JPH11132017A - Control device for solenoid driving valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a solenoid driving valve from being out of order and quickly return the solenoid driving valve to its normal condition when a failure occurs in this valve, in relation to a device for controlling the solenoid driving valve which functions as an intake valve or an exhaust valve of an internal combustion engine. SOLUTION: An upper core 18 for holding an upper coil 22 and a lower core 20 for holding a lower coil 24 are arranged respectively above and below an armature 16 connected to a valve element 12. A solenoid driving valve 10 is provided with a position sensor 36, a controller 38, and a driving device 40 as control devices. The controller 38 calculates the deviation of actual displacement of the valve element 12, which is detected by the position sensor 36, from a target displacement. When the deviation is above a threshold value, the driving device 40 supplies additional current to the upper coil 22 or the lower coil 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electromagnetically driven valve, and more particularly to a control of an electromagnetically driven valve suitable for controlling an electromagnetically driven valve functioning as an intake valve or an exhaust valve of an internal combustion engine for a vehicle. Related to the device.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Application Publication No.
As disclosed in No. 44, an electromagnetically driven valve constituting an intake valve or an exhaust valve of an internal combustion engine is known. The conventional electromagnetically driven valve includes a pair of elastic bodies and a pair of electromagnetic coils. In the above-mentioned electromagnetically driven valve, when an exciting current is supplied to the electromagnetic coil, it passes through the core and the armature,
A magnetic flux circulating inside and outside the electromagnetic coil is generated. On this occasion,
Attraction between the core and the armature acts to attract them. Therefore, according to the above-mentioned electromagnetically driven valve, the excitation current is alternately supplied to the upper and lower two electromagnetic coils,
The valve can be opened and closed.

[0003]

During the opening and closing operations of the electromagnetically driven valve, disturbances such as sliding friction due to displacement and in-cylinder pressure of the internal combustion engine act on the valve body. When these disturbances act on the valve body, the excitation current supplied initially may not generate the electromagnetic force required for seating the valve body, or the electromagnetic force required for seating the valve seat may be excessive. More specifically, with the excitation current supplied initially, a situation may occur in which the valve body does not reach the valve seat due to insufficient electromagnetic force, or a situation where the valve body rebounds from the valve seat due to excessive electromagnetic force (hereinafter, referred to as the following). This state is called step-out of the valve body or the electromagnetically driven valve). In order to properly operate an internal combustion engine having an electromagnetically driven valve that constitutes an intake valve or an exhaust valve, it is necessary to prevent the above-mentioned step-out and, when the above-mentioned step-out occurs, to immediately start the electromagnetically-driven valve. Needs to be demodulated to a normal state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a control device for an electromagnetically driven valve which effectively prevents a valve from stepping out of a drive signal to the electromagnetically driven valve. I do.

[0005]

The above object is achieved by the present invention.
As described in, a pair of electromagnets and a pair of elastic bodies cooperate, in a control device of an electromagnetically driven valve that opens and closes the valve body, a displacement detecting means for detecting the displacement of the valve body,
A first additional current means for increasing an exciting current supplied to the electromagnet when a deviation between the detected amount of displacement and a target amount of displacement is equal to or larger than a threshold value. Is done.

In the present invention, when the deviation between the detected displacement and the target displacement exceeds a threshold, the exciting current supplied to the electromagnet is changed to a larger value than the initially supplied exciting current. Is done. When the exciting current increases, the electromagnetic force for urging the valve body in the displacement direction increases. For this reason, according to the present invention, the step out of the valve body can be prevented.

Further, the above object is achieved by a control apparatus for an electromagnetically driven valve according to the first aspect.
Step-out detecting means for detecting step-out of the valve element, and second additional current means for applying an exciting current to the electromagnet on the other displacement end when a step-out occurs at one displacement end. This is achieved by the control device of the electromagnetically driven valve.

