JPH0392518A - Solenoid valve driving device - Google Patents

Abstract

PURPOSE:To obtain stable movement by forming a progressive magnetic field of magnetic poles parallelly arranged on a secondary coil of a movable body, driving an intake/discharge valve by means of solenoid force which induction current of the secondary coil from the progressive magnetic field, and initially driving a magnetic plate which abuts against the magnetic plate. CONSTITUTION:Opening/closing timings of an intake valve 1 is computed by a controller 5 according to each of detection signals from a rotational sensor 51 and a load sensor 53 during operation of an engine. When a crank angle detected by a position sensor 52 shows a required timing, electric supply to an upper electromagnet is suspended by the controller 5. On the other hand, electric current is supplied to a lower electromagnet 3 to attract a magnetic plate 41. The magnetic plate 41 is then abutted against a movable body 11, and the intake valve 1 is initially driven in an opening direction. An alternating current is supplied to a plurality of coils 23 to apply a progressive magnetic field to the movable body 11 in the opening direction. The intake valve 1 is thus driven in the opening direction by means of solenoid force which induction current of a secondary coil 13 receives from the progressive magnetic field.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic force valve control device that opens and closes intake and exhaust valves of an engine using electromagnetic force.

(Prior art) A conventional intake/exhaust pulp opening/closing drive device pushes the IIHlfg surface of the valve via a link mechanism such as a rocker arm or a pushing rod from the cam surface of a camshaft that rotates in synchronization with the engine rotational phase. This opens and closes the intake and exhaust valves, which are always biased in the closing direction by springs. The opening/closing drive device requires a camshaft and a link mechanism to be attached to the engine, which increases the size of the engine and consumes a portion of the engine output due to frictional resistance when driving the camshaft and link mechanism. Effective output decreases.

Also, since the opening and closing timing of the intake and exhaust valves cannot be changed while the engine is running, the valve opening and closing timing must be adjusted to match the specified engine speed. Therefore, there is a problem in that the output and efficiency of the engine decrease when the engine is operated at a rotation speed different from the predetermined rotation speed.

In order to solve the above problem, a device for opening and closing the intake and exhaust valves using electromagnetic force using an electromagnet instead of using a camshaft is disclosed in Japanese Patent Laid-Open No. 58-183805 or Japanese Patent Laid-Open No. 61-76713. It is stated in the official gazette.

(Problem to be Solved by the Invention) However, the device disclosed in the above two publications attracts a magnetic body attached to an intake/exhaust valve with an electromagnet disposed in the direction of movement of the intake/exhaust valve, and uses the attraction force to It drives the intake and exhaust valves. By the way, the attractive force acting on the magnetic material is inversely proportional to the square of the distance between the electromagnet and the magnetic material, so in the above device, the attractive force changes as the distance changes, making the drive of the intake and exhaust valves unstable. There's a problem. Furthermore, when starting the drive, it is necessary to apply a strong acceleration force to the intake and exhaust valves, but in the devices disclosed in the above two publications, the distance between the electromagnet and the magnetic body is maximum at the start of the drive, and therefore the intake and exhaust valves Only the minimum driving force can be applied.

