JP2000130123A - Valve driving device and valve position detecting method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve driving device and a valve position detecting method using it for accurately and reliably detecting the valve position. SOLUTION: Since a ring-type sensor 90 is provided on the periphery of a taper part of an armature shaft 22, the valve position can be accurately and reliably detected by directly detecting the moving speed and the position of an armature 20 by this ring-type sensor 90. Voltage is applied to an upper coil 31, the moving speed and the position of the armature 20 are detected by the ring-type sensor 90, and correction for the upper coil voltage applying time or correction for the upper coil applied voltage is performed by feedback control on the basis of the detected signal output from the ring-type sensor 90. Therefore, the failure of attraction of the valve and a hard hit of the valve can be prevented. Accordingly, valve attraction is reliably performed, and the generation of hammering sound in valve closing can be reliably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine").
The present invention relates to a valve driving device that drives an intake valve or an exhaust valve of an “internal combustion engine” by an electromagnetic force and a valve position detecting method using the same.

[0002]

2. Description of the Related Art Conventionally, there has been known a valve driving device for driving an intake valve or an exhaust valve of an engine by electromagnetic force.

[0003] In such a valve drive device, the opening / closing timing of an intake valve or an exhaust valve is controlled so that intake or exhaust is properly performed in accordance with operating conditions of the engine, thereby improving engine stability and fuel efficiency. Or exhaust emissions can be reduced.

For example, when the load of the engine is low, the amount of intake air is small. Therefore, it is desirable that the amount of residual exhaust gas that deteriorates combustion in the cylinder of the engine is small. During a period in which the intake valve and the exhaust valve are simultaneously open (overlap period), the intake side is under negative pressure by the throttle,
Since the exhaust side has a positive pressure, the exhaust gas blows back to the intake side,
Combustion may worsen or misfire may occur. Therefore, it is required that the closing timing of the exhaust valve be early and the opening timing of the intake valve be late. Further, by delaying the closing timing of the intake valve, pumping loss can be reduced and fuel efficiency can be improved. Therefore, at the time of idling and starting, it is desirable to control the basic phase so that the closing timing of the exhaust valve is early and the opening timing of the intake valve is late.

[0005] When the engine has a medium load or more, E
To control the GR amount, reduce pumping loss by internal EGR, and improve fuel efficiency and reduce exhaust emissions, it is necessary to make the intake-side valve opening timing earlier or the exhaust-side valve closing timing later. desirable.

Further, at full engine load, a large amount of air needs to be introduced into the cylinder of the engine. Therefore, in the low speed range, the intake valve is closed early to prevent backflow to the manifold, and in the high speed range, air is It is desirable to close the intake valve late by using the inertia of the intake valve. Further, it is desirable that the exhaust side controls the exhaust valve to a phase in which exhaust pulsation can be used to the maximum.

[0007]

As described above, in order to control the intake valve or the exhaust valve to open and close at a desired timing, the open / close state of the intake valve or the exhaust valve, that is, the moving speed and the position of the valve body are required. Must be detected accurately.

In the valve driving device disclosed in Japanese Patent Application Laid-Open No. 2-173305, an electrode provided at a predetermined position on a valve shaft is detected by an electrode on a valve guide supporting the valve shaft, and the valve is driven. The valve position is detected by detecting the movement amount and speed of the shaft.

However, in the valve driving device disclosed in Japanese Patent Application Laid-Open No. 2-173305, it is necessary to embed a plurality of electrodes in the valve shaft and the valve guide, so that the structure becomes complicated, the number of processing steps increases, and the durability increases. There is a problem that it is difficult to improve the performance. Further, since the bearing portion of the valve guide has a delicate effect on the friction torque, there is a problem that if the shape is complicated, the operating characteristics of the valve change.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a valve driving device for accurately and reliably detecting a valve position and a valve position detecting method using the same. .

Another object of the present invention is to provide a valve driving device which can reduce manufacturing costs and improve durability with a simple structure. Still another object of the present invention is to provide a valve position detecting method for reducing occurrence of a tapping sound when a valve is closed.

