a width of 1 mm as shown in FIG. 46A.
- the thickness is 50 / m.
- the coils 4 12 and 4 13 are formed by winding a conductor having a diameter of 0.06 mm 50 times, and in actuality, as shown in FIG. It is wound on.
- the two permanent magnets 4 15 and 4 16 as the magnetic field generating means are made of, for example, SmCo, and their dimensions are, for example, 7 mm long, 5 mm wide, and 1 mm thick. Then, these two permanent magnets 4 15 and 4 16 move along the direction of relative movement with the magnetic sensor 4 10 in a state where the magnetization directions are opposite to each other as shown in FIG. 45A.
- the magnetic sensor 4 10 They are arranged at a predetermined distance from each other.
- the magnetic sensor 4 10 is sandwiched between the two permanent magnets 4 1 5 and 4 1 6, and a straight line passing through the center of the permanent magnets 4 1 5 and 4 16 The center is located, and the plane including the ring is arranged in a state perpendicular to the direction of relative movement.
- the magnetic sensor 410 is fixed to the bottom of the housing 2 via the sensor holder 417 as shown in FIG. 44, while the permanent magnets 415 and 416 are scale holders 414.
- the spindle shaft 405 is fixed to the spindle 405 via the pin 18, that is, when the spindle shaft 405 is slid into and out of the housing 402, the spindle shaft 405 is permanently attached to the spindle 405.
- the structure is such that the magnets 415 and 416 are moved with respect to the magnetic sensor 410.
- an oscillation circuit for exciting and driving the coil of the magnetic sensor 410 and a detection circuit for extracting an output signal from the magnetic sensor 410 are provided inside the housing 410 of the gauge 410.
- the circuit board 4 21 is mounted, and the circuit board 4 2 1 is electrically connected to the magnetic sensor 4 10, and the circuit board 4 2 1 is connected to the housing 4 2 A cable 4 2 2 is led out.
- the oscillation circuit section 107 and the detection circuit section 108 shown in FIG. 10 described above are provided on the circuit board 421.
- the output from the detection circuit unit 108 is sent to a control device (not shown), and the control unit uses a well-known method to detect the magnetic sensor 411 of the magnetic field detection unit and the permanent magnets 415, 416 of the detected unit. And the absolute displacement is obtained.
- the two permanent magnets 4 1 5, 3 P are The two permanent magnets 4 1 5, 3 P
- Fig. 47 shows the displacement-magnetic field characteristics obtained by actually measuring the strength of the magnetic field received by the sensor 410 between 4 and 16 for each displacement position.
- FIGS. 48 to 50 show other specific examples in which the magnetic displacement detecting device according to the present invention is incorporated in a gauge 401.
- the magnetic displacement detection device 450 of this specific example is an improvement of the specific examples shown in FIGS. 44 to 47 described above.
- the two permanent magnets 4 15 , 4 16 are connected by two opposing connection plates 4 19, 4 20 made of a high magnetic permeability material, as shown in FIGS. 49A and 49B.
- permalloy is suitably used as a material having high magnetic permeability for the connection plates 419 and 420, and its dimensions are, for example, 5 mm in length, 30 mm in width, and 0.1 mm in thickness.
- the two connecting plates 4 19 and 20 are placed in a state where the magnetic sensor 4 10 is sandwiched along the direction of relative movement between the magnetic sensor 4 10 and the permanent magnets 4 15 and 4 16. It is fixed so as to bridge between the permanent magnets 4 15 and 4 16.
- two permanent magnets 415 and 416 are connected by connecting plates 419 and 420 made of a material having high magnetic permeability. As shown in 0, it was recognized that the linearity of the displacement-magnetic field characteristics was significantly improved.
- Fig. 50 shows the measurement of the strength of the magnetic field received by the magnetic sensor 410 between the two permanent magnets 4 15 and 4 16 for each displacement position.
