WO2015056689A1 - Position detection sensor, and throttle device for internal combustion engine - Google Patents
Position detection sensor, and throttle device for internal combustion engine Download PDFInfo
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- WO2015056689A1 WO2015056689A1 PCT/JP2014/077381 JP2014077381W WO2015056689A1 WO 2015056689 A1 WO2015056689 A1 WO 2015056689A1 JP 2014077381 W JP2014077381 W JP 2014077381W WO 2015056689 A1 WO2015056689 A1 WO 2015056689A1
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- coil
- detection sensor
- magnetic path
- rotation angle
- detection
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/106—Detection of demand or actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1035—Details of the valve housing
- F02D9/105—Details of the valve housing having a throttle position sensor
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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
- G01D5/204—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 mutual induction between two or more coils
- G01D5/2066—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 mutual induction between two or more coils by movement of a single coil with respect to a single other coil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0404—Throttle position
Definitions
- the present invention relates to a position detection sensor, and more particularly to a sensor for detecting the position or rotation angle of various members.
- a Hall sensor applies a magnetic field horizontal to the surface of a sensor chip provided with a magnetoelectric conversion element by a permanent magnet, and detects an absolute angle around the rotation axis of the permanent magnet (for example, Patent Document 1).
- the resolver has a stator and a rotor, and detects according to the rotation angle of the rotor with respect to the stator by utilizing the fact that the mutual inductance between the stator and the rotor changes depending on the rotation position of the rotor with respect to the stator.
- a signal is output (for example, Patent Document 2).
- MR sensors, optical encoders, potentiometers, and the like are also known.
- a sensor suitable for the application is selected in consideration of factors such as detection accuracy, reliability, and cost.
- the rotation angle of the throttle valve (ThrottlealValve) Hall sensors and potentiometers are mainly applied to the sensors to be detected.
- the FI system can control the air-fuel ratio with high accuracy, it is combined with the exhaust gas purification effect due to the synergistic effect with the catalyst, leading to the introduction to automobiles and large motorcycles, and then a small two-wheeled vehicle including a motorbike.
- the application of the FI system is also progressing.
- small motorcycles have lower vehicle prices than automobiles and large / medium-sized motorcycles, it is necessary to reduce the cost of the FI system even if environmental effectiveness is considered.
- a motor-equipped bicycle is an application target, there is a great demand for cost reduction.
- the Hall sensor and potentiometer are lower in cost than the MR sensor and optical encoder, but are even lower in cost when a small motorcycle is assumed. Is required.
- the present invention has been made based on such a background, and an object thereof is to provide a detection sensor that can realize cost reduction. It is another object of the present invention to provide a throttle device for an internal combustion engine having such a detection sensor.
- the position detection sensor includes an excitation coil in which a magnetic path is formed on the inner side and the periphery around which an electric wire is wound, the magnetic path narrows from one end to the other end, and one end And a detection coil that is inserted into the magnetic path from either one of the other ends and supported so that the movement path in the magnetic path can advance and retreat, and an induced electromotive force is generated by receiving a magnetic field formed by the excitation coil. It is characterized by that.
- the magnetic path of the exciting coil becomes narrower from one end to the other end, the strength of the magnetic field formed when current is supplied to the exciting coil increases from one end to the other end. Become.
- the induced electromotive force generated in the detection coil moving along the magnetic path fluctuates according to the width of the magnetic path, that is, the position. Therefore, if the induced electromotive force is detected, the position of the detection coil when it is detected is specified. can do. Since the position detection sensor of the present invention is mainly composed of a coil that is produced by winding an electric wire, the cost can be extremely reduced.
- the position detection sensor of the present invention is used by connecting a position detection target separately present in the detection coil, but can be applied to both a detection target that reciprocates linearly and a detection target that rotates.
- the magnetic path is formed linearly from one end to the other end, and the position of the detection coil that moves forward and backward along the linear movement path is detected. If it does so, the position of the detection target which carries out a reciprocating linear motion can be specified, and also a movement distance can also be calculated.
- the magnetic path is formed in an arc shape from one end to the other end, and the position of the detection coil that moves back and forth along the arc-shaped moving path is detected. By doing so, it is possible to specify the position of the detection target that rotates, that is, the rotation angle.
- the present invention also includes a throttle valve that controls the supply amount of the air-fuel mixture in the internal combustion engine, and a position sensor that detects the opening of the throttle valve as a rotation angle, and the position sensor is any one of the above detection sensors.
- a throttle device for an internal combustion engine is also provided.
- the excitation coil and the detection coil are the main constituent elements, a detection sensor capable of reducing the cost is provided.
- the position detection sensor 1 includes a coil 10 including a detection coil 12, an excitation coil 20 including a magnetic path 25 in which the coil 10 advances and retreats, and an induced electromotive force acquired by the coil 10.
- a detector 30 that detects the position of the coil 10 inside the exciting coil 20 from V is provided as a constituent element.
- a detection target is connected to the position detection sensor 1, and the position P ′ of the detection target is specified by the position detection sensor 1.
- each element of the position detection sensor 1 will be described in order.
- the coil 10 includes a holder 11 made of resin and a detection coil 12 disposed inside the holder 11.
- the holder 11 is connected to a detection target (not shown) at the rear. Therefore, the holder 11 advances and retreats in the magnetic path 25 of the exciting coil 20 following the linear motion of the detection target.
- the detection coil 12 is formed of an electric wire, and a detection portion 12a is formed at the tip. Note that both ends of the lead wire are connected to the detector 30.
- the coil 10 is allowed to move in a range from the reference position shown in FIG. 1 to the maximum movement position shown in FIG. 2 (b) after passing the intermediate position shown in FIG. 2 (a). .
- the exciting coil 20 includes a winding 21 formed by winding an electric wire, and a bobbin 23 that holds the winding 21 from the inside.
- a magnetic path 25 is formed inside the bobbin 23.
- the exciting coil 20 has a circular cross section, and a linear magnetic path 25 is formed by forming a bobbin 23 corresponding to the shape of the coil 10.
- the bobbin 23 is formed so that the inner diameter gradually decreases toward the tip. Therefore, the magnetic path 25 to be formed is formed so that the width becomes narrower toward the tip.
- Both ends of the winding 21 are connected to a power source 27, and an alternating current is applied from the power source 27.
- the change in the magnetic flux passing through the detection unit 12a per unit time per unit time is more in the detection unit 12a at the position P2 than in the case of the position P1. large.
- the induced electromotive force V is proportional to the change per unit time of the magnetic flux ⁇ penetrating the detection unit 12a. Therefore, the induced electromotive force V2 generated in the detection unit 12a at the position P2 is larger than the induced electromotive force V1 generated at the position P1 (V2> V1). That is, the induced electromotive force V generated increases as the detection unit 12a enters toward the tip of the exciting coil 20.
- the detector 30 continuously detects the induced electromotive force V of the detection coil 12, and further detects the position P of the coil 10 in the exciting coil 20 corresponding to the detected induced electromotive force V. Then, based on the position P of the coil 10, the position of the inspection object is specified.
- the position detection sensor 1 can specify the position P ′ to be detected by two types of specifying methods.
- the position P ′ to be detected can be specified by any one method, and can also be specified by using two methods in combination.
- the first method is to specify the position P ′ of the detection target by specifying the position of the coil 10 based on the correlation data regarding the change of the induced electromotive force V with respect to the position P of the coil 10 in the magnetic path 25.
- the detector 30 holds correlation data regarding the change in the induced electromotive force V with respect to the position P of the coil 10.
- the correlation data can be obtained by using the position detection sensor 1 and measuring the induced electromotive force V corresponding to the predetermined position P of the coil 10.
- FIG. 4A shows an example of the correlation data as a diagram, but the detector 30 can hold data as a table format or can also hold it as a function. Further, in the correlation data in FIG.
- the position P and the induced electromotive force V are in a proportional relationship, but this is merely an example.
- the position detection sensor 1 specifies the position P of the coil 10 from the correlation data. Further, the detector 30 holds correlation data regarding the correlation between the position P ′ of the detection target and the position P of the coil 10 in the exciting coil 20. Based on the correlation data, the position P ′ to be detected is specified from the specified position P of the coil 10.
- the second is a method of specifying the position of the coil 10 and specifying the position P ′ to be detected based on the correlation data regarding the change in the voltage ratio R with respect to the position P of the coil 10 in the magnetic path 25.
- the voltage ratio R refers to the ratio of the voltage of the coil 10 to the voltage of the exciting coil 20.
- a constant voltage is applied to the exciting coil 20 by a power source 27. Therefore, the voltage ratio R at a predetermined position of the coil 10 does not change.
- the power supply 27 transmits the voltage applied to the excitation coil 20 to the detector 30.
- the detector 30 detects the induced electromotive force V of the detection coil 12.
- the detector 30 detects both the voltage applied to the exciting coil 20 and the induced electromotive force V of the coil 10, and calculates the voltage ratio R. Further, the detector 30 holds correlation data regarding the voltage ratio R with respect to the position P of the coil 10 (FIG. 4A) and correlation data regarding the position P ′ of the detection target with respect to the position P of the coil 10. In this correlation data, the position P and the voltage ratio R are in a proportional relationship, but this is merely an example. The detector 30 specifies the position P of the coil 10 based on the correlation data from the calculated voltage ratio. Then, the position P ′ to be detected is specified based on the correlation data from the specified position P of the coil 10.
- the target position P ′ can be specified.
- the position detection sensor 1 described so far is targeted for a detection object that moves linearly, but can also be used as a rotation angle detection sensor that detects the rotation angle ⁇ when the detection object rotates.
- a motion conversion mechanism is interposed between the holder 11 and the detection target.
- the motion conversion mechanism is a mechanism that converts rotational motion into linear motion, and for example, a rack and pinion mechanism can be adopted.
- the detection target rotates
- the holder 11 moves linearly by the motion conversion mechanism. Therefore, the coil 10 advances and retreats inside the magnetic path 25.
- an induced electromotive force V is generated in the detection coil 12, and the induced electromotive force V is detected by the detector 30.
- the detector 30 correlates the change in the induced electromotive force V with respect to the rotation angle ⁇ obtained from the correlation data regarding the induced electromotive force V with respect to the position P of the coil 10 and the correlation data with respect to the rotation angle ⁇ with respect to the position P of the coil 10. Retain data.
- the detector 30 can specify the rotation angle ⁇ from the position P of the coil 10.
- the rotation angle detection sensor 2 can detect the rotation angle ⁇ also by the voltage ratio R. In this case, the detector 30 holds data regarding the rotation angle ⁇ with respect to the voltage ratio R, and identifies the rotation angle ⁇ from the calculated voltage ratio R.
- a known circuit or device that can detect the induced electromotive force V can be applied to the detector 30 regardless of the specific configuration of the detector 30.
- the present invention aims to detect the position P ′ or the rotation angle ⁇ of the detection target at low cost, it is desirable that the detector 30 be configured to meet this purpose.
