JPH08200025A - Electromagnetically driven valve controller - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a device for driving a plurality of electromagnetically driven valves, which are arranged in one cylinder as intake or exhaust valves, in different combinations according to operating states of an internal combustion engine,
The objective is to maintain a smooth operating state during the transitional period of combination change. [Structure] A plurality of electromagnetically driven valves constituting a main / sub intake valve and a main / sub exhaust valve are arranged in one cylinder of an internal combustion engine. As a general rule, depending on the operating state of the internal combustion engine (I)
In the region, only the sub intake valve is controlled, in the (II) region, only the main intake valve is controlled, and in the (III) region, both the main and sub intake valves are controlled to open and close. The predetermined period after the operating region of the internal combustion engine has shifted to a different region, is determined to be a transitional period of switching the operating region,
The opening time of the main and auxiliary intake valves is gradually changed so that the intake characteristics do not change suddenly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetically driven valve control device, and more particularly, to a plurality of electromagnetically driven valves arranged in one cylinder as intake valves or exhaust valves of an internal combustion engine.
The present invention relates to an electromagnetically driven valve control device that opens and closes in appropriate combinations depending on the operating state of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in an internal combustion engine for a vehicle,
A technique is known in which an intake valve or an exhaust valve of an internal combustion engine is configured by an electromagnetically driven valve that operates by using an electromagnetic force generated by an electromagnetic coil as a drive source.

Further, as an apparatus using such a technique, for example, Japanese Patent Laid-Open No. 3-242409 discloses a cylinder of an internal combustion engine in which two electromagnetically driven valves, large and small, are provided as exhaust valves, and the electromagnetically driven valves are small at high load. A device for opening a valve (hereinafter, referred to as a sub valve) prior to a large valve (hereinafter, referred to as a main valve) is disclosed.

That is, the exhaust valve of the internal combustion engine is a valve that opens when the combustion pressure remains in the combustion chamber, and is low at high load when the combustion pressure remaining in the combustion chamber is relatively high. Greater force is required to open the exhaust valve than when loaded. On the other hand, in the device described in the above publication, when the high combustion pressure remains, the auxiliary valve that can be opened with a comparatively small force even if the combustion pressure is high is first opened to burn the combustion pressure. By reducing the pressure and then opening the main valve, the energy required to open the exhaust valve is saved.

[0005]

By the way, in the above publication, the main contents of the main valve when the internal combustion engine shifts to a high load state are the control contents of a plurality of electromagnetically driven valves arranged as exhaust valves in one cylinder. Only the control for switching from the state in which only the opening / closing drive is performed to the state in which both the main valve and the sub valve are opened / closed is disclosed, and the control content during the transition period is not disclosed at all.

On the other hand, in the case where a plurality of valves are arranged in one cylinder, if the number and combination of valves to be opened / closed change, the ventilation at the time of valve opening before and after the change. There are gradual differences in characteristics.
Therefore, as in the above-mentioned conventional device, the main valve is opened and closed without controlling the transient characteristics,
Also, when the state is changed to the state of controlling the opening and closing of the sub valve, the exhaust characteristics change suddenly before and after that.

In the internal combustion engine for vehicles, a technique is known in which a plurality of intake valves are arranged in one cylinder in order to secure a high intake capacity. In addition, if the valve to be opened / closed is switched without considering the transient characteristic as described above, the drivability of the vehicle may be deteriorated due to the change in the intake characteristic before and after the switching.

In this sense, the control contents of the electromagnetically driven valve in the above-mentioned conventional device are not always ideal as the control contents for driving a plurality of electromagnetically driven valves arranged as intake valves or exhaust valves in one cylinder. It wasn't. The present invention has been made in view of the above points, and in controlling a plurality of electromagnetically driven valves, when switching the electromagnetically driven valves for opening / closing control, the characteristics are gradually changed before and after the switching. An object of the present invention is to provide an electromagnetically driven valve control device that solves the above problems by performing appropriate transient control.

[0009]

The above object is to combine a plurality of electromagnetically driven valves provided in one cylinder as intake valves or exhaust valves of an internal combustion engine with different combinations depending on the operating state of the internal combustion engine. In an electromagnetically driven valve control device for opening and closing, an operating state detecting means for detecting an operating state of an internal combustion engine, and the operating state detecting means detects an operating state in which a combination of the electromagnetically driven valves should be changed for a predetermined period. If not, the combination of the electromagnetically driven valves is changed by the steady state control means for controlling the plurality of electromagnetically driven valves under preset driving conditions corresponding to the operating state of the internal combustion engine and the operating state detection means. When a desired operating state is detected, the characteristics gradually change before and after the combination of electromagnetically driven valves that are opened and closed is changed for a predetermined period. As is accomplished by electromagnetic valve control device and a transient control means for controlling the plurality of electromagnetic valve is subjected to correction preset driving condition corresponding to the operation state of the internal combustion engine.

[0010]

In the present invention, the plurality of electromagnetically driven valves are the steady control means according to the operating state of the internal combustion engine,
Alternatively, the opening / closing drive is appropriately performed in different combinations according to the control contents of the transient control means.

The control by the steady control means is as follows.
The control is executed when the combination of the electromagnetically driven valves is not changed. In this case, the driving conditions of the electromagnetically driven valves are, for example, the combination of the electromagnetically driven valves to be controlled to be opened and closed, the valve opening time to be given to each electromagnetically driven valve, and the like. It is sufficient to set the optimum conditions from the power consumption of the drive valve,
It can be determined in advance in relation to the operating state of the internal combustion engine.

On the other hand, the control by the transient control means is control executed when the operating state detecting means detects an operating state in which the combination of the electromagnetically driven valves should be changed. At this time, if the combination of the electromagnetically driven valves that are controlled to open and close changes, the intake or exhaust capacity obtained when driving them under optimum conditions also changes.

