JP2000248967A - Solenoid-operated valve system drive intake or exhaust valve of internal combustion engine and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid-operated valve system and a control method thereof, capable of gently seating a valve element with a small power consumption by effectively utilizing spring tension in a deceleration direction by a spring holding the valve element, without using deceleration by electromagnetic force and a buffer spring. SOLUTION: An excitation current of a suction side electromagnet for driving a valve element is supplied, after the valve element operation is started, for a period and at a magnitude enough for a mover leading to the electromagnet, thereafter supply of the excitation current is decreased or stopped immediately prior to the mover collides against the electromagnet, and supply of the exciting current for holding the mover is re-started after the lapse of prescribed time. At completion of necessary accelerating action immediately prior to seating, the excitation current of the electromagnet is decreased or stopped, and spring tension in a deceleration direction by a spring holding the valve element is effectively utilized, so as to slowly seat the valve element with a small power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve which functions as an intake valve or an exhaust valve of an internal combustion engine, and more particularly to an electromagnetic drive device for the electromagnetic valve and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, there has been known an electromagnetic valve in which an intake valve or an exhaust valve of an internal combustion engine is opened and closed by electromagnetic force so that a valve opening period and a valve opening / closing timing can be arbitrarily set according to an operation state. Have been. For example, a movable element that moves integrally with the valve body is held at an intermediate position by a pair of springs, and an electromagnetic force is applied to the movable element by flowing a current through electromagnets arranged on both sides in the sliding direction. An electromagnetic valve having a structure in which a mover and a valve element are moved from a neutral position to a fully open direction or a fully closed direction is exemplified. According to the aforementioned electromagnetic valve, for example, when moving the valve body from the fully closed state to the fully open state, the fully closed side holding the fully closed state against the urging force of the spring described above. When the supply of the exciting current to the electromagnet is stopped, the mover and the valve element start moving in the fully open direction by the spring force, and move by the simple vibration of the spring-mass system. Therefore, the valve element can be moved to the fully open position only by supplying the kinetic energy lost due to friction or external force during the movement of the valve element by the electromagnetic force of the fully opened electromagnet, and the valve operating mechanism with excellent energy efficiency Can be configured.

However, in the above-described configuration, the electromagnetic force of the electromagnet for attracting the mover is inversely proportional to the square of the air gap of the mover except for the influence of saturation of the magnetic path. When the armature is supplied, the electromagnetic force rapidly increases as the armature approaches the attracting electromagnet, and the armature violently collides with the electromagnet. Since there is a high demand for quietness in an internal combustion engine mounted on an automobile or the like, it is necessary to reduce the impact noise due to the above-mentioned collision. Also, when the valve is closed, the valve body also collides violently with the valve seat, causing a phenomenon that the valve body jumps on the valve seat,
There is a possibility that the valve will not be reliably closed. In order to reduce the impact noise, deceleration control of the valve body has been performed. For example, JP-A-6-129219 discloses that a valve spring is mechanically decelerated using a buffer spring.
It is disclosed in Japanese Patent Application Publication No. JP-A-2003-110555 that the electromagnet on the side opposite to the attracting side electromagnet is also energized during the operation of the valve body to perform deceleration control of the valve body. Japanese Patent Application Laid-Open No. 4-179806 discloses an electromagnetically driven valve that drives an intake / exhaust valve of an internal combustion engine by an electromagnetic force to open and close the valve. An electromagnetic drive having a plurality of magnetic poles of electromagnets sequentially arranged in the moving direction of the intake and exhaust valves, and means for controlling energization of the electromagnets to sequentially magnetize the magnetic poles in the order arranged according to the operation state of the internal combustion engine; A valve is described.

[0004]

In deceleration control using a buffer spring, a spring force is always generated by the buffer spring in a direction in which the mover is separated from the electromagnet. Need to supply. In the deceleration control in which the electromagnet on the opposite side is also energized, the air gap between the electromagnet and the mover becomes large in a state immediately before seating, which requires the most deceleration, and it is necessary to supply a large exciting current. Other conventional deceleration controls not only require a large holding current or an exciting current, as described above, but also have a problem that the structure of the device becomes complicated.