In the present invention, when step-out occurs at one displacement end, the valve body is displaced toward the other displacement end by the urging force of the elastic body. When such a situation occurs, the second additional current is supplied to the electromagnet on the other displacement end side at a predetermined timing. According to the second additional current, it is possible to suppress the amount of attenuation of the amplitude generated in the process in which the valve body is displaced to the other displacement end side. In this case, the second additional current is displaced toward the displacement end where the step-out has occurred while maintaining the large amplitude. Thus, when the amplitude of the valve body is maintained large, the valve body can easily reach the displacement end where the step-out has occurred.
For this reason, according to the present invention, when step-out occurs in the valve element, the step-out can be quickly eliminated and the valve element can be returned to the normal opening / closing operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall configuration diagram of a control device for an electromagnetically driven valve 10 according to one embodiment of the present invention. The electromagnetically driven valve 10 has a valve element 12. The valve element 12 is a member disposed in the cylinder head with its lower end portion exposed in the combustion chamber of the internal combustion engine, and constitutes an intake valve or an exhaust valve of the internal combustion engine.

A valve shaft 14 is fixed to the valve body 12. An armature 16 is fixed to the upper end of the valve shaft 14. The armature 16 is an annular member made of a soft magnetic material. An upper core 18 is provided above the armature 16, and a lower core 20 is provided below the armature 16.
, Respectively. The upper core 18 and the lower core 20 are both members made of a magnetic material. The upper core 18 holds the upper coil 26, and the lower core 20 holds the lower coil 24.
Is gripped. Upper core 18 and lower core 20
A holding member 26 is provided on the outer periphery of the. The upper core 18 and the lower core 20 are held by a holding member 26 such that a predetermined interval is secured therebetween.

The valve shaft 14 is provided with the upper spring 3.
0 and the lower spring 32 are elastically supported in the axial direction. That is, the upper spring 30
The lower spring 32 moves downward in FIG.
Are urged upward in FIG. The upper spring 30 and the lower spring 32 are adjusted so that the neutral position of the armature 16 is at an intermediate position between the upper core 18 and the lower core 20.

The system of this embodiment includes a position sensor 36, a controller 38,
And a driving device 40. The position sensor 36 is
This is a device for detecting the displacement position of the valve element 12. Further, the driving device 40 is connected to the upper coil 22 and the lower coil 24 of the electromagnetically driven valve 10. The driving device 40
This is a device for supplying an exciting current to the upper coil 22 and the lower coil 24 of the electromagnetically driven valve 10. Further, the controller 38 includes the position sensor 36 and the driving device 40 described above.
It is connected to the. The controller 38 includes the position sensor 3
6 is a device that controls the excitation current supplied to the upper coil 22 and the lower coil 24 by the drive device 40 based on the input value of 6.

Hereinafter, the operation of the electromagnetically driven valve 10 will be described with reference to FIG. 2A shows the displacement of the electromagnetically driven valve during normal operation, FIG. 2B shows the exciting current supplied to the lower coil 24, and FIG.
Shows the exciting current supplied to. According to the electromagnetically driven valve 10,
When the exciting current does not flow through the upper coil 22 and the lower coil 24, the armature 16 is maintained at the neutral position. In this state, when the supply of the exciting current to the lower coil 24 is started, around the lower coil 24,
Magnetic flux that flows through the lower core 20, the armature 16, and the air gap formed therebetween is generated. When the above magnetic flux is generated, the lower core 20 and the armature 16
An electromagnetic force for attracting the armature 16 toward the lower core 20 is generated between the two.