Therefore, if the transient control means drives the electromagnetically driven valve based on the combination determined in relation to the operating state of the internal combustion engine, the valve opening time, etc., as in the steady control means, the internal combustion engine is driven. The operating condition of the engine will change suddenly. On the other hand, the steady control means controls the plurality of electromagnetically driven valves under a preset driving condition corresponding to the operating state of the internal combustion engine, but the transient control means,
The electromagnetically driven valve is controlled by correcting a preset driving condition so that the characteristics gradually change before and after the combination of the electromagnetically driven valves is changed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows electromagnetically driven valves 10, 20, 3 controlled by an electromagnetically driven valve control device according to an embodiment of the present invention.
The figure showing the state where 0 and 40 were assembled to the cylinder head 50 is shown.

Further, FIG. 2 shows electromagnetic drives 10 and 2 respectively.
0, 30, 40 driven main intake valve 12, auxiliary intake valve 22, main exhaust valve 32, main intake port 14 opened and closed by auxiliary exhaust valve 42, auxiliary intake port 24, main exhaust port 34, auxiliary exhaust port 44 The figure which showed the arrangement | positioning of the valve seat part of FIG.

That is, the electromagnetically driven valve control device according to the present embodiment has two main and sub intake valves 12 in one cylinder.
22 and a total of four electromagnetically driven valves 10, 20, 3 arranged to form the two main and sub exhaust valves 32, 42.
It is a device for controlling 0, 40.

As shown in FIG. 2, valve seats having the same diameter are formed in the main intake port 14 and the auxiliary intake port 24. Corresponding to this, the main intake valve 12 shown in FIG.
The auxiliary intake valve 22 and the auxiliary intake valve 22 have the same diameter.
1 is a diagram showing the electromagnetically driven valve 10 that constitutes the main intake valve 12 and the electromagnetically driven valve 20 that constitutes the auxiliary intake valve 22 in an overlapping manner. An electromagnetically driven valve 20 is present in the.

Here, in the present embodiment, the electromagnetically driven valve 1 is so arranged that the opening / closing stroke of the main intake valve 12 becomes larger than the opening / closing stroke of the auxiliary intake valve 22.
The specifications of 0 and 20 are decided. Therefore, the main intake valve 12 has a larger curtain area (the opening area formed between the valve and the valve seat when the valve is opened) than the auxiliary intake valve 22.

Further, as shown in FIG. 2, the main exhaust port 34
The valve seat diameter of is larger than the valve seat diameter of the auxiliary exhaust port 44. In response to this, as shown in FIG. 1, the main exhaust valve 32 is connected to the auxiliary exhaust valve 42.
It has a large diameter compared to.

The specifications of the electromagnetically driven valve 30 and the electromagnetically driven valve 40 are determined so that the opening / closing stroke of the main exhaust valve 32 is larger than the opening / closing stroke of the auxiliary exhaust valve 42. Therefore, in this embodiment, the main exhaust valve 32 has a remarkably larger curtain area than the auxiliary exhaust valve 42.

FIG. 3A is a front sectional view of an electromagnetically driven valve 40 which constitutes the sub exhaust valve 42 in this embodiment, and FIG. 3B shows an electromagnetically driven valve which constitutes the main intake valve 12. The front sectional drawing of 10 is shown, respectively. The electromagnetically driven valve 20 that constitutes the auxiliary intake valve 22 and the electromagnetically driven valve 30 that constitutes the main exhaust valve 32 have the same configuration as the electromagnetically driven valve 10 except that the opening / closing strokes are different, so the drawings are omitted. To do.

Here, as shown in FIGS. 3 (A) and 3 (B),
The electromagnetically driven valve 10 and the electromagnetically driven valve 40 are the same in configuration but different in physical structure. Therefore, hereinafter, the electromagnetically driven valve 10 shown in FIG.
As a representative example of 0, 20, 30, 40, the configuration and operation will be described.

As shown in FIG. 3B, the main intake valve 12
A valve shaft 52 is fixed to. The valve shaft 52 is held slidably in the axial direction by a valve guide 54, and is fixed to a plunger holder 56 at its upper end. The plunger holder 56 is a member made of a non-magnetic material, and Fe, Ni, C are provided on the outer peripheral portion thereof.
A donut-shaped plunger 58 made of a soft magnetic material having o as a base material is joined.

Above the plunger 58, a first electromagnetic coil 60 is arranged at a predetermined distance. Further, a second electromagnetic coil 62 is similarly arranged below the same with a predetermined distance therebetween. Further, a first core 64 and a second core 66 that grip the first and second electromagnetic coils 60 and 62 are arranged above and below the plunger 58.

The first and second cores 64 and 66 are both members made of a soft magnetic material, and are held in a predetermined positional relationship by an outer cylinder 68 made of a nonmagnetic material.
The first and second cores 64 and 66 have a hollow portion near the center thereof, and springs 70 and 72 for elastically supporting the plunger holder 56 in the vertical direction are housed therein. ing.

At the upper end of the first core 64, a spring guide 74 for holding the upper end of the spring 70,
Also, an adjuster 76 for adjusting the amount of deformation of the springs 70 and 72 is provided. In the present embodiment, the adjusters 76 are adjusted to balance the springs 70 and 72 so that the neutral position of the plunger 58 is at the intermediate position between the first and second cores 64 and 68.
At the neutral position of the plunger 58, the main intake valve 12 is at an intermediate position (middle open position) between fully open and fully closed.

In the electromagnetically driven valve 10 thus constructed, the first core 64, the plunger 58, and the air gap formed between the first core 64 and the plunger 58 around the first electromagnetic coil 60. A magnetic circuit is formed. Therefore, when a current is passed through the first electromagnetic coil 60, an electromagnetic force acts in the direction in which the magnetic flux circulates in the magnetic circuit and reduces the air gap, that is, in the direction in which the plunger 58 is displaced upward in FIG. To do.