In view of the above, the present invention makes effective use of the spring force in the deceleration direction of the spring holding the valve body, allows the valve body to be gently seated with low power consumption, and reduces impact noise. An object of the present invention is to provide an electromagnetic valve and a control method thereof.

[0006]

According to the present invention, an exciting current is supplied to an attraction-side electromagnet for driving a valve element, and the valve element is attracted. Then, immediately before the movable element is seated on the electromagnet, the attraction side electromagnet is moved. The supply of the exciting current is reduced or stopped. The present invention is characterized in that the supply of the exciting current is started again after a predetermined time has elapsed.

According to the present invention, in order to perform excitation current control on the attraction side immediately before the mover is seated on the electromagnet, the current state quantity of the mover is obtained and the excitation current control is performed depending on the current state quantity of the mover. ing.

In order to achieve the above object, the present invention is to maintain an intake valve or an exhaust valve of an internal combustion engine and a mover which moves integrally with the valve body at an intermediate position by balancing a pair of springs, and in a sliding direction thereof. An electromagnetic force is applied to the mover by passing a current through electromagnets disposed on both sides of the electromagnetic valve to move the mover and the valve body from the neutral position to the fully open or fully closed direction. After starting the operation of the body, the excitation current of the attraction side electromagnet for driving the valve body is supplied, and then the supply of the excitation current is reduced or stopped immediately before the mover collides with the electromagnet. Is supplied again.

Further, in this method of controlling an electromagnetic valve, the exciting current of the attraction-side electromagnet for driving the valve element is supplied for a period and an amount sufficient for the movable element to reach the electromagnet. It is characterized by.

[0010] In the control method for an electromagnetic valve, the exciting current to be supplied again is supplied in a magnitude necessary for holding the mover reaching the electromagnet.

Further, in this method of controlling an electromagnetic valve, the mover is provided with a mover position measuring means for measuring the position of the mover, and the measured mover position and a mover movement trajectory prepared in advance are determined. And the exciting current of the attraction-side electromagnet for driving the valve element is reduced or stopped when the mover exceeds the mover operation trajectory.

Further, in the method for controlling an electromagnetic valve, the moving path of the mover is provided as a target position with respect to an elapsed time after the operation of the valve element is started.

Further, the control method is characterized in that the mover movement trajectory is given as a target speed with respect to a current position of the valve body.

Further, in this method of controlling an electromagnetic valve, the mover is provided with a mover position measuring means for measuring the position of the mover, and the mover position is calculated from the measured mover position and the mover position. Using the speed of the mover, the kinetic energy of the valve element and the mover and the energy stored in the spring that supports it are calculated, and the sum of the energy is the energy required for the mover to reach the electromagnet. It is characterized in that it decreases or stops when it exceeds.

The present invention specifically provides the following apparatus and method.

According to the present invention, a movable element that moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by balancing a pair of springs, and a current flows through electromagnets disposed on both sides in the sliding direction. In this way, an electromagnetic force is applied to the mover to move the mover from its neutral position to the fully open or fully closed direction, and the A / D converts the operating state signal of the internal combustion engine from analog to digital. A conversion unit, a storage unit for storing a command to reduce the electromagnet driving force for the valve operation, and a signal from the A / D conversion unit for inputting a current state quantity of the mover to obtain a driving force reduction value from the storage unit. And an electromagnetic device for driving an intake valve or an exhaust valve of an internal combustion engine for instructing an electromagnet to perform an excitation operation based on the drive reduction operation from the operation device. Offer a valve To.

According to the present invention, a movable element that moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by balancing a pair of springs, and a current flows through electromagnets disposed on both sides in the sliding direction. By applying an electromagnetic force to the mover by moving the mover from its neutral position to the fully open or fully closed direction, the method of controlling the electromagnetic valve operates to determine the current state quantity of the mover, The present invention provides a method for controlling an electromagnetic valve that drives an intake valve or an exhaust valve of an internal combustion engine that reduces or stops the supply of an exciting current immediately before a mover collides with an electromagnet.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described. FIG. 1 is a diagram showing the configuration of the first exemplary embodiment of the present invention.