When the above-described electromagnetic force acts on the armature 16, the armature 16, the valve shaft 14, and the valve body 12
(Hereinafter, these are collectively referred to as a movable portion 34) are displaced downward in FIG. 1 against the urging force of the lower spring 32. And the displacement is armature 1
6 is continued until it comes into contact with the lower core 20. FIG. 2 shows a state in which the movable portion 34 is held at the valve closing end before time t _N. During this time, the holding current I _H is supplied to the upper coil 22 as shown in FIG. The holding current I _H is a minimum necessary current for holding the armature 16 by suction at the valve closing end. When a valve opening request is issued to the valve element, first, the supply of the holding current I _H is stopped (time t _N in FIG. 2). When the supply of the exciting current to the upper coil 22 is stopped, the electromagnetic force necessary to maintain the armature 16 at the valve-closed end disappears. When the electromagnetic force disappears, the movable portion 34 is displaced downward in FIG. 1 by being urged by the upper spring 30.

After stopping the supply of the holding current I _H to the upper coil 22, the driving device 40 turns off the lower coil 24 at the time when a predetermined time T _ON elapses (time t ₀ in FIG. 2).
Is supplied with an appropriate exciting current. When such an exciting current flows, an electromagnetic force for attracting the armature 16 to the lower core 20, that is, an electromagnetic force for displacing the movable portion 34 downward in FIG. 1 is generated.

When the electromagnetic force acts on the armature 16, the movable portion 34 is displaced against the urging force of the lower spring 32 until the armature 16 contacts the lower core 20. Under a situation where the armature 16 is in contact with the lower core 20, a state where the movable portion 34 is held at the valve open end is realized. Therefore, according to the electromagnetically driven valve 10, after the supply of the holding current I _H to the upper coil 22 is stopped, a predetermined exciting current is supplied to the lower coil 24 at an appropriate timing, so that the holding at the valve closing end is performed. The movable portion 34 that has been set can be displaced to the valve opening end.

Thereafter, when the supply of the holding current I _H to the lower coil 24 is stopped and the exciting current is supplied to the upper coil 22 at an appropriate timing, the movable portion 34 is displaced from the valve opening end to the valve closing end. Can be done. in this way,
According to the electromagnetically driven valve 10, the movable portion 34 can be opened and closed by appropriately supplying an exciting current to the upper coil 22 and the lower coil 24.

Incidentally, in order to open the valve body 12, the upper spring 30 and the lower spring 32
It is necessary to generate a large electromagnetic force as compared with the urging force generated by the electromagnetic force. The urging forces generated by the upper spring 30 and the lower spring 32 increase proportionally as the armature 16 approaches the lower core 20. On the other hand, the electromagnetic force acting between the armature 16 and the lower core 20 is
As the armature 16 approaches the lower core 20, it rapidly increases to a large value. For this reason, in order to reliably and quietly adsorb and hold the valve element 12 to the valve opening seat, the lower coil 24 applies a large current to the lower coil 24 when the valve element 12 is separated from the valve opening end. It is desirable to supply a small current when approaching the open end.

In order to satisfy the above requirements,
The excitation current supplied to the lower coil 24 is
It is changed as shown in FIG. That is, the lower coil 2
4 shows the holding current I to the upper coil 22._HSupply of
After stopping, a predetermined time T_ON(See FIG. 2)
Time t₀) Adsorption current I_AIs supplied. Adsorption current
I _AMoves the armature 16 away from the valve-open end.
This is the current for drawing to the valve opening side. Attraction current I
_AIs a predetermined time T_AContinuously supplied to the lower coil 24 during
Is done. The armature 16 has a predetermined time T_AWhile elapses
Approaching the valve opening end. The lower coil 24 has a predetermined time
T_AHas elapsed (time t in FIG. 2)₁), Transition current
I_MIs a predetermined time T_MSupplied during. Furthermore, the transition current
I_MDecreases as the armature 16 approaches the valve opening end
Current. Predetermined time T_M(See Figure 2)
Time t_Two), The lower coil 24 has an armature 16
Is the minimum holding current I required to keep
_HIs supplied.

