JP2003314232A - Internal combustion engine with phase-controlled initial drive of solenoid drive valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control an armature so as to be softly seated on a solenoid coil or core at the final stage with high assurance by smaller power consumption of the initial drive of the solenoid drive valve of an internal combustion engine. <P>SOLUTION: The internal combustion engine comprises: the solenoid drive valve having a valve disc, first and second solenoid drive means, and first and second springs; and a valve opening/closing control means for controlling the opening/closing of the valve by controlling the energization of the first and second solenoid drive means. In this engine, the valve opening/closing control means is controlled so as to start supplying of exciting current to an electromagnetic coil via a predetermined phase transition from the start of the motion of the armature toward the coil at the initial drive time for bringing the valve from the stopping state to the operating state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine having an electromagnetically driven valve for controlling the opening / closing of an intake port or an exhaust port, and more particularly to an improvement relating to an initial drive performed when the operation of the electromagnetically driven valve is started.

[0002]

2. Description of the Related Art It has long been considered to control opening / closing of an intake port or an exhaust port of an internal combustion engine by an electromagnetically driven valve. For intake valves and exhaust valves of internal combustion engines, there are individual demands for the timing of opening the valve, the period of maintaining the opened valve in the open state, the timing of closing the valve, and the period of maintaining the closed valve in the closed state. . A valve body, a first electromagnetic drive means for selectively urging the valve body toward the valve opening position, and a second electromagnetic drive means for selectively urging the valve body toward the valve closing position;
An electromagnetically driven valve having a structure having a first spring for urging the valve element away from the valve opening position and a second spring for urging the valve element away from the valve closing position has a valve opening timing, Since the valve opening period, valve closing timing, and valve closing period can be controlled individually,
This structure is often used as an intake valve and an exhaust valve of an internal combustion engine.

In the electromagnetically driven valve having the basic structure as described above, the armature of the electromagnetically driven means which is connected to the valve body to drive the valve body when not operated is the electromagnetic coil of the first and second electromagnetically driven means. Since it is in a neutral position apart from both of the above and is in a state in which it is difficult to respond to the magnetic force generated by the electromagnetic coil, when starting the operation of the electromagnetically driven valve, the valve body and armature should be connected to the first and second electromagnetic coils. A pulse current synchronized with the natural vibration of the vibration system formed by the mass of the moving body and the first and second springs is supplied, the displacement of the armature is increased by utilizing the resonance of the vibration system, and the armature is Initial driving is performed to bring the magnetic flux into the state of being attracted to the first or second electromagnetic coil. Regarding such initial drive, there are various problems such as the natural frequency of the moving body composed of the armature and the valve body being changed by the frictional resistance in the support portion of the valve shaft, and it is necessary to deal with these problems. JP-A-2000-304154, JP-A-2001-32
9815 and Japanese Patent Laid-Open No. 10-288014.

[0004]

As described above, the vibration system in which the electromagnetic coil of the first and second electromagnetic drive means is constituted by the mass of the moving body composed of the valve body and the armature and the first and second springs. For the initial drive that supplies a pulse current that is synchronized with the natural vibration of the, increases the displacement of the armature by utilizing the resonance of the vibration system, and brings this into the state of being attracted to the first or second electromagnetic coil, How to achieve it with less power consumption, higher reliability, and more softly seating the armature on the electromagnetic coil or electromagnetic core at the final stage is a constant challenge. Is.

The present invention addresses the above problems when using an electromagnetically driven valve as an intake valve or an exhaust valve of an internal combustion engine,
It is an object of the present invention to provide an improved internal combustion engine for controlling the operation of an electromagnetically driven valve so that this can be achieved to a higher degree.