The electromagnetic valve shown in FIG. 1 is arranged so that an intake / exhaust valve 1 and a mover 2 of an internal combustion engine slide integrally, and the spring force is balanced by a pair of springs 5 and 6. It is held at the middle position of the sliding range. A fully open electromagnet 3 and a fully closed electromagnet 4 are arranged at positions corresponding to both ends of the sliding range of the mover 2, and an electromagnetic force (excitation operation command) is applied to the mover 2 by applying a current to these electromagnets 3 and 4. 2
4) is operated to move the mover 2 and the intake / exhaust valve 1 from the neutral position in the fully open direction or the fully closed direction, thereby realizing opening and closing of the intake / exhaust valve.

The sensor input group indicating the state of the internal combustion engine is A /
The data is input to the D conversion unit 7 and passed to the arithmetic unit 8. The arithmetic unit 8 calculates the operation timing of the electromagnetic valve and the supply time and magnitude of the exciting current from the sensor input value, or reads out from the table of the storage unit 9 and sends it to the D / A conversion units 10 and 11 at a predetermined timing. An excitation operation command 24 based on the current command value (movable element operation command 20) is output. The converted current command value is input to the drive circuits 12 and 13 and supplies an exciting current corresponding to the command value to the electromagnets 4 and 5.

FIG. 2 is a diagram showing the relationship between the position of the mover and the current command value. In the figure, (a) is a diagram showing a current command value to the fully-closed electromagnet, (b) is a position of the mover, and (c) is a diagram showing a time change of a current command value to the fully-opened electromagnet. In the drawing, as an example, a case where the operation is performed from the fully closed state xc to the fully opened state xo is shown. The electromagnetic valve starts operating in accordance with the opening / closing valve timing calculated from the input signal of the crank angle sensor attached to the internal combustion engine or the opening / closing valve timing directly instructed by the ECU (Engine Control Unit). And When the current supply to the fully closed electromagnet is stopped at time t0, the mover and the valve element start moving in the fully open direction by the biasing force of the spring. During this time, the supply of the acceleration current I1 to the fully opened electromagnet is started, and the mover is further accelerated in the fully opened direction by the electromagnetic force. When the mover position exceeds the neutral position xm, the spring force changes the direction of the force in the deceleration direction. Therefore, when the supply of the current to the fully open electromagnet is stopped, the mover starts to decelerate. Therefore,
By stopping the current supply at the specified time t1,
The speed at which the mover sits on the fully open electromagnet can be reduced. In this state, the movable element and the valve element return to the fully closed side due to the biasing force of the spring in the opposite direction. Therefore, at time t2, the holding current I2 for holding the movable element to the fully open side is supplied. Since the mover is seated on the fully-opened electromagnet at time t3, it is sufficient to supply a holding current I3 that can provide an electromagnetic force sufficient to oppose the spring force after time t4. That is,
Time integration of the electromagnetic force acting on the mover by the exciting current I2 supplied to the electromagnet during the period from time t0 to t1;
In other words, if the kinetic energy provided by the electromagnetic force is set to be equal to the energy lost due to friction or the like during the movement of the valve body, the speed at which the mover sits on the electromagnet can be made close to zero. . In addition, the amount of energy to be supplied also changes depending on the state of the lubricating oil in the sliding portion of the valve body and the required torque, so that the coolant temperature of the internal combustion engine, the oil temperature, the accelerator opening, the valve current command value, etc. From the value of the sensor input group 25,
The magnitude of the acceleration current I1 and the application periods t0 to t1 may be changed.

In FIG. 1, the current state quantity 21 of the mover is obtained based on the value from the sensor input group 25, the target value 24 for the current state quantity of the mover is obtained from the storage unit 9, and both are compared. A decrease command 23 is obtained, and this value is reflected on the mover operation command 20 to obtain an excitation operation command.

Next, a second embodiment of the present invention will be described.
FIG. 3 is a diagram showing the configuration of the second embodiment of the present invention.