On the other hand, a magnetic circuit composed of a second core 66, a plunger 58, and an air gap formed between the second core 66 and the plunger 58 is formed around the second electromagnetic coil 62. When a current is passed through the second electromagnetic coil 62, the plunger 58
The electromagnetic force acts in the direction of displacing downward in FIG.

Therefore, in the electromagnetically driven valve 10, if an electric current is alternately passed through the first electromagnetic coil 60 and the second electromagnetic coil 62, the plunger 58 is reciprocated up and down, that is, the main It is possible to operate the intake valve 12 in the opening / closing direction.

By the way, the straight line descending to the right shown in FIG. 4 represents the stroke of the main intake valve 12 and the urging force generated by the springs 70 and 72 when the stroke is "0" when the main intake valve 12 is in the fully closed state. Is expressed by using the distance between the middle open position and the fully closed position of the main intake valve 12 as a parameter.

On the other hand, a plurality of curves shown in FIG. 4 represent the relationship between the stroke of the main intake valve and the electromagnetic force acting on the plunger 58, using the value of the current flowing in the first electromagnetic coil 60 as a parameter. It is a thing. From these characteristics, firstly, if the spring constant is constant, the biasing force generated by the springs 70 and 72 becomes smaller as the distance between the middle open position and the fully closed position becomes shorter. Secondly, it is necessary to pass a large current through the first electromagnetic coil 60 in order to apply a large electromagnetic force to the plunger 58.

At this time, the main intake valve 12 in the middle open position
To move the valve to the valve closing position, always move the plunger 5
Since the electromagnetic force acting on the valve 8 must overcome the biasing force generated by the springs 70 and 72, the shorter the distance between the middle open position and the fully closed position of the main intake valve 12, that is, the main intake air The shorter the stroke length to be applied to the valve 12, the less electric power is required to drive it.

By the way, the main intake valve 1 shown in FIG.
2, and the stroke length to be given to the auxiliary intake valve 22 is a length to be determined in relation to the intake air amount to be supplied to the internal combustion engine, and the stroke length is longer than the required intake air amount can be secured. Need not be secured.

In this embodiment, as described above, the main intake valve 12 has a relatively large stroke and the auxiliary intake valve 2 has a large stroke.
The reason why a relatively small stroke is given to No. 2 is in view of this point. That is, according to the above configuration, when the intake air amount is not required to be so large in the internal combustion engine (hereinafter, referred to as low load), the main intake valve 12 is maintained in the fully closed state, and the auxiliary intake valve 22 is maintained. By driving only, it is possible to satisfy desired intake characteristics with relatively low power consumption.

When a large amount of intake air is required (hereinafter referred to as high load), the main intake valve 12 is opened or closed instead of the auxiliary intake valve 22 or together with the auxiliary intake valve 22. If this is done, the practical intake capacity will not be impaired. Here, in the present embodiment, the valve areas of the main and auxiliary intake valves 12 and 22 are set equal to secure the maximum opening area that can be ensured by the two valves, that is, when they are opened together. This is to obtain the highest intake capacity as an intake system equipped with two intake valves.

In this sense, the structure in which the main intake valve 12 and the sub intake valve 22 having different stroke lengths and the same area are used in combination as described above saves driving power while maintaining sufficient intake capacity. It means that the profit that can be realized is included. As shown in FIG. 4, when the plunger 58 and the first core 64 are in close contact with each other, a sufficiently large electromagnetic force can be obtained even if the current flowing through the first electromagnetic coil 60 is small. A very small amount of power is sufficient to maintain the main intake valve 12 in the fully closed state. Therefore, maintaining the main intake valve 12 in the fully closed state does not offset the benefit of power saving by driving only the sub intake valve 22 when the load is low.

In the present embodiment, the relationship between the main exhaust valve 32 and the sub exhaust valve 42 is that the main exhaust valve 42 has a stroke length shorter than the main exhaust valve 32. The relationship between the intake valve 12 and the auxiliary intake valve 22 is the same.

Therefore, in the structure shown in FIG. 1, when the amount of exhaust gas discharged is small, the main exhaust valve 3
If 2 is kept fully closed and only the sub-exhaust valve 42 is controlled to open / close, the power saving benefit can be obtained on the exhaust side as well. On the other hand, the relationship between the main exhaust valve 32 and the auxiliary exhaust valve 42 differs from the relationship between the main intake valve 12 and the auxiliary intake valve 22 in terms of their areas.
As described above, the area of the main exhaust valve 32 is set sufficiently larger than the area of the auxiliary exhaust valve 42.

That is, in order to secure a high intake capacity in the internal combustion engine, it is necessary to maximize the total curtain area on the intake side. For that purpose, it is advantageous to make the two valves the same area. Since securing the exhaust capacity is easier than securing the intake capacity, this configuration is adopted in view of the characteristics of the exhaust valve that opens against the combustion pressure.

That is, the auxiliary exhaust valve 42 has a small area, and therefore can be opened relatively easily even when a high combustion pressure remains in the combustion chamber. Therefore, when the main exhaust valve 32 needs to be opened, if the auxiliary exhaust valve 42 is opened prior to the opening, the main exhaust valve 42 is opened against the high combustion pressure. It is not necessary, and the exhaust valve can be opened and closed easily and reliably even under high load.

In this sense, the structure in which the main exhaust valve 32 and the sub-exhaust valve 42 having different stroke lengths and different areas are used in combination as described above is based on a principle different from that on the intake side and has a sufficient exhaust capacity. That is, it has the advantage that the drive power can be saved while maintaining the above.