[0012]

According to the valve driving device of the present invention, the shaft portion of the movable element can be brought into contact with the stem end of the valve body of the intake valve or the exhaust valve and can be separated from the stem end. Is provided, and detection means for detecting the moving speed and / or the position of the mover is provided around the shaft portion. Therefore, by directly detecting the moving speed and / or the position of the mover, the valve position can be accurately determined. And it can detect reliably. Furthermore, by incorporating a small and simple detecting means, a valve driving device having a simple structure can be obtained, and the manufacturing cost can be reduced and the durability can be improved.
Furthermore, since the shaft portion can be separated from the stem end of the valve body, it is possible to prevent the influence of a change in the length of the stem and the shaft portion of the valve body due to a temperature difference. Therefore, it is possible to prevent the intake valve or the exhaust valve from being unable to close due to thermal expansion or the like at a high temperature.

According to the valve drive device of the second aspect of the present invention, the shaft portion has a groove formed obliquely in the axial direction and made of a magnetic material, and the detecting means is provided around the groove. By using different depths in the axial direction of the groove, the valve position can be detected more reliably. Further, by using a ring-type sensor as the detecting means, a valve driving device having a very simple configuration can be obtained, and the manufacturing cost can be further reduced and the durability can be further improved.

According to the valve driving device of the third aspect of the present invention, since the shaft portion is made of a composite magnetic material, the detection is made by forming the groove portion with a ferromagnetic material and the other portion with a non-magnetic material. The noise component of the detection signal detected by the means can be reduced. Therefore, the valve position can be detected more accurately. Furthermore, since only the groove can be easily formed of a ferromagnetic material, the number of manufacturing steps can be reduced.

According to a fourth aspect of the present invention, there is provided a valve position detecting method using the valve driving device according to the first, second or third aspect, wherein a voltage is applied to the first coil portion. Then, the moving speed and / or position of the mover is detected by the detecting means, and the voltage applied to the first coil unit is feedback-controlled based on the detection signal output by the detecting means. For this reason, based on the detection signal output by the detecting means, for example, the applied voltage applied to the first coil unit, the applied time or the applied timing is feedback-controlled, so that the movable element main body is in close contact with the first stator. It is possible to prevent a valve suction failure that is not performed and a valve smash that causes the mover body to smash the first stator. Therefore, while the valve is reliably adsorbed,
It is possible to reduce the occurrence of a tapping sound when the valve is closed. further,
At high temperatures, if the length of the stem and shaft of the valve body changes due to thermal expansion, etc., the armature body performs a soft landing on the upper core by performing feedback control based on the detection signal output by the ring sensor. This makes it possible to prevent valve suction failure and valve bang. Furthermore, at a low temperature, even when the stem and the shaft portion of the valve body are thermally contracted, it is possible to reliably prevent the failure of the valve attraction.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIGS. 1 to 3 show a valve driving apparatus according to a first embodiment of the present invention. Valve drive device 1 of first embodiment
Reference numeral 00 denotes a valve driving device that drives an intake valve of the engine by electromagnetic force.

In a valve body 1 shown in FIG. 1, an intake port 3 for supplying fuel to a combustion chamber 2 of an engine is controlled to open and close at a predetermined timing. The valve body 1 is moved up and down in the axial direction by a stem 11 formed to extend toward a first spring accommodating chamber 40 formed in the engine block 4. Further, the valve body 1 is slidably held with respect to the engine block 4 by a valve guide 5 for guiding movement in the axial direction.

The first spring accommodating chamber 40 has a first
The first spring 41 and the spring seat 42 as the urging means are accommodated. First spring 41
Has one end in contact with the spring seat 42 and the other end in contact with the inner bottom surface 43 of the first spring storage chamber 40. The spring seat 42 is the stem 1 of the valve body 1.
The first spring 41 is fixed to the end of the first spring 41.
Urges the valve body 1 in the valve closing direction.

The housing 6 includes a first housing 61 having a substantially cylindrical shape and a second housing 62 having a substantially cylindrical shape.
And is fitted and fixed to the inner wall of the engine block 4 forming the first spring accommodating chamber 40.
Inside the housing 6, an armature 20 and a shaft 63
, An upper core 30 as a first stator, a lower core 50 as a second stator, a stopper 80, and a ring sensor 90 as detection means are accommodated.