In this embodiment, when the exciting current supplied to the lower coil 24 is changed as described above, the valve body 12 can be reliably and quietly opened.
Hereinafter, control for changing the exciting current supplied to the lower coil 24 in the above-described predetermined pattern is referred to as feedforward control (F / F control). During operation of the electromagnetically driven valve 10,
Disturbances such as sliding friction due to displacement of the movable portion 34 and in-cylinder pressure of the internal combustion engine act on the valve body 12. When these disturbances act on the valve element 12, the excitation current shown in FIG.
2 may not be able to obtain the electromagnetic force for properly seating the valve seat on the valve seat. More specifically, when the above-described F / F control is executed, a situation occurs in which the valve body 12 does not arrive at the valve seat due to insufficient electromagnetic force or a situation where the valve body 12 rebounds from the valve seat due to excessive electromagnetic force. May be. Hereinafter, such a phenomenon that the valve body 12 does not properly seat on the valve seat is referred to as step-out of the electromagnetically driven valve.

In order to properly operate an internal combustion engine equipped with the electromagnetically driven valve 10, it is necessary to prevent the electromagnetically driven valve 10 from falling out of synchronization. It is important that the operation of the electromagnetically driven valve 10 be demodulated to a normal state. The system of the present embodiment is characterized in that the above functions are realized without impairing the power saving characteristics of the electromagnetically driven valve 10. Hereinafter, the characteristic portion of the present embodiment will be described with reference to FIGS.

FIG. 3 is a time chart realized in a process in which the valve element 12 is displaced from the valve-closing end to the valve-opening end. FIG. 3A shows a target displacement of the valve body 12 (displacement indicated by a dashed line in the figure) and a displacement when a step-out occurs in the electromagnetically driven valve 10 (a pattern shown in an actual battle in the figure). . Also,
FIG. 3B shows a drive current pattern when the valve element 12 is displaced along the target displacement (a pattern indicated by a broken line in the figure) and a drive current when the electromagnetic drive valve 10 is out of synchronization. And a current pattern (a pattern shown by a solid line in the figure).

In this embodiment, the controller 38
The position of the valve body 12 is detected based on the output signal of the position sensor 36. Then, when a deviation equal to or more than a predetermined value is recognized between the position of the valve body 12 and the target displacement, the controller 38 determines that the electromagnetically driven valve 10 is about to lose synchronism. As shown in FIG. 3 (B), when the controller 38 determines that step-out is about to occur in the course of the displacement of the valve body 12 from the valve-closing end to the valve-opening end, the controller 38 applies a predetermined time T to the lower coil 24. _LOW1 between, circulating predetermined current I ₁ (> I _a). Hereinafter, the current supplied to the lower coil 24 at such timing is referred to as an additional current I _add1 .

When the additional current I _add1 is supplied to the lower coil 24, the attractive force acting between the armature 16 and the lower core 20 is increased as compared with the execution of the F / F control. When a large electromagnetic force is generated between the armature 16 and the lower core 20 during execution of the F / F control, the electromagnetically driven valve 10 that has lost synchronism during the execution of the F / F control returns to a normal state. May be.

The actual displacement shown by a solid line in FIG. 3A indicates a case where the electromagnetically driven valve 10 has returned to a normal state by executing the above processing. As described above, according to the electromagnetically driven valve 10 of the present embodiment, it is possible to effectively prevent the electromagnetically driven valve 10 from stepping out during the displacement of the valve body 12 from the valve-closed end to the valve-opened end. it can. FIG. 4 shows a time chart realized in a process in which the valve element 12 is displaced from the valve closing end toward the valve opening end. FIG. 4A shows a target displacement of the valve body 12 (displacement indicated by a broken line in the figure) and a displacement when the step-out occurs in the electromagnetically driven valve 10 (displacement indicated by a solid line in the figure).
FIG. 4B shows a pattern of the drive current supplied to the lower coil 24 when the valve body 12 is displaced along the target displacement (a pattern shown by a broken line in the figure) and the electromagnetically driven valve 1.
5 shows a pattern of a drive current supplied to the lower coil 24 when a step-out occurs in 0 (a pattern shown by a solid line in the figure). Further, FIG. 4 (C) shows that when the electromagnetically driven valve 10 loses synchronism in the process of opening the valve body 12, the upper coil 2
2 shows a pattern of a driving current supplied to the reference numeral 2 (a pattern shown by a solid line in the figure).