The control contents relating to the driving of the electromagnetically driven valves 10, 20, 30, 40 having the structure shown in FIG. 1 will be described below. FIG. 5 is a block diagram of the electromagnetically driven valve control device according to the present embodiment. As shown in the figure, the electromagnetically driven valve control device includes an electronic control unit (ECU) 80.
Is realized by

The ECU 80 includes all the electromagnetically driven valves 10, 20, 30, constituting the main and auxiliary intake valves 12, 22 or the main and auxiliary exhaust valves 32, 42 arranged in each cylinder of the multi-cylinder internal combustion engine. 40 is connected. Where ECU
Reference numeral 80 appropriately drives the electromagnetically driven valves 10, 20, 30, 40 using a DC-DC converter 82 for boosting the 12V voltage supplied from the battery to 24V, and a 12V drive voltage and a 24V drive voltage. Drive control circuit 84
Composed of and.

The drive control circuit 84 is a main part of this embodiment, and in addition to the above-mentioned drive voltage, the engine speed NE of the internal combustion engine.
Each of the sensor outputs is supplied from the NE sensor 86 that detects the load and the load sensor 88 that detects the load state of the internal combustion engine. The load sensor 88 can be specifically realized by an intake air amount sensor that detects the intake air amount of the internal combustion engine, a throttle sensor that detects the opening of a throttle valve, or the like.

The contents of the processing executed by the drive control circuit 84 will be described below with reference to FIGS. 6 to 15.
From the above-mentioned viewpoint, the drive control circuit 84 controls the opening / closing of the electromagnetically driven valves 10, 20, 30, 40 by appropriately different combinations according to the operating state of the internal combustion engine. A 12V power source is used for the fully closed control.

In this case, the power consumption can be reduced as compared with the case where the electromagnetically driven valve is maintained in the fully closed state by using the 24V power source. Also in this sense, the electromagnetically driven valve control device according to the present embodiment has an advantage that it is advantageous for power saving. From the viewpoint described above, FIG.
A region where only the sub intake valve 22 should be opened and closed (region (I) in the figure), a region where only the main intake valve 12 should be opened and closed (region (II) in the diagram), and the main intake valve 12 and the sub 6 is a map in which a region where the intake valve 22 and the intake valve 22 are to be opened / closed (region (III) in the figure) is determined in relation to the operating state of the internal combustion engine.

From the above-mentioned viewpoint, FIG. 7 shows a region where only the sub exhaust valve 42 is to be opened / closed (region (IV) in the figure), and both the main exhaust valve 32 and the sub exhaust valve 42 are opened / closed. It is a map that defines a region to be processed (region (V) in the figure) in relation to the operating state of the internal combustion engine.

That is, in this embodiment, the minimum number of electromagnetically driven valves are driven to secure desired intake and exhaust capacities, thereby reducing the power consumption associated with the driving of the valves. , Electromagnetically driven valves 10 and 2 which are opened and closed according to the sections shown in FIGS. 6 and 7 above.
0, 30, 40 are selected.

Here, FIGS. 8A, 8B, and 8C are as follows.
The opening period of the auxiliary intake valve 22 in the (I) region, the opening period of the main intake valve 12 in the (II) region, and the main intake valve 12 in the (III) region, respectively.
And the opening period of the auxiliary intake valve 22.

These valve opening periods are the most preferable characteristics (output characteristics when the throttle valve is fully opened) for each combination of the electromagnetically driven valves 10 and 20 which are driven to open and close, in consideration of the amount of mixture blown through and the combustibility. Or an exhaust emission characteristic, etc.) is set, for example, as a fixed value or as a function of the engine speed NE.

Therefore, the drive control circuit 84 controls the opening period of the main and auxiliary intake valves 12 and 22 as shown in FIG.
When controlled at the timings shown in (C) to (C), in the (I) region shown in FIG. 6, the most excellent characteristic is obtained under the condition that only the auxiliary intake valve 22 is opened and closed. The best characteristics are obtained under the condition that only the valve 12 is opened and closed, and in (III) above, the best characteristics are obtained under the condition that both the main intake valve 12 and the auxiliary intake valve 22 are opened and closed. Become.

9A and 9B show the opening period of the auxiliary exhaust valve 42 in the above (IV) region and the opening of the main exhaust valve 32 and the auxiliary exhaust valve 42 in the above (V) region, respectively. It represents the valve period. Similar to the valve opening period shown in FIG. 8, these valve opening periods are also set for each combination of the electromagnetically driven valves 30 and 40 that are driven to be opened / closed in consideration of the amount of blown air-fuel mixture and the exhaust capacity. It's time.

Therefore, the drive control circuit 84 controls the opening period of the main and auxiliary exhaust valves 32 and 42 as shown in FIG.
When controlled at the timings shown in (A) and (B), the above-mentioned FIG.
In the region (IV) shown in (4), the most excellent characteristic is obtained under the condition that only the sub exhaust valve 42 is opened and closed.
In the region, the main exhaust valve 32 and the auxiliary exhaust valve 42
The most excellent characteristics can be obtained under the condition of opening and closing together.

By the way, as described above, the electromagnetically driven valves 10, 20, 30, 4 which open and close according to the operating state of the internal combustion engine.
When the combination of 0 is changed, excellent characteristics can be realized while reducing the power consumption required to drive the valve, but on the other hand, in the transitional period when the combination of electromagnetically driven valves that are opened and closed changes, A situation occurs in which the intake capacity or the exhaust capacity changes in stages.

That is, FIG. 10 shows the relationship between the intake air amount Q and the engine speed NE when the throttle valve is fully opened (the load L of the internal combustion engine is maximum).
As shown in the figure, when the operating region of the internal combustion engine is switched from (I) to (II) or from (II) to (III),
A sudden change occurs in the intake air amount Q.