[0006]

In order to solve the above problems, the present invention provides a valve body, a first electromagnetic drive means for selectively energizing the valve body toward an open position, and the valve. Second electromagnetic drive means for selectively energizing the body toward the valve closed position,
An electromagnetically driven valve having a first spring for biasing the valve element in a direction away from the valve opening position, and a second spring for biasing the valve element in a direction away from the valve closing position; An internal combustion engine having a valve opening / closing control means for controlling opening / closing of the electromagnetically driven valve by controlling energization to the first and second electromagnetically driven means, wherein the valve opening / closing control means sets the electromagnetically driven valve to At the time of initial drive from the stopped state to the operating state, the exciting current is supplied to at least one of the electromagnetic coils of the first and second electromagnetic drive means in a predetermined phase after the armature starts moving toward the electromagnetic coil. The present invention proposes an internal combustion engine characterized by having a function of controlling to start after a transition.

The valve opening / closing control means may increase the predetermined phase transition as the armature amplitude increases. In this case, the phase transition is managed as a delay time for delaying the supply of the exciting current, and the delay time may be increased according to the increase in the amplitude of the armature, or the phase transition is managed as the pulse width of the exciting current,
The pulse width may be reduced as the armature amplitude increases.

The valve opening / closing control means controls the start of the supply of the exciting current to the electromagnetic coil after a predetermined phase transition after the armature starts moving toward the electromagnetic coil, and the amplitude of the armature is predetermined. It may start after increasing the value or more.

Furthermore, the valve opening / closing control means controls the supply of an exciting current to the electromagnetic coil to start after a predetermined phase transition after the armature starts moving toward the electromagnetic coil. For each of the second electromagnetic drive means, each time the energization of the first and second electromagnetic coils is alternately switched, the predetermined phase transition is increased in accordance with the increase in the amplitude of the armature at that time. May be

[0010]

As described above, the valve element, the first electromagnetic drive means for selectively urging the valve element toward the valve opening position, and the valve element selectively toward the valve closing position. Second electromagnetic drive means for urging, a first spring for urging the valve element away from the valve opening position, and a second spring for urging the valve element away from the valve closing position In an electromagnetically driven valve, when the armature is in a phase of its vibration phase, for example, toward the first electromagnetic coil, the armature is initially at the most distant position in the phase with respect to the first electromagnetic coil. It is in. In this case, both the armature separation relative to the first or second magnet coil is valve lift during the initial drive and while the armature is located near the center between the first and second magnet coils. However, as the amplitude of the armature gradually increases, the distance from the electromagnetic coil to which the armature should be aimed at at the starting point of each of the reciprocating phases increases as the amplitude increases. However, since the electromagnetic attractive force generally weakens in inverse proportion to the square of the distance, when the amplitude of the armature increases, the armature is separated from the electromagnetic coil by a greater amount in the initial part of pulse energization in that phase. The effect of contributing to the acceleration of the armature when it is in a mere state is gradually reduced.

In this respect, according to the present invention, as described above, the supply of the exciting current to the electromagnetic coil may be started after a predetermined phase transition from the movement of the armature toward the electromagnetic coil. For example, even if the vibration amplitude of the armature becomes large, it is possible to efficiently operate the armature electromagnetically by avoiding the inefficient operation of the electromagnetic coil in the part where the armature is separated from the electromagnetic coil during the vibration phase. The electric power required for the initial drive of the electromagnetically driven valve, even if it takes a little longer for the armature to reach the state of being attracted to either the first or the second electromagnetic coil. The consumption can be reduced.

Further, if the supply of the exciting current to the electromagnetic coil is controlled so as to be started after a predetermined phase transition after the armature starts moving toward the electromagnetic coil as described above, the predetermined period of the previous period is determined. By appropriately controlling the phase transition, it is possible to incorporate a time factor in the control of the electromagnetic driving force for the armature, and at the end of the initial drive, the armature violently collides with the electromagnetic coil or core and rebounds. And the armature can be soft landed on the electromagnetic coil or core at the end of the initial drive.

