JP2010151002A - Electromagnetic solenoid device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load on a movable member, when an electromagnetic solenoid device is held in an energized state. <P>SOLUTION: In the electromagnetic solenoid device used as an actuator for operating a valve opening property changing section changing a valve opening property of an intake valve or an exhaust valve of an internal combustion engine, a fixed member, and the movable member which can be displaced in an axial direction are disposed. A solenoid coil is set to generate an electromagnetic force displacing the movable member in a first direction, where the movable member is attracted to the fixed member due to excitation by the energization. Further, a pin member connected to the movable member is disposed to be connected to the valve opening property changing section and to be interlocked with the movable member and displaced in the axial direction. A coil spring generating a biasing force pressing the pin member in a second direction opposite to the first direction, and generating the electromagnetic force displacing the pin member in the first direction due to the excitation by the energization, is disposed around the pin member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic solenoid device. More specifically, the present invention relates to an electromagnetic solenoid device used as an actuator for operating a valve opening characteristic changing unit that changes a valve opening characteristic of an intake valve or an exhaust valve of an internal combustion engine.

  Conventionally, a variable valve mechanism changes the open / close characteristics of the intake / exhaust valves of the internal combustion engine, such as the phase, operating angle, and lift amount, or stops the cylinder by fixing the intake / exhaust valves in a closed state. It has been known. For example, Patent Document 1 discloses a technique that uses an electromagnetic solenoid device as an actuator of a variable valve mechanism that changes and maintains the valve opening characteristics of the intake and exhaust valves. In this prior art, the opening and closing characteristics of the intake and exhaust valves are switched by displacing the movable member (needle) of the electromagnetic solenoid device, and the opening and closing characteristics of the intake and exhaust valves are maintained by holding the movable member in that position. Holding.

JP-A 61-226510 JP 2003-197423 A

  By the way, in such a mechanism that uses the electromagnetic solenoid device to maintain the valve opening characteristics of the intake and exhaust valves, there is a case where continuous energization is required for the electromagnetic solenoid device. Here, during energization, the load is increased because both the urging force of the return spring and the attractive force of the solenoid coil are applied to the movable member of the electromagnetic solenoid device. For this reason, when it keeps in the state which continued energization, the state to which the big load was applied to the movable member will continue, and the situation which may accelerate deterioration by deformation | transformation, abrasion, etc. of a movable member may arise.

  In order to solve the above-described problems, an object of the present invention is to provide an electromagnetic solenoid device improved to reduce a load applied to a movable member during energization.

In order to achieve the above object, a first invention is an electromagnetic solenoid device used as an actuator for operating a valve opening characteristic changing unit that changes a valve opening characteristic of an intake valve or an exhaust valve of an internal combustion engine,
A fixing member;
A movable member arranged to be axially displaceable,
A solenoid coil that generates an electromagnetic force that displaces the movable member in a first direction that attracts the movable member and the fixed member by excitation by energization;
A pin member connected to the valve-opening characteristic changing unit, coupled to the movable member, and arranged to be displaced in the axial direction in conjunction with the movable member;
An electromagnetic force that is disposed around the pin member and generates a biasing force that pushes the pin member in a second direction opposite to the first direction, and displaces the pin member in the first direction by excitation by energization. A coil spring that produces
It is characterized by providing.

According to a second invention, in the first invention,
Failure detection means for detecting failure of the solenoid coil;
Energization timing setting means for setting the energization timing to the coil spring when a failure of the solenoid coil is detected;
Energization control means for energizing the coil spring according to the energization timing when a failure of the solenoid coil is detected;
Is further provided.

According to a third invention, in the second invention,
The energization timing setting means includes a response of displacement of the movable member when the solenoid coil is switched from non-energization to energization, and a response of displacement of the pin member when the coil spring is switched from non-energization to energization. The energization timing is set in accordance with the difference between and.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the coil spring has a barrel shape in which the outer diameter of the coil is maximum at the central portion in the axial direction and decreases toward both ends in the axial direction. Features.