Here, FIG. 10 exemplifies the exhaust side, but also on the exhaust side, when the operating region of the internal combustion engine is switched from (IV) to (V), the exhaust characteristic is also sharply changed. Change occurs. Therefore, if these behaviors are allowed, an unnatural behavior will occur each time the operating state of the internal combustion engine changes to different operating regions, and it will be difficult to maintain good drivability in the vehicle.

By the way, FIG. 11 shows the change state of the intake air amount Q when the main intake valve 12 and the sub intake valve 22 are both controlled to open and close in the entire rotation range.
It is a characteristic diagram showing the valve opening times of 2 and 22 as parameters, but as shown in the figure, the intake characteristic is not uniquely determined for the combination of valves to be opened and closed.

Therefore, the electromagnetically driven valve 1 shown in FIG.
Even when the open / close control is performed by appropriately changing the combination of 0, 20, 30, and 40, for example, when the operating region of the internal combustion engine changes from the (I) region to the (II) region, the main intake valve 1
2 is not opened under optimal conditions from the beginning, but if appropriate transient control is performed, such as starting from a shorter valve opening time and gradually changing to the optimal valve opening time, the intake shown in FIG. It is possible to eliminate a sudden change in the air amount Q.

Here, paying attention to this point, the electromagnetically driven valve control device of the present embodiment performs appropriate transient control so that the intake or exhaust characteristics gradually change when the operating region changes. It has characteristics. Hereinafter, the content of the transient control will be described by taking the intake side as an example.

12 to 15 are flow charts showing an example of an electromagnetically driven valve control routine executed by the drive control circuit 84 to realize the above function. It should be noted that this routine is a routine that is executed, for example, every one revolution of the engine.
When this routine is started, first, step 1 shown in FIG.
At 00, the engine speed NE is read. Next, in step 102, the load L of the internal combustion engine is read, and in step 104, which region in FIG. 6 the current operating region is in is specified based on NE and L.

Then, in steps 106 and 108,
It is determined whether the specified operating region is the (I) region or the (II) region, and if the operating region is the (I) region, then FIG.
3 to step 200, if the area is the (II) area, the processing proceeds to step 300 shown in FIG. 14, and if it is neither, the area is determined to be the (III) area and step 4 shown in FIG.
Go to 00.

FIG. 13 is a flowchart of the process executed when it is determined that the internal combustion engine is operating in the above (I) range. First, at step 200, the flag F ₂₁ is entered.
It is determined whether or not "1" is set in. Here, the flag F ₂₁ is only immediately after changing the operating region as described below from (II) region (I) region, that is, a flag which only "1" is set in the transitional operating range switching.

As a result of the above determination, if F ₂₁ = 1 is established, then steps 202 to 206 are skipped to proceed to step 208, while it is determined that F ₂₁ = 1 is not established. If so, go to step 202. Step 202 is a step of determining whether or not the operating region of the internal combustion engine was the (II) region at the time of the previous processing. As a result, if the previous processing was in the (II) region, this processing is the first processing after the operating region has been switched, and thereafter, in step 204, the flag F _{21 is set} to "1".
The main intake valve 12 in step 206.
Step 2 after substituting the predetermined time T _M1 for the valve opening time T _M of
Go to 08. Here, the predetermined time T _M1 is (I
This is the time given to the main intake valve 12 as the valve opening time when operating near the boundary with the (I) region in the I) region.

The process after step 208 is a process executed during the transitional period when the operating region is switched. First, at step 208, the valve opening time T _M of the main intake valve 12 is set.
Is shortened by a predetermined time T ₂₁ . Then, the counter N is incremented in step 210, it is determined in step 212 whether N has reached the predetermined value N ₂₁ , and if N ≧ N ₂₁ is still unsatisfied, step 214 is jumped, and already. If N ≧ N ₂₁ holds, the flag F ₂₁ is reset to “0” in step 214,
Go to step 216.

Therefore, once the flag F ₂₁ is set to "1" in step 204, then N ₂₁ is executed each time this routine is executed unless the operating region of the internal combustion engine escapes from the region (I). Only once, the opening time T _M of the main intake valve 12 is continuously subtracted by the predetermined time T ₂₁ .

After calculating the valve opening time T _M of the main intake valve 12 in the transitional period as described above, the valve opening time T _M is opened and closed in step 216 to drive the main intake valve 12 to open and close.
Output _M and end this processing. Therefore, when the operating region of the internal combustion engine changes from the (II) region to the (I) region, only the sub intake valve 22 should be opened / closed in the (I) region, but the main intake valve 12 is shortened and corrected. The opening / closing correction is performed at the valve opening time T _M.

On the other hand, if the flag F ₂₁ is reset to "0" in step 214, it is determined that F ₂₁ = 1 is not established when step 200 is executed next time. Also,
In this case, it is determined that the condition of the subsequent step 202 is also not satisfied, and thereafter, the processing of this time is ended via step 220.

That is, step 220 is a step executed when the operating region of the internal combustion engine is in the (I) region and is not in the transition period when the operating region is switched. Therefore, in this step, it is not necessary to consider the switching of the electromagnetically driven valve that is driven to open and close, and the process of driving the auxiliary intake valve 22 is executed under a predetermined optimum condition.

Here, the predetermined time T ₂₁ and the predetermined value N ₂₁
Is substantially equivalent to the characteristic obtained when the main intake valve 12 is opened and closed with the opening time of T _M = T _M1 −T ₂₁ × N _{21 and} only the auxiliary intake valve 22 is opened and closed under the optimum condition. The characteristics are set to be realized.

Therefore, the main intake valve 12 is driven with the valve opening time T _M which has been shortened and corrected for a predetermined period after the operating region is switched from the (II) region to the (I) region as described above. When it is stable in the region (I), when the auxiliary intake valve 22 is driven under the optimum condition, the characteristics do not suddenly change in the transition period when the operating region is switched, and the smooth operating state of the internal combustion engine can be maintained. Become.