At the time of initial drive for bringing the electromagnetically driven valve from the stopped state to the operating state as described above, the armature supplies the exciting current to the electromagnetic coil of at least one of the first and second electromagnetic driving means to the electromagnetic coil. In controlling to start after a predetermined phase transition after starting the motion, the predetermined phase transition is increased as the amplitude of the armature increases, or the control start is set to the amplitude of the armature or more. After that, the predetermined phase transition is performed every time the energization of the first and second electromagnetic coils is switched alternately. The particular effect obtained by increasing the armature amplitude in accordance with the above will be apparent from the following description of the embodiments.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 attached herewith is a longitudinal cross-sectional view showing an exploded view of an example of an electromagnetically driven valve which is the object of operation control according to the present invention. The electromagnetically driven valve constitutes an intake valve or an exhaust valve that opens and closes an intake port or an exhaust port of the internal combustion engine in the manner shown in the figure.

In FIG. 1, the electromagnetically driven valve is shown mounted on an intake or exhaust port of an internal combustion engine E having a known structure. In the drawing, a valve housing generally indicated by 10 includes a valve shaft guide portion 12, a lower spring housing portion 14, a lower electromagnetic core 16, and an upper electromagnetic core 1.
8, a core assembly housing part 20, and an upper spring housing part 22. The valve shaft 24 is slidably guided through the inside. At the tip of the valve shaft, the internal combustion engine E
A valve disc 28 for opening and closing the intake port or the exhaust port 26 is provided. The valve element in which the valve disc 28 is supported by the valve shaft 24 is referred to herein as the valve body. Valve shaft 2
An armature 30, a lower spring seat 32, and an upper spring seat 34, which are located between the lower electromagnetic core 16 and the upper electromagnetic core 18, are fixed to 4.

Lower electromagnetic core 16 and upper electromagnetic core 18
Is provided with a lower electromagnetic coil 36 and an upper electromagnetic coil 38 in each annular groove. An annular cover plate 40 is attached to the upper end of the upper spring housing portion 22. A lower coil spring 42 is provided between the lower spring housing portion 14 and the lower spring seat 32, and an upper spring seat 34 and the cover plate 4 are provided.
An upper coil spring 44 is mounted between 0. Excitation (energization) of the lower electromagnetic coil 36 and the upper electromagnetic coil 38 is controlled by the valve opening / closing control means 46 having a control calculation function by a microcomputer in the manner described below. The movement of the valve body consisting of the valve shaft 24 and the valve disc 28 and the armature 30 is as follows.
The distance sensor 48 using a semiconductor laser detects the displacement of the reflection plate 50 mounted on the upper spring seat 34, and the information is sent to the valve opening / closing control means 46.

The spring forces of the lower coil spring 42 and the upper coil spring 44 are such that the armature 30 acts on the valve disc 28 and other valve moving bodies when the internal combustion engine is stopped, and the lower coil spring 42 and the upper coil spring 44 have the same force. 44
Under the balance of the spring force of, the valve disc 28 is set at an intermediate position equidistant from the lower electromagnetic core 16 and the upper electromagnetic core 18 as shown in the figure. It is in an intermediate state between the fully closed state and the fully open state.

FIG. 2 shows a procedure in which the electromagnetically driven valve is initially driven according to the present invention when the internal combustion engine is started using the electromagnetically driven valve having the basic structure shown in FIG.
FIG. 6 is a diagram showing examples of energization of the upper electromagnetic coil 38 (upper excitation), energization of the lower electromagnetic coil 36 (lower excitation), and displacement of the valve disc 28 and the armature 30 (valve displacement). When the operation control of the initial valve drive by the valve opening / closing control device 46 is started at time 0, the moving body including the armature and the valve body starts from the upper electromagnetic coil and alternates between the upper electromagnetic coil and the lower electromagnetic coil. In the figure, pulse currents having half the duration of the natural vibration period synchronized with the natural vibration of the vibration system constituted by the mass of the above and the upper and lower springs are pulse (1), (2), (3). ． ． Is supplied in the on-off progress as shown as. As a result, the moving body composed of the armature and the valve body resonates with the reversal of the exciting force and gradually increases its amplitude.