- the detector 30 can be implemented by an inexpensive one-chip microcomputer. Can be configured.
- the rotation angle detection sensor 2 in which the coil 50 advances and retreats in an arc shape will be described.
- the rotation angle detection sensor 2 according to the present embodiment includes a coil 50 including a holder 51 formed in a sickle shape, and an excitation coil 60 including an arc-shaped magnetic path 65 in which the holder 51 advances and retreats. And a detector 30 that obtains the rotation angle ⁇ from the induced electromotive force V acquired from the coil 50, as a constituent element.
- each component of the rotation angle detection sensor 2 will be described in order.
- the rotation angle detection sensor 2 can specify the position P ′ to be detected by two types of specifying methods.
- the position P ′ to be detected can be specified by any one method, and can also be specified by using two methods in combination.
- the coil 50 is a member supported so as to be capable of normal rotation and reverse rotation, that is, swinging movement about the rotation shaft 55, and is provided inside the holder 51, which is supported by the rotation shaft 55. And a detection coil 52.
- the holder 51 is made of resin, and is a sickle-like member in plan view.
- the holder 51 includes an arcuate insertion portion 53 and a linear swinging portion 54.
- the insertion portion 53 moves back and forth inside the magnetic path 65 of the exciting coil 60.
- a detection coil 52 is provided inside the insertion portion 53.
- the detection coil 52 is formed along the shape of the insertion portion 53, and a detection portion 52a is formed at the tip. Both ends of the lead wire of the detection coil 52 are connected to the detector 30.
- the detection coil 52 moves back and forth in the magnetic path 65 generating the magnetic flux ⁇ , thereby generating an induced electromotive force V.
- the change in the induced electromotive force is converted by the detector 30 to identify the rotation angle ⁇ of the coil 50 according to the detected induced electromotive force V.
- the outer peripheral edge 51a and the inner peripheral edge 51b of the holder 51 do not have to have an arc shape with a single curvature.
- the outer peripheral edge 51a and the inner peripheral edge 51b may be formed by connecting straight lines or curved lines.
- the arc-shaped magnetic path 65 can function in the present embodiment as long as it can advance and retract without interfering with the exciting coil 60.
- the holder 51 has a central angle ⁇ of 90 degrees. This center angle ⁇ is set corresponding to the case where the rotation angle of the detection target of the rotation angle detection sensor 2 is 90 degrees or less. Therefore, when the rotation angle of the detection target exceeds 90 degrees, the center angle ⁇ of the holder 51 is set to an angle corresponding to the rotation angle.
- the holder 51 in which the insertion portion 53 and the swinging portion 54 are integrated can be manufactured by, for example, injection molding.
- the holder 51 can also be manufactured by manufacturing the part of the rocking
- the coil 50 of the present embodiment supports the rear end 51d of the insertion portion 53 with the swinging portion 54, almost the entire range from the rear end 51d, which is a support portion, to the front end 51c can advance and retract the magnetic path 65. . Therefore, according to the present embodiment, the region of the insertion portion 53 that does not advance or retract the magnetic path 65 can be eliminated, which is a factor contributing to downsizing of the rotation angle detection sensor 2.
- the rotary shaft 55 is rotated in synchronism with the operation of the rotary shafts (hereinafter referred to as “drive shafts”) of various machine elements that are rotationally driven.
- the driving shaft can be extended to function as the rotating shaft 55, or the rotating shaft 55 can be connected directly or indirectly to the driving shaft.
- indirectly connecting it is assumed that a reduction gear or a speed increaser is interposed.
- the exciting coil 60 includes a winding 61 formed by winding an electric wire, and a bobbin 63 that holds the winding 61 from the inside.
- a magnetic path 65 is formed inside the bobbin 63.
- the exciting coil 60 forms a magnetic path 65 in an arc shape by forming a bobbin 63 corresponding to the shape of the holder 51 of the coil 50.
- the arc shape is intended to include a taper like the magnetic path 65 even if the center line is an arc shape.
- the exciting coil 60 has a circular cross section and is formed so that the inner diameter decreases toward the tip. Therefore, the magnetic path 65 is formed so as to narrow toward the tip.
- the central angle ⁇ of the exciting coil 60 is 90 degrees that matches the central angle ⁇ of the holder 51, but is set corresponding to the central angle ⁇ of the holder 51.
- the exciting coil 60 has a magnetic path 65 that narrows toward the tip. Therefore, more magnetic flux ⁇ penetrates the detection unit 52a at the position P4 than at the position P3. For this reason, the magnetic flux density increases as the position from the reference position to the tip of the exciting coil 60 increases. Therefore, the induced electromotive force V4 generated in the detection unit 52a at the position P4 is larger than the induced electromotive force V3 generated at the position P3 (V4> V3). That is, the induced electromotive force V generated increases as the detection unit 52a enters toward the tip of the exciting coil 60.
- the detector 30 in the present embodiment holds correlation data regarding the change in the induced electromotive force V with respect to the rotation angle ⁇ of the coil 50.
- the correlation data is obtained by using the rotation angle detection sensor 2 and the induced electromotive force V corresponding to each rotation angle ⁇ each time the coil 50 is rotated by a predetermined angle, for example, 0 degree, 1 degree, 2 degrees, etc. Can be obtained by measuring (FIG. 4B).
- the rotation angle detection sensor 2 is applied to a detection target of the rotation angle ⁇
- the rotation angle detection sensor 2 corresponds to the induced electromotive force V detected with reference to the correlation data.
- the rotation angle ⁇ is specified.
- the identified rotation angle ⁇ is used for control processing of the detection target.
- the rotation angle detection sensor 2 can also specify the rotation angle ⁇ based on the change of the voltage ratio R with respect to the rotation angle ⁇ of the coil 50 in the magnetic path 65 when applied to the detection target of the rotation angle ⁇ .
- the detector 30 holds correlation data regarding the rotation angle ⁇ with respect to the voltage ratio R. Therefore, the detector 30 can specify the rotation angle ⁇ based on the voltage ratio R.
- FIG. 7 shows an outline of the configuration.
- the rotation angle detection sensor 2 is used to detect the opening degree of the valve body 43.
- the rotation shaft 55 of the coil 50 is connected to the valve shaft 41, and when the valve shaft 41 is driven by the electric actuator 45, the rotation shaft 55 rotates following the valve shaft 41.
- the holder 51 moves back and forth in the magnetic path 65, and the induced electromotive force V of the exciting coil 60 fluctuates.
- the ECU 35 rotates the rotational angle ⁇ of the rotary shaft 55 based on the induced electromotive force V detected. That is, the opening degree of the valve body 43 can be detected.
- the ECU 35 sends a control signal to the electric actuator 45 while referring to the detected opening of the valve body 43.
- the exciting coils 20 and 60 whose diameter decreases toward the tip are used.
- the inner diameter of the coil since the inner diameter of the coil only needs to gradually change toward the tip, the inner diameter increases toward the tip.
- a coil can be applied.
- the excitation coils 20 and 60 are described as having a circular cross-sectional shape.
- the magnetic paths 25 and 65 since the magnetic paths 25 and 65 only need to be gradually narrowed, the cross-section is formed in a rectangular shape. You can also
- the method of specifying the position P ′ or the rotation angle ⁇ of the detection target by detecting the induced electromotive force V has been described.
- the holders 11 and 51 move forward and backward through the magnetic paths 25 and 65.
- the position P ′ or the rotation angle ⁇ of the detection target can also be specified by detecting the inductance.
- the range of rotation angles to be detected is 0 to 90 degrees.
- the present invention can detect rotation angles exceeding 90 degrees.
- the range of the maximum rotation angle that can be detected is 0 to 180 degrees.
- the magnetic path 25 formed inside the winding 21 (bobbin 23) is configured so that the coil 50 advances and retreats.
- the magnetic flux constituting the magnetic path is also generated around the winding 21.
- a magnetic path formed around the detection coil can be configured so that the holder advances and retreats.
- the application of the rotation angle detection sensor according to the present invention is not limited to the detection of the opening degree of the throttle valve of the FI system.
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Abstract
[Problem] To provide a detection sensor whereby cost can be reduced. [Solution] A position detection sensor (1) characterized by being provided with: an excitation coil (20) in which a magnetic path (25) is formed on a periphery and in an inside thereof in which a winding (21) is wound, and the magnetic path (25) narrows from one end toward another end of the excitation coil (20); and a detection coil (12) inserted in the magnetic path (25) from either the one end or the other end and supported so as to be able to advance and retreat along a movement path in the magnetic path (25), an induced electromotive force (V) being generated therein by reception of a magnetic field formed by the excitation coil (20). This position detection sensor (1) has the excitation coil (20) and the detection coil (12) as main constituent elements thereof, and the cost of the position detection sensor (1) can therefore be reduced.
Description
本発明は、位置検出センサに関し、特に種々の部材の位置あるいは回転角度を検出するセンサに関する。
The present invention relates to a position detection sensor, and more particularly to a sensor for detecting the position or rotation angle of various members.
回転角度を検出するのに種々のセンサが使用されている。例えば、ホールセンサは、磁電変換素子が設けられたセンサチップの表面に対して水平な磁場を永久磁石により印加し、永久磁石の回転軸回りの絶対角度を検出する(例えば、特許文献1)。また、レゾルバ(resolvers)は、ステータ及びロータを有し、ステータに対するロータの回転位置によってステータとロータとの間の相互インダクタンスが変化することを利用して、ステータに対するロータの回転角度に応じた検出信号を出力する(例えば、特許文献2)。その他に、MRセンサ、光学式エンコーダ、ポテンショメータ(potentiometer)なども知られている。
* Various sensors are used to detect the rotation angle. For example, a Hall sensor applies a magnetic field horizontal to the surface of a sensor chip provided with a magnetoelectric conversion element by a permanent magnet, and detects an absolute angle around the rotation axis of the permanent magnet (for example, Patent Document 1). The resolver has a stator and a rotor, and detects according to the rotation angle of the rotor with respect to the stator by utilizing the fact that the mutual inductance between the stator and the rotor changes depending on the rotation position of the rotor with respect to the stator. A signal is output (for example, Patent Document 2). In addition, MR sensors, optical encoders, potentiometers, and the like are also known.
回転角度を検出する用途は多枝に亘り、検出精度、信頼性及びコストなどの要素を考慮して、用途に適したセンサが選択される。例えば、自動車(四輪)及び自動二輪車の駆動源である内燃機関に用いられる電子制御燃料噴射装置(Fuel Injection System:フューエルインジェクションシステム(FIシステム))において、スロットルバルブ(Throttle Valve)の回転角度を検出するセンサには、主にホールセンサ、ポテンショメータが適用されている。
¡There are many applications for detecting the rotation angle, and a sensor suitable for the application is selected in consideration of factors such as detection accuracy, reliability, and cost. For example, in an electronically controlled fuel injection system (Fuel Injection System) used in an internal combustion engine that is the driving source of automobiles (four-wheels) and motorcycles, the rotation angle of the throttle valve (ThrottlealValve) Hall sensors and potentiometers are mainly applied to the sensors to be detected.