The armature 20 comprises an armature body 21
And an armature shaft 22 as a shaft portion. The armature body 21 is disposed between the upper core 30 and the lower core 50, and is made of a disk-shaped magnetic material such as iron. One end of the armature shaft 22 is fitted and joined to a substantially central portion of the armature main body 21, and the other end can contact the end of the stem 11 of the valve body 1 via the shaft cap 23. Also, it can be separated from the end of the stem 11. The armature shaft 22 is made of a composite magnetic material, stainless steel, and is manufactured by a known method. As shown in FIG. 3, the armature shaft 22 has a tapered portion 22a as a groove made of a ferromagnetic material, and a cylindrical portion 22b on the armature main body 21 side and a cylindrical portion 22c on the valve body 1 side made of a non-magnetic material. The tapered portion 22a is formed obliquely in the axial direction. One end on the large diameter side is connected to the cylindrical portion 22b, and the other end on the small diameter side is connected to the cylindrical portion 22c. A ring sensor 90 is provided around the tapered portion 22a.

The shaft 63 has a flange 64 at one end and the armature shaft 2 at the other end.
2 and can be separated from one end of the armature shaft 22. Flange 64
Is in contact with the other end of a second spring 71 described later. Here, the armature 20 and the shaft 63 constitute a mover.

The upper core 30 includes a first housing 61
And is made of a magnetic material such as iron. An upper coil 31 as a first coil portion is wound inside the upper core 30. As shown in FIG.
The upper coil 31 is electrically connected to the coil driving means 110. When power is supplied from the coil driving means 110 to the upper coil 31, the upper coil 31 attracts the armature body 21 and moves the armature 20 and the shaft 63 in a direction in which the armature shaft 22 is separated from the end of the stem 11 of the valve body 1. Generates electromagnetic force.

The lower core 50 is housed in the second housing 62 and is disposed opposite to the upper core 30 with the armature main body 21 interposed therebetween. The lower core 50 is formed of a magnetic material such as iron. A lower coil 51 as a second coil unit is wound inside the lower core 50. As shown in FIG. 2, the lower coil 51 is electrically connected to the coil driving means 110. Coil driving means 1
When the lower coil 51 is energized from 10, the lower coil 5
1 generates an electromagnetic force that sucks the armature body 21 and moves the armature 20 and the shaft 63 in a direction in which the armature shaft 22 contacts the end of the stem 11 of the valve body 1. A stopper 80 is provided between the upper core 30 and the lower core 50, and the amount of movement of the armature 20 is restricted by the thickness of the stopper 80.

As shown in FIG. 3, the ring type sensor 90 is disposed around the tapered portion 22a of the armature shaft 22, and includes a coil portion 91 and a magnetic shield portion 92. As shown in FIG. 2, the ring sensor 90 is electrically connected to control means 120 having a microcomputer. The ring sensor 90 detects an eddy current generated in the tapered portion 22a when the coil portion 91 is energized, and outputs a voltage change corresponding to the eddy current change to the control means 120 when the eddy current changes. I do. When the coil portion 91 of the ring sensor 90 is energized, the tapered portion 22a generates a larger eddy current as the diameter increases, that is, as the distance from the coil portion 91 decreases, and the output voltage of the ring sensor 90 decreases. Become. Therefore, the output voltage of the ring sensor 90 changes according to the distance between the coil portion 91 and the tapered portion 22a. Therefore, the ring sensor 90 is configured to be able to detect the moving speed and the position of the armature 20.

As shown in FIG. 1, a spring cap 7 is fitted and fixed to an end of the housing 6 on the side opposite to the engine block. The spring cap 7 has a bottomed cylindrical shape, and an inner wall of the spring cap 7 forms a second spring accommodating chamber 70. In the second spring accommodating chamber 70, a second spring 71 as a second urging means and a flange portion 64 of the shaft 63 are accommodated. The second spring 71 is disposed to face the first spring 41 with the armature main body 21 interposed therebetween. The second spring 71 has one end in contact with the inner bottom surface 72 of the spring cap 7 and the other end in contact with the flange portion 64. Therefore, the second spring 71 is configured such that the shaft 63 is connected to the armature shaft 22.
The armature shaft 22 urges the shaft 63 in a direction in which the armature shaft 22 contacts the end of the stem 11 of the valve body 1, thereby urging the valve body 1 in the valve opening direction.