  According to a fifth invention, in any one of the first to fourth inventions, the coil spring is configured such that a coil wire constituting the coil spring is doubled or more in a cross-sectional direction perpendicular to the axial direction. It is characterized by being.

  According to a sixth invention, in any one of the first to fifth inventions, the coil spring includes a copper wire in a coil wire constituting the coil spring.

A seventh invention is the invention according to any one of the first to sixth inventions,
At least a part of the pin member is a magnetic body,
Induced voltage detection means for detecting an induced voltage induced in the coil spring when the pin member is displaced;
Position detecting means for detecting the position of the movable member according to the detected induced voltage;
Is further provided.

An eighth invention is an electromagnetic solenoid device used as an actuator for operating a valve opening characteristic changing unit that changes the valve opening characteristic of an intake valve or an exhaust valve of an internal combustion engine,
A fixing member;
A movable member arranged to be axially displaceable,
A solenoid coil that generates an electromagnetic force that displaces the movable member in a first direction that attracts the movable member and the fixed member by excitation by energization;
A pin member connected to the valve-opening characteristic changing unit, coupled to the movable member, and arranged to be displaced in the axial direction in conjunction with the movable member;
A coil spring that is arranged around the pin member and generates a biasing force that pushes the pin member in a second direction opposite to the first direction;
Induced voltage detection means for detecting an induced voltage induced in the coil spring when the pin member is displaced;
Position detecting means for detecting the position of the movable member according to the detected induced voltage;
Is further provided.

  According to the first invention, the movable member is drawn toward the fixed member side by excitation of the solenoid coil. In addition, an electromagnetic force that displaces the pin member in the same direction as the displacement of the movable member can be generated by energizing the coil spring. Thereby, the responsiveness and retention of an electromagnetic solenoid device can be improved.

  More specifically, for example, when holding the movable member in an energized state, the pin member can be held by electromagnetic force by simultaneously energizing the coil spring, and the load on the movable member can be reduced. Further, since the movable member and the pin member can be held in an energized state by the electromagnetic force of both the solenoid coil and the coil spring, the power to the solenoid coil during energization can be reduced. Therefore, the influence of the residual magnetic field when switching from energization to non-energization can be reduced, and the responsiveness when switching to non-energization can be improved.

  According to the second or third invention, when the solenoid coil fails, the pin member is displaced by controlling energization / non-energization to the coil spring, and the movable member connected to the pin member is simultaneously displaced. be able to. At this time, energization is controlled according to the energization timing to the coil spring at the time of failure. Therefore, for example, even if the response of displacement of the pin member and the movable member due to energization of the coil spring is different from the response of displacement of the movable member due to energization of the solenoid coil, the difference in response is corrected. Thus, the electromagnetic solenoid device can be controlled with a certain degree of accuracy by the coil spring.

  According to any one of the fourth to sixth inventions, the electromagnetic force generated by the coil spring can be increased by increasing the number of turns of the coil wire of the coil spring or improving the electrical conductivity.

  According to the seventh or eighth invention, at least a part of the pin member is made of a magnetic material. As a result, an induced voltage is generated in the coil spring when the pin member is displaced, but the induced voltage varies depending on the direction of displacement of the pin member. Therefore, the direction of the displacement can be detected by detecting the induced voltage induced in the coil spring. Therefore, the position of the movable member that is interlocked with the pin member can be detected.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is simplified or omitted.

Embodiment 1 FIG.
FIG. 1 is a diagram for explaining the configuration of the electromagnetic solenoid device according to the first embodiment of the present invention. The electromagnetic solenoid device 2 shown in FIG. 1 is connected to a valve opening characteristic changing portion (not shown) of a variable valve mechanism that switches between stop / return of an intake valve of an internal combustion engine and maintains the state, and operates it. Or, it is used as an actuator for maintaining the state.