- Fig. 44 Although the strength of the magnetic field decreases compared to the example, the linear region of the magnetic field becomes wider, that is, almost perfect linearity is secured. Therefore, it is possible to detect the absolute displacement amount between the magnetic sensor 410 and the permanent magnets 415, 416 with higher accuracy, and a great effect can be obtained for improving the performance of the magnetic displacement detection device. Things.
- the magnetic sensor 410 of the magnetic field detector is mounted with the plane of the core 411 perpendicular to the direction of relative movement. However, as in the magnetic displacement detector 460 shown in FIG. It may be mounted so that the plane 1 is parallel to the direction of relative movement.
- the positions of the coils 4 12 and 4 13 wound around the core 4 11 may be changed as in a magnetic displacement detection device 470 shown in FIG.
- a magnetic sensor of the magnetic detection unit in the magnetic displacement detection device As a magnetic sensor of the magnetic detection unit in the magnetic displacement detection device according to the present invention, a coil-type magnetic sensor driven by a high-frequency pulse and whose impedance changes with respect to an external magnetic field is used.
- the magnetic sensor of the magnetic detection unit may be an impedance change type magnetic sensor having two magnetic sensing parts whose impedance changes according to the strength of an external magnetic field.
- a so-called magnetic impedance effect (Ml) element as proposed in JP-A-6-2817112 may be used.
- This Ml element is made of an amorphous alloy made of Fe, Si, Co, B, or the like.
- This MI element has a substantially wire shape as shown in FIG. In this Ml element, when high-frequency current is applied in the longitudinal direction, an impedance change occurs with respect to an external magnetic field incident in the longitudinal direction.
- the magnetic sensor 480 using this MI element is composed of two elements 481 and 482 so as to obtain a differential output as shown in FIG. This PC 1
- the magnetic sensor 480 using the 48 MI elements can drive and detect signals using the oscillation circuit and the detection circuit having the configurations shown in FIGS. 10 and 36 described above.
- the magnetic sensor 480 using such an Ml element is inexpensive and has good characteristics, the detection accuracy of the magnetic displacement detection device can be improved, and the cost can be reduced. Can be.
- FIG. 54 shows a side view of a vaporizer to which the present invention is applied
- FIG. 55 shows a cross-sectional view taken along the line XX ′ of the vaporizer shown in FIG.
- the vaporizer 501 is provided with a so-called direct-acting valve.
- the vaporizer 501 is connected to the main body 502 and the fuel introduction passage 514 of the main body 502 to inject liquid fuel. And a chamber 503.
- the main body 502 is inserted into a cap body 504 and a valve chamber 512 formed in the cap body 504, and opens and closes a venturi passage 5111 formed in the cap body 504.
- the cap body 504 is made of, for example, zinc die-cast, and has a venturi passage 511 through which intake air flows in the direction a indicated by an arrow in FIG.
- the cap body 504 is a cylinder that extends vertically upward from the bench lily passage 5 11, and that opens into the venturi passage 5 11 1 and forms a valve chamber 5 12 into which the biston valve 5 05 is inserted. Section 5 13 is provided.
- the valve body 504 extends vertically downward from the ventilating passage 511 so as to be coaxial with the cylinder portion 5113, and a jet valve 516 described later provided in the piston valve 505.
- the cap body 504 is provided with a fuel introduction part 515 which is integrated with the fuel introduction passage 514 and extends into the chamber 503.
- a substantially oval bottomed tubular biston valve 505 is provided in a valve chamber 512 formed in the cylinder section 513 in a direction perpendicular to the direction of intake air flowing through the venturi passage 511. Is inserted into.
- the screw valve 505 is slidable with respect to the cylinder portion 513, and is held by the cylinder portion 513 so that the vertical movement axis does not shift.
- This piston valve 505 changes the passage area of the bench lily passage 511 by moving up and down within the valve chamber 511, and adjusts the amount of intake air flowing through the venturi passage 511.
- a bottomed cylindrical lid 506 having a shape corresponding to the cylinder part 5 13 is attached, and a valve chamber 5 formed in the cylinder part 5 13 is formed. 1 and 2 are closed.