In the system of this embodiment, the position of the valve body 12 may not return to the target displacement even if the additional current I _add1 is supplied to the lower coil 24 at the timing shown in FIG. In this case, thereafter, the electromagnetically driven valve 10 reaches a step-out state. In the present embodiment, the controller 38 detects a deviation between the position of the valve body 12 and the target position at the time when the output of the additional current I _add1 ends, and when the deviation is equal to or more than a predetermined value, the controller 38 It is determined that step-out has occurred.

When the controller 38 determines that the step-out has occurred in the electromagnetically driven valve 10, the controller 38 synchronizes with the time when the supply of the additional current I _add1 to the lower coil 24 is stopped (time t ₃ in FIG. 4). The electromagnetic force pulling the armature 16 toward the valve opening end side is significantly reduced. Then, when the electromagnetic force is significantly reduced, the valve body 12 is displaced toward the valve closing end by the urging force generated by the upper spring 30 and the lower spring 32. Thereafter, the valve element 12 exhibits a single vibration operation in accordance with the urging forces of the upper spring 30 and the lower spring 32.

Accordingly, the valve element 12 which has begun to be displaced to the valve opening end
After approaching the valve-opening end, it is again displaced toward the valve-closing end. When the valve element 12 is again displaced to the valve closing end side, in order for the valve element 12 to properly reach the valve closing end, the amplitude of the valve element 12 during the simple oscillation of the valve element 12 as described above. Is not greatly attenuated. During the displacement process in the valve opening direction, the valve body 12 that has not properly reached the valve opening end has passed a predetermined time after the step out of the electromagnetically driven valve 10 is detected (time t ₃ in FIG. 4). Time point (time t in FIG. 4)
_{In 4} ), it reaches the vicinity of the valve closing end. In this embodiment,
The controller 38 allows a predetermined current I ₂ to flow through the upper coil 22. The predetermined current I ₂ is a predetermined time T
It is continuously supplied to the upper coil 22 during _up1 . Hereinafter, the current supplied to the upper coil 22 at such timing is referred to as an additional current I _add2 .

When the additional current I _add2 is supplied to the upper coil 22, an attractive force acts between the armature 16 and the upper core 18. For this reason, when the additional current I _add2 is supplied to the upper coil 22, it is possible to reduce the amount of attenuation that occurs in the amplitude of the valve body 12 when displacing from the valve opening end to the valve closing end. In this case, the upper coil 2
_After the supply of the additional current I _add2 to the _valve 2 is stopped (time t ₅ in FIG. 4), the armature 16 is displaced to a position _{very close} to the valve opening end by the urging forces of the upper spring 30 and the lower spring 32.

Additional current I_add2After the supply of
After the fixed time elapses, the predetermined time is again applied to the lower coil 24.
Current I₁(> I_A) Is supplied (time t₆). Predetermined electricity
Style I ₁Is supplied for a predetermined time T_LOW2Continued during the
You. Hereinafter, at such timing, the power is supplied to the lower coil 24.
Current to be added current I_add3Called. Attached to lower coil 24
Current I_add3Is supplied, armature 16 and roaco
A large electromagnetic force compared to during execution of F / F control
Force acts.