  The electromagnetic solenoid device 2 shown in FIG. 1 has a fixed member 10 that functions as a fixed iron core and a movable member 12 as an output shaft. The fixed member 10 and the movable member 12 have opposing surfaces 10a and 12a perpendicular to the axial direction facing each other. Further, a guide hole penetrating in the axial direction is formed in the fixing member 10. A part of the movable part is slidably inserted into the guide hole of the fixed member 10. Thereby, the movable member 12 is movable in the axial direction (AA ′ line direction in FIG. 1). A solenoid coil 14 is installed around the movable member 12. Electric power is supplied to the solenoid coil 14 from outside by a circuit (not shown).

  The movable member 12 is connected to a lock pin 16 (pin member) at the end portion in the axial direction of the portion inserted into the fixed member 10. A housing 18 is installed around the lock pin 16. The lock pin 16 is slidably inserted into a guide hole penetrating in the axial direction near the center of the housing 18.

  A return spring 20 (coil spring) is disposed in a space 18 a surrounded by the housing 18. The return spring 20 is disposed around the lock pin 16, and is in contact with the wall surface of the space 18 a of the housing 18 at one end and is in contact with the surface 16 a that protrudes perpendicular to the axial direction of the lock pin 16. The return spring 20 is disposed so as to bias the surface 16a of the lock pin 16 in the direction of the fixing member 10 (second direction) along the axial direction. The return spring 20 is supplied with electric power from the outside by a circuit (not shown).

  The lock pin 16 is engaged with the slide pin 22 at the end opposite to the side connected to the movable member 12 in the axial direction. The slide pin 22 moves in accordance with the displacement of the lock pin 16 and thereby operates the valve opening characteristic changing unit.

  The system of the first embodiment has a control device (not shown). The control device is connected to various sensors installed in the internal combustion engine and the electromagnetic solenoid device 2 and receives input of information related to the operation state of the internal combustion engine and the electromagnetic solenoid device 2, and for example, the solenoid coil 14 and the return spring 20 A signal for controlling ON / OFF (energization / non-energization) of the current supply to is issued.

  In the electromagnetic solenoid device 2 configured as described above, the lock pin 16 is urged in the second direction by the return spring 20, and the movable member 12 is also pushed in the second direction. Therefore, when the solenoid coil 14 is not energized, the movable member 12 is in a position where the opposed surfaces 10a and 12a of the movable member 12 and the fixed member 10 are separated.

  On the other hand, when the solenoid coil 14 is energized, an attractive force that attracts the movable member 12 in the direction of attracting the opposing surfaces 10a and 12a, that is, in the first direction, acts. The return spring 20 is a coil spring, and the return spring 20 can be supplied with electric power from the outside. In this system, when the solenoid coil 14 is kept energized, power is also supplied to the return spring 20. As a result, a suction force acts between the surface 16 a of the lock pin 16 and the housing surface 18 b by excitation of the return spring 20, and the return spring 20 is pushed back in the first direction.

  Thereby, at the time of energization, both the movable member 12 and the lock pin 16 are attracted in the first direction by the electromagnetic force generated by the solenoid coil 14 and the electromagnetic force generated by the return spring 20. This electromagnetic force is set in advance so as to be larger than that of the return spring 20. Therefore, the movable member 12 is in a position where the opposing surfaces 10a and 12a are in contact with each other, and the lock pin 16 also pushes the return spring 20 back to contact the surface 18b in the space 18a and the surface 16a of the lock pin 16. Is held in contact.

  As described above, when the energization and de-energization of the solenoid coil 14 and the return spring 20 are switched, the movable member 12 and the lock pin 16 move, and the slide pin 22 moves accordingly. Specifically, when the lock pin 16 is attracted in the first direction, the slide pin 22 is also pushed in the first direction and is inserted into a cam groove (not shown). As a result, the predetermined intake valve of the internal combustion engine is stopped. On the other hand, when the lock pin 16 is pushed in the second direction by the return spring 20 when deenergized, the slide pin 22 is removed from the cam groove and returned to the original position, and as a result, the intake valve is restored. That is, in this system, when the solenoid coil 14 is energized, the predetermined intake valve is stopped, and when the solenoid coil 14 is de-energized, the intake valve is restored.