FIG. 14 is a flow chart of a process executed when it is determined that the internal combustion engine is operating in the above (II) region. Further, it is determined whether step 300 in the figure, "1" in the flag F ₁₂ is set. Here, the flag F ₁₂ is a flag that is set to “1” only immediately after the operating region changes from the (I) region to the (II) region.

As a result of the above determination, if F ₁₂ = 1 is satisfied, then steps 302 to 306 are skipped and the process proceeds to step 308. On the other hand, if F ₁₂ = 1 is not established, the routine proceeds to step 302, where it is determined whether or not the operating region of the internal combustion engine was the (I) region during the previous processing.

As a result, if the previous processing was in the (I) region, this processing is the first processing after the operating region has been switched. Thereafter, in step 304, the flag F ₁₂
Is set to 1, and then in step 306, a predetermined time T _M0 is substituted for the valve opening time T _M of the main intake valve 12, and then the routine proceeds to step 308.

Here, the predetermined time T _M0 is _equal to the above-mentioned T _M =
It is the same time as T _M1 −T ₂₁ × N ₂₁ . Therefore, when the main intake valve 12 is opened / closed for the opening time T _M0 , almost the same characteristics as those obtained when only the sub intake valve 22 is opened / closed under the optimum conditions are obtained.

In step 308, a process of extending the valve opening time T _M of the main intake valve 12 by a predetermined time T ₁₂ is performed.
In step 310, the counter N is incremented, and in step 312, it is determined whether N has reached the predetermined value N ₁₂ . As a result, if N ≧ N ₁₂ is not satisfied, it is kept. If N ≧ N ₁₂ is satisfied, step 314 is performed.
After resetting the flag F ₁₂ to "0" by step 316
To open and close the main intake valve 12 to open and close.
Output _M and end this processing.

Therefore, once the flag F ₁₂ is set to "1" in the above step 304, thereafter, unless the operating range of the internal combustion engine escapes from the (II) range, N ₁₂ is returned each time this routine is executed. Only once, T _M is extended for a predetermined time T ₁₂ with T _M0 as an initial value, and the main intake valve 12 is controlled to be opened and closed at the valve opening time T _M.

That is, when the operating region of the internal combustion engine changes from the (I) region to the (II) region, the main intake valve 12 should be opened and closed under the optimum condition in the (II) region, but it is intentionally optimized. The main intake valve 12 is driven to open and close in the valve opening time T _M which is shortened and corrected from the other valve opening time.

On the other hand, if the flag F ₁₂ is reset to "0" in the above step 314 because the transitional period after the operation region is switched from the (I) region to the (II) region is escaped,
When step 300 is executed next time or later, F ₁₂ = 1
Is judged to be unsuccessful. Further, in this case, it is determined that the condition of the subsequent step 302 is also not satisfied, and step 32
The process of 0 will be executed.

Step 320 is a step for judging whether or not "1" is set in the flag F ₃₂ , which is set "1" only immediately after the operating area is changed from the (III) area to the (II) area. Is. As a result, if F ₃₂ = 1 is satisfied, then steps 322 to 326 are skipped and the process proceeds to step 328. On the other hand, if F ₂₁ = 1 is not established, the routine proceeds to step 322, where it is determined whether or not the operating region of the internal combustion engine was the (III) region at the time of the previous processing.

If the previous processing is in the (III) range, this processing is the first processing after the operating area is switched, and thereafter, in step 324, the flag F _{32 is set.}
Is set to "1", and then in step 326, a predetermined time T _S1 is substituted for the valve opening time T _S of the auxiliary intake valve 22, and then the routine proceeds to step 328.

Here, the predetermined time T _S1 is (II
This is the time given to the auxiliary intake valve 22 as the valve opening time when operating near the boundary with the (II) region in the I) region. Therefore, after the operating range of the internal combustion engine is changed to the (II) range, when the main intake valve 12 is driven to open / close under optimal conditions and the auxiliary intake valve 22 is driven to open / close for the valve opening time T _S1 , the main intake valve 12 Therefore, the characteristics substantially the same as those obtained when the sub intake valve 22 and the sub intake valve 22 are both opened and closed under the optimum conditions are obtained.

Step 328 is a step of shortening the valve opening time T _S of the auxiliary intake valve 22 by a predetermined time T ₃₂ . Further, steps 330, 332, and 334 are steps of incrementing the counter N, determining whether the counter N has reached a predetermined value N ₃₂ , and
This is a step of resetting the flag F ₃₂ only when N ≧ N ₁₂ is satisfied.

Upon completion of these processes, in step 336, a drive signal is output to open / close the main intake valve 12 under the optimum condition and the sub intake valve 22 for the valve opening time T _S. This processing ends. Therefore, once the flag F ₃₂ is set to "1" in the above step 324, thereafter, unless the operating region of the internal combustion engine escapes from the (II) region, N is returned every time this routine is executed.
Only ₃₂ times, T _S is shortened by a predetermined time T ₃₂ with T _S1 as an initial value, and the valve opening time T together with the main intake valve 12 is reduced.
_The sub intake valve 22 is controlled to be opened and closed by _S.

That is, when the operating region of the internal combustion engine changes from the (III) region to the (II) region, the main intake valve 12 should be opened and closed under the optimum condition in the (II) region. 12, the auxiliary intake valve 22 is opened and closed with the shortened valve opening time T _S.

On the other hand, if the F ₃₂ flag is reset to "0" in step 324, the transitional period after the operating region is switched from the (III) region to the (II) region is escaped.
The next time step 320 is executed, F ₃₂ = 1
Is judged to be unsuccessful. Further, in this case, it is determined that the condition of the subsequent step 322 is also not satisfied, and then the process of step 340 is executed.