- a spring 507 is provided between the lid 506 and the biston valve 505. The panel 507 urges the piston valve 505 in a direction to close the venturi passage 511.
- An engagement portion 513a for restricting the movement of the biston valve 505 in the closing direction is formed at the upper end opening of the cylinder portion 513.
- a collar portion 505a is formed at the upper end opening of the biston valve 505.
- a jet needle 5 16 is provided outside the bottom surface of the piston valve 505.
- the jet dollar 5 16 is inserted into a fuel introduction passage 5 14 formed vertically downward with respect to the bench lily passage 5 11, and moves up and down with the biston valve 5 05 .
- Such a jet dollar 516 adjusts the amount of fuel sucked into the bench lily passage 511 from the chamber 503.
- a throttle cable (not shown) is locked at the bottom of the above-mentioned biston valve 505, and this slot cable is extended. The ends are connected to the excel grip.
- the operation of the accelerator grip causes the piston valve 505 to move in the vertical direction, thereby changing the area of the venturi passage 511 from fully closed to fully open.
- the amount of fuel sucked into the bench lily passage 5 1 1 is adjusted.
- fuel can be mixed with the intake air and supplied to the engine, and the rotation speed of the engine can be changed.
- the intake air in which a predetermined amount of fuel is mixed can be supplied to the engine in a state where the biston valve 505 is at the idling opening.
- the carburetor 501 configured as described above is provided with an opening detector that detects the opening of the biston valve 505.
- the opening degree detecting unit is separated from the first magnet 521, which is embedded in the lower edge of the biston valve 505, by at least a movable distance of the piston valve 5 from the first magnet 521.
- the second magnet 522 embedded in the position, the magnetic sensor 523 provided on the outer surface of the partition wall of the cylinder portion 513, the detection signal of the magnetic sensor 523 is acquired, and the electric processing is performed.
- a detection circuit 5 2 4.
- the distance between the position of the piston valve 505 at the idling opening and the position of the biston valve 505 at the opening at which the bench lily passage 5 11 is most opened that is, the piston valve 5
- the movable distance of the vertical movement of 05 is called the maximum opening length L.
- the first and second magnets 52 1 and 52 2 are permanent magnets made of, for example, barium ferrite and having a surface magnetic flux density of about 100 G. Note that these first and second magnets 52 1, 52 2 are not limited to those made of norylferrite, but may be made of sintered magnets such as SmCo, or permanent magnets such as plastic and rubber. Or an electromagnet or the like may be used. For example, if an electromagnet is used, it is possible to eliminate variations in the generated magnetic field as seen in a permanent magnet.
- the first magnet 5 2 1 is a lower edge of the bistone valve 5 05, PT 8
- the bench lily passage 5 1 1 is arranged in a direction perpendicular to the direction a of the intake air flowing into the passage.
- the magnet 521 moves in parallel with the central axis of the piston valve 505 with the movement of the piston valve 505.
- the second magnet 522 is disposed at the edge of the vertically upward button valve 505 at a distance of not less than the maximum opening length L from the first magnet 521.
- the second magnet 522 also moves in parallel with the central axis of the biston valve 505 in the same manner as the first magnet 521, with the movement of the biston valve 505.
- first magnet 52 1 and the second magnet 52 2 are arranged such that their movement trajectory is parallel to the central axis of the biston valve 505 and their extension lines overlap each other. . Then, the straight line connecting the first magnet 52 1 and the second magnet 52 2 is arranged to be perpendicular to the direction a of the intake air.
- the first magnet 52 1 and the second magnet 52 2 are provided so as to generate a magnetic field perpendicular to the moving direction of the biston valve 500 5, respectively. It is magnetized to generate magnetic fields in opposite directions.
- the magnetic sensor 52 3 detects the strength of a magnetic field in a predetermined direction given by the first magnet 52 1 and the second magnet 52 2 and detects the detected magnetic field. 98
- the magnetic sensor 523 is composed of, for example, a magnetoresistive (MR) element, a Hall element, and the like.