FIシステムは、高精度な空燃比の制御が可能であることから触媒との相乗効果による排ガス浄化効果と相まって、自動車及び大型二輪車への導入が先行し、その後、原動機付き自転車も含む小型の二輪車についても、FIシステムの適用が進んでいる。しかし、小型二輪車は自動車、大・中型二輪車に比べ車両価格が低いため、環境への有効性を考慮したとしても、FIシステムのコストを下げる必要がある。特に、原動機付き自転車を適用対象とすると、低コスト化の要求は大きい。
FIシステムの構成要素であるスロットルバルブの回転角度を検出するセンサについて言うと、ホールセンサ及びポテンショメータは、MRセンサ及び光学式エンコーダに比べると低コストではあるが、小型二輪車を想定すると、さらなる低コスト化が要求される。
本発明は、このような背景に基づいてなされたもので、低コスト化を実現できる検出センサを提供することを目的とする。
また、本発明はそのような検出センサを備える内燃機関用スロットル装置を提供することを目的とする。 Since the FI system can control the air-fuel ratio with high accuracy, it is combined with the exhaust gas purification effect due to the synergistic effect with the catalyst, leading to the introduction to automobiles and large motorcycles, and then a small two-wheeled vehicle including a motorbike. The application of the FI system is also progressing. However, since small motorcycles have lower vehicle prices than automobiles and large / medium-sized motorcycles, it is necessary to reduce the cost of the FI system even if environmental effectiveness is considered. In particular, when a motor-equipped bicycle is an application target, there is a great demand for cost reduction.
Speaking of the sensor that detects the rotation angle of the throttle valve, which is a component of the FI system, the Hall sensor and potentiometer are lower in cost than the MR sensor and optical encoder, but are even lower in cost when a small motorcycle is assumed. Is required.
The present invention has been made based on such a background, and an object thereof is to provide a detection sensor that can realize cost reduction.
It is another object of the present invention to provide a throttle device for an internal combustion engine having such a detection sensor.
FIシステムの構成要素であるスロットルバルブの回転角度を検出するセンサについて言うと、ホールセンサ及びポテンショメータは、MRセンサ及び光学式エンコーダに比べると低コストではあるが、小型二輪車を想定すると、さらなる低コスト化が要求される。
本発明は、このような背景に基づいてなされたもので、低コスト化を実現できる検出センサを提供することを目的とする。
また、本発明はそのような検出センサを備える内燃機関用スロットル装置を提供することを目的とする。 Since the FI system can control the air-fuel ratio with high accuracy, it is combined with the exhaust gas purification effect due to the synergistic effect with the catalyst, leading to the introduction to automobiles and large motorcycles, and then a small two-wheeled vehicle including a motorbike. The application of the FI system is also progressing. However, since small motorcycles have lower vehicle prices than automobiles and large / medium-sized motorcycles, it is necessary to reduce the cost of the FI system even if environmental effectiveness is considered. In particular, when a motor-equipped bicycle is an application target, there is a great demand for cost reduction.
Speaking of the sensor that detects the rotation angle of the throttle valve, which is a component of the FI system, the Hall sensor and potentiometer are lower in cost than the MR sensor and optical encoder, but are even lower in cost when a small motorcycle is assumed. Is required.
The present invention has been made based on such a background, and an object thereof is to provide a detection sensor that can realize cost reduction.
It is another object of the present invention to provide a throttle device for an internal combustion engine having such a detection sensor.
かかる目的のもと、本発明の位置検出センサは、電線が巻き回される内側及び周囲に磁路が形成される、磁路が一方端から他方端に向けて狭くなる励磁コイルと、一方端及び他方端のいずれか一方から磁路に挿入されるとともに、磁路内の移動経路を進退可能に支持され、励磁コイルが形成する磁場を受けて誘導起電力が生ずる検出コイルと、を備える、ことを特徴とする。
本発明の位置検出センサは、励磁コイルの磁路が一方端から他方端に向けて狭くなるため、励磁コイルに電流を供給すると形成される磁場の強度が、一方端から他方端に向けて大きくなる。したがって、その磁路を移動する検出コイルに生ずる誘導起電力は、磁路の広狭、つまり位置に対応して変動するので、誘導起電力を検出すれば検出されたときの検出コイルの位置を特定することができる。
そして、本発明の位置検出センサは、電線を巻き回して作製されるコイルを主体とするものであるから、極めて低コスト化が可能である。 For this purpose, the position detection sensor according to the present invention includes an excitation coil in which a magnetic path is formed on the inner side and the periphery around which an electric wire is wound, the magnetic path narrows from one end to the other end, and one end And a detection coil that is inserted into the magnetic path from either one of the other ends and supported so that the movement path in the magnetic path can advance and retreat, and an induced electromotive force is generated by receiving a magnetic field formed by the excitation coil. It is characterized by that.
In the position detection sensor of the present invention, since the magnetic path of the exciting coil becomes narrower from one end to the other end, the strength of the magnetic field formed when current is supplied to the exciting coil increases from one end to the other end. Become. Therefore, the induced electromotive force generated in the detection coil moving along the magnetic path fluctuates according to the width of the magnetic path, that is, the position. Therefore, if the induced electromotive force is detected, the position of the detection coil when it is detected is specified. can do.
Since the position detection sensor of the present invention is mainly composed of a coil that is produced by winding an electric wire, the cost can be extremely reduced.
本発明の位置検出センサは、励磁コイルの磁路が一方端から他方端に向けて狭くなるため、励磁コイルに電流を供給すると形成される磁場の強度が、一方端から他方端に向けて大きくなる。したがって、その磁路を移動する検出コイルに生ずる誘導起電力は、磁路の広狭、つまり位置に対応して変動するので、誘導起電力を検出すれば検出されたときの検出コイルの位置を特定することができる。
そして、本発明の位置検出センサは、電線を巻き回して作製されるコイルを主体とするものであるから、極めて低コスト化が可能である。 For this purpose, the position detection sensor according to the present invention includes an excitation coil in which a magnetic path is formed on the inner side and the periphery around which an electric wire is wound, the magnetic path narrows from one end to the other end, and one end And a detection coil that is inserted into the magnetic path from either one of the other ends and supported so that the movement path in the magnetic path can advance and retreat, and an induced electromotive force is generated by receiving a magnetic field formed by the excitation coil. It is characterized by that.
In the position detection sensor of the present invention, since the magnetic path of the exciting coil becomes narrower from one end to the other end, the strength of the magnetic field formed when current is supplied to the exciting coil increases from one end to the other end. Become. Therefore, the induced electromotive force generated in the detection coil moving along the magnetic path fluctuates according to the width of the magnetic path, that is, the position. Therefore, if the induced electromotive force is detected, the position of the detection coil when it is detected is specified. can do.
Since the position detection sensor of the present invention is mainly composed of a coil that is produced by winding an electric wire, the cost can be extremely reduced.
本発明の位置検出センサは、検出コイルに別途存在する位置検出の対象を接続して使用されるが、往復直線運動する検出対象及び回転運動する検出対象の両者に適用することができる。
前者の場合には、磁路を一方端から他方端に向けて直線状に形成し、直線状の移動経路を進退する検出コイルの位置を検出する。そうすれば、往復直線運動する検出対象の位置を特定し、さらには移動距離を求めることもできる。
また、後者の場合は、磁路を一方端から他方端に向けて円弧状に形成し、円弧状の移動経路を進退する検出コイルの位置を検出する。そうすれば、回転運動する検出対象の位置、つまり回転角を特定することができる。 The position detection sensor of the present invention is used by connecting a position detection target separately present in the detection coil, but can be applied to both a detection target that reciprocates linearly and a detection target that rotates.
In the former case, the magnetic path is formed linearly from one end to the other end, and the position of the detection coil that moves forward and backward along the linear movement path is detected. If it does so, the position of the detection target which carries out a reciprocating linear motion can be specified, and also a movement distance can also be calculated.
In the latter case, the magnetic path is formed in an arc shape from one end to the other end, and the position of the detection coil that moves back and forth along the arc-shaped moving path is detected. By doing so, it is possible to specify the position of the detection target that rotates, that is, the rotation angle.
前者の場合には、磁路を一方端から他方端に向けて直線状に形成し、直線状の移動経路を進退する検出コイルの位置を検出する。そうすれば、往復直線運動する検出対象の位置を特定し、さらには移動距離を求めることもできる。
また、後者の場合は、磁路を一方端から他方端に向けて円弧状に形成し、円弧状の移動経路を進退する検出コイルの位置を検出する。そうすれば、回転運動する検出対象の位置、つまり回転角を特定することができる。 The position detection sensor of the present invention is used by connecting a position detection target separately present in the detection coil, but can be applied to both a detection target that reciprocates linearly and a detection target that rotates.
In the former case, the magnetic path is formed linearly from one end to the other end, and the position of the detection coil that moves forward and backward along the linear movement path is detected. If it does so, the position of the detection target which carries out a reciprocating linear motion can be specified, and also a movement distance can also be calculated.
In the latter case, the magnetic path is formed in an arc shape from one end to the other end, and the position of the detection coil that moves back and forth along the arc-shaped moving path is detected. By doing so, it is possible to specify the position of the detection target that rotates, that is, the rotation angle.
また、本発明は、内燃機関において混合気の供給量を制御するスロットルバルブと、スロットルバルブの開度を回転角度として検出する位置センサと、を備え、位置センサは、上記いずれかの検出センサであることを特徴とする内燃機関のスロットル装置をも提供する。
The present invention also includes a throttle valve that controls the supply amount of the air-fuel mixture in the internal combustion engine, and a position sensor that detects the opening of the throttle valve as a rotation angle, and the position sensor is any one of the above detection sensors. A throttle device for an internal combustion engine is also provided.
本発明によれば、励磁コイルと検出コイルを主たる構成要素とするので、低コスト化できる検出センサが提供される。
According to the present invention, since the excitation coil and the detection coil are the main constituent elements, a detection sensor capable of reducing the cost is provided.
[第1実施形態]
以下、添付図面に示す実施形態に基づいてこの発明を詳細に説明する。
本実施形態に係る位置検出センサ1は、図1に示すように、検出コイル12を備えるコイル10と、コイル10が進退する磁路25を備える励磁コイル20と、コイル10が取得した誘導起電力Vから、励磁コイル20の内部におけるコイル10の位置を検出する検出器30と、を構成要素として備える。
この位置検出センサ1には検出対象が接続され、検出対象の位置P’を位置検出センサ1によって特定する。
以下、位置検出センサ1の各要素を順に説明する。 [First Embodiment]
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, theposition detection sensor 1 according to the present embodiment includes a coil 10 including a detection coil 12, an excitation coil 20 including a magnetic path 25 in which the coil 10 advances and retreats, and an induced electromotive force acquired by the coil 10. A detector 30 that detects the position of the coil 10 inside the exciting coil 20 from V is provided as a constituent element.