As described above, according to the additional current I _add2 , the attenuation of the amplitude of the valve body 12 can be suppressed. In such a situation, when a large electromagnetic force is generated as compared with the execution of the F / F control, the electromagnetically driven valve 10 that has lost synchronization returns to a normal state. The actual displacement indicated by the solid line in FIG. 4A indicates a case where the electromagnetically driven valve 10 has returned to a normal state by performing the above-described processing. As described above, according to the electromagnetically driven valve 10 of the present embodiment, even when the electromagnetically driven valve 10 loses synchronism in the process in which the valve element 12 is displaced from the valve-closed end to the valve-opened end, the electromagnetically driven valve 10 can be returned to normal immediately. It can be returned to the state.

FIG. 5 shows a time chart realized in the process in which the valve element 12 is held by suction at the valve opening end. FIG.
(A) shows a target displacement of the valve body 12 (displacement shown by a dashed line in the figure) and a displacement (a pattern shown in an actual battle in the figure) when the electromagnetically driven valve 10 is out of synchronization. FIG.
(B) shows a drive current pattern when the valve body 12 is maintained at the target displacement (a pattern indicated by a broken line in the figure) and a drive current pattern when the electromagnetic drive valve 10 is about to lose synchronism. (A pattern shown by a solid line in the figure).

In this embodiment, the controller 3
8 is a case where the valve body 12 is in the process of being displaced when a deviation of a predetermined value or more between the position of the valve body 12 and the target displacement is recognized at a time when the valve body 12 is to be held at the valve open end. Similarly, it is determined that the electromagnetic drive valve 10 is about to lose synchronism. The controller 38 supplies the additional current I _add1 to the lower coil 24 as in the case shown in FIG.

The actual displacement shown by the solid line in FIG. 5A indicates a case where the electromagnetically driven valve 10 has returned to a normal state by executing the above processing. As described above, according to the electromagnetically driven valve 10 of the present embodiment, it is possible to effectively prevent the step out of the electromagnetically driven valve 10 from occurring during the process in which the valve body 12 is suction-held at the valve opening end. . FIG. 6 shows a time chart realized in a process in which the valve element 12 is suction-held at the valve opening end. FIG. 6A shows a target displacement of the valve body 12 (displacement indicated by a broken line in the figure) and a displacement when the step-out occurs in the electromagnetically driven valve 10 (displacement indicated by a solid line in the figure). FIG.
(B) shows a case where the pattern of the drive current supplied to the lower coil 24 (the pattern shown by the broken line in the figure) and the step-out of the electromagnetically driven valve 10 occur when the valve body 12 is maintained at the target displacement. 5 shows a pattern of a drive current supplied to the lower coil 24 (a pattern shown by a solid line in the figure). Further, FIG.
(C) shows that when the electromagnetic drive valve 10 loses synchronism under the condition that the valve element 12 should be kept at the valve open end, the upper coil 2
2 shows a pattern of a driving current supplied to the reference numeral 2 (a pattern shown by a solid line in the figure).

In the present embodiment, the controller 38
At the time when the supply of the additional current I _add1 is finished, if a deviation equal to or more than a predetermined value is still recognized between the position of the valve body 12 and the target displacement, as in the case where the valve body 12 is in the process of being displaced, It is determined that step-out has occurred in the electromagnetically driven valve 10.
When the controller 38 determines that the step-out has occurred in the electromagnetically driven valve 10, the upper coil 22 and the lower coil 24
, The additional current I _add2 and the additional current I
Supply _add3 .

The actual displacement indicated by the solid line in FIG. 6A indicates a case where the electromagnetically driven valve 10 has returned to a normal state by executing the above processing. As described above, according to the electromagnetically driven valve 10 of the present embodiment, even if the electromagnetically driven valve 10 loses synchronism during the period in which the valve element 12 should be maintained at the valve open end,
The electromagnetically driven valve 10 can be quickly returned to a normal state. Hereinafter, with reference to FIG. 7 and FIG. 8, the contents of the processing for realizing the above function will be described.

FIG. 7 shows a flowchart executed by the controller 38 in order to determine whether the electromagnetically driven valve 10 has stepped out. The routine shown in FIG. 7 is a periodic interruption routine that is started every predetermined time. When the routine shown in FIG. 7 is started, first, the process of step 100 is executed. In step 100, the actual displacement of the valve body 12 is detected based on the output signal of the position sensor 36.