In the valve driving apparatus 100 having the above-described structure, when the upper coil 31 and the lower coil 51 are not energized, the armature main body 21 is connected to the upper core 30 and the lower core 5.
0 so that the first spring 41
The set load of the second spring 71 is adjusted. At this time, the valve body 1 is in a half-open state as shown in FIG. During the operation of the engine, the upper coil 31 and the lower coil 51 are connected to the coil driving means 110.
And the valve is repeatedly turned on and off.

Next, a valve position detecting method using the valve driving device 100 will be described with reference to FIG. 2 and FIGS. (1) For example, assuming that the control unit 120 shown in FIG. 2 issues an energization command to the coil driving unit 110 and the coil driving unit 110 applies a driving voltage to the lower coil 51, as shown in FIG. The main body 21 is held in close contact with the lower core 50 and is in a valve open state. At this time, the first
Assuming that the urging force of the spring 41 is Fs1, the urging force of the second spring 71 is Fs2, the attracting force by energizing the upper coil 31 is Fe1, and the attracting force by energizing the lower coil 51 is Fe2, the relationship of Fs2 + Fe2> Fs1 is satisfied. Holds.

(2) Next, the control means 120 shown in FIG. 2 temporarily stops the energization instruction to the coil driving means 110, and the lower coil 51 is de-energized. Thereafter, the control unit 120 issues an energization command to the coil driving unit 110 again, and in step S11 shown in FIG. 5, a driving voltage is applied from the coil driving unit 110 to the upper coil 31. At this time,
Since the first spring 41 is compressed and the drive voltage is applied to the upper coil 31, Fe 2
The relationship of + Fs1> Fs2 holds.

(3) Since the valve body 1, the armature 20, and the shaft 63 move upward from the state shown in FIG. 4A, in step S12 shown in FIG. 5, the moving speed and position of the armature 20 are shown in FIG. Detected by the ring type sensor 90 shown. Then, as shown in FIG. 4 (B), the valve body 1 is seated on the seat portion of the engine block 4 to be in a valve closed state. At this time, in step S13 shown in FIG. 5, the valve seating speed v is detected and compared with predetermined speeds v1 and v2 determined in advance. Here, there is a relationship v1 <v2. When v1 ≦ v ≦ v2, the armature shaft 22 is separated from the end of the stem 11 of the valve body 1, and Fs1 = 0. At this time, as shown in FIG. 6, the armature 20 and the shaft 63 sometimes have a moving speed of zero at the lift amount La. Then, the armature main body 21 is attracted by the upper coil 31, and when the lift amount Lb shown in FIG.
As shown in FIG. 4 (C), it is held in close contact with the upper core 30. Thereafter, the shaft 63 vibrates for a while due to the inertial force. In FIG. 4C, assuming that the distance between the end of the armature shaft 22 on the valve body 1 side and the end of the stem 11 of the valve body 1, that is, so-called valve clearance, is d, L = Lb-La. One.

When v ≦ v 1, as shown in FIG. 7, the armature main body 21 may not be held in close contact with the upper core 30, which is a so-called valve suction failure state. Therefore, in step S14 shown in FIG. 5, the upper coil voltage application time correction for increasing the application time of the drive voltage applied from the coil drive unit 110 to the upper coil 31 or the drive voltage applied to the upper coil 31 from the coil drive unit 110 is The voltage applied to the upper coil to be increased is corrected. And
The armature body 21 is attracted by the upper coil 31 and can come into close contact with the upper core 30.

Further, when v ≧ v2, as shown in FIG. 8, there is a possibility that the armature body 21 hits the upper core 30 in a so-called valve hit state. Therefore, in step S14 shown in FIG. 5, the upper coil voltage application time correction for reducing the application time of the drive voltage applied to the upper coil 31 from the coil driving unit 110 or the driving voltage applied to the upper coil 31 from the coil driving unit 110 is The voltage applied to the upper coil to be reduced is corrected. Then, the armature main body 21 can perform a soft landing on the upper core 30. In FIGS. 6, 7 and 8, the drive voltages applied from the coil drive means 110 to the upper coil 31 have the same applied voltage and different application times.

Next, a comparative example 1 in which the ring type sensor 90 of the first embodiment shown in FIG. 2 is provided around the stem 11 of the valve body 1 is shown in FIG. FIG. 11 shows a comparative example 2 in which the ring type sensor 90 of the first embodiment shown in FIG. 2 is provided around the shaft 63. In FIGS. 10 and 11, the same components as those of the first embodiment shown in FIG. 2 are denoted by the same reference numerals.