The sensor input group indicating the state of the internal combustion engine and the output of the mover position measuring means 14 for measuring the position of the mover 2 are input to the A / D converter 7 and passed to the arithmetic unit 8. In the case of this embodiment, the output of the mover position measuring means 14 directly indicates the current state quantity 21 of the mover. The arithmetic unit 8 compares the position information of the mover with the value of the mover movement trajectory table of the storage device 9, and according to the result, D / A
The current command value is output to the conversion units 10 and 11. The converted current command value is input to the drive circuits 12 and 13 and supplies an exciting current corresponding to the command value to the electromagnets 3 and 4.

The movement path of the mover held in the storage device 9 prepares in advance the change of the ideal position of the mover 2 which is realized when the mover smoothly moves so that the seating speed of the mover becomes zero. It was done. Since the kinetic energy is lost due to friction or the like during the movement of the mover 2 and the intake / exhaust valve 1, the actual trajectory of the mover operates later than the trajectory stored in the storage unit. Here, since the mover is accelerated by the electromagnetic force of the electromagnets 3 and 4, it overtakes the trajectory (movement element operation trajectory) held in the storage unit 9 when the supply energy is sufficiently given. If the supply of the acceleration current is stopped at this point, the speed at which the mover is seated on the electromagnet can be made close to zero. The control method is the same as in the first embodiment.

Next, a third embodiment of the present invention will be described.

In the second embodiment described above, it is conceivable that the trajectory held in the storage unit is given as a target position with respect to the elapsed time after the start of the operation of the valve body. Thus, the movable element current state quantity is obtained, and the supply of the exciting current can be reduced or stopped immediately before the movable element is seated on the electromagnet based on the movable element current state quantity. For example, as shown in FIG. 4, the change 40 of the ideal position of the mover realized when the mover smoothly moves so that the seating speed of the mover becomes zero is stored in a table for each elapsed time.
It is stored in the storage unit 9. That is, the time axis is adjusted to 1/2 of the period tf of the natural vibration physically determined by the mass of the valve element and the mover and the spring constant of the spring holding the same, and the trajectory of the movement is determined without considering the frictional damping. What is necessary is just to calculate in advance as a cosine curve which is the locus of the pendulum vibration.
Since the actual speed change of the mover is decelerated by friction or the like, a curve as shown by a curve 41 is drawn. Here, since the mover is accelerated by the electromagnetic force, the locus following the curve 41 moves in the direction of the arrow in the figure to catch up with the target curve 40. At this time, that is, when the supply of the acceleration current is stopped immediately before the mover is seated on the electromagnet, the speed at which the mover is seated on the electromagnet can be made close to zero.

Next, a fourth embodiment of the present invention will be described.

In the second embodiment described above, it is also conceivable to give the trajectory held in the storage unit as the target speed for the current position of the valve body. by this,
The mover current state quantity is obtained, and the supply of the exciting current can be reduced or stopped immediately before the mover is seated on the electromagnet based on the mover current state quantity. For example, as shown by a curve 50 in FIG. 5, the ideal change in the speed of the mover realized when the mover smoothly moves so that the seating speed of the mover becomes zero is converted into a table for each mover position. deep. That is, the position axis may be set as the moving range xc to xo of the mover, and the change in speed may be calculated in advance as a sine curve. According to this method, even if the natural frequency is deviated due to, for example, a spring set due to a change with time, a variation in a spring constant at the time of manufacture, or a variation in the mass of the movable portion, the speed is not changed at a desired position (xc). It is possible to define a motion that is zero. The trajectory of the movement in the position-velocity plane will be described next. Since the actual speed change of the mover is decelerated by friction or the like, a curve as shown by a curve 51 is drawn. Here, since the mover is accelerated by the electromagnetic force, the trajectory following the curve 51 moves in the direction of the arrow in the figure to catch up with the target curve 50. At this point, that is, when the supply of the acceleration current is stopped immediately before the mover is seated on the electromagnet, the speed at which the mover is seated on the electromagnet can be made close to zero.

Next, a fifth embodiment of the present invention will be described.
FIG. 6 is a diagram showing a calculation procedure according to the fifth embodiment of the present invention, and FIG. 7 is a diagram showing a time chart. FIG.
Can be used in the fifth embodiment of the present invention.