A detection target is connected to theposition detection sensor 1, and the position P ′ of the detection target is specified by the position detection sensor 1.
Hereinafter, each element of theposition detection sensor 1 will be described in order.
以下、添付図面に示す実施形態に基づいてこの発明を詳細に説明する。
本実施形態に係る位置検出センサ1は、図1に示すように、検出コイル12を備えるコイル10と、コイル10が進退する磁路25を備える励磁コイル20と、コイル10が取得した誘導起電力Vから、励磁コイル20の内部におけるコイル10の位置を検出する検出器30と、を構成要素として備える。
この位置検出センサ1には検出対象が接続され、検出対象の位置P’を位置検出センサ1によって特定する。
以下、位置検出センサ1の各要素を順に説明する。 [First Embodiment]
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, the
A detection target is connected to the
Hereinafter, each element of the
[コイル10]
コイル10は、樹脂からなるホルダ11と、ホルダ11の内部に配置される検出コイル12とを備える。
ホルダ11は、後方で検出対象(図示しない)に接続されている。そのため、ホルダ11は、検出対象の直線運動に追従して、励磁コイル20の磁路25の内部を進退する。
検出コイル12は、電線により形成され、先端には検出部12aが形成されている。
なお、リード線の両端は検出器30に接続されている。
コイル10は図1に示される基準位置から、図2(a)に示される途中の位置を通過して、図2(b)に示される最大移動位置までの範囲で移動が可能とされている。
励磁コイル20に電流が印加された状態で、コイル10が、磁路25の内部を進退すると、電磁誘導により検出部12aに誘導電流が流れ、誘導起電力Vが生じる。生じた誘導起電力Vは検出器30で検出される。 [Coil 10]
Thecoil 10 includes a holder 11 made of resin and a detection coil 12 disposed inside the holder 11.
Theholder 11 is connected to a detection target (not shown) at the rear. Therefore, the holder 11 advances and retreats in the magnetic path 25 of the exciting coil 20 following the linear motion of the detection target.
Thedetection coil 12 is formed of an electric wire, and a detection portion 12a is formed at the tip.
Note that both ends of the lead wire are connected to thedetector 30.
Thecoil 10 is allowed to move in a range from the reference position shown in FIG. 1 to the maximum movement position shown in FIG. 2 (b) after passing the intermediate position shown in FIG. 2 (a). .
When thecoil 10 advances and retreats in the magnetic path 25 in a state where a current is applied to the exciting coil 20, an induced current flows to the detection unit 12a by electromagnetic induction, and an induced electromotive force V is generated. The generated induced electromotive force V is detected by the detector 30.
コイル10は、樹脂からなるホルダ11と、ホルダ11の内部に配置される検出コイル12とを備える。
ホルダ11は、後方で検出対象(図示しない)に接続されている。そのため、ホルダ11は、検出対象の直線運動に追従して、励磁コイル20の磁路25の内部を進退する。
検出コイル12は、電線により形成され、先端には検出部12aが形成されている。
なお、リード線の両端は検出器30に接続されている。
コイル10は図1に示される基準位置から、図2(a)に示される途中の位置を通過して、図2(b)に示される最大移動位置までの範囲で移動が可能とされている。
励磁コイル20に電流が印加された状態で、コイル10が、磁路25の内部を進退すると、電磁誘導により検出部12aに誘導電流が流れ、誘導起電力Vが生じる。生じた誘導起電力Vは検出器30で検出される。 [Coil 10]
The
The
The
Note that both ends of the lead wire are connected to the
The
When the
[励磁コイル20]
励磁コイル20は、電線を巻き回してなる巻線21と、巻線21を内側から保持するボビン23と、を備えており、ボビン23の内部に磁路25が構成される。
励磁コイル20は、横断面が円形をなしており、コイル10の形状に対応してボビン23を形成することで直線的な磁路25が形成されている。
ボビン23は、先端に向けて内径が漸次小さくなるように形成されている。そのため、形成される磁路25は、先端に向けて幅が狭くなるよう形成されている。
巻線21の両端は電源27に接続され、電源27から交流電流が印加される。 [Excitation coil 20]
Theexciting coil 20 includes a winding 21 formed by winding an electric wire, and a bobbin 23 that holds the winding 21 from the inside. A magnetic path 25 is formed inside the bobbin 23.
Theexciting coil 20 has a circular cross section, and a linear magnetic path 25 is formed by forming a bobbin 23 corresponding to the shape of the coil 10.
Thebobbin 23 is formed so that the inner diameter gradually decreases toward the tip. Therefore, the magnetic path 25 to be formed is formed so that the width becomes narrower toward the tip.
Both ends of the winding 21 are connected to apower source 27, and an alternating current is applied from the power source 27.
励磁コイル20は、電線を巻き回してなる巻線21と、巻線21を内側から保持するボビン23と、を備えており、ボビン23の内部に磁路25が構成される。
励磁コイル20は、横断面が円形をなしており、コイル10の形状に対応してボビン23を形成することで直線的な磁路25が形成されている。
ボビン23は、先端に向けて内径が漸次小さくなるように形成されている。そのため、形成される磁路25は、先端に向けて幅が狭くなるよう形成されている。
巻線21の両端は電源27に接続され、電源27から交流電流が印加される。 [Excitation coil 20]
The
The
The
Both ends of the winding 21 are connected to a
ここで、図2(a)の位置(以下、位置P1)、および図2(b)の位置(以下、位置P2)において、検出コイル12にそれぞれ発生する誘導起電力V1,V2について説明する。
電源27から交流電流が印加されると、図3に示すように、励磁コイル20の磁路25の内部に磁束φ(磁場)が生じる。そして、磁路25は先端に向けて狭くなるよう形成されているため、磁束密度は先端に向けて高くなる。
そうすると、位置P2における検出部12aには、位置P1に比べ、より多くの磁束φが貫くこととなる。また、励磁コイル20には交流電流が印加されているため、単位時間当たりに検出部12aを貫く磁束の単位時間当たりの変化も、位置P1の場合よりも、位置P2における検出部12aの方が大きい。
また、誘導起電力Vは,検出部12aを貫く磁束φの単位時間当たりの変化に比例する。
したがって、位置P2の検出部12aに生じる誘導起電力V2は、位置P1で生じる誘導起電力V1よりも大きくなる(V2>V1)。
つまり、検出部12aが励磁コイル20の先端に向けて進入するに伴い、発生する誘導起電力Vが大きくなる。 Here, the induced electromotive forces V1 and V2 respectively generated in thedetection coil 12 at the position in FIG. 2A (hereinafter, position P1) and the position in FIG. 2B (hereinafter, position P2) will be described.
When an alternating current is applied from thepower supply 27, a magnetic flux φ (magnetic field) is generated inside the magnetic path 25 of the exciting coil 20, as shown in FIG. Since the magnetic path 25 is formed so as to narrow toward the tip, the magnetic flux density increases toward the tip.
As a result, more magnetic flux φ penetrates thedetection unit 12a at the position P2 than at the position P1. Further, since an alternating current is applied to the exciting coil 20, the change in the magnetic flux passing through the detection unit 12a per unit time per unit time is more in the detection unit 12a at the position P2 than in the case of the position P1. large.
The induced electromotive force V is proportional to the change per unit time of the magnetic flux φ penetrating thedetection unit 12a.
Therefore, the induced electromotive force V2 generated in thedetection unit 12a at the position P2 is larger than the induced electromotive force V1 generated at the position P1 (V2> V1).
That is, the induced electromotive force V generated increases as thedetection unit 12a enters toward the tip of the exciting coil 20.
電源27から交流電流が印加されると、図3に示すように、励磁コイル20の磁路25の内部に磁束φ(磁場)が生じる。そして、磁路25は先端に向けて狭くなるよう形成されているため、磁束密度は先端に向けて高くなる。
そうすると、位置P2における検出部12aには、位置P1に比べ、より多くの磁束φが貫くこととなる。また、励磁コイル20には交流電流が印加されているため、単位時間当たりに検出部12aを貫く磁束の単位時間当たりの変化も、位置P1の場合よりも、位置P2における検出部12aの方が大きい。
また、誘導起電力Vは,検出部12aを貫く磁束φの単位時間当たりの変化に比例する。
したがって、位置P2の検出部12aに生じる誘導起電力V2は、位置P1で生じる誘導起電力V1よりも大きくなる(V2>V1)。
つまり、検出部12aが励磁コイル20の先端に向けて進入するに伴い、発生する誘導起電力Vが大きくなる。 Here, the induced electromotive forces V1 and V2 respectively generated in the
When an alternating current is applied from the
As a result, more magnetic flux φ penetrates the
The induced electromotive force V is proportional to the change per unit time of the magnetic flux φ penetrating the
Therefore, the induced electromotive force V2 generated in the
That is, the induced electromotive force V generated increases as the
[検出器30]
検出器30は、検出コイル12の誘導起電力Vを継続して検出し、さらに検出した誘導起電力Vに対応する励磁コイル20におけるコイル10の位置Pを検出する。そして、コイル10の位置Pに基づいて、検査対象の位置を特定する。
位置検出センサ1は2種類の特定方法により検出対象の位置P’を特定できる。検出対象の位置P’は、いずれか1つの方法により特定できるし、2つの方法を併用して特定もできる。 [Detector 30]
Thedetector 30 continuously detects the induced electromotive force V of the detection coil 12, and further detects the position P of the coil 10 in the exciting coil 20 corresponding to the detected induced electromotive force V. Then, based on the position P of the coil 10, the position of the inspection object is specified.
Theposition detection sensor 1 can specify the position P ′ to be detected by two types of specifying methods. The position P ′ to be detected can be specified by any one method, and can also be specified by using two methods in combination.
検出器30は、検出コイル12の誘導起電力Vを継続して検出し、さらに検出した誘導起電力Vに対応する励磁コイル20におけるコイル10の位置Pを検出する。そして、コイル10の位置Pに基づいて、検査対象の位置を特定する。
位置検出センサ1は2種類の特定方法により検出対象の位置P’を特定できる。検出対象の位置P’は、いずれか1つの方法により特定できるし、2つの方法を併用して特定もできる。 [Detector 30]
The
The
1つ目は、磁路25におけるコイル10の位置Pに対する誘導起電力Vの変化に関する相関データに基づきコイル10の位置を特定し、検出対象の位置P’を特定する方法である。
検出器30は、コイル10の位置Pに対する誘導起電力Vの変化に関する相関データを保持する。相関データは、位置検出センサ1を用い、コイル10の所定位置Pに対応する誘導起電力Vを測定することで得ることができる。図4(a)に相関データの一例を線図にして示しているが、検出器30は、テーブル形式のデータとして保持することができるし、また、関数として保持することもできる。また、図4(a)の相関データは、位置Pと誘導起電力Vが比例関係にあるが、これはあくまで一例にすぎない。
位置検出センサ1は、検出器30が誘導起電力Vを検出すると、相関データからコイル10の位置Pを特定する。
さらに、検出器30は励磁コイル20におけるコイル10の位置Pに対する検出対象の位置P’の相関に関する相関データを保持する。この相関データに基づいて、特定したコイル10の位置Pから検出対象の位置P’を特定する。 The first method is to specify the position P ′ of the detection target by specifying the position of thecoil 10 based on the correlation data regarding the change of the induced electromotive force V with respect to the position P of the coil 10 in the magnetic path 25.