  Here, for example, in order to maintain a predetermined intake valve in a stopped state, it is necessary to maintain the electromagnetic solenoid device 2 in an energized state. However, in this embodiment, each of the movable iron core 12 and the lock pin 16 is attracted by energizing the return spring 20 together with the solenoid coil 14. Therefore, the load applied to the movable member 12 can be reduced as compared with the conventional case in which the lock pin 16 is also displaced and maintained only by the displacement of the movable member 12 by energization control of the solenoid coil 14.

  Further, the duty ratio is largely caused by the response of the return of the intake valve, that is, the response of the movable member 12 when switching from energization to non-energization. When the duty ratio at the time of energization is high, the effect of the residual magnetization is large, so the response is slow. In this regard, according to the first embodiment, when energized (that is, when the intake valve is stopped), the solenoid coil 14 and the return spring 20 are held by the electromagnetic force of both. Duty ratio can be kept small. Therefore, the responsiveness at the time of valve return can be improved.

  In the first embodiment, the electromagnetic solenoid device 2 is used as an actuator for the valve opening characteristic changing portion of the variable valve mechanism by engaging the lock pin 16 of the electromagnetic solenoid device 2 with the slide pin 22. explained. However, the present invention is not limited to this, and can be widely used as an actuator or the like in a mechanism for changing the opening / closing characteristics of other internal combustion engines.

Embodiment 2. FIG.
The electromagnetic solenoid device 2 and its peripheral devices in the second embodiment have the same configuration as the electromagnetic solenoid device in FIG. Also in the second embodiment, when the intake valve is stopped, the solenoid coil 14 is energized and the return spring 20 is energized to attract both the movable member 12 and the lock pin 16. The burden on the movable member 12 is reduced. The system of the second embodiment is different from the system of the first embodiment in that the electromagnetic solenoid device 2 functions only by excitation by the return spring 20 when it is detected that the solenoid coil 14 has failed.

  Here, in the system of the second embodiment, the response of control of the intake valve when the solenoid coil 14 is used is different from the response of control of the intake valve using only the return spring 20. FIG. 2 is a graph for explaining the timing of switching the power supply to the return spring 20 or the solenoid coil 14 from the non-energized state to the energized state in this system. In FIG. 2, the horizontal axis represents time.

  In FIG. 2, the response time T1 is that the solenoid coil 14 and the return spring 20 are simultaneously switched from non-energized to energized, then the movable member 12 and the lock pin 16 are sucked, the slide pin 22 moves, and the intake valve stops. Shows the time until. On the other hand, the response time T2 indicates the time from when the slide pin 22 moves and the intake valve stops when the solenoid coil 14 is in a non-energized state and the return spring 20 is switched from non-energized to energized. . That is, the response time T2 is a response time when the electromagnetic solenoid device 2 is operated only by the return spring 20.

  As shown in FIG. 2, the response time T2 due to the return spring 20 alone is longer than the response time T1 when the solenoid coil 14 is used. Therefore, when the electromagnetic solenoid device 2 is operated only by the return spring 20 due to the failure of the solenoid coil 14, the response time difference (T2-T1) is earlier than the energization timing when the solenoid coil 14 is used (ON at the time of failure) The timing is switched so that the energization of the return spring 20 is turned on. Thereby, control which stops an intake valve at the same timing as the case where the electromagnetic solenoid apparatus 2 is normal is attained.

  The actual response varies depending on various factors such as the configuration of the solenoid coil 14 and the return spring 20, or the movable member 12 and the lock pin 16, the configuration of the slide pin 22 and the intake valve. Therefore, an ON timing at the time of failure, which is obtained by experiment or the like for each electromagnetic solenoid device using the system and corrects the difference in response, is stored in the control device in advance.

  FIG. 3 is a flowchart for illustrating a control routine executed by the control device in Embodiment 2 of the present invention. The routine shown in FIG. 3 is a routine that is repeatedly executed at regular intervals.