- the magnetic sensor 52 3 is provided on the outer surface side of the cylinder portion 5 13 with a partition wall interposed between the first magnet 52 1 and the second magnet 52 2 provided in the biston valve 500. It is arranged on a straight line connecting the straight line connecting the first magnet 52 1 and the second magnet 52 2 and the central axis of the biston valve 505. Further, the magnetic sensor 52 3 is set at a position lower than the position of the second magnet 52 2 when the piston valve 505 is at the idling opening, and the piston valve 505 is set on the bench unit. When the passage 511 is at the most open position, it is arranged as a position higher than the position of the first magnet 521.
- Such a magnetic sensor 52 3 detects the strength of the magnetic field given by the first magnet 52 1 and the second magnet 52 2 when the opening of the piston valve 505 changes. Then, a signal corresponding to the strength of the magnetic field is supplied to the detection circuit 524.
- the detection circuit 524 includes a circuit for driving the magnetic sensor 523 and a circuit for detecting a signal output from the magnetic sensor 523.
- the detection circuit 524 supplies the signal detected by the magnetic sensor 523 to, for example, a control circuit that controls the ignition timing of the engine.
- the magnetic sensor 52 3 detects the magnetic field given from the first magnet 52 1 and the second magnet 52 2 provided in the piston valve 505, The opening of the biston valve 505 can be detected. Also, on a straight line parallel to the straight line connecting the first magnet 52 1 and the second magnet 52 2, the change in the strength of the magnetic field in a predetermined direction is linear. Magnetic sensor 5 2 3 makes it possible to linearly detect the engagement of the piston valve 505.
- the magnetic sensor 523 is wound around a rectangular annular core 531 forming a closed magnetic circuit and two opposite sides of the core 531 in the longitudinal direction. It is composed of coils 532 and 533 and a bobbin 534 that serves as a guide for the coils 532 and 533.
- the core 531 as shown in Figure 56B, has a square shape with an outer dimension of 5.0 mm x 2.0 mm, an inner dimension of 2.0 mm x 1.0 mm, and a thickness of 50 m. It is formed in an annular shape.
- the core 531 is made by, for example, using permalloy and etching it into the above-described shape, followed by heat treatment.
- the magnetic sensor 52 3 has a core 531, a nylon bobbin 534 attached to the core 531, and a 0.06 mm Cu on two parallel sides in the longitudinal direction having an outer dimension of 5.0 mm.
- the wire is formed by winding 50 times on both sides.
- this magnetic sensor 523 is covered with an aluminum case of 2 mm ⁇ 5 mm ⁇ 12 mm for protection and to determine the direction, and is sealed with epoxy resin.
- the high-frequency pulse current I flows through the coils 532 and 533 wound around the core 531 so that magnetic fields are generated in mutually opposite directions.
- Such a magnetic sensor 5 23 has, for example, a very high sensitivity to an external magnetic field incident on the core 531 in the longitudinal direction (the X direction shown in FIG. 56B) with a high-frequency pulse current.
- the impedance changes greatly with respect to the external magnetic field.
- the core 5 3 1 is formed in a ring shape and two coils are wound, so that the differential output is reduced. By doing so, noise can be electrically canceled.
- the detection circuit 524 including the oscillation circuit section and the detection circuit section having the configuration shown in FIGS. Can be.
- the first and second magnets 52 1 and 52 2 were magnetized in the directions indicated by arrows in FIG. It is a rectangular parallelepiped of mm.
- the magnetic sensor 52 3 and the first and second magnets 52 1 and 52 2 as described above are arranged on a vaporizer 501 as shown in FIGS. 58 and 59.
- the first magnet 52 1 and the second magnet 52 2 The distance D) is set to 50 mm and placed on the side of this piston valve 505. At this time, the magnetizing directions are arranged parallel to the magnetic sensing direction of the magnetic sensor 523 and opposite to each other. The first magnet 52 1 and the second magnet 52 2 are inserted into the inside of the piston valve 505 from the side, for example, and bonded with a resin or the like.