Thedetector 30 holds correlation data regarding the change in the induced electromotive force V with respect to the position P of the coil 10. The correlation data can be obtained by using the position detection sensor 1 and measuring the induced electromotive force V corresponding to the predetermined position P of the coil 10. FIG. 4A shows an example of the correlation data as a diagram, but the detector 30 can hold data as a table format or can also hold it as a function. Further, in the correlation data in FIG. 4A, the position P and the induced electromotive force V are in a proportional relationship, but this is merely an example.
When thedetector 30 detects the induced electromotive force V, the position detection sensor 1 specifies the position P of the coil 10 from the correlation data.
Further, thedetector 30 holds correlation data regarding the correlation between the position P ′ of the detection target and the position P of the coil 10 in the exciting coil 20. Based on the correlation data, the position P ′ to be detected is specified from the specified position P of the coil 10.
検出器30は、コイル10の位置Pに対する誘導起電力Vの変化に関する相関データを保持する。相関データは、位置検出センサ1を用い、コイル10の所定位置Pに対応する誘導起電力Vを測定することで得ることができる。図4(a)に相関データの一例を線図にして示しているが、検出器30は、テーブル形式のデータとして保持することができるし、また、関数として保持することもできる。また、図4(a)の相関データは、位置Pと誘導起電力Vが比例関係にあるが、これはあくまで一例にすぎない。
位置検出センサ1は、検出器30が誘導起電力Vを検出すると、相関データからコイル10の位置Pを特定する。
さらに、検出器30は励磁コイル20におけるコイル10の位置Pに対する検出対象の位置P’の相関に関する相関データを保持する。この相関データに基づいて、特定したコイル10の位置Pから検出対象の位置P’を特定する。 The first method is to specify the position P ′ of the detection target by specifying the position of the
The
When the
Further, the
2つ目は、磁路25におけるコイル10の位置Pに対する電圧比Rの変化に関する相関データに基づき、コイル10の位置を特定し、検出対象の位置P’を特定する方法である。
ここで、電圧比Rとは、励磁コイル20の電圧に対するコイル10の電圧の比をいう。
励磁コイル20は電源27により一定の電圧が印加される。そのため、コイル10の所定の位置における電圧比Rは変化しない。
電源27は、励磁コイル20に印加している電圧を検出器30に伝達する。また、検出器30は、検出コイル12の誘導起電力Vを検知する。そうすると、検出器30は、励磁コイル20に印加されている電圧と、コイル10の誘導起電力Vの双方を検知し、電圧比Rを算出する。
また、検出器30は、コイル10の位置Pに対する電圧比Rに関する相関データ(図4(a)点線)、およびコイル10の位置Pに対する検出対象の位置P’に関する相関データを保持する。なお、この相関データは、位置Pと電圧比Rが比例関係にあるが、これはあくまで一例にすぎない。
検出器30は、算出した電圧比から、相関データに基づいてコイル10の位置Pを特定する。そして、特定したコイル10の位置Pから相関データに基づいて、検出対象の位置P’を特定する。
電圧比Rに基づいてコイル10の位置Pを特定することで、例えば落雷により電源27の印加電圧が変化したり、周囲の磁気環境によって励磁コイル20にかかる電圧の変化が生じたとしても、検出対象の位置P’を特定することができる。 The second is a method of specifying the position of thecoil 10 and specifying the position P ′ to be detected based on the correlation data regarding the change in the voltage ratio R with respect to the position P of the coil 10 in the magnetic path 25.
Here, the voltage ratio R refers to the ratio of the voltage of thecoil 10 to the voltage of the exciting coil 20.
A constant voltage is applied to theexciting coil 20 by a power source 27. Therefore, the voltage ratio R at a predetermined position of the coil 10 does not change.
Thepower supply 27 transmits the voltage applied to the excitation coil 20 to the detector 30. The detector 30 detects the induced electromotive force V of the detection coil 12. Then, the detector 30 detects both the voltage applied to the exciting coil 20 and the induced electromotive force V of the coil 10, and calculates the voltage ratio R.
Further, thedetector 30 holds correlation data regarding the voltage ratio R with respect to the position P of the coil 10 (FIG. 4A) and correlation data regarding the position P ′ of the detection target with respect to the position P of the coil 10. In this correlation data, the position P and the voltage ratio R are in a proportional relationship, but this is merely an example.
Thedetector 30 specifies the position P of the coil 10 based on the correlation data from the calculated voltage ratio. Then, the position P ′ to be detected is specified based on the correlation data from the specified position P of the coil 10.
By specifying the position P of thecoil 10 based on the voltage ratio R, even if the applied voltage of the power source 27 changes due to a lightning strike or the voltage applied to the exciting coil 20 changes due to the surrounding magnetic environment, it is detected. The target position P ′ can be specified.
ここで、電圧比Rとは、励磁コイル20の電圧に対するコイル10の電圧の比をいう。
励磁コイル20は電源27により一定の電圧が印加される。そのため、コイル10の所定の位置における電圧比Rは変化しない。
電源27は、励磁コイル20に印加している電圧を検出器30に伝達する。また、検出器30は、検出コイル12の誘導起電力Vを検知する。そうすると、検出器30は、励磁コイル20に印加されている電圧と、コイル10の誘導起電力Vの双方を検知し、電圧比Rを算出する。
また、検出器30は、コイル10の位置Pに対する電圧比Rに関する相関データ(図4(a)点線)、およびコイル10の位置Pに対する検出対象の位置P’に関する相関データを保持する。なお、この相関データは、位置Pと電圧比Rが比例関係にあるが、これはあくまで一例にすぎない。
検出器30は、算出した電圧比から、相関データに基づいてコイル10の位置Pを特定する。そして、特定したコイル10の位置Pから相関データに基づいて、検出対象の位置P’を特定する。
電圧比Rに基づいてコイル10の位置Pを特定することで、例えば落雷により電源27の印加電圧が変化したり、周囲の磁気環境によって励磁コイル20にかかる電圧の変化が生じたとしても、検出対象の位置P’を特定することができる。 The second is a method of specifying the position of the
Here, the voltage ratio R refers to the ratio of the voltage of the
A constant voltage is applied to the
The
Further, the
The
By specifying the position P of the
これまで説明した位置検出センサ1は、直線運動する検出対象を対象としているが、検出対象が回転する場合、その回転角度θを検出する回転角度検出センサとして用いることもできる。
この場合、ホルダ11と検出対象の間に運動変換機構を介在させる。運動変換機構は、回転運動を直線運動に変換する機構であり、例えばラック・アンド・ピニオン機構を採用することができる。
検出対象が回転運動すると、運動変換機構により、ホルダ11が直線運動する。そのため、コイル10は磁路25の内部を進退する。コイル10が磁路25を進退すると、検出コイル12に誘導起電力Vが生じ、その誘導起電力Vは検出器30で検出される。
この場合、検出器30は、コイル10の位置Pに対する誘導起電力Vに関する相関データとコイル10の位置Pに対する回転角度θに関する相関データから得られる、回転角度θに対する誘導起電力Vの変化に関する相関データを保持する。検出器30は、コイル10の位置Pから回転角度θを特定できる。
また、回転角度検出センサ2は、電圧比Rによっても回転角度θを検出できる。この場合、検出器30は、電圧比Rに対する回転角度θに関するデータを保持し、算出した電圧比Rから回転角度θを特定する。 Theposition detection sensor 1 described so far is targeted for a detection object that moves linearly, but can also be used as a rotation angle detection sensor that detects the rotation angle θ when the detection object rotates.
In this case, a motion conversion mechanism is interposed between theholder 11 and the detection target. The motion conversion mechanism is a mechanism that converts rotational motion into linear motion, and for example, a rack and pinion mechanism can be adopted.
When the detection target rotates, theholder 11 moves linearly by the motion conversion mechanism. Therefore, the coil 10 advances and retreats inside the magnetic path 25. When the coil 10 moves back and forth in the magnetic path 25, an induced electromotive force V is generated in the detection coil 12, and the induced electromotive force V is detected by the detector 30.
In this case, thedetector 30 correlates the change in the induced electromotive force V with respect to the rotation angle θ obtained from the correlation data regarding the induced electromotive force V with respect to the position P of the coil 10 and the correlation data with respect to the rotation angle θ with respect to the position P of the coil 10. Retain data. The detector 30 can specify the rotation angle θ from the position P of the coil 10.
Further, the rotationangle detection sensor 2 can detect the rotation angle θ also by the voltage ratio R. In this case, the detector 30 holds data regarding the rotation angle θ with respect to the voltage ratio R, and identifies the rotation angle θ from the calculated voltage ratio R.
この場合、ホルダ11と検出対象の間に運動変換機構を介在させる。運動変換機構は、回転運動を直線運動に変換する機構であり、例えばラック・アンド・ピニオン機構を採用することができる。
検出対象が回転運動すると、運動変換機構により、ホルダ11が直線運動する。そのため、コイル10は磁路25の内部を進退する。コイル10が磁路25を進退すると、検出コイル12に誘導起電力Vが生じ、その誘導起電力Vは検出器30で検出される。
この場合、検出器30は、コイル10の位置Pに対する誘導起電力Vに関する相関データとコイル10の位置Pに対する回転角度θに関する相関データから得られる、回転角度θに対する誘導起電力Vの変化に関する相関データを保持する。検出器30は、コイル10の位置Pから回転角度θを特定できる。
また、回転角度検出センサ2は、電圧比Rによっても回転角度θを検出できる。この場合、検出器30は、電圧比Rに対する回転角度θに関するデータを保持し、算出した電圧比Rから回転角度θを特定する。 The
In this case, a motion conversion mechanism is interposed between the
When the detection target rotates, the
In this case, the
Further, the rotation
本実施形態は、検出器30の具体的な構成を問わず、誘導起電力Vを検出できる公知の回路、機器を検出器30に適用できる。ただし、本発明は低コストで検出対象の位置P’あるいは回転角度θを検出することを目的としているので、検出器30はこの目的に沿う構成にすることが望まれる。もっとも、相関データを保持し、かつ、検出された誘導起電力Vに対応する回転角度θを特定するという簡易な信号処理が行えれば足りるので、安価な1チップのマイクロコンピュータで検出器30を構成することができる。
In the present embodiment, a known circuit or device that can detect the induced electromotive force V can be applied to the detector 30 regardless of the specific configuration of the detector 30. However, since the present invention aims to detect the position P ′ or the rotation angle θ of the detection target at low cost, it is desirable that the detector 30 be configured to meet this purpose. However, it is only necessary to perform simple signal processing for holding the correlation data and specifying the rotation angle θ corresponding to the detected induced electromotive force V. Therefore, the detector 30 can be implemented by an inexpensive one-chip microcomputer. Can be configured.