  In the routine of FIG. 3, it is first determined whether or not there is a failure in the solenoid coil 14 (S2). The failure of the solenoid coil 14 is detected by monitoring the voltage and current of the solenoid coil 14. Next, when a failure of the solenoid coil 14 is detected, the energization of the solenoid coil 14 is turned off (S4). Next, the timing of energizing the return spring 20 is changed to the ON timing at the time of failure (S6). Thereafter, control is performed so that the return spring 20 is energized at the set failure ON timing.

  As described above, according to the second embodiment, the electromagnetic solenoid device 2 can be operated by energizing the return spring 20 even when the solenoid coil 14 fails. In addition, the response can be improved by setting the energization timing to the return spring 20 to the ON timing at the time of failure earlier than usual.

  Here, when the intake valve is stopped, fuel cut control may be executed at the same time. Therefore, when there is a control delay in stopping the intake valve, the intake air is taken in as in the case of the return of the intake valve even though the fuel injection is stopped. Can occur. In this regard, according to the system of the second embodiment, the response of the electromagnetic solenoid device 2 is controlled in the same way as the response when the solenoid coil 14 is normal, so that the intake valve control is also normal. It can be controlled with the same responsiveness as time. Therefore, more stable air-fuel ratio control can be realized.

  In the second embodiment, the case where the ON timing at the time of failure is set earlier than usual has been described. However, the present invention is not limited to this, and it may simply be switched to the operation by the return spring 20 by stopping energization of the solenoid coil 14. Thus, even if the current is simply switched between energization / non-energization by the return spring 20, it is possible to prevent a situation in which the valve is not stopped even though the fuel is cut. Moreover, the ON timing at the time of failure is not limited to an early timing that completely compensates for the difference in response time (T2-T1), and can be set as appropriate.

  In the routine of FIG. 3, the “failure detection means” of the present invention is realized by executing step 2, and the “energization timing setting means” is realized by executing step S6. The “energization control means” is realized by controlling the energization of the return spring 20 at the ON timing.

Embodiment 3 FIG.
The third embodiment has the same configuration as the system of the first embodiment except that the shape of the return spring is different. FIG. 4 is a schematic cross-sectional view for explaining the shape of the return spring 120 according to Embodiment 3 of the present invention. FIG. 4 shows a non-energized state, that is, a state where the return spring 120 is not pushed back by the lock pin 16.

  As shown in FIG. 4, the return spring 120 is configured such that the cross-sectional shape along the axial direction has a barrel shape. In other words, the outer diameter of the coil of the return spring 120, that is, the diameter of the cross section of the coil perpendicular to the axial direction is maximized at the central portion in the axial direction of the coil, and the diameter of the cross section is reduced toward both ends in the axial direction. Has been.

  Thus, by making the return spring 120 into a barrel shape, the number of turns of the coil wire of the return spring 120 can be increased. Therefore, the electromagnetic force generated by the excitation of the return spring 20 can be increased, the lock pin 16 can be attracted with a larger force when the intake valve is stopped, and the stopped state can be stably maintained. Thereby, for example, as in the second embodiment, it is possible to suppress a response delay when the electromagnetic solenoid device 2 is operated only by excitation by the return spring 120 at the time of failure.

  In addition, in Embodiment 3, the case where the return spring 120 was comprised by the barrel shape was demonstrated. However, the present invention is not limited to this and may have other shapes. 5 and 6 are schematic cross-sectional views for explaining another example of the shape of the return spring.

  In the example of FIG. 5, the return spring 220 is wound so that the coil wire is double or more in a cross section perpendicular to the axial direction. Even in this case, since the number of turns of the coil wire of the return spring 220 can be increased, the attractive force by the return spring 220 during energization can be increased.

  In the example of FIG. 6, the coil wire of the return spring 320 is configured to have a copper wire 322 inside. Thereby, the electrical conductivity can be increased. Therefore, a relatively large suction force can be ensured even with the same number of turns.