In step 102, the target displacement of the valve body 12 is detected. The controller 38 stores the displacement of the valve body 12 as a target displacement in a normal state. The controller 38 detects the target displacement by referring to the above-mentioned stored contents based on the time when the valve opening or closing is requested and the elapsed time from that time. In step 104, a difference (deviation) between the actual displacement of the valve body 12 and the target displacement is calculated, and it is determined whether or not the calculated value is equal to or greater than a predetermined threshold value ( _TH ). As a result, if the above difference is equal to or greater than the threshold T _H, the process of step 106 is performed. On the other hand, if the deviation is determined to be less than the threshold T _H, the process of step 108 is performed.

In step 106, a process for turning the step-out flag on is executed. The step-out flag is a flag for displaying a state in which the electromagnetically driven valve 10 is out of step and a state in which the electromagnetically driven valve 10 is out of step. When the process of step 106 ends, the current routine ends. In step 108, processing for turning off the step-out flag is executed. This step 108
Is completed, the current process is terminated. According to the above processing, the threshold value T _H is set between the actual displacement and the target displacement.
When the above deviation occurs, the step-out flag can be reliably turned on.

FIG. 8 shows a function of preventing the step-out of the electromagnetically driven valve 10 in the process of displacing the valve body 12 toward the valve opening end, and promptly when the step-out of the electromagnetically driven valve 10 occurs. 2 shows a flowchart of an example of a main routine executed by the present system in order to realize a function of demodulating the operation of the electromagnetically driven valve 10 to a normal state. The routine shown in FIG. 8 is repeatedly started each time the processing is completed. When the routine shown in FIG. 8 is started, first, the process of step 110 is executed.

In step 110, it is determined whether or not opening of the electromagnetically driven valve 10 is required. The process of step 110 is repeatedly executed until it is determined that the above condition is satisfied. As a result, when it is determined that the valve opening request has been made, the process of step 112 is executed thereafter. In step 112, the above-mentioned F / F control for changing the exciting current supplied to the lower coil 24 in a preset pattern is started. According to the above processing,
By changing the excitation current supplied to the lower coil 24, the valve body 12 can be operated to open the valve reliably and quietly.

At step 114, it is determined whether or not the step-out flag is on. As a result, if it is determined that the out-of-step flag is in the ON state, then step 11
6 is executed. On the other hand, when it is determined that the step-out flag is not in the on state, the process of step 124 described later is executed. In step 116, the additional current I _add1
Output control is performed. The additional current I _add1 output control is control for supplying the additional current I _add1 to the lower coil 24 at a predetermined timing.

In step 118, it is determined again whether or not the step-out flag is on. As a result,
If it is determined that the step-out flag is on, the process of step 120 is executed next. On the other hand, when it is determined that the step-out flag is not in the on state, the process of step 124 described later is executed. In step 120, output control of the additional current I _add2 is executed. The additional current I _add2 output control is control for supplying the additional current I _add2 to the upper coil 22 at a predetermined timing.

In step 122, output control of the additional current I _add3 is executed. The additional current I _add3 output control is control to supply the additional current I _add3 to the lower coil 24 at a predetermined timing. In step 124, it is determined whether or not the electromagnetically driven valve 10 is required to close. As a result, if it is determined that valve closing is not required,
The processing of step 114 is performed again. On the other hand, if it is determined that valve closing has been requested, the process of step 126 is executed next.

At step 126, a process for ending the F / F control is executed. After the process of step 126 is performed, the supply of the exciting current to the lower coil 24 necessary for the valve opening operation of the electromagnetically driven valve 10 is stopped thereafter. When the processing of step 126 ends, the current processing ends. According to the above-described processing, the step-out of the electromagnetically driven valve 10 can be prevented from occurring. Further, when the step-out of the electromagnetically driven valve 10 occurs, the electromagnetically driven valve 10
Out of step can be eliminated. Therefore, according to the control device of the present embodiment, the internal combustion engine equipped with the electromagnetically driven valve 10 can be properly operated.