[第2実施形態]
本実施形態ではコイル50が、円弧状に進退する回転角度検出センサ2について説明する。
本実施形態に係る回転角度検出センサ2は、図5に示すように、鎌状に形成されたホルダ51を備えるコイル50と、ホルダ51が進退する円弧状の磁路65を備える励磁コイル60と、コイル50から取得した誘導起電力Vから回転角度θを求める検出器30と、を構成要素として備える。
以下、回転角度検出センサ2の各構成要素を順に説明する。なお、第1実施形態と同様の構成には同じ符号を付し、説明を省略する。
なお、回転角度検出センサ2は2種類の特定方法により検出対象の位置P’を特定できる。検出対象の位置P’は、いずれか1つの方法により特定できるし、2つの方法を併用して特定もできる。 [Second Embodiment]
In the present embodiment, the rotationangle detection sensor 2 in which the coil 50 advances and retreats in an arc shape will be described.
As shown in FIG. 5, the rotationangle detection sensor 2 according to the present embodiment includes a coil 50 including a holder 51 formed in a sickle shape, and an excitation coil 60 including an arc-shaped magnetic path 65 in which the holder 51 advances and retreats. And a detector 30 that obtains the rotation angle θ from the induced electromotive force V acquired from the coil 50, as a constituent element.
Hereinafter, each component of the rotationangle detection sensor 2 will be described in order. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted.
The rotationangle detection sensor 2 can specify the position P ′ to be detected by two types of specifying methods. The position P ′ to be detected can be specified by any one method, and can also be specified by using two methods in combination.
本実施形態ではコイル50が、円弧状に進退する回転角度検出センサ2について説明する。
本実施形態に係る回転角度検出センサ2は、図5に示すように、鎌状に形成されたホルダ51を備えるコイル50と、ホルダ51が進退する円弧状の磁路65を備える励磁コイル60と、コイル50から取得した誘導起電力Vから回転角度θを求める検出器30と、を構成要素として備える。
以下、回転角度検出センサ2の各構成要素を順に説明する。なお、第1実施形態と同様の構成には同じ符号を付し、説明を省略する。
なお、回転角度検出センサ2は2種類の特定方法により検出対象の位置P’を特定できる。検出対象の位置P’は、いずれか1つの方法により特定できるし、2つの方法を併用して特定もできる。 [Second Embodiment]
In the present embodiment, the rotation
As shown in FIG. 5, the rotation
Hereinafter, each component of the rotation
The rotation
[コイル50]
コイル50は、回転軸55を中心にして正転及び逆転、つまり揺動運動が可能に支持された部材であり、回転軸55に支持されるホルダ51と、ホルダ51の内部に設けられている検出コイル52と、を備えている。コイル50は、回転軸55を中心にして、図5に示される基準位置(回転角度=0度)から、図6(a)の途中の位置を通過して、図6(b)に示される最大変位位置(回転角度=90度)までの範囲で揺動が可能とされている。 [Coil 50]
Thecoil 50 is a member supported so as to be capable of normal rotation and reverse rotation, that is, swinging movement about the rotation shaft 55, and is provided inside the holder 51, which is supported by the rotation shaft 55. And a detection coil 52. The coil 50 passes through a position in the middle of FIG. 6A from the reference position (rotation angle = 0 degree) shown in FIG. 5 around the rotation shaft 55, and is shown in FIG. 6B. Oscillation is possible in the range up to the maximum displacement position (rotation angle = 90 degrees).
コイル50は、回転軸55を中心にして正転及び逆転、つまり揺動運動が可能に支持された部材であり、回転軸55に支持されるホルダ51と、ホルダ51の内部に設けられている検出コイル52と、を備えている。コイル50は、回転軸55を中心にして、図5に示される基準位置(回転角度=0度)から、図6(a)の途中の位置を通過して、図6(b)に示される最大変位位置(回転角度=90度)までの範囲で揺動が可能とされている。 [Coil 50]
The
[ホルダ51]
ホルダ51は、樹脂からなり、平面視した形状が鎌状の部材である。ホルダ51は、円弧状の挿入部53と直線状の揺動部54からなる。挿入部53は、励磁コイル60の磁路65の内部を進退する。また、挿入部53の内部には、検出コイル52が設けられている。
検出コイル52は、挿入部53の形状に沿って形成され、先端には検出部52aが形成されている。検出コイル52のリード線の両端は検出器30に接続されている。
検出コイル52は、磁束φを生じている磁路65の内部を進退することにより、誘導起電力Vが発生する。この誘導起電力の変化を検出器30で変換処理することにより、検出された誘導起電力Vに応じたコイル50の回転角度θを特定する。 [Holder 51]
Theholder 51 is made of resin, and is a sickle-like member in plan view. The holder 51 includes an arcuate insertion portion 53 and a linear swinging portion 54. The insertion portion 53 moves back and forth inside the magnetic path 65 of the exciting coil 60. A detection coil 52 is provided inside the insertion portion 53.
Thedetection coil 52 is formed along the shape of the insertion portion 53, and a detection portion 52a is formed at the tip. Both ends of the lead wire of the detection coil 52 are connected to the detector 30.
Thedetection coil 52 moves back and forth in the magnetic path 65 generating the magnetic flux φ, thereby generating an induced electromotive force V. The change in the induced electromotive force is converted by the detector 30 to identify the rotation angle θ of the coil 50 according to the detected induced electromotive force V.
ホルダ51は、樹脂からなり、平面視した形状が鎌状の部材である。ホルダ51は、円弧状の挿入部53と直線状の揺動部54からなる。挿入部53は、励磁コイル60の磁路65の内部を進退する。また、挿入部53の内部には、検出コイル52が設けられている。
検出コイル52は、挿入部53の形状に沿って形成され、先端には検出部52aが形成されている。検出コイル52のリード線の両端は検出器30に接続されている。
検出コイル52は、磁束φを生じている磁路65の内部を進退することにより、誘導起電力Vが発生する。この誘導起電力の変化を検出器30で変換処理することにより、検出された誘導起電力Vに応じたコイル50の回転角度θを特定する。 [Holder 51]
The
The
The
ホルダ51の外周縁51a及び内周縁51bが単一の曲率をもつ円弧状である必要はなく、例えば、外周縁51a及び内周縁51bの各々を直線又は曲線をつなぎ合わせて形成してもよい。要は、円弧状の磁路65を、励磁コイル60に干渉することなく進退できる形態であれば、本実施形態において機能させることができる。
The outer peripheral edge 51a and the inner peripheral edge 51b of the holder 51 do not have to have an arc shape with a single curvature. For example, the outer peripheral edge 51a and the inner peripheral edge 51b may be formed by connecting straight lines or curved lines. In short, the arc-shaped magnetic path 65 can function in the present embodiment as long as it can advance and retract without interfering with the exciting coil 60.
ホルダ51は、中心角αが90度である。この中心角αは、回転角度検出センサ2の検出対象の回転角度が90度以下である場合に対応して設定されている。したがって、検出対象の回転角度が90度を越える場合には、ホルダ51の中心角αは、当該回転角度に対応する角度に設定される。
The holder 51 has a central angle α of 90 degrees. This center angle α is set corresponding to the case where the rotation angle of the detection target of the rotation angle detection sensor 2 is 90 degrees or less. Therefore, when the rotation angle of the detection target exceeds 90 degrees, the center angle α of the holder 51 is set to an angle corresponding to the rotation angle.
揺動部54は、一端が回転軸55の回転に追従して回転可能に軸支されるとともに、他端が挿入部53とその後端51dで支持するものであり、機械的な構造部材として機能する。したがって、この機能を有する限り、形状及び材質は問われない。この挿入部53と揺動部54が一体のホルダ51は、例えば、射出成形で作製することができる。
もちろん、揺動部54の部分を挿入部53とは別体として作製し、挿入部53と接合することで、ホルダ51を作製することもできる。
本実施形態のコイル50は、挿入部53の後端51dを揺動部54で支持するので、支持部分である後端51dから先端51cまでのほぼ全範囲が磁路65を進退することができる。したがって、本実施形態によると、磁路65を進退しない挿入部53の領域をなくすことができるので、回転角度検出センサ2の小型化に寄与する要因である。 One end of the swingingportion 54 is rotatably supported following the rotation of the rotation shaft 55, and the other end is supported by the insertion portion 53 and the rear end 51d, and functions as a mechanical structural member. To do. Therefore, as long as it has this function, a shape and a material are not ask | required. The holder 51 in which the insertion portion 53 and the swinging portion 54 are integrated can be manufactured by, for example, injection molding.
Of course, theholder 51 can also be manufactured by manufacturing the part of the rocking | swiveling part 54 as a different body from the insertion part 53, and joining with the insertion part 53. FIG.
Since thecoil 50 of the present embodiment supports the rear end 51d of the insertion portion 53 with the swinging portion 54, almost the entire range from the rear end 51d, which is a support portion, to the front end 51c can advance and retract the magnetic path 65. . Therefore, according to the present embodiment, the region of the insertion portion 53 that does not advance or retract the magnetic path 65 can be eliminated, which is a factor contributing to downsizing of the rotation angle detection sensor 2.
もちろん、揺動部54の部分を挿入部53とは別体として作製し、挿入部53と接合することで、ホルダ51を作製することもできる。
本実施形態のコイル50は、挿入部53の後端51dを揺動部54で支持するので、支持部分である後端51dから先端51cまでのほぼ全範囲が磁路65を進退することができる。したがって、本実施形態によると、磁路65を進退しない挿入部53の領域をなくすことができるので、回転角度検出センサ2の小型化に寄与する要因である。 One end of the swinging
Of course, the
Since the
回転軸55は、回転駆動される種々の機械要素の回転軸(以下、原動軸)の動作に同期して回転される。原動軸を延長して回転軸55として機能させることができるし、原動軸に直接的にまたは間接的に回転軸55を接続することもできる。間接的に接続する例としては、減速機又は増速機を介在させることが想定される。
The rotary shaft 55 is rotated in synchronism with the operation of the rotary shafts (hereinafter referred to as “drive shafts”) of various machine elements that are rotationally driven. The driving shaft can be extended to function as the rotating shaft 55, or the rotating shaft 55 can be connected directly or indirectly to the driving shaft. As an example of indirectly connecting, it is assumed that a reduction gear or a speed increaser is interposed.