  Moreover, the shape of the return spring is not limited to the examples of FIGS. 4 to 6, and the number of turns in the same space 18 b is increased or the electrical conductivity is increased depending on other shapes. This is effective in making the suction force relatively large. Note that the return spring described in the third embodiment can be used in place of the return spring 20 of the other embodiments in this specification.

Embodiment 4 FIG.
The electromagnetic solenoid device 2 of the fourth embodiment has the same configuration as the electromagnetic solenoid device of FIG. 1 except that the lock pin 16 is formed of a magnetic material. Similarly to the system of the first embodiment, the electromagnetic solenoid device 2 of the fourth embodiment performs control for attracting the lock pin 16 by flowing a current through the return spring 20 when the intake valve is stopped. Further, in the system of the fourth embodiment, by detecting the induced voltage generated in the lock pin 16, it is detected whether the lock pin 16 is in the valve stop position or the valve return position.

  FIG. 7 shows the movement of the lock pin 16 when the intake valve is stopped in Embodiment 4 of the present invention, and FIG. 8 shows the induced voltage generated in the return spring 20 when the intake valve is stopped. On the other hand, FIG. 9 shows the movement of the lock pin 16 when the intake valve is returned, and FIG. 10 shows the induced voltage generated when the valve is returned.

  As shown in FIGS. 8 and 10, there is a return in the case of switching from the valve return state (non-energized) to the valve stop state (energized) and in the opposite case of switching from valve stop to valve return. The voltage induced in the spring 20 is reversed. 8 and 10 show the voltage induced in the return spring 20 when no voltage is applied to the return spring 20 from the outside. However, even when the return spring 20 is energized, an induced voltage is generated separately from the energization, and the induced voltage differs between when the valve is returned and when the valve is stopped.

  The system includes a voltmeter (not shown) that generates an output corresponding to the voltage of the return spring 20. The control device can detect the induced voltage generated in the return spring 20 based on the output of the voltmeter, and accordingly detects whether the intake valve is in a stopped state or an intake valve return state. can do.

  Thereby, according to the system of the fourth embodiment, the current state of the intake valve can be accurately grasped. For example, when the solenoid coil 14 is out of order, the position of the movable member 12 cannot be accurately grasped by feeding back an energization / non-energization control command to the solenoid coil 14. Even in such a case, in the fourth embodiment, the position of the movable member 12 can be detected by the actual movement of the lock pin 16 and the state of the intake valve can be accurately grasped.

  In the fourth embodiment, the case of determining whether the intake valve returns or stops has been described. However, the present invention is not limited to this, and it is necessary to grasp the positions of the movable member 12 and the lock pin 16. It is effective for.

  Further, in the fourth embodiment, as in the first to third embodiments, the case where the return spring 20 is energized and the lock pin 16 is sucked when the valve is stopped has been described. However, the present invention is not limited to the case where the return spring 20 is energized. For example, there may be no means for energizing the return spring 20 and simply detecting an induced voltage generated in the return spring 20 when the lock pin 16 is moved. This is also effective for detecting the positions of the lock pin 16 and the movable member 12 and detecting the state of the intake valve.

  In the fourth embodiment, the “induced voltage detection means” is realized by detecting the induced voltage based on the output of the voltmeter, and the position of the movable member is detected according to the induced voltage. "Position detection means" is realized.

  In addition, in other parts, in this embodiment, when the number of each element, quantity, quantity, range, etc. is mentioned, unless otherwise specified or clearly specified in principle. Thus, the present invention is not limited to the number mentioned. Further, the structure, steps in the method, and the like described in this embodiment are not necessarily essential to the present invention unless otherwise specified or clearly specified in principle.