In the above embodiment, the same additional current is generated in the displacement process of the valve body 12 and the holding process of the valve body 12. However, the present invention is not limited to this. Instead, both may be provided with different additional currents. In the embodiment described above, the upper core 18
The upper coil 22 and the lower core 20 and the lower coil 24 are connected to the above-described “electromagnet” by the upper spring 30.
The lower spring 32 corresponds to the above-mentioned “elastic body”.

Further, the controller 38 controls the position sensor 3
6. The "displacement detecting means" of claim 1 detects the displacement of the valve element 12 based on the output signal of step 6, and executes the processing of step 116 and step 122. "First additional current means"
By executing the processing of step 118, the “step-out detecting means” according to claim 2 can execute the step 1
The "second additional current means" according to the second aspect is realized by executing the processing of the twentieth aspect.

[0048]

As described above, according to the first aspect of the invention, the step-out of the valve body can be prevented beforehand while maintaining the power saving characteristics of the electromagnetically driven valve. According to the second aspect of the present invention, after step-out occurs in the electromagnetically driven valve, step-out of the electromagnetically driven valve can be eliminated at an early stage, and a normal opening / closing operation can be restored.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an electromagnetically driven valve control device according to an embodiment of the present invention.

FIG. 2A is a time chart of valve displacement during normal operation. FIG. 2B is a time chart of the upper coil exciting current. FIG. 2C is a time chart of the lower coil exciting current.

FIG. 3 (A) is a time chart of valve displacement when an electromagnetically driven valve is about to lose synchronism in the course of displacement of a valve element. FIG. 3B is a time chart of the exciting current.

FIG. 4 (A) is a time chart of valve displacement in the case where the electromagnetically driven valve loses synchronism in the process of displacing the valve element. FIG. 4B is a time chart of the upper coil exciting current. FIG. 4C is a time chart of the lower coil exciting current.

FIG. 5A is a time chart of valve displacement when the electromagnetically driven valve is out of synchronization during a period in which the valve element is to be maintained after opening. FIG. 5B is a time chart of the lower coil exciting current.

FIG. 6A is a time chart of valve displacement in a case where the electromagnetically driven valve loses synchronism during a period in which the valve element is to be maintained after opening. FIG. 6B is a time chart of the upper coil exciting current. FIG. 6 (C)
It is a time chart of a lower coil exciting current.

FIG. 7 is a flowchart of a control routine executed to process a step-out flag in the controller shown in FIG. 1;

FIG. 8 is a flowchart of a main routine executed in the controller shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electromagnetic drive valve 12 Valve element 16 Armature 18 Upper core 20 Lower core 22 Upper coil 24 Lower core 30 Upper spring 32 Lower spring 36 Position sensor 38 Controller 40 Driver

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 41/22 320 F02D 41/22 320 (72) Inventor Takashi Deo 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tatsuo Iida 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Hiroyuki Hattori 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Masahiko Asano Aichi 1 Toyota Town, Toyota City, Japan

Claims (2)

[Claims] 1. A control device for an electromagnetically driven valve that opens and closes a valve body by causing a pair of electromagnets and a pair of elastic bodies to cooperate with each other, wherein: a displacement detection unit that detects a displacement of the valve body; A first additional current means for increasing an exciting current supplied to the electromagnet when a deviation between the obtained displacement amount and a target displacement amount is equal to or larger than a threshold value. apparatus. 2. The control device for an electromagnetically driven valve according to claim 1, wherein: a step-out detecting means for detecting step-out of the valve element; And a second additional current means for applying an exciting current to the electromagnet on the side of the electromagnetically driven valve.