- the magnetic sensor 523 is arranged on the outer surface of the cylinder portion 513 of the cap body 504 so as to face a straight line connecting the first magnet 521 and the second magnet 522.
- the magnetic sensor 52 3 is arranged at a position 10 mm below the position where the second magnet 52 2 is arranged when the piston valve 500 is at the idling opening. .
- the magnetic sensor 52 3 has a width 2.2 such that a clearance 1 between the first and second magnets 52 1 and 52 2 is, for example, 10 mm. Make a groove of mmx length 5.2 mm x depth 5 mm on the outer surface of the cylinder part 5 13 and insert it into this groove.
- the magnetic sensor 52 3 maximizes the sensitivity to the magnets 52 1 and 52 2 as shown in FIG. 59, so that the direction of the magnetic field generated by the coils 53 2 and 53 3 They are arranged so that the magnetization directions of 52 1 and 52 2 are parallel to each other. Further, the magnetic sensor 523 is arranged so that the same amount of magnetic flux flows into the two coils 532, 533 in the width direction (y direction shown in FIG. 56B) and the valve. Arrange vertically with the moving direction.
- the magnetic sensor 52 23 has a maximum opening length L When the magnet moves up and down within the range of, the portion of 10 mm from both magnets is not detected as an invalid portion, but the magnetic field of 30 mm at the center is detected.
- the clearance 1 between the magnetic sensor 52 3 and the first and second magnets 52 1, 52 2 depends on the structure of the vaporizer 501 to be mounted and the structure and positional relationship of the biston valve 505. It is determined accordingly. Therefore, the distance D between the magnetic poles is determined based on the clearance 1, the sensitivity of the magnetic sensor 52, and the magnetic field strength of the first and second magnets 521, 522. If the distance D between the magnetic poles is set to be equal to or longer than the maximum aperture length L in consideration of the ineffective portion of the magnetic field near the magnet, good sensitivity can be obtained.
- FIG. 60 shows an output characteristic diagram of the magnetic sensor 523 when the biston valve 505 moves within the range of the maximum opening length L. As shown in the characteristic diagram, the output of the magnetic sensor 523 linearly increases and decreases as the piston valve 505 moves. Therefore, this vaporizer 5 0 1 By detecting the output signal of the magnetic sensor 523, the opening of the biston valve 505 can be linearly detected.
- a coil-type magnetic sensor 52 3 driven by a high-frequency pulse and whose impedance changes with respect to an external magnetic field is used.
- the effect (Ml) element may be used as a magnetic sensor.
- the Ml element is made of an amorphous alloy made of Fe, Si, Co, B, or the like, and has a substantially wire shape as shown in FIG. 53 described above.
- an impedance change occurs with respect to an external magnetic field incident in the longitudinal direction.
- the magnetic sensor using this MI element can drive and detect signals using the detection circuit 524 composed of the oscillation circuit section and the detection circuit section having the configurations shown in FIGS. 10 and 36 described above. it can.
- the magnetic sensor 52 3 using such an Ml element is inexpensive and has good characteristics, it is possible to detect the opening degree of the biston valve 505 with high accuracy and to reduce the cost. it can.
- FIG. 61A and FIG. 61B show the arrangement relationship when the magnetic displacement detection device according to the present invention including the magnetic sensor 523 using the MI element is applied to the vaporizer 501.
- the ignition timing of the gin can be controlled accurately, and the engine output and fuel efficiency can be improved. Further, in the vaporizer 501, since the opening degree of the piston valve 505 is linearly detected, there is no need for a mechanism for adjusting the arrangement of the magnetic sensor 523 or fine adjustment in the manufacturing process. Further, the magnetic sensor 523 and its detection circuit 524 do not increase in size.
- FIG. 62 shows a side view of a vaporizer to which the present invention is applied
- FIG. 63 shows a cross-sectional view of the vaporizer shown in FIG. 62 taken along the line YY ′.
- the magnet 542 is replaced with the magnet 542 in place of the first magnet 521 and the second magnet 522. It is provided on the side of this piston valve 505.