In Comparative Example 1 shown in FIG. 10, since the ring type sensor 190 is provided around the stem 11 of the valve body 1, the moving speed and the position of the valve body 1 are detected by the ring type sensor 190. Therefore, the behavior of the armature 20 after the valve body 1 is seated on the seat portion of the engine block cannot be grasped. Therefore, it is impossible to prevent the failure of the valve attraction and the blow of the valve.

In Comparative Example 2 shown in FIG.
Since the ring-type sensor 290 is provided around the shaft 63, the ring-type sensor 290
Detect the moving speed and position of The shaft 63 vibrates for a while due to the inertial force after the armature main body 21 is held in close contact with the upper core 30. For this reason, the detection signal output from the ring sensor 290 overshoots, and the position when the armature body 21 comes into close contact with the upper core 30 cannot be accurately grasped. Therefore, the valve position cannot be accurately detected.

On the other hand, in the first embodiment, the tapered portion 22a made of a ferromagnetic material is formed obliquely in the axial direction of the armature shaft 22, and the ring type sensor 90 is provided around the tapered portion 22a. Ring type sensor 9
By directly detecting the moving speed and the position of the armature 20 using 0, the valve position can be accurately and reliably detected.

Further, in the first embodiment, a voltage is applied to the upper coil 31, the moving speed and the position of the armature 20 are detected by the ring sensor 90, and feedback control is performed based on a detection signal output from the ring sensor 90. Then, the upper coil voltage application time correction for changing the application time of the voltage applied to the upper coil 31 or the upper coil application voltage correction for changing the magnitude of the voltage applied to the upper coil 31 is performed. For this reason, valve suction failure in which the armature main body 21 is not in close contact with the upper core 30,
Further, it is possible to prevent the armature main body 21 from hitting the upper core 30 with a valve. Therefore, valve suction can be reliably performed, and occurrence of a tapping sound when the valve is closed can be reliably reduced.

Further, in the first embodiment, by using the ring type sensor 90, it is possible to obtain the valve driving device 100 having an extremely simple structure, to reduce the manufacturing cost and to improve the durability. Can be.

Further, in the first embodiment, since the armature shaft 22 can be separated from the end of the stem 11 of the valve body 1, the influence of the temperature difference on the length of the stem 11 and the armature shaft 22 is prevented. be able to. Therefore, it is possible to prevent the intake valve from being unable to close due to thermal expansion at a high temperature.

(Second Embodiment) A valve position detecting method according to a second embodiment of the present invention will be described with reference to FIG. The second embodiment shown in FIG. 9 shows a case where the length of the stem 11 and the armature shaft 22 of the valve body 1 of the first embodiment shown in FIG. In the valve position detecting method according to the first embodiment, the valve driving device of the second embodiment has the same configuration as the valve driving device 100 of the first embodiment shown in FIG. Also, the same steps as those of the valve position detecting method of the first embodiment shown in FIG.

In step S11 shown in FIG. 9, a drive voltage is applied from the coil driving means to the upper coil, and in step S12, the moving speed and position of the armature are detected by a ring sensor. Then, in step S23, the position of the tapered portion when the armature main body is sucked and brought into close contact with the upper core, that is, the armature catch position L is detected and compared with predetermined positions L1 and L2 determined in advance. Here, there is a relationship of L1 <L2. When L1 ≦ L ≦ L2, the armature body performs a soft landing on the upper core.

When L.ltoreq.L1, there is a possibility that the armature main body is not held in close contact with the upper core, that is, a so-called valve suction failure state occurs.
Therefore, in step S14 shown in FIG. 9, the upper coil voltage application time correction for increasing the application time of the drive voltage applied to the upper coil from the coil driving means, or the upper coil application for increasing the drive voltage applied to the upper coil from the coil driving means. Perform voltage correction. Then, the armature body is attracted by the upper coil and can be brought into close contact with the upper core.

Further, when L.gtoreq.L2, the armature body may hit the upper core in a so-called valve hit state. Therefore, FIG.
In step S14 shown in (1), an upper coil voltage application time correction for reducing the application time of the drive voltage applied to the upper coil from the coil driving means, or an upper coil application voltage correction for reducing the drive voltage applied to the upper coil from the coil driving means is performed. . Then, the armature main body can perform soft landing on the upper core.