In FIG. 3, the sensor input group indicating the state of the internal combustion engine and the output of the mover position measuring means 14 for measuring the position of the mover 2 are input to the A / D converter 7 and passed to the arithmetic unit 8. . The arithmetic unit 8 calculates the total kinetic energy of the intake / exhaust valve 1 and the mover 2 based on the position information of the mover and the speed information calculated from the position information. The result is compared with the minimum energy required for sitting, and the current command value is output to the D / A converters 10 and 11 until the minimum energy is exceeded. The converted current command values are supplied to drive circuits 12 and 13
Is supplied to the electromagnets 3 and 4 according to the command value.

Next, a specific calculation procedure of the energy comparison will be described. The energy 61 stored in the spring is calculated from the measured position input 60 of the mover. The energy 61 stored in the spring becomes zero at the neutral position xm and becomes maximum at both ends of the movable range of the mover. In parallel,
From the measured position input 60 of the mover, the speed calculating means 62
Calculates the speed of the mover. As a method of calculating the speed, a differential operation of the position of the mover may be simply performed. In the case of discretization processing by a digital computer, the speed can be obtained by dividing the change in position by the sampling period. Alternatively, a method of defining a motion model of a spring pendulum in a computer and configuring a speed estimator using a state observer is also conceivable. Next, the kinetic energy 63 of the valve element and the mover is calculated using the speed calculated by the speed calculation means 62. As shown in FIG. 7, the calculated sum of these two energies is the total energy stored by the electromagnetic valve in the pendulum motion system. On the other hand, the energy 64 required for the mover to reach the electromagnet on the opposite side is only the energy stored in the spring at both ends of the moving range of the mover, and the kinetic energy is also zero because the mover is seated at zero speed. Here, the total energy stored in the pendulum motion system by the electromagnetic valve and the energy required for the mover to reach the electromagnet on the opposite side are compared by the comparator 65. If the total energy exceeds the required energy, it is 0, exceeding Otherwise, 1 is output. A value obtained by multiplying the output of the comparator 65 by the gain 66 is output to the drive circuit as a current command value. When the total energy exceeds the required energy, that is, immediately before the mover is seated on the electromagnet, 0 is output as the command value of the acceleration current, and if the current supply is stopped, all the kinetic energy held at that time will be spring-loaded. Is converted to energy to reduce
The speed of the mover when seated becomes zero. According to this method, the time at which the current supply is stopped can be determined without preparing a time table or a table of the trajectory pattern inside the controller. In addition, since the comparison is directly performed as the energy amount, there is an advantage that appropriate speed control can be performed even if the movable element and the valve element can be decelerated or decelerated by a disturbance that is not considered.

The control method of the electromagnetic valve described above can be applied not only to the reduction of the seating speed in the normal valve operation but also to the initialization operation for moving the valve body from the neutral position to the fully closed position at the time of starting the engine. It is also suitable for reducing the seating speed. As described above, the movable element and the valve element are held at the intermediate position by the balance of the integral spring when no electromagnetic force is applied, but the initialization operation for moving the intake / exhaust valve to the fully closed position when the internal combustion engine is started. Is required. Generally, the initializing operation involves supplying a large current to the electromagnet and pulling it up to the fully closed side at once, or generating an electromagnetic force alternately at a period that matches the natural vibration period of the movable part, and gradually moving by resonance A method of raising the child position to the fully closed side is used. While the electromagnetic force during steady operation is used to compensate for the loss of kinetic energy as described above, the electromagnetic force is generated when the air gap between the electromagnet and the mover is large in any of the methods during the initialization operation. You need to
Requires large current compared to steady state operation. In this case, the seating impact of the valve element and the mover must be larger than usual, and reducing the seating speed is a more important issue. Since the electromagnetic valve control method of the present invention does not require a large current for deceleration, it is a suitable method even during an initialization operation that requires more power.

It is also effective to set the mover current state to a preset position.