The present invention has been made in view of the above points, and is capable of stably controlling the opening and closing of the intake and exhaust valves without being affected by the movement of the intake and exhaust valves, and in which the driving force acting on the intake and exhaust valves is not affected by the movement of the intake and exhaust valves. The aim is to provide an electromagnetic valve drive device that can sometimes apply strong driving force to intake and exhaust valves. (Means for Solving the Problems) According to the present invention, a movable magnetic pole that is connected to an intake and exhaust valve of an engine and can freely reciprocate, and a movable magnetic pole that faces a side surface of the movable magnetic pole and are arranged in parallel in the reciprocating direction C of the movable magnetic pole. a plurality of fixed magnetic poles,
a coil that is wound around the fixed magnetic pole and forms a traveling magnetic field in the reciprocating direction when the intake/exhaust valve is open; a secondary coil that is arranged around the side surface of the movable magnetic pole and faces the fixed magnetic pole; and a secondary coil that moves in the reciprocating direction. a movable magnetic plate that is freely movable and faces the end face of the movable magnetic pole; an electromagnet that faces the movable magnetic plate and attracts the movable magnetic plate and brings it into contact with the movable magnetic pole to drive the intake/exhaust valve; It is possible to provide an electromagnetic valve drive device characterized by having a control means for controlling the energization state and driving the intake and exhaust valves to open and close. (Function) In the electromagnetic valve drive device of the present invention, a traveling magnetic field is formed by the magnetic poles arranged in parallel on the side surface of the secondary coil surrounding the mover, and the current induced in the secondary coil is received from the traveling magnetic field. Since the intake and exhaust valves are driven by electromagnetic force, the driving force does not change even if the position of the intake and exhaust valves changes, so stable opening/closing control can be performed. Also,.
During initial drive, the magnetic plate is attracted by an electromagnet, and the magnetic plate is brought into contact with the movable element to initially drive the movable element, making it possible to generate a strong driving force for the intake and exhaust valves. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the drive device of the present invention;
Figure 2 is a view from the II-■ arrow. Note that FIG. 1 shows a cross section taken in the i=I arrow direction in FIG. 2. Incidentally, although the engine is provided with an intake valve and an exhaust valve as described above, the drive device according to the present invention can be applied to both the intake and exhaust valves, so the intake valve will mainly be explained below. 1 is an intake valve made of a ceramic material such as silicon nitride, which is lightweight and has excellent high-temperature strength, or a heat-resistant non-magnetic alloy. The intake valve 1 is rotatably supported on a shaft, and when the intake valve 1 is closed, the umbrella portion of the intake valve 1 is seated on a valve seat (not shown) to close the intake port. A movable element 11 is connected to the shaft end of the intake valve 1. The mover 11 includes a cylindrical magnetic passage 12 and a plurality of secondary coils 1 disposed around the outer peripheral surface of the magnetic passage 12.
It consists of 3. The secondary coil l3 is connected to the magnetic path 1
It is formed by pouring molten aluminum into a groove provided on the outer circumferential surface of 2. The magnetic path 12 is made of a magnetic material in order to increase the magnetic flux density acting on the secondary coil 13, and is formed by radially arranging amorphous thin plates of magnetic metal into a cylindrical shape, for example. However, since the magnetic path 12 serves as a path for magnetic flux from a fixed magnetic pole 22, which will be described later, it must be arranged so that the path for the magnetic flux is ensured.

In addition, in order to prevent the intake valve 1 from falling when the engine is stopped, the mover 11 is moved by a spring 14.
is biased in the closing direction by

A pair of drive rods 2 are disposed on the side surface of the movable element 11 with the movable element 11 in between. The drive unit 2 includes a fixed part 18i22 protruding from a core 21 made of a magnetic material and disposed opposite the secondary coil 13, and a coil 23 wound around each of the fixed magnetic poles. Then, alternating power is supplied from a controller 5 to be described later, and a traveling magnetic field is applied to the secondary coil 13 of the movable element 11.

In addition to the drive section 2, a pair of lower electromagnets 3 are disposed on the side surface of the movable element 11. The lower electromagnet 3 includes a lower magnetic pole 31 that is set a predetermined amount below the upper end surface of the mover 11 when the intake valve 1 is in a closed state, and a lower coil 32 that excites the lower magnetic pole 31. .

A magnetic plate 41 is disposed above the movable element 11 and is attracted to the upper electromagnet 4 when the intake valve 1 is in the seated state. The magnetic plate 41 is attracted by the upper electromagnet 4 and the lower electromagnet 3, and is attracted to both of them. ! It moves back and forth between the magnets, and the lower part'
When the IIM 1 is attracted by the stone 3, it comes into contact with the upper end surface of the movable element 11 and drives the movable element 11 downward. The coil 23, the lower coil 32, and the upper electromagnet 4 are connected to the controller 5.

The controller 5 includes a rotation sensor 51 that detects the engine rotation speed and a position sensor 52 that detects the crank angle.
Detection signals from a load sensor 53 that detects the amount of depression of an accelerator pedal (not shown) are input. The controller 5 includes an input/output interface that controls the input of the detection signal and the supply of power, a ROM that stores programs and various relationship maps in advance, a CPU that executes calculations in accordance with the programs stored in the ROM, and a It consists of a RAM that temporarily stores data, a control memory that controls the flow of signals from the controller 5, etc. Next, the operation of the apparatus of the present invention having the above configuration will be explained.