[励磁コイル60]
励磁コイル60は、電線を巻き回してなる巻線61と、巻線61を内側から保持するボビン63と、を備えており、ボビン63の内部に磁路65が構成される。励磁コイル60は、コイル50のホルダ51の形状に対応してボビン63を形成することで、磁路65を円弧状に形成している。
ここで、円弧状とは、磁路65のように先細りであっても、その中心線が円弧状をなしているものも含む意図である。
また、励磁コイル60は、横断面が円形をなしており、先端に向けて内径が小さくなるよう形成されている。そのため、磁路65は、先端に向けて狭くなるように形成されている。
この例では、励磁コイル60の中心角βは、ホルダ51の中心角αに一致する90度であるが、ホルダ51の中心角αに対応して設定される。 [Excitation coil 60]
Theexciting coil 60 includes a winding 61 formed by winding an electric wire, and a bobbin 63 that holds the winding 61 from the inside. A magnetic path 65 is formed inside the bobbin 63. The exciting coil 60 forms a magnetic path 65 in an arc shape by forming a bobbin 63 corresponding to the shape of the holder 51 of the coil 50.
Here, the arc shape is intended to include a taper like themagnetic path 65 even if the center line is an arc shape.
Theexciting coil 60 has a circular cross section and is formed so that the inner diameter decreases toward the tip. Therefore, the magnetic path 65 is formed so as to narrow toward the tip.
In this example, the central angle β of theexciting coil 60 is 90 degrees that matches the central angle α of the holder 51, but is set corresponding to the central angle α of the holder 51.
励磁コイル60は、電線を巻き回してなる巻線61と、巻線61を内側から保持するボビン63と、を備えており、ボビン63の内部に磁路65が構成される。励磁コイル60は、コイル50のホルダ51の形状に対応してボビン63を形成することで、磁路65を円弧状に形成している。
ここで、円弧状とは、磁路65のように先細りであっても、その中心線が円弧状をなしているものも含む意図である。
また、励磁コイル60は、横断面が円形をなしており、先端に向けて内径が小さくなるよう形成されている。そのため、磁路65は、先端に向けて狭くなるように形成されている。
この例では、励磁コイル60の中心角βは、ホルダ51の中心角αに一致する90度であるが、ホルダ51の中心角αに対応して設定される。 [Excitation coil 60]
The
Here, the arc shape is intended to include a taper like the
The
In this example, the central angle β of the
ここで、図6(a)の位置(以下、位置P3)、および図6(b)の位置(以下、位置P4)において、検出コイル52に発生する誘導起電力V3,V4について説明する。
励磁コイル60は先端に向けて磁路65が狭くなっている。そのため、位置P4における検出部52aには、位置P3と比べて、より多くの磁束φが貫通している。そのため、基準位置から励磁コイル60の先端に位置するほど、磁束密度が高くなる。したがって、位置P4の検出部52aに生じる誘導起電力V4は、位置P3で生じる誘導起電力V3よりも大きくなる(V4>V3)。
つまり、検出部52aが励磁コイル60の先端に向けて進入するに伴い、発生する誘導起電力Vが大きくなる。 Here, the induced electromotive forces V3 and V4 generated in thedetection coil 52 at the position in FIG. 6A (hereinafter, position P3) and the position in FIG. 6B (hereinafter, position P4) will be described.
Theexciting coil 60 has a magnetic path 65 that narrows toward the tip. Therefore, more magnetic flux φ penetrates the detection unit 52a at the position P4 than at the position P3. For this reason, the magnetic flux density increases as the position from the reference position to the tip of the exciting coil 60 increases. Therefore, the induced electromotive force V4 generated in the detection unit 52a at the position P4 is larger than the induced electromotive force V3 generated at the position P3 (V4> V3).
That is, the induced electromotive force V generated increases as thedetection unit 52a enters toward the tip of the exciting coil 60.
励磁コイル60は先端に向けて磁路65が狭くなっている。そのため、位置P4における検出部52aには、位置P3と比べて、より多くの磁束φが貫通している。そのため、基準位置から励磁コイル60の先端に位置するほど、磁束密度が高くなる。したがって、位置P4の検出部52aに生じる誘導起電力V4は、位置P3で生じる誘導起電力V3よりも大きくなる(V4>V3)。
つまり、検出部52aが励磁コイル60の先端に向けて進入するに伴い、発生する誘導起電力Vが大きくなる。 Here, the induced electromotive forces V3 and V4 generated in the
The
That is, the induced electromotive force V generated increases as the
本実施形態における検出器30は、回転角度θを算出するために、コイル50の回転角度θに対する誘導起電力Vの変化に関する相関データを保持する。相関データは、回転角度検出センサ2を用い、コイル50を所定角度、例えば0度、1度、2度…というように1度ずつ回転させる度に、各回転角度θに対応する誘導起電力Vを測定することで得ることができる(図4(b))。
回転角度検出センサ2は、回転角度θの検出対象に適用されている際には、検出器30が誘導起電力Vを検出すると、相関データを参照して検出された誘導起電力Vに対応する回転角度θを特定する。特定された回転角度θは、検出対象の制御処理に用いられる。 In order to calculate the rotation angle θ, thedetector 30 in the present embodiment holds correlation data regarding the change in the induced electromotive force V with respect to the rotation angle θ of the coil 50. The correlation data is obtained by using the rotation angle detection sensor 2 and the induced electromotive force V corresponding to each rotation angle θ each time the coil 50 is rotated by a predetermined angle, for example, 0 degree, 1 degree, 2 degrees, etc. Can be obtained by measuring (FIG. 4B).
When the rotationangle detection sensor 2 is applied to a detection target of the rotation angle θ, when the detector 30 detects the induced electromotive force V, the rotation angle detection sensor 2 corresponds to the induced electromotive force V detected with reference to the correlation data. The rotation angle θ is specified. The identified rotation angle θ is used for control processing of the detection target.
回転角度検出センサ2は、回転角度θの検出対象に適用されている際には、検出器30が誘導起電力Vを検出すると、相関データを参照して検出された誘導起電力Vに対応する回転角度θを特定する。特定された回転角度θは、検出対象の制御処理に用いられる。 In order to calculate the rotation angle θ, the
When the rotation
回転角度検出センサ2は、回転角度θの検出対象に適用されている際、磁路65におけるコイル50の回転角度θに対する電圧比Rの変化に基づき回転角度θを特定することもできる。
この場合、検出器30は、電圧比Rに対する回転角度θに関する相関データを保持する。そのため、検出器30は、電圧比Rに基づいて回転角度θを特定できる。電圧比Rに基づいて検出対象の回転角度θを特定することで、励磁コイル20に印加される電圧に変化が生じたとしても、検出対象の回転角度θを特定できる。 The rotationangle detection sensor 2 can also specify the rotation angle θ based on the change of the voltage ratio R with respect to the rotation angle θ of the coil 50 in the magnetic path 65 when applied to the detection target of the rotation angle θ.
In this case, thedetector 30 holds correlation data regarding the rotation angle θ with respect to the voltage ratio R. Therefore, the detector 30 can specify the rotation angle θ based on the voltage ratio R. By specifying the rotation angle θ of the detection target based on the voltage ratio R, the rotation angle θ of the detection target can be specified even if a change occurs in the voltage applied to the excitation coil 20.
この場合、検出器30は、電圧比Rに対する回転角度θに関する相関データを保持する。そのため、検出器30は、電圧比Rに基づいて回転角度θを特定できる。電圧比Rに基づいて検出対象の回転角度θを特定することで、励磁コイル20に印加される電圧に変化が生じたとしても、検出対象の回転角度θを特定できる。 The rotation
In this case, the
[用途例]
本実施形態の回転角度検出センサ2の用途の一つとして、FIシステムの構成要素であるスロットルバルブの回転角度を検出するのに用いることができる。
第1実施形態で説明した構成と同様な箇所は説明を省略する。
図7に、構成の概略を示す。回転角度検出センサ2は、弁体43の開度を検出するのに用いられる。
回転角度検出センサ2は、コイル50の回転軸55が弁軸41に接続されており、弁軸41が電動アクチュエータ45により駆動されると、弁軸41に追従して回転軸55が回転する。回転軸55の回転に伴ってホルダ51が磁路65を進退し、励磁コイル60の誘導起電力Vが変動するので、ECU35は検出する誘導起電力Vに基づいて、回転軸55の回転角度θ、つまり弁体43の開度を検出することができる。ECU35は、検出した弁体43の開度を参照しながら、電動アクチュエータ45に制御信号を送る。 [Application example]
As one of the uses of the rotationangle detection sensor 2 of the present embodiment, it can be used to detect the rotation angle of a throttle valve that is a component of the FI system.
Description of the same parts as those described in the first embodiment is omitted.
FIG. 7 shows an outline of the configuration. The rotationangle detection sensor 2 is used to detect the opening degree of the valve body 43.
In the rotationangle detection sensor 2, the rotation shaft 55 of the coil 50 is connected to the valve shaft 41, and when the valve shaft 41 is driven by the electric actuator 45, the rotation shaft 55 rotates following the valve shaft 41. As the rotary shaft 55 rotates, the holder 51 moves back and forth in the magnetic path 65, and the induced electromotive force V of the exciting coil 60 fluctuates. Therefore, the ECU 35 rotates the rotational angle θ of the rotary shaft 55 based on the induced electromotive force V detected. That is, the opening degree of the valve body 43 can be detected. The ECU 35 sends a control signal to the electric actuator 45 while referring to the detected opening of the valve body 43.
本実施形態の回転角度検出センサ2の用途の一つとして、FIシステムの構成要素であるスロットルバルブの回転角度を検出するのに用いることができる。
第1実施形態で説明した構成と同様な箇所は説明を省略する。
図7に、構成の概略を示す。回転角度検出センサ2は、弁体43の開度を検出するのに用いられる。
回転角度検出センサ2は、コイル50の回転軸55が弁軸41に接続されており、弁軸41が電動アクチュエータ45により駆動されると、弁軸41に追従して回転軸55が回転する。回転軸55の回転に伴ってホルダ51が磁路65を進退し、励磁コイル60の誘導起電力Vが変動するので、ECU35は検出する誘導起電力Vに基づいて、回転軸55の回転角度θ、つまり弁体43の開度を検出することができる。ECU35は、検出した弁体43の開度を参照しながら、電動アクチュエータ45に制御信号を送る。 [Application example]
As one of the uses of the rotation
Description of the same parts as those described in the first embodiment is omitted.
FIG. 7 shows an outline of the configuration. The rotation
In the rotation
以上、本発明の実施形態を説明したが、本発明の主旨を逸脱しない限り、上記実施形態で挙げた構成を取捨選択したり、他の構成に適宜変更したりすることが可能である。
例えば、本実施形態では、先端に向けて径が小さくなる励磁コイル20,60を用いたが、本発明はコイルの内径が先端に向けて漸次変化すればよいため、先端に向けて内径が大きくなるコイルを適用することもできる。
なお、本実施形態では、励磁コイル20,60は、横断面の形状が円形として説明をしたが、磁路25,65が漸次狭くなるよう形成されていればよいため、断面を矩形状に形成することもできる。 The embodiments of the present invention have been described above. However, the configurations described in the above embodiments can be selected or changed to other configurations as appropriate without departing from the gist of the present invention.