According to another embodiment of the present invention, a movable element which moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by a pair of springs, and is provided on both sides in the sliding direction. An electromagnetic force is applied to the mover by flowing a current through the arranged electromagnet, and the mover position is determined by a method of controlling an electromagnetic valve that moves the mover from its neutral position in the fully open or fully closed direction. 1m sitting on electromagnet
Drive the intake or exhaust valve of the internal combustion engine to reduce or stop the supply of the exciting current in the direction in which the mover has been operated, provided that the position exceeds a preset position within the range of m to 2 mm. A method for controlling an electromagnetic valve is provided.

Further, in addition to the condition that the movable element has exceeded a preset position within a range of 1 mm or more and 2 mm or less in which the movable element is seated on the electromagnet, the internal current for controlling the exciting current by obtaining other current state quantities of the movable element. A method of controlling an electromagnetic valve that drives an intake valve or an exhaust valve of an engine may be used.

With this configuration, the entire apparatus can be made compact.

[0038]

According to the present invention, the exciting current of the electromagnet is reduced or stopped at the time when the necessary acceleration operation immediately before the seating is completed without using the deceleration by the electromagnetic force or using the buffer spring, and the valve body is held. By effectively utilizing the spring force in the deceleration direction by the spring being operated, there is an effect that the valve body can be gently seated with little power consumption.

Further, according to the present invention, by using the position of the mover to determine the time at which the exciting current of the electromagnet is reduced or stopped, the movable member and the valve body can be decelerated or decelerated by an unconsidered disturbance. Even if performed, there is an advantage that appropriate speed control can be performed.

Further, according to the present invention, the time at which the current supply is stopped can be determined without preparing a time table or a trajectory pattern table inside the controller by directly comparing the amount of energy. There is an advantage.

Further, according to the present invention, since a large current for deceleration is not required, appropriate speed control can be performed even during an initialization operation for moving the valve body from the neutral position to the fully closed position when the engine is started. There is an advantage that can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a control method of an electromagnetic valve according to the present invention.

FIG. 2 is a diagram illustrating a relationship between a position of a mover and a current command value according to a method of controlling an electromagnetic valve according to the present invention.

FIG. 3 is a configuration diagram showing another embodiment of the control method of the electromagnetic valve according to the present invention.

FIG. 4 is an example of an armature operation trajectory used in the method of controlling an electromagnetic valve according to the present invention.

FIG. 5 is another example of the moving path of the mover used in the control method of the electromagnetic valve according to the present invention.

FIG. 6 is a diagram illustrating a specific calculation procedure of energy comparison in the method of controlling an electromagnetic valve according to the present invention.

FIG. 7 is a time chart of another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Intake / exhaust valve, 2 ... Movable element, 3 ... Fully open side electromagnet, 4 ... Fully closed side electromagnet, 5 ... Lower spring, 6 ... Upper spring, 7 ... A / D conversion part, 8 ... Calculation device, 9 ... Storage Apparatus, 10, 11 ... D / A
Conversion units, 12, 13 ... Drive circuit, 14 ... Mover position measurement means.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 7/18 H01F 7/18 S (72) Inventor Noriyuki Maekawa 502 Kandamachi, Tsuchiura-shi, Ibaraki Pref. Inside the Ritsumeikan Machinery Research Laboratory (72) Inventor Atsushi Yokoyama 502, Kandachicho, Tsuchiura-shi, Ibaraki Prefecture Inside the Ritsumeikan Machinery Research Laboratory Co., Ltd. Inside the Equipment Division (72) Inventor Kiichi Hoshi 2477 Takaba, Hitachinaka-shi, Ibaraki F-term in Hitachi Car Engineering Co., Ltd. DB26 DB32 DC02 DC17 DD03 EE22 FB07 KK17

Claims (15)