In this case, in the illustrated example, up to about the pulse current (6), even if it is applied from the beginning of each phase width corresponding to half of the natural oscillation period, the armature is still near the rest neutral position. Yes, it is not far apart than the electromagnetic coil it is trying to attract. However, when the pulse current (7) is reached, at the starting point a of the phase, the armature is located far away from the upper electromagnetic coil that is about to attract it, and the distance As it increases, the magnetic attraction effect of the upper electromagnetic coil on the armature decreases.

Therefore, at this time, according to the present invention, the energization of the pulse current (7) is started by the control judgment of the valve opening / closing control means 46 based on the information on the phase position of the valve detected by the distance sensor 48. Delaying to the phase position of b is performed. In order to make such a determination, the valve opening / closing control means 46 may incorporate a map for obtaining the above-mentioned phase delay corresponding to the absolute value of the amplitude as shown in FIG. 3, for example. When the amplitude Aa at the point a increases above the predetermined threshold value As, the phase delay value D that delays the start of the pulse current supply correspondingly.
You can ask for a. Similarly, the energization start phase position of the pulse current (8) is delayed from the phase position of the point c to the phase position of the point d based on the amplitude at the point c. Hereinafter, even in the pulse current (8) to (13),
The phase position at which the energization of the pulse current starts is the point e.g. from the normal cycle start position. It is delayed to the phase position indicated by f, g, h, i.

It should be noted that the phase position at which the energization of the pulse current is started is defined by points b, d, e ,. ． ． As described above, since it corresponds to reducing the pulse width of the pulse current, the control mode is as follows.
Instead of the map for obtaining the phase delay corresponding to the absolute value of the amplitude as shown in FIG. 3, the control for obtaining the pulse width corresponding to the absolute value of the amplitude as shown in FIG. May be done. Also in this case, the reduction of the pulse width may be performed when the amplitude of the armature increases above the predetermined threshold value As.

In the illustrated example, the energization start phase positions of the pulse current (13) at the end of the initial drive and the pulse current (12) immediately before it are indicated by points i and h, respectively. As shown in the figure, it is greatly delayed by more than half a cycle from the starting point of the normal cycle, and the electromagnetic driving force exerted on the armature in the final stage of the initial drive is generated after the armature comes very close to the electromagnetic coil. . In this way, energization contributes to the driving of the armature with high efficiency from the beginning by allowing the supply of the pulse current to the electromagnetic coil to be started after the armature comes very close to the electromagnetic coil that exerts an attractive force on it. , The power consumption required for the initial drive of the electromagnetically driven valve is reduced, and at the same time, when the armature abuts and seats on the first or second electromagnetic coil or electromagnetic core at the end of the vibration, it is done softly. The generation of vibration and noise due to the armature violently colliding with the electromagnetic coil or the electromagnetic core is avoided.

In the diagram showing the valve displacement shown in FIG. 2, the broken line shows the valve displacement when the pulse current is started at the regular cycle start phase position as in the prior art. In this case, the initial drive ends with the pulse current (11), for example. By comparison with this, by applying the present invention,
Further pulse currents (12) and (13) will be required, but as will be understood from the schematic representation of the figure, the amount of power saved by the invention, namely pulse currents (7)-(11). The difference between the areas of the white areas in () minus the areas of the pulse currents (12) and (13) is clearly positive, thus the present invention saves the power consumption required for the initial drive.

Further, when the energization of the pulse current is started at the regular cycle start position as in the conventional case, a strong acceleration force is applied to each pulse current even after the amplitude of the armature is increased. Therefore, the armature may violently collide with the electromagnetic coil or the electromagnetic core at the end point j of its vibration or at the vertex k immediately before that, causing vibration and noise. On the other hand, according to the present invention, by appropriately delaying the energization start phase position of the pulse current according to the degree of increase in the amplitude of the armature, and appropriately reducing the acceleration force applied to the armature, the armature can be reduced in vibration. It can be soft seated on the electromagnetic coil or core at the end.