For example, in this embodiment, the exciting coils 20 and 60 whose diameter decreases toward the tip are used. However, in the present invention, since the inner diameter of the coil only needs to gradually change toward the tip, the inner diameter increases toward the tip. A coil can be applied.
In the present embodiment, the excitation coils 20 and 60 are described as having a circular cross-sectional shape. However, since the magnetic paths 25 and 65 only need to be gradually narrowed, the cross-section is formed in a rectangular shape. You can also
例えば、本実施形態では、先端に向けて径が小さくなる励磁コイル20,60を用いたが、本発明はコイルの内径が先端に向けて漸次変化すればよいため、先端に向けて内径が大きくなるコイルを適用することもできる。
なお、本実施形態では、励磁コイル20,60は、横断面の形状が円形として説明をしたが、磁路25,65が漸次狭くなるよう形成されていればよいため、断面を矩形状に形成することもできる。 The embodiments of the present invention have been described above. However, the configurations described in the above embodiments can be selected or changed to other configurations as appropriate without departing from the gist of the present invention.
For example, in this embodiment, the
In the present embodiment, the excitation coils 20 and 60 are described as having a circular cross-sectional shape. However, since the
また、本実施形態では誘導起電力Vを検出することで検出対象の位置P’あるいは回転角度θを特定する方法を説明したが、ホルダ11,51が磁路25,65を進退することにより生じるインダクタンスを検出することでも検出対象の位置P’あるいは回転角度θを特定できる。
また、第2実施形態は、検出する回転角度の範囲を0~90度の例を説明したが、本発明は、90度を超える回転角度を検出することができる。ただし、揺動部54と励磁コイル60の干渉を避ける必要があるので、検出できる最大の回転角度の範囲は0~180度になる。
また、本実施形態は、巻線21(ボビン23)の内部に形成される磁路25をコイル50が進退する構成としているが、磁路を構成する磁束は巻線21の周囲にも生じるので、本発明は検出コイルの周囲に形成される磁路をホルダが進退する構成にすることもできる。
さらに、本発明による回転角度検出センサの適用用途は、FIシステムのスロットルバルブの開度検出に限らない。 In the present embodiment, the method of specifying the position P ′ or the rotation angle θ of the detection target by detecting the induced electromotive force V has been described. However, the holders 11 and 51 move forward and backward through the magnetic paths 25 and 65. The position P ′ or the rotation angle θ of the detection target can also be specified by detecting the inductance.
In the second embodiment, an example in which the range of rotation angles to be detected is 0 to 90 degrees has been described. However, the present invention can detect rotation angles exceeding 90 degrees. However, since it is necessary to avoid interference between theoscillating portion 54 and the exciting coil 60, the range of the maximum rotation angle that can be detected is 0 to 180 degrees.
In the present embodiment, themagnetic path 25 formed inside the winding 21 (bobbin 23) is configured so that the coil 50 advances and retreats. However, the magnetic flux constituting the magnetic path is also generated around the winding 21. In the present invention, a magnetic path formed around the detection coil can be configured so that the holder advances and retreats.
Furthermore, the application of the rotation angle detection sensor according to the present invention is not limited to the detection of the opening degree of the throttle valve of the FI system.
また、第2実施形態は、検出する回転角度の範囲を0~90度の例を説明したが、本発明は、90度を超える回転角度を検出することができる。ただし、揺動部54と励磁コイル60の干渉を避ける必要があるので、検出できる最大の回転角度の範囲は0~180度になる。
また、本実施形態は、巻線21(ボビン23)の内部に形成される磁路25をコイル50が進退する構成としているが、磁路を構成する磁束は巻線21の周囲にも生じるので、本発明は検出コイルの周囲に形成される磁路をホルダが進退する構成にすることもできる。
さらに、本発明による回転角度検出センサの適用用途は、FIシステムのスロットルバルブの開度検出に限らない。 In the present embodiment, the method of specifying the position P ′ or the rotation angle θ of the detection target by detecting the induced electromotive force V has been described. However, the
In the second embodiment, an example in which the range of rotation angles to be detected is 0 to 90 degrees has been described. However, the present invention can detect rotation angles exceeding 90 degrees. However, since it is necessary to avoid interference between the
In the present embodiment, the
Furthermore, the application of the rotation angle detection sensor according to the present invention is not limited to the detection of the opening degree of the throttle valve of the FI system.
1 位置検出センサ
2 回転角度検出センサ
10,50 コイル
11,51 ホルダ
12,52 検出コイル
12a,52a 検出部
20,60 励磁コイル
21,61 巻線
23,63 ボビン
25,65 磁路
27 電源
30 検出器
40 スロットルバルブ
41 弁軸
43 弁体
45 電動アクチュエータ
51a 外周縁
51b 内周縁
51c 先端
51d 後端
53 挿入部
54 揺動部
55 回転軸
φ 磁束
V 誘導起電力
α,β 中心角
θ 回転角度 DESCRIPTION OFSYMBOLS 1 Position detection sensor 2 Rotation angle detection sensor 10, 50 Coil 11, 51 Holder 12, 52 Detection coil 12a, 52a Detection part 20, 60 Excitation coil 21, 61 Winding 23, 63 Bobbin 25, 65 Magnetic path 27 Power supply 30 Detection 40 Throttle valve 41 Valve shaft 43 Valve body 45 Electric actuator 51a Outer peripheral edge 51b Inner peripheral edge 51c Front end 51d Rear end 53 Insertion part 54 Swing part 55 Rotating shaft φ Magnetic flux V Induced electromotive force α, β Center angle θ Rotation angle
2 回転角度検出センサ
10,50 コイル
11,51 ホルダ
12,52 検出コイル
12a,52a 検出部
20,60 励磁コイル
21,61 巻線
23,63 ボビン
25,65 磁路
27 電源
30 検出器
40 スロットルバルブ
41 弁軸
43 弁体
45 電動アクチュエータ
51a 外周縁
51b 内周縁
51c 先端
51d 後端
53 挿入部
54 揺動部
55 回転軸
φ 磁束
V 誘導起電力
α,β 中心角
θ 回転角度 DESCRIPTION OF
Claims (4)
- 電線が巻き回される内側及び周囲に磁路が形成される、前記磁路が一方端から他方端に向けて狭くなる励磁コイルと、
前記一方端及び前記他方端のいずれか一方から前記磁路に挿入されるとともに、前記磁路内の移動経路を進退可能に支持され、前記励磁コイルが形成する磁場を受けて誘導起電力が生ずる検出コイルと、を備える、
ことを特徴とする位置検出センサ。 An excitation coil in which a magnetic path is formed on the inner side and the circumference around which the electric wire is wound, and the magnetic path becomes narrower from one end to the other end;
It is inserted into the magnetic path from one of the one end and the other end, and is supported so as to be able to move forward and backward in the magnetic path, and an induced electromotive force is generated by receiving a magnetic field formed by the exciting coil. A detection coil;
A position detection sensor characterized by that. - 前記磁路は、前記一方端から前記他方端に向けて、直線状に形成され、
直線状の前記移動経路を進退する前記検出コイルの位置を検出する、
請求項1に記載の位置検出センサ。 The magnetic path is formed linearly from the one end to the other end,
Detecting the position of the detection coil moving forward and backward in the linear movement path;
The position detection sensor according to claim 1. - 前記磁路は、前記一方端から前記他方端に向けて、円弧状に形成され、
円弧状の前記移動経路を進退する前記検出コイルの位置を検出する、
請求項1に記載の位置検出センサ。 The magnetic path is formed in an arc shape from the one end to the other end,
Detecting the position of the detection coil moving forward and backward along the arc-shaped movement path;
The position detection sensor according to claim 1. - 内燃機関において混合気の供給量を制御するスロットルバルブと、
前記スロットルバルブの開度を回転角度として検出する位置センサと、を備え、
前記位置センサは、請求項1~3のいずれか一項に記載の検出センサであることを特徴とする内燃機関のスロットル装置。 A throttle valve for controlling the supply amount of the air-fuel mixture in the internal combustion engine;
A position sensor for detecting the opening of the throttle valve as a rotation angle,
The throttle device for an internal combustion engine, wherein the position sensor is the detection sensor according to any one of claims 1 to 3.
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CN (1) | CN105612406B (en) |
WO (1) | WO2015056689A1 (en) |
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CN105241416B (en) * | 2015-11-19 | 2017-11-28 | 湖南天雁机械有限责任公司 | Turbine box deflation valve openness measuring device |
US10389195B2 (en) * | 2017-07-13 | 2019-08-20 | Rosemount Aerospace Inc. | Annular magnets for rotor position estimation |
US10551213B2 (en) * | 2017-12-15 | 2020-02-04 | Infineon Technologies Ag | Sickle-shaped magnet arrangement for angle detection |
CN115235333B (en) * | 2022-09-22 | 2022-12-02 | 徐州方达电机有限公司 | Main shaft dynamic eccentricity testing device based on induced current |
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JPH02112722A (en) * | 1988-10-21 | 1990-04-25 | Zenichiro Kojima | Length measuring device |
JPH043311U (en) * | 1990-04-20 | 1992-01-13 | ||
JP2004012308A (en) * | 2002-06-07 | 2004-01-15 | Smc Corp | Position measuring device utilizing coil, float type flowmeter, and method of measuring position |
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GB2115929B (en) * | 1982-02-17 | 1985-11-27 | Standard Telephones Cables Ltd | Inductive position transducer |
GB2202331B (en) * | 1987-03-19 | 1991-01-02 | British Gas Plc | Electromagnetic transducer |
CN1073205C (en) * | 1995-04-10 | 2001-10-17 | 西门子公司 | Process for finding mass of air entering cylinders of internal combustion engine with aid of model |
KR100446076B1 (en) * | 1995-11-30 | 2004-11-03 | 산요덴키가부시키가이샤 | Internal combustion engine unit and air conditioner using the same |
JP5270277B2 (en) * | 2008-09-16 | 2013-08-21 | 愛三工業株式会社 | Position sensor |
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2013
- 2013-10-18 JP JP2013217610A patent/JP2015080379A/en active Pending
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2014
- 2014-10-15 WO PCT/JP2014/077381 patent/WO2015056689A1/en active Application Filing
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JPH02112722A (en) * | 1988-10-21 | 1990-04-25 | Zenichiro Kojima | Length measuring device |
JPH043311U (en) * | 1990-04-20 | 1992-01-13 | ||
JP2004012308A (en) * | 2002-06-07 | 2004-01-15 | Smc Corp | Position measuring device utilizing coil, float type flowmeter, and method of measuring position |
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JP2015080379A (en) | 2015-04-23 |
CN105612406A (en) | 2016-05-25 |
CN105612406B (en) | 2018-08-21 |
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