[Claims] 1. A movable element that moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by a pair of springs, and a current flows through electromagnets disposed on both sides in the sliding direction. An A / D converter for A / D converting an operating state signal of an internal combustion engine in an electromagnetic valve having a structure in which an electromagnetic force is applied to a mover to move the mover from a neutral position to a fully open or fully closed direction. And a storage unit for storing a command for reducing the driving force of the electromagnet with respect to the valve operation. A signal from the A / D conversion unit is input to obtain a current state quantity of the mover, and a driving force reduction value from the storage unit is obtained. An operation device for performing a drive reduction operation on a mover operation command, and instructing an electromagnet to perform an excitation operation based on the drive reduction operation from the operation device, thereby driving an intake valve or an exhaust valve of the internal combustion engine. Electromagnetic Valve. 2. The electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine according to claim 1, wherein the movable element current state quantity is a position of the movable element calculated by calculation. 3. The electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine according to claim 1, wherein the movable element current state quantity is a detection position of the movable element. 4. The electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine according to claim 1, wherein the movable element current state quantity is a moving speed of the movable element. 5. The electromagnetic system for driving an intake valve or an exhaust valve of an internal combustion engine according to claim 1, wherein the driving force reduction calculation is based on the total kinetic energy of the intake valve or the exhaust valve and the mover. Type valve. 6. An exciting current is supplied again after a lapse of a predetermined time of an exciting operation based on a mover driving force reduction calculation or when the mover reaches a predetermined position. An electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine. 7. A movable element which moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by a pair of springs, and a current is supplied to electromagnets disposed on both sides in the sliding direction. In a method of controlling an electromagnetic valve in which an electromagnetic force is applied to a mover to move the mover from its neutral position in a fully open direction or a fully closed direction, a mover current state quantity is obtained, and the mover current state quantity is determined based on the mover current state quantity. A method of controlling an electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine, wherein the supply of the exciting current is reduced or stopped immediately before the mover is seated on the electromagnet. 8. The apparatus according to claim 7, wherein the excitation current is started to be supplied again after a predetermined time of the excitation operation based on the mover driving force reduction calculation or when the mover reaches a predetermined position. For controlling an electromagnetic valve that drives an intake valve or an exhaust valve of an internal combustion engine. 9. An internal combustion engine according to claim 7, wherein the exciting current to be supplied again is supplied with a magnitude necessary for holding the mover reaching the electromagnet. Control method of the electromagnetic valve. 10. The attraction-side electromagnet for driving the valve element according to claim 7, wherein the position of the mover is measured, and the measured mover position is compared with a previously prepared mover operating trajectory. A method of controlling an electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine, wherein the exciting current decreases or stops when the mover exceeds the mover operation trajectory. 11. The electromagnetic type driving an intake valve or an exhaust valve of an internal combustion engine according to claim 10, wherein the mover operation trajectory is given as a target position with respect to an elapsed time after the operation of the valve element starts. Valve control method. 12. The control of an electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine according to claim 10, wherein the mover operation trajectory is given as a target speed with respect to a current position of the valve element. Method. 13. The mover according to claim 9, wherein the position of the mover is measured,
Using the speed of the mover calculated from the position of the mover, the kinetic energy of the valve element and the mover and the energy stored in the spring that supports it are calculated. A method of controlling an electromagnetic valve for driving an intake valve or an exhaust valve of an internal combustion engine, wherein the control is reduced or stopped when the energy required to reach the energy is exceeded. 14. A movable element that moves integrally with an intake valve or an exhaust valve of an internal combustion engine is held at an intermediate position by a pair of springs, and a current is supplied to electromagnets disposed on both sides in the sliding direction. An electromagnetic force is applied to the mover to determine the position of the mover in a control method of an electromagnetic valve that moves the mover from its neutral position in the fully open or fully closed direction, and the mover is seated on the electromagnet in a range of 1 mm to 2 mm. The intake valve or the exhaust valve of the internal combustion engine, characterized in that the supply of the exciting current in the direction in which the mover was operated is reduced or stopped on condition that the position exceeds a preset position in the range of Control method of the driven electromagnetic valve. 15. The excitation according to claim 14, wherein in addition to the condition that the mover has exceeded a preset position within a range of 1 mm or more and 2 mm or less in which the mover is seated on the electromagnet, other current state quantities of the mover are obtained. A method for controlling an electromagnetic valve that drives an intake valve or an exhaust valve of an internal combustion engine, wherein the method controls current.