Although the present invention has been described above in detail with reference to one embodiment, it will be apparent to those skilled in the art that various modifications can be made to these embodiments within the scope of the present invention. .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an exploded view of an example of an electromagnetically driven valve which is an object of operation control in an internal combustion engine according to the present invention.

FIG. 2 is a diagram illustrating an electromagnetically driven valve for starting operation of an internal combustion engine.
The line diagram which shows an example of the point brought to a completely closed state from the stopped state in the middle of opening and closing by the initial drive according to the present invention.

FIG. 3 is a map showing an example of how to set a phase delay that delays the start of energization of a pulse current to an electromagnetic coil in correspondence with an absolute value of an armature amplitude.

FIG. 4 is a map showing an example of a procedure for setting the pulse width of the pulse current supplied to the electromagnetic coil in correspondence with the absolute value of the amplitude of the armature.

[Explanation of symbols]

10 ... Valve housing 12 ... Valve shaft guide 14 ... Lower spring housing part 16 ... Lower electromagnetic core 18 ... Upper electromagnetic core 20 ... Core assembly housing part 22 ... Upper spring housing part 24 ... Valve shaft 24 26 ... Intake port or exhaust port 26 28 ... Valve disc 30 ... Armature 32 ... Lower spring seat 34 ... Upper spring seat 36 ... Lower electromagnetic coil 38 ... Upper electromagnetic coil 40 ... Lid plate 42 ... Lower coil spring 44 ... Upper coil spring 46 ... Valve opening / closing control means 48 ... Distance sensor 50 ... Reflector

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Claims (6)

[Claims] 1. A valve body, a first electromagnetic drive means for selectively urging the valve body toward a valve opening position, and a second electromagnetic drive means for selectively urging the valve body toward a valve closing position. An electromagnetically driven valve having an electromagnetic drive means, a first spring for urging the valve element away from the valve opening position, and a second spring for urging the valve element away from the valve closing position; An internal combustion engine having valve opening / closing control means for controlling opening / closing of the electromagnetically driven valve by controlling energization of the electromagnetically driven valve to the first and second electromagnetically driven means, wherein the valve opening / closing control means comprises: During the initial drive that brings the electromagnetically driven valve from the stopped state to the operating state, the excitation current is supplied to the electromagnetic coil of at least one of the first and second electromagnetic drive means, and the armature starts the movement toward the electromagnetic coil. Through a predetermined phase transition from Internal combustion engine, characterized in that it has a function of controlling to start. 2. The internal combustion engine according to claim 1, wherein the valve opening / closing control means is adapted to increase the predetermined phase transition as the amplitude of the armature increases. 3. The internal combustion engine according to claim 2, wherein the phase transition is managed as a delay time for delaying the supply of the exciting current, and the delay time is increased according to an increase in the amplitude of the armature. 4. The internal combustion engine according to claim 2, wherein the phase transition is managed as a pulse width of an exciting current, and the pulse width is reduced as the amplitude of the armature increases. 5. The valve opening / closing control means controls the start of supply of an exciting current to the electromagnetic coil after a predetermined phase transition after the armature starts moving toward the electromagnetic coil, the amplitude of the armature being predetermined. The internal combustion engine according to any one of claims 1 to 4, wherein the internal combustion engine is started after being increased to a value or more. 6. The valve opening / closing control means controls the supply of an exciting current to the electromagnetic coil to start after a predetermined phase transition after the armature starts moving toward the electromagnetic coil. Each time the energization of the two electromagnetic coils is switched alternately, both the first and second electromagnetic drive means are carried out and the predetermined phase transition is performed.
The internal combustion engine according to any one of claims 1 to 5, wherein the internal combustion engine is configured to increase in response to an increase in the amplitude of the armature at that time.