FIG. 3 is a diagram showing the relationship between valve driving force, driving speed, and lift amount. While the engine is running, the load sensor 53 constantly detects the amount of accelerator pedal depression and the rotation sensor 51 detects the engine rotation speed, and a preset relationship map is used to detect the intake air that corresponds to the depression amount and rotation speed. The opening/closing timing of the valve 10 is calculated. When the crank angle detected by the position sensor 52 reaches the timing between the intake valves 1, the upper electromagnet 4 is de-energized, and the lower electromagnet 3 is energized to attract the magnetic plate 41. Then, since the magnetic plate 41 comes into contact with the mover 11, a strong driving force in the opening direction acts on the intake valve 1 as an initial driving force. Next, alternating power is supplied to the coil 23 to apply a traveling magnetic field to the mover 11 in the opening direction. Then, a current is induced in the secondary coil 13, and the intake valve 1 continues to be driven in the opening direction by the electromagnetic force that the induced current receives from the traveling magnetic field.

When the crank angle has elapsed by a predetermined amount from the opening timing, the traveling speed of the traveling magnetic field is decelerated in order to decelerate the intake valve 1,
The movable element 11 is operated for regeneration. After the intake valve 1 is stopped at the maximum lift position, the direction of movement of the magnetic field is reversed upward, that is, to the idle direction.

The intake valve 1 is driven in the closing direction by the reversed magnetic field, and when the crank angle reaches a point before seating, the advancing speed of the magnetic field is again reduced to perform regenerative operation, and the driving speed of the intake valve 1 in the idle direction is reduced to allow the intake valve 1 to be seated. to reduce the impact of

While the intake valve 1 is being driven to open and close as described above,
Since the magnetic body 41 is attracted to the upper electromagnet 4 again,
When the intake valve 1 is seated, the movable element 11 and the magnetic plate 41 do not collide. The bias force of the spring 14 that holds the intake valve 1 in a closed state is set to be sufficiently small with respect to the electromagnetic force described above.

Although the embodiments have been described in detail above, various different embodiments can be easily constructed without departing from the spirit of the present invention. It is not limited to examples. (Effects of the Invention) As explained above, according to the present invention, a traveling magnetic field is formed by the magnetic poles arranged in parallel on the side surface of the secondary coil surrounding the mover, and a current is induced in the secondary coil. Since the intake and exhaust valves are reciprocated by the electromagnetic force received from the traveling magnetic field, the driving force does not change even if the position of the intake and exhaust valves changes, and therefore stable opening/closing control can be performed. In addition, during the initial drive, the magnetic plate is attracted by an electromagnet, and the magnetic plate is brought into contact with the movable element to initially drive the movable element, so the electromagnetic plate can generate a strong driving force for the intake and exhaust valves. A power pulse drive device can be provided.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a view taken along arrows II-II, and Fig. 3 shows valve driving force,
It is a diagram showing the relationship between drive speed and lift amount. DESCRIPTION OF SYMBOLS 1... Intake valve, 2... Drive part, 3... Lower electromagnet, 4... Upper electromagnet, 5... Controller, 1
DESCRIPTION OF SYMBOLS 1... Mover, 13... Secondary coil, 22... Fixed magnetic pole, 4l... Magnetic plate.

Claims (3)

[Claims] (1) A movable magnetic pole that is connected to the intake and exhaust valves of the engine and can freely reciprocate; a plurality of fixed magnetic poles facing the side surface of the movable magnetic pole and arranged in parallel in the reciprocating direction of the movable magnetic pole; a coil that is installed to form a traveling magnetic field in the reciprocating direction when the intake and exhaust valves are open; a secondary coil that is installed around the side surface of the movable magnetic pole and faces the fixed magnetic pole; and a movable magnetic pole that is movable in the reciprocating direction. a movable magnetic plate facing the end face of the movable magnetic plate, an electromagnet that faces the movable magnetic plate and attracts the movable magnetic plate and brings it into contact with the movable magnetic pole to drive the intake and exhaust valves, and controls the energization state of the coil and the electromagnet. 1. An electromagnetic force valve driving device comprising a control means for opening and closing an intake and exhaust valve. (2) The electromagnetic force valve drive device according to claim (1), wherein the electromagnet is activated when the intake and exhaust valves are initially driven. (3) The electromagnetic force valve driving device according to claim (1), wherein a plurality of the secondary coils are arranged in parallel in the reciprocating direction.