That is, in step 340, the operating region of the internal combustion engine is the (II) region, and the (I) region to (I
It is not the transition period to the I) region, and also from the (III) region to the (II)
This is the step that is executed when it is not the transition period to the area. Therefore, in this step, it is not necessary to consider the characteristic change due to the switching of the electromagnetically driven valve, and the process of opening / closing only the main intake valve 12 is executed under a predetermined optimum condition.

Here, the predetermined times T ₁₂ , T ₃₂ and the predetermined values N ₁₂ , N ₃₂ are the optimum conditions for the main intake valve 12 when the valve opening time T _M is T _M = T _M0 + T ₁₂ × N _12. And T _S1 −T ₃₂ × N ₃₂ = 0 are established. Therefore, after the operating range is switched from the (I) range to the (II) range as described above,
When the transient control is performed for the valve opening time T _M of the main intake valve 12 over a predetermined period, the control for the main intake valve 12 smoothly shifts to the control in the optimum state.

Further, when the transient control is performed on the auxiliary intake valve 22 over a predetermined engine after the operating region is switched from the (III) region to the (II) region as described above, the transient control is smoothly completed. Only the main intake valve 12 is in the state of being opened and closed under the optimum condition.

Therefore, when the drive control circuit 84 performs the processing according to the flow chart shown in FIG. 14, the operating region of the internal combustion engine changes from the (I) region to the (II) region or (II).
Even when the region (I) is switched to the region (II), the fully open characteristic and the exhaust characteristic of the internal combustion engine do not suddenly change, and the smooth operating state can be maintained.

FIG. 15 is a flowchart of the processing executed when it is determined that the internal combustion engine is operating in the above (III) range. Determining whether step 400 in the figure, the operating region is (II) the flag F ₂₃ only "1" is set immediately after changing from the region (III) region "1" is set Is.

As a result, if F ₂₃ = 1 is satisfied, then steps 402 to 406 are jumped to step 40.
Proceed to 8. On the other hand, when F ₂₃ = 1 is not established, the routine proceeds to step 402, where it is judged if the operating region of the internal combustion engine was the (II) region at the time of the previous processing.

If the previous processing was in the (II) area, this processing is the first processing after the operating area is switched to the (III) area, and thereafter, in step 404, flag F is set.
₂₃ is set to "1", and then, in step 406, 0 is substituted for the opening time T _S of the auxiliary intake valve 22, and then step 4
Go to 08.

Step 408 is a step of extending the valve opening time T _S of the auxiliary intake valve 22 by a predetermined time T ₂₃ . Therefore, when this step is executed for the first time after step 406, the opening time T _S of the auxiliary intake valve 22 is
_Will be set to the predetermined time T ₂₃ .

In this case, since the predetermined time T ₂₃ is a sufficiently small value, the main intake valve 12 is opened and closed under the optimum condition, and the auxiliary intake valve 22 is opened and closed for the opening time T _S. It is possible to obtain almost the same characteristics as in the case where only the valve 12 is opened and closed under the optimum conditions.

Steps 410, 412, and 414 are steps of incrementing the counter N, determining whether the counter N has reached a predetermined value N _23, and setting the flag F ₂₃ only when N ≧ N ₂₃ is satisfied. This is the step of resetting. When these processes are completed, in step 416, the main intake valve 12 is set under the optimum condition.
Further, the drive signal is output to drive the auxiliary intake valve 22 to open and close for the valve opening time T _S , and the processing of this time is ended.

[0096] Therefore, when "1" once the flag F ₂₃ in step 404 is set, then, as long as the operating range of the internal combustion engine does not escape from (III) region, N ₂₃ every time the routine is executed Only once, T _S is extended for a predetermined time T ₂₃ with 0 as an initial value, and the sub intake valve 22 is controlled to be opened and closed together with the main intake valve 12 at the opening time T _S.

That is, when the operating region of the internal combustion engine changes from the (II) region to the (III) region, both the main intake valve 12 and the auxiliary intake valve 22 should be opened and closed under the optimum conditions in the original (III) region. However, the auxiliary intake valve 22 is driven to open / close in the valve opening time T _S corrected for shortening.

[0098] On the other hand, when F ₂₃ flag at step 404 is reset to "0" as the escaped the transition period after the switch operating region (II) to region (III) regions,
Next time step 420 is executed, F ₂₃ = 1
Is judged to be unsuccessful. Further, in this case, it is determined that the condition of the subsequent step 402 is also not satisfied, and then the process of step 420 is executed.

That is, in step 420, the operating region of the internal combustion engine is the (III) region, and the (II) region to (II
I) This is the step that is executed when there is no transition to the area. Therefore, in this step, it is not necessary to consider the characteristic change due to the switching of the electromagnetically driven valve, and the process of opening / closing both the main intake valve 12 and the auxiliary intake valve 22 under optimal conditions is executed.

Here, the above-mentioned predetermined time T ₂₃ and the predetermined value N23 are set so that the valve opening time T _S where T _S = T ₂₃ × N ₂₃ is the optimum condition for the auxiliary intake valve 22. . Therefore, after the operating region is switched from the (II) region to the (III) region as described above, when the transient control is performed for the valve opening time T _S of the auxiliary intake valve 22 for a predetermined period, the auxiliary intake valve 22 is The control of (1) smoothly shifts to the control in the optimum state.

Therefore, when the drive control circuit 84 performs the processing according to the flow chart shown in FIG. 15, even when the operating region of the internal combustion engine is switched from the (II) region to the (III) region, Fully open characteristics, exhaust characteristics, etc. do not change suddenly, and a smooth operating state can be maintained.