- the magnet 542 is made of ferrite rubber or the like, and has a substantially plate-like shape having a 50 mm ⁇ 9 mm main surface 543, for example. ing.
- the magnet 542 is magnetized perpendicular to the main surface 543, and has magnetized surfaces 544a and 544b of opposite polarities.
- the boundary between the magnetized surface 544a and the magnetized surface 544b is divided by a straight line, and forms a boundary line m.
- the boundary line m intersects with the longitudinal center line n of the main surface 543 (hereinafter simply referred to as the center line n) at the center o of the main surface 543.
- the intersection angle 0 is, for example, 2 °.
- the magnet 542 is disposed on the side surface of the biston valve 505 with the center line n parallel to the central axis of the piston valve 505.
- the maximum opening length L of the piston valve 505 is 30 mm, for example, when the piston valve 505 is at the idling opening, the upper end of the magnet 542 has an upper end. It is arranged so as to be located at a position 10 mm above the magnetic sensor 52 3.
- the magnetic sensor 523 disables the magnetic field of the upper and lower 10 mm portions It does not detect it as a part, but detects a magnetic field of 30 mm in the central part.
- the direction of the magnetic field generation by the coils 532 and 533 and the magnetization of the magnet 542 are set as shown in FIG. 65C. Arrange them so that the directions are parallel.
- FIG. 66 shows an output characteristic diagram of the magnetic sensor 523 when the piston valve 505 of the vaporizer 541 moves within the range of the maximum opening length L.
- the output of the magnetic sensor 523 linearly increases and decreases with the movement of the piston valve 505. Therefore, in this carburetor 541, the output of the magnetic sensor 523 is connected to the piston valve. It can be detected as a signal indicating the opening degree of 505.
- the opening degree of the piston valve 505 can be detected with higher accuracy.
- the use of the magnet 542 makes it possible to use a portion where the magnetic field change becomes steep, so that the opening degree of the piston valve 505 can be detected with higher accuracy.
- the magnetic field provided by the magnet 542 is detected by the magnetic sensor 523, so that the degree of the piston valve 505 is determined by the degree of the piston valve 505. Detection can be performed continuously (preferably linearly) and accurately over the entire area of the movement range. Therefore, in the carburetor 541, the ignition timing of the engine can be accurately controlled, and the output and fuel efficiency of the engine can be improved.
- the opening degree of the piston valve 505 is detected in a straight line, so that there is no need for an adjustment mechanism for the arrangement of the magnetic sensor 523 or fine adjustment in the manufacturing process. Further, the size of the magnetic sensor 5 2 3 detection circuit 5 2 4 does not increase.
- the moving direction of the valve is not limited to the up and down movement and is not limited.
- the moving direction of the pulp may be a left-right direction or the like.
- the intersection angle 6> between the boundary line m between the two magnetized surfaces 5 4 4 a and 5 4 4 b of the magnet 5 4 2 and the center line n is not particularly limited, and the maximum opening length L And the clearance 1 of the magnetic sensor 523 or the shape of the magnetic sensor 523 varies.