Further, when the stem and the shaft of the valve body are thermally contracted at a low temperature, the failure of valve suction can be reliably prevented by performing the same feedback control as described above.

In the second embodiment, when the valve clearance changes due to thermal expansion or the like, the voltage applied to the upper coil is feedback-controlled based on the detection signal output from the ring type sensor, so that the armature main body is soft-connected to the upper core. Landing can be performed. Therefore, it is possible to reliably prevent the failure of the valve attraction and the blow of the valve.

In the embodiments of the present invention described above,
The valve position detection method for correcting the upper coil voltage application time or the upper coil voltage correction based on the detection signal output from the ring sensor has been described. In the present invention, however, the upper coil is detected based on the detection signal output from the ring sensor. It is also possible to perform upper coil voltage application timing correction for changing the application timing of the voltage applied to the power supply. Further, by performing feedback control of the voltage applied to the upper coil by arbitrarily combining the upper coil voltage application time correction, the upper coil application voltage correction, and the upper coil voltage application timing correction, it is possible to more reliably prevent the failure of the valve suction and the valve bang. .

In the above embodiments, the present invention is applied to the valve driving device that drives the intake valve by electromagnetic force. However, it is needless to say that the present invention can be applied to the valve driving device that drives the exhaust valve by electromagnetic force. Absent.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a valve driving device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a valve driving device according to a first embodiment of the present invention.

FIG. 3 is an enlarged view of a part III in FIG. 2;

FIG. 4 (A), (B) and (C) show the first embodiment of the present invention.
It is a figure for explaining operation of a valve drive by an example.

FIG. 5 is a flowchart for explaining a valve position detecting method according to the first embodiment of the present invention.

FIG. 6 is a characteristic diagram for explaining a valve position detecting method according to the first embodiment of the present invention.

FIG. 7 is a characteristic diagram for explaining the valve position detecting method according to the first embodiment of the present invention.

FIG. 8 is a characteristic diagram for explaining a valve position detecting method according to the first embodiment of the present invention.

FIG. 9 is a flowchart for explaining a valve position detecting method according to a second embodiment of the present invention.

FIG. 10 is a block diagram showing a valve driving device of Comparative Example 1.

FIG. 11 is a block diagram showing a valve driving device of Comparative Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 4 Engine block 6 Housing 11 Stem 20 Armature (movable element) 21 Armature main body 22 Armature shaft (Shaft part) 22a Taper part (Groove part) 30 Upper core (First stator) 31 Upper coil (First coil part) 41 1st spring (1st biasing means) 50 lower core (2nd stator) 51 lower coil (2nd coil part) 63 shaft (movable element) 71 2nd spring (2nd biasing means) 90 ring type sensor (detection means) 100 valve driving device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3G092 AA11 DA07 DG02 DG09 FA06 FA12 FA13 FA14 FA50 HA13X HA13Z 3H065 AA01 BA01 BA04 BB16 BC13

Claims (4)

[Claims] 1. A mover having a shaft portion provided on a stem end of a valve body of an intake valve or an exhaust valve of an internal combustion engine and detachable from the stem end, and a mover having a main body made of a magnetic material; And a first stator having a first coil portion that generates an electromagnetic force for moving the mover in a direction in which the shaft portion moves away from the stem end by sucking the first portion. A second fixed portion disposed opposite to a stator and having a second coil portion that generates an electromagnetic force for attracting the main body and moving the mover in a direction in which the shaft portion contacts the stem end; A first urging means for urging the valve body in a valve closing direction; a first urging means disposed to face the first urging means with the main body interposed therebetween; Possible in the contact direction Second urging means for urging the valve body in the valve opening direction by urging the armature, and detecting the movement speed and / or position of the mover provided around the shaft portion. Means, and a valve driving device. 2. The valve according to claim 1, wherein the shaft portion has a groove formed obliquely in the axial direction and made of a magnetic material, and the detecting means is provided around the groove. Drive. 3. The valve driving device according to claim 2, wherein the shaft portion is made of a composite magnetic material. 4. A valve position detecting method using the valve driving device according to claim 1, wherein a voltage is applied to the first coil portion, and a voltage of the movable element is detected by the detecting means. A step of detecting a moving speed and / or a position; and a step of performing feedback control of a voltage applied to the first coil unit based on a detection signal output by the detection unit. Method.