It is a figure for demonstrating the structure of the electromagnetic solenoid apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the responsiveness of the electromagnetic solenoid apparatus in Embodiment 2 of this invention. It is a figure for demonstrating the routine of control which a control apparatus performs in Embodiment 2 of this invention. It is a figure for demonstrating the return spring of the electromagnetic solenoid apparatus in Embodiment 3 of this invention. It is a figure for demonstrating the example of the other return spring in Embodiment 3 of this invention. It is a figure for demonstrating the example of the other return spring in Embodiment 3 of this invention. It is a figure for demonstrating the operation | movement at the time of the valve stop in Embodiment 4 of this invention. It is a figure for demonstrating the induced voltage which generate | occur | produces at the time of the valve stop in Embodiment 4 of this invention. It is a figure for demonstrating the operation | movement at the time of the valve return in Embodiment 4 of this invention. It is a figure for demonstrating the induced voltage which generate | occur | produces at the time of the valve return in Embodiment 4 of this invention.

Explanation of symbols

2 Electromagnetic Solenoid Device 10 Fixed Member 12 Movable Member 14 Solenoid Coil 16 Lock Pin 18 Housing 20 Return Spring 22 Slide Pin

Claims (8)

An electromagnetic solenoid device used as an actuator for operating a valve opening characteristic changing unit that changes a valve opening characteristic of an intake valve or an exhaust valve of an internal combustion engine,
A fixing member;
A movable member arranged to be axially displaceable,
A solenoid coil that generates an electromagnetic force that displaces the movable member in a first direction that attracts the movable member and the fixed member by excitation by energization;
A pin member connected to the valve-opening characteristic changing unit, coupled to the movable member, and arranged to be displaced in the axial direction in conjunction with the movable member;
An electromagnetic force that is disposed around the pin member and generates a biasing force that pushes the pin member in a second direction opposite to the first direction, and displaces the pin member in the first direction by excitation by energization. A coil spring that produces
An electromagnetic solenoid device comprising: Failure detection means for detecting failure of the solenoid coil;
Energization timing setting means for setting the energization timing to the coil spring when a failure of the solenoid coil is detected;
Energization control means for energizing the coil spring according to the energization timing when a failure of the solenoid coil is detected;
The electromagnetic solenoid device according to claim 1, further comprising:   The energization timing setting means includes a response of displacement of the movable member when the solenoid coil is switched from non-energization to energization, and a response of displacement of the pin member when the coil spring is switched from non-energization to energization. The electromagnetic solenoid device according to claim 2, wherein the energization timing is set according to a difference between the electromagnetic solenoid device and the electromagnetic solenoid device.   4. The electromagnetic solenoid according to claim 1, wherein the coil spring has a barrel shape in which a coil outer diameter is maximum at an axially central portion and decreases toward both axial end portions. apparatus.   5. The coil spring according to claim 1, wherein the coil wire constituting the coil spring is configured to be double or more in a cross-sectional direction perpendicular to the axial direction. 6. Electromagnetic solenoid device.   The electromagnetic solenoid device according to any one of claims 1 to 5, wherein the coil spring includes a copper wire in a coil wire constituting the coil spring. At least a part of the pin member is a magnetic body,
Induced voltage detection means for detecting an induced voltage induced in the coil spring when the pin member is displaced;
Position detecting means for detecting the position of the movable member according to the detected induced voltage;
The electromagnetic solenoid device according to any one of claims 1 to 6, further comprising: An electromagnetic solenoid device used as an actuator for operating a valve opening characteristic changing unit that changes a valve opening characteristic of an intake valve or an exhaust valve of an internal combustion engine,
A fixing member;
A movable member arranged to be axially displaceable,
A solenoid coil that generates an electromagnetic force that displaces the movable member in a first direction that attracts the movable member and the fixed member by excitation by energization;
A pin member connected to the valve-opening characteristic changing unit, coupled to the movable member, and arranged to be displaced in the axial direction in conjunction with the movable member;
A coil spring that is arranged around the pin member and generates a biasing force that pushes the pin member in a second direction opposite to the first direction;
Induced voltage detection means for detecting an induced voltage induced in the coil spring when the pin member is displaced;
Position detecting means for detecting the position of the movable member according to the detected induced voltage;
An electromagnetic solenoid device further comprising:

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