- the intersection angle 0 takes a value such as 0 ° ⁇ 0 ⁇ 10 °.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53183598A JP4367966B2 (ja) | 1997-01-28 | 1998-01-27 | 磁気式変位検出装置 |
EP98900752A EP0896205A1 (en) | 1997-01-28 | 1998-01-27 | Magnetic displacement detector and carburetor opening detector |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1390697 | 1997-01-28 | ||
JP9/13905 | 1997-01-28 | ||
JP1390597 | 1997-01-28 | ||
JP9/13906 | 1997-01-28 | ||
JP8101697 | 1997-03-31 | ||
JP9/81016 | 1997-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998033041A1 true WO1998033041A1 (fr) | 1998-07-30 |
Family
ID=27280445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/000318 WO1998033041A1 (fr) | 1997-01-28 | 1998-01-27 | Detecteur de deplacement magnetique et detecteur d'ouverture de carburateur |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0896205A1 (ja) |
JP (1) | JP4367966B2 (ja) |
WO (1) | WO1998033041A1 (ja) |
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JP2005161035A (ja) * | 2003-11-13 | 2005-06-23 | Oculus Optikgeraete Gmbh | 人間の眼の検査を行うための装置 |
JP2008241369A (ja) * | 2007-03-26 | 2008-10-09 | Tdk Corp | 磁石構造体及びこれを用いた位置検出装置 |
JP2008241370A (ja) * | 2007-03-26 | 2008-10-09 | Tdk Corp | 磁石構造体及びこれを用いた位置検出装置 |
CN102620641A (zh) * | 2012-03-30 | 2012-08-01 | 刘延风 | 一种轴向位移传感器 |
JP2013024779A (ja) * | 2011-07-22 | 2013-02-04 | Murata Mach Ltd | 磁気式変位センサと変位検出方法 |
CN104748661A (zh) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | 差动变压器式位移传感器 |
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DE19812271B4 (de) * | 1998-03-20 | 2013-08-01 | Deere & Company | Einrichtung zum Überwachen des Abstandes zwischen einem Messer einer rotierenden Schneidtrommel und einer Gegenschneide einer Erntemaschine |
JP2001280908A (ja) * | 2000-03-29 | 2001-10-10 | Sony Precision Technology Inc | 位置検出装置 |
GB2391315A (en) * | 2002-07-26 | 2004-02-04 | Innovision Res & Tech Plc | Detection apparatus and detectable component |
WO2005085763A2 (en) * | 2004-03-01 | 2005-09-15 | Scientific Generics Limited | Position sensor |
EP2265901B1 (en) | 2008-03-19 | 2016-06-08 | Sagentia Limited | Processing circuitry |
CN102607392A (zh) * | 2012-03-13 | 2012-07-25 | 中天启明石油技术有限公司 | 一种测量井间距离和方位的方法及系统 |
EP2789985A1 (en) * | 2013-04-10 | 2014-10-15 | Tyco Electronics AMP GmbH | Contactless position sensor and contactless position sensor system |
CN103994712B (zh) * | 2014-04-28 | 2016-09-14 | 安徽华盛科技控股股份有限公司 | 无源直线位移传感器 |
JP6352195B2 (ja) * | 2015-01-14 | 2018-07-04 | Tdk株式会社 | 磁気センサ |
KR102425750B1 (ko) | 2020-10-28 | 2022-07-28 | 삼성전기주식회사 | 차동 센싱 구조를 갖는 위치 센싱 회로 및 위치 제어 장치 |
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JPH05197922A (ja) * | 1992-01-20 | 1993-08-06 | Fujitsu Ltd | 一体型薄膜ヘッド |
JPH0579403U (ja) * | 1992-03-27 | 1993-10-29 | 株式会社鷺宮製作所 | てこ式ダイヤルゲージ |
JPH07317571A (ja) * | 1994-05-27 | 1995-12-05 | Yamaha Motor Co Ltd | 気化器の開度検出装置 |
Cited By (6)
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JP2005161035A (ja) * | 2003-11-13 | 2005-06-23 | Oculus Optikgeraete Gmbh | 人間の眼の検査を行うための装置 |
JP2008241369A (ja) * | 2007-03-26 | 2008-10-09 | Tdk Corp | 磁石構造体及びこれを用いた位置検出装置 |
JP2008241370A (ja) * | 2007-03-26 | 2008-10-09 | Tdk Corp | 磁石構造体及びこれを用いた位置検出装置 |
JP2013024779A (ja) * | 2011-07-22 | 2013-02-04 | Murata Mach Ltd | 磁気式変位センサと変位検出方法 |
CN102620641A (zh) * | 2012-03-30 | 2012-08-01 | 刘延风 | 一种轴向位移传感器 |
CN104748661A (zh) * | 2015-04-17 | 2015-07-01 | 兰州理工大学 | 差动变压器式位移传感器 |
Also Published As
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EP0896205A1 (en) | 1999-02-10 |
JP4367966B2 (ja) | 2009-11-18 |
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