12 to 15 exemplify the flowchart of the process relating to the switching of the valve on the intake side in particular, however, the switching of the valve on the exhaust side is prevented by a completely similar method to prevent a sudden change in the characteristics. be able to. That is, in the present embodiment, the (IV) region in FIG. 7 is a region in which only the sub exhaust valve 42 is driven in principle, and the (V) region is in principle the main and sub exhaust valve 32,
Since 42 is set as the area to be driven together, (I
During the transition period from the (V) region to the (V) region or the transition period from the (V) region to the (IV) region, the main exhaust valve 3
If the driving is performed with the valve opening time that is shortened and corrected to 2, it is possible to always maintain a smooth operating state.

In this embodiment, the drive control circuit 8
4 executes the processing of steps 100 to 108 in FIG. 12 based on the output of the NE sensor 86 and the output of the load sensor 88, whereby the above-mentioned operating state detecting means is realized. Further, the drive control circuit 84 causes the step 22
The steady control means described above by executing the processing of 0, 340, and 420 also performs the above steps 200 to 21.
6, 300-316, 320-336, and 400-4
The transient control means described above is realized by executing the processing of 16.

[0104]

As described above, according to the present invention, a plurality of electromagnetically driven valves arranged in one cylinder are opened / closed by appropriately changing the combination in accordance with changes in the operating state of the internal combustion engine, and During the transitional period when the combination changes, transient control is performed so that the intake or exhaust capacity gradually changes.

Therefore, according to the electromagnetically driven valve control device of the present invention, the intake or exhaust capacity required according to the operating state of the internal combustion engine is secured by opening and closing the minimum number of electromagnetically driven valves. In addition, it is possible to prevent a sudden change in the intake or exhaust capacity before and after the combination of the electromagnetically driven valves that are opened and closed.

As described above, the electromagnetically driven valve control device according to the present invention achieves power saving in the entire operating range of the internal combustion engine while saving the electric power required to secure the intake or exhaust capacity required of the internal combustion engine. It has the feature of ensuring smooth operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electromagnetically driven valve driven by an electromagnetically driven valve control device of the present embodiment.

FIG. 2 is a plan view of a valve seat of an electromagnetically driven valve driven by the electromagnetically driven valve control device according to the present embodiment.

FIG. 3 is a front sectional view showing a configuration of an electromagnetically driven valve driven by the electromagnetically driven valve control device according to the present embodiment.

FIG. 4 is a characteristic diagram showing a relationship between an electromagnetic force generated in an electromagnetically driven valve and a stroke, and a relationship between an urging force and a stroke.

FIG. 5 is a block configuration diagram of an electromagnetically driven valve control device according to the present embodiment.

FIG. 6 is a diagram showing a relationship between a combination of main and auxiliary intake valves controlled to be opened and closed by an electromagnetically driven valve control device of the present embodiment and an operating state of an internal combustion engine.

FIG. 7 is a diagram showing a relationship between a combination of main and auxiliary exhaust valves controlled to be opened and closed by an electromagnetically driven valve control device of the present embodiment and an operating state of an internal combustion engine.

FIG. 8 (A) is a diagram showing a valve opening period of the auxiliary intake valve when the internal combustion engine is in a low load operation. FIG.
FIG. 6B is a diagram showing a valve opening period of the main intake valve when the internal combustion engine is in medium load operation. FIG. 8C is a diagram showing the opening period of the main and auxiliary intake valves when the internal combustion engine is operating under high load.

FIG. 9 (A) is a diagram showing a valve opening period of the auxiliary exhaust valve when the internal combustion engine is in a low load operation. Figure 9
FIG. 7B is a diagram showing a valve opening period of the main and auxiliary intake valves when the internal combustion engine is in medium-high load operation.

FIG. 10 is a diagram showing a relationship between a combination of main and auxiliary intake valves that are driven to open and close and intake characteristics.

FIG. 11 is a diagram showing a relationship between a valve opening time of a main / sub intake valve and intake characteristics.

FIG. 12 is a flowchart (part 1) of an example of an electromagnetically driven valve control routine executed by the drive control circuit in the present embodiment.

FIG. 13 is a flowchart (part 2) of an example of an electromagnetically driven valve control routine executed by the drive control circuit in the present embodiment.

FIG. 14 is a flowchart (part 3) of an example of the electromagnetically driven valve control routine executed by the drive control circuit in the present embodiment.

FIG. 15 is a flowchart (part 4) of an example of an electromagnetically driven valve control routine executed by the drive control circuit in the present embodiment.

[Explanation of symbols]

 10, 20, 30, 40 Electromagnetic drive valve 12 Main intake valve 22 Sub intake valve 32 Main exhaust valve 42 Sub exhaust valve 80 Electronic control unit (ECU) 84 Drive control circuit 86 NE sensor 88 Load sensor

Claims (1)

[Claims] 1. An electromagnetically driven valve control device for opening and closing a plurality of electromagnetically driven valves arranged in one cylinder as an intake valve or an exhaust valve of an internal combustion engine in an appropriately different combination according to the operating state of the internal combustion engine. The operating state detecting means for detecting the operating state of the internal combustion engine, and the operating state detecting means for operating the internal combustion engine when the operating state in which the combination of the electromagnetically driven valves should be changed is not detected by the operating state detecting means. In the case where an operating state in which the combination of the electromagnetically driven valves is to be changed is detected by the steady state control means for controlling the plurality of electromagnetically driven valves under preset drive conditions corresponding to the state, and the operating state detection means. ,
After that, over a predetermined period, the driving conditions set in advance corresponding to the operating state of the internal combustion engine are corrected so that the characteristics gradually change before and after the combination of the electromagnetically driven valves that are opened and closed is changed, and An electromagnetically driven valve control device comprising: a transient control means for controlling the electromagnetically driven valve.